Transmission configuration indicator state selection for reference signals in multiple transmission and reception point operations

Abstract

Methods, systems, and devices for wireless communication are described. In multiple transmit and receive point (TRP) operations, a user equipment (UE) may communicate with a network via two or more TRPs. Each TRP may be associated with a transmit configuration indicator (TCI) state, which may be indicated by the network to the UE. A UE, which has established a communication link with the network by two or more TRPs, may receive scheduling information for a set of reference signals (e.g., sounding reference signals or channel state information reference signals). The UE may identify a TCI state to be applied to each reference signal in the set of reference signals, and then communicate with the network according to the respective TCI state identified for each reference signal in the set of reference signals.

Description

Technical Field

[0001] The following relates to wireless communications, including transmit configuration indicator state selection for reference signals in multiple transmit and receive point operations. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communication for a communication device, which may be referred to as a user equipment (UE). Summary of the invention

[0003] The described technology relates to improved methods, systems, devices and apparatuses for supporting transmission configuration indicator (TCI) state selection for reference signals in multiple transmission and reception point (TRP) operations. In multi-TRP operation, a user equipment (UE) may communicate with a network via two or more TRPs. Each TRP may be associated with a transmission configuration indicator (TCI) state, which may be indicated to the UE by the network. A UE that has established a communication link with a network by two or more TRPs may receive scheduling information for a set of reference signals (e.g., a sounding reference signal (SRS) or a channel state information reference signal (CSI-RS)). The UE may identify the TCI state to be applied to each reference signal in the reference signal set, and then communicate with the network according to the corresponding TCI state identified for each reference signal in the reference signal set.

[0004] A method for wireless communication at a UE is described. The method may include: establishing a communication link with a network via a first TRP and a second TRP; receiving scheduling information for a reference signal set; identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0005] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: establish a communication link with a network via a first TRP and a second TRP; receive scheduling information for a reference signal set; identify a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and communicate with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0006] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for establishing a communication link with a network via a first TRP and a second TRP; a component for receiving scheduling information for a reference signal set; a component for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and a component for communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0007] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: establish a communication link with a network via a first TRP and a second TRP; receive scheduling information for a reference signal set; identify a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and communicate with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0008] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving control signaling indicating the respective TCI state for each reference signal in the set of reference signals.

[0009] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein the control signaling indicates one of the following for each reference signal: the first TCI state, the second TCI state, or a different TCI state.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, for each reference signal in the reference signal set, an indication of whether the corresponding TCI state corresponds to a first corresponding transmit indicator state or to a corresponding different transmit indicator state based on the association of each reference signal with the first TRP or the second TRP.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the control signaling may include operations, features, components, or instructions for: receiving the control signaling via a medium access control (MAC) control element (CE), wherein the control signaling replaces a previous indication of a corresponding TCI state for the reference signal set.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the control signaling may include operations, features, components, or instructions for receiving the control signaling via a radio resource control (RRC) message.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a downlink control information (DCI) message including a corresponding TRP indicator field for each reference signal in the reference signal set, wherein identifying the corresponding TCI state for each reference signal in the reference signal set may be based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein identifying the corresponding TCI state for each reference signal in the reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the TCI state for each reference signal in the reference signal set may include operations, features, components, or instructions for identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set based on an order of the reference signal set.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set may include the following operations, features, components, or instructions: sending the SRS set based on the corresponding TCI state identified for each SRS in the SRS set.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set may include operations, features, components, or instructions for receiving the CSI-RS set based on the corresponding TCI state identified for each CSI-RS in the CSI-RS set.

[0018] A method for wireless communication at a network entity is described. The method may include: establishing a communication link with a UE via a first TRP and a second TRP; sending scheduling information for a reference signal set to the UE; identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and communicating with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0019] An apparatus for wireless communication at a network entity is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: establish a communication link with a UE via a first TRP and a second TRP; send scheduling information for a reference signal set to the UE; identify a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and communicate with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0020] Another apparatus for wireless communication at a network entity is described. The apparatus may include: a component for establishing a communication link with a UE via a first TRP and a second TRP; a component for sending scheduling information for a reference signal set to the UE; a component for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and a component for communicating with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0021] A non-transitory computer-readable medium storing code for wireless communication at a network entity is described. The code may include instructions executable by a processor to: establish a communication link with a UE via a first TRP and a second TRP; send scheduling information for a reference signal set to the UE; identify a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP; and communicate with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending control signaling to the UE indicating the respective TCI state for each reference signal in the reference signal set.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein the control signaling indicates one of the following for each reference signal: the first TCI state, the second TCI state, or a different TCI state.

[0024] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending, for each reference signal in the reference signal set, an indication of whether the corresponding TCI state corresponds to a first corresponding transmission indicator state or to a corresponding different transmission indicator state based on the association of each reference signal with the first TRP or the second TRP.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the control signaling may include operations, features, components, or instructions for: sending the control signaling via a MAC-CE, wherein the control signaling replaces a previous indication of a corresponding TCI state for the reference signal set.

[0026] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending the control signaling via an RRC message.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a DCI message to the UE that includes a corresponding TRP indicator field for each reference signal in the reference signal set, wherein identifying the corresponding TCI state for each reference signal in the reference signal set may be based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein identifying the corresponding TCI state for each reference signal in the reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the TCI state for each reference signal in the reference signal set may include operations, features, components, or instructions for identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set based on an order of the reference signal set.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, communicating with the UE based on the corresponding TCI state identified for each reference signal in the reference signal set may include the following operations, features, components, or instructions: receiving the SRS set based on the corresponding TCI state identified for each SRS in the SRS set.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, communicating with the UE based on the corresponding TCI state identified for each reference signal in the reference signal set may include operations, features, components, or instructions for sending the CSI-RS set based on the corresponding TCI state identified for each CSI-RS in the CSI-RS set. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 An example of a wireless communication system supporting transmission configuration indicator (TCI) state selection for a reference signal in multiple transmission and reception point (TRP) operation according to one or more aspects of the present disclosure is illustrated.

[0033] Figure 2An example of a network architecture supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated.

[0034] Figure 3 An example of a wireless communication system supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated.

[0035] Figure 4 An example of a process flow for supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated.

[0036] Figure 5 An example of a process flow for supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated.

[0037] Figure 6 and Figure 7 A block diagram of a device supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown.

[0038] Figure 8 A block diagram of a communication manager supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown.

[0039] Fig. 9 A diagram of a system including a device supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown.

[0040] Fig.10 and Fig.11 A block diagram of a device supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown.

[0041] Fig.12 A block diagram of a communication manager supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown.

[0042] Fig.13 A diagram of a system including a device supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown.

[0043] Figures 14 to 19 A flowchart illustrating a method for TCI state selection for a reference signal in supporting multi-TRP operation according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0044] In some wireless communication systems, a user equipment (UE) may communicate with a network entity via two or more transmit / receive points (TRPs) (e.g., multi-TRP operation). Each TRP may be associated with a transmit configuration indicator (TCI) state, which may be indicated to the UE by the network. A UE communicating with a network in multi-TPR operation may send or receive reference signals via multiple TRPs. For example, the UE may send a sounding reference signal (SRS), or the UE may receive a channel state information reference signal (CSI-RS) from a TRP. Currently, there is no defined behavior to determine a unified TCI state to be applied to the transmission or reception of reference signals in multi-TRP operation. If this problem is not resolved, channel estimates based on these reference signals may be inaccurate, resulting in poor network performance.

[0045] A UE that has established a communication link with a network by two or more TRPs may receive scheduling information for a reference signal (e.g., SRS or CSI-RS) set. The UE may identify the TCI state to be applied to each reference signal in the reference signal set, and then communicate with the network based on the corresponding TCI state identified for each reference signal in the reference signal set. In some cases, the TCI state to be applied to each corresponding reference signal in the reference signal set may be indicated by control signaling (e.g., radio resource control (RRC) signaling, medium access control (MAC) control element (CE), or downlink control information (DCI) message). In some cases, control signaling (e.g., DCI message) for scheduling or activating a reference signal set may indicate the TCI state to be applied to each reference signal in the reference signal set. In some cases, the TCI state to be applied to each reference signal in the reference signal set may be based on the TRP associated with each reference signal in the corresponding reference signal (e.g., which may be indicated in the control signaling for scheduling or activating the reference signal set). In some cases, the UE may determine the TCI state to be applied to each respective reference signal in the reference signal set based on a configured rule. For example, the rule may define which TCI state to apply to which reference signal based on the order of the reference signals.

