阅读说明：本技术 同步信号周期调整 (Synchronization signal period adjustment ) 是由 厉隽怿 J·塞尚 V·拉加万 于 2020-03-03 设计创作，主要内容包括：描述了用于无线通信的方法、系统和设备。当监测和发送用于链路管理的信令时,可以动态地选择不同的周期,其中相应周期可以是基于设备之间的链路的质量的。例如,第一无线设备可以使用第一监测周期来监测从另一无线设备发送的信号。在确定链路条件已经改变(例如,减少或达到门限)时,第一无线设备可以减少其监测周期(并且增加监测频率),以更频繁地检测由另一无线设备发送的信号。在这样的情况下,另一无线设备同样可以基于链路质量来更频繁地(例如,根据第二周期)发送其测量信号。经调整的监测和传输周期可以为无线设备提供额外的机会来检测来自另一设备的信号。(Methods, systems, and devices for wireless communication are described. When monitoring and sending signaling for link management, different periods may be dynamically selected, where the respective periods may be based on the quality of the link between devices. For example, a first wireless device may monitor a signal transmitted from another wireless device using a first monitoring period. Upon determining that the link condition has changed (e.g., decreased or reached a threshold), the first wireless device may decrease its monitoring period (and increase the monitoring frequency) to more frequently detect signals transmitted by another wireless device. In such a case, the other wireless device may also transmit its measurement signal more frequently (e.g., according to the second periodicity) based on the link quality. The adjusted monitoring and transmission period may provide additional opportunities for the wireless device to detect a signal from another device.)

1. A method for communication at a first device, comprising:

determining a configuration of an actual transmission period and at least one virtual transmission period used by the second device;

selecting a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based at least in part on one or more parameters; and

monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

2. The method of claim 1, wherein the one or more parameters comprise link conditions.

3. The method of claim 2, wherein the link condition comprises an error rate for information transmitted over the communication link.

4. The method of claim 1, further comprising:

determining a link condition of the communication link between the first device and the second device.

5. The method of claim 1, further comprising:

selecting the monitoring period to correspond to the actual transmission period;

determining that a link condition satisfies a threshold; and

adjusting the monitoring period to correspond to the at least one virtual transmission period based at least in part on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period.

6. The method of claim 5, further comprising:

starting a timer based at least in part on adjusting the monitoring period to correspond to the at least one dummy transmission period;

determining that the timer has expired; and

monitoring the one or more measurement signals transmitted from one or more other devices based at least in part on the timer expiring.

7. The method of claim 5, further comprising:

determining that the link condition satisfies a second threshold; and

adjusting the monitoring period to correspond to the actual transmission period based at least in part on the link condition meeting the second threshold.

8. The method of claim 1, further comprising:

determining that the communication link has failed based at least in part on a link condition;

establishing a connection with one or more other devices based at least in part on the failed communication link; and

receiving the one or more measurement signals from the one or more other devices.

9. The method of claim 1, further comprising:

receiving an indication that the second device is transmitting the one or more measurement signals according to the at least one virtual transmission period; and

selecting the monitoring period to correspond to the at least one dummy transmission period based at least in part on the indication.

10. The method of claim 1, further comprising:

selecting the monitoring period to correspond to the at least one dummy transmission period based at least in part on a link condition; and

sending an indication to the second device that the monitoring period corresponds to the at least one dummy transmission period.

11. The method of claim 1, further comprising:

operating in a first monitoring mode associated with the actual transmission period; and

operating in a second monitoring mode associated with the at least one dummy transmission period.

12. The method of claim 1, wherein determining the configuration of the actual transmission period and the at least one virtual transmission period comprises:

receiving an indication of the configuration via radio resource control signaling.

13. A method for communication at a first device, comprising:

determining configurations of an actual transmission period and at least one virtual transmission period;

selecting a transmission period corresponding to the actual transmission period or the at least one virtual transmission period based at least in part on one or more parameters; and

one or more measurement signals are transmitted to the second device over the communication link according to the selected transmission period.

14. The method of claim 13, wherein the one or more parameters comprise link conditions.

15. The method of claim 13, further comprising:

determining a link condition of the communication link between the first device and the second device.

16. The method of claim 13, further comprising:

selecting the transmission period to correspond to the actual transmission period;

determining that a link condition satisfies a threshold; and

adjusting the transmission period to correspond to the at least one virtual transmission period based at least in part on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period.

17. The method of claim 16, further comprising:

starting a timer based at least in part on adjusting the transmission period to correspond to the at least one dummy transmission period;

determining that the timer has expired; and

transmitting an indication to one or more other devices to transmit the one or more measurement signals according to the at least one virtual transmission period.

18. The method of claim 16, further comprising:

determining that the link condition satisfies a second threshold; and

adjusting the transmission period to correspond to the actual transmission period based at least in part on the link condition satisfying the second threshold.

19. The method of claim 13, further comprising:

transmitting, to one or more other devices, an indication to transmit the one or more measurement signals according to the at least one virtual transmission period based at least in part on a link condition.

20. The method of claim 13, further comprising:

transmitting symbol timing information for transmitting the one or more measurement signals to one or more other devices.

21. The method of claim 13, further comprising:

selecting the transmission period to correspond to the at least one virtual transmission period based at least in part on a link condition; and

sending an indication to the second device that the transmission period corresponds to the at least one dummy transmission period.

22. The method of claim 13, further comprising:

receiving an indication that a second device is monitoring the one or more measurement signals according to the at least one virtual transmission period; and

selecting the transmission period to correspond to the at least one dummy transmission period based at least in part on the indication.

23. The method of claim 13, further comprising:

operating in a first transmission mode associated with the actual transmission period; and

operating in a second transmission mode associated with the at least one dummy transmission period.

24. A method for communication at a first device, comprising:

transmitting one or more measurement signals to a first set of one or more devices according to a transmission period;

receiving, from a second device, an indication to adjust the transmission period to at least one virtual transmission period based at least in part on one or more parameters of a communication link between the second device and a second set of one or more devices; and

transmitting the one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period.

25. The method of claim 24, wherein the one or more parameters comprise link conditions.

26. The method of claim 24, further comprising:

receiving a configuration of at least one virtual transmission period used by the second device, the configuration being received prior to the indication from the second device, wherein the at least one virtual transmission period is based at least in part on the configuration.

27. The method of claim 24, further comprising:

determining a configuration of the at least one virtual transmission period.

28. The method of claim 24, further comprising:

receiving symbol timing information from a second device; and

transmitting the one or more measurement signals to the second set of one or more devices based at least in part on the symbol timing information.

29. The method of claim 24, wherein the at least one dummy transmission period is shorter than the transmission period.

30. An apparatus for communication at a first device, comprising:

means for determining a configuration of an actual transmission period and at least one virtual transmission period used by a second device;

means for selecting a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based at least in part on one or more parameters; and

means for monitoring one or more measurement signals transmitted by the second device over a communication link according to the selected monitoring period.

Technical Field

The following generally relates to wireless communications, and more particularly, the following relates to synchronization signal configuration.

Background

Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems are capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems (e.g., Long Term Evolution (LTE) systems, LTE-advanced (LTE-a) systems, or LTE-a professional systems) and fifth generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ techniques such as: code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communication system may include multiple base stations or network access nodes, each supporting communication for multiple communication devices (which may otherwise be referred to as User Equipment (UE)) simultaneously.

Disclosure of Invention

A method of communication at a first device is described. The method may include: a configuration of an actual transmission period and at least one virtual transmission period used by the second device is determined. The method may include: selecting a monitoring period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The method may include: monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

An apparatus for communication at a first device is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to: a configuration of an actual transmission period and at least one virtual transmission period used by the second device is determined. The processor and memory may be configured to: selecting a monitoring period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The processor and memory may be configured to: monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

Another apparatus for communication at a first device is described. The apparatus may include: means for determining a configuration of an actual transmission period and at least one virtual transmission period used by a second device. The apparatus may include: means for selecting a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters. The apparatus may include: means for monitoring one or more measurement signals transmitted by the second device over a communication link according to the selected monitoring period.

A non-transitory computer-readable medium storing code for communication at a first device is described. The code may include instructions executable by a processor to: a configuration of an actual transmission period and at least one virtual transmission period used by the second device is determined. The code may include instructions executable by a processor to: selecting a monitoring period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The code may include instructions executable by a processor to: monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more parameters include a link condition.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the link condition comprises an error rate for information transmitted over the communication link.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining a link condition of the communication link between the first device and the second device.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: the monitoring period is selected to correspond to the actual transmission period. Some examples may also include operations, features, units or instructions to: determining that a link condition satisfies a threshold; and adjusting the monitoring period to correspond to the at least one dummy transmission period based on the link condition satisfying the threshold, the at least one dummy transmission period being shorter than the actual transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: starting a timer based on adjusting the monitoring period to correspond to the at least one dummy transmission period. Some examples may also include operations, features, units or instructions to: determining that the timer may have expired; and monitor the one or more measurement signals transmitted from one or more other devices based on the timer expiring.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining that the link condition satisfies a second threshold; and adjusting the monitoring period to correspond to the actual transmission period based on the link condition satisfying the second threshold.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining that the communication link may have failed based on a link condition; establishing a connection with one or more other devices based on the failed communication link; and receiving the one or more measurement signals from the one or more other devices.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: receiving an indication that the second device may be transmitting the one or more measurement signals according to the at least one virtual transmission period. Some examples may also include operations, features, units or instructions to: selecting the monitoring period to correspond to the at least one dummy transmission period based on the indication.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: selecting the monitoring period to correspond to the at least one dummy transmission period based on a link condition; and sending an indication to the second device that the monitoring period corresponds to the at least one dummy transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: operating in a first monitoring mode associated with the actual transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: operating in a second monitoring mode associated with the at least one dummy transmission period.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the configuration to determine the actual transmission period and the at least one virtual transmission period may include operations, features, units, or instructions to: receiving an indication of the configuration via Radio Resource Control (RRC) signaling.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: receiving the one or more measurement signals from the second device based on the monitoring.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more measurement signals comprise a Synchronization Signal Block (SSB), or a channel state information reference signal (CSI-RS), or a Sounding Reference Signal (SRS), or a combination thereof.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first device comprises a first node in an Integrated Access and Backhaul (IAB) network and the second device comprises a second node in the IAB network.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the communication link includes one or more directional beams operating over a millimeter wave (mmW) radio frequency spectrum band.

A method of communication at a first device is described. The method may include: the configuration of the actual transmission period and the at least one virtual transmission period is determined. The method may include: selecting a transmission period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The method may include: one or more measurement signals are transmitted to the second device over the communication link according to the selected transmission period.

An apparatus for communication at a first device is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to: the configuration of the actual transmission period and the at least one virtual transmission period is determined. The processor and memory may be configured to: selecting a transmission period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The processor and memory may be configured to: one or more measurement signals are transmitted to the second device over the communication link according to the selected transmission period.

Another apparatus for communication at a first device is described. The apparatus may include: means for determining a configuration of an actual transmission period and at least one virtual transmission period. The apparatus may include: means for selecting a transmission period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The apparatus may include: means for transmitting one or more measurement signals to a second device over a communication link according to the selected transmission period.

