阅读说明：本技术 使用非授权频谱新无线电中的宽带传输的多信道先听后说 (Multi-channel listen-before-talk using wideband transmission in unlicensed spectrum new radios ) 是由 S.A.A.法库里安 张晓霞 J.孙 于 2019-09-30 设计创作，主要内容包括：本公开的各个方面总体上涉及无线通信。在一些方面,一种无线通信设备可以：在非授权频谱的宽带信道中的多个信道之中,在每信道的基础上执行多个传输块中的每个传输块的编码比特的速率匹配。速率匹配在第一时隙集合中在每信道的基础上执行,以使得将每个传输块的编码比特映射到多个信道中的相应一个信道。该无线通信设备可以在多个传输块在多个信道上的传输之后接收每信道确认信息。该无线通信设备可以选择性地调整多个竞争窗口,每个竞争窗口与要在多个信道中的相应一个信道上执行的先听后说过程相关联。提供了许多其他方面。(Aspects of the present disclosure generally relate to wireless communications. In some aspects, a wireless communication device may: rate matching of coded bits of each of a plurality of transport blocks is performed on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum. Rate matching is performed on a per-channel basis in the first set of time slots such that coded bits of each transport block are mapped to a respective one of the plurality of channels. The wireless communication device may receive per-channel acknowledgement information after transmission of the plurality of transport blocks over the plurality of channels. The wireless communication device may selectively adjust a plurality of contention windows, each contention window associated with a listen-before-talk procedure to be performed on a respective one of a plurality of channels. Numerous other aspects are provided.)

1. A method of wireless communication performed by a wireless communication device, comprising:

performing rate matching of coded bits of each transport block of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum,

wherein the rate matching is performed on the per-channel basis in a first set of time slots of a transmission opportunity, and

wherein the rate matching of coded bits is performed such that coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels;

based at least in part on performing the rate matching on the per-channel basis and receiving per-channel acknowledgement information associated with the plurality of channels after transmission of the plurality of transport blocks over the plurality of channels; and

selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with a listen-before-talk, LBT, procedure to be performed on a respective one of the plurality of channels.

2. The method of claim 1, wherein the transmission is a Physical Downlink Shared Channel (PDSCH) transmission.

3. The method of claim 1, wherein a plurality of grants are provided to another wireless communication device, each grant being associated with a respective one of the plurality of transport blocks.

4. The method of claim 1, wherein a single grant associated with each of the plurality of transport blocks is provided to another wireless communication device.

5. The method of claim 1, wherein a contention window of the plurality of contention windows and associated with the channel is selectively adjusted based at least in part on acknowledgement information associated with a subsequent transmission when puncturing a channel of the plurality of channels associated with sending the transmission.

6. A method of wireless communication performed by a wireless communication device, comprising:

receiving measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum,

wherein the measurement information comprises, for each channel of the plurality of channels, information associated with a respective signal-to-noise ratio, SNR, measurement or a respective interference measurement; and

selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window associated with a listen before talk, LBT, procedure to be performed on a respective one of the plurality of channels.

7. The method of claim 6, wherein the SNR measurement is based at least in part on a measurement of a demodulation reference Signal (DMRS).

8. The method of claim 6, in which the interference measurement is based at least in part on a measurement of an interference measurement resource, channel state information reference signal, IMR-CSI-RS.

9. A method of wireless communication performed by a wireless communication device, comprising:

performing Wireless Local Area Network (WLAN) preamble detection for each of a plurality of channels in a wideband channel of an unlicensed spectrum; and

selectively adjusting a bandwidth associated with a listen before talk, LBT, procedure based at least in part on a result of performing the WLAN preamble detection for each of the plurality of channels.

10. The method of claim 9, wherein information identifying the bandwidth associated with the LBT procedure is signaled to another wireless communication device.

11. A wireless communication device for wireless communication, comprising:

a memory; and

one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:

performing rate matching of coded bits of each transport block of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum,

wherein the rate matching is performed on the per-channel basis in a first set of time slots of a transmission opportunity, and

wherein the rate matching of coded bits is performed such that coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels;

based at least in part on performing the rate matching on the per-channel basis and receiving per-channel acknowledgement information associated with the plurality of channels after transmission of the plurality of transport blocks over the plurality of channels; and is

Selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with a listen-before-talk, LBT, procedure to be performed on a respective one of the plurality of channels.

12. The wireless communication device of claim 11, wherein the transmission is a Physical Downlink Shared Channel (PDSCH) transmission.

13. The wireless communication device of claim 11, wherein a plurality of grants are provided to another wireless communication device, each grant being associated with a respective one of the plurality of transport blocks.

14. The wireless communication device of claim 11, wherein a single grant associated with each of the plurality of transport blocks is provided to another wireless communication device.

15. The wireless communication device of claim 11, wherein, when puncturing a channel of the plurality of channels associated with sending the transmission, a contention window of the plurality of contention windows and associated with the channel is selectively adjusted based at least in part on acknowledgement information associated with a subsequent transmission.

Technical Field

Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for multi-channel listen-before-talk (LBT) for wideband transmissions in new radios (NR-U) using unlicensed spectrum.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the third Generation partnership project (3 GPP).

A wireless communication network may include multiple Base Stations (BSs) that may support communication for multiple User Equipments (UEs). A User Equipment (UE) may communicate with a Base Station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in greater detail herein, a BS may be referred to as a node B, gNB, an Access Point (AP), a radio head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G node B, etc.

The above-described multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. A New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the third generation partnership project (3 GPP). NR is designed to better support mobile broadband internet access by: improve spectral efficiency, reduce cost, improve service, utilize new spectrum, and better integrate with other open standards using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) (CP-OFDM) on the Downlink (DL) and CP-OFDM and/or SC-FDM (e.g., also known as discrete fourier transform spread OFDM (DFT-s-OFDM)) on the Uplink (UL), as well as support for beamforming, Multiple Input Multiple Output (MIMO) antenna techniques, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, further improvements in LTE and NR technologies are needed. Preferably, these improvements should be applicable to other multiple access techniques and telecommunications standards employing these techniques.

Disclosure of Invention

In some aspects, a method of wireless communication performed by a wireless communication device may comprise: performing rate matching of coded bits of each of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of timeslots of a transmission opportunity, and wherein the rate matching of coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels; receiving per-channel acknowledgement information associated with a plurality of channels based at least in part on performing rate matching on a per-channel basis and after transmission of a plurality of transport blocks over the plurality of channels; and selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with a Listen Before Talk (LBT) procedure to be performed on a respective one of the plurality of channels.

