Indications for updating uplink and downlink beams

Abstract

Certain aspects of the present disclosure relate to methods and apparatuses for indicating updates to be applied to uplink and downlink beams. A method, which can be performed by a user equipment (UE), generally includes receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and processing at least one of an uplink transmission or a downlink transmission in accordance with the update. A method, which can be performed by a base station (BS), generally includes transmitting, to a UE, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and processing at least one of an uplink transmission or a downlink transmission in accordance with the update.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to U.S. Application No. 17 / 119,710 filed December 11, 2020, which claims benefit of and priority to U.S. Patent Application No. 62 / 948,772 filed December 16, 2019, both of which are assigned to the assignee hereof and hereby expressly incorporated by reference herein in their entireties as if fully set forth below and for all applicable purposes.

[0003] BACKGROUND

[0004] BACKGROUND

[0005] The present disclosure relates generally to communication systems, and more particularly to methods and apparatus for indicating updates to be applied to uplink and downlink beams.

[0006] TECHNICAL PROBLEM

[0007] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple-access technologies include Long Term Evolution (LTE) systems, 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.

[0008] In some examples, a wireless multiple access communication system may include several base stations, each base station simultaneously supporting communication for multiple communication devices (also referred to as user equipment (UE)). In an LTE or LTE-Advanced (LTE-A) network, a set of one or more base stations may define an evolved Node B (eNB). In other examples (e.g., in a next generation or 5G network), a wireless multiple access communication system may include several distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmission reception points (TRPs), etc.) in communication with several central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), wherein the set of one or more distributed units in communication with the central unit may define an access node (e.g., new radio base station (NR BS), new radio Node B (NR NB), network node, 5GNB, eNB, next generation Node B (gNB), etc.). A base station or DU may communicate with a set of UEs on downlink channels (eg, for transmissions from the base station or to the UE) and uplink channels (eg, for transmissions from the UE to the base station or distributed unit).

[0009] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example of an emerging telecommunication standard is New Radio (NR), for example, 5G radio access. NR is an enhancement to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). It is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with cyclic prefix (CP) on downlink (DL) and uplink (UL), and supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0010] However, as demand for mobile broadband access continues to grow, there is a desire for further improvements in NR technology. Preferably, these improvements should also be applicable to other multiple access technologies and the telecommunication standards that employ them.

[0011] Brief Overview

[0012] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the disclosure as expressed in the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description," one will understand how the features of the present disclosure provide advantages, including improved communication between access points and stations in a wireless network.

[0013] Certain aspects provide a method for wireless communications by a user equipment. The method generally includes receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and processing at least one of the uplink or downlink transmissions in accordance with the update.

[0014] Certain aspects provide a method for wireless communications by a network entity. The method generally includes transmitting, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and processing at least one of the uplink or downlink transmissions in accordance with the update.

[0015] Certain aspects provide an apparatus for wireless communications. The apparatus generally includes a memory and one or more processors coupled to the memory, the one or more processors and the memory configured to receive, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and process at least one of the uplink or downlink transmissions in accordance with the update.

[0016] Certain aspects provide an apparatus for wireless communications. The apparatus generally includes a memory and one or more processors coupled to the memory, the one or more processors and the memory configured to receive, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and process at least one of the uplink or downlink transmissions in accordance with the update.

[0017] Certain aspects provide a computer-readable medium having stored thereon computer executable code for wireless communications. The computer-readable medium generally includes code for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and code for processing at least one of the uplink or downlink transmissions in accordance with the update.

[0018] Certain aspects provide a computer-readable medium having stored thereon computer executable code for wireless communications. The computer-readable medium generally includes code for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and code for processing at least one of the uplink or downlink transmissions in accordance with the update.

[0019] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes means for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and means for processing at least one of uplink or downlink transmissions in accordance with the update.

[0020] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes means for transmitting, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and means for processing at least one of uplink or downlink transmissions in accordance with the update.

[0021] 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 can be employed. This description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF DRAWINGS

[0023] So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, can be had by reference to various aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description can admit to other equally effective aspects.

[0024] FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in which aspects of the present disclosure can be implemented.

[0025] FIG. 2 is a block diagram illustrating an example logical architecture of a distributed radio access network (RAN), in accordance with certain aspects of the present disclosure.

[0026] FIG. 3 is a diagram illustrating an example physical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.

[0027] FIG. 4 is a block diagram conceptually illustrating a design of an example BS and user equipment (UE), in accordance with certain aspects of the present disclosure.

[0028] FIG. 5 is a diagram showing examples for implementing a communication protocol stack, in accordance with certain aspects of the present disclosure.

[0029] FIG. 6Examples of a frame format for new radio (NR) systems according to certain aspects of the present disclosure are illustrated.

[0030] FIG. 7 Examples of transmission configuration indicator (TCI) state information for signaling quasi co-location (QCL) information are illustrated.

[0031] FIG. 8 An example QCL relationship between a source reference signal and a target reference signal is graphically illustrated.

[0032] FIG. 9 Example medium access control (MAC) control elements (CEs) for activating or deactivating TCI states for UE-specific physical channels are illustrated.

[0033] FIG. 10 Example MAC CEs for activating or deactivating TCI states for physical downlink control channels (PDCCHs) are illustrated.

[0034] FIG. 11 Example operations for wireless communication by a user equipment (UE) according to aspects of the present disclosure are illustrated.

[0035] FIG. 12 Example operations for wireless communication by a network entity according to aspects of the present disclosure are illustrated.

[0036] FIG. 13 Example common beam operations for uplink and downlink beams are illustrated.

[0037] FIG. 14 Communication devices that can include various components configured to perform operations for the techniques disclosed herein are illustrated according to aspects of the present disclosure.

[0038] FIG. 15 Communication devices that can include various components configured to perform operations for the techniques disclosed herein are illustrated according to aspects of the present disclosure.

[0039] To facilitate an understanding of this description, like reference characters are used to identify like elements throughout the several figures. It is contemplated that elements disclosed in one aspect can be beneficially utilized on other aspects without specific recitation.

[0040] DETAILED DESCRIPTION

[0041] Aspects of the present disclosure provide mechanisms for indicating updates to be applied (e.g., jointly) to uplink and downlink beams. The mechanisms can be applied for new radio (NR) (i.e., new radio access technology or 5G technology).

[0042] NR can support various wireless communication services, such as Enhanced Mobile Broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz), Millimeter Wave (mmW) targeting high carrier frequency (e.g., 60 GHz), massive Machine Type Communications (MTC) targeting non-backward compatible MTC techniques (e.g., with carrier

[0043] The following description provides examples, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes can be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples can omit, substitute, or add various procedures or components as appropriate. For instance, the methods described can be performed in an order different than described, and various steps can be added, omitted, or combined. Also, features described with respect to some examples can be combined in some other examples. For example, an apparatus can be implemented or a method can be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of a claim. 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.

[0044] The techniques described herein can be used for various wireless communication networks such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms“network” and“system” are often used interchangeably. A CDMA network can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband-CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). NR is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named“3rd Generation Partnership Project” (3GPP). cdma2000 and UMB are described in documents from an organization named“3rd Generation Partnership Project 2” (3GPP2).“LTE” refers to LTE, LTE-Advanced (LTE-A), LTE in unlicensed spectrum (blank space LTE), etc. The techniques described herein can be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while aspects can be described herein using terminology commonly associated with 3G and / or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.

[0045] Example wireless communications system

[0046] FIG. 1 An example wireless network 100, such as a New Radio (NR) or 5G network, in which aspects of the present disclosure can be performed is illustrated, by way of example, in FIG. 1. For instance, the network 100 can include one or more user equipment (UE) 120 configured to perform operations 1100 of FIG. 11. Similarly, the network 100 can include one or more base stations 110 configured to perform operations 1200 of FIG. 12. FIG. 11 FIG. 12

[0047] As FIG. 1 ​​As illustrated, the wireless network 100 can include a number of base stations (BSs) 110 and other network entities. A BS can be a station that communicates with UEs. Each BS 110 can provide communication coverage for a particular geographic area. In 3GPP, the term“cell” can refer to a coverage area of a Node B and / or a Node B subsystem serving this coverage area, depending on the context in which the term is used. In NR systems, the term“cell” and eNB, Node B, 5G NB, AP, NR BS, NR BS, gNB, or TRP can be interchangeable. In some examples, a cell can not necessarily be stationary, and the geographic area of the cell can move to a different location depending on the location of a mobile base station. In some examples, base stations can be interconnected to one another and / or to one or more other base stations or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, or the like using any suitable transport network.

[0048] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a particular radio access technology (RAT) and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, an air interface, etc. A frequency can also be referred to as a carrier, a frequency channel, etc. Each frequency channel can support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0049] A BS can be referred to as a NR BS, a 5G BS, a Node B, a gNB, a gNode B (gNB), an access point, an access node, a home base station, a home Node B, or some other similar terminology. In some examples, a BS can include a single antenna. In some examples, a BS can be equipped with multiple antennas. A BS can provide communication coverage for a particular area, e.g., a cell or a cell sector, through a number of base station antennas and / or antenna elements along with the appropriate associated hardware, such as a network controller. Base stations 110 can be associated with a particular cell and can be referred to as a cell such as a macro cell, a small cell, a femtocell, a pico cell, etc. FIG. 1 In the example shown in FIG. 1, the BSs 110a, 110b and 110c can be macro BSs for the macro cells 102a, 102b and 102c, respectively. The BS 110x can be a pico BS for a pico cell 102x. The BSs 110y and 110z can be femto BSs for the femto cells 102y and 102z, respectively. A BS can support one or multiple (e.g., three) cells.