A non-transitory computer-readable medium storing code for communication at a first device is described. The code may include instructions executable by a processor to: the configuration of the actual transmission period and the at least one virtual transmission period is determined. The code may include instructions executable by a processor to: selecting a transmission period corresponding to the actual transmission period or the at least one dummy transmission period based on one or more parameters. The code may include instructions executable by a processor to: one or more measurement signals are transmitted to the second device over the communication link according to the selected transmission period.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more parameters include a link condition.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining a link condition of the communication link between the first device and the second device.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: selecting the transmission period to correspond to the actual transmission period. Some examples may also include operations, features, units or instructions to: determining that a link condition satisfies a threshold; and adjusting the transmission period to correspond to the at least one dummy transmission period based on the link condition satisfying the threshold, the at least one dummy transmission period being shorter than the actual transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: starting a timer based on adjusting the transmission period to correspond to the at least one dummy transmission period. Some examples may also include operations, features, units or instructions to: determining that the timer may have expired; and transmitting an indication to one or more other devices to transmit the one or more measurement signals according to the at least one virtual transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining that the link condition satisfies a second threshold; and adjusting the transmission period to correspond to the actual transmission period based on the link condition satisfying the second threshold.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: transmitting, to one or more other devices, an indication to transmit the one or more measurement signals according to the at least one virtual transmission period based on link conditions.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: transmitting symbol timing information for transmitting the one or more measurement signals to one or more other devices.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: selecting the transmission period to correspond to the at least one dummy transmission period based on a link condition; and sending an indication to the second device that the transmission period corresponds to the at least one dummy transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: receiving an indication that the second device may be monitoring the one or more measurement signals according to the at least one virtual transmission period. Some examples may also include operations, features, units or instructions to: selecting the transmission period to correspond to the at least one dummy transmission period based on the indication.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: operating in a first transmission mode associated with the actual transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: operating in a second transmission mode associated with the at least one dummy transmission period.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the configuration to send the actual transmission period and the at least one virtual transmission period may include operations, features, units, or instructions to: sending an indication of the configuration via RRC signaling.

A method of communication at a first device is described. The method may include: one or more measurement signals are transmitted to a first set of one or more devices according to a transmission period. The method may include: receiving, from a second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and a second set of one or more devices. The method may include: transmitting the one or more measurement signals to a second set of one or more devices according to the at least one virtual transmission period.

An apparatus for communication at a first device is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to: one or more measurement signals are transmitted to a first set of one or more devices according to a transmission period. The processor and memory may be configured to: receiving, from a second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and a second set of one or more devices. The processor and memory may be configured to: transmitting the one or more measurement signals to a second set of one or more devices according to the at least one virtual transmission period.

Another apparatus for communication at a first device is described. The apparatus may include: means for transmitting one or more measurement signals to a first set of one or more devices according to a transmission period. The apparatus may include: means for receiving, from a second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and a second set of one or more devices. The apparatus may include: means for transmitting the one or more measurement signals to a second set of one or more devices according to the at least one virtual transmission period.

A non-transitory computer-readable medium storing code for communication at a first device is described. The code may include instructions executable by a processor to: one or more measurement signals are transmitted to a first set of one or more devices according to a transmission period. The code may include instructions executable by a processor to: receiving, from a second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and a second set of one or more devices. The code may include instructions executable by a processor to: transmitting the one or more measurement signals to a second set of one or more devices according to the at least one virtual transmission period.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more parameters include a link condition.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: receiving a configuration of at least one virtual transmission period used by the second device, the configuration being received prior to the indication from the second device, wherein the at least one virtual transmission period may be based on the configuration.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining a configuration of the at least one virtual transmission period.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: receiving symbol timing information from a second device; and transmitting the one or more measurement signals to the second set of one or more devices based on the symbol timing information.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the at least one virtual transmission period may be shorter than the transmission period.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first wireless device comprises a first node in an IAB network and the second wireless device comprises a second node in the IAB network.

Drawings

Fig. 1 illustrates an example of a system for wireless communication that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure.

Fig. 2 illustrates an example of a wireless communication system that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure.

Fig. 3 illustrates an example of a transmission/monitoring mode that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure.

Fig. 4 illustrates an example of a process flow in a system that supports synchronization signal period adjustment according to one or more aspects of the present disclosure.

Fig. 5 and 6 illustrate diagrams of devices that support synchronization signal period adjustment according to one or more aspects of the present disclosure.

Fig. 7 illustrates a diagram of a communication manager that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure.

Fig. 8 is a diagram of a system including a UE supporting synchronization signal period adjustment, in accordance with one or more aspects of the present disclosure.

Fig. 9 illustrates a diagram of a system including a base station that supports synchronization signal period adjustment in accordance with one or more aspects of the disclosure.

Fig. 10 through 14 show flow diagrams illustrating methods of supporting synchronization signal period adjustment according to one or more aspects of the present disclosure.

Detailed Description

A wireless communication system may operate in a mmW frequency range (e.g., 28 gigahertz (GHz), 40GHz, etc.). Wireless communication at these frequencies may be associated with increased signal attenuation (e.g., path loss) that may be affected by various factors, such as temperature, barometric pressure, diffraction, blockage, and the like. Thus, signal processing techniques (such as beamforming) can be used to coherently combine the energy and overcome the path loss at these frequencies. Transmissions between wireless devices may be beamformed due to an increased amount of path loss in mmW communication systems. The receiving device may also use beamforming techniques to configure the antennas and/or antenna arrays such that transmissions are received in a directional manner.

Some wireless communication systems may include an access node to facilitate wireless communication between a network and various nodes and devices, such as UEs. Such deployments may use beamformed transmissions within the mmW frequency range for communication between different nodes, which may include access and backhaul communication. For example, a parent node (which may also be referred to as a donor node, anchor node, or other similar term) may have a high capacity wired backhaul connection (e.g., optical fiber) to a core network. The parent node may also communicate (e.g., using directional beams) with one or more other nodes (e.g., relay nodes or devices) and/or UEs, which may be referred to as child nodes. Thus, wireless communication between the parent node and the other device may include backhaul communication, access communication, or a combination thereof. Such systems may be referred to as IAB networks.

In deployments supporting access and backhaul on wireless communication links (e.g., in IAB networks), a child node may rely on signaling (e.g., SSB, CSI-RS, etc.) to obtain beam information from a potential IAB parent node. For example, to acquire beam information, one or more parent nodes may transmit SSBs in a certain time interval, and each SSB may be identified by a unique number called an SSB index. Each SSB may be transmitted via a particular beam radiating in a respective direction, where one or more SSBs may be included within a synchronization signal burst. Other wireless devices (e.g., UEs and other nodes) located near the parent node may measure the signal strength of each SSB detected over a period of time, and the wireless device may identify the SSB index with the strongest signal strength (where the strongest signal strength may correspond to the best beam for the wireless device relative to the other beams used by the parent node). Also, the parent node may rely on signaling (e.g., SRS transmitted in the uplink from the child node for beam management and channel quality estimation).

However, there may be conditions that may cause interference, blockage, etc. of the beam carrying the measurement signal (such as the SSB), which may result in a link failure. Under these conditions, the ability of the child node to receive the SSB may be negatively impacted. For example, if the path between a parent node and a child node is blocked, the child node may not be able to rely on the SSB to reacquire its parent node. Thus, the latency in the network (e.g., for a node to recover from a link failure) may be based on the rate and/or frequency of SSB transmissions. In one example, a node that sends SSBs more frequently may facilitate robust acquisition/reacquisition opportunities for another node or UE. However, there may also be overhead associated with sending SSBs more frequently. Thus, there may be a tradeoff between signaling overhead and system stability and reliability.

As described herein, upon detecting a beam or link failure, the child and parent nodes may dynamically switch to different monitoring and transmission frequency modes, autonomously or synchronously. For example, a child node or a parent node, or a combination thereof, may monitor the link condition of the communication link between the child node and the parent node. In some examples, if one or both of the nodes determine that the link condition has fallen below a predefined threshold (e.g., a decrease due to interference or poor link condition), either or both nodes may attempt to send a signal to the other node indicating a poor link condition. If the other node is able to receive the indication, the two nodes may switch to different modes synchronously, thereby enabling a relatively high signal transmission and monitoring frequency.

Additionally or alternatively, if a node fails to receive an indication (e.g., due to link conditions), the two nodes may autonomously switch to different modes based on link quality. For example, in the first mode, SSB transmission and monitoring may occur at a first periodicity and more frequently than the second mode (e.g., where SSB monitoring and transmission may occur according to a periodicity associated with a link condition greater than a threshold). There may also be any number of different modes that are dynamically selected based on current link conditions. The flexible selection of different periods of signal transmission and corresponding monitoring, which may be dynamically changed according to link conditions, may allow for increased reliability, reduced latency (e.g., in acquiring or reacquiring a parent node), and reduced or minimized signaling overhead in the network.

Aspects of the present disclosure are first described in the context of a wireless communication system. A specific example for synchronization signal period adjustment in an IAB communication network is then described. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts related to synchronization signal period adjustment.

Fig. 1 illustrates an example of a wireless communication system 100 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The wireless communication system 100 includes base stations 105, UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an LTE-a professional network, or an NR network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low cost and low complexity devices. The wireless communication system 100 may support the use of dynamically selected monitoring and transmission periods for measurement signals.

The base station 105 may communicate wirelessly with the UE115 via one or more base station antennas. The base stations 105 described herein may include or may be referred to by those skilled in the art as base station transceivers, wireless base stations, access points, wireless transceivers, node B, eNodeB (eNB), next generation node bs or gigabit node bs (any of which may be referred to as gnbs), home node bs, home evolved node bs, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE115 described herein is capable of communicating with various types of base stations 105 and network devices, including macro enbs, small cell enbs, gnbs, relay base stations, and the like.

Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE115 may utilize one or more carriers. The communication links 125 shown in the wireless communication system 100 may include: uplink transmissions from the UE115 to the base station 105, or downlink transmissions from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

The geographic coverage area 110 for a base station 105 can be divided into sectors that form a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other type of cell, or various combinations thereof. In some examples, the base stations 105 may be mobile and, thus, provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, heterogeneous LTE/LTE-a professional or NR networks, where different types of base stations 105 provide coverage for various geographic coverage areas 110.

The term "cell" refers to a logical communication entity used for communication with the base station 105 (e.g., on a carrier) and may be associated with an identifier (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID)) used to distinguish neighboring cells operating via the same or different carrier. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., Machine Type Communication (MTC), narrowband internet of things (NB-IoT), enhanced mobile broadband (eMBB), or other protocol types) that may provide access for different types of devices. In some cases, the term "cell" may refer to a portion (e.g., a sector) of geographic coverage area 110 over which a logical entity operates.

UEs 115 may be dispersed throughout the wireless communication system 100, and each UE115 may be stationary or mobile. The UE115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a user equipment, or some other suitable terminology, where a "device" may also be referred to as a unit, station, terminal, or client. The UE115 may also be a personal electronic device, such as a cellular telephone, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE115 may also refer to a Wireless Local Loop (WLL) station, an internet of things (IoT) device, an internet of everything (IoE) device, or an MTC device, etc., which may be implemented in various items such as appliances, vehicles, meters, etc.

Some UEs 115 (e.g., MTC or IoT devices) may be low cost or low complexity devices and may provide automated communication between machines (e.g., communication via machine-to-machine (M2M)). M2M communication or MTC may refer to data communication techniques that allow devices to communicate with each other or base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application that may utilize the information or present the information to a human interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, device monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based billing for services.

Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE115 include: a power-saving "deep sleep" mode is entered when not engaged in active communications or operating on a limited bandwidth (e.g., according to narrowband communications). In some cases, the UE115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communication for these functions.

In some cases, the UE115 may also be able to communicate directly with other UEs 115 (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs 115 in the group of UEs 115 communicating with D2D may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, multiple groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1: M) system, where each UE115 transmits to every other UE115 in the group. In some cases, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base stations 105.

The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 over backhaul links 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130) over backhaul links 134 (e.g., via X2, Xn, or other interfaces).

Core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 may be an Evolved Packet Core (EPC) that may include at least one Mobility Management Entity (MME), at least one serving gateway (S-GW), and at least one Packet Data Network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be transported through the S-GW, which may itself be connected to the P-GW. The P-GW may provide IP address assignment as well as other functions. The P-GW may be connected to a network operator IP service. The operator IP services may include access to the internet, intranets, IP Multimedia Subsystem (IMS) or Packet Switched (PS) streaming services.

At least some of the network devices (e.g., base stations 105) may include subcomponents such as access network entities, which may be examples of Access Node Controllers (ANCs). Each access network entity may communicate with the UE115 through a plurality of other access network transport entities, which may be referred to as radio heads, intelligent radio heads, or transmission/reception points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 105).

The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 GHz. Typically, the region from 300MHz to 3GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range is from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by building and environmental features. However, the waves may be sufficient to penetrate the structure for the macro cell to provide service to the UE115 located indoors. UHF-wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100km) than transmission of smaller and longer waves using the High Frequency (HF) or Very High Frequency (VHF) portions of the spectrum below 300 MHz.

The wireless communication system 100 may also operate in the ultra high frequency (SHF) region using a frequency band from 3GHz to 30GHz, also referred to as a centimeter frequency band. The SHF area includes frequency bands such as the 5GHz industrial, scientific, and medical (ISM) band, which may be opportunistically used by devices that can tolerate interference from other users.

The wireless communication system 100 may also operate in the Extremely High Frequency (EHF) region of the spectrum, e.g., from 30GHz to 300GHz (also referred to as the millimeter-band). In some examples, the wireless communication system 100 may support mmW communication between the UE115 and the base station 105, and the EHF antennas of the respective devices may be even smaller and more closely spaced compared to UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the specified use of frequency bands across these frequency regions may differ depending on the country or regulatory agency.

In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE license-exempt (LTE-U) radio access technology, or NR technology in an unlicensed band (e.g., the 5GHz ISM band). When operating in the unlicensed radio frequency spectrum band, wireless devices (e.g., base station 105 and UE115) may employ a Listen Before Talk (LBT) procedure to ensure that the frequency channel is idle before transmitting data. In some cases, operation in the unlicensed band may be based on a carrier aggregation configuration in conjunction with component carriers operating in the licensed band (e.g., LAA). Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on Frequency Division Duplexing (FDD), Time Division Duplexing (TDD), or a combination of both.

In some examples, a base station 105 or UE115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE115), where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Likewise, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

Beamforming (which may also be referred to as spatial filtering, directional transmission or directional reception) is a signal processing technique that: the techniques may be used at a transmitting device or a receiving device (e.g., base station 105 or UE115) to form or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by: signals transmitted via the antenna elements of the antenna array are combined such that signals propagating in a particular orientation relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signal transmitted via the antenna element may comprise: a transmitting device or a receiving device applies certain amplitude and phase offsets to signals carried via each of the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to an antenna array of a transmitting device or a receiving device, or relative to some other orientation).

In one example, the base station 105 may use multiple antennas or antenna arrays for beamforming operations for directional communication with the UE 115. For example, the base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions, which may include signals transmitted according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify beam directions (e.g., by the base station 105 or a receiving device (e.g., UE 115)) for subsequent transmission and/or reception by the base station 105.

The base station 105 may transmit some signals (e.g., data signals associated with a particular receiving device) in a single beam direction (e.g., a direction associated with the receiving device (e.g., UE 115)). In some examples, a beam direction associated with a transmission along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, the UE115 may receive one or more of the signals transmitted in different directions by the base station 105, and the UE115 may report an indication to the base station 105 of the signal received by the UE115 having the highest signal quality or otherwise acceptable signal quality. Although the techniques are described with reference to signals transmitted by the base station 105 in one or more directions, the UE115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmission or reception by the UE115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

When receiving various signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, a receiving device (e.g., UE115, which may be an example of a mmW receiving device) may attempt multiple receive beams. For example, a receiving device may attempt multiple receive directions by receiving via different antenna sub-arrays, by processing received signals according to different antenna sub-arrays, by receiving according to different sets of receive beamforming weights applied to signals received at a set of antenna elements of an antenna array, or by processing received signals according to different sets of receive beamforming weights applied to signals received at a set of antenna elements of an antenna array (any of the above operations may be referred to as "listening" according to different receive beams or receive directions). In some examples, a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving data signals). A single receive beam may be aligned in a beam direction determined based on listening from different receive beam directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio, or otherwise acceptable signal quality based on listening from multiple beam directions).

In some cases, the antennas of a base station 105 or UE115 may be located within one or more antenna arrays that may support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with the base station 105 may be located at different geographic locations. The base station 105 may have an antenna array with multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UEs 115. Likewise, the UE115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

In some cases, the wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. A Medium Access Control (MAC) layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also use hybrid automatic repeat request (HARQ) to provide retransmissions at the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer may provide for establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE115 and the base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

In some cases, the UE115 and the base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood that data will be received correctly on the communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), Forward Error Correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer under poor radio conditions (e.g., signal-to-noise conditions). In some cases, a wireless device may support same slot HARQ feedback, where the device may provide HARQ feedback in a particular slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

May be in basic time units (which may, for example, refer to T)_sA sampling period of 1/30,720,000 seconds) to represent the time interval in LTE or NR. The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be denoted as T_f＝307,200T_s. The radio frames may be identified by a System Frame Number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may also be divided into 2 slots, each having a duration of 0.5ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix added in front of each symbol period). The cyclic prefix is excluded from the list of cyclic prefixes,each symbol period may contain 2048 sample periods. In some cases, a subframe may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a Transmission Time Interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of shortened ttis (sTTI) or in a selected component carrier using sTTI).

In some wireless communication systems, a slot may be further divided into a plurality of minislots comprising one or more symbols. In some examples, the symbol of the micro-slot or the micro-slot may be a minimum scheduling unit. Each symbol may vary in duration depending on, for example, the subcarrier spacing or frequency band of operation. Further, some wireless communication systems may implement timeslot aggregation, where multiple timeslots or minislots are aggregated together and used for communication between the UE115 and the base station 105.

The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over the communication link 125. For example, the carrier of the communication link 125 may include a portion of the radio frequency spectrum band that operates according to physical layer channels for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. The carriers may be associated with predefined frequency channels (e.g., evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel numbers (EARFCNs)) and may be placed according to a channel grid for discovery by UEs 115. The carriers may be downlink or uplink (e.g., in FDD mode), or may be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, the signal waveform transmitted on a carrier may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or discrete fourier transform spread OFDM (DFT-S-OFDM)).

The organization of carriers may be different for different radio access technologies (e.g., LTE-A, LTE-a specialty, NR). For example, communications over carriers may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding of the user data. The carriers may also include dedicated acquisition signaling (e.g., synchronization signals or system information) and control signaling that coordinates operation for the carriers. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.

The physical channels may be multiplexed on the carriers according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using Time Division Multiplexing (TDM) techniques, Frequency Division Multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, the control information sent in the physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

The carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or "system bandwidth" of the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80MHz) of the carrier for the particular wireless access technology. In some examples, each served UE115 may be configured to operate over part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured for operation using a narrowband protocol type associated with a predefined portion or range within a carrier (e.g., a set of subcarriers or RBs) (e.g., "in-band" deployment of narrowband protocol types).

In a system employing MCM technology, a resource element may consist of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements the UE115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and the use of multiple spatial layers may further increase the data rate for communication with the UE 115.

Devices of the wireless communication system 100 (e.g., base stations 105 or UEs 115) may have a hardware configuration that supports communication over a particular carrier bandwidth or may be configurable to support communication over one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and/or a UE115 capable of supporting simultaneous communication via carriers associated with more than one different carrier bandwidth.

The wireless communication system 100 may support communication with UEs 115 over multiple cells or carriers (a feature that may be referred to as carrier aggregation or multi-carrier operation). According to a carrier aggregation configuration, a UE115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both FDD and TDD component carriers.

In some cases, the wireless communication system 100 may utilize an enhanced component carrier (eCC). An eCC may be characterized by one or more features including: a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be used by UEs 115 that may not be able to monitor the entire carrier bandwidth or otherwise be configured to use a limited carrier bandwidth (e.g., to save power).

In some cases, an eCC may utilize a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of the other component carriers. Shorter symbol durations may be associated with increased spacing between adjacent subcarriers. A device utilizing an eCC (e.g., UE115 or base station 105) may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20, 40, 60, 80MHz) with a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may consist of one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

In addition, the wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed frequency spectrum bands. Flexibility in eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple frequency spectrums. In some examples, NR sharing spectrum may improve spectrum utilization and spectral efficiency, particularly through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.

The wireless communication system 100 may include access nodes to facilitate wireless communication between various wireless devices, such as UEs 115 and other access nodes or base stations 105, and a core network 130. For example, an anchor access node (or parent node) may have a high capacity wired (e.g., fiber optic) backhaul connection to a network while communicating with one or more other access nodes (e.g., base station 105, relay device, UE115), which may be referred to as child nodes. Due to various conditions, a channel (or path) between communication devices may experience interference, blockage, etc., such that wireless communication may degrade or fail. Such conditions may include adverse weather, temperature, atmospheric pressure, diffraction, physical objects, and the like. These conditions may affect the ability of parent and child nodes to communicate over a channel.

However, as described herein, various wireless devices within the wireless communication system 100 may use various techniques to select different periods to monitor signaling sent by another wireless device, which may be based on the quality of the link between the devices. For example, a first wireless device (e.g., UE115 or base station 105) may monitor for a signal transmitted from another wireless device using a particular monitoring period based on current link conditions. Upon determining that the link quality has changed (e.g., decreased or reached a threshold), the first wireless device may decrease its monitoring period (e.g., increase the monitoring frequency) in an attempt to detect a signal transmitted by another wireless device. Furthermore, another wireless device may also decrease the transmission period of its measurement signal (e.g., SSB) due to the changed link quality (and increase the transmission frequency of the measurement signal) in an attempt to assist the wireless device in detecting the transmitted signal. Thus, the increased monitoring and transmission periods may provide additional opportunities for the wireless device to identify signals (e.g., measurement reports, beam management) that facilitate an efficient and stable communication link under various conditions. Additionally, if the condition of the link improves, the wireless device may select a different transmission and monitoring period commensurate with the current link condition (e.g., select a lower frequency if the link quality is above a minimum threshold).

One or more of the UEs 115 may include a communication manager 101 that may determine a configuration of actual transmission periods and at least one virtual transmission period used by a parent node. In some cases, the communication manager 101 may determine a link condition of a communication link between a child node and a parent node. The communication manager 101 may select a monitoring period corresponding to the actual transmission period or the virtual transmission period based on one or more parameters, and monitor the measurement signal transmitted by the parent node on the communication link according to the selected monitoring period. In some cases, the one or more parameters include a link condition.

One or more of the base stations 105 may include a communications manager 101 that may determine a configuration of actual transmission periods and virtual transmission periods. In some cases, the communication manager 101 may determine a link condition of a communication link between a parent node and a child node. The communication manager 101 may select a transmission period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters, and transmit the measurement signal to the child node on the communication link according to the selected transmission period. In some cases, the one or more parameters include a link condition.

The parent node may also communicate with nearby nodes (e.g., neighboring nodes). The neighboring node may also include a communication manager 101 that may transmit a measurement signal to a wireless device (e.g., a child node, a parent node, or a combination thereof) according to a transmission period, receive an indication from the parent node to adjust the transmission period to a virtual transmission period based on one or more parameters of a communication link between the parent node and the wireless device, and transmit the measurement signal to the wireless device according to the virtual transmission period. In some cases, the one or more parameters include a link condition.

Fig. 2 illustrates an example of a wireless communication system 200 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The wireless communication system 200, which may be an example of an NR system that supports mmW communication, may supplement a wired backhaul connection (e.g., the wired backhaul link 220) by sharing infrastructure and spectrum resources for network access with wireless backhaul link capabilities, thereby providing an IAB network architecture. The wireless communication system 200 may include a core network 205 and base stations 105 or supported devices that are split into one or more supporting entities (i.e., functions) to coordinate communication access to improve wireless backhaul density. Aspects of the support functionality of the base station 105 may be referred to as IAB nodes, such as IAB donor node 210 and IAB relay node 215. The wireless communication system 200 may additionally support multiple UEs 115 that may communicate on the uplink with one or more IAB donor nodes 210, IAB relay nodes 215, or a combination of these devices. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100.

The wireless communication system 200 may include one or more IAB donor nodes 210 that may interface between a wired network and a wireless network. In some cases, the IAB donor node 210 may be referred to as an anchor node because the IAB donor node 210 anchors the wireless network to a wired connection. For example, each IAB donor node 210 can include at least one wired backhaul link 220 and one or more additional links (e.g., wireless backhaul link 225, backup wireless backhaul link 230, access link 235). The IAB donor node 210 may be split into associated base station Centralized Units (CUs) and Distributed Unit (DU) entities, where one or more DUs associated with the IAB donor node 210 may be controlled in part by the associated CUs. CUs of the IAB donor node 210 may mandate layer 3(L3) (e.g., RRC, Service Data Adaptation Protocol (SDAP), PDCP) functions and signaling. Further, the CUs of the IAB donor node 210 may communicate with the core network 205 over a wired backhaul link 220 (which may be referred to as an NG interface, for example). The DU may host lower layer operations such as layer 1(L1) and/or layer 2(L2) (e.g., RLC, MAC, Physical (PHY) layer) functions and signaling. The DU entity of the IAB donor node 210 can support the serving cell within the network coverage area according to the connections associated with the wireless backhaul link 225 and the access link 235 of the IAB network. The DUs of the IAB donor node 210 can control access and backhaul links within the corresponding network coverage, and can provide control and scheduling for the subsequent (i.e., child) IAB relay node 215 and/or the UE 115. For example, the DUs can support RLC channel connections with the UE115 (e.g., via the access link 235) or with the IAB relay node 215 (e.g., via a backhaul link, such as the primary wireless backhaul link 225 or the backup wireless backhaul link 230).

The IAB relay node 215 may be split into associated Mobile Terminal (MT) and base station DU entities, where the MT functionality of the IAB relay node 215 may be controlled and/or scheduled by a previous-level (i.e., parent) IAB node via a wireless backhaul link. The parent node of the relay node 215 may be another (previous stage) relay node 215 or the IAB donor node 210. The MT functionality may be similar to that performed by UEs 115 in the system. The IAB relay node 215 may not be directly connected to the wired backhaul 220. Alternatively, the IAB relay node 215 may be connected to the core network 205 via other IAB nodes (e.g., any number of additional IAB relay nodes 215 and IAB donor nodes 210) using wireless backhaul links. The IAB relay node 215 may use the MT functionality to transmit upstream (e.g., to the core network 205) in the IAB system. In some cases, the DUs of the IAB relay node 215 may be controlled in part by signaling messages (e.g., sent via the F1 Application Protocol (AP)) from the CU entities of the associated IAB donor node 210. The DU of the IAB relay node 215 may support the serving cell of the network coverage area. For example, the DU of the IAB relay node 215 may perform the same or similar functions as the DU of the IAB donor node 210, support one or more access links 235 for the UE115, one or more wireless backhaul links for the downstream IAB relay node 215, or both.

The wireless communication system 200 can employ relay chains for communication within the IAB network architecture. For example, the UE115 may communicate with IAB nodes, and the IAB nodes may relay data to the base station CU or the core network 205 directly or via one or more IAB relay nodes 215. Each IAB relay node 215 may include a primary wireless backhaul link 225 for relaying data upstream and/or receiving information from the base station CU or the core network 205. In some cases, the IAB relay node 215 may additionally include one or more backup wireless backhaul links 230 (e.g., for redundant connections and/or improved robustness). If the primary wireless backhaul link 225 fails (e.g., due to interference, failure to connect at the IAB node, movement of the IAB node, maintenance at the IAB node), the IAB relay node 215 may utilize the backup wireless backhaul link 230 for backhaul communication within the IAB network.

The first (e.g., primary) wireless backhaul link 225 may be associated with a coverage area, and MT functionality may be controlled and/or scheduled by a first parent node. One or more secondary backhaul links (e.g., backup wireless backhaul links 230) may be associated with a non-collocated coverage area and controlled and/or scheduled by one or more parent nodes. Each of the primary backhaul connection and the one or more secondary connections may support spectrum capabilities to provide network communications over one or more RATs. One or more IAB nodes may also support base station DU entities and may support multiple backhaul and access links within a relay chain. The DU entities may control and/or schedule the UE115 and the subsequent IAB relay node 215 within the IAB network (e.g., downstream in the IAB network) via configured backhaul and access links. That is, the IAB relay node 215 may act as a relay between the IAB donor node 210 and one or more subsequent devices (e.g., other IAB relay nodes 215, the UE115) in both communication directions based on the established backhaul and access connections. It should be noted that, based on the system architecture, the various devices in the wireless communication system 200 may act as parent nodes, child nodes, or both, and these roles may change dynamically for each device.

In some cases, a wireless device (e.g., an IAB node) may operate in one or more path loss modes, such as a high path loss mode (in which a path loss value meets (or exceeds) a threshold path loss value) or a normal (e.g., low) path loss mode (in which a path loss value is below a threshold path loss value). For example, one or more wireless devices may perform wireless communications in the wireless communication system 200 over a radio frequency spectrum band. In some aspects, this may include the wireless device operating in a first path loss mode (e.g., a low path loss mode or a normal mode) in the wireless communication system 200.

The wireless device may receive a signal indicating that the path loss value has met (or exceeded) the threshold path loss value. As one example, a wireless device may monitor a channel of a radio frequency spectrum band (e.g., monitor a signal transmitted on the channel) and determine that a path loss value has met (or exceeded) a threshold path loss value. In another example, a wireless device may receive a signal from another wireless device indicating that a path loss value has met (or exceeded) a threshold path loss value. Accordingly, the wireless device may switch from the first path loss mode (e.g., low path loss mode) to the second path loss mode (e.g., high path loss mode) and continue to perform wireless communications. The second path loss mode (e.g., the high path loss mode) may include one or more parameters to support continuous wireless communication in a high path loss environment. Examples of parameters that may be adjusted may include, but are not limited to, longer length of SSBs in high path loss mode, longer length of reference signals in high path loss mode, lower Modulation and Coding Scheme (MCS) in high path loss mode, and so forth. Accordingly, the wireless device may continue to perform wireless communications in the wireless communication system 200 in a high path loss environment according to the second path loss mode (e.g., the high path loss mode).

The UE115 or relay node 215 may rely on the SSB to obtain beam information from a current or potential parent node, such as the donor node 210 or relay node 215. The SSB may consist of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and/or broadcast information (e.g., a Physical Broadcast Channel (PBCH)). To acquire beam information, one or more parent nodes may transmit multiple SSBs in a certain time interval (e.g., over wireless backhaul link 225 or over access link 235), and each SSB may be identified by a unique number referred to as an SSB index. Each SSB may be transmitted via a particular beam radiating in a particular direction, where one or more SSBs may be included within a synchronization signal burst. Other wireless devices (e.g., UE115 and other nodes) located around the parent node may measure the signal strength of each SSB detected over a certain period of time, and the wireless device may identify the SSB index with the strongest signal strength (where the strongest signal strength may correspond to the most ideal beam for the wireless device relative to other beams used by the parent node).

In some cases, the access link 235 (e.g., between the donor node 210, the relay node 215, the UE115, or a combination thereof) or the wireless backhaul link 225 carrying the SSB may be negatively impacted due to interference, blocking, or the like. In these cases, the ability of the UE115 or relay node 215 to receive the SSB transmission may be impacted, which may result in latency in the network, increased overhead, and reduced network reliability. Accordingly, the relay node 215, the UE115, the donor node 210, or a combination thereof may monitor the access link 235 condition (or the wireless backhaul link 225 condition) between itself and another node or UE 115. If any of the nodes determine that the link condition has fallen below a threshold (e.g., a predetermined threshold), any or all of the nodes may attempt to signal a poor link condition to other nodes or the UE 115. If other nodes or the UE115 are able to receive the indication, the nodes may synchronously switch to a different mode. If other nodes or the UE115 cannot receive the indication, the node may autonomously switch to a different mode. For example, SSB transmission and monitoring may occur more frequently in different modes. There may also be any number of different modes that may be dynamically selected based on current link conditions. The increased frequency of SSB transmissions, which may be dynamically changed according to link conditions, may allow for increased reliability in the network, may reduce latency, and may minimize overhead.

Fig. 3 illustrates an example of a transmission/monitoring pattern 300 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. In some examples, the transmission/monitoring mode 300 may implement aspects of the wireless communication system 100. The transmission/monitoring mode 300 includes a first frequency mode 305 and a second frequency mode 310. Each frequency pattern 305 and 310 may include a plurality of virtual instances 315 and actual instances 320, which may correspond to transmissions of SSBs 325 (e.g., during a TTI). A virtual transmission cycle may refer to a time period between virtual instances 315 of a signal, and an actual transmission cycle may refer to a time period between actual instances 320 of a signal.

In some cases, the first frequency pattern 305 may correspond to a first transmission/monitoring period 330-a (e.g., according to an actual transmission period), and the second frequency pattern 310 may correspond to a second transmission/monitoring period 330-b (e.g., according to a virtual transmission period), the second transmission/monitoring period 330-b being shorter (e.g., higher frequency) than the first transmission/monitoring period 330-a. As shown, the dummy transmission period may have a higher frequency than the actual transmission period. However, virtual instance 315 and actual instance 320, as well as the virtual cycles and actual cycles, may differ from that shown.

As depicted in fig. 2, the first frequency pattern 305 and the second frequency pattern 310 may be examples of patterns that implement different periods for communication in the IAB network between the donor node 210, the relay node 215, the UE115, or a combination thereof. As described herein, the donor node 210 may be referred to as a parent node, and the relay node 215 may be referred to as a child node. In some cases, nodes in the IAB network and UE115 may rely on SSB 325 sent from a current or potential parent node to obtain beam information. However, these nodes may experience congestion, interference, or a combination thereof, which may inhibit the nodes from reliably receiving SSB 325.

In these cases, the frequency at which SSBs 325 are transmitted and monitored may be a dynamic parameter such that SSBs 325 may be sent more frequently when the connection between the child and parent nodes is poor. Similarly, when the connection is not affected by interference, or when the connection quality returns to a certain threshold, the SSB 325 transmission frequency may be reduced to the base level or first frequency mode 35. There may be several different SSB 325 transmission frequencies that may be implemented under various network conditions. For example, under non-adverse conditions SSB 325 may transmit at a low frequency or not transmit at all, while under slightly adverse conditions SSB 325 may transmit at a slightly higher frequency, and under extremely adverse conditions SSB 325 may transmit at a higher frequency. Different thresholds for various levels of adverse conditions may be preconfigured and paired with different SSB 325 transmission frequencies.

The frequency adjustment from the first frequency pattern 305 to the second frequency pattern 310 (and back to the first frequency pattern 305) may be dynamic such that there may be any number of patterns for adjusting the link conditions and detected errors that are present. For example, the first frequency pattern 305 may be a lower frequency pattern that may be used when less adverse conditions exist (e.g., utilizing a first transmission/monitoring period 330-a), and the second frequency pattern 310 may be a higher frequency pattern that may be used when strongly adverse conditions exist (e.g., utilizing a second transmission/monitoring period 330-b that is shorter than the first transmission/monitoring period 330-a). There may also be any number of patterns between the first frequency and the second frequency to be used depending on the current conditions of the connection between the parent node and the child node. Similarly, the wireless device may transmit and/or monitor signals (e.g., using a corresponding mode) in each virtual instance 315. In some cases, the child and parent nodes may also use signaling other than SSB 325, such as CSI-RS, as one example. In some cases, a child node may transmit SRS or other signaling (and its corresponding periodicity 330) on the uplink to a parent node according to the first frequency pattern or the second frequency pattern.

In some implementations, the parent and child nodes may agree on the timing and frequency of the real instance 320 and virtual instance 315. The real instance 320 may correspond to resources allocated for transmission and reception of data signaling and may occur less frequently than the virtual instance 315 under adverse conditions, the virtual instance 315 may be resources allocated for transmission and reception of SSBs. In some cases, the protocol may be extended to other nodes in the network or to the UE 115. The protocol may be achieved when establishing a connection between a child node and a parent node, and may be exchanged based on capabilities or monitoring requirements between the nodes, or there may be a particular configuration supported by both nodes known prior to enabling the high path loss mode. Under non-adverse conditions, the parent node may transmit in the actual instance 320, and the child node may monitor the actual instance 320. If the parent node detects poor link quality, the parent node may switch to transmitting in the actual instance 320, with virtual instance 315 occurring more frequently than actual instance 320. If the child node detects poor link quality, the child node may switch to monitoring the virtual instance 315.

A child or parent node may detect a beam or link failure. The detection may be based on an error rate, lack of reception Acknowledgement (ACK) (or increased reception of Negative Acknowledgement (NACK)), measurement performed based on SSB to determine radio link failure, low Reference Signal Received Power (RSRP), failure to decode the channel due to signal quality, lower than expected signal-to-interference-plus-noise ratio (SINR) or signal-to-noise ratio (SNR), etc. In one example, the parent node may receive a large number of NACKs from the child node, indicating that there may be a poor connection between the child node and the parent node. In some cases, there may be a predetermined threshold for the number of NACKs that the parent node may receive before changing the SSB 325 transmission frequency. Similarly, there may be a threshold for the number of NACKs sent by the child node before the child node switches to the second frequency pattern 310.

In another example, between SSBs 325, a child node and a parent node may send and receive data during an actual instance 320, and both nodes may measure error rates during the actual instance 320. One or both of the nodes may conclude that the error rate has exceeded a predetermined range and may conclude that there is poor link quality. Upon detecting a beam or link failure, the node may switch to a different SSB frequency mode. In some implementations, the node that first detects the poor connection may send a signal to another node indicating that there is a poor connection, that the node is switching modes, or a combination thereof. For example, a parent node may send data to a child node, and the child node may identify that a link is problematic and adjust the monitoring period. Thus, a child node may send one or more NACKs to a parent node. Parent node may also transition to a higher frequency mode for transmitting SSB 325 if the parent node is capable of receiving one or more NACKs.

In other cases, the parent node may detect poor link quality before the child node. The parent node may indicate to the child node that the parent node is switching modes. The parent node may then switch modes and send SSB 325 more frequently. In some cases, the parent node may switch modes without sending an indication to the child node. The child node may switch modes when receiving SSB 325 at a higher frequency, when receiving an indication from the parent node that the parent node is switching modes, or a combination thereof. In some cases, a child node may monitor each virtual instance 315 and actual instance 320 independently of the mode in which the parent node is located. In some cases, a parent node may only send SSB 325 when poor link conditions exist between the parent and child nodes.

In some examples, the child node may not receive a transmission from the parent node, or may identify that the link quality is poor, switch its monitoring period 330, and stop sending ACKs and NACKs. In this case, the child node may be monitoring at a high frequency (e.g., using the second transmission/monitoring period 330-b) and the parent node may be transmitting at the first frequency mode 305 (e.g., using the first transmission/monitoring period 330-a). During a period of time, the child and parent node modes may not be synchronized such that one node is in the first frequency mode 305 while the other node is in the higher or second frequency mode 310. For example, the child node may switch to the second frequency mode 310 and may not receive the SSB 325 that the child node is expecting within the timeframe because the parent node has not switched modes and/or cycles.

In some cases, the child node may utilize a timer that is started when the child node switches to the second frequency mode 310. While the timer is running, the child node may continue to monitor the SSB 325 from the parent node to account for the time that the parent node implementation may take for poor link quality and handover patterns. There may also be a timer utilized by the parent node such that if the parent node does not receive an ACK or NACK from a child node within a certain period of time, the parent node may switch to the second frequency pattern 310 upon expiration of the timer. Mode switching at a parent or child node may be autonomous if the detection of poor link quality is not synchronized between nodes, e.g., as in the previously described case. The parent node and the child node may also autonomously or synchronously switch back to the first frequency mode 305 when the link quality recovers. In any case, the flexibility of switching between transmission and monitoring periods for the various nodes may take into account various conditions that may be experienced by the communication link, thereby enabling synchronous and asynchronous behavior, while also facilitating fast or delayed switching that may be dynamically based on link conditions.

In some implementations, all beams between the parent node and the child node may be blocked. In this case, the parent node may instruct one or more other IAB nodes (e.g., neighboring nodes) in the vicinity of the parent node to increase its SSB transmission frequency. The parent node may send the indication immediately after switching modes, after a certain number of attempts to communicate with the child node, upon satisfaction of a link condition threshold, after an amount of time after detection of poor link quality, or a combination thereof. The parent node may also signal neighboring nodes whether the parent node has the ability to send SSBs 325 at a higher frequency. For example, the parent node may not have sufficient resources available to accommodate the higher transmission frequency.

In some cases, a child node can monitor SSB 325 transmissions from multiple nodes and can receive SSBs 325 from its parent node, a neighboring node, or a combination thereof. If a child node receives SSB 325 from a node that is not its parent and does not receive SSB 325 from a parent, the child node may switch to an adjacent node. If a child node receives SSB 325 from both the parent and neighboring nodes, the child node may continue to communicate with the parent node or may switch to the neighboring node. The neighboring nodes that may be instructed to switch transmission frequencies and different transmission frequency rates may be pre-configured or may be determined on demand. By increasing the frequency of signals transmitted by neighboring nodes, a child node can receive beam management signaling (or other signaling) even in the event of a reduced link quality or a link failure with a parent node, thereby enabling robust communication within the system.

In some examples, the timing information may also be transmitted to one or more neighboring nodes, for example, when the quality of the communication link between the parent node and the child node degrades or fails. For example, while parent and child nodes are capable of communicating over a communication link and receiving SSB 325 (e.g., with varying periodicity 330 as described herein), both parent and child nodes may operate using synchronous communication. More specifically, when monitoring for signals from a parent node, a child node may know when the parent node transmits signals (and vice versa). However, if the condition of the communication link degrades, synchronization between the nodes may be lost. Thus, a parent node may transmit timing information (e.g., symbol timing information) to one or more neighboring nodes for communication with a child node. As described above, the neighboring node may receive a request for transmission of a measurement signal from the parent node, and may also be provided with symbol timing information from the parent node. Therefore, the neighbor node may transmit a measurement signal to the child node according to the symbol timing information, and the child node may monitor the measurement signal using the same symbol timing. That is, the parent node may provide its symbol timing information to the neighboring nodes so that the neighboring nodes may transmit signals at or near the symbol times that the child nodes will monitor for signals, thereby enabling continuous synchronous communication.

Fig. 4 illustrates an example of a process flow 400 in a system that supports synchronization signal period adjustment according to one or more aspects of the present disclosure. In some examples, process flow 400 may implement aspects of wireless communication systems 100 and 200. For example, devices 405-a, 405-b, and 405-c may be examples of wireless devices in an IAB network. Thus, the device 405 may be an example of a node, UE115, base station 105, or similar device as described with reference to fig. 1 and 2. Alternative examples may be implemented in which some operations may be performed in a different order than described, or not performed at all. In some cases, the operations may include other functions not mentioned below, or additional operations may be added.

At 410, the device 405-a may determine a configuration of a transmission period. The transmission period may include an actual transmission period and at least one dummy transmission period used by the device 405-b. At 415, the device 405-b may determine a configuration of a transmission period. Accordingly, the transmission period may include an actual transmission period and at least one dummy transmission period. As described herein, the actual transmission period may correspond to a first period of the signal, and the dummy transmission period may correspond to a second period that is shorter (i.e., more frequent) than the first period. The device 405-a or 405-b may agree on the timing and frequency of the actual and virtual periods. The protocol may be extended to other devices in the network or to the UE 115. In some examples, the identification of the period may be made when establishing a connection between device 405-a and device 405-b, and may be exchanged based on capabilities or monitoring requirements between the devices. Additionally or alternatively, there may be specific configurations, known or predetermined, supported by both devices.

At 418, the device 405-a and the device 405-b may exchange signals to determine the link quality between the devices. For example, the link quality may be determined by RSRP, RSRQ, SINR, other measurements, or a combination thereof. In some cases, at 420, the device 405-a may determine a link condition of a communication link between the device 405-a and the device 405-b, which may be based on the signaling at 418. In some cases, similarly, at 425, the device 405-b may determine a link condition of a communication link between the device 405-a and the device 405-b.

At 430, the device 405-a may select a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters. Similarly, at 435, the device 405-b may select a transmission period corresponding to an actual transmission period or at least one virtual transmission period based on one or more parameters. In some cases, the one or more parameters include a link condition. In one example, one or both of the devices may determine that the link condition is poor, and the device 405-a may select a monitoring period corresponding to at least one virtual transmission period, and the device 405-b may select a transmission period corresponding to at least one virtual transmission period. In such a case, device 405-a and device 405-b may detect a beam or link failure at similar or different times. The detection of link quality and the adjustment of periodicity may be based on error rate, lack of reception of ACKs (or increased reception of NACKs), measurements performed based on SSBs to determine radio link failure, low RSRP, failure to decode the channel due to signal quality, lower than expected SINR or SNR, etc.