In some aspects, a wireless communication device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: performing rate matching of coded bits of each of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of timeslots of a transmission opportunity, and wherein the rate matching of coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels; receiving per-channel acknowledgement information associated with a plurality of channels based at least in part on performing rate matching on a per-channel basis and after transmission of a plurality of transport blocks over the plurality of channels; and selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by the one or more processors of the wireless communication device, may cause the one or more processors to: performing rate matching of coded bits of each of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of timeslots of a transmission opportunity, and wherein the rate matching of coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels; receiving per-channel acknowledgement information associated with a plurality of channels based at least in part on performing rate matching on a per-channel basis and after transmission of a plurality of transport blocks over the plurality of channels; and selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels.

In some aspects, an apparatus for wireless communication may comprise: means for performing rate matching of coded bits of each of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of timeslots of a transmission opportunity, and wherein the rate matching of the coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels; means for receiving per-channel acknowledgement information associated with a plurality of channels after transmission of a plurality of transport blocks over the plurality of channels based at least in part on performing rate matching on a per-channel basis; and means for selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels.

In some aspects, a method of wireless communication performed by a wireless communication device may comprise: receiving measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective signal-to-noise ratio (SNR) measurement or a respective interference measurement; and selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window being associated with an LBT procedure to be performed on a respective one of the plurality of channels.

In some aspects, a wireless communication device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receiving measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective SNR measurement or a respective interference measurement; and selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window being associated with an LBT procedure to be performed on a respective one of the plurality of channels.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by the one or more processors of the wireless communication device, may cause the one or more processors to: receiving measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective SNR measurement or a respective interference measurement; and selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window being associated with an LBT procedure to be performed on a respective one of the plurality of channels.

In some aspects, an apparatus for wireless communication may comprise: means for receiving measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective SNR measurement or a respective interference measurement; and means for selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels. In some aspects, a method of wireless communication performed by a wireless communication device may comprise: performing Wireless Local Area Network (WLAN) preamble detection for each of a plurality of channels in a wideband channel of an unlicensed spectrum; and selectively adjust a bandwidth associated with the LBT procedure based at least in part on a result of performing WLAN preamble detection for each of the plurality of channels.

In some aspects, a wireless communication device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: performing WLAN preamble detection for each of a plurality of channels in a wideband channel of an unlicensed spectrum; and selectively adjust a bandwidth associated with the LBT procedure based at least in part on a result of performing WLAN preamble detection for each of the plurality of channels.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by the one or more processors of the wireless communication device, may cause the one or more processors to: performing WLAN preamble detection for each of a plurality of channels in a wideband channel of an unlicensed spectrum; and selectively adjust a bandwidth associated with the LBT procedure based at least in part on a result of performing WLAN preamble detection for each of the plurality of channels.

In some aspects, an apparatus for wireless communication may comprise: means for performing WLAN preamble detection for each of a plurality of channels in a wideband channel of an unlicensed spectrum; and means for selectively adjusting a bandwidth associated with the LBT procedure based at least in part on a result of performing WLAN preamble detection for each of the plurality of channels.

Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and/or processing systems substantially as described herein with reference to and as illustrated by the accompanying drawings and description.

The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the presently disclosed concepts, both as to its organization and method of operation, together with related advantages, will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description and is not intended as a definition of the limits of the claims.

Drawings

So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

Fig. 2 is a block diagram conceptually illustrating an example of a base station communicating with User Equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 3A is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 3B is a block diagram conceptually illustrating an example synchronous communication hierarchy in a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 4 is a block diagram conceptually illustrating an example slot format with a conventional cyclic prefix, in accordance with various aspects of the present disclosure.

Fig. 5 is a diagram illustrating an example of a Downlink (DL) -centric time slot in accordance with various aspects of the present disclosure.

Fig. 6 is a diagram illustrating an example of an Uplink (UL) -centric time slot in accordance with various aspects of the disclosure.

Fig. 7 is a diagram illustrating an example of receiving acknowledgement information on a per-channel basis such that contention windows associated with LBT procedures for multiple channels of a wideband channel of an NR unlicensed spectrum may be selectively adjusted, in accordance with various aspects of the present disclosure.

Fig. 8 is a diagram illustrating an example process performed, for example, by a wireless communication device, in accordance with various aspects of the present disclosure.

Fig. 9 is a diagram illustrating the following example in accordance with various aspects of the present disclosure: measurement information associated with a plurality of channels of a wideband channel of an NR unlicensed spectrum is received and a contention window associated with an LBT procedure for the plurality of channels is selectively adjusted based at least in part on the measurement information.

Fig. 10 is a diagram illustrating an example process performed, for example, by a wireless communication device, in accordance with various aspects of the present disclosure.

Fig. 11 is a diagram illustrating the following example in accordance with various aspects of the present disclosure: wireless local area network preamble detection is performed on a plurality of channels of a wideband channel of the NR unlicensed spectrum, and a bandwidth of an LBT procedure associated with the wideband channel is selectively adjusted based at least in part on a result of the WLAN preamble detection.

Fig. 12 is a diagram illustrating an example process performed, for example, by a wireless communication device, in accordance with various aspects of the present disclosure.

Detailed description of the invention

Various aspects of the disclosure are described more fully below with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether implemented independently or in combination with any other aspect of the present disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. Additionally, the scope of the present disclosure is intended to cover such an apparatus or method as practiced using other structure, functionality, or structure and functionality in addition to or in addition to the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be implemented by one or more elements of a claim.

Several aspects of telecommunications systems will now be presented with reference to various devices and techniques. These apparatus and techniques are described in the following detailed description and are illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It is noted that although aspects may be described herein using terms commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure may be applied in other generation-based communication systems (such as 5G and progeny, including NR technologies).

Fig. 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced. The network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. Wireless network 100 may include a plurality of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with User Equipment (UE) and may also be referred to as a base station, NR BS, node B, gNB, 5G node b (nb), access point, Transmission Reception Point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a coverage area of a BS and/or a BS subsystem serving that coverage area, depending on the context in which the term is used.

The BS may provide communication coverage for a macro cell, pico cell, femto cell, and/or other types of cells. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). The BS for the macro cell may be referred to as a macro BS. The BS for the pico cell may be referred to as a pico BS. The BS for the femto cell may be referred to as a femto BS or a home BS. In the example shown in fig. 1, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102 c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "node B", "5G NB", and "cell" may be used interchangeably herein.