[0046] Various aspects of the present disclosure are first described in the context of a wireless communication system. Various aspects of the present disclosure are further illustrated and described with reference to process flows, apparatus diagrams, system diagrams, and flow diagrams related to TCI state selection for reference signals in multi-TRP operations.

[0047] Figure 1An example of a wireless communication system 100 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, a new radio (NR) network, or a network operating according to other systems and radio technologies including future systems and radio technologies not explicitly mentioned herein.

[0048] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may include devices in different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, etc. In some examples, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area), and the UE 115 and the network entity 105 may establish one or more communication links 125 over the coverage area. The coverage area 110 may be an example of a geographic area, and the network entity 105 and the UE 115 may support signal communication over the geographic area according to one or more radio access technologies (RATs).

[0049] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1 . The UEs 115 described herein may be capable of supporting communication with various types of devices, such as Figure 1 Communicate with other UEs 115 or network entities 105) as shown.

[0050] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from a second node.

[0051] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other directly (e.g., directly between each network entity 105) or indirectly (e.g., via the core network 130) via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via midhaul communication links 162 (e.g., according to a midhaul interface protocol) or fronthaul communication links 168 (e.g., according to a fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0052] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next-generation Node B, or a giga-Node B (any of which may be referred to as a gNB), a 5G NB, a next-generation eNB (ng-eNB), a home Node B, a home evolved Node B, or other suitable terms). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0053] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a TRP. One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0054] The functional split between CU 160, DU 165 and RU 170 is flexible, and different functionalities can be supported depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, and RU 170. For example, a functional split of a protocol stack can be employed between CU 160 and DU 165, such that CU 160 can support one or more layers of a protocol stack, and DU 165 can support one or more different layers of a protocol stack. In some examples, CU 160 can host higher protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by the other of CU 160, DU 165, or RU 170). CU 160 may be further functionally split into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented based on an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 105 that communicate via such communication links.

[0055] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to the core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as host entities or IAB hosts. One or more DUs 165 or one or more RUs 170 may be controlled in part by one or more CUs 160 associated with a host network entity 105 (e.g., a host base station 140). One or more host network entities 105 (e.g., IAB hosts) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB host. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0056] For example, an access network (AN) or RAN may include an access node (e.g., an IAB host), communications between an IAB node 104, and one or more UEs 115. The IAB host may facilitate connectivity between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130). That is, the IAB host may refer to a RAN node having a wired or wireless connection to the core network 130. The IAB host may include a CU 160 and at least one DU 165 (e.g., and RU 170), in which case the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link). The IAB host and the IAB node 104 may communicate via an F1 interface according to a protocol defining signaling messages (e.g., an F1AP protocol). Additionally or alternatively, CU 160 may communicate with the core network via an interface (which may be an example of part of a backhaul link) and may communicate with other CUs 160 (e.g., CU 160 associated with an alternative IAB host) via an Xn-C interface (which may be an example of part of a backhaul link).

[0057] An IAB node 104 may refer to a RAN node that provides IAB functionality (e.g., access for UE 115, wireless self-backhaul capabilities, etc.). DU 165 may act as a distributed scheduling node toward child nodes associated with IAB node 104, and IAB-MT may act as a scheduled node toward a parent node associated with IAB node 104. That is, an IAB host may be referred to as a parent node that communicates with one or more child nodes (e.g., an IAB host may relay for UE transmissions through one or more other IAB nodes 104). Additionally or alternatively, depending on the relay chain or configuration of the AN, an IAB node 104 may also be referred to as a parent node or child node of other IAB nodes 104. Therefore, the IAB-MT entity of the IAB node 104 may provide a Uu interface for the child IAB node 104 to receive signaling from the parent IAB node 104, and a DU interface (eg, DU 165) may provide a Uu interface for the parent IAB node 104 to signal the child IAB node 104 or the UE 115.

[0058] For example, the IAB node 104 may be referred to as a parent node that supports communications for a child IAB node or as a child node associated with the IAB host, or both. The IAB host may include a CU 160 having a wired or wireless connection (e.g., backhaul communication link 120) to the core network 130, and may act as a parent node of the IAB node 104. For example, the DU 165 of the IAB host may relay the transmission to the UE 115 via the IAB node 104, or may directly signal the transmission to the UE 115, or both. The CU 160 of the IAB host may signal the establishment of a communication link to the IAB node 104 via the F1 interface, and the IAB node 104 may schedule the transmission (e.g., the transmission relayed from the IAB host to the UE 115) via the DU 165. That is, data may be relayed to and from the IAB node 104 via signaling via the NR Uu interface of the MT to the IAB node 104. Communications with the IAB node 104 may be scheduled by the DU 165 of the IAB host, and communications with the IAB node 104 may be scheduled by the DU 165 of the IAB node 104 .

[0059] In the case where the techniques described herein are applied to the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support TCI state selection for reference signals in multi-TRP operation as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may be additionally or alternatively performed by one or more components of the decomposed RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0060] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0061] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 shown.

[0062] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a collection of RF spectrum resources having a defined physical layer structure to support the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between a device and any portion (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send," "receive," or "communicate," when referring to the network entity 105, may refer to any portion of a network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0063] In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be identified based on a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, in which case initial acquisition and connection may be performed by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, in which case the connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0064] The communication link 125 shown in the wireless communication system 100 may include downlink transmissions (e.g., forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (e.g., return link transmissions) from the UE 115 to the network entity 105, or both, as well as other transmission configurations. A carrier may carry downlink communications or uplink communications (e.g., in FDD mode), or may be configured to carry downlink communications and uplink communications (e.g., in TDD mode).

[0065] A carrier may be associated with a particular bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a set of bandwidths of carriers of a particular radio access technology (e.g., 1.4 megahertz (MHz), 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz). A device of the wireless communication system 100 (e.g., a network entity 105, a UE 115, or both) may have a hardware configuration that supports communications using a particular carrier bandwidth, or may be capable of being configured to support communications using one of the carrier bandwidths in the set of carrier bandwidths. In some examples, the wireless communication system 100 may include a network entity 105 or a UE 115 that supports concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., a subband, a BWP) or all of the carrier bandwidth.

[0066] The signal waveform transmitted via the carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and the subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that (e.g., in the transmission duration) a relatively high number of resource elements and a relatively high order modulation scheme may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers, beams), and the use of multiple spatial resources may increase the data rate or data integrity of the communication with the UE 115.

[0067] One or more parameter sets for a carrier may be supported, and the parameter sets may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications of a UE 115 may be constrained to one or more active BWPs.

[0068] The time interval for the network entity 105 or the UE 115 may be expressed in multiples of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the supported subcarrier spacing, and N f The supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (e.g., ranging from 0 to 1023).

[0069] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, the time slot may be further divided into multiple micro time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0070] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0071] Physical channels may be multiplexed using carriers for communication according to various techniques. For example, physical control channels and physical data channels may be multiplexed via downlink carriers using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique for signaling. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs in UE 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to a plurality of UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0072] The network entity 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with the network entity 105 (e.g., using a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other identifier) ​​used to distinguish adjacent cells. In some examples, a cell may also refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) on which the logical communication entity operates. Depending on various factors such as the capabilities of the network entity 105, such cells may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area. For example, a cell may be or may include a building, a subset of a building, or an external space between or overlapping coverage areas 110, etc.

[0073] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs 115 that have a service subscription with a network provider that supports the macro cell. A small cell may be associated with a lower power network entity 105 (e.g., a lower power base station 140) (compared to a macro cell), and the small cell may operate using the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 that have a service subscription with a network provider, or may provide restricted access to UEs 115 associated with a small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a home or office). A network entity 105 may support one or more cells, and may also support communications via one or more cells using one or more component carriers.

