WO2021142659A1

WO2021142659A1 - Pucch transmission with multiple spatial relations based on pdcch and pucch resource parameters

Info

Publication number: WO2021142659A1
Application number: PCT/CN2020/072233
Authority: WO
Inventors: Min Huang; Chao Wei; Jing Dai
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2021-07-22
Anticipated expiration: 2022-07-15

Abstract

This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for a PUCCH transmission with multiple spatial relations based on PDCCH and PUCCH resource parameters. An indication of one or more spatial relations for an uplink control channel is received by a UE. The UE determines whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations. Based on the determination, the UE transmits the uplink control channel to a base station using the single spatial relation or the multiple spatial relations.

Description

PUCCH TRANSMISSION WITH MULTIPLE SPATIAL RELATIONS BASED ON PDCCH AND PUCCH RESOURCE PARAMETERS

BACKGROUND

Technical Field

The present disclosure relates generally to communication systems, and more particularly, to wireless communication based on a spatial relation.

Introduction

Wireless communication systems are widely deployed to provide various 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. 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is fifth-generation (5G) New Radio (NR) . 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra reliable low latency communications (URLLC) . Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

High frequencies used for signal transmissions, such as in 5G NR applications, may have a higher penetration and path loss than other signals transmitted at lower frequencies. In many cases, the high penetration and path loss may reduce a coverage area of the transmissions in comparison to a coverage area of lower frequency transmissions. Further, a physical uplink control channel (PUCCH) resource having only a single spatial relation may not provide a desirable diversity gain. For example, when a beam defined for the single spatial relation is blocked by an object or interfered with by another signal, a base station may not receive the PUCCH. Such blocking or interfering may result in variations in conditions that occur more quickly than a medium access control-control element (MAC-CE) is able to update the spatial relation for the PUCCH. Therefore, multiple spatial relations may help to improve diversity gain for the PUCCH, reduce a probability that the PUCCH will be blocked or interfered with, and enhance a coverage area of the PUCCH.

Accordingly, a user equipment (UE) may receive from a base station an indication of one or more spatial relations for the PUCCH. Spatial relation parameters of the PUCCH may be associated with either parameters of one or more PDCCH resources, configured multiple spatial relation parameters of a PUCCH resource, or a combination of both. Based on the associated parameters, the UE may determine whether to transmit the PUCCH using a single spatial relation or multiple spatial relations. The base station may receive the PUCCH from the UE using the single spatial relation or the multiple spatial relations and further in accordance with the indication received from the base station and the determination by the UE.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication. The apparatus may be a wireless device at a UE that includes a memory and at least one processor coupled to the memory. The memory may include instructions that, when executed by the processor, causes the processor to receive an indication of one or more spatial relations for an uplink control channel and determine whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations. Based on the determination, the at least one processor is further configured to transmit the uplink control channel using the single spatial relation or the multiple spatial relations.

In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication. The apparatus may be a wireless device at a base station that includes a memory and at least one processor coupled to the memory. The memory may include instructions that, when executed by the processor, causes the processor to transmit, to a UE, an indication of one or more spatial relations for an uplink control channel and receive, based on the indication, the uplink control channel from the UE using a single spatial relation or multiple spatial relations.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.

FIGs. 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first 5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame, and UL channels within a 5G/NR subframe, respectively.

FIG. 3 is a diagram illustrating an example of a base station and UE in an access network.

FIG. 4 illustrates a system model that includes multiple transmit reception points (TRPs) .

FIG. 5 is a call flow diagram illustrating communications between a UE and a base station.

FIGs. 6A, 6B, and 6C illustrate different resource configurations based on multiple spatial relations of a PUCCH.

FIG. 7 illustrates a diagram where spatial relations of a PUCCH are indicated by parameters of a PDCCH resource.

FIG. 8 is a flowchart of a method of wireless communication at a UE.

FIG. 9 is a flowchart of a method of wireless communication at a base station.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

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

By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) . The base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) . The macrocells include base stations. The small cells include femtocells, picocells, and microcells.

The base stations 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) ) may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface) . The base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN) ) may interface with core network 190 through second backhaul links 184. In addition to other functions, the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages. The base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface) . The third backhaul links 134 may be wired or wireless.

The base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) . The communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) . The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .

Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) . D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum. When communicating in an unlicensed frequency spectrum, the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

The small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.

A base station 102, whether a small cell 102' or a large cell (e.g., macro base station) , may include and/or be referred to as an eNB, gNodeB (gNB) , or another type of base station. Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE 104. When the gNB 180 operates in mmW or near mmW frequencies, the gNB 180 may be referred to as an mmW base station. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW /near mmW radio frequency band (e.g., 3 GHz –300 GHz) has extremely high path loss and a short range. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range. The base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.

The base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182'. The UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182”. The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104. The transmit and receive directions for the base station 180 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176. The IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.

The core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195. The UPF 195 provides UE IP address allocation as well as other functions. The UPF 195 is connected to the IP Services 197. The IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.

The base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a TRP, or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) . The UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

Referring again to FIG. 1, in certain aspects, the UE 104 may include a spatial relation component 198 configured to receive an indication of one or more spatial relations for an UL control channel and to determine whether to transmit the UL control channel using a single spatial relation or multiple spatial relations; and transmit the UL control channel based on the determination. The base station 102/180 may include a spatial relation component 199 configured to transmit, to a UE, an indication of one or more spatial relations for an uplink control channel and receive, based on the indication, the uplink control channel from the UE using a single spatial relation or multiple spatial relations. Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure. FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe. FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure. FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe. The 5G/NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by FIGs. 2A, 2C, the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) . While

subframes

3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) . Note that the description infra applies also to a 5G/NR frame structure that is TDD.

Other wireless communication technologies may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms) . Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) . The number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies μ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols/slot and 2 ^μ slots/subframe. The subcarrier spacing and symbol length/duration are a function of the numerology. The subcarrier spacing may be equal to 2 ^μ*15 kHz, where μ is the numerology 0 to 5. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=5 has a subcarrier spacing of 480 kHz. The symbol length/duration is inversely related to the subcarrier spacing. FIGs. 2A-2D provide an example of slot configuration 0 with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.

A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R _x for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .

FIG. 2B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS. The physical broadcast channel (PBCH) , which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) . The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the PUCCH and DM-RS for the physical uplink shared channel (PUSCH) . The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS) . The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

FIG. 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ acknowledgement (ACK) /negative acknowledgement (NACK) feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller/processor 375. The controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a RRC layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) . The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.

At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) . The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.

The controller/processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DL transmission by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer- readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160. The controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with 198 of FIG. 1.

At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with 199 of FIG. 1.

Wireless communication systems may be configured to share available system resources and provide various telecommunication services (e.g., telephony, video, data, messaging, broadcasts, etc. ) based on multiple-access technologies such as CDMA systems, TDMA systems, FDMA systems, OFDMA systems, SC-FDMA systems, TD-SCDMA systems, etc. that support communication with multiple users. In many cases, common protocols that facilitate communications with wireless devices are adopted in various telecommunication standards. For example, communication methods associated with eMBB, mMTC, and URLLC may be incorporated in the 5G NR telecommunication standard, while other aspects may be incorporated in the 4G LTE standard. As mobile broadband technologies are part of a continuous evolution, further improvements in mobile broadband remain useful to continue the progression of such technologies.