In some aspects, the cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of the mobile BS. In some aspects, BSs may be interconnected to each other and/or to one or more other BSs or network nodes (not shown) in the access network 100 by various types of backhaul interfaces, such as direct physical connections, virtual networks, and/or the like using any suitable transport network.

Wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of the data to a downstream station (e.g., the UE or the BS). The relay station may also be a UE capable of relaying transmissions for other UEs. In the example shown in fig. 1, relay 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120 d. A relay station may also be referred to as a relay BS, a relay base station, a relay, and so on.

The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, the macro BS may have a high transmit power level (e.g., 5 to 40 watts), while the pico BS, femto BS, and relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

Network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other, directly or indirectly, e.g., via a wireless or wired backhaul.

UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout wireless network 100, and each UE may be fixed or mobile. A UE may also be referred to as an access terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop, a cordless phone, a Wireless Local Loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor/device, a wearable device (smartwatch, smartclothing, smartglasses, a smartwristband, smartjewelry (e.g., smartring, smartband)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smartmeter/sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

Some UEs may be considered Machine Type Communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, and so forth, which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity for or to a network (e.g., a wide area network such as the internet or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered internet of things (IoT) devices and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered Customer Premises Equipment (CPE). UE 120 may be included within a housing that houses various components of UE 120, such as a processor component, a memory component, and the like.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. The frequencies may also be referred to as carriers, frequency channels, etc. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, the UE 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle networking (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, etc.), a mesh network, and/or the like. In this case, UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by base station 110.

As noted above, fig. 1 is provided as an example only. Other examples may differ from what is described with respect to fig. 1.

Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in fig. 1. The base station 110 may be equipped with T antennas 234a through 234T, while the UE 120 may be equipped with R antennas 252a through 252R, where T ≧ 1 and R ≧ 1 in general.

At base station 110, transmit processor 220 may receive data for one or more UEs from a data source 212, select one or more Modulation and Coding Schemes (MCSs) for each UE based at least in part on a Channel Quality Indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-Static Resource Partitioning Information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., Primary Synchronization Signals (PSS) and Secondary Synchronization Signals (SSS)). A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T Modulators (MODs) 232a through 232T. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232T may be transmitted via T antennas 234a through 234T, respectively. According to various aspects described in more detail below, a synchronization signal may be generated with position coding to convey additional information.

At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254R, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280. The channel processor may determine Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), Channel Quality Indicator (CQI), and the like. In some aspects, one or more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller/processor 280 (e.g., for reporting including RSRP, RSSI, RSRQ, CQI, etc.). Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 110. At base station 110, the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain the decoded data and control information sent by UE 120. Receive processor 238 may provide decoded data to a data sink 239 and decoded control information to controller/processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. Network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.

Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component of fig. 2 may perform one or more techniques associated with multi-channel LBT using wideband transmission in NR-U, as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component of fig. 2 may perform or direct operations such as process 800 of fig. 8, process 1000 of fig. 10, process 1200 of fig. 12, and/or other processes described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. A scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.

In some aspects, a wireless communication device (e.g., base station 110, UE 120) may include: means for performing rate matching of coded bits of each of a plurality of transport blocks on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of timeslots of a transmission opportunity, and wherein the rate matching of the coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels; means for receiving per-channel acknowledgement information associated with a plurality of channels after transmission of a plurality of transport blocks over the plurality of channels based at least in part on performing rate matching on a per-channel basis; means for selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels; and/or similar components in some aspects, such components may include one or more components of base station 110 described in conjunction with fig. 2 and/or one or more components of UE 120 described in conjunction with fig. 2.

In some aspects, a wireless communication device (e.g., base station 110, UE 120) may include: means for receiving measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective SNR measurement or a respective interference measurement; means for selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window associated with an LBT process to be performed on a respective one of the plurality of channels; and/or similar components in some aspects, such components may include one or more components of base station 110 described in conjunction with fig. 2 and/or one or more components of UE 120 described in conjunction with fig. 2.

In some aspects, a wireless communication device (e.g., base station 110, UE 120) may include: means for performing WLAN preamble detection for each of a plurality of channels in a wideband channel of an unlicensed spectrum; means for selectively adjusting a bandwidth associated with an LBT procedure based at least in part on a result of performing WLAN preamble detection for each of a plurality of channels; and/or the like. In some aspects, such components may include one or more components of base station 110 described in conjunction with fig. 2 and/or one or more components of UE 120 described in conjunction with fig. 2.

As noted above, fig. 2 is provided as an example only. Other examples may differ from what is described with respect to fig. 2.

Fig. 3A shows an example frame structure 300 for FDD in a telecommunication system (e.g., NR). The transmission timeline for each of the downlink and uplink may be divided into units of radio frames (also sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be divided into a set of Z (Z ≧ 1) subframes (e.g., indices of 0 to Z-1). Each subframe may have a predetermined duration (e.g., 1ms) and may include a set of slots (e.g., 2 per subframe is shown in fig. 3A^mA time slot, where m is a set of parameters for transmission, such as 0, 1, 2, 3, 4, etc.). Each slot may include a set of L symbol periods. For example, each slot may include fourteen symbol periods (e.g., as shown in fig. 3A), seven symbol periods, or another number of symbol periods. In the case where a subframe includes two slots (e.g., when m ═ 1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be allocated indices of 0 to 2L-1. In some aspects, scheduling units for FDD may be frame-based, subframe-based, slot-based, symbol-based, and so on.

Although some techniques are described herein in connection with frames, subframes, slots, etc., the techniques may be equally applicable to other types of wireless communication structures that may be referenced in the 5G NR using terms other than "frame," "subframe," "slot," etc. In some aspects, a wireless communication structure may refer to a communication unit of periodic time boundaries defined by a wireless communication standard and/or protocol. Additionally or alternatively, a configuration of a wireless communication structure different from that shown in fig. 3A may be used.

In some telecommunications (e.g., LTE), the base station may transmit a synchronization signal. For example, a base station may transmit a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), etc., on the downlink for each cell supported by the base station. The PSS and SSS may be used by the UE for cell search and acquisition. For example, PSS may be used by a UE to determine symbol timing, while SSS may be used by a UE to determine a physical cell identifier associated with a base station and frame timing. The base station may also transmit a Physical Broadcast Channel (PBCH). The PBCH may carry some system information, such as system information supporting initial access of the UE.