[0074] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0075] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0076] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the network entities 105 (e.g., base stations 140) may have similar frame timing, and transmissions from different network entities 105 may be approximately aligned in time. For asynchronous operation, the network entities 105 may have different frame timing, and in some examples, transmissions from different network entities 105 may not be aligned in time. The techniques described herein may be used for either synchronous operation or asynchronous operation.

[0077] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC may include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0078] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but does not support concurrent transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other energy-saving techniques for UE 115 include entering a power-saving deep sleep mode when not engaged in active communications, operating using limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0079] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). The UE 115 may be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video, or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety applications or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency are used interchangeably herein.

[0080] In some examples, the UE 115 may be configured to support communication directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., a base station 140, a RU 170), which may support aspects of such D2D communication configured (e.g., scheduled) by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105.

[0081] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units) using vehicle-to-network (V2N) communication, or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU170), or both.

[0082] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity for managing access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity for routing packets or interconnecting to an external network (e.g., a serving gateway (S-GW)), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered via the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 150 for one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0083] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 kilohertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide services to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to communications using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0084] The wireless communication system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz (also known as a centimeter band), or an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also known as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between a UE 115 and a network entity 105 (e.g., a base station 140, a RU 170), and the EHF antennas of the corresponding devices may be smaller and closer together than UHF antennas. In some examples, such techniques may facilitate the use of antenna arrays within a device. However, the propagation of EHF transmissions may be affected by even greater attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the use of frequency bands specified across these frequency regions may vary by country or regulatory agency.

[0085] The wireless communication system 100 can utilize both licensed RF spectrum bands and unlicensed RF spectrum bands. For example, the wireless communication system 100 can use unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology. When operating using unlicensed RF spectrum bands, devices such as network entities 105 and UE 115 can use carrier sensing for conflict detection and avoidance. In some examples, operations performed using unlicensed bands can be based on carrier aggregation configuration (e.g., LAA) in combination with component carriers operating using licensed bands. Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0086] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a set of multiple rows and columns of antenna ports that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0087] The network entity 105 or UE 115 may use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. For example, multiple signals may be sent by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technologies include: single-user MIMO (SU-MIMO), for which multiple spatial layers are sent to the same receiving device; and multi-user MIMO (MU-MIMO), for which multiple spatial layers are sent to multiple devices.

[0088] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals conveyed via antenna elements of an antenna array so that some signals propagating along a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals conveyed via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other orientation).

[0089] The network entity 105 or UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the network entity 105 along different directions. For example, the network entity 105 may send signals according to different sets of beamforming weights associated with different transmission directions. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device (such as network entity 105), or by a receiving device (such as UE 115)) beam directions for later transmission or reception by the network entity 105.

[0090] Some signals, such as data signals associated with a particular receiving device, may be sent by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., a direction associated with a receiving device (such as receiving network entity 105 or receiving UE 115)). In some examples, the beam direction associated with the transmission along the single beam direction may be determined based on signals sent along one or more beam directions. For example, UE 115 may receive one or more of the signals sent by network entity 105 along different directions, and may report to network entity 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0091] In some examples, transmission by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more subbands. Network entity 105 may send reference signals (e.g., cell-specific reference signals (CRS), CSI-RS) that may be precoded or uncoded. UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent along one or more directions by a network entity 105 (e.g., base station 140, RU 170), UE 115 may use similar techniques to send signals multiple times along different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115), or to send signals along a single direction (e.g., to send data to a receiving device).

[0092] A receiving device (e.g., UE 115) may perform receiving operations according to multiple receiving configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a receiving device (e.g., network entity 105). For example, the receiving device may perform reception according to multiple receiving directions by: receiving via different antenna subarrays, processing the received signals according to different antenna subarrays, receiving according to different receiving beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing the received signals according to different receiving beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0093] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly to communicate via logical channels. The MAC layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection that supports a radio bearer for user plane data between the UE 115 and the network entity 105 or the core network 130. The PHY layer may map a transport channel to a physical channel.

[0094] UE 115 and network entity 105 may support retransmission of data to increase the likelihood of data being successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood of correctly receiving data via a communication link (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific time slot for data received via a previous symbol in the time slot. In some other examples, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0095] In the wireless communication system 100, the UE 115 may communicate with the network via two or more TRPs. The wireless communication system 100 may apply a unified TCI state framework. In some cases, three types of unified TCI states may be defined. The first type of TCI state (e.g., type 1) may include a joint TCI state for indicating a common beam for at least one downlink channel or reference signal and at least one uplink channel or reference signal (e.g., including a UE-specific physical downlink control channel (PDCCH), a UE-specific physical downlink shared channel (PDSCH), a UE-specific physical uplink control channel (PUCCH), and a UE-specific physical uplink shared channel (PUSCH)). The second type of TCI state (e.g., type 2) may include a downlink TCI state for indicating a common beam for more than one downlink channel or reference signal (e.g., including at least a UE-specific PDCCH and a UE-specific PDSCH). A third type of TCI state (e.g., type 3) may include an uplink TCI state for indicating a common beam for more than one uplink channel or reference signal (e.g., including at least a UE-specific PUCCH and a UE-specific PUSCH). For example, the network may indicate to UE 115 multiple downlink or uplink states for multiple TRPs.

[0096] In some cases, in order to facilitate simultaneous multi-panel uplink transmission to achieve higher uplink throughput and reliability (e.g., focusing on FR2 and multiple TRPs), an uplink pre-coding indication for PUSCH may be specified, where no new codebook is introduced for simultaneous transmission of multiple panels. In some cases, considering multi-TRP operation based on single DCI and multiple DCI, the total number of layers across all panels may be up to four and the total number of codewords across all panels may be up to two. In some cases, in order to facilitate simultaneous multi-panel uplink transmission to achieve higher uplink throughput and reliability (e.g., focusing on FR2 and multiple TRPs), an uplink beam indication for PUCCH or PUSCH may be specified, where considering multi-TRP operation based on single DCI and multiple DCI, a unified TCI framework may be assumed. For the case of multi-TRP operation based on multiple DCI, in some examples, only PUSCH+PUSCH or PUCCH+PUCCH may be transmitted in the same component carrier across two panels. In some cases, the timing advance of uplink multi-DCI for multi-TRP operation may be specified. In some cases, power control for an uplink single DCI for multi-TRP operation may be applied.

[0097] In multi-TRP operation, each TRP may be associated with a TCI state, which may be indicated by the network to the UE 115. A UE 115 communicating with a network in multi-TPR operation may send or receive reference signals via multiple TRPs. In some cases, a reference signal such as an SRS or CSI-RS may be indicated using a beam different from a beam used for another channel, such as a PDCCH, PDSCH, PUSCH, or PUCCH. In some cases, a reference signal such as an SRS or CSI-RS associated with a TRP for a UE 115 in multi-TRP operation may be indicated using a beam associated with another TRP.

[0098] In some cases, a UE that has established a communication link with a network by two or more TRPs may receive scheduling information for a reference signal (e.g., SRS or CSI-RS) set. The UE 115 may identify the TCI state to be applied to each reference signal in the reference signal set, and then communicate with the network according to the corresponding TCI state identified for each reference signal in the reference signal set. In some cases, the TCI state to be applied to each corresponding reference signal in the reference signal set may be indicated by control signaling (e.g., RRC signaling, MAC-CE, or DCI message). In some cases, the control signaling (e.g., DCI message) for scheduling or activating a reference signal set may indicate the TCI state to be applied to each reference signal in the reference signal set. In some cases, the TCI state to be applied to each reference signal in the reference signal set may be based on the TRP associated with each reference signal in the corresponding reference signal (e.g., which may be indicated in the control signaling for scheduling or activating the reference signal set). In some cases, the UE 115 may determine the TCI state to be applied to each corresponding reference signal in the reference signal set based on the configured rules. For example, a rule may define which TCI state applies to which reference signal based on the order of the reference signals.

