Sidelink unified transmission configuration indicator state

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a first user equipment (UE) can transmit an indication of at least one sidelink unified transmission configuration indicator (TCI) state to a second UE, where the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state, a separate forward link TCI state, or a separate reverse link TCI state. The first UE can communicate with the second UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink Unified TCI state. Numerous other aspects are described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. non-provisional patent application No. 17 / 932,061, filed on September 14, 2022, entitled "SIDELINKUNIFIEDTRANSMISSION CONFIGURATION INDICATOR STATE," which is hereby expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for applying a sidelink unified transmit configuration indicator (TCI) state. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless network may include one or more network nodes that support communications for wireless communication devices, such as user equipment (UE) or multiple UEs. The UE may communicate with the network nodes via downlink communications and uplink communications. A "downlink" (or "DL") refers to a communication link from a network node to a UE, and an "uplink" (or "UL") refers to a communication link from a UE to a network node. Some wireless networks may support device-to-device communications, such as via a local link (e.g., a sidelink (SL), a wireless local area network (WLAN) link, and / or a wireless personal area network (WPAN) link, etc.).

[0006] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a city, country, region and / or global level. New Radio (NR) (which may be referred to as 5G) is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by: improving spectrum efficiency; reducing costs; improving services; utilizing new spectrum; and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink, CP-OFDM and / or single carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink to better integrate with other open standards; and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR and other radio access technologies remain useful. Summary of the invention

[0007] Some aspects described herein relate to a first user equipment (UE) for wireless communication. The first UE may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to send an indication of at least one sidelink unified transmission configuration indicator (TCI) state to a second UE, wherein the at least one sidelink unified TCI state includes at least one of the following. The one or more processors may be configured to communicate with the second UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0008] Some aspects described herein relate to a second UE for wireless communication. The second UE may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to receive an indication of at least one sidelink unified TCI state from a first UE, wherein the at least one sidelink unified TCI state includes at least one of the following. The one or more processors may be configured to communicate with the first UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0009] Some aspects described herein relate to a method of wireless communication performed by a first UE. The method may include sending an indication of at least one sidelink unified TCI state to a second UE, wherein the at least one sidelink unified TCI state includes a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link. The method may include communicating with the second UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0010] Some aspects described herein relate to a method of wireless communication performed by a second UE. The method may include receiving an indication of at least one sidelink unified TCI state from a first UE, wherein the at least one sidelink unified TCI state includes a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link. The method may include communicating with the first UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0011] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a first UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to send an indication of at least one sidelink unified TCI state to a second UE, wherein the at least one sidelink unified TCI state includes at least one of the following. The instruction set, when executed by one or more processors of the UE, may cause the UE to communicate with the second UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0012] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a second UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive an indication of at least one sidelink unified TCI state from a first UE, wherein the at least one sidelink unified TCI state includes at least one of the following. The instruction set, when executed by one or more processors of the UE, may cause the UE to communicate with the first UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0013] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for sending an indication of at least one sidelink unified TCI state to a UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the apparatus and the UE and multiple sidelink channels on a reverse link between the apparatus and the UE, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link. The apparatus may include means for communicating with the UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0014] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include components for receiving an indication of at least one sidelink unified TCI state from a UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the UE and the apparatus and multiple sidelink channels on a reverse link between the UE and the apparatus, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link. The apparatus may include components for communicating with the UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state.

[0015] Aspects collectively include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, network entities, network nodes, wireless communication devices and / or processing systems as fully described herein with reference to the drawings and description and as illustrated in the drawings and description.

[0016] The features and technical advantages of the examples according to the present disclosure have been outlined quite extensively above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description, and not as a definition of the limitations of the claims.

[0017] Although various aspects are described in the present disclosure by illustrating some examples, it will be understood by those skilled in the art that such aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip implementations or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment and / or artificial intelligence devices). Various aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components and / or system-level components. The equipment incorporating the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components, including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders and / or summers). The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements and / or end-user devices of various sizes, shapes and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to fully understand the above-mentioned features of the present disclosure, a more specific description of the invention briefly summarized above can be obtained by referring to various aspects (some of which are illustrated in the accompanying drawings). However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit of other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0019] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0020] Figure 2 is a diagram illustrating an example of communication between a network node and a user equipment (UE) in a wireless network according to the present disclosure.

[0021] Figure 3 is a diagram illustrating an example of side link communication according to the present disclosure.

[0022] Figure 4 is a diagram illustrating an example of side link communication and access link communication according to the present disclosure.

[0023] Figure 5 is a diagram illustrating an example of using a beam for communication between a network node and a UE according to the present disclosure.

[0024] Figure 6 is a diagram illustrating an example of a sidelink transmission configuration indicator (TCI) medium access control (MAC) control element (MAC-CE) according to the present disclosure.

[0025] FIG. 7A to FIG. 7D and FIG. 8A to FIG. 8E is a diagram illustrating an example associated with an application side link unified TCI state according to the present disclosure.

[0026] Figures 9 and 10 is a diagram illustrating an example process associated with an application side link unified TCI state according to the present disclosure.

[0027] Fig.11 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0028] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. Instead, these aspects are provided so that the present disclosure will be thorough and complete, and the protection scope of the present disclosure will be fully conveyed to those skilled in the art. It should be appreciated by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functionality, or structures and functionality other than the various aspects of the disclosure set forth herein or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the present claim.

[0029] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0030] Although various aspects may be described herein using terms generally associated with 5G or new radio (NR) radio access technology (RAT), various aspects of the present disclosure may be applicable to other RATs, such as 3G RAT, 4G RAT and / or 5G and beyond (e.g., 6G) RATs.

[0031] Figure 1 1 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, or may include elements of a 5G (e.g., NR) network and / or elements of a 4G (e.g., Long Term Evolution (LTE)) network, etc. The wireless network 100 may include one or more network nodes 110 (shown as network node 110a, network node 110b, network node 110c, and network node 110d), user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other entities. The network node 110 is a network node that communicates with the UE 120. As shown in the figure, the network node 110 may include one or more network nodes. For example, the network node 110 may be a converged network node, meaning that the converged network node is configured to utilize a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node (e.g., within a single device or unit). As another example, the network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station), meaning that the network node 110 is configured to utilize a protocol stack that is physically or logically distributed between two or more nodes, such as one or more central units (CUs), one or more distributed units (DUs), or one or more radio units (RUs).

[0032] In some examples, the network node 110 is or includes a network node that communicates with the UE 120 via a radio access link, such as an RU. In some examples, the network node 110 is or includes a network node that communicates with other network nodes 110 via a fronthaul link or a midhaul link, such as a DU. In some examples, the network node 110 is or includes a network node that communicates with other network nodes 110 via a midhaul link or communicates with a core network via a backhaul link, such as a CU. In some examples, the network node 110 (such as an aggregated network node 110 or a decomposed network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. The network node 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, a transmit receive point (TRP), a DU, a RU, a CU, a mobility element of a network, a core network node, a network element, a network equipment, a RAN node, or a combination thereof. In some examples, network nodes 110 may be interconnected to each other or to one or more other network nodes 110 in wireless network 100 via various types of fronthaul, midhaul, and / or backhaul interfaces (such as direct physical connections, air interfaces, or virtual networks) using any suitable transport network.

[0033] In some examples, the network node 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP), the term "cell" may refer to the coverage area of ​​the network node 110 and / or the network node subsystem serving the coverage area, depending on the context in which the term is used. The network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by a UE 120 with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by a UE 120 associated with the femto cell (e.g., a UE 120 in a closed subscriber group (CSG)). A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. The network node 110 for a femto cell may be referred to as a femto network node or a home network node. Figure 1In the example shown, network node 110a may be a macro network node for macro cell 102a, network node 110b may be a pico network node for pico cell 102b, and network node 110c may be a femto network node for femto cell 102c. The network node may support one or more (e.g., three) cells. In some examples, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move according to the location of the mobile network node 110 (e.g., a mobile network node).

[0034] In some aspects, the term "base station" or "network node" may refer to a converged base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, or one or more components thereof. For example, in some aspects, a "base station" or "network node" may refer to a CU, a DU, a RU, a near real-time (near-RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network node" may refer to a device configured to perform one or more functions, such as those described herein in conjunction with the network node 110. In some aspects, the term "base station" or "network node" may refer to a plurality of devices configured to perform one or more functions. For example, in some distributed systems, each of a plurality of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to repeat the performance of at least a portion of the function, and the term "base station" or "network node" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one of the base station functions but not another base station function. In this way, a single device may include more than one base station.

[0035] The wireless network 100 may include one or more relay stations. A relay station is a network node that can receive transmissions of data from an upstream node (e.g., a network node 110 or a UE 120) and transmit transmissions of data to a downstream node (e.g., a UE 120 or a network node 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown, a network node 110d (e.g., a relay network node) may communicate with a network node 110a (e.g., a macro network node) and a UE 120d to facilitate communications between the network node 110a and the UE 120d. A network node 110 that relays communications may be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay, etc.

[0036] The wireless network 100 may be a heterogeneous network that includes different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, etc. These different types of network nodes 110 may have different transmit power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, a macro network node may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico network node, a femto network node, and a relay network node may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0037] The network controller 130 may be coupled to or in communication with a set of network nodes 110 and may provide coordination and control for the network nodes 110. The network controller 130 may communicate with the network nodes 110 via a backhaul communication link or a midhaul communication link. The network nodes 110 may also communicate directly with each other or indirectly via a wireless backhaul communication link or a wired backhaul communication link. In some aspects, the network controller 130 may be or may include a CU or a core network device.

[0038] UE 120 may be dispersed throughout the wireless network 100, and each UE 120 may be stationary or mobile. UE 120 may include, for example, an access terminal, a terminal, a mobile station, and / or a subscriber unit. UE 120 may be a cellular phone (e.g., 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, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, a UE function of a network node, and / or any other suitable device configured to communicate via a wireless or wired medium.

[0039] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors and / or location tags, which may communicate with a network node, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included in a housing that houses components of UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, the processor component (e.g., one or more processors) and the memory component (e.g., memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0040] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0041] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using network node 110 as an intermediary) using one or more side link channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by network node 110.

[0042] The devices of the wireless network 100 may communicate using an electromagnetic spectrum, which may be subdivided into various categories, bands, channels, etc., according to frequency or wavelength. For example, the devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency ranges designated FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz). It should be understood that although portions of FR1 are greater than 6 GHz, FR1 is often (interchangeably) referred to as the "below 6 GHz" band in various documents and articles. Similar naming issues sometimes occur with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0043] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The frequency bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and therefore the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, currently higher frequency bands are being explored to extend 5G NR operations to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6GHz to 71GHz), FR4 (52.6GHz to 114.25GHz) and FR5 (114.25GHz to 300GHz). Each of these higher frequency bands falls within the EHF band.

[0044] With the above examples in mind, unless otherwise expressly stated, it should be understood that if the term "below 6 GHz" or the like is used herein, the term may broadly refer to frequencies that may be below 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise expressly stated, it should be understood that if the term "millimeter wave" or the like is used herein, the term may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1 and / or FR5, or may be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0045] In some aspects, UE 120 may include communication manager 140. As described in more detail elsewhere herein, communication manager 140 may send an indication of at least one sidelink unified transmit configuration indicator (TCI) state to another UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the UE and the other UE and multiple sidelink channels on a reverse link between the first UE and the other UE, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link; and communicate with the other UE on at least one of a forward link or a reverse link based at least in part on the indication of the sidelink unified TCI state. Additionally or alternatively, communication manager 140 may perform one or more other operations described herein.