In some aspects, a base station may transmit a PSS, an SSs, and/or a PBCH according to a synchronization communication hierarchy (e.g., Synchronization Signal (SS) hierarchy) including a plurality of synchronization communications (e.g., SS blocks), as described below in connection with fig. 3B.

Fig. 3B is a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronous communication hierarchy. As shown in fig. 3B, the SS tier may include a set of SS bursts, which may include a plurality of SS bursts (identified as SS burst 0 through SS burst B-1, where B is the maximum number of repetitions of an SS burst that may be sent by a base station). As further shown, each SS burst may include one or more SS blocks (identified as SS block 0 through SS block (b)_{max_SS}-1), wherein b_{max_SS}-1 is the maximum number of SS blocks that can be carried by an SS burst). In some aspects, different SS blocks may be beamformed in different ways. The set of SS bursts may be transmitted by the wireless node periodically, such as every X milliseconds, as shown in fig. 3B. In some aspects, the set of SS bursts may have a fixed or dynamic length, as shown as Y milliseconds in fig. 3B.

The set of SS bursts shown in fig. 3B is an example of a set of synchronous communications, and other sets of synchronous communications may be used in conjunction with the techniques described herein. Moreover, the SS blocks shown in fig. 3B are examples of synchronous communications, and other synchronous communications may be used in conjunction with the techniques described herein.

In some aspects, SS blocks include resources that carry a PSS, SSs, PBCH, and/or other synchronization signals (e.g., a Third Synchronization Signal (TSS)) and/or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSs, and/or PBCH may be the same across each SS block of an SS burst. In some aspects, a single SS block may be included in an SS burst. In some aspects, the SS block may be at least four symbol periods in length, with each symbol carrying one or more of PSS (e.g., occupying one symbol), SSs (e.g., occupying one symbol), and/or PBCH (e.g., occupying two symbols).

In some aspects, the symbols of the SS blocks are consecutive, as shown in fig. 3B. In some aspects, the symbols of the SS blocks are non-consecutive. Similarly, in some aspects, one or more SS blocks of an SS burst may be transmitted in consecutive radio resources (e.g., consecutive symbol periods) during one or more time slots. Additionally or alternatively, one or more SS blocks of an SS burst may be transmitted in non-contiguous radio resources.

In some aspects, an SS burst may have a burst period, whereby SS blocks of the SS burst are transmitted by a base station according to the burst period. In other words, the SS blocks may be repeated during each SS burst. In some aspects, the set of SS bursts may have a burst set periodicity, whereby SS bursts of the set of SS bursts are transmitted by the base station according to a fixed burst set periodicity. In other words, the SS bursts may be repeated during each set of SS bursts.

The base station may transmit system information, such as System Information Blocks (SIBs), on a Physical Downlink Shared Channel (PDSCH) in certain time slots. The base station may send control information/data on a Physical Downlink Control Channel (PDCCH) in C symbol periods of a slot, where B may be configurable for each slot. The base station may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each slot.

As described above, fig. 3A and 3B are provided as examples. Other examples may differ from what is described with respect to fig. 3A and 3B.

Fig. 4 shows an example slot format 410 with a conventional cyclic prefix. The available time-frequency resources may be divided into resource blocks. Each resource block may cover a set of subcarriers (e.g., 12 subcarriers) in one slot and may include multiple resource elements. Each resource element may cover one subcarrier in one symbol period (e.g., in time) and may be used to transmit one modulation symbol, which may be a real or complex value.

For FDD in some telecommunication systems (e.g., NR), an interleaving structure may be used for each of the downlink and uplink. For example, Q interlaces may be defined with indices of 0 through Q-1, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include slots spaced apart by Q frames. Specifically, interlace Q may include slots Q, Q + Q, Q +2Q, etc., where Q ∈ {0, …, Q-1 }.

The UE may be located within the coverage of multiple BSs. One of the BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and so on. The received signal quality may be quantified by a signal-to-noise-and-interference ratio (SINR) or a Reference Signal Received Quality (RSRQ) or some other metric. The UE may operate in a dominant interference scenario where the UE may observe severe interference from one or more interfering BSs.

Although aspects of the examples described herein may be associated with NR or 5G technologies, aspects of the disclosure may be applicable to other wireless communication systems. A New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., other than an Orthogonal Frequency Division Multiple Access (OFDMA) -based air interface) or a fixed transport layer (e.g., other than an Internet Protocol (IP)). In aspects, NR may utilize OFDM with CP (referred to herein as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink and CP-OFDM on the downlink and include support for half-duplex operation using TDD. In aspects, the NR may utilize OFDM with CP on the uplink (referred to herein as CP-OFDM) and/or discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM), for example, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD. NR may include enhanced mobile broadband (eMBB) services targeting wide bandwidths (e.g., 80 megahertz (MHz) and above), millimeter waves (mmW) targeting high carrier frequencies (e.g., 60 gigahertz (GHz)), massive MTC (MTC) targeting non-backward compatible MTC technologies, and/or mission critical targeting ultra-reliable low latency communication (URLLC) services.

In some aspects, a single component carrier bandwidth of 100MHz may be supported. The NR resource blocks may span 12 subcarriers having a subcarrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1 millisecond (ms) duration. Each radio frame may include 40 slots and may have a length of 10 ms. Thus, each slot may have a length of 0.25 ms. Each time slot may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each time slot may be dynamically switched. Each slot may include DL/UL data as well as DL/UL control data.

Beamforming may be supported and beam directions may be dynamically configured. MIMO transmission with precoding may also be supported. MIMO configuration in DL can support up to 8 transmit antennas (multi-layer DL transmission with up to 8 streams) and up to 2 streams per UE. Multi-layer transmission of up to 2 streams per UE may be supported. Up to 8 serving cells may be used to support aggregation of multiple cells. Alternatively, the NR may support a different air interface than the OFDM based interface. The NR network may comprise entities such as central units or distributed units.

As mentioned above, fig. 4 is provided as an example. Other examples may differ from what is described with respect to fig. 4.

Fig. 5 is a diagram 500 illustrating an example of a DL-centric time slot or wireless communication structure. The DL-centric time slot may include a control portion 502. The control portion 502 may exist in an initial or beginning portion of a DL-centric time slot. The control portion 502 may include various scheduling information and/or control information corresponding to various portions of the DL-centric time slot. In some configurations, the control portion 502 may be a Physical DL Control Channel (PDCCH), as shown in fig. 5. In some aspects, the control portion 502 may include legacy (legacy) PDCCH information, shortened PDCCH (spdcch) information, Control Format Indicator (CFI) values (e.g., carried on a Physical Control Format Indicator Channel (PCFICH)), one or more grants (e.g., downlink grants, uplink grants, etc.), and/or the like.