[0050] Wireless network 100 can also include relay stations. A relay station is an entity that can receive a transmission of data and / or other information from an upstream station (e.g., a BS or a UE) and send a transmission of the data and / or other information to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. FIG. 1 In the example shown in FIG. 1, a relay station 1 lOr can communicate with macro BS 110a and a UE 120r in order to facilitate communications between BS 110a and UE 120r. A relay station can also be referred to as a relay BS, a relay, etc.

[0051] Wireless network 100 can be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relays, etc. These different types of BSs can have different transmit power levels, different coverage areas, and different impacts on interference. For example, macro BSs can have a high transmit power level (e.g., 20 Watts) whereas pico BSs, femto BSs, and relays can have a lower transmit power level (e.g., 1 Watt).

[0052] Wireless network 100 can support synchronous or asynchronous operation. For synchronous operation, the BSs can have similar frame timing, and transmissions from different BSs can be approximately aligned in time. For asynchronous operation, the BSs can have different frame timing, and transmissions from different BSs can not be aligned in time. The techniques described herein can be used for both synchronous and asynchronous operation.

[0053] A network controller 130 can couple to a set of BSs and provide coordination and control for these BSs. Network controller 130 can be in communication with the BSs 110 via a backhaul. The BSs 110 can also communicate with one another, e.g., directly or indirectly via wireless or wireline backhaul.

[0054] The UEs 120 (e.g., 120x, 120y, etc.) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. A UE can also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a health care device, a biometric sensor / device, a wearable device such as a smart watch, smart clothing, smart glasses, virtual reality goggles, a smart wrist band, smart jewelry (e.g., a smart ring, a smart necklace, etc.), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicular component or sensor, a smart meter / sensor, a robot, a drone, industrial manufacturing equipment, a positioning device (e.g., GPS, Beidou, terrestrial), or any other suitable device that is configured to communicate via a wireless or wired medium. Some UEs can be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices, which can include remote devices that can communicate with a base station, another remote device, or some other entity. Machine-type communication (MTC) can refer to communication involving at least one remote device on at least one end of the communication. MTC devices can include, for example, robots, drones, remote devices, sensors, meters, monitors, cameras, location tags, etc., which can communicate with a base station, another device (e.g., remote device), or some other entity. A wireless node can provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. MTC UEs, as well as other UEs, can be implemented as Internet-of-Things (IoT) devices, e.g., Narrowband IoT (NB-IoT) devices.

[0055] In FIG. 1 , a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS selected by the UE to serve the UE on the downlink and / or uplink. A dashed line with double arrows indicates transmissions between a UE and a BS, which can be interfered with transmissions.

[0056] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, often referred to as tones, bins, etc. Each subcarrier can be modulated with data. Generally speaking, modulation symbols are sent in the frequency domain for OFDM and in the time domain for SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the subcarrier spacing can be 15 kHz, and the minimum resource allocation (called a 'resource block') can be 12 subcarriers (or 180 kHz). Thus, the nominal FFT size can be equal to 128, 256, 512, 1024, or 2048 for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), respectively. The system bandwidth can also be divided into subbands. For example, a subband may cover 1.08 MHz (e.g., 6 resource blocks), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

[0057] While aspects of the examples described herein can be associated with LTE technologies, aspects of the present disclosure can be applicable with other wireless communications systems, such as NR. NR can utilize OFDM with a CP on the uplink and downlink, and include support for half-duplex operation using time division duplex (TDD). A single component carrier bandwidth of 100 MHz can be supported. NR resource blocks can span 12 subcarriers with a subcarrier bandwidth of 75 kHz over a 0.1 ms duration. Each radio frame can consist of 50 subframes with a length of 10 ms (a period). Consequently, each subframe can have a length of 0.2 ms. In some cases, a subframe can have a length of 1 ms (a duration) and each subframe can be further divided into two slots of 0.5 ms each (e.g., with 6 or 7 OFDM symbols for each slot depending on the CP length). The slots can be further divided into mini-slots of smaller duration (e.g., containing fewer symbols than a full slot). Each subframe

[0058] In some examples, access to an air interface can be scheduled, where a scheduling entity (e.g., a base station) allocates resources for communication among some or all of the devices and equipment within its serving area or cell. Within the present disclosure, as will be discussed further below, a scheduling entity can be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity. A base station is not the only entity that can function as a scheduling entity. That is, in some examples, a UE can function as a scheduling entity, thereby scheduling resources for one or more subordinate entities (e.g., one or more other UEs). In that example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication. A UE can function as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In a mesh networking example, UEs can optionally communicate directly with one another in addition to communicating with a scheduling entity.

[0059] Thus, in a wireless communication network having scheduled access to time-frequency resources and having a cellular configuration, a P2P configuration, and a mesh configuration, a scheduling entity and one or more subordinate entities may communicate using the scheduled resources.

[0060] As mentioned above, the RAN may include a CU and a DU. A NR BS (e.g., an eNB, a 5G Node B, a Node B, a Transmit Receipt Point (TRP), an Access Point (AP)) may correspond to one or more BSs. An NR cell may be configured as an access cell (ACell) or a data-only cell (DCell). For example, the RAN (e.g., a central unit or a distributed unit) may configure these cells. A DCell may be a cell used for carrier aggregation or dual connectivity but not for initial access, cell selection / reselection, or handover. In some cases, a DCell may not transmit a synchronization signal—in some cases, a DCell may transmit an SS. The NR BS may transmit a downlink signal to the UE to indicate the cell type. Based on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine the NR BS to be considered for cell selection, access, handover, and / or measurement based on the indicated cell type.

[0061] FIG. 2 Illustrated is an example logical architecture of a distributed radio access network (RAN) 200, which may be FIG. 1 206. The 5G access node 206 may include an access node controller (ANC) 202. The ANC may be a central unit (CU) of the distributed RAN 200. The backhaul interface to the next generation core network (NG-CN) 204 may terminate at the ANC. The backhaul interface to the adjacent next generation access node (NG-AN) may terminate at the ANC. The ANC may include one or more TRPs 208 (which may also be referred to as a BS, NR BS, B node, 5G NB, AP, gNB or some other terminology). As described above, TRP may be used interchangeably with "cell".

[0062] TRP 208 may be a DU. A TRP may be connected to one ANC (ANC 202) or more than one ANC (not illustrated). For example, for RAN sharing, Radio as a Service (RaaS), and service-specific ANC deployments, a TRP may be connected to more than one ANC. A TRP may include one or more antenna ports. TRPs may be configured to serve traffic to a UE individually (e.g., dynamically selected) or jointly (e.g., for joint transmission).

[0063] The local RAN architecture 200 can be used to illustrate fronthaul definition. The architecture can be defined to support fronthauling solutions across different deployment types. For example, the architecture can be based on transmit network capabilities (e.g., bandwidth, latency, and / or jitter).

[0064] The architecture can share features and / or components with LTE. According to aspects, the next generation AN (NG-AN) 210 can support dual connectivity with NR. The NG-AN can share a common fronthaul for LTE and NR.

[0065] The architecture can enable cooperation between and among TRPs 208. For example, cooperation can be preset within a TRP and / or across TRPs via an ANC 202. According to aspects, no inter-TRP interface can be needed / present.

[0066] According to aspects, dynamic configuration of split logical functions can be present within the architecture 200. As will be described in more detail FIG. 5 As will be described in more detail, the Radio Resource Control (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, and a Physical (PHY) layers can be adaptably placed at the DU or CU (e.g., at the TRP or ANC, respectively). According to certain aspects, a BS can include a central unit (CU) (e.g., ANC 202) and / or one or more distributed units (e.g., one or more TRPs 208).

[0067] FIG. 3 An example physical architecture of a distributed RAN 300 is illustrated. A centralized core network unit (C-CU) 302 can host core network functions. The C-CU can be centrally deployed. C-CU functionality can be offloaded (e.g., to advanced wireless services (AWS)), in an effort to handle peak capacity.

[0068] A centralized RAN unit (C-RU) 304 can host one or more ANC functions. Optionally, the C-RU can host core network functions locally. The C-RU can have a distributed deployment. The C-RU can be closer to the network edge.

[0069] A DU 306 can host one or more TRPs (edge node (EN), edge unit (EU), radio head (RH), smart radio head (SRH), etc.). The DU can be located at edges of the network with radio frequency (RF) functionality.

[0070] FIG. 4 An example architecture is illustrated FIG. 11 and 120, which may be used to implement various aspects of the present disclosure. As described above, the BS may include a TRP. One or more components of the BS 110 and UE 120 may be used to practice various aspects of the present disclosure. For example, the antenna 452, processors 466, 458, 464, and / or controller / processor 480 (for implementing transceiver or separate receiver and transmitter chain functions) of the UE 120 may be used to perform FIG. 11 Similarly, antennas 434, processors 430, 420, 438, and / or controller / processor 440 of BS 110 may be used to perform FIG. 12 Operation 1200.

[0071] FIG. 4 A block diagram shows a design of a BS 110 and a UE 120, which may be FIG. 1 For the scenario of constrained association, the base station 110 can be FIG. 1 1. The macro BS 110c in FIG. 1 may be macro BS 110c, and UE 120 may be UE 120y. Base station 110 may also be some other type of base station. Base station 110 may be equipped with antennas 434a through 434t, and UE 120 may be equipped with antennas 452a through 452r.