[0046] In some aspects, as described in more detail elsewhere herein, the communications manager 140 may receive an indication of at least one sidelink unified TCI state from another UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the other UE and the UE and multiple sidelink channels on a reverse link between the other UE and the UE, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link; and communicate with the other UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state. Additionally or alternatively, the communications manager 140 may perform one or more other operations described herein.

[0047] As indicated above, Figure 1 are provided as examples. Other examples can be found in the Figure 1 The examples described are different.

[0048] Figure 22 is a diagram illustrating an example 200 of a network node 110 communicating with a UE 120 in a wireless network 100 according to the present disclosure. The network node 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). The UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1). The network node 110 of example 200 includes one or more radio frequency components, such as an antenna 234 and a modem 254. In some examples, the network node 110 may include an interface, a communication component, or another component that facilitates communication with the UE 120 or another network node. Some network nodes 110 may not include a radio frequency component that facilitates direct communication with the UE 120, such as one or more CUs or one or more DUs.

[0049] At the network node 110, the transmit processor 220 may receive data intended for the UE 120 (or a set of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQI) received from the UE 120. The network node 110 may process (e.g., encode and modulate) the data for the UE 120 based at least in part on the MCS selected for the UE 120, and may provide data symbols for the UE 120. The transmit processor 220 may process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems) (shown as modems 232a to 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may further process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0050] At the UE 120, a set of antennas 252 (shown as antennas 252a to 252r) may receive downlink signals from the network node 110 and / or other network nodes 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) (shown as modems 254a to 254r). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the received signal to obtain input samples. Each modem 254 may use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from the modem 254, may perform MIMO detection on the received symbols where applicable, and may provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260, and may provide decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, among other things. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0051] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the network node 110 via the communication unit 294.

[0052] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included within one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, etc. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (in a single housing or multiple housings), sets of coplanar antenna elements, sets of non-coplanar antenna elements, and / or coupled to one or more transmit and / or receive components (such as antennas). Figure 2 One or more antenna elements of one or more components in.

[0053] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-decoded by the TX MIMO processor 266, where applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and sent to the network node 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform aspects of any of the methods described herein (eg, with reference to FIG. 7A to FIG. 7D , FIG. 8A to FIG. 8E and Figures 9 to 11 ).

[0054] At the network node 110, uplink signals from the UE 120 and / or other UEs may be received by the antenna 234, processed by the modem 232 (e.g., a demodulator component (shown as DEMOD) of the modem 232), detected by the MIMO detector 236 (where applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The network node 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network node 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink communication and / or uplink communication. In some examples, the modem 232 of the network node 110 may include a modulator and a demodulator. In some examples, the network node 110 includes a transceiver. The transceiver may include any combination of antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., see reference 242). FIG. 7A to FIG. 7D , FIG. 8A to FIG. 8E and Figures 9 to 11 ).

[0055] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components of the network node 110 may perform one or more techniques associated with applying the sidelink unified TCI state, as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Fig. 9 The process of 900 Fig.10 1000 and / or operations of other processes as described herein. Memory 242 and memory 282 may store data and program codes for network node 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium that stores one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed by one or more processors of network node 110 and / or UE 120 (e.g., directly executed, or executed after compilation, conversion, and / or interpretation), may cause the one or more processors, UE 120, and / or network node 110 to perform or direct, for example, Fig. 9 The process of 900 Fig.10 The process 1000 and / or operations of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, etc.

[0056] In some aspects, a first UE (e.g., UE 120) includes means for sending an indication of at least one sidelink unified TCI state to a second UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on the forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on the reverse link; and / or means for communicating with the second UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state. Means for the first UE to perform operations described herein may include, for example, one or more of the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0057] In some aspects, the second UE (e.g., UE 120) includes means for receiving an indication of at least one sidelink unified TCI state from the first UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on the forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on the reverse link; and / or means for communicating with the first UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state. Means for the second UE to perform operations described herein may include, for example, one or more of the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0058] Although Figure 2 The blocks in the 200 and 210 are illustrated as distinct components, but the functionality described above for these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described for the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0059] As indicated above, Figure 2 are provided as examples. Other examples can be found in the Figure 2 The examples described are different.

[0060] The deployment of a communication system (such as a 5G NR system) can be arranged in a variety of ways using various components or constituent parts. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a RAN node, a core network node, a network element, a base station or network equipment can be implemented in an aggregated or decomposed architecture. For example, a base station (such as a node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a TRP or a cell, etc.) or one or more units (or one or more components) performing base station functionality can be implemented as an aggregated base station (also referred to as an independent base station or a monolithic base station) or a decomposed base station. "Network entity" or "network node" may refer to a decomposed base station or one or more units of a decomposed base station (such as one or more CUs, one or more DUs, one or more RUs or a combination thereof).

[0061] An aggregated base station (e.g., an aggregated network node) may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). A decomposed base station (e.g., a decomposed network node) may be configured to utilize a protocol stack that is physically or logically distributed between two or more units (such as one or more CUs, one or more DUs, or one or more RUs). In some examples, a CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed across one or more other network nodes. A DU may be implemented to communicate with one or more RUs. Each of a CU, a DU, and a RU may also be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), and the like.

[0062] Base station type operations or network designs may take into account the aggregated nature of base station functionality. For example, a decomposed base station may be utilized in an IAB network, an open radio access network (O-RAN (such as a network configuration initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate the scaling of a communication system by separating base station functionality into one or more units that can be deployed independently. A decomposed base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented virtually for at least one unit, which may enable flexibility in network design. Individual units of the decomposed base station may be configured for wired or wireless communication with at least one other unit of the decomposed base station.

[0063] Figure 3 is a diagram illustrating an example 300 of sidelink communications according to the present disclosure.

[0064] like Figure 3As shown in , the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more side link channels 310. UEs 305-1 and 305-2 can communicate using one or more side link channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication and / or V2P communication) and / or mesh networks. In some aspects, UE 305 (e.g., UE 305-1 and / or UE 305-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, one or more side link channels 310 may use a PC5 interface and / or may operate in a high frequency band (e.g., a 5.9 GHz band). Additionally or alternatively, UE 305 may use global navigation satellite system (GNSS) timing to synchronize the timing of a transmit time interval (TTI) (e.g., a frame, subframe, time slot, or symbol).

[0065] like Figure 3 As further shown, the one or more sidelink channels 310 may include a physical sidelink control channel (PSCCH) 315, a physical sidelink shared channel (PSSCH) 320, and / or a physical sidelink feedback channel (PSFCH) 325. The PSCCH 315 may be used to communicate control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communication with the network node 110 via an access link or access channel. The PSSCH 320 may be used to communicate data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communication with the network node 110 via an access link or access channel. For example, the PSCCH 315 may carry sidelink control information (SCI) 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, and / or space resources), wherein a transport block (TB) 335 may be carried on the PSSCH 320. The TB 335 may include data. The PSFCH 325 may be used to communicate sidelink feedback 340, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement (ACK) or negative acknowledgement (NACK) (ACK / NACK) information), transmit power control (TPC), and / or scheduling request (SR).

[0066] Although shown on PSCCH 315, in some aspects, SCI 330 may include multiple communications in different levels, such as a first level SCI (SCI-1) and a second level SCI (SCI-2). SCI-1 may be sent on PSCCH 315. SCI-2 may be sent on PSSCH 320. SCI-1 may include, for example, an indication of one or more resources (e.g., time resources, frequency resources, and / or space resources) on PSSCH 320, information for decoding sidelink communications on PSSCH, a quality of service (QoS) priority value, a resource reservation period, a PSSCH DMRS pattern, an SCI format for SCI-2, a beta offset for SCI-2, a number of PSSCH DMRS ports, and / or an MCS. SCI-2 may include information associated with data transmission on PSSCH 320, such as a HARQ process identifier (ID), a new data indicator (NDI), a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.

[0067] In some aspects, one or more sidelink channels 310 may use a resource pool. For example, a scheduling assignment (e.g., included in SCI 330) may be sent in a subchannel across time using specific resource blocks (RBs). In some aspects, data transmissions associated with a scheduling assignment (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and the associated data transmission are not sent on adjacent RBs.

[0068] In some aspects, the UE 305 may operate using a sidelink resource allocation mode (e.g., Mode 1) in which resource selection and / or scheduling is performed by a network node 110 (e.g., a base station, CU, or DU). For example, the UE 305 may receive a grant for sidelink channel access and / or scheduling from the network node 110 (e.g., directly or via one or more network nodes) (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as a grant for configuration). In some aspects, the UE 305 may operate using a resource allocation mode (e.g., Mode 2) in which resource selection and / or scheduling is performed by the UE 305 (e.g., instead of the network node 110). In some aspects, the UE 305 may perform resource selection and / or scheduling by sensing channel availability for transmission. For example, UE 305 may measure RS SI parameters associated with various side link channels (e.g., sidelink-RSSI (S-RSSI) parameters), may measure RSRP parameters associated with various side link channels (e.g., PSSCH-RSRP parameters), and / or may measure RSRQ parameters associated with various side link channels (e.g., PSSCH-RSRQ parameters), and may select a channel for sending side link communications based at least in part on the measurement results.

[0069] Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling using the SCI 330 received in the PSCCH 315, which may indicate occupied resources and / or channel parameters. Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling by determining a channel busy rate (CBR) associated with each sidelink channel, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 305 may use for a particular set of subframes).

[0070] In a transmission mode where resource selection and / or scheduling is performed by the UE 305, the UE 305 may generate a sidelink grant and may transmit the grant in the SCI 330. The sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks (e.g., for TB 335) to be used for an upcoming sidelink transmission on the PSSCH 320, one or more subframes to be used for an upcoming sidelink transmission, and / or an MCS to be used for an upcoming sidelink transmission. In some aspects, the UE 305 may generate a sidelink grant that indicates one or more parameters (such as the periodicity of the sidelink transmission) for semi-persistent scheduling (SPS). Additionally or alternatively, the UE 305 may generate a sidelink grant for event-driven scheduling (such as for an on-demand sidelink message).

[0071] As indicated above, Figure 3 are provided as examples. Other examples can be found in the Figure 3 The examples described are different.

[0072] Figure 4 is a diagram illustrating an example 400 of side link communications and access link communications according to the present disclosure.

[0073] like Figure 4 As shown, the transmitter (Tx) / receiver (Rx) UE 405 and the Rx / Tx UE 410 can communicate with each other via a side link, as described above in conjunction with Figure 3 As further shown in the figure, in some sidelink modes, the network node 110 may communicate with the Tx / Rx UE 405 (e.g., directly or via one or more network nodes), such as via a first access link. Additionally or alternatively, in some sidelink modes, the network node 110 may communicate with the Rx / Tx UE 410 (e.g., directly or via one or more network nodes), such as via a first access link. The Tx / Rx UE 405 and / or the Rx / Tx UE 410 may correspond to one or more UEs described elsewhere herein, such as Figure 1 120. Thus, a direct link between UEs 120 (e.g., via a PC5 interface) may be referred to as a side link, and a direct link between network 110 and UE 120 (e.g., via a Uu interface) may be referred to as an access link. Side link communications may be sent via a side link, and access link communications may be sent via an access link. Access link communications may be downlink communications (from network node 110 to UE 120) or uplink communications (from UE 120 to network node 110).