[0099] Figure 2An example of a network architecture 200 (e.g., a decomposed base station architecture, a decomposed RAN architecture) that supports TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated. The network architecture 200 may illustrate an example for implementing one or more aspects of the wireless communication system 100. The network architecture 200 may include one or more CUs 160-a, which may communicate directly with the core network 130-a via a backhaul communication link 120-a, or indirectly communicate with the core network 130-a through one or more decomposed network entities 105 (e.g., a near-RT RIC 175-b via an E2 link, or a non-RT RIC 175-a associated with an SMO 180-a (e.g., an SMO framework), or both. The CU 160-a may communicate with one or more DUs 165-a via a corresponding midhaul communication link 162-a (e.g., an F1 interface). The DU 165-a may communicate with one or more RUs 170-a via corresponding fronthaul communication links 168-a. The RU 170-a may be associated with a corresponding coverage area 110-a and may communicate with the UE 115-a via one or more communication links 125-a. In some implementations, the UE 115-a may be served by multiple RUs 170-a simultaneously.

[0100] Each of the network entities 105 of the network architecture 200 (e.g., CU 160-a, DU 165-a, RU 170-a, non-RT RIC 175-a, near-RT RIC 175-b, SMO 180-a, open cloud (O-Cloud) 205, open eNB (O-eNB) 210) may include one or more interfaces or may be coupled to one or more interfaces configured to receive or send signals (e.g., data, information) via a wired or wireless transmission medium. Each network entity 105 or an associated processor (e.g., a controller) that provides instructions to an interface of the network entity 105 may be configured to communicate with one or more of the other network entities 105 via a transmission medium. For example, these network entities 105 may include a wired interface that is configured to receive signals on a wired transmission medium or to send signals to one or more of the other network entities 105 on a wired transmission medium. Additionally or alternatively, the network entity 105 may include a wireless interface, which may include a receiver, a transmitter, or a transceiver (e.g., an RF transceiver) configured to receive signals on a wireless transmission medium, or to send signals to one or more of the other network entities 105 on a wireless transmission medium, or both.

[0101] In some examples, CU 160-a may host one or more higher layer control functions. Such control functions may include RRC, PDCP, SDAP, etc. Each control function may be implemented with an interface configured to communicate signals with other control functions hosted by CU 160-a. CU 160-a may be configured to handle user plane functionality (e.g., CU-UP), control plane functionality (e.g., CU-CP), or a combination thereof. In some examples, CU 160-a may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface such as an E1 interface. As needed, CU 160-a may be implemented to communicate with DU 165-a for network control and signaling.

[0102] DU 165-a may correspond to a logical unit that includes one or more functions (e.g., base station functions, RAN functions) for controlling the operation of one or more RUs 170-a. In some examples, DU 165-a may at least partially host one or more of the RLC layer, the MAC layer, and one or more aspects of the PHY layer (e.g., a high PHY layer, such as modules for FEC encoding and decoding, scrambling, modulation and demodulation, etc.), which depends at least in part on functional splits, such as those defined by the Third Generation Partnership Project (3GPP). In some examples, DU 165-a may also host one or more low PHY layers. Each layer may be implemented using an interface that is configured to communicate signals with other layers hosted by DU 165-a or with control functions hosted by CU 160-a.

[0103] In some examples, lower layer functionality may be implemented by one or more RUs 170-a. For example, a RU 170-a controlled by a DU 165-a may correspond to a logical node that hosts RF processing functions or low PHY layer functions (e.g., performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.) or both based at least in part on functional splitting (such as lower layer functional splitting). In such an architecture, RU 170-a may be implemented to handle over-the-air (OTA) communications with one or more UEs 115-a. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with RU 170-a may be controlled by corresponding DU 165-a. In some examples, such a configuration may enable DU 165-a and CU160-a to be implemented in a cloud-based RAN architecture (such as a vRAN architecture).

[0104] The SMO 180-a may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network entities 105. For non-virtualized network entities 105, the SMO 180-a may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (e.g., an O1 interface). For virtualized network entities 105, the SMO 180-a may be configured to interact with a cloud computing platform (e.g., O-Cloud 205) to perform network entity lifecycle management (e.g., instantiating virtualized network entities 105) via a cloud computing platform interface (e.g., an O2 interface). Such virtualized network entities 105 may include, but are not limited to, CU 160-a, DU 165-a, RU 170-a, and near-RT RIC 175-b. In some specific implementations, the SMO 180-a may communicate (e.g., via an O1 interface) with components configured according to a 4G RAN. Additionally or alternatively, in some implementations, the SMO 180-a may communicate directly with one or more RUs 170-a via an O1 interface. The SMO 180-a may also include a non-RT RIC 175-a configured to support the functionality of the SMO 180-a.

[0105] The non-RT RIC 175-a may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) or machine learning (ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 175-b. The non-RT RIC 175-a may be coupled to or communicate with the near-RT RIC 175-b (e.g., via an A1 interface). The near-RT RIC 175-b may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions on an interface (e.g., via an E2 interface) that connects one or more CUs 160-a, one or more DUs 165-a, or both, and the O-eNB 210 with the near-RT RIC 175-b.

[0106] In some examples, in order to generate an AI / ML model to be deployed in the near-RT RIC 175-b, the non-RT RIC 175-a may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 175-b and may be received from a non-network data source or from a network function at the SMO 180-a or the non-RT RIC 175-a. In some examples, the non-RT RIC 175-a or the near-RT RIC 175-b may be configured to tune RAN behavior or performance. For example, the non-RT RIC 175-a may monitor long-term trends and patterns of performance and employ an AI model or ML model to perform corrective actions through the SMO 180-a (e.g., via reconfiguration of O1) or via the generation of a RAN management policy (e.g., an A1 policy).

[0107] In some examples, UE 115-a may communicate with the network via multiple TRPs (e.g., UE 115-a may operate in multi-TRP mode). As described herein, a TRP may include RU 170-a, DU 165-a, or a combination thereof.

[0108] Figure 3 An example of a wireless communication system 300 that supports TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated. In some examples, the wireless communication system 300 can implement aspects of the wireless communication system 100. The wireless communication system 300 can include a UE 115-b, which can be an example of a UE 115 as described herein. The wireless communication system 300 can include a network entity 105-a, which can be an example of a network entity 105 as described herein.

[0109] UE 115-b may operate in a multi-TRP mode with a first TRP 305-a and a second TRP 305-b. In some cases, the first TRP 305-a and the second TRP 305-b may be located at the same network entity 105-a. In some cases, the first TRP 305-a and the second TRP 305-b may be located at different network entities.

[0110] UE 115-b may be able to perform simultaneous communication with a first TRP 305-a and a second TRP 305-b (e.g., using the same set of time resources or the same set of frequency resources or both, but different spatial resources). UE 115-b may use communication link 125-b to communicate with the first TRP 305-a. UE 115-b may use communication link 125-c to communicate with the second TRP 305-b. Communication link 125-b and communication link 125-c may include a bidirectional link that implements both uplink communication and downlink communication. For example, UE 115-b may use communication link 125-b to send an uplink signal 330-a such as an uplink control signal or an uplink data signal to the first TRP 305-a, and the first TRP 305-a may use communication link 125-b to send a downlink signal 335-a such as a downlink control signal or a downlink data signal to UE 115-b. UE 115-b may use communication link 125-c to send an uplink signal 330-b such as an uplink control signal or an uplink data signal to a second TRP 305-b, and the second TRP 305-b may use communication link 125-c to send a downlink signal 335-b such as a downlink control signal or a downlink data signal to UE 115-b. In some examples, different TRPs (e.g., a first TRP 305-a and a second TRP 305-b) may have different TRP identifiers (IDs). In some examples, different TRPs may be identified by association with other IDs such as a CORESET pool index, a closed loop index, a TCI ID, a TCI group ID, or an SRS resource set ID.

[0111] In single DCI multi-TRP operation or multi-DCI multi-TRP operation, UE 115-b may communicate with the first TRP 305-a and the second TRP 305-b using space division multiplexing, frequency division multiplexing, or time division multiplexing, or a combination thereof. The wireless communication system may support DCI repetition (e.g., across CORESETs associated with the first TRP 305-a and the second TRP 305-b), PUSCH and PUCCH repetition, downlink single frequency network (SFN) configuration, or uplink SFN configuration. For example, in the downlink, UE 115-b may receive PDSCH or PDCCH messages based on the SFN configuration. For example, UE 115-b may receive the same downlink signal (e.g., PDSCH or PDCCH message) from the first TRP 305-a and the second TRP 305-b on different beams using different antenna panels at UE 115-b. In the uplink, UE 115-b may send PUSCH or PUCCH messages depending on the SFN configuration. For example, UE 115-b may send the same uplink signal to the first TRP 305-a and the second TRP 305- on different beams using different antenna panels at UE 115-b.