[0072] At base station 110, a transmit processor 420 can receive data from a data source 412 and control information from a controller / processor 440. The control information can be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), etc. The data can be for the physical downlink shared channel (PDSCH), etc. The processor 420 can process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Processor 420 can also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signals. A transmit (TX) multiple-input multiple-output (MIMO) processor 430 can perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and can provide output symbol streams to the modulators (MODs) 432a through 432t. For example, TX MIMO processor 430 can perform certain aspects described herein for RS multiplexing. Each modulator 432 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 432 can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 432a through 432t can be transmitted via antennas 434a through 434t, respectively.

[0073] At UE 120, antennas 452a through 452r can receive the downlink signals from base station 110 and can provide received signals to demodulators (DEMOD) 454a through 454r, respectively. Each demodulator 454 can condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 454 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 456 can obtain received symbols from all demodulators 454a through 454r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. For example, MIMO detector 456 can provide detected RS transmitted using techniques described herein. A receive processor 458 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, providing decoded data for UE 120 to a data sink 460, and provide decoded control information to a controller / processor 480. According to one or more aspects, CoMP aspects can include providing antennas and some Tx / Rx functionality such that they reside in a distributed unit. For example, some Tx / Rx processing can be done in a central unit, while other processing can be done at the distributed unit. For example, according to one or more aspects as shown in the diagram, BS modulator / demodulator 432 can be in a distributed unit.

[0074] On the uplink, at UE 120, a transmit processor 464 can receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source 462 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller / processor 480. The transmit processor 464 can also generate reference symbols for a reference signal. The symbols from the transmit processor 464 can be precoded by a TX MIMO processor 466 if applicable, further processed by the demodulators 454a through 454r (e.g., for SC-FDM, etc.), and transmitted to the base station 110. At the BS 110, the uplink signals from the UE 120 can be received by the antennas 434, processed by the modulators 432, detected by a MIMO detector 436 if applicable, and further processed by a receive processor 438 to obtain decoded data and control information sent by the UE 120. The receive processor 438 can provide the decoded data to a data sink 439 and the decoded control information to the controller / processor 440.

[0075] The controllers / processors 440 and 480 can direct the operation at the base station 110 and the UE 120, respectively. The processor 440 and / or other processors and modules at the base station 110 can perform or direct the process for the techniques described herein, as FIG. 10 described above. The processor 480 and / or other processors and modules at the UE 120 can also perform or direct the process for the techniques described herein, as described above. The memories 442 and 482 can store data and program codes for BS 110 and UE 120, respectively. A scheduler 444 can schedule UEs for data transmission on the downlink and / or uplink. FIG. 9

[0076] FIG. 5 An example diagram 500 is illustrated showing an example for implementing a communication protocol stack in accordance with aspects of the present disclosure is described. The illustrated communication protocol stack can be implemented by a device operating in a 5G system (e.g., a system supporting uplink-based mobility). The diagram 500 illustrates a communication protocol stack including a radio resource control (RRC) layer 510, a packet data convergence protocol (PDCP) layer 515, a radio link control (RLC) layer 520, a medium access control (MAC) layer 525, and a physical (PHY) layer 530. In various examples, these layers of the protocol stack can be implemented as separate software modules, portions of a processor or ASIC, portions of non-co-located devices connected by a communication link, or various combinations thereof. Co-located and non-co-located implementations can be used, for example, in a protocol stack for a network access device (e.g., an AN, a CU, and / or a DU) or a UE.

[0077] ​A first option 505-a illustrates a split implementation of the protocol stack, where the implementation of the protocol stack is split between a centralized network access device (e.g., the ANC 202 in FIG. 2 FIG. 2 The CU and the DU can be co-located or non-co-located. The first option 505-a can be useful in macrocell, microcell, or pico cell deployments.

[0078] A second option 505-b illustrates a unified implementation of the protocol stack, where the protocol stack is implemented in a single network access device (e.g., an access node (AN), a new radio base station (NR BS), a new radio Node-B (NR NB), a network node (NN), etc.). In the second option, the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530 can each be implemented by the AN. The second option 505-b can be useful in femtocell deployments.

[0079] Regardless of whether the network access device implements part or all of the protocol stack, the UE can implement the entire protocol stack (e.g., the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530).

[0080] FIG. 6 is a diagram illustrating an example of a frame format 600 for NR. The transmission timeline for each of the downlink and uplink can be partitioned into units of radio frames. Each radio frame can have a predetermined duration (e.g., 10 milliseconds) and can be partitioned into 10 subframes with indices of 0 through 9. Each subframe can include a variable number of time slots, depending on the subcarrier spacing. Each time slot can include a variable number of symbol periods (e.g., 7 or 14 symbol periods), depending on the subcarrier spacing. Symbol periods in each time slot can be assigned indices. A mini-slot (which can be referred to as a sub-slot structure) refers to a transmission time interval having a duration that is less than a time slot (e.g., 2, 3, or 4 symbol periods).

[0081] Each symbol in a slot can indicate a link direction (e.g., DL, UL, or flexible) for data transmission, and the link direction for each subframe can be dynamically switched. The link direction can be based on a slot format. Each slot can include DL / UL data as well as DL / UL control information.

[0082] ​In NR, a synchronization signal (SS) block is transmitted. The SS block includes PSS, SSS, and two-symbol PBCH. The SS block can be in a fixed time slot position (such as FIG. 6 ) is transmitted in the symbol 0-3 shown in . PSS and SSS can be used by UE for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identity. PBCH carries some basic system information, such as downlink system bandwidth, timing information within a radio frame, SS burst set periodicity, system frame number, etc. SS blocks can be organized into SS bursts to support beam sweeping. Further system information (such as remaining minimum system information (RMSI), system information block (SIB), other system information (OSI)) can be transmitted on the physical downlink shared channel (PDSCH) in certain subframes.

[0083] The UE may operate in various radio resource configurations, including a configuration associated with transmitting pilot signals using a dedicated set of resources (e.g., a radio resource control (RRC) dedicated state, etc.) or a configuration associated with transmitting pilot signals using a shared set of resources (e.g., an RRC shared state, etc.). When operating in the RRC dedicated state, the UE may select a dedicated set of resources for transmitting pilot signals to the network. When operating in the RRC shared state, the UE may select a shared set of resources for transmitting pilot signals to the network. In either case, the pilot signals transmitted by the UE may be received by one or more network access devices (such as an AN, a DU, or portions thereof). Each receiving network access device may be configured to receive and measure pilot signals transmitted on the shared set of resources, and also receive and measure pilot signals transmitted on the dedicated set of resources allocated to the UE, where the network access device is a member of a monitoring set of network access devices for the UE. One or more receiving network access devices, or a CU to which the receiving network access device transmits pilot signal measurements, may use these measurements to identify the UE's serving cell or initiate a change of the serving cell for one or more UEs.

[0084] Example QCL signaling

[0085] In many cases, it is important for a UE to know which assumptions it can make about the channels corresponding to different transmissions. For example, a UE may need to know which reference signals it can use to estimate the channel in order to decode a transmitted signal (e.g., PDCCH or PDSCH). For scheduling, link adaptation, and / or beam management purposes, it is also important for the UE to be able to report relevant channel state information (CSI) to the BS (e.g., gNB). In NR, the concepts of Quasi Co-location (QCL) and Transmission Configuration Indicator (TCI) states are used to convey information about these assumptions.

[0086] QCL assumptions are generally defined in terms of channel properties. Per 3GPP TS 38.214, “two antenna ports are said to be quasi co-located if properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed.” Different reference signals (RSs) can be considered to be quasi co-located (QCLed) if a receiver (e.g., a UE) can apply channel properties determined by detecting a first reference signal to help detect a second signal. A TCI state generally includes configurations such as QCL relationships (e.g., between a DL RS in one CSI-RS set and a PDSCH DMRS port).

[0087] In some cases, a UE can be configured with up to M TCI states. The configuration of the M TCI states can be via higher layer signaling, while the UE can be signaled to decode a PDSCH according to a detected PDCCH with DCI indicating one of the TCI states. For example, a particular TCI state can be indicated by an N-bit DCI field for PDSCH. Each configured TCI state can include one RS set TCI-RS-SetConfig indicating different QCL assumptions between certain source signals and a target signal.

[0088] In certain deployments, various techniques are used to provide quasi co-location (QCL) signaling for reference signals (RSs) and channels across scenarios involving multiple cells, such as coordinated multipoint (CoMP) scenarios where multiple transmission reception points (TRPs) or integrated access and backhaul (IAB) nodes each have their own cell ID.

[0089] FIG. 7 Examples are illustrated of how RSs associated with a TCI state can be configured via radio resource control (RRC) signaling. In some scenarios, the QCL information and / or type can depend on or be a function of other information. For example, a quasi co-location (QCL) type indicated to a UE can be based on a higher layer parameter QCL-Type, and can take one or a combination of the following types:

[0090] QCL Type A: {Doppler shift, Doppler spread, average delay, and delay spread};

[0091] QCL Type B: {Doppler shift, Doppler spread},

[0092] QCL Type C: {average delay, Doppler shift}, and

[0093] QCL Type D: {spatial Rx parameters},

[0094] A spatial QCL assumption (QCL-TypeD) can be used to help the UE select an analog Rx beam (e.g., during a beam management procedure). For example, an SSB resource indicator can indicate that the same beam used for a previous reference signal should be used for a subsequent transmission.

[0095] As FIG. 7 illustrated, a TCI state can indicate which RSs are QCLed and the QCL type. The TCI state can also indicate a ServCellIndex, which is a short identification used to identify a serving cell, such as a primary cell (PCell) or a secondary cell (Scell) in a carrier aggregation (CA) deployment. A value of 0 for this field can indicate a PCell, while a previously assigned ScellIndex can apply to an SCell.