FIG. 4 illustrates a system model 400 having multiple TRPs 406-408, which may include two or more TRPs. With more specificity, the system model 400 includes a UE 402 and a base station 404 that communicate with each other via the multiple TRPs 406-408. Each of the multiple TRPs 406-408 is configured to provide separate transmissions and receptions of UL and DL signals. The base station 404 may be equipped with the multiple TRPs 406-408, thereby providing multiple DL transmission paths to the UE 402 and multiple UL reception paths from the UE 402. That is, in addition to receiving DL signals from the base station 404 via the multiple TRPs 406-408, the UE 402 may similarly be configured to transmit UL signals to the base station 404 via the multiple TRPs 406-408.

To provide multi-TRP transmission for a PDSCH, the base station 404 may transmit DL signals from the multiple TRPs 406-408 to the UE 402 over multiple PDSCH links. Such links may be indicated by a same DCI or different DCIs. The multi-TRP transmissions for the PDSCH may enhance diversity gain, DL system capabilities, and/or DL cell coverage. Moreover, a PUCCH resource may be configured to transmit ACK/NACK for the multi-TRP-based PDSCH in a manner that provides single TRP transmission or multi-TRP transmission for the PUCCH resource. For example, the UE 402 may transmit ACK/NACK sequentially in the PUCCH (e.g., in a TDM fashion to a single TRP of the TRPs 406-408) or in some other manner, such as over multiple PUCCH links, to provide feedback for the multi-TRP-based PDSCH via more than one TRP. A coverage area of the UL signal may be enhanced by the multi-TRP transmission from the UE 402.

Aspects presented herein improve coverage, such as coverage for NR based communication. Aspects may more particularly improve coverage for uplink transmissions, such as PUCCH. Aspects presented herein may help to improve coverage for communication using higher frequencies. For example, an NR transmission having a frequency of 3.5 GHz may have a higher penetration and path loss than another transmission having a lower frequency (e.g., a LTE transmission) . The higher penetration and path loss may reduce a coverage area of the NR transmission in comparison to a coverage area of the lower frequency transmission. Improved PUCCH coverage may improve feedback with by increasing a number of bits received by a base station about reception of a multi-TRP-based PDSCH. A number of ACK/NACK bits transmitted from the UE 402 may be increased due to an increased number of code blocks within a transport block, an increased number of bundled DL slots, and/or an increased number of carrier aggregation component cells.

The UE 402 may be configured with one or more PUCCH spatial relations. A spatial relation may be defined by a set of transmission parameters such as a serving Cell ID, a reference signal, PUCCH Pathloss Reference RS ID, a PUCCH power control parameter ID (e.g., p0-PUCCH-Id) , closed loop index, etc. The reference Signal may be a synchronization signal, a CSI-RS, or an SRS. Therefore, the spatial relation may be based on an SSB Index, a CSI-RS index, and/or an SRS resource index, etc. A PUCCH resource may be associated with a single spatial relation in a semi-persistent manner, which may be updated by a MAC-CE. Based on an associated single spatial relation of the PUCCH, the UE 402 may determine a single set of PUCCH transmission parameters. For example, the UE 402 may determine a transmission beam based on a reference signal value.

In some cases, a PUCCH resource having a single spatial relation may provide an undesirable diversity gain. For instance, when the beam defined for the single spatial relation of the PUCCH is blocked by an object or interfered with by another signal, the base station 404 may not receive the PUCCH resource. Such blocking or interfering may vary dynamically (e.g., on a slot or sub-slot basis) and provide conditions where the MAC-CE needs to adapt a spatial relation at a rate that is faster than the MAC-CE is configured to perform such updates. Therefore, aspects presented herein help a UE to use multiple spatial relations for a PUCCH to improve diversity gain, reduce a probability that the PUCCH will be blocked or interfered with, and enhance the PUCCH coverage area.

FIG. 5 is a call flow diagram 500 illustrating communications between a UE 502 and a base station 504. At 506, the UE 502 receives an indication from the BS 504 of one or more spatial relations for an uplink control channel. The indication may include a downlink control channel parameter that triggers feedback in the uplink control channel and/or include a configuration of an uplink control channel resource with multiple spatial relations. At 508, an uplink control channel resource of the UE 502 may be configured with multiple spatial relations; and, at 510, the UE 502 determines whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations. At 514, the UE 502 transmits the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common DL control channel parameter 512. When the multiple downlink control channels that trigger the feedback have different DL control channel parameters 516, the UE 502 may select the multiple spatial relations, at 518, based on the different DL control parameters 516 of the multiple downlink control channels; and, at 520, transmit the uplink control channel using the multiple spatial.

The UE 502 may receive an indication from the base station 504 for transmitting a PUCCH with multiple spatial relations. In a first example, the UE 502 may associate spatial relation parameters of the PUCCH with parameters of one or more PDCCH resources, which indicate parameters of one or more PDSCHs. The PUCCH (s) may then feedback ACK/NACK to the base station 504 for the one or more PDSCHs. In a second example, the UE 502 may associate the spatial relation parameters of the PUCCH with multiple spatial relation parameters configured for a PUCCH resource. The UE 402 may then transmit the PUCCH in the PUCCH resource according to one or more DCI of the PDSCH (e.g., according to a DCI format of 1_0 or 1_1) . In a third example, described further with respect to FIG. 7, the UE 502 may associate multiple spatial relation parameters with a PUCCH based on a combination of aspects that relate to the first example and the second example.

An indication of the multiple spatial relation parameters of the PUCCH may be provided in various ways. For example, the multiple spatial relation parameters may be based on the PDCCH resource, the PUCCH resource, or a combination thereof (e.g., the PUCCH may be determined based on both the PDCCH resource and the PUCCH resource) . Upon receiving the indication from the base station 504, the UE 502 transmits the PUCCH in accordance with the indicated spatial relations of the PUCCH. If the indicated PUCCH has a single spatial relation, the UE 502 transmits the PUCCH with the single spatial relation. If the indicated PUCCH has multiple spatial relations, the UE 502 transmits the PUCCH with the multiple spatial relations.

In the first example, the UE 502 may receive one or more PDCCH resources that cause ACK/NACK to be transmitted back to the base station 504 in the PUCCH resource. The UE 502 may determine the spatial relations of the PUCCH resource based on the parameters of the one or more PDCCH resources, such as a control channel element (CCE) index, a control resource set (CORESET) index, a CORESET pool index, a component cell index of the CORESET, a bandwidth part (BWP) index of the CORESET, etc. If the one or more PDCCH resources have a common parameter value, the PUCCH from the UE 502 has a single spatial relation. That is, even if the PUCCH is associated with multiple PDCCH resources, the PUCCH may have a single spatial relation when the multiple PDCCH resources have the same parameters. For example, the multiple PDCCH resources may have a common CORESET index value, which indicates a single spatial relation of the PUCCH. A CORESET index value is a non-negative integer that is used to index the spatial relation.

If the one or more PDCCH resources have different parameter values, (e.g., different CORESET index values) , the PUCCH has multiple spatial relations indicated by the different parameter values (e.g., the different CORESET index values) of the PDCCH resources. The spatial relation (s) of a PUCCH may be associated with the CORESET index of the one or more PDCCH resources, such that a CORESET index value may indicate a spatial relation from a set of pre-configured spatial relations. The set of pre-configured spatial relations may be configured by RRC signaling, MAC-CE, DCI, or a combination thereof.