[0074] As indicated above, Figure 4 are provided as examples. Other examples can be found in the Figure 4 The examples described are different.

[0075] Figure 5 5 is a diagram illustrating an example 500 of using beams for communication between a network node and a UE according to the present disclosure. Figure 5 As shown, network node 110 and UE 120 may communicate with each other.

[0076] The network node 110 may transmit to a UE 120 located within the coverage area of ​​the network node 110. The network node 110 and the UE 120 may be configured for beamformed communication, wherein the network node 110 may transmit in the direction of the UE 120 using a directional network node (NN) transmit beam (e.g., a base station (BS) transmit beam), and the UE 120 may receive the transmission using a directional UE receive beam. Each NN transmit beam may have an associated beam ID, beam direction, or beam symbol, etc. The network node 110 may transmit downlink communications via one or more NN transmit beams 505.

[0077] UE 120 may attempt to receive downlink transmissions via one or more UE receive beams 510, which may be configured using different beamforming parameters at the receive circuitry of UE 120. UE 120 may identify a specific NN transmit beam 505 (shown as NN transmit beam 505-A) and a specific UE receive beam 510 (shown as UE receive beam 510-A) that provide relatively good performance (e.g., having the best channel quality of different measured combinations of NN transmit beams 505 and UE receive beams 510). In some examples, UE 120 may send an indication of which NN transmit beam 505 UE 120 identifies as a preferred NN transmit beam, and network node 110 may select the preferred NN transmit beam to transmit to UE 120. Thus, UE 120 can obtain and maintain a beam pair link (BPL) for downlink communication with network node 110 (e.g., a combination of NN transmit beam 505-A and UE receive beam 510-A), which can be further refined and maintained according to one or more established beam refinement procedures.

[0078] A downlink beam (such as a NN transmit beam 505 or a UE receive beam 510) may be associated with a TCI state. The TCI state may indicate a directionality or characteristic of the downlink beam, such as one or more quasi-co-location (QCL) attributes of the downlink beam. The QCL attributes may include, for example, Doppler shift, Doppler spread, average delay, delay spread, or spatial reception parameters, etc. In some examples, each NN transmit beam 505 may be associated with a synchronization signal block (SSB), and the UE 120 may indicate a preferred NN transmit beam 505 by transmitting an uplink transmission in the resources of the SSB associated with the preferred NN transmit beam 505. A specific SSB may have an associated TCI state (e.g., for an antenna port or for beamforming). In some examples, the network node 110 may indicate a downlink NN transmit beam 505 based at least in part on an antenna port QCL attribute that may be indicated by the TCI state. For different QCL types (e.g., QCL types for different combinations of Doppler shift, Doppler spread, average delay, delay spread, or spatial reception parameters, etc.), the TCI state may be associated with a set of downlink reference signals (e.g., SSB and aperiodic, periodic, or semi-persistent CSI reference signals (CSI-RS)). In the case where the QCL type indicates spatial reception parameters, the QCL type may correspond to simulated receive beamforming parameters of the UE receive beam 510 at the UE 120. Thus, the UE 120 may select a corresponding UE receive beam 510 from the BPL set based at least in part on the network node 110 indicating the NN transmit beam 505 via the TCI indication.

[0079] In some examples, the network node 110 may maintain an activated TCI state set for downlink shared channel transmission and an activated TCI state set for downlink control channel transmission. The activated TCI state set for downlink shared channel transmission may correspond to a beam that the network node 110 uses for downlink transmission on PDSCH. The activated TCI state set for downlink control channel communication may correspond to a beam that the network node 110 can use for downlink transmission on PDCCH or in a control resource set (CORESET). The UE 120 may also maintain the activated TCI state set for receiving downlink shared channel transmission and CORESET transmission. In the case of activating TCI states for UE 120, UE 120 may have one or more antenna configurations based at least in part on the TCI states, and UE 120 may not need to reconfigure antennas or antenna weighting configurations. In some examples, the set of activated TCI states (e.g., activated PDSCH TCI states and activated CORESET TCI states) for UE 120 may be configured by a configuration message (such as an RRC message).

[0080] Similarly, for uplink communications, UE 120 may transmit in the direction of network node 110 using a directional UE transmit beam, and network node 110 may receive the transmission using a directional NN receive beam. Each UE transmit beam may have an associated beam ID, beam direction, or beam symbol, etc. UE 120 may transmit uplink communications via one or more UE transmit beams 515.

[0081] The network node 110 may receive uplink transmissions via one or more NN receive beams 520 (e.g., BS receive beams). The network node 110 may identify a specific UE transmit beam 515 (shown as UE transmit beam 515-A) and a specific NN receive beam 520 (shown as NN receive beam 520-A) that provide relatively good performance (e.g., having the best channel quality of different measured combinations of UE transmit beams 515 and NN receive beams 520). In some examples, the network node 110 may send an indication of which UE transmit beam 515 the network node 110 identifies as a preferred UE transmit beam, and the network node 110 may select the preferred UE transmit beam to transmit from the UE 120. Thus, UE 120 and network node 110 may obtain and maintain a BPL for uplink communications (e.g., a combination of UE transmit beam 515-A and NN receive beam 520-A), which may be further refined and maintained according to one or more established beam refinement procedures. In some examples, an uplink beam (such as UE transmit beam 515 or NN receive beam 520) may be associated with a spatial relationship. The spatial relationship may indicate a directionality or characteristic of the uplink beam (similar to one or more QCL attributes), as described above.

[0082] In some examples, the network node 110 and the UE 120 may use a unified TCI framework for both downlink and uplink beam indications. "Unified TCI" (also referred to as "shared unified TCI") refers to a TCI that indicates a TCI state applicable to multiple channels (e.g., a "unified TCI state" or a "shared unified TCI state"). For example, the unified TCI state may be applicable to at least a UE-specific PDCCH and PDSCH and / or a PUSCH and a UE-specific PUCCH. In the unified TCI framework, for communications between the network node 110 and the UE 120, a unified TCI state indication may be used to indicate a joint downlink and uplink TCI state or to indicate separate downlink and uplink TCI states. The unified TCI state indication of the joint uplink and downlink TCI state may be used to indicate beam directions for downlink channels (e.g., PDSCH and PDCCH) or reference signals (e.g., CSI-RS) and for uplink channels (e.g., PUSCH and PUCCH) or reference signals (e.g., sounding reference signals (SRS)). A unified TCI state indication for a separate downlink TCI state may be used to indicate beam directions for multiple downlink channels (e.g., PDSCH and PDCCH) or reference signals (e.g., CSI-RS). A unified TCI state indication for a separate uplink TCI state may be used to indicate beam directions to be used for multiple uplink channels (e.g., PUSCH and PUCCH) or reference signals (e.g., SRS). In some examples, the unified TCI state indication may be "sticky" such that the indicated beam direction will be used for the channel and / or reference signal to which the TCI state indication applies until another indication is received. In this way, the unified TCI state indication may be applicable to multiple communications (e.g., downlink and / or uplink communications) on multiple channels.

[0083] In some examples, there may be two TCI state indication modes in a unified TCI state framework for downlink and uplink communications. The first mode may be a separate downlink and uplink TCI state indication mode, in which separate downlink and uplink TCI states are used to indicate downlink and uplink beam directions for UE 120. For example, when UE 120 has a maximum allowed exposure (MPE) problem, separate downlink and uplink TCI state indication modes may be used to indicate different beam directions for UE 120, for uplink beams (e.g., UE Tx beams) and downlink beams (e.g., UE Rx beams). The second mode may be a joint downlink and uplink TCI state indication mode, in which TCI state indications are used to indicate joint uplink and downlink beam directions to UE 120. For example, a joint downlink and uplink TCI state indication mode may be used when UE 120 has channel correspondence between downlink and uplink channels (which may be assumed in some examples), and the same beam direction may be used for both the uplink beam (e.g., UE Tx beam) and the downlink beam (e.g., UE Rx beam).

[0084] As indicated above, Figure 5 are provided as examples. Other examples can be found in the Figure 5 The examples described are different.

[0085] Figure 6 is a diagram illustrating an example 600 of a sidelink TCI medium access control (MAC) control element (MAC-CE) according to the present disclosure.

[0086] In some examples, a TCI state indication may be used to indicate a sidelink beam for sidelink communication between a first UE and a second UE. For example, a first UE may send a PC5 RRC message to a second UE that configures a list of sidelink TCI states using a corresponding source sidelink reference signal that provides a QCL characteristic for the sidelink TCI state. In this case, the configuration of each sidelink TCI state may be extended to indicate whether the corresponding source reference signal is a transmitted reference signal or a received reference signal compared to the configuration of the downlink TCI state. A first UE may send a sidelink TCI MAC-CE for beam indication (e.g., by indicating a sidelink TCI state to be used for sidelink communication) or for activation or deactivation of one or more TCI states to a second UE. For example, a sidelink TCI MAC-CE may indicate an activated TCI state set, and a first UE may indicate a TCI code point in a TCI field in an SCI-2 sent to a second UE that indicates a sidelink TCI state for sidelink communication.

[0087] like Figure 6 As shown, the sidelink TCI MAC-CE may indicate a serving cell ID indicating a serving cell and a BWP portion ID indicating a sidelink bandwidth (BWP). The sidelink TCI MAC-CE may indicate two target sidelink channels (e.g., a first target sidelink channel and a second target sidelink channel), for which the activated sidelink TCI is indicated in the sidelink TCI MAC-CE. The sidelink TCI MAC-CE may include a first channel ID field indicating whether the first target sidelink is PSCCH, PSSCH, or PSFCH, and a second channel ID field indicating whether the second target sidelink is PSCCH, PSSCH, or PSFCH. The sidelink TCI MAC-CE may include a corresponding Tx / Rx field associated with each of the first channel ID field and the second channel ID field. The Tx / Rx field may include a bit indicating whether the target sidelink channel indicated in the associated channel ID field is to be received or transmitted by the second UE. The sidelink TCI MAC-CE may indicate N pairs of activated sidelink TCI states (e.g., TCI state ID 0,1 、TCI Status ID 0,2 ,...,TCI status ID N，1 、TCI Status ID N,2 ). In each pair of activated sidelink TCI states, the TCI state ID x，1 Indicates the sidelink TCI state for the first target sidelink channel, and the TCI state ID x，2 Indicates the sidelink TCI state for the second target sidelink channel. Each of the N pairs of activated TCI states can be mapped to a corresponding TCI code point that can be indicated in the SCI (or in the DCI received from the network node). In this way, one TCI code point indicated in the TCI field of SCI-2 can indicate the corresponding TCI state for two target sidelink channels.

[0088] As indicated above, Figure 6 are provided as examples. Other examples can be found in the Figure 6 The examples described are different.

[0089] In combination with the above Figure 6In the sidelink TCI framework described, although one TCI code point can be used to indicate the corresponding TCI state for two sidelink channels, a separate TCI state must be indicated for each sidelink communication on each sidelink channel. However, in sidelink communications, the PSCCH and PSSCH can be in the same subchannel, and the PSSCH can be mapped to a specific PSFCH. Therefore, the same TCI state may be used for all sidelink channels. Therefore, a sidelink unified TCI state applicable to multiple sidelink channels can provide the benefit of reducing the signaling overhead for indicating the beam used for sidelink communications.