[0096] FIG. 8 Examples of associations of DL reference signals to corresponding QCL types that can be indicated by a TCI-RS-SetConfig are illustrated.

[0097] In the example of FIG. 8 , a source reference signal (RS) is indicated in the top block and is associated with a target signal indicated in the bottom block. In this context, a target signal generally refers to a signal whose channel properties can be inferred by measuring those channel properties for the associated source signal. As mentioned above, the UE can use the source RS to determine various channel parameters depending on the associated QCL type, and use those various channel properties (determined based on the source RS) to process the target signal. The target RS does not necessarily need to be the DMRS of PDSCH, but it can be any other RS: PUSCH DMRS, CSI RS, TRS, and sounding reference signal (SRS).

[0098] As illustrated, each TCI-RS-SetConfig contains parameters. For example, these parameters can configure the quasi-co-location(s) between the reference signals in the RS set and the DM-RS port group of PDSCH. The RS set contains references to one or two DL RSs and an associated quasi-co-location type (QCL-Type) for each DL RS configured by the higher layer parameter QCL-Type.

[0099] As FIG. 8As illustrated, for the case of two DL RS, the QCL types can take various arrangements. For example, the QCL types can not be the same, whether the same DL RS or different DL RS is referenced. In the illustrative example, an SSB is associated with Type-C QCL for P-TRS, while a CSI-RS for beam management (CSIRS-BM) is associated with Type-D QCL.

[0100] FIG. 9 An example Media Access Control (MAC) Control Element (CE) 900 for activating or deactivating TCI states for a UE-specific Physical Downlink Shared Channel (PDSCH) is illustrated in accordance with previously known techniques (e.g., Release 15). The example MAC CE includes multiple octets 910, 920, 930, 940, etc. The first octet 910 includes a Serving Cell ID field 912 that is 5 bits in length and indicates the identity of the serving cell to which the MAC CE applies. The first octet also includes a BWP ID field 914 that is 2 bits in length and indicates the Downlink (DL) Bandwidth Part (BWP) to which the MAC CE applies as a codepoint of the Downlink Control Information (DCI) Bandwidth Part Indicator field as specified in TS 38.212 (available from the 3GPP website and other sources). The second octet 920 and subsequent octets include indications of TCI states for the serving cell ID and BWP ID. For each TCI state, a TCI State ID field 922 is 3 bits in length and indicates the TCI state ID of the TCI state. A TCI State Activation / Deactivation field 924 is 1 bit in length and indicates the activation or deactivation status of the TCI state with TCI state ID i. i If a TCI state with TCI state ID i exists as specified in TS 38.331 (also available from 3GPP), the corresponding TCI State Activation / Deactivation field 924 is set to 1 to indicate that the TCI state with TCI state ID i is activated, and is mapped to a codepoint of the DCI Transmission Configuration Indication field as specified in TS 38.214 (available from 3GPP). If a TCI state with TCI state ID i does not exist, the corresponding TCI State Activation / Deactivation field 924 is set to 0, and the MAC entity ignores the TCI State ID field 922 and the TCI State Activation / Deactivation field 924 for that TCI state. i The TCI State Activation / Deactivation field 924 indicates the activation or deactivation status of the TCI state with TCI state ID i, otherwise (i.e., a TCI state with TCI state ID i does not exist) the MAC entity ignores the TCI State Activation / Deactivation field 924 for that TCI state. i The TCI State Activation / Deactivation field 924 is set to 1 to indicate that the TCI state with TCI state ID i is activated, and is mapped to a codepoint of the DCI Transmission Configuration Indication field as specified in TS 38.214 (available from 3GPP). i The TCI State Activation / Deactivation field 924 is set to 0 to indicate that the TCI state with TCI state ID i is deactivated, and is not mapped to a codepoint of the DCI Transmission Configuration Indication field. The codepoint to which a TCI state is mapped is determined by its ordinal position among all TCI states with TCI State Activation / Deactivation field 924 set to 1, i.e., the first TCI state with TCI State Activation / Deactivation field 924 set to 1 should be mapped to codepoint value 0, the second TCI state with TCI State Activation / Deactivation field 924 set to 1 should be mapped to codepoint value 1, and so on. i The TCI State Activation / Deactivation field 924 is set to 1 to indicate that the TCI state with TCI state ID i is activated, and is mapped to a codepoint of the DCI Transmission Configuration Indication field as specified in TS 38.214 (available from 3GPP). i The TCI State Activation / Deactivation field 924 is set to 0 to indicate that the TCI state with TCI state ID i is deactivated, and is not mapped to a codepoint of the DCI Transmission Configuration Indication field. The codepoint to which a TCI state is mapped is determined by its ordinal position among all TCI states with TCI State Activation / Deactivation field 924 set to 1, i.e., the first TCI state with TCI State Activation / Deactivation field 924 set to 1 should be mapped to codepoint value 0, the second TCI state with TCI State Activation / Deactivation field 924 set to 1 should be mapped to codepoint value 1, and so on. i The TCI State Activation / Deactivation field 924 is set to 1 to indicate that the TCI state with TCI state ID i is activated, and is mapped to a codepoint of the DCI Transmission Configuration Indication field as specified in TS 38.214 (available from 3GPP). iThe second TCI state of the field should be mapped to codepoint value 1, and so on. The maximum number of activated TCI states can be 8.

[0101] FIG. 10 An example MAC CE 1000 for activating or deactivating TCI states for PDCCH according to previously known techniques (e.g., Release 15) is illustrated. A first octet 1010 includes a serving cell ID field 1012, which is 5 bits in length and indicates the identity of the serving cell to which the MAC CE applies. The last three bits 1014 and the first bit 1022 of a second octet 1020 make up a CORESET ID field, which is 4 bits in length and indicates the control resource set (CORESET) identified by the control resource set ID (e.g., as specified in TS 38.331, available from 3GPP) for which the TCI state is being indicated. If the value of the field is 0, the field refers to the control resource set configured by controlResourceSet0 (e.g., as specified in TS 38.331). The second octet 1020 includes a TCI state ID field, which is 7 bits in length and indicates the TCI state identified by the TCI state ID (e.g., as specified in TS 38.331) that is applicable to the control resource set identified by the CORESET ID field. If the value of the CORESET ID field is set to 0, the TCI state ID field indicates the TCI state ID of one of the first 64 TCI states configured by the tci-States-ToAddModList and the tci-States-ToReleaseList in PDSCH-Config in the active BWP. If the value of the CORESET ID field is set to a value other than 0, the TCI state ID field indicates the TCI state ID configured by the tci-StatesPDCCH-ToAddList and the tci-StatesPDCCH-ToReleaseList in the control resource set identified by the indicated CORESET ID.

[0102] Example indications for joint updating of uplink and downlink beams

[0103] Aspects of the present disclosure provide mechanisms for indicating updates to be applied to uplink (UL) beams and downlink (DL) beams.

[0104] The techniques presented herein can help reduce signaling overhead and / or latency by applying common beam operation across both uplink control and data and downlink control and data. In conventional systems, spatial information for UL (e.g., regarding beams to use) and transmission configuration indication (TCI) state for DL are updated by different types of medium access (MAC) control elements (MAC-CEs) or radio resource control (RRC) signaling. However, aspects of the disclosure can reduce overhead and / or latency by allowing joint updates (e.g., applied simultaneously or otherwise applied together) when UL beams and DL beams correspond to the same spatial filter.

[0105] As mentioned above, in mmW systems, both the UE and gNB apply directional beamforming, where the UE and gNB communicate via beam pair links. The beams for UL data (transmit beams), the beams for DL data (receive beams), and the beams for control signals are typically configured according to certain parameters. Such parameters can include, among other parameters, TCI state and spatial information. In one example, downlink beams are typically configured via DL TCI state, while uplink beams are typically configured via spatial relation information. In one example, uplink beams can be configured based on uplink TCI state. In some cases, TCI and spatial information are configured using different signaling.

[0106] In cases where UL beams and DL beams are used or updated simultaneously, the UL beams and DL beams can be paired. For example, if a UE has an uplink beam and downlink beam correspondence, the UL transmit beam and DL receive beam can receive signals from the same direction (e.g., to / from the same gNb). The UL and DL beams can share the same spatial filter. In some cases, where the UE can not have uplink beam and downlink beam correspondence, one or more UL transmit beams and one or more DL receive beams can be paired, e.g., in cases where they map to the same gNB beam. In such cases, aspects of the disclosure can help reduce signaling overhead and / or latency by applying common beam operation across both uplink control and data and downlink control and data. According to certain aspects of the disclosure, there are various options for implementing such common beam operation.

[0107] For example, in a first case, a single signaling transmission (e.g., DCI or MAC-CE) can signal a joint update of a downlink TCI ID and an uplink spatial relation ID. The downlink TCI ID can be determined from one or more target downlink signals. The uplink spatial relation ID can be determined from one or more target uplink signals. Alternatively, the selected uplink signal can be the uplink TCI ID. The target downlink signals can include one or more of a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information (CSI) reference signal (CSI-RS), for example. The target uplink signals can include one or more of a PUCCH, a PUSCH, an SRS, or a PRACH.

[0108] In some cases, according to a first case, a downlink beam ID and an uplink beam ID can be included in a single signaling (e.g., a single DCI and / or a single MAC-CE) to update both beams together. In other cases, a DL TCI ID and a UL beam ID can first be grouped together and then assigned a group ID. This group ID can be indicated in a group-common signaling (DCI / MAC-CE).

