Beam selection for communication in multiple transmission and reception point deployments

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may determine a beam set for communicating with a set of transmit reception points (TRPs) scheduled using a single downlink control message based at least in part on determining that a scheduling offset is less than a beam switching latency threshold and at least in part on at least one of a transmission configuration indicator codepoint mapping or a control resource set configuration. The UE may communicate with the set of TRPs using the beam set based at least in part on determining the beam set. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 928,857, filed on October 31, 2019, entitled “BEAM SELECTION FOR COMMUNICATION IN A MULTI-TRANSMIT-RECEIVE POINT DEPLOYMENT,” and U.S. Non-Provisional Patent Application No. 16 / 949,233, filed on October 21, 2020, entitled “BEAM SELECTION FOR COMMUNICATION IN A MULTI-TRANSMIT-RECEIVE POINT DEPLOYMENT,” which are hereby expressly incorporated herein by reference.

[0003] public domain

[0004] Aspects of the present disclosure relate generally to wireless communications, and more particularly to techniques and apparatus for beam selection for communications in multiple transmission reception point deployments.

[0005] background

[0006] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies 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 (3GPP).

[0007] A wireless communication network may include several base stations (BSs) capable of supporting communications for several user equipment (UEs). User equipment (UEs) may communicate with the base stations (BSs) via downlinks and uplinks. The downlink (or forward link) refers to the communication link from the BS to the UE, while the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit / receive point (TRP), new radio (NR) BS, 5G Node B, and so on.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global levels. 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 (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation for better integration with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a user equipment (UE) may include: determining a beam set for communicating with a set of transmit receive points (TRPs) scheduled using a single downlink control information based at least in part on determining that a scheduling offset is less than a beam switching wait time threshold, based at least in part on at least one of a transmission configuration indicator (TCI) code point mapping or a control resource set (CORESET) configuration, wherein the beam set includes one or more physical downlink shared channel (PDSCH) beams; and using the beam set to communicate with the TRP set based at least in part on the determined beam set.

[0011] In some aspects, a wireless communication method performed by a UE may include: determining a beam set with an unconfigured spatial relationship for communicating with a TRP set based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, wherein the beam set includes one or more physical uplink control channel (PUCCH) beams or one or more sounding reference signal (SRS) beams; and using the beam set to communicate with the TRP set based at least in part on the determined beam set.

[0012] In some aspects, a UE 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 determine, based at least in part on determining that a scheduling offset is less than a beam switching latency threshold, a beam set for communicating with a TRP set scheduled using single downlink control information based at least in part on at least one of a TCI code point mapping or a CORESET configuration, wherein the beam set includes one or more PDSCH beams; and communicate with the TRP set using the beam set based at least in part on determining the beam set.

[0013] In some aspects, a UE 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 determine a beam set with an unconfigured spatial relationship for communicating with a TRP set based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, wherein the beam set includes one or more PUCCH beams or one or more SRS beams; and communicate with the TRP set using the beam set based at least in part on determining the beam set.

[0014] 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 one or more processors of a UE, may cause the one or more processors to: determine, based at least in part on determining that a scheduling offset is less than a beam switching latency threshold, a beam set for communicating with a TRP set scheduled using single downlink control information based at least in part on at least one of a TCI code point mapping or a CORESET configuration, wherein the beam set includes one or more PDSCH beams; and communicate with the TRP set using the beam set based at least in part on determining the beam set.

[0015] 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 one or more processors of a UE, may cause the one or more processors to: determine a beam set with an unconfigured spatial relationship for communicating with a TRP set based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, wherein the beam set includes one or more PUCCH beams or one or more SRS beams; and communicate with the TRP set using the beam set based at least in part on the determined beam set.

[0016] In some aspects, an apparatus for wireless communication may include: means for determining a beam set for communicating with a TRP set scheduled using a single downlink control information based at least in part on determining that a scheduling offset is less than a beam switching wait time threshold, based at least in part on at least one of a TCI code point mapping or a CORESET configuration, wherein the beam set includes one or more PDSCH beams; and means for communicating with the TRP set using the beam set based at least in part on determining the beam set.

[0017] In some aspects, an apparatus for wireless communication may include: a device for determining a beam set with an unconfigured spatial relationship for communicating with a TRP set based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, wherein the beam set includes one or more PUCCH beams or one or more SRS beams; and a device for communicating with the TRP set using the beam set based at least in part on the determined beam set.

[0018] Aspects generally include methods, apparatus, 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 in the accompanying figures and description.

[0019] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The concepts and specific examples disclosed can be readily used as a basis for modifying or designing other structures for implementing the same purposes as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, as well as the associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures is provided for illustration and description purposes and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to understand in detail the features of the present disclosure set forth above, a more particular description of the content briefly summarized above may be obtained with reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are not to be considered limiting of its scope, as the description may admit to other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0021] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0022] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0023] Figure 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.

[0024] Figure 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.

[0025] Figure 4 is a block diagram conceptually illustrating an example slot format with a normal cyclic prefix in accordance with various aspects of the present disclosure.

[0026] Figure 5 An example logical architecture of a distributed radio access network (RAN) in accordance with various aspects of the present disclosure is illustrated.

[0027] Figure 6 An example physical architecture of a distributed RAN according to various aspects of the present disclosure is illustrated.

[0028] Figure 7 is a diagram illustrating an example of beam selection for communication in a multiple transmission reception point deployment according to various aspects of the present disclosure.

[0029] Figure 8 and 9 is a diagram illustrating example processes performed, for example, by a UE, according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0030] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and they will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods that are practiced using a supplement to the various aspects of the present disclosure set forth herein or other other structures, functionality, or structure and functionality. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0031] Several aspects of telecommunications systems will now be presented with reference to various devices and techniques. These devices and techniques are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0032] It should be noted that while various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applicable in communication systems based on other generations, such as 5G and later generations, including NR technology.

[0033] Figure 1 1 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several 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, transmit reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0034] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. 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 residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown in FIG, 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 102c. 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.

[0035] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or the like using any suitable transport network.

[0036] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , relay base station 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay base station may also be referred to as a relay BS, relay station, relay, or the like.