[0090] Some techniques and devices described herein enable a first UE to send an indication of at least one sidelink unified TCI state to a second UE. At least one sidelink unified TCI state may include a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on a forward link, or at least one of a separate reverse link TCI state applicable to multiple sidelink channels on a reverse link. The first UE may communicate with the second UE on at least one of a forward link or a reverse link based at least in part on an indication of the sidelink unified TCI state. Therefore, the signaling overhead for indicating a beam for sidelink communication can be reduced.

[0091] FIG. 7A to FIG. 7D is a diagram illustrating an example 700 associated with an application side link unified TCI state according to the present disclosure. Fig. 7A As shown, example 700 includes communication between a first UE 120-1 and a second UE 120-2. In some aspects, the first UE 120-1 and the second UE 120-2 may be included in a wireless network such as the wireless network 100. The first UE 120-1 and the second UE 120-2 may communicate via sidelink communication (e.g., via a PC5 interface).

[0092] like Fig. 7AAnd as shown by reference numeral 705, the first UE 120-1 may send a sidelink unified TCI state indication, and the second UE 120-2 may receive a sidelink unified TCI state indication. The sidelink unified TCI state indication may be an indication of a sidelink unified TCI state applicable to a plurality of sidelink channels on a forward link and / or between the first UE 120-1 and the second UE 120-2 and / or a plurality of sidelink channels on a reverse link between the first UE 120-1 and the second UE 120-2. The sidelink unified TCI (or the sidelink unified TCI state) may also be referred to herein as "sidelink shared unified TCI" (or "sidelink shared unified TCI state"). In some aspects, the sidelink unified TCI state indication may indicate a joint TCI state applicable to a forward link and a reverse link. In some aspects, the sidelink unified TCI state indication may indicate a separate forward link TCI state applicable to a forward link and / or a separate reverse link TCI state applicable to a reverse link. In some aspects, the sidelink TCI state indication may be included in the SCI. For example, the sidelink TCI status indication may be a TCI code point included in a TCI field in an SCI-2. In some aspects, the sidelink TCI status indication may be included in a MAC-CE (eg, a PC5 MAC-CE).

[0093] The directions of the forward link and the reverse link may be defined from the perspective of a UE (e.g., first UE 120-1) that transmits the sidelink unified TCI state indication. For example, the forward link may be associated with a sidelink transmission (e.g., PSCCH and PSSCH transmission) from the first UE 120-1 to the second UE 120-2, and the reverse link may be associated with a sidelink transmission (e.g., PSCCH and PSSCH transmission) from the second UE 120-2 to the first UE 120-1. Figure 7B A first option (Option 1) for defining sidelink channels for the forward link and the reverse link is shown, and Figure 7C A second option (Option 2) is shown for defining sidelink channels for the forward link and reverse link.

[0094] like Figure 7BAnd as indicated by reference numeral 710, in Option 1, the sidelink channels of the forward link (FL) include a PSCCH transmitted from the first UE 120-1 to the second UE 120-2, a PSSCH transmitted from the first UE 120-1 to the second UE 120-2, and a PSFCH transmitted from the first UE 120-1 to the second UE 120-2. As indicated by reference numeral 715, in Option 1, the sidelink channels of the reverse link (RL) include a PSCCH transmitted from the second UE 120-2 to the first UE 120-1, a PSSCH transmitted from the second UE 120-2 to the first UE 120-1, and a PSFCH transmitted from the second UE 120-2 to the first UE 120-1. That is, in some aspects (e.g., in Option 1), the forward link may include all sidelink channels sent in a direction from the first UE 120-1 to the second UE 120-2, and the reverse link may include all sidelink channels sent in a direction from the second UE 120-2 to the first UE 120-1. In this case, the sidelink unified TCI status indication applicable to the forward link (e.g., a joint forward link and reverse link TCI status indication or a separate forward link TCI status indication) applies to the PSCCH, PSSCH, and PSFCH sent from the first UE 120-1 to the second UE 120-2, and the sidelink unified TCI status indication applicable to the reverse link (e.g., a joint forward link and reverse link TCI status indication or a separate reverse link TCI status indication) applies to the PSCCH, PSSCH, and PSFCH sent from the second UE 120-2 to the first UE 120-1. In some aspects, in Option 1, when separate forward link and reverse link TCI states are used, a sidelink unified TCI state indication may be required to indicate both the separate forward link TCI state and the separate reverse link TCI state.

[0095] like Figure 7CAnd as indicated by reference numeral 720, in Option 2, the sidelink channels of the forward link include a PSCCH transmitted from the first UE 120-1 to the second UE 120-2, a PSSCH transmitted from the first UE 120-1 to the second UE 120-2, and a PSFCH transmitted from the second UE 120-2 to the first UE 120-1. As indicated by reference numeral 725, in Option 2, the sidelink channels of the reverse link include a PSCCH transmitted from the second UE 120-2 to the first UE 120-1, a PSSCH transmitted from the second UE 120-2 to the first UE 120-1, and a PSFCH transmitted from the first UE 120-1 to the second UE 120-2. That is, in some aspects (e.g., in Option 2), the forward link may include a sidelink channel in which the first UE 120-1 transmits PSCCH and PSSCH communications to the second UE 120-2 and a sidelink channel in which the first UE 120-1 receives PSFCH feedback associated with the PSSCH communications transmitted to the second UE 120-2 from the second UE 120-2. Similarly, the reverse link may include a sidelink channel in which the second UE 120-2 transmits PSCCH and PSSCH communications to the first UE 120-1 and a sidelink channel in which the second UE 120-2 receives PSFCH feedback associated with the PSSCH communications transmitted to the first UE 120-1 from the first UE 120-1. In some aspects, Option 2 may be used in the case in which the first UE 120-1 transmits unidirectional sidelink traffic to the second UE 120-2. In this case, there will be no PSFCH feedback sent from the first UE 120-1 to the second UE 120-2, and the sidelink unified TCI status indication indicating a separate forward link TCI status indication may be applicable to the PSCCH and PSSCH used to send unidirectional services from the first UE 120-1 to the second UE 120-2 and the PSFCH used to send sidelink feedback (for unidirectional services) from the second UE 120-2 to the first UE 120-1.

[0096] Fig.7D The applicable source reference signal and applicable target sidelink channel for each type of sidelink unified TCI are shown. Fig.7DAnd as shown by reference numeral 730, the type of sidelink unified TCI may include joint forward link and reverse link (joint FL / RL) TCI, separate forward link TCI and separate reverse link TCI. As shown by reference numeral 735, for each type of sidelink unified TCI, the source reference signal that determines one or more QCL characteristics may be a sidelink SSB or a sidelink CSI-RS. As shown by reference numeral 740, the applicable target channel for the joint forward link and reverse link TCI may include PSCCH, PSSCH and PSFCH on both the forward link and the reverse link (e.g., according to option 1 or option 2). As further shown by reference numeral 740, the applicable target channel for the separate forward link TCI may include PSCCH, PSSCH and PSFCH on the forward link (e.g., according to option 1 or option 2). As further shown by reference numeral 740, the applicable target channel for the separate reverse link TCI may include PSCCH, PSSCH and PSFCH on the reverse link (e.g., according to option 1 or option 2).

[0097] As indicated above, FIG. 7A to FIG. 7D are provided as examples. Other examples can be found in the FIG. 7A to FIG. 7D Different than described.

[0098] FIG. 8A to FIG. 8E 8 is a diagram illustrating an example 800 associated with an application side link unified TCI state according to the present disclosure. Fig. 8A As shown, example 800 includes communication between a first UE 120-1 and a second UE 120-2. In some aspects, the first UE 120-1 and the second UE 120-2 may be included in a wireless network such as the wireless network 100. The first UE 120-1 and the second UE 120-2 may communicate via sidelink communication (e.g., via a PC5 interface).

[0099] like Fig. 8AAnd shown by reference numeral 805, the first UE 120-1 can send the configuration of one or more side link unified TCI state pools, and the second UE 120-2 can receive the configuration.For example, the first UE 120-1 can send configuration to the second UE 120-2 in the PC5 RRC message.The configuration can define the joint and forward link TCI state pool and reverse link TCI state pool.Joint and forward link TCI state pool can indicate the corresponding TCI state ID and the corresponding source reference signal for the unified TCI state of multiple side links to be used for joint forward link and reverse link TCI state or independent forward link TCI state.Reverse link TCI state pool can indicate the corresponding TCI state ID and the corresponding source reference signal for the unified TCI state of multiple side links to be used for independent reverse link TCI state.In some aspects, the configuration may include the unified TCI state pool (for example, the first side link unified TCI state pool and the second side link unified TCI state pool) for joint and forward link TCI state pool and reverse link TCI state pool. In some aspects, the configuration may include a sidelink unified TCI state pool that includes a joint and forward link TCI state pool and a reverse link TCI state pool.

[0100] In some aspects, the configuration may include an indication of a sidelink unified TCI state type (e.g., sl-unifiedtci-state-type) indicating whether a separate forward link TCI state and a separate reverse link TCI state or a joint forward link and reverse link TCI state is to be used for sidelink communication between the first UE 120-1 and the second UE 120-2. For example, the indication of the sidelink unified TCI state type (e.g., sl-unifiedtci-state-type) may be enumerated as {slSeperateFLRL, slJoinFLRL} to indicate whether the sidelink unified TCI state type configured for sidelink communication is a separate forward link and reverse link TCI state or a joint forward link and reverse link TCI state.

[0101] like Fig. 8AAs further shown by reference numeral 810, the first UE 120-1 may send a sidelink unified TCI state activation MAC-CE and the second UE 120-2 may receive the sidelink unified TCI state activation MAC-CE. The sidelink unified TCI state activation MAC-CE may be a PC5 MAC-CE indicating an activated sidelink unified TCI state set for the first UE 120-1 and the second UE 120-2. The sidelink activation MAC-CE may also be used to deactivate a previously activated sidelink unified TCI state and may also be referred to as a sidelink unified TCI state deactivation MAC-CE or a sidelink unified TCI state activation / deactivation MAC-CE.

[0102] Figure 8B An example of activating MAC-CE in the unified TCI state of the side link is shown. Figure 8B As shown, the sidelink unified TCI state activation MAC-CE may include a serving cell ID field 840 indicating a serving cell for sidelink communication, a forward link BWP ID field 842 indicating a sidelink BWP for a forward link, and a reverse link BWP ID field 844 indicating a sidelink BWP for a reverse link. For example, the first octet (Oct 1) of the sidelink unified TCI state activation MAC-CE may include the serving cell ID field 840 and the forward link BWP ID field 842, and the second octet (Oct 2) may include the reverse link BWP ID field 844. The sidelink unified TCI state activation MAC-CE may include a corresponding P field for each TCI code point value in the TCI code point value set. i Field 846. For example, the third octet (Oct 3) may include 8 one-bit P bits corresponding to eight TCI code point values ​​(e.g., 000, 001, ..., 111). i Field 846 (P1-P8). Each P i Field 846 may indicate whether the corresponding TCI code point value maps to a single sidelink unified TCI state or multiple (eg, 2) sidelink unified TCI states. i The first value (e.g., 0) in field 846 may indicate that the corresponding TCI code point value indicates / maps to a single sidelink unified TCI state (e.g., a joint forward link and reverse link TCI state, a separate forward link TCI state, or a separate reverse link TCI state), and P i A second value (eg, 1) in field 846 may indicate that the corresponding TCI code point value indicates / maps to two sidelink unified TCI states (eg, a separate forward link TCI state and a separate reverse link TCI state).