The DL centric time slot may also include a DL data portion 504. The DL data portion 504 may sometimes be referred to as the payload of a DL-centric slot. The DL data portion 504 may include communication resources for communicating DL data from a scheduling entity (e.g., a UE or BS) to a subordinate entity (e.g., a UE). In some configurations, the DL data portion 504 may be a Physical DL Shared Channel (PDSCH).

The DL-centric time slot may also include an UL short burst portion 506. UL short burst portion 506 may sometimes be referred to as a UL burst, a UL burst portion, a common UL burst, a short burst, a UL short burst, a common UL short burst portion, and/or various other suitable terms. In some aspects, the UL short burst portion 506 may include one or more reference signals. Additionally or alternatively, the UL short burst portion 506 may include feedback information corresponding to various other portions of the DL-centric time slot. For example, the UL short burst section 506 may include feedback information corresponding to the control section 502 and/or the data section 504. Non-limiting examples of information that may be included in UL short burst portion 506 include ACK signals (e.g., PUCCH ACK, PUSCH ACK, immediate ACK), NACK signals (e.g., PUCCH NACK, PUSCH NACK, immediate NACK), Scheduling Requests (SR), Buffer Status Reports (BSR), HARQ indicators, Channel State Indications (CSI), Channel Quality Indicators (CQI), Sounding Reference Signals (SRs), demodulation reference signals (DMRS), PUSCH data, and/or various other suitable types of information. The UL short burst portion 506 may include additional or alternative information, such as information related to Random Access Channel (RACH) procedures, scheduling requests, and various other suitable types of information.

As shown in fig. 5, the end of the DL data portion 504 may be separated in time from the beginning of the UL short burst portion 506. Such time separation may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. This separation provides time for a handover from DL communication (e.g., a receive operation by a subordinate entity (e.g., a UE)) to UL communication (e.g., a transmission by a subordinate entity (e.g., a UE)). The foregoing is merely one example of a DL-centric wireless communication structure, and alternative structures having similar features may exist without necessarily departing from the aspects described herein.

As noted above, fig. 5 is provided as an example only. Other examples may differ from what is described with respect to fig. 5.

Fig. 6 is a diagram 600 illustrating an example of a UL-centric time slot or wireless communication structure. The UL centric time slot may include a control portion 602. The control portion 602 may exist in an initial or beginning portion of a UL-centric time slot. The control portion 602 in fig. 6 may be similar to the control portion 502 described above with reference to fig. 5. The UL centric time slot may also include a UL long burst portion 604. The UL long burst portion 604 may sometimes be referred to as the payload of a UL-centric slot. The UL portion may refer to a communication resource for communicating UL data from a subordinate entity (e.g., a UE) to a scheduling entity (e.g., a UE or a BS). In some configurations, the control portion 602 may be a Physical DL Control Channel (PDCCH).

As shown in fig. 6, the end of the control portion 602 may be separated in time from the beginning of the UL long burst portion 604. Such time separation may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. This separation provides time for a handover from DL communication (e.g., a receive operation by the scheduling entity) to UL communication (e.g., a transmission by the scheduling entity).

The UL centric time slot may also include an UL short burst portion 606. The UL short burst portion 606 in fig. 6 may be similar to the UL short burst portion 506 described above with reference to fig. 5, and may include any of the information described above in connection with fig. 5. The foregoing is merely one example of a UL-centric wireless communication structure, and alternative structures having similar features may exist without necessarily departing from the aspects described herein.

In some cases, two or more subordinate entities (e.g., UEs) may communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relays, vehicle-to-vehicle (V2V) communications, internet of everything (IoE) communications, IoT communications, mission critical meshes, and/or various other suitable applications. In general, sidelink signals may refer to signals communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and/or control purposes. In some aspects, sidelink signals may be communicated using licensed spectrum (unlike wireless local area networks, which typically use unlicensed spectrum).

In one example, a wireless communication structure (such as a frame) may include both UL-centric time slots and DL-centric time slots. In this example, a ratio of UL-centric time slots to DL-centric time slots in a frame may be dynamically adjusted based at least in part on the amount of UL data and the amount of DL data transmitted. For example, if there is more UL data, the ratio of UL-centric time slots to DL-centric time slots may be increased. Conversely, if there is more DL data, the ratio of UL-centric time slots to DL-centric time slots may be reduced.

As noted above, fig. 6 is provided as an example only. Other examples may differ from what is described with respect to fig. 6.

For wideband operation on the downlink, a single serving cell may operate within a carrier with a bandwidth greater than 20 MHz. Here, multiple bandwidth portions may be configured, a single bandwidth portion may be activated, and the base station may send downlink transmissions on one or more portions or the entirety of the single active bandwidth portion (where clear channel assessment is successful at the base station). For uplink transmissions in a serving cell with a carrier bandwidth greater than the LBT bandwidth (e.g., PUSCH communications), for the case where the UE performs clear channel assessment prior to the uplink transmission, the UE may send the uplink transmission only when: the clear channel assessment at the UE is successful in all LBT bandwidths of the scheduled uplink transmission. Alternatively, in some cases, the UE may send uplink transmissions in all or a subset of LBT bandwidths for scheduled uplink communications (clear channel assessment at the UE is successful). In some cases, when configuring a group common PDCCH (GC-PDCCH), explicit indication via the GC-PDCCH may be supported as a mechanism to inform the UE to: whether one or more carriers and/or LBT bandwidth are unavailable or available for downlink reception, at least for one or more time slots not at the beginning of a downlink transmission burst.

Broadband operation is beneficial to overall system performance when wireless communication is using unlicensed spectrum. For example, in the case of unlicensed spectrum NR (NR-U), operation using wideband channels (e.g., channels with bandwidths greater than 20MHz, such as 80MHz wideband channels, 40MHz wideband channels, etc.) is beneficial to the overall performance of the NR system. In this case, a wideband channel may include multiple channels (e.g., multiple 20MHz channels) (sometimes referred to as subbands or subchannels).