[0037] 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 impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0038] The network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. These BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0039] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, 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 computer, 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 (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0040] Some UEs may be considered machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to 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 inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0041] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. A frequency may also be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0042] 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) using one or more sidelink channels. For example, the UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this scenario, the UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0043] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0044] Figure 2 A block diagram shows a design 200 of a base station 110 and a UE 120, which may be Figure 1 One for each base station and one for each UE in . Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0045] At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) 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)) 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., a cell-specific reference signal (CRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)). A transmit (TX) multiple-input, multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, as 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 frequency upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively. According to various aspects described in greater detail below, position coding may be utilized to generate synchronization signals to convey additional information.

[0046] 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) the 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 where 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), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0047] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.) from the controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the 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 the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. Receive processor 238 may provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Network controller 130 may include communication unit 294, controller / processor 290, and memory 292.

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or the like may perform one or more techniques associated with beam selection for communication in a multiple transmission reception point deployment, as described in more detail elsewhere herein. Figure 2 Any other component of the may perform or direct e.g. Figure 8 The process of 800 Figure 9 900, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Figure 8 The process of 800 Figure 9 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0049] In some aspects, the UE 120 may include: means for determining, based at least in part on determining that the scheduling offset is less than a beam switching wait time threshold, at least in part on at least one of a TCI code point mapping or a CORESET configuration, a beam set for communicating with a TRP set scheduled using a single downlink control information, wherein the beam set includes one or more PDSCH beams; means for determining, based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, a beam set with an unconfigured spatial relationship for communicating with the TRP set, wherein the beam set includes one or more PUCCH beams or one or more SRS beams; means for communicating with the TRP set using the beam set based at least in part on determining the beam set, and the like. In some aspects, such means may include combining Figure 2 One or more components of the UE 120 are depicted, such as the controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and so forth.

[0050] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0051] Figure 3AAn example frame structure 300 for frequency division duplex (FDD) in a telecommunications system (e.g., NR) is shown. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames (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., with indices 0 to Z-1). Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of time slots (e.g., in Figure 3A Each subframe 2 is shown in m time slots, where m is a parameter design for transmission, such as 0, 1, 2, 3, 4, etc.). Each time slot may include a set of L symbol periods. For example, each time slot may include fourteen symbol periods (e.g., Figure 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 assigned indices 0 to 2L–1. In some aspects, the scheduling unit for FDD may be frame-based, subframe-based, slot-based, symbol-based, etc.

[0052] Although some techniques are described herein with reference to frames, subframes, time slots, etc., these techniques are equally applicable to other types of wireless communication structures that may be referred to using terms other than "frames," "subframes," "time slots," etc. in 5G NR. In some aspects, a "wireless communication structure" may refer to a periodic, time-bounded communication unit defined by a wireless communication standard and / or protocol. Additionally or alternatively, a wireless communication structure may be used in conjunction with a wireless communication standard and / or protocol. Figure 3A The wireless communication structure configurations are different from those shown in FIG.

[0053] In certain telecommunications (e.g., NR), a base station may transmit synchronization (SYNC) signals. For example, a base station may transmit a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and the like 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, the PSS may be used by the UE to determine symbol timing, while the SSS may be used by the UE to determine the physical cell identifier associated with the 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 that supports initial access by the UE.

[0054] In some aspects, a base station may transmit the PSS, SSS, and / or PBCH according to a synchronization communication level (e.g., a synchronization signal (SS) level) including multiple synchronization communications (e.g., SS blocks), as described below in conjunction with Figure 3B described.

[0055] Figure 3B FIG. 1 is a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronous communication hierarchy. Figure 3B As shown in FIG, the SS hierarchy may include an SS burst set, which may include a plurality of SS bursts (identified as SS burst 0 to SS burst B-1, where B is the maximum number of repetitions of the SS burst that may be transmitted by the base station). As further shown, each SS burst may include one or more SS blocks (identified as SS block 0 to SS block (b max_SS -1), where 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 differently. SS burst sets may be transmitted by a wireless node periodically, such as every X milliseconds, e.g. Figure 3B In some aspects, the SS burst set may have a fixed or dynamic length, as shown in Figure 3B is shown as Y milliseconds.

[0056] Figure 3B The SS burst set shown in is an example of a synchronous communication set, and other synchronous communication sets can be used in conjunction with the techniques described herein. Figure 3B The SS blocks shown in FIG. 5 are examples of synchronous communications, and other synchronous communications may be used in conjunction with the techniques described herein.

[0057] In some aspects, an SS block includes resources that carry PSS, SSS, PBCH, and / or other synchronization signals (e.g., a tertiary 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 can be the same across each SS block of an SS burst. In some aspects, a single SS block can be included in an SS burst. In some aspects, an SS block can 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).

[0058] In some aspects, the symbols of the SS block are consecutive, such as Figure 3B In some aspects, the symbols of an SS block are non-consecutive. Similarly, in some aspects, one or more SS blocks of an SS burst may be transmitted in contiguous radio resources (e.g., contiguous 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-consecutive radio resources.

[0059] In some aspects, an SS burst may have a burst periodicity, whereby each SS block of the SS burst is transmitted by the base station according to the burst period. In other words, the SS blocks may be repeated during each SS burst. In some aspects, an SS burst set may have a burst set periodicity, whereby each SS burst of the SS burst set is transmitted by the base station according to a fixed burst set periodicity. In other words, the SS burst may be repeated during each SS burst set.

[0060] The base station may transmit system information, such as system information blocks (SIBs), on the physical downlink shared channel (PDSCH) in certain time slots. The base station may transmit control information / data on the physical downlink control channel (PDCCH) in C symbol periods of a time slot, where B may be configurable for each time slot. The base station may transmit traffic data and / or other data on the PDSCH in the remaining symbol periods of each time slot.

[0061] As indicated above, Figure 3A and 3B are provided as examples. Other examples may differ from those described in Figure 3A and 3B Examples described.

[0062] Figure 4 An example slot format 410 with a normal cyclic prefix is ​​shown. 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 several 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 real or complex valued.

[0063] For FDD in certain telecommunication systems (e.g., NR), an interlace structure may be used for each of the downlink and uplink. For example, Q interlaces with indices 0 to Q–1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include time slots spaced apart by Q frames. Specifically, interlace q may include time slots q, q+Q, q+2Q, and so on, where q∈{0,…,Q–1}.