[0109] In a second case, a DCI transmission can update the TCI state of resources allocated to a reference signal (RS). The RS can be used as a quasi-co-located (QCL) source RS for both a DL TCI for one or more target DL signals and an UL spatial relation (or UL TCI) for one or more target UL signals. In one example, the resources can be for semi-persistent (SP) or aperiodic (AP) CSI-RS and / or SRS resources. In this way, a single DCI can update a common beam for multiple downlink signals and uplink signals.

[0110] In some cases, according to a second scenario, a downlink target signal (e.g., PDSCH / PDCCH / CSI-RS) can be linked to a TCI state. The TCI state can indicate a gNB beam that will transmit data and / or control signals. In some cases, in a TCI state configuration, a TCI state can be linked to a source RS (e.g., CSI-RS, synchronization signal block (SSB), or sounding reference signal (SRS)) such that the UE knows that the beam of the TCI state can use the same path to receive as when receiving the associated transmission (CSI-RS / SSB / or SRS). A similar link between a TCI state and a source RS can be applied on uplink beams (e.g., PUCCH / PUSCH -> spatial relation information -> CSI-RS / SSB / SRS). In such cases, if the source RS of the DL TCI and the UL SRS source indicator (SRI) are equivalent (e.g., semi-persistent / SP or aperiodic / AP CSI-RS and / or SRS), then the source RS TCI state information can be updated to effectively update the corresponding uplink and downlink beams. In cases where DCI is used (as opposed to MAC-CE), then latency can be reduced, which can be helpful in certain scenarios (e.g., ultra-reliable low-latency connectivity (URLLC)).

[0111] In a third scenario, a common beam can be indicated to a DL / UL resource group. In one example, a gNB can indicate a DL / UL resource group that shares a common beam via RRC / MAC-CE / DCI. In another example, RRC signaling can configure a resource group ID for each DL / UL resource in the group or for a list of DL / UL resources in the group. The group ID can be a common beam indication or a resource ID whose beam is used as a common beam. For example, CSI-RS resource ID No. 1 and SRS resource ID No. 2 can follow a common beam of CORESET ID No. 3.

[0112] In some cases, according to a second scenario, DL / UL resources can be grouped together (e.g., CSI-RS and SRS resources are grouped together) and assigned a group resource ID. The group resource can be mapped to a common beam indicator, and signaling can update the common beam indicator, which can act to update the UL / DL beams simultaneously.

[0113] FIG. 11 FIG. 11 is a flow diagram illustrating example operations 1100 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 1100 can be performed, for example, by a UE (e.g., such as the UE 120a in the wireless communication network 100). Operations 1100 can be implemented as software components that are executed and run on one or more processors (e.g., controller / processor 280 of the UE 120a). Further, the transmission and reception lines of the operations 1100 can be considered as representing FIG. 4software components that are executed and run on the one or more processors 480 (e.g., controller / processor 480) of the UE. Further, the transmission and reception of signals by the UE in operations 1100 can be enabled, e.g., via one or more antennas 452 in communication with the one or more processors 480 (e.g., controller / processor 480). In certain aspects, the transmission and / or reception of signals by the UE can be implemented via a bus interface of the one or more processors 480 obtaining and / or outputting signals. FIG. 4

[0114] The operations 1100 begin, at 1102, by receiving signaling from a network entity indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively. The signaling from the network entity to the UE can indicate a beam update procedure from any of the above common beam operations described above according to parameters such as TCI states or spatial relations.

[0115] The signaling can include a single DCI or MAC CE indicating an update to a receive beam via a downlink TCI ID of one or more target downlink signals and indicating an update to a transmit beam via an uplink spatial relation ID or uplink TCI ID of one or more target uplink signals. The target downlink signals can include at least one of a PDSCH, a PDCCH, or a CSI-RS, and the target uplink signals include at least one of a PUSCH, a PUCCH, an SRS, or a PRACH. The single DCI or MAC CE can indicate both an ID of a receive beam and an ID of a transmit beam. In one example, the signaling indicating a downlink TCI ID and an UL beam ID can be grouped together and assigned a group ID, where the DCI or MAC CE indicates the group ID. The group ID can be a common beam indication whose beams are used as common beams, a UL / DL resource, or a resource ID.

[0116] ​The signaling can include DCI that updates a downlink TCI of at least one RS resource that is used as a QCL source RS in both a downlink TCI of one or more target downlink signals and an uplink spatial relation or an uplink TCI of one or more target uplink signals. The target downlink signals can include at least one of a PDSCH, a PDCCH, or a CSI-RS that is linked to a TCI state that indicates a beam that a network entity is to use to transmit the target downlink signals. The TCI state can be linked to at least one of a CSI-RS, an SSB, or a sounding reference signal that is used as a source RS for the TCI. The target uplink signals can include at least one of a PUSCH or a PUCCH that is linked to a TCI state that indicates a beam that a network entity is to use to transmit one or more source reference signals. The TCI state can be linked to at least one of a CSI-RS, an SSB, or a sounding reference signal that is used as a source RS for the TCI.

[0117] In one example, the signaling can include at least one of DCI, RRC signaling, or a MAC-CE that updates a common beam for a set of downlink resources and uplink resources. The group of downlink resources and uplink resources can be indicated via at least one of RRC signaling, a MAC CE, or DCI. The group of downlink resources and uplink resources can be identified by at least one of a group ID or a resource ID of its beam that is used as a common beam for resources with a same resource ID.

[0118] In one example, the signaling can be provided via a WUS, and the UE can be configured to apply the update in one or more ON durations after the WUS. The UE can transmit, to the network entity, signaling that indicates a capability of the UE to support the update of the pair of transmit and receive beams according to one or more options, and receive, from the network entity, signaling that indicates an enablement of one or more of the options. The enablement can be signaled via at least one of RRC signaling, a MAC CE, or DCI.

[0119] At 1104, the UE processes at least one of an uplink transmission or a downlink transmission in accordance with the update.

[0120] FIG. 12 FIG. 12 is a flow chart illustrating example operations 1200 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 1200 can be performed, for example, by a BS (e.g., such as the BS 110a in the wireless communication network 100). The operations 1200 can be complementary to the operations 1100 performed by the UE. The operations 1200 can be implemented as software components that are executed and run on one or more processors (e.g., controller / processor 440 of FIG. 4). FIG. 4software components that are executed and run on the one or more processors (e.g., controller / processor 440) of the BS. Further, the transmission and reception of signals by the BS in operations 1200 can be enabled, e.g., via one or more antennas (e.g., antennas 434) of the BS. In certain aspects, the transmission and / or reception of signals by the BS can be implemented via a bus interface of one or more processors (e.g., controller / processor 440) obtaining and / or outputting signals. FIG. 4

[0121] Operation 1200 begins with transmitting signaling to a user equipment indicating an update to a pair of transmit and receive beams used by the UE for uplink transmission and downlink transmission, respectively, at 1202. The signaling from the network entity to the UE can indicate a beam update procedure from any of the above common beam operations according to parameters such as TCI states or spatial relations.

[0122] The signaling can include a single DCI or MAC CE that indicates an update to a receive beam via a downlink TCI ID of one or more target downlink signals and an update to a transmit beam via an uplink spatial relation ID or uplink TCI ID of one or more target uplink signals. The target downlink signals can include at least one of a PDSCH, a PDCCH, or a CSI-RS, and the target uplink signals can include at least one of a PUSCH, a PUCCH, an SRS, or a PRACH. The single DCI or MAC CE can indicate both an ID of a receive beam and an ID of a transmit beam. In one example, the BS can transmit signaling to the UE indicating that a downlink TCI ID and a UL beam ID are grouped together and assigned a group ID, where the DCI or MAC CE indicates the group ID. The group ID can be a common beam indication whose beams are used as common beams, a UL / DL resource, or a resource ID.

[0123] ​In one example, the signaling can include DCI that updates a downlink TCI of at least one RS resource that is used as a QCL source RS in both a downlink TCI of one or more target downlink signals and an uplink spatial relation or an uplink TCI of one or more target uplink signals. The target downlink signals can include at least one of a PDSCH, a PDCCH, or a CSI-RS that is linked to a TCI state that indicates a beam that the network entity is to use to transmit the target downlink signals. The TCI state can be linked to at least one of a CSI-RS, an SSB, or a sounding reference signal that is used as a source RS for the TCI. The target uplink signals can include at least one of a PUSCH or a PUCCH that is linked to a TCI state that indicates a beam that the network entity is to use to transmit one or more source reference signals. The TCI state can be linked to at least one of a CSI-RS, an SSB, or a sounding reference signal that is used as a source RS for the TCI.

[0124] In one example, the signaling can include at least one of DCI, RRC signaling, or a MAC-CE that updates a common beam for a set of downlink resources and uplink resources. The group of downlink resources and uplink resources can be indicated via at least one of RRC signaling, a MAC CE, or DCI. The group of downlink resources and uplink resources can be identified by at least one of a group ID or a resource ID of the group of downlink resources and uplink resources whose beams are used as a common beam for resources with a same resource ID.

[0125] In one example, the signaling is provided via a WUS, and the UE can be configured to apply the update in one or more ON durations following the WUS.

[0126] In one example, a BS can receive, from a UE, signaling indicating a capability of the UE to support an update of a pair of transmit and receive beams according to one or more options, and transmit, to the UE, signaling indicating an enablement of one or more of the options. The enablement can be signaled via at least one of RRC signaling, a MAC CE, or DCI.

[0127] At 1204, the network entity processes at least one of an uplink transmission or a downlink transmission according to the update.

[0128] Operations 1100 and 1200 can help to further reduce overhead and / or latency by efficiently utilizing common beam operations (to update beam information) across DL control and data channels and UL control and data channels. Any of the above scenarios can be implemented to utilize common beam operations.