However, other nodes may be configured to use one or more channels included in a wideband channel of the unlicensed spectrum (e.g., Wireless Local Area Network (WLAN) nodes, such as WiFi nodes), and thus there is no guarantee that there are no other nodes configured to use one or more channels of the wideband channel. Thus, prior to using the wideband channel, the wireless communication device may need to perform a Listen Before Talk (LBT) procedure to determine the availability of resources in the wideband channel.

A wireless communication device may evaluate the availability of a wideband channel using a wideband LBT procedure (e.g., a single LBT procedure for the entire wideband channel). However, in such cases, the use of even a single channel by another node in the wideband channel would prevent the wireless communication device from transmitting on any of the wideband channels (even though some channels may be available). Thus, when a wideband LBT procedure is used to evaluate the availability of a wideband channel, the utilization of wireless resources may be reduced.

To address this issue, the granularity of the LBT procedure should be consistent with the granularity of other nodes that may operate in unlicensed spectrum. For example, a given WiFi node may be configured to communicate using a 20MHz channel of the unlicensed spectrum. Thus, the granularity of the LBT procedure performed by the wireless communication device should be 20MHz (e.g., such that the LBT procedure is performed for each 20MHz channel of the wideband channel of the unlicensed spectrum).

In general, the LBT procedure associated with a given channel depends on acknowledgement information (e.g., an Acknowledgement (ACK) of a transmission or a Negative Acknowledgement (NACK) of a transmission) for the given channel. In other words, the wireless communication device performs an LBT procedure for each channel, where the LBT procedure associated with a given channel depends on the acknowledgement information associated with the given channel. For example, acknowledgement information associated with a given channel is used to selectively adjust a contention window associated with an LBT procedure for the given channel.

However, in NR, when mapping the coded bits of a given Transport Block (TB) associated with transmitting a given transmission, frequency first mapping is used. In other words, the coded bits of a given TB are mapped across resources in the frequency domain before being mapped across resources in the time domain. As a result of this frequency first mapping, the acknowledgement information received by the wireless communication device will not be on a per-channel basis. Instead, the acknowledgement information will correspond to the entire wideband channel and therefore cannot be used to adjust the contention window for individual ones of the wideband channels.

Some implementations described herein provide techniques and apparatus for multi-channel LBT using wideband transmission in NR-U.

Fig. 7 is a diagram illustrating the following example 700, in accordance with various aspects of the present disclosure: the wireless communication device receives acknowledgement information on a per-channel basis such that a contention window associated with an LBT procedure for a plurality of channels of a wideband channel of an NR unlicensed spectrum may be selectively adjusted.

In fig. 7, a wireless communication device (e.g., a Base Station (BS), such as base station 110) is configured to communicate with another wireless communication device (e.g., a UE, such as UE 120) using wideband channel transmissions in an unlicensed spectrum (e.g., an NR unlicensed spectrum). Further, the base station will perform an LBT procedure associated with channel availability assessment for each of a plurality of channels (e.g., each 20MHz channel) in a wideband channel (e.g., an 80MHz channel), as described above.

As shown in fig. 7 and reference numeral 705, a base station may perform rate matching of coded bits of a set of Transport Blocks (TBs) on a per-channel basis among a plurality of channels in a wideband channel of an unlicensed spectrum. For example, the base station may perform rate matching of the coded bits of the set of TBs on a per-channel basis such that the coded bits of the set of TBs are mapped to symbols of a first channel, followed by symbols of a second channel, and so on. Note that the coded bits are mapped on a per-channel basis such that the coded bits are mapped to resources of each channel (e.g., within the channel in the frequency and time domains), rather than first being mapped across resources of the wideband channel in the frequency domain as is typically the case with frequency first mapping employed in NR.

In some aspects, as shown in fig. 7, rate matching may be performed on a per-channel basis in a first set of timeslots of a transmission opportunity (e.g., an initial timeslot of a transmission opportunity, the first two timeslots of a transmission opportunity, the first three timeslots of a transmission opportunity, etc.). In some aspects, the base station may receive per-channel acknowledgement information (e.g., along with Code Block Group (CBG) -based feedback, where each channel may be associated with a different CBG) as a result of per-channel rate matching in the first set of time slots, as described below.

In some aspects, rate matching is performed on a per-channel basis in the first set of timeslots because the base station may not have determined the results of the LBT process for each of the plurality of channels when the base station prepares the set of TBs. In other words, the base station may perform rate matching on a per-channel basis in the first set of time slots because the base station does not know whether a given channel of the plurality of channels in the wideband channel is idle for use by the base station in association with sending transmissions when the base station prepares the set of TBs.

As also shown in fig. 7 and reference numeral 710, the base station may transmit a set of TBs on multiple channels of the wideband channel after performing rate matching on a per-channel basis. For example, the base station may send a transmission (e.g., PDSCH transmission) to the UE that includes a signal representing the set of code bits for the TB.

In some aspects, a base station may provide an indication to a UE to perform rate matching on a per-channel basis. For example, the base station may provide an indication to perform rate matching on a per-channel basis in a grant (e.g., included in the PDCCH) provided to the UE associated with the transmission. In some aspects, the indication to perform rate matching on a per-channel basis may be implicitly signaled by the base station (e.g., such that the UE may infer per-channel rate matching based on a signal provided by the base station).

In some aspects, the set of TBs may comprise a single TB. Here, the base station performs rate matching such that coded bits of the TB are mapped onto a plurality of channels. Alternatively, in some aspects, the set of TBs may include a plurality of TBs. In this case, in some aspects, the base station may perform rate matching such that the coded bits of each of the plurality of TBs are mapped to a respective one of the plurality of channels. In other words, the coded bits of each TB may be mapped to a different one of a plurality of channels of the wideband channel. In some aspects, when the set of TBs includes a plurality of TBs, the base station may provide a plurality of grants to the UE, wherein each grant includes information associated with a respective one of the plurality of TBs. Alternatively, the base station may provide a single grant to the UE, wherein the single grant includes information associated with each of the plurality of TBs.

In some aspects, after performing rate matching on a per-channel basis in a first set of time slots, the base station may perform rate matching of coded bits of another transport block on a frequency first basis in a second set of time slots of a transmission opportunity. In other words, after performing rate matching on a per-channel basis in a first set of time slots of a transmission opportunity, the base station may recover the frequency first rate matching in a second set of time slots of the transmission opportunity. In some aspects, the base station may resume performing rate matching on a frequency first basis in the second set of time slots because the base station should know whether a given channel of the plurality of channels in the wideband channel is idle for use by the base station in association with sending transmissions when the base station prepares other TBs. In some aspects, the base station may recover frequency first rate matching in the second set of time slots to reduce the amount of time required for the UE to process the transmission and/or to enable a separate transmission opportunity structure to send acknowledgement information within the same transmission opportunity.