[0112] UE 115-b may indicate or be configured with a pair of uplink applicable TCI states (e.g., joint or uplink TCI states) for a multi-TRP operation uplink transmission (e.g., PUCCH or PUSCH) to a first TRP 305-a and a second TRP 305-b. UE 115-b may receive scheduling information 310 for a reference signal set 315.

[0113] For example, UE 115-b may be activated via MAC-CE using a semi-persistent CSI-RS or SRS set. In some cases, UE 115-b (and network entity 105-a) may determine the TCI state to be applied to each reference signal in reference signal set 315 based on control signaling 320. For example, the TCI state for the reference signal may be configured via RRC signaling. In some cases, RRC signaling may include a field "followingUnifiedTCIforTRPA", which may indicate the use of the indicated TCI state associated with the first TRP 305-a, or RRC signaling may include a field "followingUnifiedTCIforTRPB", which may indicate the use of the indicated TCI state associated with the second TRP 305-b. In some cases, the RRC signaling may indicate the use of a configured TCI state that is not an indicated TCI state for a PUSCH or PUCCH for the first TRP 305-a or the second TRP 305-b. In some cases, the RRC signaling may indicate the use of a default TCI state, which in some examples may follow the TCI state of a control source set (CORESET) associated with a MAC-CE that activates a reference signal set (e.g., a CORESET with a DCI that schedules a PDSCH using a MAC-CE). In some cases, the control signaling 320 may be a MAC-CE that activates a TCI state for a reference signal or activates a channel state information (CSI) report associated with a reference signal. For example, the MAC-CE may include a field "followingUnifiedTCIforTRPA", which may indicate the use of an indicated TCI state associated with the first TRP 305-a, or the MAC-CE may include a field "followingUnifiedTCIforTRPB", which may indicate the use of an indicated TCI state associated with the second TRP 305-b. In some cases, the MAC-CE may indicate the use of a configured TCI state that is not the indicated TCI state for the PUSCH or PUCCH of the first TRP 305-a or the second TRP 305-b. In some cases, the MAC-CE may replace or overwrite a previous indication of a corresponding TCI state for the reference signal set 315 (e.g., which may have been indicated by RRC signaling).

[0114] In some cases, for the semi-persistent reference signal set 315, the TCI state to be applied to each reference signal in the reference signal set 315 may be based on the configured rules. For example, the TCI state to be applied to each reference signal in the reference signal set 315 may be based on the order of the reference signals. For example, if there are two SRS sets configured for non-codebook or codebook-based MIMO configuration, the first SRS set for non-codebook or codebook-based MIMO may follow the indicated TCI state for the first TRP 305-a, and the second SRS set for non-codebook or codebook-based MIMO may follow the indicated TCI state for the second TRP 305-b. As another example, if there are multiple CSI-RS sets associated with one CSI report, the first CSI-RS set and the second CSI-RS set may follow the indicated TCI states for the first TRP 305-a and the second TRP 305-b, respectively.

[0115] In some cases, the UE 115-b may be activated or triggered using a set 315 of semi-persistent or non-periodic reference signals (e.g., SRS or CSI-RS) via a DCI message 325. In some cases, the UE 115-b (and the network entity 105-a) may determine the TCI state to be applied to each reference signal in the set 315 of reference signals based on the control signaling 320. For example, the TCI state for the reference signal may be configured via RRC signaling or MAC-CE signaling. In some cases, the RRC signaling or MAC-CE signaling may include a field "followingUnifiedTCIforTRPA", which may indicate the use of the indicated TCI state associated with the first TRP 305-a, or the RRC signaling or MAC-CE signaling may include a field "followingUnifiedTCIforTRPB", which may indicate the use of the indicated TCI state associated with the second TRP 305-b. In some cases, RRC signaling or MAC-CE signaling may indicate the use of a configured TCI state that is not the indicated TCI state for the PUSCH or PUCCH of the first TRP 305-a or the second TRP 305-b. In some cases, the scheduling / activation DCI message 325 may indicate the TCI state to be applied to each reference signal in the reference signal set 315. In some cases, the DCI message 325 may include a field "followingUnifiedTCIforTRPA", which may indicate the use of the indicated TCI state associated with the first TRP 305-a, or the DCI message 325 may include a field "followingUnifiedTCIforTRPB", which may indicate the use of the indicated TCI state associated with the second TRP 305-b. In some cases, the DCI message 325 may indicate a TCI state to apply the DCI message 325, where the TCI state of the CORESET used to receive the DCI message 325 is applied to the activated or scheduled reference signal. In some cases, when no other indication of which TCI state to apply is provided, the UE 115-b may apply the TCI state of the CORESET used to receive the DCI message 325 to the activated or scheduled reference signal.

[0116] In some cases, for a semi-persistent or non-periodic reference signal 315 activated or triggered by a DCI message 325, the TCI state to be applied to each reference signal in the reference signal set 315 may be based on a configured rule. For example, the TCI state to be applied to each reference signal in the reference signal set 315 may be based on the order of the reference signal. For example, if there are two SRS sets configured for non-codebook or codebook-based MIMO, the first SRS set for non-codebook or codebook-based MIMO may follow the indicated TCI state for the first TRP 305-a, and the second SRS set for non-codebook or codebook-based MIMO may follow the indicated TCI state for the second TRP 305-b. As another example, if there are two CSI-RS sets associated with one CSI report, the first CSI-RS set and the second CSI-RS set for the same CSI report may follow the indicated TCI state for the first TRP 305-a and the second TRP 305-b, respectively.

[0117] In some cases, for a semi-persistent or non-periodic reference signal 315 activated or triggered by a DCI message 325, the UE 115-b may identify the TCI state to be applied to each reference signal in the reference signal set 315 based on a TRP selection indicator field in the DCI message 325. For example, the TRP selection indicator field may be configured in the DCI message 325 and indicate that {TCI1}, {TCI2}, {TCI1 and TCI2}, or {TCI2 and TCI1} are to be applied to any one of PDSCH, PUSCH, PDCCH, and PUCCH (e.g., where TCI1 refers to the TCI state associated with the first TRP 305-a, and TCI2 refers to the TCI state associated with the second TRP 305-b). The TRP selection indicator field used for other channels (e.g., PDSCH, PUSCH, PDCCH, or PUCCH) may be reused for the triggered or activated reference signal. In some examples, the TRP selection indicator field may be reused when uplink or downlink data is not scheduled. For example, DCI message 325 may activate or trigger SRS or CSI-RS without scheduling PDSCH or PUSCH, and the TRP selection indicator field may indicate the TCI state for the activated or triggered SRS or CSI-RS. In some cases, the TRP selection indicator field may be reused even when downlink or uplink data is scheduled via DCI message 325. UE 115-b may apply the selected TCI state to both data transmissions and reference signals in reference signal set 315.

[0118] Figure 4An example of a process flow 400 for supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated. The process flow 400 may include a UE 115-c, which may be an example of a UE 115 as described herein. The process flow 400 may include a network entity 105-b, which may be an example of a network entity 105 as described herein. In the following description of the process flow 400, operations between the network entity 105-b and the UE 115-c may be sent in an order different from the example order shown, or operations performed by the network entity 105-b and the UE 115-c may be performed in a different order or at different times. Some operations may also be omitted from the process flow 400, and other operations may be added to the process flow 400.

[0119] At 405, UE 115-c may establish a communication link with network entity 105-b via the first TRP and the second TRP.

[0120] At 410 , the UE 115 - c may receive scheduling information for a set of reference signals from the network entity 105 - b .

[0121] At 415, UE 115-c and network entity 105-b may identify a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. In some examples, UE 115-c may receive control signaling indicating a corresponding TCI state for each reference signal in the reference signal set. In some examples, UE 115-c and network entity 105-b may identify a first TCI state associated with a first TRP and a second TCI state associated with a second TRP, and identifying a corresponding TCI state for each reference signal in the reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set. In some cases, identifying the TCI state for each reference signal in the reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set based on an order of the reference signal set.