[0103] The sidelink unified TCI state activation MAC-CE may indicate a list of activated sidelink unified TCI states among a plurality of sidelink unified TCI states included in one or more sidelink unified TCI state pools. Figure 8B As shown, for each of the N activated sidelink unified TCI states, the sidelink unified TCI state activation MAC-CE may include a corresponding TCI state ID field 848 indicating a TCI state ID identifying the activated sidelink unified TCI state. For example, the TCI state ID may indicate an activated sidelink unified TCI state from one or more sidelink unified TCI state pools in the configuration. In some aspects, the sidelink unified TCI state activation MAC-CE may include a corresponding F / R field 850 associated with each TCI state ID field 848. For example, for each TCI state ID field 848, the corresponding F / R field 850 may be a one-bit indication included in the same aspect as the corresponding TCI state ID 848. The F / R field 850 may indicate whether the TCI state ID indicated in the corresponding TCI state ID field 848 (e.g., the TCI state ID field 848 in the same octet) is for a joint or forward link TCI state or a reverse link TCI state. For example, a first value (e.g., 0) in the F / R field 850 may indicate that the TCI state ID indicated in the corresponding TCI state ID field 848 maps to the joint and forward link TCI state pool, and a second value (e.g., 1) in the F / R field 850 may indicate that the TCI state ID indicated in the corresponding TCI state ID field 848 maps to the reverse link TCI state pool. In some aspects, the N activated sidelink unified TCI states indicated in the N TCI state ID fields 848 (e.g., included in the N corresponding octets of the sidelink unified TCI state activation MAC-CE) may include one or more (e.g., 1 or 2) activated sidelink unified TCI states for each TCI code point value. For example, each TCI code point value may be based on the corresponding P for that TCI code point value. i The value indicated in field 846 maps to one TCI State ID field 848 or two TCI State ID fields.

[0104] return Fig. 8AAs shown by reference numeral 815, the second UE 120-2 may send sidelink feedback related to the sidelink unified TCI state activation MAC-CE, and the first UE 120-1 may receive the sidelink feedback. The second UE 120-2 may send sidelink feedback (e.g., in PSFCH communication) indicating an ACK or NACK related to receiving a sidelink communication (e.g., PSSCH communication) including the sidelink unified TCI state activation MAC-CE. For example, the second UE 120-2 may send a PSFCH ACK related to successfully decoding the sidelink communication (e.g., PSSCH communication) including the sidelink unified TCI state activation MAC-CE, or the second UE 120-2 may send a PSFCH NACK related to unsuccessfully decoding the sidelink communication (e.g., PSSCH communication) including the sidelink unified TCI state activation MAC-CE.

[0105] In some aspects, the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE may be activated at an application time after a duration (e.g., application duration) from when second UE 120-2 sends ACK feedback (e.g., PSFCH ACK) related to the sidelink unified TCI state activation MAC-CE and first UE 120-1 receives the ACK feedback. Figure 8C And as shown by reference numeral 860, the first UE 120-1 may send a PSSCH communication including a sidelink unified TCI state activation MAC-CE to the second UE 120-2. As shown by reference numeral 862, the second UE 120-2 may send a PSFCH ACK related to receiving a PSSCH communication including a sidelink unified TCI state activation MAC-CE to the first UE 120-1. As shown by reference numeral 864, the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE may be activated at an application time after the application duration from the end of the timeslot in which the PSFCH ACK is sent. For example, the application duration of the MAC-CE-based sidelink unified TCI state activation may be 3ms. In some aspects, a previously activated sidelink unified TCI state not indicated in the sidelink unified TCI state activation MAC-CE may be deactivated at the application time for the sidelink unified TCI state activation MAC-CE.

[0106] return Fig. 8A, as shown by reference numeral 820, the first UE 120-1 may send an SCI, and the second UE 120-2 may receive the SCI, the SCI including an indication of at least one sidelink unified TCI state. For example, the indication of at least one sidelink unified TCI state may be included in an SCI-2 (e.g., in a TCI field in SCI-2), which is sent to the second UE 120-2 in a PSSCH communication. In some aspects, the indication of at least one sidelink unified TCI state may be an indication of a TCI code point indicating at least one activated sidelink unified TCI state in an activated sidelink unified TCI state set indicated in a sidelink unified TCI state activation MAC-CE. For example, the TCI code point value may be based at least in part on a corresponding P associated with the TCI code point value indicated in the SCI. i Field 846 may be used to indicate one activated sidelink unified TCI state (e.g., a joint forward link and reverse link TCI state, a separate forward link TCI state, or a separate reverse link TCI state) or two activated sidelink unified TCI states (e.g., a separate forward link TCI state and a separate reverse link TCI state). The type of each sidelink unified TCI state indicated by a TCI code point may be indicated by a corresponding F / R field 850 in the sidelink unified TCI state activation MAC-CE and / or by a configured sidelink unified TCI state type (e.g., sl-unifiedTCI-state-type) indicated in the configuration.

[0107] As indicated by reference numeral 825, the second UE 120-2 may send sidelink feedback related to a sidelink communication (e.g., a PSSCH communication) including an SCI-2, and the first UE 120-1 may receive the sidelink feedback. For example, the second UE 120-2 may send sidelink feedback indicating an ACK related to successfully decoding a PSSCH communication including SCI-2 or a NACK related to unsuccessfully decoding a PSSCH communication including SCI-2 (e.g., in a PSFCH communication).

[0108] There may not be a dedicated ACK feedback for SCI, and different situations of PSFCH feedback may provide an implicit indication of whether the second UE 120-2 successfully receives the sidelink unified TCI status indication included in SCI-2. In the case where SCI-1 is not decoded by the second UE 120-2, the second UE 120-2 may not transmit any PSFCH feedback to the first UE 120-1. In this case, the second UE 120-2 does not receive the sidelink unified TCI status indication. In the case where SCI-1 is decoded but SCI-2 is not decoded by the second UE 120-2, the second UE 120-2 may not transmit any PSFCH feedback. In this case, the sidelink unified TCI status indication is not received by the second UE 120-2. In the case where SCI-1 and SCI-2 are decoded by the second UE 120-2 but the second UE 120-2 fails to successfully decode the TB included in the PSSCH, the second UE 120-2 may transmit NACK to the first UE 120-1 in the PSFCH. In this case, the sidelink unified TCI status indication may be received by the second UE 120-2. In the case where the second UE 120-2 successfully decodes the SCI-1, SCI-2, and TB included in the PSSCH, the second UE 120-2 may send an ACK to the first UE 120-1 in the PSFCH. In this case, the sidelink unified TCI status indication is received by the second UE 120-2.

[0109] In some aspects, a PSFCH ACK associated with a PSSCH communication including an SCI-2 may also serve as an implicit ACK for an SCI including a sidelink unified TCI state indication (e.g., an implicit indication that the second UE 120-2 receives the sidelink unified TCI state indication), the SCI-2 including the sidelink unified TCI state indication. In some aspects, the first UE 120-1 and the second UE 120-2 may apply at least one sidelink unified TCI state indicated by the sidelink unified TCI state indication based at least in part on the second UE 120-2 sending sidelink feedback (e.g., PSFCH communication) and the first UE 120-1 receiving the sidelink feedback, the sidelink feedback including an ACK associated with a sidelink communication (e.g., PSSCH communication) including an SCI-2 including the sidelink unified TCI state indication. Fig.8DAnd as shown by reference numeral 870, the first UE 120-1 may send an SCI (e.g., SCI-2) including a sidelink unified TCI state indication to the second UE 120-2. As shown by reference numeral 872, the second UE 120-2 may send a PSFCH ACK related to a sidelink communication (e.g., PSSCH communication) including SCI-2 to the first UE 120-1, the SCI-2 including the sidelink unified TCI state indication. As shown by reference numeral 874, the first UE 120-1 and the second UE 120-2 may apply at least one sidelink unified TCI state indicated by the sidelink unified TCI state indication at an application time, and the application time may be at the beginning of the first time slot after a certain number of symbols (Y symbols) from the end of the PSFCH ACK.

[0110] In some aspects, because the second UE 120-2 may send a PSFCH NACK in the event that the second UE 120-2 receives a sidelink unified TCI state indication (e.g., in the event that the second UE 120-2 decodes SCI-2 but fails to successfully decode a TB included in the PSSCH), the PSFCH ACK or NACK related to the PSSCH communication may serve as an implicit ACK for the SCI that includes the sidelink unified TCI state indication (e.g., the second UE 120-2 receives an implicit indication of the sidelink unified TCI state indication). In this case, when the first UE 120-1 receives a PSFCH ACK or NACK for a PSSCH communication that includes a TCI field in SCI-2, at least the sidelink unified TCI state indicated in the TCI field may be applied at the beginning of the first time slot after a certain number of symbols (e.g., Y symbols) from the end of the PSFCH communication indicating the ACK or NACK. Fig. 8EAnd as shown by reference numeral 880, the first UE 120-1 may send an SCI (e.g., SCI-2) including a sidelink unified TCI state indication to the second UE 120-2. As shown by reference numeral 882, the second UE 120-2 may send a PSFCH ACK or NACK (PSFCH ACK / NACK) related to a PSSCH communication including SCI-2 to the first UE 120-1, the SCI-2 including the sidelink unified TCI state indication. As shown by reference numeral 884, the first UE 120-1 and the second UE 120-2 may apply at least the sidelink unified TCI state indicated by the sidelink unified TCI state indication from an application time, and the application time may be the beginning of the first time slot after Y symbols from the end of the PSFCH ACK / NACK. In some aspects, whether the first UE 120-1 and the second UE 120-2 will use PSFCH NACK (e.g., in addition to ACK) as an indication of ACK for SCI-2 including a sidelink unified TCI status indication may be configured at least in part based on traffic load (e.g., indicated in the configuration of the unified sidelink TCI status pool) or dynamically indicated (e.g., in PC5 MAC-CE or SCI).

[0111] As indicated above, FIG. 8A to FIG. 8E are provided as examples. Other examples can be found in relation to FIG. 8A to FIG. 8E The examples described are different.

[0112] Fig. 9 900 is a diagram illustrating an example process 900 performed, for example, by a first UE according to the present disclosure. Example process 900 is an example in which a first UE (eg, UE 120 and / or first UE 120-1) performs operations associated with applying a sidelink unified TCI state.

[0113] like Fig. 9 As shown, in some aspects, process 900 may include sending an indication of at least one sidelink unified TCI state to a second UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on the forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on the reverse link (block 910). For example, a first UE (e.g., using Fig.11The communication manager 140 and / or the sending component 1104 depicted in the figure may send an indication of at least one sidelink unified TCI state to the second UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple side link channels on the forward link between the first UE and the second UE and multiple side link channels on the reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple side link channels on the forward link, or a separate reverse link TCI state applicable to multiple side link channels on the reverse link, as described above.

[0114] like Fig. 9 As further shown, in some aspects, process 900 may include communicating with a second UE on at least one of a forward link or a reverse link based at least in part on an indication of a unified TCI state of the opposite link (block 920). Fig.11 The communication manager 140, receiving component 1102 and / or sending component 1104 depicted in the figure may communicate with the second UE on at least one of the forward link or the reverse link based at least in part on an indication of the unified TCI state of the side link, as described above.