As also shown in fig. 7 and reference numeral 715, the base station may receive per-channel acknowledgement information associated with multiple channels as a result of performing rate matching on a per-channel basis. For example, since rate matching is performed on a per-channel basis (rather than frequency first), the acknowledgement information provided by the UE will be on a per-channel basis (e.g., the acknowledgement information will include ACK/NACK for each of the multiple channels).

Accordingly, as indicated by reference numeral 720, the base station may selectively adjust a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT procedure for a respective one of the plurality of channels. For example, the base station may increase or decrease, or leave unchanged, a contention window length of an LBT procedure associated with each of the plurality of channels based at least in part on the per-channel acknowledgement information. In this way, multi-channel LBT using wideband transmission in NR-U can be achieved.

In some aspects, one of the multiple channels associated with sending the transmission may be punctured (e.g., when the channel is used by another node or determined to be unavailable). In this case, the base station may selectively adjust a contention window associated with an LBT procedure for the channel based at least in part on acknowledgement information associated with subsequent transmissions.

Note that although the above examples are described in the context of downlink transmissions (e.g., PDSCH transmissions), in some aspects the techniques described above may be applied to uplink transmissions (e.g., autonomous uplink transmissions).

As described above, fig. 7 is provided as an example. Other examples may differ from what is described with respect to fig. 7.

Fig. 8 is a diagram illustrating an example process 800, e.g., performed by a wireless communication device, in accordance with various aspects of the disclosure. As described herein, the example process 800 is an example of a wireless communication device (e.g., base station 110, UE 120) performing operations associated with improved rate matching in association with multi-channel LBT using wideband transmission in NR-U.

As shown in fig. 8, in some aspects, process 800 may include: rate matching of the coded bits of each of the plurality of transport blocks is performed on a per-channel basis among a plurality of channels in a wideband channel of the unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of time slots of a transmission opportunity, and wherein the rate matching of the coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels (block 810). For example, the wireless communication device (e.g., using controller processor 240/280, transmit processor 220/264, etc.) may: rate matching of the coded bits of each of the plurality of transport blocks is performed on a per-channel basis among a plurality of channels in a wideband channel of the unlicensed spectrum, wherein the rate matching is performed on a per-channel basis in a first set of time slots of a transmission opportunity, and wherein the rate matching of the coded bits is performed such that the coded bits of each of the plurality of transport blocks are mapped to a respective one of the plurality of channels, as described above.

As shown in fig. 8, in some aspects, process 800 may include: based at least in part on performing rate matching on a per-channel basis and receiving per-channel acknowledgement information associated with a plurality of channels after transmission of a plurality of transport blocks over the plurality of channels (block 820). For example, the wireless communication device (e.g., using the antenna 234/252, the receive processor 238/258, the controller/processor 240/280, etc.) may: the per-channel acknowledgement information associated with the plurality of channels is received based at least in part on performing rate matching on a per-channel basis and after transmission of the plurality of transport blocks over the plurality of channels, as described above.

As shown in fig. 8, in some aspects, process 800 may include: a plurality of contention windows are selectively adjusted based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT process to be performed on a respective one of the plurality of channels (block 830). For example, the wireless communication device (e.g., using the controller/processor 240/280, transmit processor 220/264, etc.) may: selectively adjusting a plurality of contention windows based at least in part on the per-channel acknowledgement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels, as described above.

Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in conjunction with one or more other processes described elsewhere herein.

In a first aspect, the transmission is a Physical Downlink Shared Channel (PDSCH) transmission.

In a second aspect, separately or in combination with the first aspect, a plurality of grants are provided to the other wireless communication device, each grant being associated with a respective one of the plurality of transport blocks.

In a third aspect, alone or in combination with the first aspect, a single grant associated with each of a plurality of transport blocks is provided to another wireless communication device.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, when puncturing a channel of the plurality of channels associated with sending the transmission, a contention window of the plurality of contention windows associated with the channel is selectively adjusted based at least in part on acknowledgement information associated with a subsequent transmission.

Although fig. 8 shows example blocks of the process 800, in some aspects the process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in fig. 8. Additionally or alternatively, two or more blocks of process 800 may be performed in parallel.

Fig. 9 is a diagram illustrating the following example 900 in accordance with various aspects of the disclosure: measurement information associated with a plurality of channels of a wideband channel of an NR unlicensed spectrum is received and a contention window associated with an LBT procedure for the plurality of channels is selectively adjusted based at least in part on the measurement information.

In fig. 9, a wireless communication device (e.g., a base station, such as Base Station (BS)110) is configured to communicate with another wireless communication device (e.g., a UE, such as UE 120) using wideband channel transmissions in an unlicensed spectrum (e.g., an NR unlicensed spectrum). Further, the base station is to perform an LBT procedure associated with channel availability assessment for each of a plurality of channels (e.g., each 20MHz channel) in a wideband channel (e.g., an 80MHz channel), as described above.

As shown in fig. 9 and reference numeral 905, a base station may receive measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum. For example, the measurement information may include information associated with the following measurements: a respective signal-to-noise ratio (SNR) measurement for a given channel of the plurality of channels (e.g., an SNR measurement based at least in part on a measurement of a demodulation reference signal (DMRS)), an interference measurement for a given channel of the plurality of channels (e.g., an interference measurement based at least in part on a measurement of interference measurement channel state information reference information (IMR-CSI-RS)), and/or the like.

In some aspects, the base station may receive measurement information periodically (e.g., when the UE is configured to report measurements associated with each channel at particular time intervals). In some aspects, the base station may receive measurement information based at least in part on sending a request to the UE (i.e., the base station may request the UE to provide measurement information associated with each of the plurality of channels).

As also shown in fig. 9 and reference numeral 910, the base station may selectively adjust a plurality of contention windows based at least in part on the measurement information, each contention window being associated with an LBT procedure associated with a respective one of the plurality of channels. For example, the base station may increase or decrease, or leave unchanged, a contention window length of an LBT procedure associated with each of the plurality of channels based at least in part on the measurement information. In this way, multi-channel LBT using wideband transmission in NR-U can be achieved. Note that in example 900, the contention window is selectively adjusted based at least in part on measurement information (rather than acknowledgement information associated with each channel, as described above in connection with fig. 7 and 8).

As described above, fig. 9 is provided as an example. Other examples may differ from what is described with respect to fig. 9.