FIGs. 6A-6C illustrate different resource configurations based on multiple spatial relations of a PUCCH. The UE 502 transmits the PUCCH based on the determined spatial relations. The UE 502 may utilize transmission parameters within the spatial relations to determine a transmission beam, a transmission power, etc.

In FIG. 6A, the resources are arranged in a time division multiplex (TDM) manner. More specifically, a radio resource of the PUCCH is split in the time domain into multiple parts. The multiple parts correspond in number to a same number as that of the spatial relations of the PUCCH. Each part of the radio resource may be utilized by the UE 502 to transmit the PUCCH based on different spatial relations. For example, as shown in FIG. 6A, the UE 502 transmits a first part 614 of an uplink control channel using a first spatial relation at a first time 610 and transmits a second part 616 of the uplink control channel using a second spatial relation at a second time 612.

In FIG. 6B, the resources are arranged in a frequency division multiplex (FDM) manner. More specifically, a radio resource of the PUCCH is split in the frequency domain into multiple parts. The multiple parts correspond in number to a same number as that of the spatial relations of the PUCCH. Each part of the radio resource is utilized by the UE 502 to transmit the PUCCH based on different spatial relations. For example, as shown in FIG. 6B, the UE 502 transmits a first part 624 of an uplink control channel using a first spatial relation at a first frequency 620 and transmits a second part 626 of the uplink control channel using a second spatial relation at a second frequency 622. The UE 502 may transmit the first part 624 of the uplink control channel using the first spatial relation at the first frequency 620 and then hop to a different frequency at which the UE 502 transmits the second part 626 of the uplink control channel using the second spatial relation.

In FIG. 6C, the resources are arranged in a spatial division multiplex (SDM) manner. More specifically, a transmit power of the PUCCH is split into multiple parts, such that a sum of all the transmit power parts accumulates to a total transmit power. The multiple parts correspond in number to a same number as that of the spatial relations of the PUCCH. Each part of the transmit power is transmitted by the UE 502 (e.g., at a same radio resource) based on the different spatial relations. Thus, the parts of the transmit power may overlap in time and/or frequency. As shown in FIG. 6C, the UE 502 transmits a first part 634 of an uplink control channel using a first spatial relation and a first portion 630 of a transmit power and transmits a second part 636 of the uplink control channel using a second spatial relation and a second portion 632 of the transmit power at a same radio resource.

In regard to the second example, the base station 504 may indicate to the UE 502 that the PUCCH resource is to be configured with multiple spatial relations. For example, the base station 504 may cause the PUCCH resource to be configured with multiple spatial relations based on RRC signaling. In another example, the base station 504 may cause the PUCCH resource to be configured with a set of spatial relations based on the RRC signaling and subsequently associate multiple spatial relations from the set of spatial relations with the PUCCH resource via the MAC-CE. For instance, the MAC-CE may indicate multiple indices for a set of pre-configured spatial relations; or the MAC-CE may indicate a bitmap (e.g., having bins that are set to 1) where each bin in the bitmap corresponds to a pre-configured spatial relation. Indicating the bitmap may be a desirable technique when a number of the pre-configured spatial relations is below a threshold number.

The UE 502 may receive a DCI in a PDCCH from the base station 504 that causes ACK/NACK feedback to be transmitted to the base station 504 via the PUCCH. In DCI format 1_0 and 1_1, a PDSCH transmission and a PUCCH resource may cause the UE 502 to transmit ACK/NACK bits that are decoded based on the PDSCH transmission. The UE 502 determines the spatial relations of the PUCCH based on the multiple spatial relation parameters of the PUCCH resource associated with the PDSCH transmission. The PUCCH resource is indicated by the DCI that triggers the PUCCH. Further, in DCI format 1_0 and 1_1, a “PUCCH resource indicator” field may indicate which PUCCH resource is used to transmit the PUCCH that feeds back the ACK/NACK for the PDSCH indicated by the DCI. If the associated PUCCH resource is configured or associated with a single spatial relation, the PUCCH is transmitted based on the single spatial relation. If the associated PUCCH resource is configured or associated with multiple spatial relations, the PUCCH is transmitted based on the multiple spatial relations. The PUCCH resource corresponds to a time-frequency resource that may be configured by the base station 504 based on a spatial relation indication to the UE 502.

The UE 502 may associate the multiple spatial relations to radio resource parts or transmission power parts of the PUCCH, as previously described with respect to FIGs. 6A-6C. The association may be based on a number of different techniques. For example, when frequency hopping is utilized for the PUCCH, a transmission parameter of each hop may be based on a different spatial relation in a natural order or another given order. In the natural order, index 1 is mapped to index 1, index 2 is mapped to index 2, etc. In another given order, index 1 may be mapped to index 3. Thus, a specified order identifies how the spatial relation index is mapped to the hop index. In another example, when the PUCCH occupies a plurality of frequency subbands, the transmission parameter of each frequency subband may be based on a different spatial relation according to the natural order or the another given order. In yet another example, when the UE 502 is equipped with multiple antenna panels, the UE 502 may transmit the PUCCH at a different antenna panel with a pre-split transmission power part based on a different spatial relation.

FIG. 7 illustrates a diagram 700 where spatial relations of a PUCCH are indicated by parameters of a PDCCH resource. More specifically, FIG. 7 corresponds to the third example where the multiple spatial relation parameters may be associated with the PUCCH based on a combination of aspects that relate to the first example and the second example. That is, the UE 502 may determine a PDCCH parameter value, such as a CORESET index value, of the PDDCH resource (e.g., similar to the first configuration) ; and further determine multiple spatial relations of the PUCCH based on multiple spatial relation parameters of the PUCCH resource (e.g., similar to the second configuration) .

The UE 502 may be configured to split the PUCCH into multiple parts, select a spatial relation from the determined multiple spatial relations based on the determined PDCCH resource parameter values, and transmit a part of the PUCCH included in the multiple parts based on the selected spatial relation. The PDCCH received in the PDCCH resource with the determined parameter value may initiate transmission of the part of the PUCCH. For example, a determined CORESET index value may be indicative of a spatial relation for the part of the PUCCH from the determined multiple spatial relations, such that ACK/NACK for the PDSCH may be transmitted by the part of the PUCCH. The PDSCH is in the PDCCH resource that includes the CORESET index value.

The PUCCH may be configured for transmission in a PUCCH resource based on one or more DCIs in one or more PDCCH resources. Further, the multiple spatial relations of the PUCCH are determined based on the parameters of the PUCCH resource that are indicated by the one or more DCI. A spatial relation of the multiple spatial relations may be determined based on the parameters of the PDCCH resources.

As shown in FIG. 7 there are two PDCCH resources (e.g. a first PDCCH resource 702 and a second PDCCH resource 704) that each include different parameters and a plurality of DCI. For instance, the first PDCCH resource 702 may have a parameter that includes a CORESET index value of 1, and the second PDCCH resource 704 may have a parameter that includes a CORESET index value of 2. Further, the first PDCCH resource 702 may include a first DCI 706 and a second DCI 708, and the second PDCCH resource 704 may include a third DCI 710 and a fourth DCI 712. Accordingly, the first DCI 706 and the second DCI 708 may be transmitted to the UE 502 in the first PDCCH resource 702 with information regarding a PDSCH transmission, whereas the third DCI 710 and the fourth DCI 712 may be transmitted to the UE 502 in the second PDCCH resource 704 with information regarding another PDSCH transmission. The plurality of DCI 706-712 may correspond to feedback for the PDSCH in a same PUCCH resource (e.g., a first PUCCH resource 714) . Additionally, other DCI may be included in PDCCH resources that correspond to feedback in other PUCCH resources, such as a second PUCCH resource 716, a third PUCCH resource 718, a fourth PUCCH resource 720, and a fifth PUCCH resource 722. In the flow chart 700, each of the DCI 706-712 may initiate a PUCCH, e.g., ACK/NACK for the PDSCH, that is to be transmitted in the first PUCCH resource 714.