[0115] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0116] In a first aspect, the multiple side link channels on the forward link include a PSCCH from a first UE to a second UE, a PSSCH from the first UE to the second UE, and a PSFCH from the first UE to the second UE, and the multiple side link channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the second UE to the first UE.

[0117] In a second aspect, either alone or in combination with the first aspect, the multiple side link channels on the forward link include a PSCCH from a first UE to a second UE, a PSSCH from the first UE to the second UE, and a PSFCH from the second UE to the first UE, and the multiple side link channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the first UE to the second UE.

[0118] In a third aspect, alone or in combination with one or more of the first and second aspects, sending an indication of at least one sidelink unified TCI state includes sending an SCI including an indication of at least one sidelink unified TCI state to a second UE.

[0119] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 900 includes sending a sidelink unified TCI state activation MAC-CE indicating an activated sidelink unified TCI state set to a second UE, wherein the indication included in the SCI is an indication of a TCI code point indicating at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

[0120] In the fifth aspect, alone or in combination with one or more of the first to fourth aspects, for each TCI code point value in the TCI code point value set, the sidelink unified TCI state activation MAC-CE includes a corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states, and for each TCI code point value in the TCI code point value set, the activated sidelink unified TCI state set includes one or more activated sidelink unified TCI states according to the corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states.

[0121] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, process 900 includes sending a configuration of one or more sidelink unified TCI state pools to a second UE, wherein an activated sidelink unified TCI state set indicated in a sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among a plurality of sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

[0122] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, one or more TCI state pools include a first side link unified TCI state pool and a second unified TCI state pool, wherein the first side link unified TCI state pool includes multiple side link unified TCI states to be used to indicate a joint forward link and reverse link TCI state and a separate forward link TCI state, and the second unified TCI state pool includes multiple side link unified TCI states to be used to indicate a separate reverse link TCI state.

[0123] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, for each activated sidelink unified TCI state in the sidelink unified TCI state set, the sidelink unified TCI state activation MAC-CE includes a corresponding TCI state ID field indicating the TCI state ID for the activated sidelink unified TCI state and a corresponding field indicating whether the TCI state ID indicated in the corresponding TCI state ID field is mapped to the first sidelink unified TCI state pool or the second sidelink unified TCI state pool.

[0124] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the configuration indicates a sidelink unified TCI state type, and the sidelink unified TCI state type is a joint forward link and reverse link TCI state or a separate forward link and reverse link TCI state.

[0125] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, sending the configuration of one or more sidelink unified TCI state pools includes sending a PC5 RRC message including the configuration of one or more sidelink unified TCI state pools to a second UE.

[0126] In an eleventh aspect, alone or in combination with one or more of aspects one to ten, process 900 includes receiving sidelink feedback indicating an ACK related to sending a sidelink unified TCI state activation MAC-CE from a second UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of a timeslot in which the sidelink feedback indicating the ACK is received.

[0127] In a twelfth aspect, alone or in combination with one or more of aspects 1 to eleven, process 900 includes receiving sidelink feedback from a second UE indicating an ACK related to sidelink communications including an SCI, the SCI including an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

[0128] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the SCI including an indication of at least one sidelink unified TCI state is an SCI-2 included in a PSSCH communication, and process 900 includes receiving, from a second UE, a PSFCH communication indicating an ACK or NACK related to a PSFCH communication including the SCI-2, the SCI-2 including an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or NACK.

[0129] although Fig. 9 Example blocks of process 900 are shown, but in some aspects, process 900 may include Fig. 9 The blocks depicted may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted. Additionally or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0130] Fig.10 1 is a diagram illustrating an example process 1000 performed, for example, by a second UE according to the present disclosure. Example process 1000 is an example in which a second UE (eg, UE 120 and / or second UE 120-2) performs operations associated with applying a sidelink unified TCI state.

[0131] like Fig.10 As shown, in some aspects, process 1000 may include receiving an indication of at least one sidelink unified TCI state from a first UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and a second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to the multiple sidelink channels on the forward link, or a separate reverse link TCI state applicable to the multiple sidelink channels on the reverse link (block 1010). For example, a second UE (e.g., using Fig.11 The communication manager 140 and / or receiving component 1102 depicted in the figure may receive an indication of at least one sidelink unified TCI state from the first UE, wherein the at least one sidelink unified TCI state includes at least one of a joint forward link and reverse link TCI state applicable to multiple side link channels on the forward link between the first UE and the second UE and multiple side link channels on the reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple side link channels on the forward link, or a separate reverse link TCI state applicable to multiple side link channels on the reverse link, as described above.

[0132] like Fig.10 As further shown, in some aspects, process 1000 may include communicating with a first UE on at least one of a forward link or a reverse link based at least in part on an indication of a unified TCI state of a peer link (block 1020). Fig.11 The communication manager 140, receiving component 1102 and / or sending component 1104 depicted in the figure may communicate with the first UE on at least one of the forward link or the reverse link based at least in part on an indication of the unified TCI state of the side link, as described above.

[0133] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0134] In a first aspect, the multiple side link channels on the forward link include a PSCCH from a first UE to a second UE, a PSSCH from the first UE to the second UE, and a PSFCH from the first UE to the second UE, and the multiple side link channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the second UE to the first UE.

[0135] In a second aspect, either alone or in combination with the first aspect, the multiple side link channels on the forward link include a PSCCH from a first UE to a second UE, a PSSCH from the first UE to the second UE, and a PSFCH from the second UE to the first UE, and the multiple side link channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the first UE to the second UE.

[0136] In a third aspect, alone or in combination with one or more of the first and second aspects, receiving an indication of at least one sidelink unified TCI state comprises receiving an SCI comprising an indication of at least one sidelink unified TCI state.

[0137] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 1000 includes receiving a sidelink unified TCI state activation MAC-CE from a first UE indicating an activated sidelink unified TCI state set, wherein the indication included in the SCI is an indication of a TCI code point indicating at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

[0138] In the fifth aspect, alone or in combination with one or more of the first to fourth aspects, for each TCI code point value in the TCI code point value set, the sidelink unified TCI state activation MAC-CE includes a corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states, and for each TCI code point value in the TCI code point value set, the activated sidelink unified TCI state set includes one or more activated sidelink unified TCI states according to the corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states.

[0139] In a sixth aspect, either alone or in combination with one or more of aspects 1 to 5, process 1000 includes receiving a configuration of one or more sidelink unified TCI state pools, wherein an activated sidelink unified TCI state set indicated in a sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among a plurality of sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

[0140] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, one or more TCI state pools include a first side link unified TCI state pool and a second unified TCI state pool, wherein the first side link unified TCI state pool includes multiple side link unified TCI states to be used to indicate a joint forward link and reverse link TCI state and a separate forward link TCI state, and the second unified TCI state pool includes multiple side link unified TCI states to be used to indicate a separate reverse link TCI state.

[0141] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, for each activated sidelink unified TCI state in the sidelink unified TCI state set, the sidelink unified TCI state activation MAC-CE includes a corresponding TCI state ID field indicating the TCI state ID for the activated sidelink unified TCI state and a corresponding field indicating whether the TCI state ID indicated in the corresponding TCI state ID field is mapped to the first sidelink unified TCI state pool or the second sidelink unified TCI state pool.

[0142] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the configuration indicates a sidelink unified TCI state type, and the sidelink unified TCI state type is a joint forward link and reverse link TCI state or a separate forward link and reverse link TCI state.

[0143] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, receiving the configuration of one or more sidelink unified TCI state pools includes receiving a PC5 RRC message including the configuration of one or more sidelink unified TCI state pools from the first UE.

[0144] In an eleventh aspect, alone or in combination with one or more of aspects one to ten, process 1000 includes sending a sidelink feedback indicating an ACK related to receiving a sidelink unified TCI state activation MAC-CE to a first UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of a timeslot in which the sidelink feedback indicating the ACK is sent.

[0145] In a twelfth aspect, alone or in combination with one or more of aspects 1 to eleven, process 1000 includes sending to a first UE sidelink feedback indicating an ACK related to sidelink communications including an SCI, the SCI including an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

[0146] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the SCI including an indication of at least one sidelink unified TCI state is an SCI-2 included in a PSSCH communication, and process 1000 includes sending a PSFCH communication indicating an ACK or NACK related to a PSFCH communication including the SCI-2 to a first UE, the SCI-2 including an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or NACK.

[0147] although Fig.10 Example blocks of process 1000 are shown, but in some aspects, process 1000 may include Fig.10 The blocks depicted may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted. Additionally or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

[0148] Fig.111 is a diagram of an example apparatus 1100 for wireless communication according to the present disclosure. Apparatus 1100 may be a UE, or a UE may include apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102 and a transmitting component 1104, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1100 may communicate with another apparatus 1106 (such as a UE, a base station, or another wireless communication device) using receiving component 1102 and transmitting component 1104. As further shown, apparatus 1100 may include a communication manager 140. Communication manager 140 may include a selection component 1108, etc.

[0149] In some aspects, the apparatus 1100 may be configured to perform FIG. 7A to FIG. 7D and FIG. 8A to FIG. 8E Additionally or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as Fig. 9 The process of 900 Fig.10 In some aspects, the apparatus 1100 and / or Fig.11 One or more of the components shown may include a combination of Figure 2 Additionally or alternatively, Fig.11 One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the component set may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as an instruction or code that is stored in a non-transitory computer-readable medium and can be executed by a controller or processor to perform the function or operation of the component.

[0150] The receiving component 1102 may receive communications from the device 1106, such as reference signals, control information, data communications, or combinations thereof. The receiving component 1102 may provide the received communications to one or more other components of the device 1100. In some aspects, the receiving component 1102 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 1100. In some aspects, the receiving component 1102 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a described UE.

[0151] The transmitting component 1104 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1106. In some aspects, one or more other components of the device 1100 may generate communications and may provide the generated communications to the transmitting component 1104 for transmission to the device 1106. In some aspects, the transmitting component 1104 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1106. In some aspects, the transmitting component 1104 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 1104 can be co-located with the receive component 1102 in a transceiver.

[0152] The transmitting component 1104 may transmit an indication of at least one sidelink unified TCI state to the second UE, wherein the at least one sidelink unified TCI state comprises at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on the forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on the reverse link. The receiving component 1102 and / or the transmitting component 1104 may communicate with the second UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

[0153] The sending component 1104 may send a sidelink unified TCI state activation MAC-CE indicating an activated sidelink unified TCI state set to the second UE, wherein the indication included in the SCI is an indication of a TCI code point indicating at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

[0154] The selecting component 1108 can select an activated sidelink unified TCI state set and / or at least one sidelink unified TCI state.

[0155] The sending component 1104 may send the configuration of one or more sidelink unified TCI state pools to the second UE, wherein an activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among multiple sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

[0156] The receiving component 1102 may receive a sidelink feedback indicating an ACK related to sending a sidelink unified TCI state activation MAC-CE from a second UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of a timeslot in which the sidelink feedback indicating the ACK is received.

[0157] The receiving component 1102 may receive sidelink feedback from a second UE indicating an ACK related to sidelink communications including an SCI, the SCI including an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

[0158] The receiving component 1102 may receive a physical PSFCH communication from a second UE indicating an ACK or NACK related to a PSFCH communication including an SCI-2, wherein the SCI-2 includes an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or NACK.