[0064] A UE may be located within the coverage of multiple BSs. One of these 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, etc. Received signal quality may be quantified by signal-to-noise-and-interference ratio (SNIR), received reference signal quality (RSRQ), or some other metric. The UE may operate in a dominant interference scenario, where the UE may observe high interference from one or more interfering BSs.

[0065] While aspects of the examples described herein may be associated with NR or 5G technology, aspects of the present disclosure may be applicable to other wireless communication systems. New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., other than an air interface based on Orthogonal Frequency Division Multiple Access (OFDMA)) or a fixed transport layer (e.g., other than Internet Protocol (IP)). In various 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 may utilize CP-OFDM on the downlink and include support for half-duplex operation using time division duplex (TDD). In various aspects, NR may utilize OFDM with CP (referred to herein as CP-OFDM) and / or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) on the uplink, and may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD, for example. NR may include enhanced mobile broadband (eMBB) services targeting wide bandwidth (e.g., 80 megahertz (MHz) and above), millimeter wave (mmW) targeting high carrier frequencies (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatible MTC technologies, and / or mission critical services targeting ultra-reliable low latency communication (URLLC) services.

[0066] In some aspects, a single component carrier bandwidth of 100 MHz may be supported. NR resource blocks may span 12 subcarriers with a subcarrier bandwidth of 60 or 120 kilohertz (kHz) over a duration of 0.1 milliseconds (ms). 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 slot may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each slot may be dynamically switched. Each slot may include DL / UL data and DL / UL control data.

[0067] Beamforming can be supported and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. MIMO configuration in DL can support up to 8 transmit antennas (with multi-layer DL transmission of up to 8 streams) and up to 2 streams per UE. Multi-layer transmission of up to 2 streams per UE can be supported. Aggregation of multiple cells can be supported using up to 8 serving cells. Alternatively, NR can support different air interfaces other than OFDM-based interfaces. NR networks can include entities such as central units or distributed units.

[0068] As indicated above, Figure 4 are provided as examples. Other examples may differ from those described in Figure 4 Examples described.

[0069] Figure 5 Illustrated is an example logical architecture of a distributed RAN 500 in accordance with various aspects of the present disclosure. A 5G access node 506 may include an access node controller (ANC) 502. The ANC may be a central unit (CU) of the distributed RAN 500. The backhaul interface to the next generation core network (NG-CN) 504 may terminate at the ANC. The backhaul interface to the adjacent next generation access node (NG-AN) may terminate at the ANC. The ANC may include one or more TRPs 508 (which may also be referred to as a BS, NR BS, Node B, 5G NB, AP, gNB, or some other terminology). As described above, "TRP" may be used interchangeably with "cell."

[0070] The TRP 508 may be a distributed unit (DU). The TRP may be connected to one ANC (ANC 502) or more than one ANC (not illustrated). For example, for RAN sharing, Radio as a Service (RaaS), and service-specific ANC deployments, the TRP may be connected to more than one ANC. The TRP may include one or more antenna ports. The TRP may be configured to serve traffic to the UE individually (e.g., dynamically selected) or jointly (e.g., jointly transmitted).

[0071] The local architecture of the RAN 500 can be used to illustrate fronthaul communications. The architecture can be defined to support fronthaul solutions across different deployment types. For example, the architecture can be based at least in part on transport network capabilities (e.g., bandwidth, latency, and / or jitter).

[0072] The architecture may share features and / or components with LTE. According to various aspects, the Next Generation AN (NG-AN) 510 may support dual connectivity with NR. The NG-AN may share a common fronthaul for LTE and NR.

[0073] This architecture enables collaboration between and among TRPs 508. For example, collaboration can be provisioned within a TRP and / or across TRPs via ANC 502. According to various aspects, an inter-TRP interface may not be required / present.

[0074] According to various aspects, there may be dynamic configuration of split logical functions within the architecture of the RAN 500. Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), or Medium Access Control (MAC) protocols may be adaptively placed at the ANC or TRP.

[0075] According to various aspects, a BS may include a central unit (CU) (eg, ANC 502) and / or one or more distributed units (eg, one or more TRPs 508).

[0076] As indicated above, Figure 5 are provided as examples. Other examples may differ from those described in Figure 5 Examples described.

[0077] Figure 6 An example physical architecture of a distributed RAN 600 according to aspects of the present disclosure is illustrated. A centralized core network unit (C-CU) 602 can host core network functions. The C-CU can be centrally deployed. C-CU functionality can be offloaded (e.g., to Advanced Wireless Services (AWS)) to handle peak capacity.

[0078] The centralized RAN unit (C-RU) 604 can host one or more ANC functions. Optionally, the C-RU can host core network functions locally. The C-RU can have a distributed deployment. The C-RU can be closer to the network edge.

[0079] A distributed unit (DU) 606 may host one or more TRPs. The DU may be located at the edge of the network with radio frequency (RF) functionality.

[0080] As indicated above, Figure 6 are provided as examples. Other examples may differ from those described in Figure 6 Examples described.

[0081] In some communication systems, a UE may communicate with multiple TRPs (e.g., multiple BSs 110). For example, the UE may be deployed in a multi-TRP (mTRP) deployment that enables the UE to communicate with multiple TRPs on multiple links. In some cases, at least one of these TRPs may provide configuration information to identify the spatial relationship of beams used by the UE (e.g., spatial relationship information). In such cases, the UE may use the spatial relationship to determine the beam (e.g., a default beam) used to transmit SRS or PUCCH on SRS resources or PUCCH resources, respectively. However, in some cases, the UE may not receive the configuration information identifying the spatial relationship. In addition, in some cases, the UE may receive downlink control information (DCI) that schedules PDSCH with a scheduling offset (e.g., a delay between DCI and PDSCH) that is less than a beam switching wait time threshold. In such cases, the UE may not have time to switch to the beam indicated by the DCI to receive the PDSCH.

[0082] Some aspects described herein implement beam selection for communication in an mTRP deployment. For example, a UE may determine a beam set (e.g., a default beam set) for communicating with a TRP set based at least in part on TCI code point mapping, CORESET configuration, path loss reference signal (PL RS) configuration, etc. In this case, the UE may use the determined beam set to transmit SRS and / or PUCCH, and / or receive PDSCH. In this way, the UE may communicate with one or more TRPs in a plurality of TRPs when there is no spatial relationship configured for the beam used by the UE and / or when the scheduling offset is less than a beam switching wait time threshold.