[0122] At 420, the UE 115-c may communicate with the network entity 105-b based on the respective TCI states identified for each reference signal in the set of reference signals. In some cases, the set of reference signals is a set of SRSs, and the communication includes sending the SRS from the UE 115-c to the network entity 105-b based on the respective TCI states identified for each SRS in the set of SRSs. In some cases, the set of reference signals is a set of CSI-RSs, and the communication includes sending the CSI-RS from the network entity 105-b to the UE 115-c based on the respective TCI states identified for each CSI-RS in the set of CSI-RSs.

[0123] Figure 5 An example of a process flow 500 for supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is illustrated. The process flow 500 may include a UE 115-d, which may be an example of a UE 115 as described herein. The process flow 500 may include a network entity 105-c, which may be an example of a network entity 105 as described herein. In the following description of the process flow 500, operations between the network entity 105-c and the UE 115-d may be sent in an order different from the example order shown, or operations performed by the network entity 105-c and the UE 115-d may be performed in a different order or at a different time. Some operations may also be omitted from the process flow 500, and other operations may be added to the process flow 500.

[0124] At 505, UE 115-d may establish a communication link with network entity 105-c via the first TRP and the second TRP.

[0125] At 510 , the UE 115 - d may receive scheduling information for a set of reference signals from the network entity 105 - c .

[0126] At 515 , the UE 115 - d may receive control signaling from the network entity 105 - c indicating a respective TCI state for each reference signal in the set of reference signals.

[0127] In some cases, the UE 115-d and the network entity 105-c may identify a first TCI state associated with a first TRP and a second TCI state associated with a second TRP, and the control signaling indicates one of the following for each reference signal: the first TCI state, the second TCI state, or a different TCI state.

[0128] In some cases, UE 115-d may utilize control signaling to receive an indication of whether the corresponding TCI state corresponds to a first corresponding transmit indicator state or to a corresponding different transmit indicator state based on the association of each reference signal with a first TRP or a second TRP for each reference signal in the reference signal set.

[0129] In some cases, UE 115-d may receive control signaling via MAC-CE, and the control signaling may replace a previous indication of a corresponding TCI state for a reference signal set (e.g., which may have been configured in RRC signaling). In some examples, UE 115-d may receive control signaling via RRC signaling.

[0130] In some cases, the control signaling may be a DCI message that includes a corresponding TRP indicator field for each reference signal in a reference signal set, and identifies a corresponding TCI state for each reference signal in the reference signal set based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0131] At 520, based on the control signaling at 515, the UE 115-d and the network entity 105-c may identify a corresponding TCI state for each reference signal according to an association of each reference signal in the reference signal set with the first TRP or the second TRP.

[0132] At 525, the UE 115-d may communicate with the network entity 105-c based on the respective TCI state identified for each reference signal in the set of reference signals. In some cases, the set of reference signals is a set of SRSs, and the communicating includes sending the SRS from the UE 115-d to the network entity 105-c based on the respective TCI state identified for each SRS in the set of SRSs. In some cases, the set of reference signals is a set of CSI-RSs, and the communicating includes sending the CSI-RS from the network entity 105-c to the UE 115-d based on the respective TCI state identified for each CSI-RS in the set of CSI-RSs.

[0133] Figure 6 A block diagram 600 of a device 605 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The device 605 may be an example of aspects of the UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0134] The receiver 610 may provide means for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels related to TCI state selection for reference signals in multi-TRP operation, data channels, information channels). The information may be communicated to other components of the device 605. The receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0135] The transmitter 615 may provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels related to TCI state selection for reference signals in multi-TRP operation, data channels, information channels). In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0136] The communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of TCI state selection for reference signals in multi-TRP operation as described herein. For example, the communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0137] In some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured to or otherwise supports components for performing the functions described herein. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0138] Additionally or alternatively, in some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functionality described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0139] In some examples, communication manager 620 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 610, transmitter 615, or both. For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated in conjunction with receiver 610, transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0140] According to the examples disclosed herein, the communication manager 620 may support wireless communication at the UE. For example, the communication manager 620 may be configured to or otherwise support components for establishing a communication link with the network via a first TRP and a second TRP. The communication manager 620 may be configured to or otherwise support components for receiving scheduling information for a reference signal set. The communication manager 620 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The communication manager 620 may be configured to or otherwise support components for communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0141] By including or configuring a communication manager 620 according to the examples described herein, the device 605 (e.g., a processor controlling the receiver 610, the transmitter 615, the communication manager 620, or a combination thereof or otherwise coupled thereto) may support techniques for more efficiently utilizing communication resources by determining TCI states to be applied to communications of reference signals in multi-TRP operations.

[0142] Figure 7A block diagram 700 of a device 705 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0143] The receiver 710 may provide means for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels related to TCI state selection for reference signals in multi-TRP operation, data channels, information channels). The information may be communicated to other components of the device 705. The receiver 710 may utilize a single antenna or a collection of multiple antennas.

[0144] The transmitter 715 may provide means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels related to TCI state selection for reference signals in multi-TRP operation, data channels, information channels). In some examples, the transmitter 715 may be co-located with the receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0145] The device 705 or its various components may be examples of components for performing various aspects of TCI state selection for reference signals in multi-TRP operations as described herein. For example, the communication manager 720 may include a multi-TRP communication link manager 725, a reference signal scheduling manager 730, a reference signal TCI state manager 735, a reference signal communication manager 740, or any combination thereof. The communication manager 720 may be an example of various aspects of the communication manager 620 as described herein. In some examples, the communication manager 720 or its various components may be configured to use or otherwise cooperate with the receiver 710, the transmitter 715, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, the communication manager 720 may receive information from the receiver 710, transmit information to the transmitter 715, or be integrated with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.

[0146] According to the examples disclosed herein, the communication manager 720 may support wireless communication at the UE. The multi-TRP communication link manager 725 may be configured to or otherwise support components for establishing a communication link with the network via a first TRP and a second TRP. The reference signal scheduling manager 730 may be configured to or otherwise support components for receiving scheduling information for a reference signal set. The reference signal TCI state manager 735 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The reference signal communication manager 740 may be configured to or otherwise support components for communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0147] Figure 8 A block diagram 800 of a communication manager 820 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The communication manager 820 may be an example of various aspects of the communication manager 620, the communication manager 720, or both as described herein. The communication manager 820 or its various components may be examples of components for performing various aspects of TCI state selection for reference signals in multi-TRP operation as described herein. For example, the communication manager 820 may include a multi-TRP communication link manager 825, a reference signal scheduling manager 830, a reference signal TCI state manager 835, a reference signal communication manager 840, a DCI manager 845, a TRP TCI state manager 850, an SRS manager 855, a CSI-RS manager 860, a MAC-CE manager 865, an RRC manager 870, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0148] According to the examples disclosed herein, the communication manager 820 may support wireless communication at the UE. The multi-TRP communication link manager 825 may be configured to or otherwise support components for establishing a communication link with the network via a first TRP and a second TRP. The reference signal scheduling manager 830 may be configured to or otherwise support components for receiving scheduling information for a reference signal set. The reference signal TCI state manager 835 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The reference signal communication manager 840 may be configured to or otherwise support components for communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0149] In some examples, reference signal TCI state manager 835 may be configured or otherwise support components for receiving control signaling indicating a respective TCI state for each reference signal in a reference signal set.

[0150] In some examples, the TRP TCI state manager 850 may be configured as or otherwise support components for identifying a first TCI state associated with a first TRP and a second TCI state associated with a second TRP, wherein control signaling indicates one of the following for each reference signal: a first TCI state, a second TCI state, or a different TCI state.

[0151] In some examples, the reference signal TCI state manager 835 may be configured as or otherwise support components for utilizing control signaling to receive, for each reference signal in a reference signal set, an indication of whether the corresponding TCI state corresponds to a first corresponding transmit indicator state or to a corresponding different transmit indicator state based on an association of each reference signal with a first TRP or a second TRP.

[0152] In some examples, to support receiving control signaling, MAC-CE manager 865 may be configured or otherwise support components for receiving control signaling via MAC-CE, where the control signaling replaces a previous indication of a corresponding TCI state for a reference signal set.

[0153] In some examples, to support receiving control signaling, RRC manager 870 may be configured or otherwise support components for receiving control signaling via radio resource control messages.