The first PUCCH resource 714 may be configured with a plurality of spatial relations (e.g., a first spatial relation 724 and a second spatial relation 726) that correspond to transmission paths for the multiple parts of the PUCCH. The PUCCH transmitted in the first PUCCH resource 714 may be initiated based on the first PDCCH resource 702 and the second PDCCH resource 704. For example, the first DCI 706 and the second DCI 708 may initiate ACK/NACK feedback, via a first part of the PUCCH, for the PDSCHs scheduled by the first DCI 706 and the second DCI 708 in the first PDCCH resource 702. Further, because a parameter value of the CORESET index is 1 in the first PDCCH resource 702, the first part of the PUCCH may be transmitted based on the first spatial relation 724. Correspondingly, the third DCI 710 and the fourth DCI 712 may initiate ACK/NACK feedback, via a second part of the PUCCH, for the PDSCHs scheduled by the third DCI 710 and the fourth DCI 712 in the second PDCCH resource 704. Because a parameter value of the CORESET index is 2 in the second PDCCH resource 704, the second part of the PUCCH may be transmitted based on the second spatial relation 726.

Accordingly, the UE 502 may determine whether to transmit the PUCCH with a single spatial relation or multiple spatial relations based the parameters of a PDCCH resource and the parameters of a PUCCH. Transmissions based on multiple spatial relations may enhance PUCCH coverage by increasing diversity gain, increasing reliability of the signal, and reducing a probability that a signal is blocked or experiences interference.

FIG. 8 is a flowchart 800 of a method of wireless communication at a UE. The method may be performed by a UE (e.g., the 104, 350, 402, 502; an apparatus; a processing system, which may include the memory 360 and which may be the entire UE or a component of the UE, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359, any combination of which may comprise means for performing the functionalities illustrated in the method flowchart 800) . Optional aspects are illustrated using a dashed line. The method may help to improve uplink coverage, diversity gain, and reliability by enabling a UE to transmit uplink transmissions using multiple spatial relations.

At 802, the UE 502 may receive a configuration of a set of spatial relations from which an indication may indicate one or more spatial relations. For example, referring to FIG. 5, the UE 502 may receive the configuration from the base station 504 such that the indication from the base station 504 received at 506 may indicate the one or more spatial relations from the set of spatial relations. The configuration of the set of spatial relations may be received in RRC signaling and the indication may be received in a MAC-CE. Further, the indication may include at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations. The indication may also be received in RRC signaling and include a configuration of the uplink control channel resource with the multiple spatial relations.

At 804, the UE 502 receives the indication of the one or more spatial relations for an uplink control channel. For example, referring to FIG. 5, the UE 502 may receive at 506 an indication of the one or more spatial relations from the base station 504. The indication may be based on a downlink control channel parameter of one or more downlink control channels that triggers feedback in the uplink control channel. The downlink control channel parameter may include at least one of an index of a CCE, an index of a CORESET, an index of a CORESET pool, an index of a BWP, or an index of a cell, such that the one or more downlink control channels may be transmitted in a plurality of CCEs starting from the CCE. The CCE may be included in a radio resource of the CORESET, the CORESET may be included in radio resources of the CORESET pool, the CORESET pool may be included in a bandwidth of the BWP, and the BWP may be included in a cell bandwidth.

At 806, the UE 502 determines whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations. For example, referring to FIG. 5, the UE 502 determines at 510 whether to transmit using a single spatial relation or multiple spatial relations. The UE 502 may transmit the uplink control channel using the single spatial relation at 514 when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter 512. Alternatively, the UE 502 may transmit the uplink control channel using the multiple spatial relations at 520 when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters 516.

If the UE 502 determines at 806 to transmit the uplink control channel using the single spatial relation, the UE 502 may transmit the uplink control channel using the single spatial relation at 818 based on the determination at 806. For example, referring to FIG. 5, the UE 502 may transmit the uplink control channel at 514 to the base station 504 using the signal spatial relation based on the determination by the UE 502 at 510. If the UE 502 determines at 806 to transmit the uplink control channel using the multiple spatial relations, the UE may subsequently perform operation 808.

At 808, the UE 502 may select the multiple spatial relations from a set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels. For example, referring to FIG. 5, the UE 502 may select the multiple spatial relations at 518 from the set of configured spatial relations based on the different DL parameters 516. The UE 502 may receive a configuration of the set of configured spatial relations in at least one of RRC signaling, a MAC-CE, or DCI from the base station 504.

At 810, the UE 502 may use the multiple spatial relations to determine a transmission beam or a transmission power for the uplink control channel. For example, referring to FIG. 5, the UE 502 may use the multiple spatial relations selected at 518 to determine transmission beams or transmission powers of the uplink control channel transmitted at 520. As illustrated in FIG. 6A, the UE 502 may transmit the uplink control channel using a first spatial relation at a first time 610 and transmit the uplink control channel using a second spatial relation at a second time 612. As illustrated in FIG. 6B, the UE 502 may transmit the uplink control channel using a first spatial relation at a first frequency 620 and transmit the uplink control channel using a second spatial relation at a second frequency 622. The UE 502 may transmit the uplink control channel using the first spatial relation at the first frequency 620 and then hop to the second frequency at which the UE 502 transmits the uplink control channel using the second spatial relation. Thus, each hop may be based on a different spatial relation. The uplink control channel may occupy multiple frequency subbands and a transmission parameter of the uplink control channel in each subband may be based on a different spatial relation. As illustrated in FIG. 6C, the UE 502 may transmit the uplink control channel using a first spatial relation and a first portion 630 of a transmit power and transmit the uplink control channel using a second spatial relation and a second portion 632 of the transmit power at a same radio resource.

At 812, the UE 502 may receive a DCI that indicates an uplink control channel resource. For example, referring to FIG. 5, the UE 502 may receive the DCI with the indication received at 506 where the uplink control channel resource may be indicated in the DCI.

At 814, the UE 502 may determine whether to transmit the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource. For example, referring to FIG. 5, the UE 502 may determine to transmit the uplink control channel to the base station 504 using the single spatial relation at 514 based on a determined configuration of the uplink control channel resource configured at 508. Alternatively, the UE 502 may determine to transmit the uplink control channel to the base station 504 using the multiple spatial relations at 520 based on the determined configuration of the uplink control channel resource configured at 508.

At 816, the UE 502 transmits the uplink control channel using the multiple spatial relations based on the determination at 806 and, optionally, the determination at 814. For example, referring to FIG. 5, the UE 502 may transmit the uplink control channel at 520 to the base station 504 using the multiple spatial relations based on the determination to transmit the uplink control channel using the multiple spatial relations at 510 and, optionally, based on the determined configuration of the uplink control channel resource configured at 508. The UE 502 may include multiple antenna panels in which the UE 502 may transmit the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and transmit the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.