[0159] The receiving component 1102 may receive an indication of at least one sidelink unified TCI state from the first UE, wherein the at least one sidelink unified TCI state comprises at least one of a joint forward link and reverse link TCI state applicable to multiple sidelink channels on a forward link between the first UE and the second UE and multiple sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to multiple sidelink channels on the forward link, or a separate reverse link TCI state applicable to multiple sidelink channels on the reverse link. The receiving component 1102 and / or the sending component 1104 may communicate with the first UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

[0160] The receiving component 1102 may receive a sidelink unified TCI state activation MAC-CE indicating an activated sidelink unified TCI state set from the first UE, wherein the indication included in the SCI is an indication of a TCI code point indicating at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

[0161] The receiving component 1102 may receive a configuration of one or more sidelink unified TCI state pools, wherein an activated sidelink unified TCI state set indicated in a sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among a plurality of sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

[0162] The sending component 1104 may send a sidelink feedback indicating an ACK related to receiving a sidelink unified TCI state activation MAC-CE to the first UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of the timeslot in which the sidelink feedback indicating the ACK is sent.

[0163] The sending component 1104 may send sidelink feedback indicating an ACK related to sidelink communication including an SCI to the first UE, wherein the SCI includes an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

[0164] The sending component 1104 may send a PSFCH communication to the first UE indicating an ACK or NACK related to a PSFCH communication including an SCI-2, wherein the SCI-2 includes an indication of at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or NACK.

[0165] Fig.11 The number and arrangement of components shown are provided as examples. In practice, there may be Fig.11 Additional components, fewer components, different components, or components arranged in a different manner than those shown. Fig.11 Two or more components shown may be implemented in a single component, or Fig.11 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.11 The assembly of (one or more) components shown may be described as being executable by Fig.11 Another collection of components shown performs one or more functions.

[0166] The following provides an overview of some aspects of the disclosure:

[0167] Aspect 1: A method of wireless communication performed by a first user equipment (UE), comprising: sending an indication of at least one sidelink unified transmission configuration indicator (TCI) state to a second UE, wherein the at least one sidelink unified TCI state includes at least one of the following: a joint forward link and reverse link TCI state applicable to multiple side link channels on a forward link between the first UE and the second UE and multiple side link channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to the multiple side link channels on the forward link, or a separate reverse link TCI state applicable to the multiple side link channels on the reverse link; and communicating with the second UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

[0168] Aspect 2: A method according to Aspect 1, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the first UE to the second UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the second UE to the first UE.

[0169] Aspect 3: A method according to Aspect 1, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the second UE to the first UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the first UE to the second UE.

[0170] Aspect 4: A method according to any one of Aspects 1 to 3, wherein sending the indication of the at least one sidelink unified TCI state includes: sending sidelink control information (SCI) including the indication of the at least one sidelink unified TCI state to the second UE.

[0171] Aspect 5: The method according to Aspect 4 also includes: sending a sidelink unified TCI state activation medium access control (MAC) control element (MAC-CE) indicating an activated sidelink unified TCI state set to the second UE, wherein the indication included in the SCI is an indication of a TCI code point, and the TCI code point indicates at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

[0172] Aspect 6: A method according to Aspect 5, wherein for each TCI code point value in the TCI code point value set, the sidelink unified TCI state activation MAC-CE includes a corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states, and wherein for each TCI code point value in the TCI code point value set, the activated sidelink unified TCI state set includes one or more activated sidelink unified TCI states according to the corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states.

[0173] Aspect 7: The method according to any one of Aspects 5 to 6 also includes: sending the configuration of one or more sidelink unified TCI state pools to the second UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among the multiple sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

[0174] Aspect 8: A method according to Aspect 7, wherein the one or more TCI state pools include a first side link unified TCI state pool and a second unified TCI state pool, the first side link unified TCI state pool including multiple side link unified TCI states to be used to indicate a joint forward link and reverse link TCI state and a separate forward link TCI state, and the second unified TCI state pool including multiple side link unified TCI states to be used to indicate a separate reverse link TCI state.

[0175] Aspect 9: A method according to Aspect 8, wherein for each activated sidelink unified TCI state in the sidelink unified TCI state set, the sidelink unified TCI state activation MAC-CE includes a corresponding TCI state ID field indicating a TCI state identifier (ID) for the activated sidelink unified TCI state and a corresponding field indicating whether the TCI state ID indicated in the corresponding TCI state ID field is mapped to the first sidelink unified TCI state pool or the second sidelink unified TCI state pool.

[0176] Aspect 10: A method according to any one of Aspects 7 to 9, wherein the configuration indicates a sidelink unified TCI state type, and wherein the sidelink unified TCI state type is a joint forward link and reverse link TCI state or a separate forward link and reverse link TCI state.

[0177] Aspect 11: A method according to any one of Aspects 7 to 10, wherein sending the configuration of the one or more sidelink unified TCI state pools includes: sending a PC5 radio resource control (RRC) message including the configuration of the one or more sidelink unified TCI state pools to the second UE.

[0178] Aspect 12: The method according to any one of Aspects 5 to 11 further includes: receiving sidelink feedback indicating an acknowledgment (ACK) related to sending the sidelink unified TCI state activation MAC-CE from the second UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of the time slot in which the sidelink feedback indicating the ACK is received.

[0179] Aspect 13: The method according to any one of Aspects 4 to 12 further includes: receiving sidelink feedback from the second UE indicating an acknowledgment (ACK) related to the sidelink communication including the SCI, the SCI including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of the first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

[0180] Aspect 14: A method according to any one of Aspects 4 to 12, wherein the SCI including the indication of the at least one sidelink unified TCI state is a second-level SCI (SCI-2) included in a physical sidelink shared channel (PSSCH) communication, and the method further includes: receiving from the second UE an indication of an acknowledgment (ACK) or a negative acknowledgment (NACK) related to a physical sidelink feedback channel (PSFCH) communication including the SCI-2, the SCI-2 including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of the first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or the NACK.

[0181] Aspect 15: A method for wireless communication performed by a second user equipment (UE), comprising: receiving an indication of at least one sidelink unified transmit configuration indicator (TCI) state from a first UE, wherein the at least one sidelink unified TCI state includes at least one of the following: a joint forward link and reverse link TCI state applicable to multiple side link channels on a forward link between the first UE and the second UE and multiple side link channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to the multiple side link channels on the forward link, or a separate reverse link TCI state applicable to the multiple side link channels on the reverse link; and communicating with the first UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

[0182] Aspect 16: A method according to Aspect 15, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the first UE to the second UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the second UE to the first UE.

[0183] Aspect 17: A method according to Aspect 15, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the second UE to the first UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the first UE to the second UE.

[0184] Aspect 18: A method according to any one of Aspects 15 to 17, wherein receiving the indication of the at least one sidelink unified TCI state includes: receiving side link control information (SCI) including the indication of the at least one sidelink unified TCI state.

[0185] Aspect 19: The method according to Aspect 18 also includes: receiving a sidelink unified TCI state activation medium access control (MAC) control element (MAC-CE) indicating an activated sidelink unified TCI state set from the first UE, wherein the indication included in the SCI is an indication of a TCI code point, and the TCI code point indicates at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

[0186] Aspect 20: A method according to Aspect 19, wherein for each TCI code point value in the TCI code point value set, the sidelink unified TCI state activation MAC-CE includes a corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states, and wherein for each TCI code point value in the TCI code point value set, the activated sidelink unified TCI state set includes one or more activated sidelink unified TCI states according to the corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or multiple sidelink unified TCI states.

[0187] Aspect 21: The method according to any one of Aspects 19 to 20 further includes: receiving the configuration of one or more sidelink unified TCI state pools, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among the multiple sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

[0188] Aspect 22: A method according to Aspect 21, wherein the one or more TCI state pools include a first side link unified TCI state pool and a second unified TCI state pool, the first side link unified TCI state pool including multiple side link unified TCI states to be used to indicate a joint forward link and reverse link TCI state and a separate forward link TCI state, and the second unified TCI state pool including multiple side link unified TCI states to be used to indicate a separate reverse link TCI state.

[0189] Aspect 23: A method according to Aspect 22, wherein for each activated sidelink unified TCI state in the sidelink unified TCI state set, the sidelink unified TCI state activation MAC-CE includes a corresponding TCI state ID field indicating a TCI state identifier (ID) for the activated sidelink unified TCI state and a corresponding field indicating whether the TCI state ID indicated in the corresponding TCI state ID field is mapped to the first sidelink unified TCI state pool or the second sidelink unified TCI state pool.

[0190] Aspect 24: A method according to any one of Aspects 21 to 23, wherein the configuration indicates a sidelink unified TCI state type, and wherein the sidelink unified TCI state type is a joint forward link and reverse link TCI state or a separate forward link and reverse link TCI state.

[0191] Aspect 25: A method according to any one of Aspects 21 to 24, wherein receiving the configuration of the one or more sidelink unified TCI state pools includes: receiving a PC5 radio resource control (RRC) message including the configuration of the one or more sidelink unified TCI state pools from the first UE.

[0192] Aspect 26: The method according to any one of Aspects 19 to 25 further includes: sending a sidelink feedback indicating an acknowledgment (ACK) related to receiving the sidelink unified TCI state activation MAC-CE to the first UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of the time slot in which the sidelink feedback indicating the ACK is sent.

[0193] Aspect 27: The method according to any one of Aspects 18 to 26 further includes: sending a sidelink feedback indicating an acknowledgment (ACK) related to the sidelink communication including the SCI to the first UE, the SCI including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of the first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

[0194] Aspect 28: A method according to any one of Aspects 18 to 26, wherein the SCI including the indication of the at least one sidelink unified TCI state is a second-level SCI (SCI-2) included in a physical sidelink shared channel (PSSCH) communication, and the method further includes: sending to the first UE an indication of an acknowledgment (ACK) or a negative acknowledgment (NACK) related to a physical sidelink feedback channel (PSFCH) communication including the SCI-2, the SCI-2 including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of the first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or the NACK.

[0195] Aspect 29: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 1 to 14.

[0196] Aspect 30: A device for wireless communication, the device comprising: a memory; and one or more processors, the one or more processors coupled to the memory, the one or more processors configured to execute the method according to one or more of aspects 1 to 14.

[0197] Aspect 31: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 1 to 14.

[0198] Aspect 32: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1 to 14.

[0199] Aspect 33: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more of the methods described in aspects 1 to 14.

[0200] Aspect 34: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 15 to 28.

[0201] Aspect 35: A device for wireless communication, the device comprising: a memory; and one or more processors, the one or more processors coupled to the memory, the one or more processors configured to execute the method according to one or more of aspects 15 to 28.

[0202] Aspect 36: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 15 to 28.

[0203] Aspect 37: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 15 to 28.

[0204] Aspect 38: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more of the methods described in aspects 15 to 28.

[0205] While the foregoing disclosure provides illustration and description, it is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of these aspects.

[0206] As used herein, the term "component" is intended to be broadly interpreted as hardware and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other names, "software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads implemented, procedures and / or functions, etc. As used herein, "processor" is implemented in hardware and / or a combination of hardware and software. It will be clear that the systems and / or methods described herein can be implemented by different forms of hardware and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Therefore, no reference is made to specific software codes to describe the operation and behavior of the systems and / or methods herein, because those skilled in the art will understand that software and hardware can be designed to implement the systems and / or methods based at least in part on the descriptions herein.