[0083] Figure 7 is a diagram illustrating an example 700 of beam selection for communication in an mTRP deployment according to various aspects of the present disclosure. Figure 7 As shown, example 700 includes a UE 120 in communication with a first BS 110 (eg, a first TRP, TRP-1) and a second BS 110 (eg, a second TRP, TRP-2).

[0084] like Figure 7 , and shown by reference numeral 710, UE 120 may determine an mTRP transmission scenario. For example, UE 120 may determine whether UE 120 is operating in a single DCI scenario with multiple TRPs (e.g., where communications between UE 120 and the multiple TRPs are scheduled using a single DCI). In this case, UE 120 may determine that UE 120 is operating in a single DCI scenario based at least in part on whether a TCI code point maps to multiple TCI states. In some aspects, UE 120 may determine whether UE 120 is operating in a multi-DCI scenario with multiple TRPs (e.g., where communications between UE 120 and the multiple TRPs are scheduled using multiple (e.g., corresponding) DCIs). For example, UE 120 may determine that a first higher layer TRP index is configured for a first CORESET and is different from a second higher layer TRP index configured for a second CORESET in the PDCCH configuration message.

[0085] In some aspects, UE 120 may determine an association of resources (e.g., SRS resources or PUCCH resources to be used for transmission of SRS or PUCCH, respectively) with one or more TRPs in a TRP set (e.g., TRP-1 and TRP-2). For example, UE 120 may determine an association of resources with one or more TRP indices respectively associated with the TRP set. In some aspects, UE 120 may determine an association of resources with one or more TRPs in a single DCI scenario or a multiple DCI scenario.

[0086] In some aspects, UE 120 may determine the association of a resource with a single TRP (e.g., a single TRP index) from a set of TRPs. In some aspects, UE 120 may determine the association of a resource with a single TRP (e.g., TRP-1 or TRP-2) based at least in part on an identifier of the resource. For example, a first set of resource identifiers may be associated with a first TRP (TRP-1) and a second set of resource identifiers may be associated with a second TRP (TRP-2). In some aspects, the first set of resource identifiers may include a first half of the entire set of resource identifiers and the second set of resource identifiers may include a second half of the entire set of resource identifiers.

[0087] In some aspects, UE 120 may determine association of a resource with a single TRP (e.g., TRP-1 or TRP-2) based at least in part on a closed-loop power control index associated with the resource. For example, a first closed-loop power control index may be associated with a first TRP (TRP-1), while a second closed-loop power control index may be associated with a second TRP (TRP-2).

[0088] In some aspects, UE 120 may determine association of resources with a single TRP (e.g., TRP-1 or TRP-2) based at least in part on a PUCCH group identifier associated with the resources. For example, a first set of resources may be associated with a first PUCCH group (e.g., a first PUCCH group identifier) ​​and a second set of resources may be associated with a second PUCCH group (e.g., a second PUCCH group identifier). Continuing with the previous example, the first PUCCH group may be associated with a first TRP (TRP-1) and the second PUCCH group may be associated with a second TRP (TRP-2). In some aspects, UE 120 may receive the PUCCH group identifier in a spatial relation update for the PUCCH group (e.g., included in a media access control-control element (MAC-CE)).

[0089] In some aspects, the UE 120 may determine an association of a resource with multiple TRPs (e.g., multiple TRP indices) in a TRP set (e.g., TRP-1 and TRP-2). In such a scenario, the UE 120 may receive a configuration (e.g., via radio resource control (RRC) signaling, MAC-CE, DCI, etc.) that identifies an mTRP mode for the resource and a beam switching mode to be used with the mTRP mode. The mTRP mode may be a multiplexing mode such as space division multiplexing, time division multiplexing, frequency division multiplexing, etc.

[0090] like Figure 7, and further shown by reference numeral 720, UE 120 may determine a beam for receiving PDSCH, transmitting SRS, and / or transmitting PUCCH. For example, UE 120 may determine a beam for transmitting to a first TRP (TRP-1), a beam for transmitting to a second TRP (TRP-2), and the like. As another example, UE 120 may determine a beam for receiving from a first TRP (TRP-1), a beam for receiving from a second TRP (TRP-2), and the like. In some aspects, UE 120 may determine a beam based at least in part on an mTRP transmission scenario and / or an association of resources with a TRP index. In some aspects, the beam determined by UE 120 may be used in a single DCI scenario. However, in aspects herein, the beam determined by UE 120 may be used in a multiple DCI scenario.

[0091] In some aspects, UE 120 may determine one or more PDSCH beams to use for receiving a PDSCH from a first TRP (TRP-1) and / or a second TRP (TRP-2). The one or more PDSCH beams may be default beams to be used by UE 120 when the indicated beams cannot be used by UE 120. For example, UE 120 may determine the one or more PDSCH beams based at least in part on determining that a scheduling offset between a DCI scheduling a PDSCH and the PDSCH satisfies (e.g., is less than) a beam switching latency threshold.

[0092] In some aspects, UE 120 may determine a PDSCH beam for receiving PDSCH from a single TRP (e.g., TRP-1 or TRP-2) in a TRP set. For example, UE 120 may determine a PDSCH beam corresponding to a beam used by UE 120 to monitor a CORESET associated with a lowest CORESET identifier in a latest time slot in which one or more CORESETs are configured for UE 120.

[0093] In some aspects, the UE 120 may determine a first PDSCH beam and a second PDSCH beam for receiving (e.g., concurrently) PDSCH from a first TRP (TRP-1) and a second TRP (TRP-2), respectively. In some aspects, the UE 120 may receive a TCI code point mapping in the DCI, and the TCI code points of the TCI code point mapping may be mapped to a TCI state pair (or a single TCI state). In such a case, the UE 120 may select a TCI state pair from one or more TCI state pairs identified by the TCI code point mapping, and the first and second PDSCH beams may be associated with the TCI state pair, respectively. For example, the UE 120 may select a TCI state pair having a lowest or highest sum of TCI state identifiers among the TCI state pairs of the TCI code point mapping.

[0094] In some aspects, as described above, the UE 120 may determine a first PDSCH beam based at least in part on a beam used by the UE 120 to monitor a CORESET (or based at least in part on another beam, such as a first beam indicated by a TCI state pair), and may determine a second PDSCH beam based at least in part on a TCI code point mapping. For example, if the determined first PDSCH beam is associated with a TCI state that matches a first TCI state in the TCI state pair, the UE 120 may determine the second PDSCH beam based at least in part on a second TCI state in the TCI state pair. As another example, if the TCI state associated with the determined first PDSCH beam does not match a TCI state in the TCI state pair, the UE 120 may determine the second PDSCH beam based at least in part on a quasi-co-located (QCL) source associated with the first PDSCH beam, such as a QCL type D source (e.g., spatial reception parameters). For example, UE 120 may identify a TCI state pair of TCI codepoint mappings having a first TCI state associated with the same QCL source as the first PDSCH beam. In this case, UE 120 may determine the second PDSCH beam based at least in part on the second TCI state in the identified TCI state pair.

[0095] In some aspects, UE 120 may determine one or more PUCCH beams or SRS beams to be used to transmit PUCCH or SRS to a first TRP (TRP-1) and / or a second TRP (TRP-2), respectively. The PUCCH beams or SRS beams may be referred to herein as uplink beams. When UE 120 is not configured with spatial relationships (e.g., spatial relationship information) for determining uplink beams, the one or more PUCCH beams or SRS beams may be default beams to be used by UE 120.

[0096] In some aspects, UE 120 may determine an uplink beam for transmitting PUCCH or SRS to a single TRP (e.g., TRP-1 or TRP-2) in a TRP set. In some aspects, as described above, UE 120 may transmit PUCCH or SRS in PUCCH resources or SRS resources associated with the TRP, respectively.

[0097] In some aspects, UE 120 may determine an uplink beam that corresponds to a beam used by UE 120 to monitor a CORESET, as described above. In this case, the uplink beam may be decoupled from (e.g., not correspond to) a determined PDSCH beam for a TRP (e.g., the PDSCH beam may not be determined based on the beam used by UE 120 to monitor a CORESET). In some aspects, the uplink beam may correspond to a determined PDSCH beam for a TRP. For example, if a PDSCH beam is determined for a TRP, the uplink beam may correspond to the PDSCH beam. As another example, if first and second PDSCH beams are determined for a first TRP (TRP-1) and a second TRP (TRP-2), respectively, the uplink beam may correspond to one of the first and second PDSCH beams. For example, UE 120 may select the first or second PDSCH beam based on one or more criteria, or may receive an indication of the first or second PDSCH beam to select (eg, via RRC, MAC-CE, DCI, etc.).

[0098] In some aspects, UE 120 may determine a first uplink beam and a second uplink beam for transmitting (e.g., concurrently) a PUCCH or SRS to a first TRP (TRP-1) and a second TRP (TRP-2), respectively. In some aspects, as described above, UE 120 may transmit the PUCCH or SRS in PUCCH resources or SRS resources associated with the first TRP and the second TRP, respectively.

[0099] In some aspects, as described above, the first and second uplink beams can be decoupled from (e.g., not correspond to) the first and second PDSCH beams determined for the first TRP and the second TRP. In some aspects, the first and second uplink beams can correspond to the determined first and second PDSCH beams, respectively.

[0100] In some aspects, as described above, UE 120 may determine the first and second uplink beams based at least in part on a TCI code point mapping. For example, UE 120 may determine the first uplink beam based at least in part on a first value (e.g., a first TCI state) in a first TCI state pair of the TCI code point mapping, and may determine the second uplink beam based at least in part on a second value (e.g., a second TCI state) in a second TCI state pair of the TCI code point mapping. In this case, the first TCI state pair and the second TCI state pair may be the same TCI state pair or different TCI state pairs. In some aspects, the first value may be the lowest or highest TCI state identifier of the first value in the TCI state pair of the TCI code point mapping, and the second value may be the lowest or highest TCI state identifier of the second value in the TCI state pair of the TCI code point mapping.

[0101] In some aspects, the UE 120 may select a TCI state pair from one or more TCI state pairs identified by the TCI code point mapping, and the first and second uplink beams may be associated with the TCI state pair, respectively. For example, the UE 120 may select the TCI state pair with the lowest or highest sum of TCI state identifiers among the TCI state pairs of the TCI code point mapping. As another example, the UE 120 may select the TCI state pair that is the first (e.g., in chronological order) TCI state pair of the TCI code point mapping.

[0102] In some aspects, as described above, the UE 120 may determine a first uplink beam based at least in part on a beam used by the UE 120 to monitor a CORESET (or based at least in part on another beam, such as a first beam indicated by a TCI state pair), and may determine a second uplink beam based at least in part on a mapping (e.g., a TCI code point mapping or another mapping). For example, if the determined first uplink beam is associated with a TCI state that matches a first TCI state in a TCI state pair of a TCI code point mapping, the UE 120 may determine the second uplink beam based at least in part on a second TCI state in the TCI state pair. As another example, as described above, if the TCI state associated with the determined first uplink beam does not match a TCI state in a TCI state pair of a TCI code point mapping, the UE 120 may determine the second uplink beam based at least in part on a QCL source associated with the first uplink beam. In some aspects, UE 120 may determine the second uplink beam based at least in part on the determined first uplink beam. For example, UE 120 may determine the second uplink beam based on a mapping of the first beam to the second beam. In this case, UE 120 may receive the mapping via RRC signaling, MAC-CE, DCI, etc.

[0103] In some aspects, UE 120 may determine the first and second uplink beams based at least in part on an indication (e.g., provided by TRP-1, TRP-2, or another BS 110) that the first and second uplink beams are to be used. UE 120 may receive the indication via RRC signaling, MAC-CE, DCI, etc. In some aspects, as described above, the indication or another indication received by UE 120 may indicate an mTRP mode and a beam switching mode to be used with the first and second uplink beams. For example, in the case of time division multiplexing, the beam switching mode may indicate that the first uplink beam is to be used for even symbols of a time slot, while the second uplink beam is to be used for odd symbols of a time slot.

[0104] In some aspects, the first uplink beam or the second uplink beam may correspond to a beam used by UE 120 to receive a PL RS. For example, according to a power control procedure, UE 120 may determine the transmit power of a resource based at least in part on the PL RS received by UE 120 using the receive beam. In this case, UE 120 may transmit a PUCCH or SRS in the resource using the uplink beam corresponding to the receive beam. In some aspects, the PL RS may be associated with a single TRP (e.g., TRP-1 or TRP-2) in a TRP set. For example, as described above, the PL RS may be associated with a TRP based on a determined association between the resource and the TRP or based on a TRP index configured for the PL RS. In some aspects, if more than one PL RS is associated with a TRP, and therefore more than one uplink beam may be associated with the TRP, UE 120 may select an uplink beam (e.g., an uplink beam associated with the first PL RS configured for the UE) for use with the TRP.

[0105] In some aspects, a default PL RS (e.g., as described above, used to determine the first uplink beam or the second uplink beam) may be a downlink reference signal indicating a default PDSCH beam. For example, a default PL RS used to determine the first uplink beam for a first TRP (TRP-1) may be a downlink reference signal indicating the default PDSCH beam for the first TRP (TRP-1).

[0106] In some aspects (e.g., for a single DCI schedule for multiple TRPs), the downlink reference signal for the TRP may be a QCL reference signal (e.g., a QCL source) associated with the TCI state indicated by the default TCI code point for the TRP. The QCL reference signal may be for QCL type A (e.g., Doppler shift, Doppler spread, average delay, and delay spread), QCL type B (e.g., Doppler shift and Doppler spread), QCL type C (e.g., Doppler shift and average delay), or QCL type D. If the TCI state is associated with more than one QCL type, the QCL reference signal may be for QCL type D.

[0107] In some aspects (e.g., for multi-DCI scheduling for multiple TRPs), the downlink reference signal for a TRP may be a QCL reference signal for a QCL hypothesis for a receiving CORESET (e.g., a QCL source). The CORESET may be associated with the lowest identifier among the CORESETs associated with the same TRP index as the TRP. The CORESET may be located in a most recently monitored timeslot where at least one CORESET is associated with the same TRP index as the TRP. The QCL reference signal may be for QCL type A, QCL type B, QCL type C, or QCL type D. If the QCL hypothesis is associated with more than one QCL type, the QCL reference signal may be for QCL type D.

[0108] In some aspects, UE 120 may determine one or more first uplink beams (e.g., multiple first uplink beams) and one or more second uplink beams (e.g., multiple second uplink beams) to use for transmitting (e.g., concurrently) a PUCCH or SRS to a first TRP (TRP-1) and a second TRP (TRP-2), respectively. In some aspects, as described above, the one or more first uplink beams or the one or more second uplink beams may correspond to one or more beams used by UE 120 to receive PL RSs. In some aspects, the number of the one or more first uplink beams or the one or more second uplink beams may correspond to the number of PL RSs configured for UE 120 (e.g., four PL RSs). Accordingly, the one or more first uplink beams may be associated with the first TRP (TRP-1), and the one or more second uplink beams may be associated with the second TRP (TRP-2).

[0109] like Figure 7, and as further shown by reference numeral 730, UE 120 may communicate with a set of TRPs using one or more beams. That is, UE 120 may receive PDSCH from a first TRP (TRP-1) and / or a second TRP (TRP-2) using one or more beams, and / or may transmit PUCCH or SRS to the first TRP and / or the second TRP using one or more beams. For example, based at least in part on a beam determined to be used for reception from the first TRP (e.g., a default beam), UE 120 may receive PDSCH from the first TRP using the beam. As another example, based at least in part on a beam determined to be used for transmission to the first TRP (e.g., a default beam), UE 120 may transmit PUCCH or SRS to the first TRP using the beam.

[0110] As indicated above, Figure 7 are provided as examples. Other examples may differ from those described in Figure 7 Examples described.

[0111] Figure 8 is a diagram illustrating an example process 800, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 800 is an example of operations in which a UE (eg, UE 120, etc.) performs beam selection for communication in a multiple transmission reception point deployment.

[0112] As in Figure 8 As shown in FIG, in some aspects, process 800 may include determining, based at least in part on determining that the scheduling offset is less than a beam switching latency threshold, at least in part on at least one of a TCI code point mapping or a CORESET configuration, a beam set for communicating with a TRP set scheduled using a single downlink control information, wherein the beam set includes one or more PDSCH beams (block 810). For example, a UE (e.g., using the controller / processor 280, etc.) may determine, based at least in part on determining that the scheduling offset is less than a beam switching latency threshold, at least in part on at least one of a TCI code point mapping or a CORESET configuration, a beam set for communicating with a TRP set scheduled using a single downlink control information, as described above. In some aspects, the beam set includes one or more PDSCH beams.

[0113] like Figure 8As further shown in FIG. 8 , in some aspects, process 800 may include, based at least in part on determining the beam set, using the beam set to communicate with the TRP set (block 820). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may, based at least in part on determining the beam set, use the beam set to communicate with the TRP set, as described above.

[0114] 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.

[0115] In a first aspect, determining a beam set includes determining a beam in the beam set based at least in part on a beam used to monitor a CORESET.

[0116] In a second aspect, alone or in combination with the first aspect, determining the beam set includes determining a first beam in the beam set for a first TRP in the TRP set, and a second beam in the beam set for a second TRP in the TRP set.

[0117] In a third aspect, alone or in combination with one or more of the first and second aspects, the first beam and the second beam are associated with a TCI state pair selected from one or more TCI state pairs identified by a TCI codepoint mapping.

[0118] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the first beam is determined at least in part based on a beam used to monitor a CORESET, and the second beam is determined at least in part based on a TCI codepoint mapping. In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the first beam is associated with a first TCI state in a TCI state pair identified by the TCI codepoint mapping, and the second beam is associated with a second TCI state in the TCI state pair.

[0119] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first beam is associated with a QCL type D source, the first TCI state in a TCI state pair identified by a TCI code point mapping is associated with the same QCL type D source as the first beam, and the second beam is associated with the second TCI state in the TCI state pair.

[0120] although Figure 8 Example blocks of process 800 are shown, but in some aspects, process 800 may include Figure 88. In some embodiments, the process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in FIG. Additionally or alternatively, two or more blocks of process 800 may be executed in parallel.

[0121] Figure 9 is a diagram illustrating an example process 900, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 900 is an example of operations in which a UE (eg, UE 120, etc.) performs beam selection for communication in a multiple transmission reception point deployment.

[0122] As in Figure 9 As shown in FIG, in some aspects, process 900 may include determining a beam set with an unconfigured spatial relationship for communicating with a TRP set based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, wherein the beam set includes one or more PUCCH beams or one or more SRS beams (block 910). For example, a UE (e.g., using controller / processor 280, etc.) may determine a beam set with an unconfigured spatial relationship for communicating with a TRP set based at least in part on at least one of a TCI code point mapping, a CORESET configuration, or a path loss reference signal configuration, as described above. In some aspects, the beam set includes one or more PUCCH beams or one or more SRS beams.

[0123] like Figure 9 As further shown in FIG. 1 , in some aspects, process 900 may include, based at least in part on determining the beam set, using the beam set to communicate with the TRP set (block 920). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 206, MOD 254, antenna 252, etc.) may, based at least in part on determining the beam set, use the beam set to communicate with the TRP set, as described above.

[0124] Process 900 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.

[0125] In the first aspect, process 900 further includes determining an association of resources to be used for transmitting SRS or PUCCH with one or more TRPs in the TRP set.

[0126] In a second aspect, alone or in combination with the first aspect, the association of a resource is an association with a TRP in a set of TRPs. In a third aspect, alone or in combination with one or more of the first and second aspects, the association of a resource with a TRP is based at least in part on an identifier of the resource. In a fourth aspect, alone or in combination with one or more of the first to third aspects, the association of a resource with a TRP is based at least in part on a closed-loop power control index associated with the resource. In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the association of a resource with a TRP is based at least in part on a PUCCH group identifier associated with the resource.

[0127] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the association of the resource is an association with a plurality of TRPs in a set of TRPs. In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the process 900 further comprises receiving a configuration identifying at least one of a multiplexing mode or a beam switching mode to be used for the resource.

[0128] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, determining the beam set comprises determining a beam in the beam set based at least in part on a beam used to monitor a CORESET. In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the beam does not correspond to a PDSCH beam determined for a TRP.

[0129] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, determining the beam set includes determining a first beam in the beam set for a first TRP in the TRP set, and a second beam in the beam set for a second TRP in the TRP set. In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the first beam or the second beam does not correspond to a PDSCH beam determined for the TRP set.

[0130] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, a first beam is determined based at least in part on a first value of a TCI codepoint map, and a second beam is determined based at least in part on a second value of the TCI codepoint map. In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the first beam and the second beam are associated with a TCI state pair selected from a plurality of TCI state pairs identified by the TCI codepoint map.

[0131] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the first beam is determined at least in part based on a beam used to monitor a CORESET, and the second beam is determined at least in part based on a mapping. In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the mapping is a TCI codepoint mapping, the first beam is associated with a first TCI state in a TCI state pair identified by the TCI codepoint mapping, and the second beam is associated with a second TCI state in the TCI state pair. In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the mapping is a TCI codepoint mapping, the first beam is associated with a QCL type D source, the first TCI state in the TCI state pair identified by the TCI codepoint mapping is associated with the same QCL type D source as the first beam, and the second beam is associated with the second TCI state in the TCI state pair. In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the mapping is a mapping of the first beam to the second beam, and the second beam is determined based at least in part on the first beam according to the mapping.

[0132] In an eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, process 900 further includes receiving an indication that the first beam and the second beam are to be used, and the first beam and the second beam are determined based at least in part on the indication.

[0133] In a nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the first beam or the second beam corresponds to a beam for receiving a path loss reference signal.

[0134] In the 20th aspect, alone or in combination with one or more of the first to nineteenth aspects, determining the beam set comprises: determining one or more first beams in the beam set for a first TRP in the TRP set, and one or more second beams in the beam set for a second TRP in the TRP set. In the 21st aspect, alone or in combination with one or more of the first to twentieth aspects, the one or more first beams or the one or more second beams correspond to one or more beams for receiving a path loss reference signal. In the 22nd aspect, alone or in combination with one or more of the first to twenty-first aspects, the path loss reference signal is a downlink reference signal indicating a default downlink beam for the first TRP or the second TRP.

[0135] In a twenty-third aspect, alone or in combination with one or more of aspects one to twenty-second, determining the beam set comprises determining a beam in the beam set based at least in part on a PDSCH beam determined for the TRP set.

[0136] In aspect twenty-four, alone or in combination with one or more of aspects one to twenty-three, determining a beam set includes determining a first beam in the beam set for a first TRP in the TRP set, and a second beam in the beam set for a second TRP in the TRP set, based at least in part on corresponding PDSCH beams determined for the TRP set.

[0137] although Figure 9 Example blocks of process 900 are shown, but in some aspects, process 900 may include Figure 9 900. Additionally or alternatively, two or more blocks of process 900 may be executed in parallel.

[0138] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

[0139] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software.

[0140] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0141] It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software code—it is understood that software and hardware can be designed to implement these systems and / or methods based, at least in part, on the description herein.

[0142] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase "at least one" quoting a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to encompass: a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other arrangement of a, b and c).

[0143] The elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items and can be used interchangeably with "one or more". Furthermore, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, a combination of related and non-related items, etc.) and can be used interchangeably with "one or more". Where intended to have only one item, the phrase "only one" or similar language is used. Furthermore, as used herein, the terms "having", "containing", "comprising" etc. are intended to be open terms. Furthermore, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: determining a beam set for communicating with a set of transmit reception points (TRPs) scheduled using a single downlink control information based at least in part on a determination that a scheduling offset is less than a beam switching latency threshold, an association of a resource set with a set of transmit reception points (TRPs) scheduled using a single downlink control information, and at least one of a transmission configuration indicator (TCI) codepoint mapping or a control resource set (CORESET) configuration, wherein the beam set includes a first beam corresponding to a first TRP in the TRP set and a second beam corresponding to a second TRP in the TRP set, and wherein the beam set includes one or more physical downlink shared channel (PDSCH) beams; as well as Communicating with the set of TRPs using the beam set based at least in part on determining the beam set.

2. The method of claim 1 , wherein determining the beam set comprises: The first beam or the second beam is determined based at least in part on a beam used to monitor a CORESET.

3. The method of claim 1 , wherein determining the beam set comprises: Determine the first beam in the beam set for the first TRP in the TRP set, and the second beam in the beam set for the second TRP in the TRP set.

4. The method of claim 3, wherein the TCI codepoints in the TCI codepoint map are mapped to a plurality of TCI states, and The first beam and the second beam are associated with a TCI state pair selected from one or more TCI state pairs identified by the TCI code point mapping.

5. The method of claim 3, wherein the first beam is determined based at least in part on a beam used to monitor a CORESET, and the second beam is determined based at least in part on the TCI codepoint mapping.

6. The method of claim 5, wherein the first beam is associated with a first TCI state in a TCI state pair identified by the TCI code point mapping, and the second beam is associated with a second TCI state in the TCI state pair.

7. The method of claim 5, wherein the first beam is associated with a quasi-colocated (QCL) type D source, wherein a first TCI state of a TCI state pair identified by the TCI codepoint map is associated with the same QCL type D source as the first beam, and The second beam is associated with a second TCI state in the TCI state pair.

8. A wireless communication method performed by a user equipment (UE), comprising: determining a beam set of unconfigured spatial relationships for communicating with a set of transmit-receive points (TRPs) based at least in part on at least one of a transmission configuration indicator (TCI) codepoint mapping, a control resource set (CORESET) configuration, or a path loss reference signal configuration, wherein the beam set comprises one or more physical uplink control channel (PUCCH) beams or one or more sounding reference signal (SRS) beams; and Communicating with the set of TRPs using the beam set based at least in part on determining the beam set.

9. The method of claim 8, further comprising: Determine the association of resources to be used for transmitting SRS or PUCCH with one or more TRPs in the TRP set.

10. The method of claim 9, wherein the association of the resource is an association with a TRP in the set of TRPs.

11. The method of claim 10, wherein the association of the resource with the TRP is based at least in part on an identifier of the resource.

12. The method of claim 10, wherein the association of the resource with the TRP is based at least in part on a closed-loop power control index associated with the resource.

13. The method of claim 10, wherein the association of the resource with the TRP is based at least in part on a PUCCH group identifier associated with the resource.

14. The method of claim 9, wherein the association of the resource is an association with multiple TRPs in the TRP set.

15. The method of claim 14, further comprising: A configuration is received that identifies at least one of a multiplexing pattern or a beam switching pattern to be used for the resources.

16. The method of claim 8, wherein determining the beam set comprises: The beams in the beam set are determined based at least in part on the beams used to monitor the CORESET.

17. The method of claim 16, wherein the beam does not correspond to a physical downlink shared channel beam determined for a TRP.

18. The method of claim 8, wherein determining the beam set comprises: Determine a first beam in the beam set for a first TRP in the TRP set, and a second beam in the beam set for a second TRP in the TRP set.

19. The method of claim 18, wherein the first beam or the second beam does not correspond to a physical downlink shared channel beam determined for the TRP set.

20. The method of claim 18, wherein the first beam is determined based at least in part on a first value of the TCI codepoint map, and the second beam is determined based at least in part on a second value of the TCI codepoint map.

21. The method of claim 18, wherein the first beam and the second beam are associated with a TCI state pair selected from a plurality of TCI state pairs identified by the TCI codepoint map.

22. The method of claim 18, wherein the first beam is determined based at least in part on a beam used to monitor a CORESET, and the second beam is determined based at least in part on a mapping.

23. The method of claim 22, wherein the mapping is the TCI code point mapping, and The first beam is associated with a first TCI state in a TCI state pair identified by the TCI code point mapping, and the second beam is associated with a second TCI state in the TCI state pair.

24. The method of claim 22, wherein the mapping is the TCI code point mapping, wherein the first beam is associated with a quasi-colocated (QCL) type D source, wherein a first TCI state of a TCI state pair identified by the TCI codepoint map is associated with the same QCL type D source as the first beam, and The second beam is associated with a second TCI state in the TCI state pair.

25. The method of claim 22, wherein the mapping is a mapping of a first beam to a second beam, and Wherein the second beam is determined based at least in part on the first beam according to the mapping.

26. The method of claim 18, further comprising receiving an indication to use the first beam and the second beam, and Wherein the first beam and the second beam are determined based at least in part on the indication.

27. The method of claim 18, wherein the first beam or the second beam corresponds to a beam for receiving a path loss reference signal.

28. The method of claim 27, wherein the path loss reference signal is a downlink reference signal indicating a default downlink beam for the first TRP or the second TRP.

29. The method of claim 8, wherein determining the beam set comprises: Determine one or more first beams in the beam set for a first TRP in the TRP set, and one or more second beams in the beam set for a second TRP in the TRP set.

30. The method of claim 29, wherein the one or more first beams or the one or more second beams correspond to one or more beams for receiving a path loss reference signal.

31. The method of claim 8, wherein determining the beam set comprises: The beams in the beam set are determined based at least in part on the physical downlink shared channel beams determined for the TRP set.

32. The method of claim 8, wherein determining the beam set comprises: A first beam in the beam set for a first TRP in the TRP set and a second beam in the beam set for a second TRP in the TRP set are determined at least in part based on corresponding physical downlink shared channel beams determined for the TRP set.

33. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determining a beam set for communicating with a set of transmit reception points (TRPs) scheduled using a single downlink control information based at least in part on a determination that a scheduling offset is less than a beam switching latency threshold, an association of a resource set with a set of transmit reception points (TRPs) scheduled using a single downlink control information, and at least one of a transmission configuration indicator (TCI) codepoint mapping or a control resource set (CORESET) configuration, wherein the beam set includes a first beam corresponding to a first TRP in the TRP set and a second beam corresponding to a second TRP in the TRP set, and wherein the beam set includes one or more physical downlink shared channel (PDSCH) beams; as well as Communicating with the set of TRPs using the beam set based at least in part on determining the beam set.

34. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors configured to perform the method of any one of claims 2-7.

35. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determining a beam set of unconfigured spatial relationships for communicating with a set of transmit-receive points (TRPs) based at least in part on at least one of a transmission configuration indicator (TCI) codepoint mapping, a control resource set (CORESET) configuration, or a path loss reference signal configuration, wherein the beam set comprises one or more physical uplink control channel (PUCCH) beams or one or more sounding reference signal (SRS) beams; and Communicating with the set of TRPs using the beam set based at least in part on determining the beam set.

36. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors configured to perform the method of any one of claims 9-32.

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