The indication received by the UE 502 may be based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and may also be based on a configuration of an uplink control channel resource with a corresponding spatial relation. The UE 502 may receive, in a first downlink control channel resource, a first DCI that triggers first feedback in the uplink control channel resource and receive, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource. The UE 502 may transmit, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource. The first spatial relation and the second spatial relation may be based on the configuration of the uplink control channel resource.

At 818, the UE 502 transmits the uplink control channel using the single spatial relation based on the determination at 806 or the determination at 814. For example, referring to FIG. 5, the UE 502 may transmit the uplink control channel at 514 to the base station 504 using the single spatial relation based on the determination to transmit the uplink control channel using the single spatial relation at 510 or based on the determined configuration of the uplink control channel resource configured at 508.

FIG. 9 is a flowchart 900 of a method of wireless communication at a base station. The method may be performed by a base station (e.g., the

base station

102, 180, 310, 404, 504; an apparatus; a processing system, which may include the memory 376 and which may be the entire base station or a component of the base station, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359, any combination of which may comprise means for performing the functionalities illustrated in the method flowchart 900) . Optional aspects are illustrated using a dashed line. The method may help to improve uplink coverage, diversity gain, and reliability by assisting a UE (e.g., the UE 502) to transmit uplink transmissions based on multiple spatial relations.

At 902, the base station 504 may configure a set of configured spatial relations, where multiple spatial relations are selected from the set of configured spatial relations based on different downlink control channel parameters of multiple downlink control channels. For example, referring to FIG. 5, the base station 504 may configure the set of configured spatial relations via the different DL parameters 516 transmitted to the UE 502 in the downlink channel. More specifically, the base station 504 may configure the set of configured spatial relations by at least one of RRC signaling, a MAC-CE, or DCI to the UE 502.

A transmission beam or a transmission power for the uplink control channel may be based on the multiple spatial relations. As illustrated in FIG. 6A, the base station 504 may receive the uplink control channel using a first spatial relation at a first time 610 and receive the uplink control channel using a second spatial relation at a second time 612. As illustrated in FIG. 6B, the base station 504 may receive the uplink control channel using a first spatial relation at a first frequency 620 and receive the uplink control channel using a second spatial relation at a second frequency 622. The base station 504 may receive the uplink control channel using a first spatial relation at the first frequency 620 and then hop to a second frequency at which the base station 504 may receive the uplink control channel using a second spatial relation. The uplink control channel may occupy multiple frequency subbands and a transmission parameter of the uplink control channel in each subband may be based on a different spatial relation. As illustrated in FIG. 6C, the base station 504 may receive the uplink control channel using a first spatial relation and a first portion 630 of a transmit power and receive the uplink control channel using a second spatial relation and a second portion 632 of the transmit power at a same radio resource.

As illustrated at 904, the base station 504 may transmit the configuration of the set of spatial relations. The indication may indicate one or more spatial relations from the set of spatial relations. For example, referring to FIG. 5, the base station 504 may transmit the configuration to the UE 502 such that the indication to the UE 502 received at 506 may indicate the one or more spatial relations from the set of spatial relations. The configuration of the set of spatial relations may be transmitted in RRC signaling and the indication may be transmitted in a MAC-CE. Further, the indication may include at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations. The indication may also be transmitted in RRC signaling and include a configuration of the uplink control channel resource with the multiple spatial relations. The base station 504 may receive the uplink control channel using the single spatial relation at 514 when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter 512. Alternatively, the base station 504 may receive the uplink control channel using the multiple spatial relations at 520 when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters 516.

At 906, the base station 504 transmits, to the UE 502, an indication of one or more spatial relations for an uplink control channel. For example, referring to FIG. 5, the base station 504 may transmit at 506 an indication of the one or more spatial relations to the UE 502. The indication may be based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel. The downlink control channel parameter includes at least one of an index of a CCE, an index of a CORESET, an index of a CORESET pool, an index of a BWP, or an index of a cell, such that the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE. The CCE may be included in a radio resource of the CORESET, the CORESET may be included in radio resources of the CORESET pool, the CORESET pool may be included in a bandwidth of the BWP, and the BWP may be included in a cell bandwidth.

At 908, the base station 504 may transmit a DCI that indicates an uplink control channel resource. For example, referring to FIG. 5, the base station 504 may transmit the DCI with the indication transmitted at 506 where the uplink control channel resource may be indicated in the DCI.

At 910, the base station 504 may receive the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource. For example, referring to FIG. 5, the base station 504 may receive the uplink control channel from the UE 502 using the single spatial relation at 514 based on a configuration of the uplink control channel resource. Alternatively, the base station 504 may receive the uplink control channel from the UE 502 using the multiple spatial relations at 520 based on the configuration of the uplink control channel resource. The UE 502 may include multiple antenna panels in which the base station 504 may receive the uplink control channel from a first antenna panel using a first spatial relation and a first part 630 of a transmission power and receive the uplink control channel from a second antenna panel using a second spatial relation and a second part 632 of the transmission power at a same radio resource.

The indication transmitted from the base station 504 may be based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and may also be based on a configuration of an uplink control channel resource with a corresponding spatial relation. The base station 504 may transmit, in a first downlink control channel resource, a first DCI that triggers first feedback in the uplink control channel resource and transmit, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource. The base station 504 may receive, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource. The first spatial relation and the second spatial relation may be based on the configuration of the uplink control channel resource.

At 912, the base station 504 receives the uplink control channel from the UE 502 using a single spatial relation or multiple spatial relations based on the indication. For example, referring to FIG. 5, the base station 504 may receive, based on the indication transmitted at 506, the uplink control channel at 514 using the single spatial relation or the uplink control channel at 520 using the multiple spatial relations.

Accordingly, the base station 504 may transmit to the UE 502 an indication of one or more spatial relations for a PUCCH. Spatial relation parameters of the PUCCH may be associated with either parameters of one or more PDCCH resources, configured multiple spatial relation parameters of a PUCCH resource, or a combination of both. Based on the associated parameters, the UE 502 determines whether to transmit the PUCCH using a single spatial relation or multiple spatial relations. The base station 504 receives the PUCCH from the UE 502 using the single spatial relation or the multiple spatial relations and in accordance with the indication transmitted by the base station 504 and the determination by the UE 502.

Further disclosure is included in the Appendix.

It is understood that the specific order or hierarchy of blocks in the processes /flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes /flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” The word “exemplary” is used herein to mean “serving as an example, instance, or illustration. ” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ”

Claims

A method of wireless communication at a user equipment (UE) , comprising:

receiving an indication of one or more spatial relations for an uplink control channel;

determining whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations; and

transmitting the uplink control channel using the single spatial relation or the multiple spatial relations based on the determination.
The method of claim 1, wherein the indication is based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel.
The method of claim 2, wherein the downlink control channel parameter includes at least one of an index of a control channel element (CCE) , an index of a control resource set (CORESET) , an index of a CORESET pool, an index of a bandwidth part (BWP) , or an index of a cell, wherein the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE, the CCEs being comprised in a radio resource of the CORESET, the CORESET being comprised in radio resources of the CORESET pool, the CORESET pool being comprised in a bandwidth of the BWP, and the BWP being comprised in a cell bandwidth.
The method of claim 2, wherein the UE transmits the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter, and wherein the UE transmits the uplink control channel using the multiple spatial relations when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters.
The method of claim 4, further comprising:

selecting the multiple spatial relations from a set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels.
The method of claim 5, further comprising:

receiving a configuration of the set of configured spatial relations in at least one of radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) , or downlink control information (DCI) .
The method of claim 1, further comprising:

using the multiple spatial relations to determine transmission beams or transmission powers for the uplink control channel.
The method of claim 1, wherein the UE transmits the uplink control channel using a first spatial relation at a first time and transmits the uplink control channel using a second spatial relation at a second time.
The method of claim 1, wherein the UE transmits the uplink control channel using a first spatial relation at a first frequency and transmits the uplink control channel using a second spatial relation at a second frequency.
The method of claim 1, wherein the UE transmits the uplink control channel using a first spatial relation and a first portion of a transmit power and transmits the uplink control channel using a second spatial relation and a second portion of the transmit power at a same radio resource.
The method of claim 1, wherein the indication comprises a configuration of an uplink control channel resource with the multiple spatial relations.
The method of claim 11, wherein the indication is received in radio resource control (RRC) signaling.
The method of claim 1, further comprising:

receiving a configuration of a set of spatial relations, wherein the indication indicates the one or more spatial relations from the set of spatial relations.
The method of claim 13, wherein the configuration of the set of spatial relations is received in radio resource control (RRC) signaling and the indication is received in a medium access control-control element (MAC-CE) .
The method of claim 13, wherein the indication comprises at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations.
The method of claim 1, further comprising:

receiving a downlink control information (DCI) , wherein an uplink control channel resource is indicated in the DCI; and

determining whether to transmit the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource.
The method of claim 1, wherein the UE transmits the uplink control channel using a first spatial relation at a first frequency and then hops to a second frequency at which the UE transmits the uplink control channel using a second spatial relation.
The method of claim 1, wherein the uplink control channel occupies multiple frequency subbands, and wherein a transmission parameter of the uplink control channel in each subband is based on a different spatial relation.
The method of claim 1, wherein the UE comprises multiple antenna panels, and wherein the UE transmits the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and transmits the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.
The method of claim 1, wherein the indication is based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and is based on a configuration of an uplink control channel resource with a corresponding spatial relation.
The method of claim 20, wherein the UE receives, in a first downlink control channel resource, a first downlink control information (DCI) that triggers first feedback in the uplink control channel resource and the UE receives, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource, and

wherein the UE transmits, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource, and wherein the first spatial relation and the second spatial relation are based on the configuration of the uplink control channel resource.
A method of wireless communication at a base station, comprising:

transmitting, to a user equipment (UE) , an indication of one or more spatial relations for an uplink control channel; and

receiving the uplink control channel from the UE using a single spatial relation or multiple spatial relations based on the indication.
The method of claim 22, wherein the indication is based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel.
The method of claim 23, wherein the downlink control channel parameter includes at least one of an index of a control channel element (CCE) , an index of a control resource set (CORESET) , an index of a CORESET pool, an index of a bandwidth part (BWP) , or an index of a cell, wherein the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE, the CCEs being comprised in a radio resource of the CORESET, the CORESET being comprised in radio resources of the CORESET pool, the CORESET pool being comprised in a bandwidth of the BWP, and the BWP being comprised in a cell bandwidth.
The method of claim 23, wherein the base station receives the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter, and wherein the base station receives the uplink control channel using the multiple spatial relations when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters.
The method of claim 25, further comprising:

configuring a set of configured spatial relations, wherein the multiple spatial relations are selected from the set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels.
The method of claim 26, wherein the set of configured spatial relations is configured in at least one of radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) , or downlink control information (DCI) .
The method of claim 22, wherein transmission beams or transmission powers for the uplink control channel are based on the multiple spatial relations.
The method of claim 22, wherein the base station receives the uplink control channel using a first spatial relation at a first time and receives the uplink control channel using a second spatial relation at a second time.
The method of claim 22, wherein the base station receives the uplink control channel using a first spatial relation at a first frequency and receives the uplink control channel using a second spatial relation at a second frequency.
The method of claim 22, wherein the base station receives the uplink control channel using a first spatial relation and a first portion of a transmit power and receives the uplink control channel using a second spatial relation and a second portion of the transmit power at a same radio resource.
The method of claim 22, wherein the indication comprises a configuration of an uplink control channel resource with the multiple spatial relations.
The method of claim 32, wherein the indication is transmitted in radio resource control (RRC) signaling.
The method of claim 22, further comprising:

transmitting a configuration of a set of spatial relations, wherein the indication indicates the one or more spatial relations from the set of spatial relations.
The method of claim 34, wherein the configuration of the set of spatial relations is transmitted in radio resource control (RRC) signaling and the indication is transmitted in a medium access control-control element (MAC-CE) .
The method of claim 34, wherein the indication comprises at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations.
The method of claim 22, further comprising:

transmitting a downlink control information (DCI) , wherein an uplink control channel resource is indicated in the DCI; and

receiving the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource.
The method of claim 22, wherein the base station receives the uplink control channel using a first spatial relation at a first frequency and then hops to a second frequency at which the base station receives the uplink control channel using a second spatial relation.
The method of claim 22, wherein the uplink control channel occupies multiple frequency subbands, and wherein a transmission parameter of the uplink control channel in each subband is based on a different spatial relation.
The method of claim 22, wherein the UE comprises multiple antenna panels, and wherein the base station receives the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and receives the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.
The method of claim 22, wherein the indication is based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and is based on a configuration of an uplink control channel resource with a corresponding spatial relation.
The method of claim 41, wherein the base station transmits, in a first downlink control channel resource, a first downlink control information (DCI) that triggers first feedback in the uplink control channel resource and the base station transmits, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource, and

wherein the base station receives, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource, and wherein the first spatial relation and the second spatial relation are based on the configuration of the uplink control channel resource.
An apparatus for wireless communication, the apparatus being a wireless device at a user equipment (UE) , comprising:

means for receiving an indication of one or more spatial relations for an uplink control channel;

means for determining whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations; and

means for transmitting the uplink control channel using the single spatial relation or the multiple spatial relations based on the determination.
The apparatus of claim 43, wherein the indication is based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel.
The apparatus of claim 44, wherein the downlink control channel parameter includes at least one of an index of a control channel element (CCE) , an index of a control resource set (CORESET) , an index of a CORESET pool, an index of a bandwidth part (BWP) , or an index of a cell, wherein the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE, the CCEs being comprised in a radio resource of the CORESET, the CORESET being comprised in radio resources of the CORESET pool, the CORESET pool being comprised in a bandwidth of the BWP, and the BWP being comprised in a cell bandwidth.
The apparatus of claim 44, wherein the UE transmits the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter, and wherein the UE transmits the uplink control channel using the multiple spatial relations when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters.
The apparatus of claim 46, further comprising:

means for selecting the multiple spatial relations from a set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels.
The apparatus of claim 47, further comprising:

means for receiving a configuration of the set of configured spatial relations in at least one of radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) , or downlink control information (DCI) .
The apparatus of claim 43, further comprising:

means for using the multiple spatial relations to determine transmission beams or transmission powers for the uplink control channel.
The apparatus of claim 43, wherein the UE transmits the uplink control channel using a first spatial relation at a first time and transmits the uplink control channel using a second spatial relation at a second time.
The apparatus of claim 43, wherein the UE transmits the uplink control channel using a first spatial relation at a first frequency and transmits the uplink control channel using a second spatial relation at a second frequency.
The apparatus of claim 43, wherein the UE transmits the uplink control channel using a first spatial relation and a first portion of a transmit power and transmits the uplink control channel using a second spatial relation and a second portion of the transmit power at a same radio resource.
The apparatus of claim 43, wherein the indication comprises a configuration of an uplink control channel resource with the multiple spatial relations.
The apparatus of claim 53, wherein the indication is received in radio resource control (RRC) signaling.
The apparatus of claim 43, further comprising:

means for receiving a configuration of a set of spatial relations, wherein the indication indicates the one or more spatial relations from the set of spatial relations.
The apparatus of claim 55, wherein the configuration of the set of spatial relations is received in radio resource control (RRC) signaling and the indication is received in a medium access control-control element (MAC-CE) .
The apparatus of claim 55, wherein the indication comprises at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations.
The apparatus of claim 43, further comprising:

means for receiving a downlink control information (DCI) , wherein an uplink control channel resource is indicated in the DCI; and

means for determining whether to transmit the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource.
The apparatus of claim 43, wherein the UE transmits the uplink control channel using a first spatial relation at a first frequency and then hops to a second frequency at which the UE transmits the uplink control channel using a second spatial relation.
The apparatus of claim 43, wherein the uplink control channel occupies multiple frequency subbands, and wherein a transmission parameter of the uplink control channel in each subband is based on a different spatial relation.
The apparatus of claim 43, wherein the UE comprises multiple antenna panels, and wherein the UE transmits the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and transmits the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.
The apparatus of claim 43, wherein the indication is based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and is based on a configuration of an uplink control channel resource with a corresponding spatial relation.
The apparatus of claim 62, wherein the UE receives, in a first downlink control channel resource, a first downlink control information (DCI) that triggers first feedback in the uplink control channel resource and the UE receives, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource, and

wherein the UE transmits, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource, and wherein the first spatial relation and the second spatial relation are based on the configuration of the uplink control channel resource.
An apparatus for wireless communication, the apparatus being a wireless device at a base station, comprising:

means for transmitting, to a user equipment (UE) , an indication of one or more spatial relations for an uplink control channel; and

means for receiving the uplink control channel from the UE using a single spatial relation or multiple spatial relations based on the indication.
The apparatus of claim 64, wherein the indication is based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel.
The apparatus of claim 65, wherein the downlink control channel parameter includes at least one of an index of a control channel element (CCE) , an index of a control resource set (CORESET) , an index of a CORESET pool, an index of a bandwidth part (BWP) , or an index of a cell, wherein the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE, the CCEs being comprised in a radio resource of the CORESET, the CORESET being comprised in radio resources of the CORESET pool, the CORESET pool being comprised in a bandwidth of the BWP, and the BWP being comprised in a cell bandwidth.
The apparatus of claim 65, wherein the base station receives the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter, and wherein the base station receives the uplink control channel using the multiple spatial relations when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters.
The apparatus of claim 67, further comprising:

means for configuring a set of configured spatial relations, wherein the multiple spatial relations are selected from the set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels.
The apparatus of claim 68, wherein the set of configured spatial relations is configured in at least one of radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) , or downlink control information (DCI) .
The apparatus of claim 64, wherein transmission beams or transmission powers for the uplink control channel are based on the multiple spatial relations.
The apparatus of claim 64, wherein the base station receives the uplink control channel using a first spatial relation at a first time and receives the uplink control channel using a second spatial relation at a second time.
The apparatus of claim 64, wherein the base station receives the uplink control channel using a first spatial relation at a first frequency and receives the uplink control channel using a second spatial relation at a second frequency.
The apparatus of claim 64, wherein the base station receives the uplink control channel using a first spatial relation and a first portion of a transmit power and receives the uplink control channel using a second spatial relation and a second portion of the transmit power at a same radio resource.
The apparatus of claim 64, wherein the indication comprises a configuration of an uplink control channel resource with the multiple spatial relations.
The apparatus of claim 74, wherein the indication is transmitted in radio resource control (RRC) signaling.
The apparatus of claim 64, further comprising:

means for transmitting a configuration of a set of spatial relations, wherein the indication indicates the one or more spatial relations from the set of spatial relations.
The apparatus of claim 76, wherein the configuration of the set of spatial relations is transmitted in radio resource control (RRC) signaling and the indication is transmitted in a medium access control-control element (MAC-CE) .
The apparatus of claim 76, wherein the indication comprises at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations.
The apparatus of claim 64, further comprising:

means for transmitting a downlink control information (DCI) , wherein an uplink control channel resource is indicated in the DCI; and

means for receiving the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource.
The apparatus of claim 64, wherein the base station receives the uplink control channel using a first spatial relation at a first frequency and then hops to a second frequency at which the base station receives the uplink control channel using a second spatial relation.
The apparatus of claim 64, wherein the uplink control channel occupies multiple frequency subbands, and wherein a transmission parameter of the uplink control channel in each subband is based on a different spatial relation.
The apparatus of claim 64, wherein the UE comprises multiple antenna panels, and wherein the base station receives the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and receives the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.
The apparatus of claim 64, wherein the indication is based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and is based on a configuration of an uplink control channel resource with a corresponding spatial relation.
The apparatus of claim 83, wherein the base station transmits, in a first downlink control channel resource, a first downlink control information (DCI) that triggers first feedback in the uplink control channel resource and the base station transmits, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource, and

wherein the base station receives, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource, and wherein the first spatial relation and the second spatial relation are based on the configuration of the uplink control channel resource.
An apparatus for wireless communication, the apparatus being a wireless device at a user equipment (UE) , comprising:

a memory; and

at least one processor coupled to the memory configured to:

receive an indication of one or more spatial relations for an uplink control channel;

determine whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations; and

transmit the uplink control channel using the single spatial relation or the multiple spatial relations based on the determination.
The apparatus of claim 85, wherein the indication is based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel.
The apparatus of claim 86, wherein the downlink control channel parameter includes at least one of an index of a control channel element (CCE) , an index of a control resource set (CORESET) , an index of a CORESET pool, an index of a bandwidth part (BWP) , or an index of a cell, wherein the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE, the CCEs being comprised in a radio resource of the CORESET, the CORESET being comprised in radio resources of the CORESET pool, the CORESET pool being comprised in a bandwidth of the BWP, and the BWP being comprised in a cell bandwidth.
The apparatus of claim 86, wherein the UE transmits the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter, and wherein the UE transmits the uplink control channel using the multiple spatial relations when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters.
The apparatus of claim 88, wherein the at least one processor is further configured to:

select the multiple spatial relations from a set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels.
The apparatus of claim 89, wherein the at least one processor is further configured to:

receive a configuration of the set of configured spatial relations in at least one of radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) , or downlink control information (DCI) .
The apparatus of claim 85, wherein the at least one processor is further configured to:

use the multiple spatial relations to determine transmission beams or transmission powers for the uplink control channel.
The apparatus of claim 85, wherein the UE transmits the uplink control channel using a first spatial relation at a first time and transmits the uplink control channel using a second spatial relation at a second time.
The apparatus of claim 85, wherein the UE transmits the uplink control channel using a first spatial relation at a first frequency and transmits the uplink control channel using a second spatial relation at a second frequency.
The apparatus of claim 85, wherein the UE transmits the uplink control channel using a first spatial relation and a first portion of a transmit power and transmits the uplink control channel using a second spatial relation and a second portion of the transmit power at a same radio resource.
The apparatus of claim 85, wherein the indication comprises a configuration of an uplink control channel resource with the multiple spatial relations.
The apparatus of claim 95, wherein the indication is received in radio resource control (RRC) signaling.
The apparatus of claim 85, wherein the at least one processor is further configured to:

receive a configuration of a set of spatial relations, wherein the indication indicates the one or more spatial relations from the set of spatial relations.
The apparatus of claim 97, wherein the configuration of the set of spatial relations is received in radio resource control (RRC) signaling and the indication is received in a medium access control-control element (MAC-CE) .
The apparatus of claim 97, wherein the indication comprises at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations.
The apparatus of claim 85, wherein the at least one processor is further configured to:

receive a downlink control information (DCI) , wherein an uplink control channel resource is indicated in the DCI; and

determine whether to transmit the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource.
The apparatus of claim 85, wherein the UE transmits the uplink control channel using a first spatial relation at a first frequency and then hops to a second frequency at which the UE transmits the uplink control channel using a second spatial relation.
The apparatus of claim 85, wherein the uplink control channel occupies multiple frequency subbands, and wherein a transmission parameter of the uplink control channel in each subband is based on a different spatial relation.
The apparatus of claim 85, wherein the UE comprises multiple antenna panels, and wherein the UE transmits the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and transmits the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.
The apparatus of claim 85, wherein the indication is based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and is based on a configuration of an uplink control channel resource with a corresponding spatial relation.
The apparatus of claim 104, wherein the UE receives, in a first downlink control channel resource, a first downlink control information (DCI) that triggers first feedback in the uplink control channel resource and the UE receives, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource, and

wherein the UE transmits, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource, and wherein the first spatial relation and the second spatial relation are based on the configuration of the uplink control channel resource.
An apparatus for wireless communication, the apparatus being a wireless device at a base station, comprising:

a memory; and

at least one processor coupled to the memory configured to:

transmit, to a user equipment (UE) , an indication of one or more spatial relations for an uplink control channel; and

receive the uplink control channel from the UE using a single spatial relation or multiple spatial relations based on the indication.
The apparatus of claim 106, wherein the indication is based on a downlink control channel parameter of one or more downlink control channel that triggers feedback in the uplink control channel.
The apparatus of claim 107, wherein the downlink control channel parameter includes at least one of an index of a control channel element (CCE) , an index of a control resource set (CORESET) , an index of a CORESET pool, an index of a bandwidth part (BWP) , or an index of a cell, wherein the one or more downlink control channel is transmitted in a plurality of CCEs starting from the CCE, the CCEs being comprised in a radio resource of the CORESET, the CORESET being comprised in radio resources of the CORESET pool, the CORESET pool being comprised in a bandwidth of the BWP, and the BWP being comprised in a cell bandwidth.
The apparatus of claim 107, wherein the base station receives the uplink control channel using the single spatial relation when multiple downlink control channels that trigger the feedback have a common downlink control channel parameter, and wherein the base station receives the uplink control channel using the multiple spatial relations when the multiple downlink control channels that trigger the feedback have different downlink control channel parameters.
The apparatus of claim 109, wherein the at least one processor is further configured to:

configure a set of configured spatial relations, wherein the multiple spatial relations are selected from the set of configured spatial relations based on the different downlink control channel parameters of the multiple downlink control channels.
The apparatus of claim 110, wherein the set of configured spatial relations is configured in at least one of radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) , or downlink control information (DCI) .
The apparatus of claim 106, wherein transmission beams or transmission powers for the uplink control channel are based on the multiple spatial relations.
The apparatus of claim 106, wherein the base station receives the uplink control channel using a first spatial relation at a first time and receives the uplink control channel using a second spatial relation at a second time.
The apparatus of claim 106, wherein the base station receives the uplink control channel using a first spatial relation at a first frequency and receives the uplink control channel using a second spatial relation at a second frequency.
The apparatus of claim 106, wherein the base station receives the uplink control channel using a first spatial relation and a first portion of a transmit power and receives the uplink control channel using a second spatial relation and a second portion of the transmit power at a same radio resource.
The apparatus of claim 106, wherein the indication comprises a configuration of an uplink control channel resource with the multiple spatial relations.
The apparatus of claim 116, wherein the indication is transmitted in radio resource control (RRC) signaling.
The apparatus of claim 106, wherein the at least one processor is further configured to:

transmit a configuration of a set of spatial relations, wherein the indication indicates the one or more spatial relations from the set of spatial relations.
The apparatus of claim 118, wherein the configuration of the set of spatial relations is transmitted in radio resource control (RRC) signaling and the indication is transmitted in a medium access control-control element (MAC-CE) .
The apparatus of claim 118, wherein the indication comprises at least one of a bitmap indicating the one or more spatial relations from the set of spatial relations or an index for each of the one or more spatial relations.
The apparatus of claim 106, wherein the at least one processor is further configured to:

transmit a downlink control information (DCI) , wherein an uplink control channel resource is indicated in the DCI; and

receive the uplink control channel using the single spatial relation or the multiple spatial relations based on a configuration of the uplink control channel resource.
The apparatus of claim 106, wherein the base station receives the uplink control channel using a first spatial relation at a first frequency and then hops to a second frequency at which the base station receives the uplink control channel using a second spatial relation.
The apparatus of claim 106, wherein the uplink control channel occupies multiple frequency subbands, and wherein a transmission parameter of the uplink control channel in each subband is based on a different spatial relation.
The apparatus of claim 106, wherein the UE comprises multiple antenna panels, and wherein the base station receives the uplink control channel from a first antenna panel using a first spatial relation and a first part of a transmission power and receives the uplink control channel from a second antenna panel using a second spatial relation and a second part of the transmission power at a same radio resource.
The apparatus of claim 106, wherein the indication is based on a downlink control channel parameter of one or more downlink control channels that trigger feedback in the uplink control channel and is based on a configuration of an uplink control channel resource with a corresponding spatial relation.
The apparatus of claim 125, wherein the base station transmits, in a first downlink control channel resource, a first downlink control information (DCI) that triggers first feedback in the uplink control channel resource and the base station transmits, in a second downlink control channel resource, a second DCI that triggers second feedback in a same uplink control channel resource, and

wherein the base station receives, in the uplink control channel resource, the first feedback using a first spatial relation based on the downlink control channel parameter of the first downlink control channel resource and the second feedback using a second spatial relation based on the downlink control channel parameter of the second downlink control channel resource, and wherein the first spatial relation and the second spatial relation are based on the configuration of the uplink control channel resource.
A computer-readable medium storing computer executable code, the code when executed by a processor of a wireless device at a user equipment (UE) , causes the processor to:

receive an indication of one or more spatial relations for an uplink control channel;

determine whether to transmit the uplink control channel using a single spatial relation or multiple spatial relations; and

transmit the uplink control channel using the single spatial relation or the multiple spatial relations based on the determination.
A computer-readable medium storing computer executable code, the code when executed by a processor of a wireless device at a base station, causes the processor to:

transmit, to a user equipment (UE) , an indication of one or more spatial relations for an uplink control channel; and

receive the uplink control channel from the UE using a single spatial relation or multiple spatial relations based on the indication.