[0129] FIG. 13An example shared beam operation 1300 for uplink and downlink beams is illustrated. Here, a UL beam 1304 and a DL beam 1302 may be paired for shared beam operation, where they are used or updated simultaneously. If a UE 120 has an uplink beam and downlink beam correspondence, the UL beam 1304 and the DL beam 1302 may receive signals from the same network entity 110. The UL beam 1304 and the DL beam 1302 may also share the same spatial filter. If the UL beam 1304 and the DL beam 1302 are mapped to the same network entity 110 beam, they may be paired for shared beam operation. In one example, the shared beam operation 1300 may describe a single signaling transmission (e.g., DCI or MAC-CE) indicating a joint update of the downlink 1302 TCI ID and the uplink 1304 spatial relationship ID. In some cases, the downlink beam 1302 ID and the uplink beam 1304 ID may be included in a single signaling (e.g., a single DCI and / or a single MAC-CE) to update both beams together. In other cases, the DL TCI ID and UL beam ID may be grouped together first and then assigned a group ID. This group ID may be indicated in the group-shared signaling (DCI / MAC-CE).

[0130] FIG. 14 Illustrated may include operations configured to perform the techniques disclosed herein (such as, FIG. 11 14. The communication device 1400 includes various components (e.g., corresponding to means-plus-function components) that perform the operations illustrated in FIG. 14. The communication device 1400 includes a processing system 1402 coupled to a transceiver 1408 (e.g., a transmitter and / or receiver). The transceiver 1408 is configured to transmit and receive signals for the communication device 1400 (such as the various signals described herein) via an antenna 1410. The processing system 1402 can be configured to perform processing functions for the communication device 1400, including processing signals received and / or to be transmitted by the communication device 1400.

[0131] The processing system 1402 includes a processor 1404 coupled to a computer-readable medium / memory 1412 via a bus 1406. In some aspects, the computer-readable medium / memory 1412 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1404, cause the processor 1404 to perform FIG. 11The operations illustrated in FIG. 13, or other operations for performing the various techniques discussed herein for indications of uplink and downlink beams to update. In certain aspects, computer- readable medium / memory 1412 stores: code 1414 for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by a UE for uplink and downlink transmissions, respectively; and code 1416 for processing at least one of uplink transmissions or downlink transmissions in accordance with the update. In certain aspects, the processor 1404 has circuitry configured to implement code stored in the computer-readable medium / memory 1412. The processor 1404 includes: circuitry 1418 for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by a UE for uplink and downlink transmissions, respectively; and circuitry 1420 for processing at least one of uplink transmissions or downlink transmissions in accordance with the update.

[0132] For example, a means for transmitting (or a means for outputting for transmission) can include FIG. 4 The transmitter and / or antenna 434 of the BS 110a or the transmitter unit 454 and / or antenna 452 of the UE 120a illustrated in FIG. 13, and / or FIG. 14 The circuitry 1418 / 1420 of the communication device 1400 in FIG. 13. A means for receiving (or a means for obtaining) can include FIG. 4 The receiver and / or antenna 434 of the BS 110a or the receiver and / or antenna 452 of the UE 120a illustrated in FIG. 13, and / or FIG. 14 The circuitry 1418 / 1420 of the communication device 1400 in FIG. 13. A means for communicating can include a transmitter, a receiver, or both. A means for generating, a means for performing, a means for determining, a means for taking action, a means for determining, a means for coordinating, and / or a means for processing can include a processing system, which can include one or more processors, such as FIG. 4 The transmit processor 420, the TX MIMO processor 430, the receive processor 438, and / or the controller / processor 440 of the BS 110a or the receive processor 458, the transmit processor 464, the TX MIMO processor 466, and / or the controller / processor 480 of the UE 120a illustrated in FIG. 13, and / or FIG. 14 The processing system 1402 of the communication device 1400 in FIG. 13.

[0133] FIG. 15 The operations illustrated in FIG. 13, or other operations for performing the various techniques discussed herein for indications of uplink and downlink beams to update. In certain aspects, computer- readable medium / memory 1412 stores: code 1414 for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by a UE for uplink and downlink transmissions, respectively; and code 1416 for processing at least one of uplink transmissions or downlink transmissions in accordance with the update. In certain aspects, the processor 1404 has circuitry configured to implement code stored in the computer-readable medium / memory 1412. The processor 1404 includes: circuitry 1418 for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by a UE for uplink and downlink transmissions, respectively; and circuitry 1420 for processing at least one of uplink transmissions or downlink transmissions in accordance with the update. FIG. 12FIG. 15 is a diagram illustrating an example of a communications device 1500 that can include various components (e.g., corresponding to means-plus-function components) configured to perform the operations illustrated in FIG. 14, for example. The communications device 1500 includes a processing system 1502 coupled to a transceiver 1508 (e.g., a transmitter and / or a receiver). The transceiver 1508 is configured to transmit and receive signals for the communications device 1500 via an antenna 1510, such as the various signals as described herein. The processing system 1502 can be configured to perform processing functions for the communications device 1500, including processing signals received and / or to be transmitted by the communications device 1500.

[0134] The processing system 1502 includes a processor 1504 coupled to a computer- readable medium / memory 1512 via a bus 1506. In certain aspects, the computer-readable medium / memory 1512 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1504, cause the processor 1504 to perform aspects described herein, such as the operations illustrated in FIG. 14 or other operations for performing the various techniques discussed herein for indications to update uplink and downlink beams. FIG. 12 In certain aspects, the computer-readable medium / memory 1512 stores code 1514 for transmitting, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and code 1516 for processing at least one of uplink transmissions or downlink transmissions in accordance with the update. In certain aspects, the processor 1504 has circuitry configured to implement code stored in the computer-readable medium / memory 1512. The processor 1504 includes circuitry 1518 for transmitting, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and circuitry 1520 for processing at least one of uplink transmissions or downlink transmissions in accordance with the update.

[0135] For example, an apparatus for transmitting (or for outputting for transmission) can include FIG. 4 The transmitter and / or antenna 434 of the BS 110a illustrated in FIG. 14, or the transmitter unit 454 and / or antenna 452 of the UE 120a, and / or FIG. 15 The circuitry 1518 / 1520 of the communications device 1500 illustrated in FIG. 14. An apparatus for receiving (or for obtaining) can include FIG. 4 The receiver and / or antenna 434 of the BS 110a illustrated in FIG. 14, or the receiver and / or antenna 452 of the UE 120a, and / or FIG. 15circuitry 1518 / 1520 of the communication device 1500 in FIG. 15. The means for communicating can include a transmitter, a receiver, or both. The means for generating, the means for performing, the means for determining, the means for taking action, the means for determining, the means for coordinating, and / or the means for processing can include a processing system, which can include one or more processors, such as FIG. 4 the transmit processor 420, the TX MIMO processor 430, the receive processor 438, and / or the controller / processor 440 of the BS 110a illustrated in FIG. 4 or the receive processor 458, the transmit processor 464, the TX MIMO processor 466, and / or the controller / processor 480 of the UE 120a illustrated in FIG. 5, and / or FIG. 15 the processing system 1502 of the communication device 1500 in FIG. 15.

[0136] Example Aspects

[0137] Aspect 1 : A method for wireless communication performed by a user equipment (UE), comprising: receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and processing at least one of an uplink transmission or a downlink transmission in accordance with the update.

[0138] Aspect 2: The method of aspect 1, wherein the signaling comprises a single downlink control information (DCI) or medium access control (MAC) control element (CE) indicating the update to the receive beams via downlink transmission configuration indicator (TCI) IDs of one or more target downlink signals and indicating the update to the transmit beams via uplink spatial relation IDs or uplink TCI IDs of one or more target uplink signals.

[0139] Aspect 3: The method of aspect 2, wherein the target downlink signals comprise at least one of physical downlink shared channels (PDSCHs), physical downlink control channels (PDCCHs), or channel state information (CSI) reference signals (CSI-RSs), and the target uplink signals comprise at least one of physical uplink shared channels (PUSCHs), physical uplink control channels (PUCCHs), sounding reference signals (SRSs), or physical random access channels (PRACHs).

[0140] Aspect 4: The method of any of aspects 2 and 3, wherein the single DCI or MAC CE indicates both IDs of the receive beams and IDs of the transmit beams.

[0141] Aspect 5: The method of any of aspects 2-4, further comprising: receiving signaling indicating that a downlink TCI ID and a UL beam ID are grouped together and assigned a group ID, wherein the DCI or MAC CE indicates the group ID.

[0142] Aspect 6: The method of any of aspects 1-5, wherein the signaling comprises downlink control information (DCI) that updates a downlink transmission configuration indicator (TCI) for at least one reference signal (RS) resource used as a quasi co-located (QCL) source RS in both a downlink TCI for one or more target downlink signals and an uplink spatial relation or uplink TCI for one or more target uplink signals.

[0143] Aspect 7: The method of aspect 6, wherein a target downlink signal comprises at least one of a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), or a channel state information (CSI) reference signal (CSI-RS) that is linked to a TCI state indicating a beam that a network entity will use to transmit the target downlink signal.

[0144] Aspect 8: The method of aspect 7, wherein the TCI state is linked to at least one of a CSI-RS, a synchronization signal block (SSB), or a sounding reference signal that is used as a source RS for the TCI.

[0145] Aspect 9: The method of any of aspects 6 and 7, wherein a target uplink signal comprises at least one of a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) that is linked to a TCI state indicating a beam that a network entity will use to transmit one or more source reference signals.