[0207] As used herein, "satisfying a threshold" may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0208] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of each aspect. Many of these features may be combined in a manner that is not specifically described in the claims and / or is not disclosed in the specification. The disclosure of each aspect includes each dependent claim combined with each other claim in the claim set. As used herein, a phrase referring to "at least one of" a list of items refers to any combination of these items (including a single member). As an example, "at least one of a, b, or c" is intended to cover a, b, c, a+b, a+c, b+c, and a+b+c, as well as any combination with multiple identical elements (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c, and c+C+c, or any other ordering of a, b, and c).

[0209] Any element, action or instruction used herein should not be interpreted as critical or essential unless explicitly stated. In addition, as used herein, the articles "one" and "a kind of" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more items connected to the article "said", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items and can be used interchangeably with "one or more". If only one item is intended to be referred to, the phrase "only one" or similar terms are used. In addition, as used herein, the term "having" etc. is intended to be an open term, which does not limit the elements they modify (for example, "an element having" A can also have B). In addition, the phrase "based on" is intended to mean "based at least in part on", unless explicitly stated otherwise. Furthermore, as used herein, the term "or" when used in a series is intended to be open-ended and used interchangeably with "and / or" unless explicitly stated otherwise (e.g., if used in conjunction with "either" or "only one of").

Claims

1. A first user equipment (UE) for wireless communication, the first user equipment (UE) comprising: Memory; and one or more processors coupled to the memory and configured to: sending an indication of at least one sidelink unified transmit configuration indicator (TCI) state to a second UE, wherein the at least one sidelink unified TCI state comprises at least one of the following: a joint forward link and reverse link TCI state applicable to a plurality of sidelink channels on a forward link between the first UE and the second UE and a plurality of sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to said plurality of sidelink channels on said forward link, or separate reverse link TCI states applicable to the plurality of sidelink channels on the reverse link; and Communicate with the second UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

2. The first UE according to claim 1, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the first UE to the second UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the second UE to the first UE.

3. The first UE according to claim 1, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the second UE to the first UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the first UE to the second UE.

4. The first UE of claim 1 , wherein to send the indication of the at least one sidelink unified TCI state, the one or more processors are configured to: and sending sidelink control information (SCI) including the indication of the at least one sidelink unified TCI state to the second UE.

5. The first UE according to claim 4, wherein the one or more processors are further configured to: A sidelink unified TCI state activation medium access control (MAC) control element (MAC-CE) indicating an activated sidelink unified TCI state set is sent to the second UE, wherein the indication included in the SCI is an indication of a TCI code point, and the TCI code point indicates at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

6. The first UE according to claim 5, wherein for each TCI code point value in the TCI code point value set, the sidelink unified TCI state activation MAC-CE includes a corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or a plurality of sidelink unified TCI states, and wherein for each TCI code point value in the TCI code point value set, the activated sidelink unified TCI state set includes one or more activated sidelink unified TCI states according to the corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or a plurality of sidelink unified TCI states.

7. The first UE according to claim 5, wherein the one or more processors are further configured to: The configuration of one or more sidelink unified TCI state pools is sent to the second UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among the multiple sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

8. The first UE according to claim 7, wherein the one or more TCI state pools include a first sidelink unified TCI state pool and a second unified TCI state pool, the first sidelink unified TCI state pool including multiple sidelink unified TCI states to be used to indicate a joint forward link and reverse link TCI state and a separate forward link TCI state, and the second unified TCI state pool including multiple sidelink unified TCI states to be used to indicate a separate reverse link TCI state.

9. The first UE according to claim 8, wherein, for each activated sidelink unified TCI state in the sidelink unified TCI state set, the sidelink unified TCI state activation MAC-CE includes a corresponding TCI state ID field indicating a TCI state identifier (ID) for the activated sidelink unified TCI state and a corresponding field indicating whether the TCI state ID indicated in the corresponding TCI state ID field is mapped to the first sidelink unified TCI state pool or the second sidelink unified TCI state pool.

10. The first UE of claim 7, wherein the configuration indicates a sidelink unified TCI state type, and wherein the sidelink unified TCI state type is a joint forward link and reverse link TCI state or a separate forward link and reverse link TCI state.

11. The first UE of claim 7, wherein to send the configuration of the one or more sidelink unified TCI state pools, the one or more processors are configured to: A PC5 radio resource control (RRC) message including the configuration of the one or more sidelink unified TCI state pools is sent to the second UE.

12. The first UE of claim 5, wherein the one or more processors are further configured to: receiving, from the second UE, a sidelink feedback indicating an acknowledgment (ACK) related to sending the sidelink unified TCI state activation MAC-CE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of the timeslot in which the sidelink feedback indicating the ACK is received.

13. The first UE of claim 4, wherein the one or more processors are further configured to: receiving, from the second UE, sidelink feedback indicating an acknowledgment (ACK) related to sidelink communication including the SCI, the SCI including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

14. The first UE of claim 4, wherein the SCI including the indication of the at least one sidelink unified TCI state is a second level SCI (SCI-2) included in a physical sidelink shared channel (PSSCH) communication, and wherein the one or more processors are further configured to: receiving from the second UE a physical sidelink feedback channel (PSFCH) communication indicating an acknowledgment (ACK) or a negative acknowledgment (NACK) related to a PSFCH communication including the SCI-2, the SCI-2 including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or the NACK.

15. A second user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory and configured to: Receiving an indication of at least one sidelink unified transmit configuration indicator (TCI) state from the first UE, wherein the at least one sidelink unified TCI state comprises at least one of the following: a joint forward link and reverse link TCI state applicable to a plurality of sidelink channels on a forward link between the first UE and the second UE and a plurality of sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to said plurality of sidelink channels on said forward link, or separate reverse link TCI states applicable to the plurality of sidelink channels on the reverse link; and Communicate with the first UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

16. The second UE according to claim 15, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the first UE to the second UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the second UE to the first UE.

17. The second UE according to claim 15, wherein the multiple sidelink channels on the forward link include a physical sidelink control channel (PSCCH) from the first UE to the second UE, a physical sidelink shared channel (PSSCH) from the first UE to the second UE, and a physical sidelink feedback channel (PSFCH) from the second UE to the first UE, and wherein the multiple sidelink channels on the reverse link include a PSCCH from the second UE to the first UE, a PSSCH from the second UE to the first UE, and a PSFCH from the first UE to the second UE.

18. The second UE of claim 15, wherein to receive the indication of the at least one sidelink unified TCI state, the one or more processors are configured to: Sidelink control information (SCI) is received including the indication of the at least one sidelink unified TCI state.

19. The second UE of claim 18, wherein the one or more processors are further configured to: A sidelink unified TCI state activation medium access control (MAC) control element (MAC-CE) indicating an activated sidelink unified TCI state set is received from the first UE, wherein the indication included in the SCI is an indication of a TCI code point, and the TCI code point indicates at least one activated sidelink unified TCI state in the activated sidelink unified TCI state set.

20. The second UE according to claim 19, wherein for each TCI code point value in the TCI code point value set, the sidelink unified TCI state activation MAC-CE includes a corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or a plurality of sidelink unified TCI states, and wherein for each TCI code point value in the TCI code point value set, the activated sidelink unified TCI state set includes one or more activated sidelink unified TCI states according to the corresponding field indicating whether the TCI code point value indicates a single sidelink unified TCI state or a plurality of sidelink unified TCI states.

21. The second UE of claim 19, wherein the one or more processors are further configured to: Receive a configuration of one or more sidelink unified TCI state pools, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE includes activated sidelink unified TCI states among the multiple sidelink unified TCI states included in the one or more sidelink unified TCI state pools.

22. A second UE according to claim 21, wherein the one or more TCI state pools include a first sidelink unified TCI state pool and a second unified TCI state pool, the first sidelink unified TCI state pool including multiple sidelink unified TCI states to be used to indicate a joint forward link and reverse link TCI state and a separate forward link TCI state, and the second unified TCI state pool including multiple sidelink unified TCI states to be used to indicate a separate reverse link TCI state.

23. The second UE according to claim 22, wherein, for each activated sidelink unified TCI state in the sidelink unified TCI state set, the sidelink unified TCI state activation MAC-CE includes a corresponding TCI state ID field indicating a TCI state identifier (ID) for the activated sidelink unified TCI state and a corresponding field indicating whether the TCI state ID indicated in the corresponding TCI state ID field is mapped to the first sidelink unified TCI state pool or the second sidelink unified TCI state pool.

24. The second UE of claim 21, wherein the configuration indicates a sidelink unified TCI state type, and wherein the sidelink unified TCI state type is a joint forward link and reverse link TCI state or a separate forward link and reverse link TCI state.

25. The second UE of claim 21, wherein to receive the configuration of the one or more sidelink unified TCI state pools, the one or more processors are configured to: A PC5 radio resource control (RRC) message including the configuration of the one or more sidelink unified TCI state pools is received from the first UE.

26. The second UE of claim 19, wherein the one or more processors are further configured to: and sending a sidelink feedback indicating an acknowledgment (ACK) related to receiving the sidelink unified TCI state activation MAC-CE to the first UE, wherein the activated sidelink unified TCI state set indicated in the sidelink unified TCI state activation MAC-CE is activated after an application duration from the end of the timeslot in which the sidelink feedback indicating the ACK is sent.

27. The second UE of claim 18, wherein the one or more processors are further configured to: sending a sidelink feedback to the first UE indicating an acknowledgment (ACK) related to the sidelink communication including the SCI, the SCI including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the sidelink feedback indicating the ACK.

28. The second UE of claim 18, wherein the SCI including the indication of the at least one sidelink unified TCI state is a second level SCI (SCI-2) included in a physical sidelink shared channel (PSSCH) communication, and wherein the one or more processors are further configured to: sending to the first UE a physical sidelink feedback channel (PSFCH) communication indicating an acknowledgment (ACK) or a negative acknowledgment (NACK) related to a PSFCH communication including the SCI-2, the SCI-2 including the indication of the at least one sidelink unified TCI state, wherein the at least one sidelink unified TCI state is applied at the beginning of a first time slot after a certain number of symbols from the end of the PSFCH communication indicating the ACK or the NACK.

29. A method of wireless communication performed by a first user equipment (UE), comprising: sending an indication of at least one sidelink unified transmit configuration indicator (TCI) state to a second UE, wherein the at least one sidelink unified TCI state comprises at least one of the following: a joint forward link and reverse link TCI state applicable to a plurality of sidelink channels on a forward link between the first UE and the second UE and a plurality of sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to said plurality of sidelink channels on said forward link, or separate reverse link TCI states applicable to the plurality of sidelink channels on the reverse link; and Communicate with the second UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

30. A method of wireless communication performed by a second user equipment (UE), comprising: Receiving an indication of at least one sidelink unified transmit configuration indicator (TCI) state from the first UE, wherein the at least one sidelink unified TCI state comprises at least one of the following: a joint forward link and reverse link TCI state applicable to a plurality of sidelink channels on a forward link between the first UE and the second UE and a plurality of sidelink channels on a reverse link between the first UE and the second UE, a separate forward link TCI state applicable to said plurality of sidelink channels on said forward link, or separate reverse link TCI states applicable to the multiple sidelink channels on the reverse link; and communicating with the first UE on at least one of the forward link or the reverse link based at least in part on the indication of the sidelink unified TCI state.

Images