Fig. 10 is a diagram illustrating an example process 1000, e.g., performed by a wireless communication device, in accordance with various aspects of the disclosure. As described herein, the example process 1000 is an example of a wireless communication device (e.g., base station 110, UE 120) performing operations associated with SNR and/or interference level per channel reporting in association with multi-channel LBT using wideband transmission in NR-U.

As shown in fig. 10, in some aspects, process 1000 may include: measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum is received, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective SNR measurement or a respective interference measurement (block 1010). For example, the wireless communication device (e.g., using the antenna 234/252, the receive processor 238/258, the controller/processor 240/280, etc.) may: measurement information for each of a plurality of channels in a wideband channel of an unlicensed spectrum is received, wherein the measurement information includes, for each of the plurality of channels, information associated with a respective SNR measurement or a respective interference measurement, as described above.

As shown in fig. 10, in some aspects, process 1000 may include: a plurality of contention windows are selectively adjusted based at least in part on the measurement information, each contention window being associated with an LBT process to be performed on a respective one of the plurality of channels (block 1020). For example, the wireless communication device (e.g., using the antenna 232/252, the receive processor 238/258, the controller/processor 240/280, etc.) may: selectively adjusting a plurality of contention windows based at least in part on the measurement information, each contention window associated with an LBT procedure to be performed on a respective one of the plurality of channels, as described above.

Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in conjunction with one or more other processes described elsewhere herein.

In a first aspect, the SNR measurement is based at least in part on a measurement of a demodulation reference signal (DMRS).

In a second aspect, alone or in combination with the first aspect, the interference measurement is based at least in part on a measurement of an interference measurement resource channel state information reference signal (IMR-CSI-RS).

Although fig. 10 shows example blocks of the process 1000, in some aspects the process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in fig. 10. Additionally or alternatively, two or more blocks of process 1000 may be performed in parallel.

Fig. 11 is a diagram illustrating the following example 1100, in accordance with various aspects of the present disclosure: wireless local area network preamble detection is performed on a plurality of channels of a wideband channel of the NR unlicensed spectrum, and a bandwidth of an LBT procedure associated with the wideband channel is selectively adjusted based at least in part on a result of the WLAN preamble detection.

In fig. 11, a wireless communication device (e.g., a Base Station (BS), such as base station 110) is configured to communicate with another wireless communication device (e.g., a UE, such as UE 120) using wideband channel transmissions in an unlicensed spectrum (e.g., an NR unlicensed spectrum). Further, the base station will perform LBT procedures associated with channel availability assessment for the wideband channel. In some aspects, the base station may adapt the bandwidth of the wideband LBT procedure based at least in part on WLAN preamble detection, as described below.

As shown in fig. 11 and reference numeral 1105, a base station may perform Wireless Local Area Network (WLAN) preamble detection (e.g., WiFi preamble detection) for each of a plurality of channels in a wideband channel of an unlicensed spectrum. For example, the base station may attempt to detect a WiFi preamble on each of a plurality of channels.

As indicated by reference numeral 1110, the base station can selectively adjust a bandwidth associated with the LBT procedure based at least in part on results of performing WLAN preamble detection for each of the plurality of channels. For example, the base station may adapt a bandwidth of an LBT procedure associated with the wideband channel based at least in part on a result of the WLAN preamble detection. As a particular example, if the result of WiFi preamble detection is that a WiFi preamble is detected on one of four 20MHz channels of the wideband channel, the base station may adjust the bandwidth of the wideband LBT process such that the wideband LBT process is performed for the three available 20MHz channels. In this case, the base station may perform a wideband LBT procedure associated with the channel availability assessment. In some aspects, the base station may provide information signaled to the UE identifying a bandwidth associated with the LBT procedure.

As described above, fig. 11 is provided as an example. Other examples may differ from what is described with respect to fig. 11.

Fig. 12 is a diagram illustrating an example process 1200 performed, for example, by a wireless communication device, in accordance with various aspects of the disclosure. As described herein, the example process 1200 is an example of a wireless communication device (e.g., base station 110, UE 120) performing LBT bandwidth adaptation based on WLAN preamble detection.

As shown in fig. 12, in some aspects, process 1200 may include: WLAN preamble detection is performed for each of a plurality of channels in a wideband channel of an unlicensed spectrum (block 1210). For example, the wireless communication device (e.g., using the antenna 232/252, the receive processor 238/258, the controller/processor 240/280, etc.) may: WLAN preamble detection is performed for each of a plurality of channels in a wideband channel of the unlicensed spectrum, as described above.

As shown in fig. 12, in some aspects, process 1200 may include: a bandwidth associated with the LBT procedure is selectively adjusted based at least in part on a result of performing WLAN preamble detection for each of the plurality of channels (block 1220). For example, the wireless communication device (e.g., using the receive processor 238/258, the controller/processor 240/280, etc.) may: the bandwidth associated with the LBT procedure is selectively adjusted based at least in part on a result of performing WLAN preamble detection for each of the plurality of channels, as described above.

Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in conjunction with one or more other processes described elsewhere herein.

In some aspects, information identifying a bandwidth associated with an LBT procedure is signaled to another wireless communication device.

Although fig. 12 shows example blocks of the process 1200, in some aspects the process 1200 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in fig. 12. Additionally or alternatively, two or more blocks of process 1200 may be performed in parallel.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of various aspects.

As used herein, the term component is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software.

As used herein, meeting a threshold may refer to a value greater than the threshold, greater than or equal to the threshold, less than or equal to the threshold, not equal to the threshold, etc., depending on the context.

It is apparent that the systems and/or methods described herein may be implemented in various forms of hardware, firmware, or a combination of hardware and software. The actual specialized control hardware or software code used to implement the systems and/or methods is not limiting in every respect. Thus, the operation and behavior of the systems and/or methods were described herein without reference to the specific software code-it being understood that software and hardware may be designed to implement the systems and/or methods based, at least in part, on the description herein.

Although particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may be directly dependent on only one claim, the disclosure of the various aspects includes each dependent claim in combination with every other claim in the set of claims. A phrase referring to at least one of a list of items refers to any combination of these items, including a single member. By way of example, "at least one of a, b, or c" is intended to encompass: a. b, c, a-b, a-c, b-c, and a-b-c, and any combination of multiple identical elements (e.g., a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c).

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more. Further, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more. Where only one item is intended, the term "only one" or similar language is used. Also, as used herein, the term "having" and the like are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise.