阅读说明：本技术 用于更新参考信号的技术 (Techniques for updating reference signals ) 是由 周彦 骆涛 R·何 S·布吕克 P·舍拉吉 于 2020-04-28 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。所描述的技术使用介质访问控制-控制单元(MAC-CE)或下行链路控制信息(DCI)来提供对波束故障检测(BFD)参考信号(RS)和路径损耗RS的动态更新。例如,当周期性CSI-RS用于BFD RS时,周期性CSI-RS的准共址(QCL)可以由MAC-CE或DCI动态地更新。此外,半持久性CSI-RS或非周期性CSI-RS可以充当BFD RS。增强式更新过程可以用于使用MAC-CE或DCI来动态地更新路径损耗RS。在一些情况下,经由MAC-CE或DCI更新的路径损耗RS参数可以盖写先前RRC配置的路径损耗RS参数。在另一示例中,如果没有配置路径损耗RS,则路径损耗RS默认地可以是对应的上行链路波束的空间关系参考信号。(Methods, systems, and devices for wireless communication are described. The described techniques provide dynamic updates to Beam Failure Detection (BFD) Reference Signals (RSs) and path loss RSs using a medium access control-control element (MAC-CE) or Downlink Control Information (DCI). For example, when the periodic CSI-RS is used for BFD RS, the quasi co-location (QCL) of the periodic CSI-RS may be dynamically updated by the MAC-CE or DCI. Further, a semi-persistent CSI-RS or an aperiodic CSI-RS may serve as a BFD RS. The enhanced update procedure may be used to dynamically update the path loss RS using MAC-CE or DCI. In some cases, the path loss RS parameter updated via the MAC-CE or DCI may overwrite the previously RRC-configured path loss RS parameter. In another example, if no path loss RS is configured, the path loss RS may be a spatial relationship reference signal of the corresponding uplink beam by default.)

1. A method for wireless communication, comprising:

identifying a configuration of a first quasi co-location parameter associated with a set of control resources and a reference signal; and

receiving an updated configuration of the reference signal via one or more of a Media Access Control (MAC) control unit or downlink control information based at least in part on a change in the first quasi co-location parameter associated with the set of control resources, the updated configuration indicating that a second quasi co-location parameter is configured for the reference signal.

2. The method of claim 1, further comprising:

determining that the reference signal comprises a periodic channel state information reference signal for beam failure detection.

3. The method of claim 1, further comprising:

determining that the reference signal comprises one or more of a semi-persistent channel state information reference signal or an aperiodic channel state information reference signal for beam failure detection.

4. The method of claim 3, wherein the configuration indicates that the reference signal comprises the semi-persistent channel state information reference signal or the aperiodic channel state information reference signal for beam failure detection.

5. The method of claim 1, wherein the reference signals comprise one or more of beam failure detection reference signals, periodic channel state information reference signals, or time/frequency tracking reference signals.

6. The method of claim 1, further comprising:

determining that the first quasi co-location parameter associated with the set of control resources has changed to the second quasi co-location parameter.

7. The method of claim 1, further comprising:

identifying the updated configuration based at least in part on a format of the downlink control information.

8. The method of claim 1, further comprising:

monitoring the reference signal based at least in part on the second quasi co-location parameter.

9. The method of claim 1, further comprising:

receiving a radio resource control message comprising the configuration of the reference signal, wherein the first quasi co-location parameter is indicated by a transmission configuration indicator state identifier within the radio resource control message.

10. A method for wireless communication, comprising:

receiving a message indicating a spatial relationship reference signal associated with an uplink beam;

determining whether a pathloss reference signal corresponding to the uplink beam is configured; and

monitoring the spatial relationship reference signal for path loss estimation based at least in part on determining that the path loss reference signal is not configured.

11. The method of claim 10, further comprising:

determining that the spatial relationship reference signal comprises the pathloss reference signal based at least in part on determining that the pathloss reference signal is not configured, wherein the pathloss estimate is used for uplink power control.

12. The method of claim 11, wherein the spatial relationship reference signals correspond to a set of physical uplink control channel resources.

13. The method of claim 11, wherein the spatial relationship reference signal corresponds to a set of sounding reference signal resources indicated by a sounding reference signal resource indicator.

14. The method of claim 11, wherein the uplink power control comprises one or more of physical uplink control channel power control, physical uplink shared channel power control, or sounding reference signal power control.

15. The method of claim 10, wherein the spatial relationship reference signal comprises one or more of a synchronization signal block, a channel state information reference signal, or a sounding reference signal.

16. A method for wireless communication, comprising:

determining a configuration of a first quasi co-location parameter associated with a set of control resources and a reference signal;

determining that the first quasi co-location parameter associated with the set of control resources has changed to a second quasi co-location parameter different from the first quasi co-location parameter;

identifying an updated configuration of the reference signal based at least in part on a change in the first quasi co-location parameter associated with the set of control resources, the updated configuration configuring the reference signal with the second quasi co-location parameter; and

transmitting the updated configuration of the reference signal via one or more of a Medium Access Control (MAC) control element or downlink control information.

17. The method of claim 16, further comprising:

selecting a periodic channel state information reference signal as the reference signal, wherein the configuration indicates that the periodic channel state information reference signal is used for beam failure detection.

18. The method of claim 16, further comprising:

selecting one or more of a semi-persistent channel state information reference signal or an aperiodic channel state information reference signal as the reference signal, wherein the configuration indicates that one or more of the semi-persistent channel state information reference signal or the aperiodic channel state information reference signal is used for beam failure detection.

19. The method of claim 16, wherein a format of the downlink control information indicates that the reference signal is configured with the second quasi-co-location parameter.

20. The method of claim 16, wherein the reference signals comprise one or more of beam failure detection reference signals, periodic channel state information reference signals, or time/frequency tracking reference signals.

21. The method of claim 16, further comprising:

transmitting the reference signal according to the updated configuration.

22. The method of claim 16, further comprising:

transmitting a radio resource control message comprising the configuration of the reference signal, wherein the first quasi co-location parameter is indicated by a transmission configuration indicator state identifier within the radio resource control message.

23. A method for wireless communication, comprising:

transmitting a message indicating a spatial relationship reference signal associated with an uplink beam; and

determining that no pathloss reference signal corresponding to the uplink beam is configured, wherein the spatial relationship reference signal is used for pathloss estimation based at least in part on the determination.

24. The method of claim 23, wherein the spatial relationship reference signals correspond to a set of physical uplink control channel resources.

25. The method of claim 23, wherein the spatial relationship reference signal corresponds to a set of sounding reference signal resources indicated by a sounding reference signal resource indicator.

Technical Field

The following generally relates to wireless communications and, more particularly, to techniques for updating reference signals.

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, such as Long Term Evolution (LTE) systems, LTE-advanced (LTE-a) systems, or LTE-a Pro 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-spectrum orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communication system may include multiple base stations or access network nodes, each supporting communication for multiple communication devices, which may be referred to as User Equipment (UE), simultaneously.

In some cases, the wireless communication system may use the reference signals for various purposes, such as beam failure detection, path loss estimation, channel state signaling, and so on. In some cases, the reference signal configuration may be semi-statically signaled (e.g., using Radio Resource Control (RRC) signaling) from the base station to the UE. Such signaling may also indicate a particular set of resources for one type of reference signal. However, since various system parameters associated with the reference signal may change more frequently than the receipt of this signaling, reconfiguring the reference signal using semi-static signaling techniques may result in system latency and inefficient communication.

Disclosure of Invention

The described technology relates to improved methods, systems, devices, and apparatuses that support techniques for updating reference signals. In general, the described techniques provide dynamic updates to reference signals, including beam failure detection reference signals (BFD-RS) and path loss reference signals, by a Media Access Control (MAC) control element (MAC-CE) or Downlink Control Information (DCI). In this case, the particular MAC-CE or DCI format used to update the reference signal configuration may be used to quickly update the configuration of the reference signals, which may avoid reconfiguration delays (such as when the reference signals are reconfigured via Radio Resource Control (RRC) signaling) and/or reduce signaling overhead in the system. As an example, when a change occurs in a quasi co-location (QCL) parameter of a monitored control resource set (CORESET), the QCL of the corresponding BFD-RS may be dynamically updated via the MAC-CE or DCI based on the change. For example, a periodic channel state information reference signal (CSI-RS) may be dynamically updated by the MAC-CE or DCI, where the periodic CSI-RS may be used for BFD-RS. In another example, semi-persistent CSI-RS or aperiodic CSI-RS may be configured as BFD-RS and their QCL may also be quickly updated by the MAC-CE or DCI when a change in QCL of CORESET occurs.

An enhancement process for updating the path loss reference signal is also described. In this case, the path loss reference signal may be dynamically updated using the MAC-CE or the DCI. In some examples, the path loss reference signal parameters updated via the MAC-CE or DCI may overwrite previously RRC-configured path loss reference signal parameters. In another example, if no path loss reference signal is configured (such as when the configuration of the path loss reference signal is optional), the path loss reference signal may default to the spatial relationship reference signal of the corresponding uplink beam. Specifically, if the pathloss reference signal is not configured, the pathloss reference signal may be a spatial reference signal for a spatial relationship (e.g., corresponding to a beam) of the uplink channel resource configured via RRC.

Drawings

Fig. 1 illustrates an example of a system for wireless communication that supports techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 2 illustrates an example of a system for wireless communication that supports techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 3 shows an example of a process flow supporting techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 4 illustrates an example of a process flow supporting techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 5 illustrates an example of a process flow supporting techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 6 illustrates an example of an architecture that supports techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 7 and 8 show block diagrams of devices that support techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 9 illustrates a block diagram of a communication manager that supports techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 10 shows a schematic diagram of a system including devices supporting techniques for updating reference signals, in accordance with aspects of the present disclosure.

Fig. 11 and 12 show block diagrams of devices that support techniques for updating reference signals in accordance with aspects of the present disclosure.

Fig. 13 illustrates a block diagram of a communication manager that supports techniques for updating reference signals, in accordance with aspects of the present disclosure.

Fig. 14 shows a diagram of a system including devices that support techniques for updating reference signals, in accordance with aspects of the present disclosure.

Fig. 15 to 20 show flowcharts illustrating methods of supporting techniques for updating reference signals according to aspects of the present disclosure.

Detailed Description

In some communication systems, RRC reconfiguration may be used when the Transmission Configuration Indicator (TCI) state of the periodic CSI-RS changes. The RRC reconfiguration may update quasi co-location (QCL) parameters (e.g., QCL type and/or QCL source) of the TCI state ID and channel state information reference signal (CSI-RS). In some cases, a beam failure detection reference signal (BFD-RS) may be transmitted periodically and may be configured explicitly by RRC signaling or implicitly in the TCI state of a monitored control resource set (CORESET). In some examples, the BFD-RS may include a periodic CSI-RS and a Synchronization Signal Block (SSB).

In beam failure recovery, when the monitored QCL of CORESET changes, the corresponding periodic BFD-RS may also need to change (e.g., to have a similar QCL). However, in some cases, the BFD-RS may be updated only by semi-static RRC reconfiguration signaling or by configuration of a large number of periodic CSI-RS (e.g., with a large number of TCI states). However, RRC reconfiguration may introduce reconfiguration delay, and the configuration of a large number of periodic CSI-RSs may increase the signaling overhead of the system. For example, if the BFD-RS corresponding to the monitored CORESET is explicitly configured by RRC signaling, the updated BFD-RS may be configured with a QCL that matches the QCL of the monitored CORESET, or the QCL of the original BFD-RS may be reconfigured, where both the updated BFD-RS and the reconfigured QCL may be communicated using RRC signaling. Alternatively, if the corresponding BFD-RS is implicitly configured in the TCI state of the monitored CORESET, the BFD-RS is a periodic CSI-RS in the new TCI state of the monitored CORESET. In this case, the system may need to configure periodic CSI-RS for all TCI states of CORESET.

In some systems, the path loss reference signal for power control may also be configured by RRC. For example, the pathloss reference signal may be configured by RRC in terms of a Physical Uplink Control Channel (PUCCH) spatial relationship for PUCCH power control. However, this may be an inefficient update method and may lead to latency problems when the pathloss reference signal changes (or the resources for the pathloss reference signal change). Also, for Physical Uplink Shared Channel (PUSCH) power control, a Sounding Reference Signal (SRS) resource indicator (SRI) may be used to configure the pathloss reference signal by RRC. For SRS power control, the pathloss reference signal may be configured by RRC in accordance with the set of SRS resources used for SRS power control. Therefore, when a change in the pathloss reference signal occurs in uplink power control, an RRC reconfiguration may be required, but the reconfiguration may introduce latency into the system.

As described herein, the particular MAC-CE or DCI format associated with updating the reference signal configuration may be used to update the BFD-RS to avoid reconfiguration delays and reduce signaling overhead in the system. For example, at least when the periodic CSI-RS is used for BFD-RS, the QCL of the periodic CSI-RS may be dynamically updated by the MAC-CE or DCI. Thus, the QCL of the original BFD-RS can be updated quickly without a large number of periodic CSI-RSs. In another example, the semi-persistent CSI-RS or aperiodic CSI-RS may act as BFD-RS, and their QCL may be quickly updated by the MAC-CE or DCI if the semi-persistent CSI-RS or aperiodic CSI-RS is explicitly configured as BFD-RS.

In further aspects, the described delays associated with RRC reconfiguration may be overcome using an enhanced update procedure for path loss reference signals. For example, the path loss reference signal may be dynamically updated by the MAC-CE or DCI such that the path loss reference signal may overwrite a previously RRC-configured path loss reference signal. In another example, if no path loss reference signal is configured, the path loss reference signal may be defaulted to a spatial relationship reference signal of a corresponding uplink beam. Specifically, if no path loss reference signal is configured in the PUCCH spatial relationship for PUCCH power control, the path loss reference signal may be a spatial reference signal in the spatial relationship of the corresponding PUCCH resource. If the pathloss reference signal is not configured in accordance with the SRI for PUSCH power control, the pathloss reference signal may be a spatial reference signal in the spatial relationship of the SRS resource indicated by the SRI.

Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow charts related to techniques for updating reference signals.

Fig. 1 illustrates an example of a wireless communication system 100 that supports techniques for updating reference signals in accordance with 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 a Long Term Evolution (LTE) network, an LTE-advanced (LTE-a) network, an LTE-a Pro network, or a New Radio (NR) network. In some cases, wireless communication system 100 may support enhanced broadband communications, ultra-reliable (i.e., mission critical) communications, low latency communications, and communications with low cost and low complexity devices.

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 transceiver stations, radio base stations, access points, radio transceivers, nodebs, enodebs (enbs), next generation nodebs or giga-nodebs (all of which may be referred to as gnbs), home nodebs, home enodebs, 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 UEs 115 to the base stations 105 or downlink transmissions from the base stations 105 to the UEs 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, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

The term "cell" refers to a logical communication entity for communicating with the base station 105 (e.g., over a carrier) and may be associated with an identifier (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID)) for distinguishing neighboring cells operating over 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.

The UEs 115 may be dispersed throughout the wireless communication system 100, and each UE115 may be fixed or mobile. UE115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, 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 phone, a Personal Digital Assistant (PDA), a tablet, a laptop, or a personal computer. In some examples, the UE115 may also refer to Wireless Local Loop (WLL) stations, internet of things (IoT) devices, internet of everything (IoE) devices, MTC devices, or the like, which may be implemented in various items such as home appliances, vehicles, meters, and the like.

Some UEs 115, such as 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 with a base station without human intervention. In some numbers, M2M communication or MTC may include communication from devices that integrate sensors or meters for measuring or capturing information and relaying the information to a central server or application that may utilize the information or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automatic behavior of a machine. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, medical monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business billing.

Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communications (e.g., a mode that supports unidirectional communications via transmission or reception but not both). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE115 include entering a power saving "deep sleep" mode when not engaged in active communication, or operating on a limited bandwidth (e.g., according to narrowband communication). 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 of a group of UEs 115 communicating with D2D may be within the geographic coverage area 110 of the base station 105. The other UEs 115 in the 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, a group of UEs 115 communicating via D2D communication may use 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 communications. 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 communicated through the S-GW, which itself may 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. Operator IP services may include access to the internet, intranets, IP Multimedia Subsystem (IMS), and Packet Switched (PS) streaming services.

At least some of the network devices, such as 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 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 gigahertz (GHz). Generally, the region from 300MHz to 3GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the length of the wavelength ranges from about 1 decimeter to 1 meter. Building and environmental features may block or redirect UHF waves. However, the waves are sufficient to penetrate the structure to allow 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) compared to 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 (also referred to as the centimeter band) using a frequency band from 3GHz to 30 GHz. The SHF region includes frequency bands such as the 5GHz industrial, scientific, and medical (ISM) bands that 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 millimeter wave (mmW) communication between the UE115 and the base station 105, and the EHF antennas of the various devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may experience 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 vary from country to country or regulatory agency to country.

In some cases, the wireless communication system 100 may utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band, such as the 5GHz ISM band. When operating in the unlicensed radio frequency spectrum band, wireless devices such as base stations 105 and UEs 115 may employ a listen-before-talk (LBT) procedure to ensure that the frequency channel is clear before transmitting data. In some cases, operation in the unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in conjunction with component carriers operating in the licensed band. 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., UE 115), 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 increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, the multiple signals may be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, a receiving device may receive the multiple signals via different antennas or different combinations of antennas. Each of the plurality of 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 a different data stream. 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 may be used at a transmitting device or a receiving device (e.g., base station 105 or UE 115) to shape 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 combining signals transmitted via antenna elements of an antenna array such that signals propagating in a particular direction with respect to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals communicated via the antenna elements may include the transmitting device or the receiving device applying certain amplitude and phase offsets to the signals transmitted via each antenna element associated with the device. The adjustment associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to an antenna array of a transmitting device or a receiving device, or relative to some other direction).

In one example, the base station 105 may use multiple antennas or antenna arrays for beamforming operations for directional communication with the UEs 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times in different directions by the base station 105, which may include transmitting signals 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 such as the UE 115) for subsequent transmissions and/or receptions by the base station 105.

Some signals, e.g., data signals associated with a particular receiving device, may be transmitted by the base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as the 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 signals transmitted by the base station 105 in different directions, and the UE115 may report an indication to the base station 105 of the signal it received with the highest signal quality or other 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 UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

A receiving device (e.g., UE115, which may be an example of a mmW receiving device) may attempt multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may attempt multiple receive directions by: receiving via different antenna sub-arrays, processing received signals according to the different antenna sub-arrays, receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of the antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of the antenna array, any of which 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). The single receive beam may be aligned in a beam direction determined based at least in part on listening from different receive beam directions (e.g., the beam direction determined to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based at least in part 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, which 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 a plurality of rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UEs 115. Also, the UE115 may have one or more antenna arrays, which 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 in some cases 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, a Radio Resource Control (RRC) protocol layer may provide for establishment, configuration, and maintenance of RRC connections of radio bearers supporting 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 of successfully receiving the data. HARQ feedback is one technique used to increase the likelihood of correctly receiving data over 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 simultaneous slot HARQ feedback, where the device may provide HARQ feedback in one 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.

The time interval in LTE or NR may be in basic time units (which may be referred to as T)_sA sampling period of 1/30,720,000 seconds). 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 T_f＝307,200T_s. The radio frame 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. The sub-frame may be further divided into 2 slots each having a duration of 0.5ms, each slot containing 6 or 7 modulation symbol periods (depending on the length of the cyclic prefix preceding each symbol period). Without including a cyclic prefix, 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 selected component carriers using sTTI).

In some wireless communication systems, a slot may be further divided into a plurality of mini-slots containing one or more symbols. In some cases, the symbol of the mini-slot or the mini-slot may be the smallest scheduling unit. For example, the duration of each symbol may vary depending on the subcarrier spacing or operating frequency band. Further, some wireless communication systems may implement timeslot aggregation, where multiple timeslots or mini-timeslots are aggregated together and used for communication between the UE115 and the base station 105.

The term "carrier" refers to a set of radio spectrum resources having a defined physical layer structure for supporting communication over the communication link 125. For example, the carrier of the communication link 125 may comprise a portion of a radio spectrum band operating in accordance with a physical layer channel 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 located according to a channel grid for discovery by UEs 115. The carriers may be downlink or uplink (e.g., in FDD mode), or 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 the carriers may be different for different radio access technologies (e.g., LTE-A, LTE-A Pro, NR, etc.). For example, communications on carriers may be organized according to TTIs or time slots, each of which may include user data as well as control information or signaling to support decoding of the user data. The carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate carrier operation. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have control signaling or acquisition signaling to coordinate operation of other carriers.

The physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and physical data channels may be multiplexed on a downlink carrier, for example 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 spectrum, and in some examples, the carrier bandwidth may be referred to as a 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 a particular radio 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 Resource Blocks (RBs)) (e.g., an "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 of the UE115 may be. In a MIMO system, wireless communication resources may refer to a combination of radio 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 communicating 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 carrier bandwidth of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and/or a UE115 that may support 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, which may be referred to as Carrier Aggregation (CA) or multi-carrier operation. The UE115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with FDD and TDD component carriers.

In some cases, the wireless communication system 100 may use 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 featuring a wide carrier bandwidth may include one or more segments that may be used by UEs 115 that are not able to monitor the entire carrier bandwidth or are configured to use a limited carrier bandwidth (e.g., to save power).

In some cases, an eCC may use 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, such as a UE115 or a base station 105, may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20, 40, 60, 80MHz, etc.) 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.

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

In some cases, the base station 105 may transmit a new MAC-CE or DCI format, which may be used to change BFD-RS at the UE115 to avoid reconfiguration delays and reduce signaling overhead (e.g., RRC signaling) in the system 100. For example, when the QCL for the antenna ports at the UE115 needs to be updated, the QCL for the periodic CSI-RS at the UE115 can be dynamically updated through MAC-CE or DCI from the base station 105, at least when the periodic CSI-RS is used for BFD-RS. Thus, the QCL of the original BFD-RS can be updated quickly without requiring a large number of periodic CSI-RSs. In another example, a semi-persistent CSI-RS or an aperiodic CSI-RS may serve as a BFD-RS.

In another example, an enhanced update procedure for the pathloss reference signal may be used to dynamically change the pathloss reference signal at the UE115 using MAC-CE or DCI transmitted from the base station 105. In some cases, the path loss reference signal parameters updated via MAC-CE or DCI from the base station 105 may overwrite the path loss reference signal parameters from the base station 105's previous RRC configuration. In another example, if no path loss reference signal is configured at the UE115, the path loss reference signal may default to a spatial relationship reference signal for the corresponding uplink beam of the UE 115.

Fig. 2 illustrates an example of a wireless communication system 200 that supports techniques for updating reference signals in accordance with aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a UE 115-a and a base station 105-a, which may be examples of the UE115 and base station 105 as described with reference to fig. 1.

In the wireless communication system 200, the reference signal 215 may include a periodic CSI-RS that may serve as a BFD-RS, and the control message 220 may include a MAC-CE or DCI. In some cases, RRC reconfiguration may be required when the TCI state for periodic CSI-RS changes. The RRC reconfiguration may update the TCI state ID and QCL channel state information reference signal 215 (e.g., CSI-RS) parameters (e.g., QCL type and/or QCL source). In some cases, the BFD-RS may be transmitted periodically and may be configured explicitly through RRC signaling or implicitly via the monitored TCI state of CORESET. In some examples, the BFD-RS may include periodic CSI-RS and SSB.

In beam failure recovery, when the monitored QCL of CORESET changes for UE 115-a, a control message 220 (e.g., a new MAC-CE or DCI format) may be used to update the reference signal 215 parameters (e.g., BFD-RS parameters) to avoid reconfiguration delays and reduce signaling overhead in the system. For example, the QCL of the periodic CSI-RS may be dynamically updated by the control message 220 (e.g., MAC-CE or DCI), at least when the reference signal 215 is a periodic CSI-RS for BFD-RS. Thus, the QCL of the original reference signal 215 (e.g., BFD-RS) may be updated quickly without requiring a large number of periodic CSI-RSs. In another example, semi-persistent or aperiodic reference signals 215 (e.g., CSI-RS) may act as BFD-RS, and if semi-persistent CSI-RS or aperiodic CSI-RS are explicitly configured as BFD-RS, their QCL may be quickly updated by control messages 220 (e.g., MAC-CE or DCI).

In some systems, the reference signal 215 (e.g., a path loss reference signal) used for power control may be RRC configured. For example, the reference signal 215 (e.g., path loss reference signal) may be configured by RRC in terms of the Physical Uplink Control Channel (PUCCH) spatial relationship for PUCCH power control, however, this may be an inefficient updating method and may lead to latency issues. For PUSCH power control, the reference signal 215 (e.g., a path loss reference signal) may be configured by RRC in accordance with SRI. For SRS power control, reference signals 215 (e.g., pathloss reference signals) may be configured by RRC in accordance with the set of SRS resources used for SRS power control. When a change in the reference signal 215 (e.g., path loss reference signal) occurs in uplink power control, an enhanced update procedure for the reference signal 215 (e.g., path loss reference signal) may be used to overcome previous deficiencies of RRC reconfiguration. For example, the reference signal 215 (e.g., a pathloss reference signal) may be dynamically updated by the control message 220 (e.g., MAC-CE or DCI) such that the reference signal 215 (e.g., pathloss reference signal) may overwrite a previously RRC-configured reference signal 215 (e.g., pathloss reference signal).

In another example, if no path loss reference signal is configured, the path loss reference signal may default to the reference signal 215 (e.g., spatial relationship reference signal) of the corresponding uplink beam. Specifically, if no path loss reference signal is configured in the PUCCH spatial relationship for PUCCH power control, the path loss reference signal may be a reference signal 215 (e.g., a spatial relationship reference signal) in the spatial relationship of the corresponding PUCCH resource. If the pathloss reference signal is not configured in accordance with the SRI for PUSCH power control, the pathloss reference signal may be a reference signal 215 (e.g., a spatial reference signal) in the spatial relationship of the SRS resource indicated by the SRI.

Fig. 3 shows an example of a process flow 300 supporting techniques for updating reference signals in accordance with aspects of the present disclosure. In some examples, process flow 300 may implement aspects of wireless communication system 100. Process flow 300 may be implemented by a base station 105-b and a UE115-b, which may be examples of UE115 and base station 105, respectively, described with reference to fig. 1. Alternative examples may be implemented in which some steps are performed in a different order than described or not performed at all. In some cases, the steps may include additional features not mentioned below, or additional steps may be added.

At 305, the base station 105-b may determine a configuration of first quasi co-location parameters associated with a set of control resources and a reference signal. In some cases, the reference signals may include one or more of beam failure detection reference signals, periodic CSI-RS, or time/frequency tracking reference signals.

In some examples, the base station 105-b may select a periodic CSI-RS as the reference signal, wherein the configuration indicates that the periodic CSI-RS is used for beam failure detection. In another example, the base station 105-b can select one or more of a semi-persistent CSI-RS or an aperiodic CSI-RS as the reference signal, wherein the configuration indicates that the one or more of the semi-persistent CSI-RS or the aperiodic CSI-RS is used for beam failure detection.

At 310, the base station 105-b may optionally transmit a radio resource control message including the configuration of the reference signal, wherein the first quasi co-location parameter is indicated by a transmission configuration indicator state identifier within the radio resource control message.

At 315, the UE115-b may identify a configuration of first quasi co-location parameters associated with the control resource set and the reference signal.

In some examples, UE115-b may determine that the reference signal includes periodic CSI-RS for beam failure detection, or that the reference signal includes one or more of semi-persistent CSI-RS or aperiodic CSI-RS for beam failure detection. The configuration may indicate that the reference signal includes a semi-persistent CSI-RS or an aperiodic CSI-RS for beam failure detection.

At 320, the base station 105-b may determine that a first quasi co-location parameter associated with the set of control resources has changed to a second quasi co-location parameter different from the first quasi co-location parameter.

At 325, the base station 105-b can identify an updated configuration for the reference signal based on a first quasi co-location parameter change associated with a set of control resources, the updated configuration configuring the reference signal with a second quasi co-location parameter.

At 330, the base station 105-b may transmit the updated configuration of the reference signal via one or more of MAC-CE or DCI. For example, a format of the downlink control information may indicate that the reference signal is configured with the second quasi-co-location parameter.

In some cases, the base station 105-b may then transmit the reference signal according to the updated configuration, and the UE115-b may monitor the reference signal based at least in part on the second quasi co-location parameter.

Fig. 4 shows an example of a process flow 400 supporting techniques for updating reference signals in accordance with aspects of the present disclosure. In some examples, process flow 400 may implement aspects of wireless communication system 100. Process flow 400 may be implemented by a base station 105-c and a UE115-c, which may be examples of UE115 and base station 105, respectively, described with reference to fig. 1. Alternative examples may be implemented in which some steps are performed in a different order than described or not performed at all. In some cases, the steps may include additional features not mentioned below, or additional steps may be added.

At 405, the base station 105-c may send a first message to the UE115-c indicating a first set of reference signal resources configured for a pathloss reference signal. In some cases, the first message may include an RRC message for uplink power control. The uplink power control may be one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control.

At 410, the base station 105-c may determine that the first set of reference signal resources indicated at 405 has changed to a second set of reference signal resources.

At 415, the base station 105-c may send a second message to the UE115-c indicating a second set of reference signal resources configured for pathloss reference signals based on the determination at 410 that the first set of reference signal resources has changed. The second message may include one or more of MAC-CE or DCI.

At 420, UE115-c may optionally overwrite the first set of reference signal resources received at 405 with a second set of reference signal resources based on receiving the second message at 415.

At 425, the UE115-c may optionally estimate pathloss for the uplink bandwidth portion based on a second set of reference signal resources associated with pathloss reference signals. In some examples, the path loss reference signal may include one or more of a CSI-RS or an SSB.

Fig. 5 shows an example of a process flow 500 supporting techniques for updating reference signals in accordance with aspects of the present disclosure. In some examples, process flow 500 may implement aspects of wireless communication system 100. Process flow 500 may be implemented by a base station 105-d and a UE115-d, which may be examples of UE115 and base station 105, respectively, described with reference to fig. 1. Alternative examples may be implemented in which some steps are performed in a different order than described or not performed at all. In some cases, the steps may include additional features not mentioned below, or additional steps may be added.

At 505, the UE115-d may receive a message from the base station 105-d. The message may indicate spatial relationship reference signals associated with the uplink beams. The spatial relationship reference signals may correspond to a set of physical uplink control channel resources. In some examples, the spatial relationship reference signal may include one or more of a synchronization signal block, a CSI-RS, or a SRS.

At 510, the UE115-d may determine whether a path loss reference signal corresponding to the uplink beam is configured.

At 515, the UE115-d may optionally determine that the spatial relationship reference signal comprises a path loss reference signal based on determining that no path loss reference signal is configured. The path loss estimate may be used for uplink power control. The uplink power control may include one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control.

At 520, the base station 105-d may determine that a path loss reference signal corresponding to the uplink beam may not be configured. Based on this determination, the spatial relationship reference signal may be estimated by a path loss.

At 525, the base station 105-d may optionally transmit the spatial relationship reference signal. In some cases, the spatial relationship reference signal may correspond to a set of SRS resources indicated by an SRS resource indicator.

At 530, the UE115-d may monitor the spatial relationship reference signal for path loss estimation based on determining an unconfigured path loss reference signal.

Fig. 6 illustrates an example of an architecture 600 that supports techniques for updating reference signals in accordance with aspects of the present disclosure. In some examples, the architecture 600 may implement aspects of the wireless communication systems 100 and/or 200. In some cases, the architecture 600 may be an example of a transmitting device (e.g., a first wireless device, such as UE115 or base station 105) and/or a receiving device (e.g., a second wireless device, such as UE115 or base station 105) as described herein.

Fig. 6 illustrates example hardware components of a wireless device in accordance with one or more aspects of the present disclosure. The illustrated components may include components that may be used for antenna element selection and/or for beamforming for transmission of wireless signals. There are a variety of architectures for antenna element selection and implementing phase shifting, of which only one example is shown here. Architecture 600 includes a modem (modulator/demodulator) 602, a digital-to-analog converter (DAC)604, a first mixer 606, a second mixer 608, and a splitter 610. The architecture 600 also includes a plurality of first amplifiers 612, a plurality of phase shifters 614, a plurality of second amplifiers 616, and an antenna array 618 including a plurality of antenna elements 620. Transmission lines or other waveguides, wires, traces, etc. connecting the various components are shown to illustrate how signals to be transmitted may propagate between the components. Blocks 622, 624, 626, and 628 indicate regions in architecture 600 where different types of signals are propagated or processed. In particular, block 622 indicates the region where the digital baseband signal is propagated or processed, block 624 indicates the region where the analog baseband signal is propagated or processed, block 626 indicates the region where the analog Intermediate Frequency (IF) signal is propagated or processed, and block 628 indicates the region where the analog Radio Frequency (RF) signal is propagated or processed. The architecture also includes a local oscillator a 630, a local oscillator B632, and a communication manager 634.

Each antenna element 620 may include one or more sub-elements (not shown) for radiating or receiving RF signals. For example, a single antenna element 620 may include a first subelement cross-polarized with a second subelement, which may be used to independently transmit cross-polarized signals. Antenna element 620 may include a patch antenna or other type of antenna arranged in a linear, two-dimensional, or other pattern. The spacing between the antenna elements 620 may be such that signals having desired wavelengths respectively transmitted by the antenna elements 620 may interact or interfere (e.g., to form a desired beam). For example, given an expected range of wavelengths or frequencies, the spacing may provide a quarter wavelength, half wavelength, or other fraction of a wavelength spacing between adjacent antenna elements 620 to allow for interaction or interference of signals transmitted by the individual antenna elements 620 within the expected range.

The modem 602 processes and generates digital baseband signals and may also control the operation of the DAC 604, the first and second mixers 606, 608, the splitter 610, the first amplifier 612, the phase shifter 614, and/or the second amplifier 616 to transmit signals via one or more or all of the antenna elements 620. The modem 602 may process signals and control operation according to a communication standard, such as the wireless standard discussed herein. DAC 604 may convert digital baseband signals received from (and to be transmitted by) modem 602 to analog baseband signals. The first mixer 606 upconverts the analog baseband signal to an analog IF signal within the IF using local oscillator a 630. For example, the first mixer 606 may mix the signal with an oscillating signal generated by local oscillator a 630 to "move" the baseband analog signal to IF. In some cases, some processing or filtering (not shown) may be performed at the IF. Second mixer 608 upconverts the analog IF signal to an analog RF signal using local oscillator B632. Similar to the first mixer, the second mixer 608 may mix the signal with an oscillating signal generated by local oscillator B632 to "shift" the IF analog signal to RF, or the frequency at which the signal is to be transmitted or received. Modem 602 and/or communication manager 634 may adjust the frequency of local oscillator a 630 and/or local oscillator B632 to produce a desired IF and/or RF frequency and use it to facilitate processing and transmission of signals within a desired bandwidth.

In the illustrated architecture 600, the signal upconverted by the second mixer 608 is split or replicated into multiple signals by a splitter 610. Splitter 610 in architecture 600 splits the RF signal into a plurality of identical or nearly identical RF signals, as indicated by its presence in block 628. In other examples, the separation may be performed using any type of signal, including using baseband digital, baseband analog signals, or IF analog signals. Each of these signals may correspond to an antenna element 620 and propagate through and be processed by amplifiers 612, 616, phase shifter 614, and/or other elements corresponding to the respective antenna element 620 to be provided to and transmitted by the corresponding antenna element 620 of antenna array 618. In one example, splitter 610 may be an active splitter that is connected to a power supply and provides some gain so that the RF signal exiting splitter 610 is at a power level equal to or greater than the signal entering splitter 610. In another example, splitter 610 is a passive splitter that is not connected to a power source, and the RF signal exiting splitter 610 may be at a lower power level than the RF signal entering splitter 610.

After being split by splitter 610, the resulting RF signal may enter an amplifier, such as a first amplifier 612 or a phase shifter 614 corresponding to antenna element 620. The first amplifier 612 and the second amplifier 616 are shown in dashed lines, as one or both of them may not be necessary in some implementations. In one embodiment, both the first amplifier 612 and the second amplifier 614 are present. In another embodiment, neither the first amplifier 612 nor the second amplifier 614 is present. In other embodiments, one of the two amplifiers 612, 614 is present, but the other is not. As an example, if the splitter 610 is an active splitter, the first amplifier 612 may not be used. As a further example, if the phase shifter 614 is an active phase shifter capable of providing gain, the second amplifier 616 may not be used.

The amplifiers 612, 616 may provide a desired level of positive or negative gain. Positive gain (positive dB) may be used to increase the amplitude of the signal radiated by a particular antenna element 620. Negative gain (negative dB) may be used to reduce the amplitude and/or suppress radiation of signals of a particular antenna element. Each of the amplifiers 612, 616 may be independently controlled (e.g., by the modem 602 or the communication manager 634) to provide independent control of the gain of each antenna element 620. For example, the modem 602 and/or the communication manager 634 may have at least one control line connected to each of the splitter 610, the first amplifier 612, the phase shifter 614, and/or the second amplifier 616 that may be used to configure the gain to provide a desired amount of gain for each component and thus each antenna element 620.

The phase shifter 614 may provide a configurable phase shift or phase offset to the respective RF signal to be transmitted. Phase shifter 614 may be a passive phase shifter that is not directly connected to a power source. Passive phase shifters may introduce some insertion loss. The second amplifier 616 may boost the signal to compensate for insertion loss. Phase shifter 614 may be an active phase shifter connected to a power supply such that the active phase shifter provides a certain amount of gain or prevents insertion loss. The settings of each phase shifter 614 are independent, meaning that each phase shifter 614 may be set to provide a desired amount of phase shift or the same amount of phase shift or some other configuration. Modem 602 and/or communication manager 634 may have at least one control line connected to each phase shifter 614 and which may be used to configure phase shifters 614 to provide a desired phase shift or phase offset between antenna elements 620.

In the illustrated architecture 600, the RF signals received by the antenna elements 620 are provided to one or more first amplifiers 656 to enhance signal strength. The first amplifier 656 may be connected to the same antenna array 618, e.g., for TDD operation. The first amplifier 656 may be connected to different antenna arrays 618. The enhanced RF signals are input to one or more of the phase shifters 654 to provide a configurable phase shift or phase offset for the corresponding received RF signal. Phase shifter 654 may be an active phase shifter or a passive phase shifter. The arrangement of phase shifters 654 is independent, meaning that each phase shifter 654 may be arranged to provide a desired amount of phase shift or the same amount of phase shift or some other configuration. Modem 602 and/or communication manager 634 may have at least one control line connected to each phase shifter 654, and this control line may be used to configure phase shifters 654 to provide a desired phase shift or phase offset between antenna elements 620.

The output of the phase shifter 654 may be input to one or more second amplifiers 652 for signal amplification of the phase-shifted received RF signal. The second amplifier 652 may be separately configured to provide a configured amount of gain. The second amplifier 652 may be separately configured to provide an amount of gain to ensure that the signals input to the combiner 650 have the same amplitude. Amplifiers 652 and/or 656 are shown in dashed lines because they may not be necessary in some implementations. In one embodiment, both amplifier 652 and amplifier 656 are present. In another embodiment, neither amplifier 652 nor amplifier 656 is present. In other embodiments, one of amplifiers 652, 656 is present, but the other is not.

In the illustrated architecture 600, the signals output by phase shifters 654 (via amplifiers 652 when amplifiers 652 are present) are combined in combiner 650. A combiner 650 in the architecture combines the RF signals into a signal, as indicated by its presence in block 628. The combiner 650 may be, for example, a passive combiner that is not connected to a power supply, which may result in some insertion loss. The combiner 650 may be, for example, an active combiner connected to a power supply, which may result in some signal gain. When combiner 650 is an active combiner, it may provide a different (e.g., configurable) amount of gain for each input signal so that the input signals have the same amplitude when they are combined. When combiner 650 is an active combiner, it may not require second amplifier 652 because the active combiner may provide signal amplification.

The output of the combiner 650 is input to mixers 648 and 646. Mixers 648 and 646 typically down-convert the received RF signal using inputs from local oscillators 672 and 670, respectively, to create an intermediate or baseband signal carrying the encoded and modulated information. The outputs of the mixers 648 and 646 are input to an analog-to-digital converter (ADC)644 for conversion to an analog signal. The analog signal output from the ADC 644 is input to the modem 602 for baseband processing, e.g., decoding, deinterleaving, etc.

Architecture 600 is presented by way of example to illustrate an architecture for transmitting and/or receiving signals. It should be appreciated that the architecture 600 and/or each portion of the architecture 600 may be repeated multiple times within the architecture to accommodate or provide any number of RF chains, antenna elements, and/or antenna panels. Moreover, many alternative architectures are possible and contemplated. For example, although a single antenna array 618 is shown, two, three, or more antenna arrays may be included, each having one or more of their own respective amplifiers, phase shifters, splitters, mixers, DACs, ADCs, and/or modems. For example, a single UE115 may include two, four, or more antenna arrays for transmitting or receiving signals at different physical locations or in different directions on the UE 115.

Furthermore, in different implementation architectures, mixers, splitters, amplifiers, phase shifters, and other components may be located in different signal type regions (e.g., different ones of blocks 622, 624, 626, 628). For example, in different examples, the splitting of the signal to be transmitted into multiple signals may occur at analog RF, analog IF, analog baseband, or digital baseband frequencies. Similarly, amplification and/or phase shifting may also occur at different frequencies. For example, in some contemplated embodiments, one or more of the splitter 610, the amplifiers 612, 616, or the phase shifter 614 may be located between the DAC 604 and the first mixer 606 or between the first mixer 606 and the second mixer 608. In one example, the functionality of one or more components may be combined into one component. For example, the phase shifter 614 may perform amplification to include or replace the first amplifier 612 and/or the second amplifier 616. As another example, the second mixer 608 may implement phase shifting to eliminate the need for a separate phase shifter 614. This technique may sometimes be referred to as Local Oscillator (LO) phase shifting. In one embodiment of this configuration, there may be multiple IF-to-RF mixers (e.g., for each antenna element chain) within second mixer 608, and local oscillator B632 will provide a different local oscillator signal (with a different phase offset) to each IF-to-RF mixer.

The modem 602 and/or the communication manager 634 may control one or more of the other components 604 and 472 to select one or more of the antenna elements 620 and/or form a beam for transmitting one or more signals. For example, by controlling the amplitude of one or more respective amplifiers (such as the first amplifier 612 and/or the second amplifier 616), the antenna elements 620 may be individually selected or deselected for transmission of the signal (or signals). Beamforming includes generating beams using multiple signals on different antenna elements, where one or more or all of the multiple signals are shifted in phase relative to each other. The formed beams may carry physical or higher layer reference signals or information. As each of the plurality of signals radiates from the respective antenna element 620, the radiated signals interact, interfere (constructive and destructive interference) and amplify each other to form a resultant beam. The shape (such as the amplitude, width and/or presence of side lobes) and direction (such as the angle of the beam relative to the surface of the antenna array 618) may be dynamically controlled by modifying the phase shift or phase offset imparted by the phase shifter 614 and the amplitude imparted by the amplifiers 612, 616 of the multiple signals relative to each other.

In some examples, when the architecture 600 is configured as a receiving device, the communication manager 634 may identify a configuration of the first QCL parameters associated with the set of control resources and the reference signal. The communications manager 634 may receive an updated configuration of reference signals via one or more of MAC-CE or DCI based on a change in the first QCL parameter associated with the set of control resources. In this case, the updated configuration may indicate that the second QCL parameter is configured for the reference signal. In another example, communications manager 634 can receive a first message indicating a first set of reference signal resources configured for a pathloss reference signal. The communications manager 634 may also receive a second message indicating a second set of reference signal resources configured for a pathloss reference signal based on the first set of reference signal resources changing, wherein the second message includes one or more of a MAC-CE or DCI. In some cases, the communication manager 634 may receive a message indicating a spatial relationship reference signal associated with an uplink beam. The communication manager 634 may determine whether a path loss reference signal corresponding to the uplink beam is configured. Further, the communication manager 634 may monitor the spatial relationship reference signals for path loss estimation based on determining that no path loss reference signals are configured.

Additionally or alternatively, when the architecture 600 is configured as a transmitting device, the communication manager 634 can determine a configuration of the first QCL parameters associated with the set of control resources and the reference signal. In some cases, the communications manager 634 can determine that a first QCL parameter associated with a set of control resources has changed to a second QCL parameter different from the first QCL parameter. The communications manager 634 can identify an updated configuration for the reference signal based on a change in the first QCL parameter associated with the set of control resources, wherein the updated configuration configures the reference signal with the second QCL parameter. The communication manager 634 may transmit the updated configuration of the reference signal via one or more of the MAC-CE or the DCI.

In some examples, communications manager 634 may send a first message indicating a first set of reference signal resources configured for a path loss reference signal. The communications manager 634 may determine that the first set of reference signal resources has changed to the second set of reference signal resources and send a second message indicating the second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing. In this case, the second message may include one or more of MAC-CE or DCI. In some aspects, the communication manager 634 may transmit a message indicating spatial relationship reference signals associated with uplink beams. The communication manager 634 may determine that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation.

The communication manager 634 may reside partially or completely within one or more other components of the architecture 600. For example, in at least one embodiment, communication manager 634 may be located within modem 602.

Fig. 7 illustrates a block diagram 700 of an apparatus 705 that supports techniques for updating reference signals in accordance with aspects of the present disclosure. The device 705 may be an example of aspects of a UE115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 710 can receive information such as packets associated with various information channels (e.g., control channels, data channels, and information related to techniques for updating reference signals, etc.), user data, or control information. Information may be passed to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. Receiver 710 can utilize a single antenna or a group of antennas.

The communication manager 715 may: the method further includes identifying a configuration of first QCL parameters associated with the set of control resources and the reference signal, and receiving an updated configuration of the reference signal via one or more of the MAC-CE or the DCI based on a change in the first QCL parameters associated with the set of control resources, the updated configuration indicating that the second QCL parameters are configured for the reference signal.

The communication manager 715 may also: the apparatus generally includes means for receiving a first message indicating a first set of reference signal resources configured for pathloss reference signals, and means for receiving a second message indicating a second set of reference signal resources configured for pathloss reference signals based on a change in the first set of reference signal resources, wherein the second message includes one or more of MAC-CE or DCI. The communication manager 715 may also: the method includes receiving a message indicating spatial relationship reference signals associated with an uplink beam, determining whether a pathloss reference signal corresponding to the uplink beam is configured, and monitoring the spatial relationship reference signals for pathloss estimation based on determining that no pathloss reference signal is configured. The communication manager 715 may be an example of aspects of the communication manager 634 and/or the communication manager 1010 described herein.

The communication manager 715 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 715 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 715 or subcomponents thereof may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical devices at different physical locations. In some examples, the communication manager 715 or subcomponents thereof may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 715 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 combinations thereof, in accordance with various aspects of the present disclosure.

Transmitter 720 may transmit signals generated by other components of device 705. In some examples, transmitter 720 may be collocated with receiver 710 in a transceiver module. For example, the transmitter 720 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. The transmitter 720 may utilize a single antenna or a group of antennas.

Fig. 8 illustrates a block diagram 800 of an apparatus 805 that supports techniques for updating reference signals in accordance with aspects of the present disclosure. The device 805 may be an example of aspects of the device 705 or UE115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 840. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 810 can receive information such as packets associated with various information channels (e.g., control channels, data channels, and information related to techniques for updating reference signals, etc.), user data, or control information. Information may be passed to other components of the device 805. The receiver 810 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. Receiver 810 can utilize a single antenna or a group of antennas.

The communication manager 815 may be an example of aspects of the communication manager 715 as described herein. Communications manager 815 may include a QCL manager 820, a UE configuration component 825, a reference signal manager 830, and a monitoring component 835. The communication manager 815 may be an example of aspects of the communication manager 1010 described herein.

QCL manager 820 may identify a configuration of first QCL parameters associated with a set of control resources and a reference signal. UE configuring component 825 may receive an updated configuration of the reference signal via one or more of MAC-CE or DCI based on a change in the first QCL parameter associated with the set of control resources, the updated configuration indicating that the second QCL parameter is configured for the reference signal.

The reference signal manager 830 may receive a first message indicating a first set of reference signal resources configured for a path loss reference signal. UE configuring component 825 may receive a second message indicating a second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing, wherein the second message includes one or more of MAC-CE or DCI.

The reference signal manager 830 may receive a message indicating a spatial relationship reference signal associated with an uplink beam. UE configuring component 825 may determine whether a path loss reference signal corresponding to the uplink beam is configured. The monitoring component 835 may monitor the spatial relationship reference signal for path loss estimation based on determining that no path loss reference signal is configured.

Transmitter 840 may transmit signals generated by other components of device 805. In some examples, the transmitter 840 may be collocated with the receiver 810 in a transceiver module. For example, the transmitter 840 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. Transmitter 840 may utilize a single antenna or a group of antennas.

Fig. 9 illustrates a block diagram 900 of a communication manager 905 that supports techniques for updating reference signals in accordance with aspects of the present disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, the communication manager 815, or the communication manager 1010 described herein. Communications manager 905 may include a QCL manager 910, a UE configuration component 915, a reference signal manager 920, a monitoring component 925, and a path loss component 930. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

QCL manager 910 may identify a configuration of first QCL parameters associated with a set of control resources and a reference signal. In some examples, QCL manager 910 may determine that a first QCL parameter associated with a set of control resources has changed to a second QCL parameter.

UE configuring component 915 may receive an updated configuration of the reference signal via one or more of the MAC-CE or the DCI based on a change in the first QCL parameter associated with the set of control resources, the updated configuration indicating that the second QCL parameter is configured for the reference signal. In some examples, a second message is received indicating a second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing, wherein the second message includes one or more of MAC-CE or DCI.

In some examples, UE configuring component 915 may determine whether a path loss reference signal corresponding to an uplink beam is configured. In some examples, UE configuration component 915 may identify the updated configuration based on the format of the DCI. In some examples, UE configuring component 915 may receive an RRC message including the configuration of the reference signal, wherein the first QCL parameter is indicated by a transmission configuration indicator state identifier within the RRC message. In some cases, the configuration indicates that the reference signal includes a semi-persistent CSI-RS or an aperiodic CSI-RS for beam failure detection.

The reference signal manager 920 may receive a first message indicating a first set of reference signal resources configured for a pathloss reference signal. In some examples, the reference signal manager 920 may receive a message indicating spatial relationship reference signals associated with uplink beams. In some examples, determining the reference signal includes periodic CSI-RS for beam failure detection. In some examples, determining the reference signal includes one or more of semi-persistent CSI-RS or aperiodic CSI-RS for beam failure detection.

In some examples, the reference signal manager 920 may overwrite the first set of reference signal resources with the second set of reference signal resources based on receiving the second message. In some examples, determining that the spatial relationship reference signal comprises a path loss reference signal based on determining that no path loss reference signal is configured, wherein the path loss estimate is for uplink power control.

In some cases, the reference signals include one or more of beam failure detection reference signals, periodic CSI-RS, or time/frequency tracking reference signals. In some cases, the first message comprises an RRC message for uplink power control. In some cases, the uplink power control includes one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control. In some cases, the spatial relationship reference signals correspond to a set of physical uplink control channel resources.

In some cases, the spatial relationship reference signal corresponds to a set of SRS resources indicated by the SRS resource indicator. In some cases, the uplink power control includes one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control. In some cases, the spatial relationship reference signal includes one or more of a synchronization signal block, a CSI-RS, or a SRS.

The monitoring component 925 may monitor the spatial relationship reference signal for path loss estimation based on determining that no path loss reference signal is configured. In some examples, monitoring component 925 may monitor the reference signal based on the second QCL parameter. Path loss component 930 may estimate the path loss for the uplink bandwidth portion based on a second set of reference signal resources associated with the path loss reference signal. In some cases, the path-loss reference signal includes one or more of a CSI-RS or a synchronization signal block.

Fig. 10 shows a diagram of a system 1000 including a device 1005 that supports techniques for updating reference signals, in accordance with aspects of the present disclosure. Apparatus 1005 may be an example of or include components of apparatus 705, apparatus 805, or UE115 as described herein. The device 1005 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1010, an I/O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may be in electronic communication via one or more buses, such as bus 1045.

The communication manager 1010 may: the method further includes identifying a configuration of first QCL parameters associated with the set of control resources and the reference signal, and receiving an updated configuration of the reference signal via one or more of the MAC-CE or the DCI based on a change in the first QCL parameters associated with the set of control resources, the updated configuration indicating that the second QCL parameters are configured for the reference signal.

The communication manager 1010 may also: the apparatus generally includes means for receiving a first message indicating a first set of reference signal resources configured for pathloss reference signals, and means for receiving a second message indicating a second set of reference signal resources configured for pathloss reference signals based on a change in the first set of reference signal resources, wherein the second message includes one or more of MAC-CE or DCI. The communication manager 1010 may also: the method includes receiving a message indicating spatial relationship reference signals associated with an uplink beam, determining whether a pathloss reference signal corresponding to the uplink beam is configured, and monitoring the spatial relationship reference signals for pathloss estimation based on determining that no pathloss reference signal is configured.

I/O controller 1015 may manage input and output signals of device 1005. I/O controller 1015 may also manage peripheral devices that are not integrated into device 1005. In some cases, I/O controller 1015 may represent a physical connection or port to an external peripheral component. In some cases, I/O controller 1015 may utilize a signal such asMS-MS-OS/Or other known operating systems. In other situationsIn the case, the I/O controller 1015 may represent or interact with a modem, a keyboard, a mouse, a touch screen, or the like. In some cases, the I/O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with device 1005 via I/O controller 1015 or via hardware components controlled by I/O controller 1015.

The transceiver 1020 may communicate bi-directionally via one or more antennas, wired or wireless links, as described herein. For example, transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, and demodulate packets received from the antennas. In some cases, a wireless device may include a single antenna 1025. However, in some cases, a device may have more than one antenna 1025 capable of sending or receiving multiple wireless transmissions simultaneously.

Memory 1030 may include RAM and ROM. The memory 1030 may store computer-readable computer-executable code 1035 comprising instructions that, when executed, cause the processor to perform various functions described herein. In some cases, memory 1030 may contain a basic input/output system (BIOS), or the like, that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 1040 may include intelligent hardware devices (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to operate the memory array using a memory controller. In other cases, a memory controller may be integrated into processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks that support techniques for updating reference signals).

Code 1035 may include instructions for implementing aspects of the disclosure, including instructions for supporting wireless communications. Code 1035 may be stored in a non-transitory computer-readable medium, such as a system memory or other memory. In some cases, code 1035 may not be directly executable by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 11 shows a block diagram 1100 of a device 1105 supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The device 1105 may be an example of aspects of a base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1120. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 1110 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, information related to techniques for updating reference signals, etc.). Information may be passed to other components of the device 1105. The receiver 1110 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Receiver 1110 can utilize a single antenna or a group of antennas.

The communication manager 1115 may: the apparatus generally includes means for determining a configuration of first QCL parameters associated with a set of control resources and a reference signal, means for determining that the first QCL parameters associated with the set of control resources have changed to second QCL parameters different from the first QCL parameters, means for identifying an updated configuration of the reference signal based on the change in the first QCL parameters associated with the set of control resources, means for configuring the reference signal with the second QCL parameters, and means for transmitting the updated configuration of the reference signal via one or more of MAC-CE or DCI.

The communication manager 1115 may also: the apparatus generally includes means for transmitting a first message indicating a first set of reference signal resources configured for pathloss reference signals, means for determining that the first set of reference signal resources has changed to a second set of reference signal resources, and means for transmitting a second message indicating the second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing, wherein the second message may include one or more of MAC-CE or DCI. The communication manager 1115 may also transmit a message indicating a spatial relationship reference signal associated with the uplink beam, and determine that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation. The communication manager 1115 may be an example of aspects of the communication manager 634 and/or the communication manager 1410 described herein.

The communication manager 1115, 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 1115, or subcomponents thereof, may be performed by a general purpose processor, a DSP, an Application Specific Integrated Circuit (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 in this disclosure.

The communication manager 1115, or subcomponents thereof, may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical devices at different physical locations. In some examples, the communication manager 1115, or subcomponents thereof, may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 1315 or subcomponents thereof may be combined with one or more other hardware components, including but not limited to input/output (I/O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof, in accordance with various aspects of the present disclosure.

The transmitter 1120 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1120 may be collocated with the receiver 1110 in a transceiver module. For example, the transmitter 1120 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Transmitter 1120 may utilize a single antenna or a group of antennas.

Fig. 12 shows a block diagram 1200 of an apparatus 1205 that supports techniques for updating reference signals in accordance with aspects of the present disclosure. Device 1205 may be an example of aspects of device 1105 or base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1240. The device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 1210 can receive information such as packets associated with various information channels (e.g., control channels, data channels, and information related to techniques for updating reference signals, etc.), user data, or control information. Information may be passed to other components of the device 1205. The receiver 1210 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Receiver 1210 can utilize a single antenna or a group of antennas.

The communication manager 1215 may be an example of aspects of the communication manager 1115 as described herein. The communications manager 1215 may include a QCL configuration manager 1220, a reference signal configuration manager 1225, a configuration signaling component 1230, and a reference signal resource manager 1235. The communication manager 1215 may be an example of aspects of the communication manager 1410 described herein.

QCL configuration manager 1220 may: the method further includes determining a configuration of first QCL parameters associated with the set of control resources and the reference signal, and determining that the first QCL parameters associated with the set of control resources have changed to second QCL parameters different from the first QCL parameters.

The reference signal configuration manager 1225 may identify an updated configuration of the reference signal based on a change in the first QCL parameter associated with the set of control resources, the updated configuration configuring the reference signal with the second QCL parameter. Configuration signaling component 1230 may transmit the updated configuration of reference signals via one or more of MAC-CE or DCI.

The reference signal resource manager 1235 may: the method may include transmitting a first message indicating a first set of reference signal resources configured for a pathloss reference signal and determining that the first set of reference signal resources has changed to a second set of reference signal resources.

Configuration signaling means 1230 may: transmitting a second message indicating a second set of reference signal resources configured for a pathloss reference signal based on the first set of reference signal resources changing, wherein the second message may include one or more of a MAC-CE or a DCI.

Configuration signaling component 1230 may send a message indicating spatial relationship reference signals associated with the uplink beam. The reference signal configuration manager 1225 may determine that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation.

A transmitter 1240 may transmit signals generated by other components of the device 1205. In some examples, the transmitter 1240 may be collocated with the receiver 1210 in a transceiver module. For example, the transmitter 1240 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Transmitter 1240 may utilize a single antenna or a group of antennas.

Fig. 13 illustrates a block diagram 1300 of a communication manager 1305 that supports techniques for updating reference signals, in accordance with aspects of the present disclosure. The communications manager 1305 may be an example of aspects of the communications manager 1115, the communications manager 1215, or the communications manager 1410 described herein. The communications manager 1305 may include a QCL configuration manager 1310, a reference signal configuration manager 1315, a configuration signaling component 1320, a reference signal component 1325, and a reference signal resource manager 1330. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

QCL configuration manager 1310 may determine a configuration of first QCL parameters associated with a set of control resources and a reference signal. In some examples, QCL configuration manager 1310 may determine that a first QCL parameter associated with a set of control resources has changed to a second QCL parameter different from the first QCL parameter. In some cases, the reference signals include one or more of beam failure detection reference signals, periodic CSI-RS, or time/frequency tracking reference signals.

The reference signal configuration manager 1315 may identify an updated configuration of the reference signal based on a change in a first QCL parameter associated with the set of control resources, the updated configuration configuring the reference signal with a second QCL parameter. In some examples, the reference signal configuration manager 1315 may determine that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation.

In some examples, the reference signal configuration manager 1315 may select a periodic CSI-RS as the reference signal, wherein the configuration indicates that the periodic CSI-RS is used for beam failure detection. In some examples, the reference signal configuration manager 1315 may select one or more of a semi-persistent CSI-RS or an aperiodic CSI-RS as the reference signal, where the configuration indicates that one or more of the semi-persistent CSI-RS or aperiodic CSI-RS is used for beam failure detection.

Configuration signaling component 1320 may transmit the updated configuration of the reference signal via one or more of MAC-CE or DCI. In some examples, a second message indicating a second set of reference signal resources configured for pathloss reference signals is transmitted based on the first set of reference signal resources changing, wherein the second message may include one or more of MAC-CE or DCI.

In some examples, configuration signaling component 1320 may transmit a message indicating spatial relationship reference signals associated with an uplink beam. In some examples, configuration signaling component 1320 may transmit an RRC message including the configuration of the reference signal, wherein the first QCL parameter is indicated by a transmission configuration indicator state identifier within the RRC message.

In some cases, the format of the DCI indicates that the reference signal is configured with the second QCL parameter. In some cases, the spatial relationship reference signals correspond to a set of physical uplink control channel resources. In some cases, the spatial relationship reference signal corresponds to a set of SRS resources indicated by the SRS resource indicator.

The reference signal resource manager 1330 may send a first message indicating a first set of reference signal resources configured for a pathloss reference signal. In some examples, the reference signal resource manager 1330 may determine that the first set of reference signal resources has changed to the second set of reference signal resources. In some cases, the second set of reference signal resources overwrites the first set of reference signal resources. In some cases, the first message comprises an RRC message for uplink power control. In some cases, the uplink power control includes one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control. Reference signal component 1325 can transmit reference signals according to the updated configuration.

Fig. 14 shows a diagram of a system 1400 including a device 1405 supporting techniques for updating reference signals, in accordance with aspects of the present disclosure. Device 1405 may be a component of or include a component of device 1105, device 1205, or base station 105 as described herein. Device 1405 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1410, a network communications manager 1415, a transceiver 1420, an antenna 1425, a memory 1430, a processor 1440, and an inter-station communications manager 1445. These components may be in electronic communication via one or more buses, such as bus 1450.

The communication manager 1410 may: determining a configuration of first QCL parameters associated with a control resource set and a reference signal, determining that the first QCL parameters associated with the control resource set have changed to second QCL parameters different from the first QCL parameters, identifying an updated configuration of the reference signal based on the change in the first QCL parameters associated with the control resource set, the updated configuration configuring the reference signal with the second QCL parameters, and transmitting the updated configuration of the reference signal via one or more of MAC-CE or DCI

The communication manager 1410 may also: the apparatus generally includes means for transmitting a first message indicating a first set of reference signal resources configured for pathloss reference signals, means for determining that the first set of reference signal resources has changed to a second set of reference signal resources, and means for transmitting a second message indicating the second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing, wherein the second message includes one or more of MAC-CE or DCI. The communication manager 1410 may also: transmitting a message indicating a spatial relationship reference signal associated with the uplink beam, and determining that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation.

The network communication manager 1415 may manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1415 may manage the transmission of data communications for client devices (such as one or more UEs 115).

As described above, the transceiver 1420 may communicate bi-directionally via one or more antennas, wired or wireless links. For example, transceiver 1420 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1420 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas. In some cases, the wireless device may include a single antenna 1425. However, in some cases, a device may have more than one antenna 1425, which is capable of sending or receiving multiple wireless transmissions simultaneously.

Memory 1430 may include RAM, ROM, or a combination thereof. Memory 1430 may store computer readable code 1435 including instructions that, when executed by a processor (e.g., processor 1440), cause the device to perform various functions described herein. In some cases, memory 1430 may contain a BIOS or the like, which may control basic hardware or software operations such as interaction with peripheral components or devices.

Processor 1440 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 1440 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks that support techniques for updating reference signals).

The inter-station communication manager 1445 may manage communications with other base stations 105 and may include a controller or scheduler to control communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communication manager 1445 may coordinate scheduling of transmissions to UEs 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-station communication manager 1445 may provide an X2 interface within LTE/LTE-a wireless communication network technology to provide communication between base stations 105.

The code 1435 may include instructions for implementing aspects of the present disclosure, including instructions to support wireless communications. The code 1435 may be stored in a non-transitory computer-readable medium, such as system memory or other memory. In some cases, code 1435 may not be directly executable by processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 15 shows a flow diagram illustrating a method 1500 of supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The operations of method 1500 may be performed by UE115 or components thereof described herein. For example, the operations of method 1500 may be performed by a communication manager as described with reference to fig. 7-10. In some examples, the UE may execute the set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may perform aspects of the functions described herein using dedicated hardware.

At 1505, the UE may identify a configuration of first QCL parameters associated with a set of control resources and a reference signal. 1505 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1505 may be performed by the QCL manager described with reference to fig. 7-10.

At 1510, the UE may receive an updated configuration of reference signals via one or more of the MAC-CE or the DCI based on a change in the first QCL parameter associated with the set of control resources, the updated configuration indicating that the second QCL parameter is configured for the reference signals. 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by the UE configuration component described with reference to fig. 7-10.

Fig. 16 shows a flow diagram illustrating a method 1600 of supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The operations of method 1600 may be performed by UE115 or components thereof described herein. For example, the operations of method 1600 may be performed by a communication manager as described with reference to fig. 7-10. In some examples, the UE may execute the set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may perform aspects of the functions described herein using dedicated hardware.

At 1605, the UE may receive a first message indicating a first set of reference signal resources configured for a path loss reference signal. 1605 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1605 may be performed by the reference signal manager described with reference to fig. 7-10.

At 1610, the UE may receive a second message indicating a second set of reference signal resources configured for a pathloss reference signal based on the first set of reference signal resources changing, wherein the second message includes one or more of MAC-CE or DCI. 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by the UE configuration component described with reference to fig. 7-10.

Fig. 17 shows a flow diagram illustrating a method 1700 of supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by UE115 or components thereof described herein. For example, the operations of method 1700 may be performed by a communication manager as described with reference to fig. 7-10. In some examples, the UE may execute the set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may perform aspects of the functions described herein using dedicated hardware.

At 1705, the UE may receive a message indicating a spatial relationship reference signal associated with an uplink beam. 1705 may be performed according to the methods described herein. In some examples, aspects of the operation of 1705 may be performed by the reference signal manager described with reference to fig. 7-10.

At 1710, the UE may determine whether a path loss reference signal corresponding to the uplink beam is configured. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by the UE configuration component described with reference to fig. 7-10.

At 1715, the UE may monitor the spatial relationship reference signals for path loss estimation based on determining that no path loss reference signals are configured. 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by the monitoring component described with reference to fig. 7-10.

Fig. 18 shows a flow diagram illustrating a method 1800 of supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The operations of method 1800 may be performed by the base station 105 or components thereof described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to fig. 11-14. In some examples, the base station may execute sets of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functionality described herein.

At 1805, the base station can determine a configuration of first QCL parameters associated with the set of control resources and the reference signal. 1805 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1805 may be performed by the QCL configuration manager described with reference to fig. 11-14.

At 1810, the base station may determine that a first QCL parameter associated with a set of control resources has changed to a second QCL parameter different from the first QCL parameter. 1810 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1810 may be performed by the QCL configuration manager described with reference to fig. 11-14.

At 1815, the base station may identify an updated configuration of the reference signal based on a change in the first QCL parameter associated with the set of control resources, the updated configuration configuring the reference signal with the second QCL parameter. 1815 may be performed according to the methods described herein. In some examples, aspects of the operation of 1815 may be performed by the reference signal configuration manager described with reference to fig. 11-14.

At 1820, the base station may transmit the updated configuration of reference signals via one or more of MAC-CE or DCI. 1820 the operations may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed by the configuration signaling component described with reference to fig. 11-14.

Fig. 19 shows a flow diagram illustrating a method 1900 of supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The operations of method 1900 may be performed by the base station 105 or components thereof described herein. For example, the operations of method 1900 may be performed by a communication manager as described with reference to fig. 11-14. In some examples, the base station may execute sets of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functionality described herein.

At 1905, the base station can transmit a first message indicating a first set of reference signal resources configured for a pathloss reference signal. 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by the reference signal resource manager described with reference to fig. 11-14.

At 1910, the base station can determine that the first set of reference signal resources has changed to a second set of reference signal resources. 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by a reference signal resource manager described with reference to fig. 11-14.

At 1915, the base station may transmit a second message indicating a second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing, where the second message may include one or more of MAC-CE or DCI. 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by the configuration signaling component described with reference to fig. 11-14.

Fig. 20 shows a flow diagram illustrating a method 2000 of supporting techniques for updating reference signals in accordance with aspects of the present disclosure. The operations of method 2000 may be performed by base station 105 or components thereof described herein. For example, the operations of method 2000 may be performed by a communication manager as described with reference to fig. 11-14. In some examples, the base station may execute sets of instructions to control the functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functionality described herein.

At 2005, a base station can transmit a message indicating spatial relationship reference signals associated with an uplink beam. 2005 may be performed according to the methods described herein. In some examples, aspects of the operation of 2005 may be performed by the configuration signaling component described with reference to fig. 11-14.

At 2010, the base station may determine that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation. The operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by the reference signal configuration manager described with reference to fig. 11-14.

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

Aspects of the following examples may be combined with any of the previous examples or aspects described herein. For example, example 1 is a method for wireless communication, comprising: the method further includes identifying a configuration of the first QCL parameter associated with the CORESET and the reference signal, and receiving an updated configuration of the reference signal via one or more of the MAC-CE or the DCI based on a change in the first QCL parameter associated with the CORESET, the updated configuration indicating that the second QCL parameter is configured for the reference signal.

In example 2, the method of example 1 may include: determining that the reference signal comprises a periodic CSI-RS for beam failure detection.

In example 3, the method of examples 1-2 may include: determining that the reference signal includes one or more of a semi-persistent CSI-RS or an aperiodic CSI-RS for beam failure detection.

In example 4, the method of examples 1-3 may include: the configuration indicates that the reference signals include semi-persistent CSI-RS or aperiodic CSI-RS for beam failure detection.

In example 5, the method of examples 1-4 may include: the reference signals include one or more of BFD-RS, periodic CSI-RS, or time/frequency Tracking Reference Signals (TRSs).

In example 6, the method of examples 1-5 may include: it is determined that the first QCL parameter associated with CORESET may have been changed to the second QCL parameter.

In example 7, the method of examples 1-6 may include: the updated configuration is identified based on a format of the DCI.

In example 8, the method of examples 1-7 may include: monitoring the reference signal based on the second QCL parameter.

In example 9, the method of examples 1-8 may include: receiving an RRC message comprising the configuration of the reference signal, wherein the first QCL parameters may be indicated by a transmission configuration indicator state identifier within the RRC message.

Example 10 is a method for wireless communication, comprising: the apparatus generally includes means for receiving a first message indicating a first set of reference signal resources configured for pathloss reference signals, and means for receiving a second message indicating a second set of reference signal resources configured for pathloss reference signals based on a change in the first set of reference signal resources, wherein the second message includes one or more of MAC-CE or DCI.

In example 11, the method of example 10 may include: the method further includes overwriting the first set of reference signal resources with a second set of reference signal resources based on receiving the second message, and estimating a pathloss for the portion of uplink bandwidth based on the second set of reference signal resources associated with the pathloss reference signal.

In example 12, the method of examples 10-11 may include: the first message includes an RRC message for uplink power control.

In example 13, the method of examples 10-12 may include: the uplink power control includes one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control.

In example 14, the method of examples 10-13 may include: the path loss reference signal includes one or more of a CSI-RS or an SSB.

Example 15 is a method for wireless communication, comprising: the method includes receiving a message indicating spatial relationship reference signals associated with an uplink beam, determining whether a pathloss reference signal corresponding to the uplink beam is configured, and monitoring the spatial relationship reference signals for pathloss estimation based on determining that no pathloss reference signal is configured.

In example 16, the method of example 15 may include: determining that the spatial relationship reference signal comprises a path loss reference signal based on determining that the path loss reference signal may not be configured, wherein the path loss estimate may be used for uplink power control.

In example 17, the method of examples 15-16 may include: the spatial relationship reference signals correspond to a set of physical uplink control channel resources.

In example 18, the method of examples 15-17 may include: the spatial relationship reference signals correspond to sets of SRS resources indicated by the SRS resource indicator.

In example 19, the method of examples 15-18 may include: the uplink power control includes one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control.

In example 20, the method of examples 15-19 may include: the spatial relationship reference signal includes one or more of an SSB, a CSI-RS, or an SRS.

Example 21 is a method for wireless communication, comprising: the apparatus generally includes means for determining a configuration of first QCL parameters associated with the CORESET and a reference signal, means for determining that the first QCL parameters associated with the CORESET have changed to second QCL parameters different from the first QCL parameters, means for identifying an updated configuration of the reference signal based on the change in the first QCL parameters associated with the CORESET, means for configuring the reference signal with the second QCL parameters, and means for transmitting the updated configuration of the reference signal via one or more of MAC-CE or DCI.

In example 22, the method of example 21 may include: selecting a periodic CSI-RS as the reference signal, wherein the configuration indicates that the periodic CSI-RS can be used for beam failure detection.

In example 23, the method of examples 21-22 may include: selecting one or more of a semi-persistent CSI-RS or an aperiodic CSI-RS as the reference signal, wherein the configuration indicates that the one or more of the semi-persistent CSI-RS or the aperiodic CSI-RS can be used for beam failure detection.

In example 24, the method of examples 21-23 may include: the format indication of the DCI configures the reference signal with the second QCL parameter.

In example 25, the method of examples 21-24 may include: the reference signals include one or more of BFD-RS, periodic CSI-RS, or time/frequency tracking reference signals.

In example 26, the method of examples 21-25 may include transmitting the reference signal according to the updated configuration.

In example 27, the method of examples 21-26 may include: transmitting an RRC message including the configuration of the reference signal, wherein the first QCL parameters may be indicated by a transmission configuration indicator state identifier within the RRC message.

Example 28 is a method for wireless communication, comprising: the apparatus generally includes means for transmitting a first message indicating a first set of reference signal resources configured for pathloss reference signals, means for determining that the first set of reference signal resources has changed to a second set of reference signal resources, and means for transmitting a second message indicating the second set of reference signal resources configured for pathloss reference signals based on the first set of reference signal resources changing, wherein the second message may include one or more of MAC-CE or DCI.

In example 29, the method of example 28 may include: the second set of reference signal resources overwrites the first set of reference signal resources.

In example 30, the method of examples 28-29 may include: the first message includes an RRC message for uplink power control.

In example 31, the method of examples 28-30 may include: the uplink power control includes one or more of physical uplink control channel power control, physical uplink shared channel power control, or SRS power control.

Example 32 is a method for wireless communication, comprising: transmitting a message indicating a spatial relationship reference signal associated with the uplink beam, and determining that no path loss reference signal corresponding to the uplink beam is configured, wherein based on the determination, the spatial relationship reference signal is used for path loss estimation.

In example 33, the method of example 32 may include: the spatial relationship reference signals correspond to a set of physical uplink control channel resources.

In example 34, the method of examples 32-33 may include: the spatial relationship reference signals correspond to sets of SRS resources indicated by the SRS resource indicator.

Example 35 is a system or apparatus comprising means for implementing the method or implementing the apparatus of any of examples 1-34.

Example 36 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to perform the method of any one of examples 1-34.

Example 37 is a system comprising one or more processors and memory in electronic communication with the one or more processors, the memory storing instructions executable by the one or more processors to cause the system or apparatus to perform the method of any of examples 1-34.

The techniques described herein may be used for various wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and others. 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 commonly referred to as CDMA 20001X, 1X, etc. IS-856(TIA-856) IS commonly referred to as CDMA 20001 xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes wideband CDMA (wcdma) 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 Pro are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, LTE-APro, NR, and GSM are described in a document entitled "third Generation partnership project" (3GPP) organization. CDMA2000 and UMB are described in a document entitled "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. While various aspects of an LTE, LTE-A, LTE-A Pro or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro or NR terminology may be used in much of the description, the techniques described herein may be applied beyond LTE, LTE-A, LTE-A Pro 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 a different (e.g., licensed, unlicensed, etc.) frequency band than 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 smaller 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 home) and may provide restricted access for UEs having association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in the home, etc.). The eNB for the 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, the 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 operations or asynchronous operations.

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 above 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 description 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 embodiments 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-wired, or a combination of any of these. Features implementing functions may also be physically located in multiple locations, including portions distributed such that functions are implemented in 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. A non-transitory storage medium may be any available medium 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 Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (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. Also, 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, "or" as used in a list of items (e.g., a list of items prefaced by a phrase such as "at least one" or "one or more") indicates an inclusive list such that, for example, a list of at least one of A, B or C represents a or B or C or AB or AC or BC or ABC (i.e., a and B and C). Also, 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 condition a and condition B without departing from the scope of the present disclosure. That is, as used herein, the phrase "based on" will be interpreted in the same manner as the phrase "based, at least in part, on".

In the drawings, similar components or features may have the same reference numerals. Further, multiple 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 numeral is used in the specification, the description is applicable to any one of the similar components having the same first reference numeral regardless of the second or other subsequent reference numeral.

The description set forth herein in connection with the appended drawings describes example configurations, but is not intended to represent all examples that may be practiced or within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "superior to other examples. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these 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 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 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.