[0146] Aspect 10: The method of aspect 9, wherein the TCI state is linked to at least one of a CSI-RS, a synchronization signal block (SSB), or a sounding reference signal that is used as a source RS for the TCI.

[0147] Aspect 11: The method of any of aspects 1-10, wherein the signaling comprises at least one of downlink control information (DCI), radio resource control (RRC) signaling, or a medium access control (MAC) control element (CE) that updates a common beam for a set of downlink resources and uplink resources.

[0148] Aspect 12: The method of aspect 11, wherein the group of downlink resources and uplink resources is indicated via at least one of RRC signaling, a MAC CE, or DCI.

[0149] Aspect 13: The method of any of aspects 11 and 12, wherein the group of downlink resources and uplink resources is identified by at least one of a group ID or a resource ID of its beams as a common beam having a same resource ID of resources.

[0150] Aspect 14: The method of any of aspects 1-13, wherein the signaling is provided via a wake-up signal (WUS) and the UE is configured to apply the update in one or more ON durations following the WUS.

[0151] Aspect 15: The method of any of aspects 1-14, further comprising: transmitting, to a network entity, signaling indicating a capability of the UE to support an update of the pair of transmit and receive beams according to one or more options, and receiving, from the network entity, signaling indicating an enablement of one or more of the options.

[0152] Aspect 16: The method of aspect 15, wherein the enablement is signaled via at least one of radio resource control (RRC) signaling, medium access control (MAC) control element (CE), or downlink control information (DCI).

[0153] Aspect 17: A method for wireless communications performed by a network entity, comprising: transmitting, to a user equipment, signaling indicating an update of a pair of transmit and receive beams used by the UE for uplink transmissions and downlink transmissions, respectively, and processing at least one of uplink transmissions or downlink transmissions according to the update.

[0154] Aspect 18: The method of aspect 17, wherein the signaling comprises a single DCI or MAC CE indicating the update of the receive beam via a downlink TCI ID of one or more target downlink signals and indicating the update of the transmit beam via an uplink spatial relation ID or an uplink TCI ID of one or more target uplink signals.

[0155] Aspect 19: The method of aspect 18, wherein the target downlink signals comprise at least one of PDSCH, PDCCH, or CSI-RS, and the target uplink signals comprise at least one of PUSCH, PUCCH, SRS, or PRACH.

[0156] Aspect 20: The method of any of aspects 18 and 19, wherein the single DCI or MAC CE indicates both an ID of the receive beam and an ID of the transmit beam.

[0157] Aspect 21 : The method of any of aspects 18-20, further comprising: transmitting, to the UE, signaling indicating that the downlink TCI ID and the UL beam ID are grouped together and assigned a group ID, wherein the DCI or MAC CE indicates the group ID.

[0158] Aspect 22: The method of any of aspects 17-21, wherein the signaling comprises DCI that updates a downlink TCI for at least one RS resource that is used as a QCL source RS in both a downlink TCI for one or more target downlink signals and an uplink spatial relation or an uplink TCI for one or more target uplink signals.

[0159] Aspect 23: The method of aspect 22, wherein the target downlink signals comprise at least one of PDSCH, PDCCH, or CSI-RS linked to a TCI state that indicates a beam that the network entity will use to transmit the target downlink signals.

[0160] Aspect 24: The method of aspect 23, wherein the TCI state is linked to at least one of the following that is used as a source RS for the TCI: a CSI-RS, an SSB, or a sounding reference signal.

[0161] Aspect 25: The method of any of aspects 22 and 23, wherein the target uplink signals comprise at least one of PUSCH or PUCCH linked to a TCI state that indicates a beam that the network entity will use to transmit one or more source reference signals.

[0162] Aspect 26: The method of aspect 25, wherein the TCI state is linked to at least one of the following that is used as a source RS for the TCI: a CSI-RS, an SSB, or a sounding reference signal.

[0163] Aspect 27: The method of any of aspects 17-26, wherein the signaling comprises at least one of DCI, RRC signaling, or a MAC-CE that updates a common beam for a set of downlink resources and uplink resources.

[0164] Aspect 28: The method of aspect 27, wherein the group of downlink resources and uplink resources is indicated via at least one of RRC signaling, a MAC CE, or DCI.

[0165] Aspect 29: The method of any of aspects 27 and 28, wherein the group of downlink resources and uplink resources is identified by at least one of a group ID or a resource ID for its beam that is a common beam for resources having the same resource ID.

[0166] Aspect 30: The method of any of aspects 17-29, wherein the signaling is provided via a WUS, and the UE is configured to apply the update in one or more ON durations after the WUS.

[0167] Aspect 31 : The method of any of aspects 17-30, further comprising: receiving, from the UE, signaling indicating a capability of the UE to support an update to the pair of transmit and receive beams according to one or more options, and transmitting, to the UE, signaling indicating an enablement of one or more of the options.

[0168] Aspect 32: The method of aspect 31, wherein the enablement is signaled via at least one of RRC signaling, a MAC CE, or DCI.

[0169] Aspect 33: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors and the memory being configured to: receive, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and process at least one of an uplink transmission or a downlink transmission according to the update.

[0170] Aspect 34: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors and the memory being configured to: transmit, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and process at least one of an uplink transmission or a downlink transmission according to the update.

[0171] Aspect 35: A computer-readable medium having computer executable code stored thereon, comprising code for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by a UE for uplink and downlink transmissions, respectively, and code for processing at least one of an uplink transmission or a downlink transmission according to the update.

[0172] Aspect 36: A computer-readable medium having computer executable code stored thereon, comprising code for transmitting, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and code for processing at least one of an uplink transmission or a downlink transmission according to the update.

[0173] Aspect 37: An apparatus comprising: means for receiving, from a network entity, signaling indicating an update to a pair of transmit and receive beams used by a UE for uplink and downlink transmissions, respectively, and means for processing at least one of uplink or downlink transmissions in accordance with the update.

[0174] Aspect 38: An apparatus for wireless communication comprising: means for sending, to a user equipment, signaling indicating an update to a pair of transmit and receive beams used by the UE for uplink and downlink transmissions, respectively, and means for processing at least one of uplink or downlink transmissions in accordance with the update.

[0175] Additional Considerations

[0176] The techniques described herein can be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA), time division synchronous code division multiple access (TD-SCDMA), and other networks. The terms “network” and “system” are often used interchangeably. A CDMA network can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and so on. UTRA includes Wideband-CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash- OFDMA, and so on. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). LTE and LTE-A are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP). cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). NR is an emerging wireless communications technology.

[0177] In 3GPP, the term "cell" can refer to a coverage area of a Node B (NB) and / or a NB subsystem serving this coverage area, depending on the context in which the term is used. In NR systems, the term “cell” and BS, next generation Node B (gNB or gNodeB), access point (AP), Distributed Unit (DU), carrier, or Transmission Reception Point (TRP) can be used interchangeably. A BS can provide communication coverage for a macro cell, a pico cell, a femto cell, and / or other types of cell. A macro cell can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions. A pico cell can cover a relatively small geographic area (e.g., a city neighborhood or a campus) and can allow unrestricted access by UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow restricted access by UEs with service subscriptions, e.g., UEs in an closed subscriber group (CSG) or UEs with an association to the femto cell. A BS for a macro cell can be referred to as a macro BS. A BS for a pico cell can be referred to as a pico BS. A BS for a femto cell can be referred to as a femto BS or a home BS.

[0178] A UE can also be known as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an electric appliance, a medical device or medical equipment, a biometric sensor / device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicular component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium. Some UEs can be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that can communicate with a BS, another device (e.g., remote device), or some other entity. A wireless node can provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet-of-Things (IoT) devices, which can be Narrowband IoT (NB-IoT) devices.

[0179] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication among some or all of the devices and equipment within its serving area or cell. The scheduling entity can be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity. A base station is not the only entity that can function as a scheduling entity. In some examples, a UE can function as a scheduling entity and can schedule resources for one or more subordinate entities (e.g., one or more other UEs), and the other UEs can utilize the resources scheduled by the UE. In some examples, a UE can act as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In a mesh networking example, UEs can communicate directly with one another, such as using a proscribed set of resources.

[0180] The methods disclosed herein comprise one or more steps or actions for achieving the methods. The method steps and / or actions can be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order is specified, the order or sequence of any step or action can be modified without departing from the scope of the claims.

[0181] As used herein, the phrase “at least one of” followed by a listing of two or more items means any one of those items can be present or any combination of those items can be present. For example, the phrase “at least one of a, b, and c” means that only a or only b or only c or any combination of a, b, and c can be present.

[0182] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” can include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, “determining” can include resolving, selecting, choosing, establishing and the like.

[0183] 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 can 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 of the 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." Unless specifically stated otherwise, the term "some" refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that enable a person skilled in the art to practice the disclosure are

[0184] Various operations described above can be performed by any suitable means capable of performing the corresponding functions. The means can include various hardware and / or software component(s) and / or module(s), including, but not limited to a circuit, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a processor, e.g., a general purpose processor or a specially programmed processor. Generally, where there are operations illustrated in figures, those operations can have corresponding counterpart means-plus-function components with similar numbering.

[0185] The various illustrative logical blocks, modules, and circuits described in connection with the disclosure can be implemented or performed with a general purpose processor, a DSP, an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD), a discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any commercially available processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0186] If implemented in hardware, an example hardware configuration can include a processing system in a wireless node. The processing system can be implemented with a bus architecture. The bus can include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints. The bus can link together various circuits such as a processor, machine-readable medium, and buses. A bus interface can be used to connect a network adapter to the processing system via the bus. The network adapter can be used to implement signal processing functionality of the PHY layer. In the case of a user terminal (see FIG. 1 ) a user interface (e.g., keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore will not be further described. The processor can be implemented with one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how to best implement the functionality described with respect to the processing system depending on the particular application and the overall design constraints imposed on the overall system.