In another example, one or both of the devices may determine that link conditions are favorable, and the devices may select a monitoring and transmission period that corresponds to the actual transmission period. The selection of the monitoring and transmission periods may be performed by the devices 405-a and 405-b in a synchronized manner such that the selection is determined based on both devices and occurs simultaneously. The selection may also be made in an autonomous manner, such that the devices perform the selection without regard to the other devices, wherein the selection of the two devices may be performed at different times.

At 440, the device 405-a may monitor one or more measurement signals transmitted by the device 405-b, 405-c, or a combination thereof, over the communication link according to the selected monitoring period. For example, at 445, device 405-b may transmit a measurement signal to device 405-a over the communication link according to a selected transmission period, which may be based on current link conditions between devices 405-a and 405-b. In one example, if devices 405-a and 405-b are able to synchronously detect poor link conditions, device 405-a may monitor at a period that matches the transmission period of device 405-b. In another example, devices 405-a and 405-b do not coordinate due to adverse conditions, and device 405-a may monitor at a different period than the period in which device 405-b transmits. Device 405-b may be transmitting for a period less than, matching, or greater than the period that device 405-a is monitoring.

In some cases, all beams between device 405-a and device 405-b may be blocked, resulting in an overall link failure. In this case, device 405-b may instruct other nodes (e.g., device 405-c) in the vicinity of device 405-b to increase its transmission frequency. In such a case, at 450, the device 405-c may receive an indication from the device 405-b to adjust the transmission period to at least one virtual transmission period based on a link condition of a communication link between the device 405-a and the device 405-b. The device 405-b may send the indication immediately after switching modes, after a certain number of attempts to communicate with the device 405-a, or after a certain amount of time after detecting poor link quality, or a combination thereof. The device 405-b may also signal neighboring nodes whether the device 405-b has the capability to transmit at a higher frequency. For example, the device 405-b may not have sufficient resources available to accommodate the higher transmission frequency.

Additionally or alternatively, device 405-b may determine a priority of data to be transmitted to various nodes and devices within the system, and device 405-b may determine that measurement signals to device 405-a may have a lower priority. Thus, the device 405-b may avoid modifying its transmission period of the measurement signal based on other higher priority transmissions. Thus, the device 405-b may signal the device 405-c to adjust the transmission period of the device 405-c. The device 405-b may also include symbol timing information in the adjustment indication 450 to the device 405-c. For example, the symbol timing information may be timing information corresponding to the synchronous clocks of device 405-b and device 405-a. In the event of a failure of one or more links between device 405-a and device 405-b, there may be a period of time before the respective clocks at the two devices deviate from synchronization (e.g., due to lack of synchronization information or other signaling between the devices). Thus, the timing information provided by device 405-b to device 405-c may enable device 405-c to determine the timing of measurement signals desired by device 405-a.

At 455, device 405-c may transmit a measurement signal to device 405-a according to at least one virtual transmission period. In some cases, device 405-c may utilize symbol timing information provided by device 405-b to transmit a measurement signal during or near the symbol time that device 405-a will monitor for the measurement signal. In some cases, device 405-a can monitor transmissions from multiple nodes (e.g., device 405-b and device 405-c) and can receive transmissions from device 405-b, device 405-c, or a combination thereof. If device 405-a receives a transmission from device 405-c but does not receive a transmission from device 405-b, device 405-a can switch to the non-blocked device 405-c. If device 405-a receives a transmission from both devices 405-b and 405-c, device 405-a may continue to communicate with device 405-b or may switch to device 405-c. Devices that may be instructed to switch transmission frequencies and different transmission frequency rates, such as device 405-c, may be pre-configured or may be determined on demand.

Fig. 5 illustrates a diagram 500 of a device 505 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. Device 505 may be an example of aspects of a wireless device (such as UE115, base station 105, or access node) as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to synchronization signal period adjustment). Information may be passed to other components of the device 505. The receiver 510 may be an example of aspects of the transceiver 820 or 920 described with reference to fig. 8 and 9. Receiver 510 may utilize a single antenna or a group of antennas.

The communication manager 515 may perform the following operations: determining a configuration of an actual transmission period and at least one virtual transmission period used by the second device; selecting a monitoring period corresponding to an actual transmission period or at least one virtual transmission period based on one or more parameters; and monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

The communication manager 515 may also perform the following operations: determining configurations of an actual transmission period and at least one virtual transmission period; selecting a transmission period corresponding to an actual transmission period or at least one dummy transmission period based on one or more parameters; and transmitting one or more measurement signals to the second device over the communication link according to the selected transmission period.

The communication manager 515 may also perform the following operations: transmitting one or more measurement signals to a first set of one or more devices according to a transmission period; receiving, from the second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and the one or more devices; and transmitting one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period. The communication manager 515 may be an example of aspects of the communication manager 810 or 910 described herein.

The communication manager 515 or subcomponents thereof may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or subcomponents thereof may be performed by a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

The communication manager 515 or subcomponents thereof may be physically located at various locations, including being distributed such that some of the functionality is implemented by one or more physical components at different physical locations. In some examples, the communication manager 515 or subcomponents thereof may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 515 or subcomponents thereof may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof, in accordance with various aspects of the present disclosure.

The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be collocated with the receiver 510 in a transceiver module. For example, the transmitter 520 may be an example of aspects of the transceiver 820 or 920 described with reference to fig. 8 and 9. The transmitter 520 may utilize a single antenna or a group of antennas.

In one or more aspects, the communication manager 515 as described herein may support improvements in SSB monitoring and transmission. An implementation may allow device 505 to more flexibly select different periods for signal transmission and corresponding monitoring of signal transmission. For example, the device 505 may dynamically select different periods for signal transmission and corresponding monitoring depending on link conditions.

Based on implementing SSB monitoring and transmission techniques as described herein, a processor of UE115 (e.g., controlling receiver 510, transmitter 520, or transceiver 820 as described with reference to fig. 8) may improve reliability, mitigate signaling overhead, and reduce latency in the network because the periodicity for signal transmission may be flexibly selected.

Fig. 6 illustrates a diagram 600 of a device 605 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of the device 505, the UE115, or the base station 105 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 650. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 610 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to synchronization signal period adjustment). Information may be passed to other components of device 605. The receiver 610 may be an example of aspects of the transceiver 820 or 920 described with reference to fig. 8 and 9. Receiver 610 may utilize a single antenna or a group of antennas.

The communication manager 615 may be an example of aspects of the communication manager 515 as described herein. The communication manager 615 may include a configuration manager 620, a link condition manager 625, a cycle manager 630, a monitoring component 635, a signal manager 640, and an indication manager 645. The communication manager 615 may be an example of aspects of the communication manager 810 or 910 as described herein.

The configuration manager 620 may determine a configuration of the actual transmission period and the at least one virtual transmission period used by the second device. The configuration manager 620 may determine a configuration of the actual transmission period and the at least one virtual transmission period.

In some cases, the link condition manager 625 may determine a link condition of a communication link between the first device and the second device. The link condition manager 625 may determine a link condition of a communication link between the first device and the second device.

The period manager 630 may select a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters. The period manager 630 may select a transmission period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters. In some cases, the one or more parameters may include link conditions. The monitoring component 635 may monitor one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

The signal manager 640 may transmit one or more measurement signals to the second device over the communication link according to the selected transmission period. Indication manager 645 may receive an indication from the second device to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and the second set of one or more devices. The signal manager 640 may transmit one or more measurement signals to a first set of one or more devices according to a transmission period and transmit one or more measurement signals to a second set of one or more devices according to at least one virtual transmission period.

Transmitter 650 may transmit signals generated by other components of device 605. In some examples, the transmitter 650 may be collocated with the receiver 610 in a transceiver module. For example, the transmitter 650 may be an example of aspects of the transceiver 820 or 920 as described with reference to fig. 8 and 9. The transmitter 650 may utilize a single antenna or a group of antennas.

Fig. 7 illustrates a diagram 700 of a communication manager 705 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The communication manager 705 may be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 may include a configuration manager 710, a link condition manager 715, a cycle manager 720, a monitoring component 725, a timing component 730, a connection manager 735, a signal manager 740, an indication manager 745, and a mode manager 750. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

The configuration manager 710 may determine a configuration of the actual transmission period and the at least one virtual transmission period used by the second device. In some cases, the link condition manager 715 may determine a link condition of a communication link between the first device and the second device. The period manager 720 may select a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters. In some cases, the one or more parameters include a link condition. The monitoring component 725 may monitor one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

In some examples, period manager 720 may select the monitoring period to correspond to the actual transmission period. In some examples, the link condition manager 715 may determine that the link condition satisfies a threshold. In some examples, period manager 720 may adjust the monitoring period to correspond to at least one virtual transmission period based on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period.

In some examples, the link condition manager 715 may determine that the link condition satisfies a second threshold. In some examples, period manager 720 may adjust the monitoring period to correspond to the actual transmission period based on the link condition satisfying a second threshold.

In some examples, the link condition manager 715 may determine that the communication link has failed based on the link condition. The connection manager 735 may establish a connection with one or more other devices based on the failed communication link. In some examples, signal manager 740 may receive one or more measurement signals from one or more other devices.

In some examples, indication manager 745 may receive an indication that the second device is transmitting one or more measurement signals according to at least one virtual transmission period. In some examples, period manager 720 may select a monitoring period to correspond to at least one virtual transmission period based on the indication.

In some examples, period manager 720 may select the monitoring period to correspond to at least one virtual transmission period based on link conditions. In some examples, indication manager 745 may send an indication to the second device that the monitoring period corresponds to the at least one virtual transmission period.

The mode manager 750 may operate in a first monitoring mode associated with an actual transmission period. In some examples, mode manager 750 may operate in a second monitoring mode associated with at least one virtual transmission period.

In some examples, indication manager 745 may receive the configuration indication via RRC signaling. In some examples, the signal manager 740 may receive one or more measurement signals from the second device based on the monitoring. In some cases, the one or more measurement signals include an SSB, or a CSI-RS, or an SRS, or a combination thereof.

In some cases, the link condition includes an error rate of information sent over the communication link. In some cases, the communication link includes one or more directional beams operating over a band of the mmW radio frequency spectrum. In some cases, the first device comprises a first node in an IAB network and the second device comprises a second node in the IAB network.

In some examples, configuration manager 710 may determine a configuration of an actual transmission period and at least one virtual transmission period. In some examples, the link condition manager 715 may determine a link condition of a communication link between the first device and the second device. In some examples, period manager 720 may select a transmission period corresponding to an actual transmission period or at least one virtual transmission period based on one or more parameters. In some cases, the one or more parameters include a link condition. The signal manager 740 may transmit one or more measurement signals to the second device over the communication link according to the selected transmission period.

In some examples, the period manager 720 may select a transmission period to correspond to an actual transmission period. In some examples, the link condition manager 715 may determine that the link condition satisfies a threshold. In some examples, period manager 720 may adjust the transmission period to correspond to at least one virtual transmission period based on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period.

The timing component 730 can start a timer based on adjusting the monitoring period to correspond to the at least one dummy transmission period. In some examples, timing component 730 may determine that a timer has expired. In some examples, indication manager 745 may send an indication to one or more other devices to send one or more measurement signals according to at least one virtual transmission period.

In some examples, the link condition manager 715 may determine that the link condition satisfies a second threshold. In some examples, period manager 720 may adjust the transmission period to correspond to the actual transmission period based on the link condition satisfying a second threshold.

In some cases, indication manager 745 may send symbol timing information for transmitting one or more measurement signals to one or more other devices.

In some examples, period manager 720 may select a transmission period to correspond to at least one virtual transmission period based on link conditions. In some examples, indication manager 745 may send an indication to the second device that the transmission period corresponds to at least one virtual transmission period.

In some examples, indication manager 745 may receive an indication that the second device is monitoring the one or more measurement signals according to the at least one virtual transmission period. In some examples, period manager 720 may select a transmission period to correspond to at least one virtual transmission period based on the indication.

In some examples, the mode manager 750 may operate in a first transmission mode associated with an actual transmission period. In some examples, mode manager 750 may operate in a second transmission mode associated with at least one virtual transmission period. In some examples, indication manager 745 may send the indication of the configuration via RRC signaling. In some examples, monitoring component 725 may monitor one or more measurement signals transmitted from one or more other devices based on expiration of a timer.

In some examples, timing component 730 may start the timer based on adjusting the transmission period to correspond to the at least one virtual transmission period. In some examples, timing component 730 may determine that a timer has expired. In some examples, indication manager 745 may send an indication to one or more other devices to send one or more measurement signals according to at least one virtual transmission period based on the link condition.

In some examples, signal manager 740 may transmit one or more measurement signals to the first set of one or more devices according to a transmission period. Indication manager 745 may receive an indication from the second device to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and the second set of one or more devices. In some cases, the one or more parameters include a link condition. In some examples, signal manager 740 may transmit one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period.

In some examples, configuration manager 710 may receive a configuration of at least one virtual transmission period used by the second device, the configuration received prior to the indication from the second device, wherein the at least one virtual transmission period is based on the configuration. In some examples, configuration manager 710 may determine a configuration of at least one virtual transmission period.

Additionally or alternatively, the indication manager 745 may receive symbol timing information from the second device and transmit one or more measurement signals to the second set of one or more devices based on the symbol timing information.

In some cases, the at least one dummy transmission period is shorter than the transmission period. In some cases, the first device comprises a first node in an IAB network and the second device comprises a second node in the IAB network.

Fig. 8 illustrates a diagram of a system 800 that includes an apparatus 805 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The device 805 may be an example of a device 505, device 605, or UE115 or include components of a device 505, device 605, or UE115 as described herein. Device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 810, a transceiver 820, an antenna 825, a memory 830, a processor 840, and an I/O controller 850. These components may be in electronic communication via one or more buses, such as bus 855.

The communication manager 810 may perform the following operations: determining a configuration of an actual transmission period and at least one virtual transmission period used by the second device; selecting a monitoring period corresponding to an actual transmission period or at least one virtual transmission period based on one or more parameters; and monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

The communication manager 810 may also: determining configurations of an actual transmission period and at least one virtual transmission period; selecting a transmission period corresponding to an actual transmission period or at least one dummy transmission period based on one or more parameters; and transmitting one or more measurement signals to the second device over the communication link according to the selected transmission period.

The communication manager 810 may also: transmitting one or more measurement signals to a first set of one or more devices according to a transmission period; receiving, from the second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and the second set of one or more devices; and transmitting one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period.

The transceiver 820 may communicate bi-directionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 820 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, as well as demodulate packets received from the antennas. In some cases, the wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825 that are capable of simultaneously transmitting or receiving multiple wireless transmissions.

The memory 830 may include Random Access Memory (RAM), Read Only Memory (ROM), or a combination thereof. Memory 830 may store computer-readable code 835, the computer-readable code 835 comprising instructions that, when executed by a processor (e.g., processor 840), cause the apparatus to perform various functions described herein. In some cases, memory 830 may contain, among other things, a basic input/output system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 840 may include intelligent hardware devices (e.g., general purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combinations thereof). In some cases, processor 840 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., functions or tasks to support synchronization signal cycle adjustment).

I/O controller 850 may manage input and output signals to and from device 805. I/O controller 850 may also manage peripheral devices that are not integrated into device 805. In some cases, I/O controller 850 may represent a physical connection or port to an external peripheral device. In some cases, I/O controller 850 may utilize logic such as Such as an operating system or another known operating system. In other cases, I/O controller 850 may represent or interact with a modem, keyboard, RAT beacon, touch screen, or similar device. In some cases, I/O controller 850 may be implemented as part of a processor. In some cases, a user may interact with device 805 via I/O controller 850 or via hardware components controlled by I/O controller 850.

Code 835 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. Code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, code 835 may not be directly executable by processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 9 illustrates a diagram of a system 900 that includes a device 905 that supports synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The device 905 may be an example of a device 505, a device 605, or a base station 105 or a component comprising a device 505, a device 605, or a base station 105 as described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, a network communication manager 915, a transceiver 920, an antenna 925, a memory 930, a processor 940, and an inter-station communication manager 945. These components may be in electronic communication via one or more buses, such as bus 955.

The communication manager 910 may perform the following operations: determining a configuration of an actual transmission period and at least one virtual transmission period used by the second device; selecting a monitoring period corresponding to an actual transmission period or at least one virtual transmission period based on one or more parameters; and monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

The communication manager 910 may also perform the following operations: determining configurations of an actual transmission period and at least one virtual transmission period; selecting a transmission period corresponding to an actual transmission period or at least one dummy transmission period based on one or more parameters; and transmitting one or more measurement signals to the second device over the communication link according to the selected transmission period.

The communication manager 910 may also perform the following operations: transmitting one or more measurement signals to a first set of one or more devices according to a transmission period; receiving, from the second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and the second set of one or more devices; and transmitting one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period.

The network communications manager 915 may manage communications with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 915 may manage the transmission of data communications for client devices (e.g., one or more UEs 115).

The transceiver 920 may communicate bi-directionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, as well as demodulate packets received from the antennas. In some cases, the wireless device may include a single antenna 925. However, in some cases, the device may have more than one antenna 925 capable of simultaneously sending or receiving multiple wireless transmissions.

The memory 930 may include RAM, ROM, or a combination thereof. The memory 930 may store computer-readable code 935, the computer-readable code 935 comprising instructions that, when executed by a processor (e.g., the processor 940), cause the apparatus to perform various functions described herein. In some cases, memory 930 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 940 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combinations thereof). In some cases, processor 940 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., functions or tasks to support synchronization signal period adjustment).

The inter-station communication manager 945 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communication manager 945 may coordinate scheduling for transmissions to the UEs 115 to implement various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-station communication manager 945 may provide an X2 interface within LTE/LTE-a wireless communication network technology to provide communication between base stations 105.

Code 935 may include instructions to implement aspects of the disclosure, including instructions to support wireless communications. Code 935 may be stored in a non-transitory computer-readable medium (e.g., system memory or other type of memory). In some cases, code 935 may not be directly executable by processor 940, but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

Fig. 10 shows a flow diagram illustrating a method 1000 of supporting synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The operations of method 1000 may be implemented by a device (e.g., a wireless device) such as UE115 or base station 105 or components thereof as described herein. For example, the operations of method 1000 may be performed by a communications manager as described with reference to fig. 5-9. In some examples, a device may execute a set of instructions to control the functional units of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform aspects of the functions described herein.

At 1005, the UE may determine a configuration of an actual transmission period and at least one virtual transmission period used by the second device. The operations of 1005 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a configuration manager as described with reference to fig. 5-9.

At 1010, the UE may select a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based on one or more parameters. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a cycle manager as described with reference to fig. 5-9.

At 1015, the UE may monitor one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operation of 1015 may be performed by a monitoring component as described with reference to fig. 5-9.

Fig. 11 shows a flow diagram illustrating a method 1100 of supporting synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The operations of method 1100 may be implemented by a device (e.g., a wireless device) or components thereof, such as UE115 or base station 105, as described herein. For example, the operations of method 1100 may be performed by a communications manager as described with reference to fig. 5-9. In some examples, a device may execute a set of instructions to control the functional units of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform aspects of the functions described herein.

At 1105, the UE may determine a configuration of an actual transmission period and at least one virtual transmission period used by the second device. The operations of 1105 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a configuration manager as described with reference to fig. 5-9.

At 1110, the UE may determine a link condition of a communication link between the first device and the second device. The operations of 1110 may be performed according to methods described herein. In some examples, aspects of the operations of 1110 may be performed by a link condition manager as described with reference to fig. 5-9.

At 1115, the UE may select a transmission period to correspond to the actual transmission period. The operations of 1115 may be performed according to methods described herein. In some examples, aspects of the operation of 1115 may be performed by a cycle manager as described with reference to fig. 5-9.

At 1120, the UE may monitor one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period. The operations of 1120 may be performed according to methods described herein. In some examples, aspects of the operations of 1120 may be performed by a monitoring component as described with reference to fig. 5-9.

At 1125, the UE may determine that a link condition satisfies a threshold. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a link condition manager as described with reference to fig. 5-9.

At 1130, the UE may adjust the monitoring period to correspond to at least one virtual transmission period based on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period. The operations of 1130 may be performed according to the methods described herein. In some examples, aspects of the operations of 1130 may be performed by a cycle manager as described with reference to fig. 5-9.

Fig. 12 shows a flow diagram illustrating a method 1200 of supporting synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The operations of method 1200 may be implemented by a device (e.g., a wireless device) such as UE115 or base station 105 or components thereof as described herein. For example, the operations of method 1200 may be performed by a communications manager as described with reference to fig. 5-9. In some examples, a device may execute a set of instructions to control the functional units of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform aspects of the functions described herein.

At 1205, the UE may determine a configuration of an actual transmission period and at least one virtual transmission period used by the second device. The operations of 1205 may be performed according to methods described herein. In some examples, aspects of the operations of 1205 may be performed by a configuration manager as described with reference to fig. 5-9.

At 1210, the UE may determine a link condition of a communication link between the first device and the second device. The operations of 1210 may be performed according to methods described herein. In some examples, aspects of the operations of 1210 may be performed by a link condition manager as described with reference to fig. 5-9.

At 1215, the UE may select a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based on the link condition. The operations of 1215 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1215 may be performed by a cycle manager as described with reference to fig. 5-9.

At 1220, the UE may monitor for one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period. The operations of 1220 may be performed according to methods described herein. In some examples, aspects of the operations of 1220 may be performed by a monitoring component as described with reference to fig. 5-9.

At 1225, the UE may determine that the communication link has failed based on the link condition. The operations of 1225 may be performed according to methods described herein. In some examples, aspects of the operations of 1225 may be performed by a link condition manager as described with reference to fig. 5-9.

At 1230, the UE may establish a connection with one or more other devices based on the failed communication link. The operations of 1230 may be performed according to methods described herein. In some examples, aspects of the operations of 1230 may be performed by a connection manager as described with reference to fig. 5-9.

At 1235, the UE may receive one or more measurement signals from one or more other devices. The operations of 1235 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1235 may be performed by a signal manager as described with reference to fig. 5-9.

Fig. 13 shows a flow diagram illustrating a method 1300 of supporting synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The operations of method 1300 may be implemented by a device (e.g., a wireless device) such as UE115 or base station 105 or components thereof as described herein. For example, the operations of method 1300 may be performed by a communication manager as described with reference to fig. 5-9. In some examples, a device may execute a set of instructions to control the functional units of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform aspects of the functions described herein.

At 1305, the UE may determine a configuration of an actual transmission period and at least one virtual transmission period. The operations of 1305 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1305 may be performed by a configuration manager as described with reference to fig. 5-9.

At 1310, the UE may select a transmission period corresponding to an actual transmission period or at least one virtual transmission period based on one or more parameters. The operations of 1310 may be performed according to methods described herein. In some examples, aspects of the operations of 1310 may be performed by a cycle manager as described with reference to fig. 5-9.

At 1315, the UE may transmit one or more measurement signals to the second device over the communication link according to the selected transmission period. The operations of 1315 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a signal manager as described with reference to fig. 5-9.

Fig. 14 shows a flow diagram illustrating a method 1400 of supporting synchronization signal period adjustment in accordance with one or more aspects of the present disclosure. The operations of method 1400 may be implemented by a device (e.g., a wireless device) such as UE115 or base station 105, or components thereof, as described herein. For example, the operations of method 1400 may be performed by a communication manager as described with reference to fig. 5-9. In some examples, a device may execute a set of instructions to control the functional units of the device to perform the functions described herein. Additionally or alternatively, a device may use dedicated hardware to perform aspects of the functions described herein.

At 1405, the UE may transmit one or more measurement signals to a first set of one or more devices according to a transmission period. The operations of 1405 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a signal manager as described with reference to fig. 5-9.

At 1410, the UE may receive, from the second device, an indication to adjust the transmission period to at least one virtual transmission period based on one or more parameters of a communication link between the second device and the second set of one or more devices. The operations of 1410 may be performed according to methods described herein. In some examples, aspects of the operations of 1410 may be performed by an indication manager as described with reference to fig. 5-9.

At 1415, the UE may transmit one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operation of 1415 may be performed by a signal manager as described with reference to fig. 5-9.

It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects from two or more methods may be combined.

Example 1: a method for communication at a first device, comprising: determining a configuration of an actual transmission period and at least one virtual transmission period used by the second device; selecting a monitoring period corresponding to the actual transmission period or the at least one virtual transmission period based at least in part on one or more parameters; and monitoring one or more measurement signals transmitted by the second device over the communication link according to the selected monitoring period.

Example 2: the method of example 1, wherein the one or more parameters comprise a link condition.

Example 3: the method of example 2, wherein the link condition comprises an error rate for information transmitted over the communication link.

Example 4: the method of any of examples 1-3, further comprising: determining a link condition of the communication link between the first device and the second device.

Example 5: the method of any of examples 1-5, further comprising: selecting the monitoring period to correspond to the actual transmission period; determining that a link condition satisfies a threshold; and adjusting the monitoring period to correspond to the at least one virtual transmission period based at least in part on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period.

Example 6: the method of example 5, further comprising: starting a timer based at least in part on adjusting the monitoring period to correspond to the at least one dummy transmission period; determining that the timer has expired; and monitor the one or more measurement signals transmitted from one or more other devices based at least in part on the timer expiring.

Example 7: the method of any of examples 5 or 6, further comprising: determining that the link condition satisfies a second threshold; and adjusting the monitoring period to correspond to the actual transmission period based at least in part on the link condition meeting the second threshold.

Example 8: the method of any of examples 1-7, further comprising: determining that the communication link has failed based at least in part on a link condition; establishing a connection with one or more other devices based at least in part on the failed communication link; and receiving the one or more measurement signals from the one or more other devices.

Example 9: the method of any of examples 1-8, further comprising: receiving an indication that the second device is transmitting the one or more measurement signals according to the at least one virtual transmission period; and selecting the monitoring period to correspond to the at least one dummy transmission period based at least in part on the indication.

Example 10: the method of any of examples 1-10, further comprising: selecting the monitoring period to correspond to the at least one dummy transmission period based at least in part on a link condition; and sending an indication to the second device that the monitoring period corresponds to the at least one dummy transmission period.

Example 11: the method of any of examples 1-10, further comprising: operating in a first monitoring mode associated with the actual transmission period.

Example 12: the method of any of examples 1-11, further comprising: operating in a second monitoring mode associated with the at least one dummy transmission period.

Example 13: the method of any of examples 1 to 12, wherein determining the configuration of the actual transmission period and the at least one virtual transmission period comprises: receiving an indication of the configuration via RRC signaling.

Example 14: the method of any of examples 1-13, further comprising: receiving the one or more measurement signals from the second device based at least in part on the monitoring.

Example 15: the method of any of examples 1-14, wherein the one or more measurement signals comprise an SSB, or a CSI-RS, or an SRS, or a combination thereof.

Example 16: the method of any of examples 1 to 15, wherein the first device comprises a first node in an IAB network and the second device comprises a second node in the IAB network.

Example 17: the method of any of examples 1-16, wherein the communication link comprises one or more directional beams operating over a mmW radio frequency spectrum band.

Example 18: an apparatus comprising at least one means for performing the method of any one of examples 1-17.

Example 19: an apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and memory configured to perform the method of any of examples 1-17.

Example 20: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of examples 1-17. Example 21: a method for communication at a first device, comprising: determining configurations of an actual transmission period and at least one virtual transmission period; selecting a transmission period corresponding to the actual transmission period or the at least one virtual transmission period based at least in part on one or more parameters; and transmitting one or more measurement signals to the second device over the communication link according to the selected transmission period.

Example 22: the method of example 21, wherein the one or more parameters comprise link conditions.

Example 23: the method of any of examples 21 or 22, further comprising: determining a link condition of the communication link between the first device and the second device.

Example 24: the method of any of examples 21-23, further comprising: selecting the transmission period to correspond to the actual transmission period; determining that a link condition satisfies a threshold; and adjusting the transmission period to correspond to the at least one virtual transmission period based at least in part on the link condition satisfying the threshold, the at least one virtual transmission period being shorter than the actual transmission period.

Example 25: the method of example 24, further comprising: starting a timer based at least in part on adjusting the transmission period to correspond to the at least one dummy transmission period; determining that the timer has expired; and transmitting an indication to one or more other devices to transmit the one or more measurement signals according to the at least one virtual transmission period.

Example 26: the method of any of examples 24 or 25, further comprising: determining that the link condition satisfies a second threshold; and adjusting the transmission period to correspond to the actual transmission period based at least in part on the link condition satisfying the second threshold.

Example 27: the method of any of examples 21-26, further comprising: transmitting, to one or more other devices, an indication to transmit the one or more measurement signals according to the at least one virtual transmission period based at least in part on a link condition.

Example 28: the method of any of examples 21-27, further comprising: transmitting symbol timing information for transmitting the one or more measurement signals to one or more other devices.

Example 29: the method of any of examples 21-28, further comprising: selecting the transmission period to correspond to the at least one virtual transmission period based at least in part on a link condition; and sending an indication to the second device that the transmission period corresponds to the at least one dummy transmission period.

Example 30: the method of any of examples 21-29, further comprising: receiving an indication that a second device is monitoring the one or more measurement signals according to the at least one virtual transmission period; and selecting the transmission period to correspond to the at least one dummy transmission period based at least in part on the indication.

Example 31: the method of any of examples 21-30, further comprising: operating in a first transmission mode associated with the actual transmission period.

Example 32: the method of any of examples 21-31, further comprising: operating in a second transmission mode associated with the at least one dummy transmission period.

Example 33: the method of any of examples 21 to 31, wherein transmitting the configuration of the actual transmission period and the at least one virtual transmission period comprises: sending an indication of the configuration via RRC signaling.

Example 34: an apparatus comprising at least one means for performing the method of any one of examples 21-33.

Example 35: an apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and memory configured to perform the method of any of examples 21-33.

Example 36: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of examples 21-33.

Example 37: a method for communication at a first device, comprising: transmitting one or more measurement signals to a first set of one or more devices according to a transmission period; receiving, from a second device, an indication to adjust the transmission period to at least one virtual transmission period based at least in part on one or more parameters of a communication link between the second device and a second set of one or more devices; and transmitting the one or more measurement signals to the second set of one or more devices according to the at least one virtual transmission period.

Example 38: the method of example 37, wherein the one or more parameters comprise link conditions.

Example 39: the method of any of examples 37 or 38, further comprising: receiving a configuration of at least one virtual transmission period used by the second device, the configuration being received prior to the indication from the second device, wherein the at least one virtual transmission period is based at least in part on the configuration.

Example 40: the method of any of examples 37-39, further comprising: determining a configuration of the at least one virtual transmission period.

Example 41: the method of any of examples 37-40, further comprising: receiving symbol timing information from a second device; and transmitting the one or more measurement signals to the second set of one or more devices based at least in part on the symbol timing information.

Example 42: the method of any of examples 37 to 41, wherein the at least one dummy transmission period is shorter than the transmission period.

Example 43: the method of any of examples 37 to 42, wherein the first wireless device comprises a first node in an IAB network and the second wireless device comprises a second node in the IAB network.

Example 44: an apparatus comprising at least one means for performing the method of any one of examples 37-43.

Example 45: an apparatus for wireless communication, comprising: a processor; and a memory coupled to the processor, the processor and memory configured to perform the method of any of examples 37-43.

Example 46: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to any one of examples 37 to 43.

The techniques described herein may be used for various wireless communication systems such as CDMA, TDMA, FDMA, OFDMA, single-carrier frequency division multiple access (SC-FDMA), and other systems. A CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. The IS-2000 version may be generally referred to as CDMA20001X, 1X, etc. IS-856(TIA-856) IS commonly referred to as CDMA20001xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes wideband CDMA (W-CDMA) and other variants of CDMA. TDMA systems may implement radio technologies such as global system for mobile communications (GSM).

The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE)802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A and LTE-A specialties are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, LTE-A specialty, NR, and GSM are described in documents from an organization named "3 rd Generation partnership project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "3 rd generation partnership project 2" (3GPP 2). The techniques described herein may be used for the systems and radio techniques mentioned herein as well as other systems and radio techniques. Although aspects of the LTE, LTE-A, LTE-a specialty, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-a specialty, or NR terminology may be used in much of the description, the techniques described herein may be applicable to ranges outside of LTE, LTE-A, LTE-a specialty, or NR applications.

A macro cell typically covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell may be associated with a lower power base station than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. According to various examples, the small cells may include pico cells, femto cells, and micro cells. For example, a pico cell may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell may also cover a small geographic area (e.g., a residence) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in the residence, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communication using one or more component carriers.

The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timings, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operations.

The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and the following claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. Features implementing functions may also be physically located at various locations, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Non-transitory storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can comprise RAM, ROM, electrically erasable programmable ROM (eeprom), flash memory, Compact Disc (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Further, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein (including in the claims), an "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list such that, for example, a list of at least one of A, B or C means a or B or C or AB or AC or BC or ABC (i.e., a and B and C). As used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition a" may be based on both condition a and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on" is interpreted.

In the drawings, similar components or features may have the same reference numerals. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description applies to any one of the similar components having the same first reference label irrespective of the second or other subsequent reference label.

The description set forth herein in connection with the appended drawings describes example configurations and is not intended to represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.