[0187] If implemented in software, the functions can be stored or transmitted over as one or more instructions or code on a computer-readable medium. Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. The processor can be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media. A computer-readable storage medium can be coupled with the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. By way of example, the machine-readable media can include a transmission line, a carrier wave modulated by data, and / or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which can be accessed via the bus. Alternatively, or in addition, the machine-readable media, or any portion thereof, can be integrated into the processor, such as the cache and / or general register files of the processor. Examples of machine-readable storage media can include RAM (random access memory), flash memory, ROM (read only memory), PROM (programmable read only memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof. The machine-readable media can be embodied in a computer-program product.

[0188] A software module can comprise a single instruction, or many instructions, and can be distributed over several different code segments, among different programs, and across multiple storage media. The computer-readable media can comprise a number of software modules. The software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions. The software modules can include a transmission module and a receiving module. Each software module can reside in a single storage device or be distributed across multiple storage devices. By way of example, a software module can be loaded into RAM from a hard drive when a triggering event occurs. During execution of the software module, the processor can load some of the instructions into cache to increase access speed. One or more cache lines can then be loaded into a general register file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.

[0189] Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Thus, in some aspects computer-readable media can comprise non-transitory computer-readable media (e.g., tangible media). In addition, for other aspects computer-readable media can comprise transitory computer- readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0190] Thus, certain aspects can comprise a computer program product for performing the operations presented herein. For example, such a computer program product can comprise a computer-readable medium having instructions stored thereon, the instructions being executable by one or more processors to FIG. 11 and / or FIG. 12 perform the operations described herein, e.g., the operations described and illustrated in FIGs. 1-6 and 8-10.

[0191] ​Further, it should be appreciated that modules and / or other appropriate means for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by a user terminal and / or base station as applicable. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, various methods described herein can be provided via a storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.), such that a user terminal and / or base station can obtain the various methods upon coupling or providing the storage means to the device.

[0192] It will be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes, and adaptations will be apparent to others skilled in the art with the benefit of this disclosure. The scope of the claims should be determined by the appropriate scope of the following claims.

Claims

1. A method for performing wireless communication by a user equipment (UE), comprising: receiving signaling from a network entity indicating a simultaneous update with a first update to a transmit beam used by the UE for uplink transmission and a second update to a receive beam used by the UE for downlink transmission; as well as The simultaneous updating is performed by applying the first update to the uplink transmission and applying the second update to the downlink transmission.

2. The method of claim 1 , wherein the signaling comprises a single downlink control information (DCI) or medium access control (MAC) control element (CE) indicating: said second updating of the receive beam via a downlink transmission configuration indicator (TCI) ID of one or more target downlink signals; and The first updating of the transmit beam via an uplink spatial relation ID or uplink TCI ID of one or more target uplink signals.

3. The method of claim 2, wherein: The target downlink signal includes at least one of a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), or a channel state information (CSI) reference signal (CSI-RS); and The target uplink signal includes at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or a physical random access channel (PRACH).

4. The method of claim 2, wherein the single DCI or MAC CE indicates both the ID of the receive beam and the ID of the transmit beam.

5. The method of claim 2, further comprising: Receive signaling indicating that downlink TCI IDs and UL beam IDs are grouped together and assigned a group ID, wherein the DCI or MAC CE indicates the group ID.

6. A method as claimed in claim 1, wherein the signaling includes downlink control information (DCI), and the downlink control information (DCI) updates the downlink transmission configuration indicator (TCI) of at least one reference signal (RS) resource, and the at least one reference signal (RS) resource is used as a downlink TCI of one or more target downlink signals and an uplink spatial relationship of one or more target uplink signals or a quasi-co-located (QCL) source RS in both uplink TCI and uplink spatial relationship.

7. The method of claim 6, wherein the target downlink signal comprises at least one of a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), or a channel state information (CSI) reference signal (CSI-RS) linked to a TCI state indicating a beam that a network entity will use to transmit the target downlink signal.

8. The method of claim 7, wherein the TCI state is linked to at least one of the following used as a source RS for the TCI: a CSI-RS, a synchronization signal block (SSB), or a sounding reference signal.

9. The method of claim 6, wherein the target uplink signal comprises at least one of a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) linked to a TCI state indicating a beam to be used by a network entity to transmit one or more source reference signals.

10. The method of claim 9, wherein the TCI state is linked to at least one of the following used as a source RS for the TCI: a CSI-RS, a synchronization signal block (SSB), or a sounding reference signal.

11. The method of claim 1 , wherein the signaling comprises at least one of: downlink control information (DCI), radio resource control (RRC) signaling, or medium access control (MAC) control element (CE) to update a shared beam of a set of downlink resources and uplink resources.

12. The method of claim 11, wherein the set of downlink resources and uplink resources are identified by at least one of a group ID or a resource ID of a common beam whose beams use as resources with the same resource ID.

13. The method of claim 1, wherein: The signaling is provided via a wake-up signal (WUS); and The UE is configured to apply the update in one or more on durations following the WUS.

14. The method of claim 1, further comprising: sending signaling to the network entity indicating a capability of the UE to support the first update of the transmit beam and the second update of the receive beam according to one or more options; as well as Signaling is received from the network entity indicating activation of one or more of the options.

15. A method for performing wireless communication by a network entity, comprising: sending signaling to a user equipment (UE) indicating a simultaneous update with a first update to a transmit beam used by the UE for uplink transmission and a second update to a receive beam used by the UE for downlink transmission; as well as The simultaneous updating is performed by applying the first update to the uplink transmission and applying the second update to the downlink transmission.

16. The method of claim 15, wherein the signaling comprises a single downlink control information (DCI) or medium access control (MAC) control element (CE) indicating: said second updating of the receive beam via a downlink transmission configuration indicator (TCI) ID of one or more target downlink signals; and The first updating of the transmit beam via an uplink spatial relation ID or uplink TCI ID of one or more target uplink signals.

17. The method of claim 16, wherein: The target downlink signal includes at least one of a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), or a channel state information (CSI) reference signal (CSI-RS); and The target uplink signal includes at least one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or a physical random access channel (PRACH).

18. The method of claim 16, wherein the single DCI or MAC CE indicates both the ID of the receive beam and the ID of the transmit beam.

19. The method of claim 16, further comprising: Signaling indicating that downlink TCI ID and UL beam ID are grouped together and assigned a group ID is transmitted to the UE, wherein the DCI or MAC CE indicates the group ID.

20. A method as claimed in claim 15, wherein the signaling includes downlink control information (DCI), and the downlink control information (DCI) updates the downlink transmission configuration indicator (TCI) of at least one reference signal (RS) resource, and the at least one reference signal (RS) resource is used as a downlink TCI of one or more target downlink signals and an uplink spatial relationship of one or more target uplink signals or a quasi-co-located (QCL) source RS in both uplink TCI and uplink spatial relationship.

21. The method of claim 20, wherein the target downlink signal comprises at least one of a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), or a channel state information (CSI) reference signal (CSI-RS) linked to a TCI state indicating a beam that a network entity will use to transmit the target downlink signal.

22. The method of claim 21, wherein the TCI state is linked to at least one of the following used as a source RS for the TCI: a CSI-RS, a synchronization signal block (SSB), or a sounding reference signal.

23. The method of claim 20, wherein the target uplink signal comprises at least one of a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) linked to a TCI state indicating a beam to be used by a network entity to transmit one or more source reference signals.

24. The method of claim 23, wherein the TCI state is linked to at least one of the following used as a source RS for the TCI: a CSI-RS, a synchronization signal block (SSB), or a sounding reference signal.

25. The method of claim 15, wherein the signaling comprises at least one of: downlink control information (DCI), radio resource control (RRC) signaling, or media access control (MAC) control element (CE) to update a shared beam of a set of downlink resources and uplink resources.

26. The method of claim 25, wherein the set of downlink resources and uplink resources are identified by at least one of a group ID or a resource ID of a common beam whose beams use as resources with the same resource ID.

27. The method of claim 15, wherein: The signaling is provided via a wake-up signal (WUS); and The UE is configured to apply the update in one or more on durations following the WUS.

28. The method of claim 15, further comprising: receiving signaling from the UE indicating a capability of the UE to support the first update of the transmit beam and the second update of the receive beam according to one or more options; as well as Signaling indicating activation of one or more of the options is sent to the UE.

29. An apparatus for wireless communication by a relay node, comprising: Memory; as well as at least one processor coupled to the memory, the at least one processor configured to: receiving signaling from a network entity indicating a simultaneous update with a first update to a transmit beam used by a user equipment (UE) for uplink transmission and a second update to a receive beam used by the UE for downlink transmission; as well as The simultaneous updating is performed by applying the first update to the uplink transmission and applying the second update to the downlink transmission.

30. The apparatus of claim 29, wherein the at least one processor is further configured to perform the method of any one of claims 2-14.

31. An apparatus for wireless communication by a relay node, comprising: Memory; as well as at least one processor coupled to the memory, the at least one processor configured to: sending signaling to a user equipment (UE) indicating a simultaneous update with a first update to a transmit beam used by the UE for uplink transmission and a second update to a receive beam used by the UE for downlink transmission; as well as The simultaneous updating is performed by applying the first update to the uplink transmission and applying the second update to the downlink transmission.

32. The apparatus of claim 31 , wherein the at least one processor is further configured to perform the method of any one of claims 16-28.

Images