[0154] In some examples, the DCI manager 845 may be configured to or otherwise support components for receiving a DCI message that includes a corresponding TRP indicator field for each reference signal in a reference signal set, wherein identifying a corresponding TCI state for each reference signal in the reference signal set is based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0155] In some examples, the TRP TCI state manager 850 may be configured as or otherwise support components for identifying a first TCI state associated with a first TRP and a second TCI state associated with a second TRP, wherein identifying the corresponding TCI state for each reference signal in a reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set.

[0156] In some examples, to support identification of a TCI state for each reference signal in a reference signal set, the reference signal TCI state manager 835 may be configured as or otherwise support components for identifying one of a first TCI state or a second TCI state for each reference signal in the reference signal set based on an order of the reference signal set.

[0157] In some examples, to support communication with a network based on a corresponding TCI state identified for each reference signal in a reference signal set, where the reference signal set is an SRS set, the SRS manager 855 may be configured to or otherwise support components for sending an SRS set based on a corresponding TCI state identified for each SRS in the SRS set.

[0158] In some examples, to support communication with a network based on a corresponding TCI state identified for each reference signal in a reference signal set, where the reference signal set is a CSI-RS set, the CSI-RS manager 860 may be configured to or otherwise support components for receiving a CSI-RS set based on a corresponding TCI state identified for each CSI-RS in the CSI-RS set.

[0159] Fig. 9 A diagram of a system 900 including a device 905 that supports TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 as described herein or include components of these devices. The device 905 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, a code 935, and a processor 940. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 945).

[0160] I / O controller 910 can manage input signals and output signals of device 905. I / O controller 910 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 910 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 910 can utilize an operating system such as or another known operating system. Additionally or alternatively, I / O controller 910 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 910 may be implemented as part of a processor such as processor 940. In some cases, a user may interact with device 905 via I / O controller 910 or via hardware components controlled by I / O controller 910.

[0161] In some cases, the device 905 may include a single antenna 925. However, in some other cases, the device 905 may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bidirectionally via one or more antennas 925, a wired link, or a wireless link as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 915 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 925 for transmission, and for demodulating packets received from one or more antennas 925. The transceiver 915 or the transceiver 915 and one or more antennas 925 may be examples of transmitters 615, transmitters 715, receivers 610, receivers 710, or any combination thereof or components thereof as described herein.

[0162] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed by the processor 940, cause the device 905 to perform various functions described herein. The code 935 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 935 may not be directly executable by the processor 940, but may (for example, when compiled and executed) cause the computer to perform the functions described herein. In some cases, in addition to this, the memory 930 may also include a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0163] The processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 930) to enable the device 905 to perform various functions (e.g., functions or tasks to support TCI state selection for reference signals in multi-TRP operations). For example, the device 905 or a component of the device 905 may include a processor 940 and a memory 930 coupled to or coupled to the processor 940, and the processor 940 and the memory 930 are configured to perform the various functions described herein.

[0164] According to the examples disclosed herein, the communication manager 920 may support wireless communication at the UE. For example, the communication manager 920 may be configured to or otherwise support components for establishing a communication link with the network via a first TRP and a second TRP. The communication manager 920 may be configured to or otherwise support components for receiving scheduling information for a reference signal set. The communication manager 920 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The communication manager 920 may be configured to or otherwise support components for communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0165] By including or configuring a communication manager 920 according to the examples described herein, the device 905 may support techniques for improving communication reliability, more efficiently utilizing communication resources, and improving coordination between devices by determining TCI states to be applied to communications of reference signals in multi-TRP operations.

[0166] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 915, one or more antennas 925, or any combination thereof. Although the communication manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 920 may be supported or performed by the processor 940, the memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions executable by the processor 940 to cause the device 905 to perform various aspects of TCI state selection for reference signals in multi-TRP operation as described herein, or the processor 940 and the memory 930 may be otherwise configured to perform or support such operations.

[0167] Fig.10 A block diagram 1000 of a device 1005 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the network entity 105 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0168] Receiver 1010 may provide means for obtaining (e.g., receiving, determining, identifying) information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). The information may be communicated to other components of device 1005. In some examples, receiver 1010 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1010 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical) interfaces, wireless interfaces, or any combination thereof.

[0169] The transmitter 1015 may provide means for outputting (e.g., sending, providing, conveying, transmitting) information generated by other components of the device 1005. For example, the transmitter 1015 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, the transmitter 1015 may support outputting information by sending signals via one or more antennas. Additionally or alternatively, the transmitter 1015 may support outputting information by sending signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1015 and the receiver 1010 may be co-located in a transceiver, which may include a modem or be coupled to the modem.

[0170] The communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of TCI state selection for reference signals in multi-TRP operation as described herein. For example, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0171] In some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured as or otherwise supports components for performing the functions described herein. In some examples, a processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0172] Additionally or alternatively, in some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functions of the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functions described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0173] In some examples, communication manager 1020 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 1010, transmitter 1015, or both. For example, communication manager 1020 may receive information from receiver 1010, transmit information to transmitter 1015, or be integrated in conjunction with receiver 1010, transmitter 1015, or both to obtain information, output information, or perform various other operations as described herein.

[0174] According to the examples disclosed herein, the communication manager 1020 may support wireless communications at a network entity. For example, the communication manager 1020 may be configured to or otherwise support components for establishing a communication link with a UE via a first TRP and a second TRP. The communication manager 1020 may be configured to or otherwise support components for sending scheduling information for a reference signal set to the UE. The communication manager 1020 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The communication manager 1020 may be configured to or otherwise support components for communicating with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0175] By including or configuring a communication manager 1020 according to the examples described herein, the device 1005 (e.g., a processor controlling the receiver 1010, the transmitter 1015, the communication manager 1020, or a combination thereof or otherwise coupled thereto) may support techniques for more efficiently utilizing communication resources by determining TCI states to be applied to communications of reference signals in multi-TRP operations.

[0176] Fig.11 A block diagram 1100 of a device 1105 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or network entity 105 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0177] Receiver 1110 may provide means for obtaining (e.g., receiving, determining, identifying) information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). The information may be communicated to other components of device 1105. In some examples, receiver 1110 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1110 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0178] The transmitter 1115 may provide means for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of the device 1105. For example, the transmitter 1115 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, the transmitter 1115 may support outputting information by sending signals via one or more antennas. Additionally or alternatively, the transmitter 1115 may support outputting information by sending signals via one or more wired (e.g., electrical, optical) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1115 and the receiver 1110 may be co-located in a transceiver, which may include a modem or be coupled to the modem.

[0179] The device 1105 or its various components may be examples of components for performing various aspects of TCI state selection for reference signals in multi-TRP operations as described herein. For example, the communication manager 1120 may include a multi-TRP communication link manager 1125, a reference signal scheduling manager 1130, a reference signal TCI state manager 1135, a reference signal communication manager 1140, or any combination thereof. The communication manager 1120 may be an example of various aspects of the communication manager 1020 as described herein. In some examples, the communication manager 1120 or its various components may be configured to use or otherwise cooperate with the receiver 1110, the transmitter 1115, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, the communication manager 1120 may receive information from the receiver 1110, transmit information to the transmitter 1115, or be integrated with the receiver 1110, the transmitter 1115, or both to obtain information, output information, or perform various other operations as described herein.

[0180] According to the examples disclosed herein, the communication manager 1120 may support wireless communication at a network entity. The multi-TRP communication link manager 1125 may be configured to or otherwise support components for establishing a communication link with a UE via a first TRP and a second TRP. The reference signal scheduling manager 1130 may be configured to or otherwise support components for sending scheduling information for a reference signal set to the UE. The reference signal TCI state manager 1135 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The reference signal communication manager 1140 may be configured to or otherwise support components for communicating with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0181] Fig.12 A block diagram 1200 of a communication manager 1220 supporting TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The communication manager 1220 may be an example of aspects of the communication manager 1020, the communication manager 1120, or both as described herein. The communication manager 1220 or its various components may be examples of components for performing various aspects of TCI state selection for reference signals in multi-TRP operation as described herein. For example, the communication manager 1220 may include a multi-TRP communication link manager 1225, a reference signal scheduling manager 1230, a reference signal TCI state manager 1235, a reference signal communication manager 1240, a DCI manager 1245, a TRP TCI state manager 1250, an SRS manager 1255, a CSI-RS manager 1260, a MAC-CE manager 1265, an RRC manager 1270, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses), which communication may include communication within a protocol layer of a protocol stack, communication associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with the network entity 105, between devices, components, or virtualized components associated with the network entity 105), or any combination thereof.

[0182] According to the examples disclosed herein, the communication manager 1220 may support wireless communication at a network entity. The multi-TRP communication link manager 1225 may be configured to or otherwise support components for establishing a communication link with a UE via a first TRP and a second TRP. The reference signal scheduling manager 1230 may be configured to or otherwise support components for sending scheduling information for a reference signal set to a UE. The reference signal TCI state manager 1235 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The reference signal communication manager 1240 may be configured to or otherwise support components for communicating with a UE via a first TRP and a second TRP based on a corresponding TCI state identified for each reference signal in the reference signal set.

[0183] In some examples, reference signal TCI state manager 1235 may be configured as or otherwise support components for sending control signaling to a UE indicating a respective TCI state for each reference signal in a reference signal set.

[0184] In some examples, the TRP TCI state manager 1250 may be configured as or otherwise support components for identifying a first TCI state associated with a first TRP and a second TCI state associated with a second TRP, wherein control signaling indicates one of the following for each reference signal: a first TCI state, a second TCI state, or a different TCI state.

[0185] In some examples, the reference signal TCI state manager 1235 may be configured as or otherwise support components for utilizing control signaling to send, for each reference signal in a reference signal set, an indication of whether the corresponding TCI state corresponds to a first corresponding transmit indicator state or to a corresponding different transmit indicator state based on an association of each reference signal with a first TRP or a second TRP.

[0186] In some examples, to support sending control signaling, MAC-CE manager 1265 may be configured or otherwise support components for sending control signaling via MAC-CE, where the control signaling replaces a previous indication of a corresponding TCI state for a reference signal set.

[0187] In some examples, RRC manager 1270 may be configured or otherwise support components for sending control signaling via RRC messages.

[0188] In some examples, the DCI manager 1245 may be configured to or otherwise support components for sending a DCI message to a UE that includes a corresponding TRP indicator field for each reference signal in a reference signal set, wherein identifying a corresponding TCI state for each reference signal in the reference signal set is based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0189] In some examples, the TRP TCI state manager 1250 may be configured as or otherwise support components for identifying a first TCI state associated with a first TRP and a second TCI state associated with a second TRP, wherein identifying the corresponding TCI state for each reference signal in a reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set.

[0190] In some examples, to support identification of a TCI state for each reference signal in a reference signal set, the reference signal TCI state manager 1235 may be configured as or otherwise support components for identifying one of a first TCI state or a second TCI state for each reference signal in the reference signal set based on an order of the reference signal set.

[0191] In some examples, to support communication with a UE based on a corresponding TCI state for each reference signal identifier in a reference signal set, where the reference signal set is an SRS set, the SRS manager 1255 may be configured to or otherwise support components for receiving an SRS set based on a corresponding TCI state for each SRS identifier in the SRS set.

[0192] In some examples, to support communication with a UE based on a corresponding TCI state identified for each reference signal in a reference signal set, where the reference signal set is a CSI-RS set, the CSI-RS manager 1260 may be configured to or otherwise support components for sending a CSI-RS set based on a corresponding TCI state identified for each CSI-RS in the CSI-RS set.

[0193] Fig.13A diagram of a system 1300 including a device 1305 that supports TCI state selection for reference signals in multi-TRP operation according to one or more aspects of the present disclosure is shown. The device 1305 may be an example of a device 1005, a device 1105, or a network entity 105 as described herein, or include components thereof. The device 1305 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, which communication may include communication through one or more wired interfaces, through one or more wireless interfaces, or any combination thereof. The device 1305 may include components that support output and acquisition of communications, such as a communication manager 1320, a transceiver 1310, an antenna 1315, a memory 1325, a code 1330, and a processor 1335. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1340).

[0194] The transceiver 1310 may support bidirectional communication via a wired link, a wireless link, or both as described herein. In some examples, the transceiver 1310 may include a wired transceiver and may communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some examples, the transceiver 1310 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some examples, the device 1305 may include one or more antennas 1315, which may be capable of sending or receiving wireless transmissions (e.g., concurrently). The transceiver 1310 may also include a modem for modulating a signal, providing the modulated signal for transmission (e.g., by one or more antennas 1315, by a wired transmitter), receiving the modulated signal (e.g., from one or more antennas 1315, from a wired receiver), and demodulating the signal. Where applicable, transceiver 1310 or transceiver 1310 and one or more antennas 1315 or wired interface may be examples of transmitter 1015, transmitter 1115, receiver 1010, receiver 1110, or any combination thereof or any components thereof as described herein. In some examples, the transceiver may be operable to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, fronthaul communication link 168).

[0195] Memory 1325 may include RAM and ROM. Memory 1325 may store computer-readable, computer-executable code 1330 including instructions that, when executed by processor 1335, cause device 1305 to perform various functions described herein. Code 1330 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1330 may not be directly executable by processor 1335, but may (e.g., when compiled and executed) cause a computer to perform the functions described herein. In some cases, memory 1325 may also include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0196] The processor 1335 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any combination thereof). In some cases, the processor 1335 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 1335. The processor 1335 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 1325) to enable the device 1305 to perform various functions (e.g., functions or tasks to support TCI state selection for reference signals in multi-TRP operations). For example, the device 1305 or a component of the device 1305 may include a processor 1335 and a memory 1325 coupled to the processor 1335, and the processor 1335 and the memory 1325 are configured to perform the various functions described herein. Processor 1335 can be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance) that can host functionality for performing functions of device 1305 (e.g., by executing code 1330).

[0197] In some examples, bus 1340 may support communications within (e.g., within) a protocol layer of a protocol stack. In some examples, bus 1340 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack), which may include communications performed within a component of device 1305 or between different components of device 1305 that may be co-located or located in different locations (e.g., where device 1305 may refer to a system in which one or more of communication manager 1320, transceiver 1310, memory 1325, code 1330, and processor 1335 may be located in one of these different components or divided between different components).

[0198] In some examples, network communications manager 1320 may manage aspects of communications with core network 130 (e.g., via one or more wired or wireless backhaul links). For example, communications manager 1320 may manage delivery of data communications for client devices such as one or more UEs 115. In some examples, communications manager 1320 may manage communications with other network entities 105 and may include a controller or scheduler for controlling communications with UE 115 in coordination with other network entities 105. In some examples, communications manager 1320 may support an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between network entities 105.

[0199] According to the examples disclosed herein, the communication manager 1320 may support wireless communication at a network entity. For example, the communication manager 1320 may be configured to or otherwise support components for establishing a communication link with a UE via a first TRP and a second TRP. The communication manager 1320 may be configured to or otherwise support components for sending scheduling information for a reference signal set to the UE. The communication manager 1320 may be configured to or otherwise support components for identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP. The communication manager 1320 may be configured to or otherwise support components for communicating with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0200] By including or configuring a communication manager 1320 according to the examples described herein, the device 1305 may support techniques for improving communication reliability, more efficiently utilizing communication resources, and improving coordination between devices by determining TCI states to be applied to communications of reference signals in multi-TRP operations.

[0201] In some examples, the communication manager 1320 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with the transceiver 1310, one or more antennas 1315 (e.g., where applicable), or any combination thereof. Although the communication manager 1320 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1320 may be supported or performed by the processor 1335, the memory 1325, the code 1330, the transceiver 1310, or any combination thereof. For example, the code 1330 may include instructions executable by the processor 1335 to cause the device 1305 to perform various aspects of TCI state selection for reference signals in multi-TRP operations as described herein, or the processor 1335 and the memory 1325 may be otherwise configured to perform or support such operations.

[0202] Fig.14 1400 for TCI state selection for reference signals in supporting multi-TRP operation according to one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE or a component thereof as described herein. Figures 1 to 9 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0203] At 1405, the method may include: establishing a communication link with the network via the first TRP and the second TRP. The operations of 1405 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Figure 8 The multi-TRP communication link manager 825 is used to execute.

[0204] At 1410, the method may include receiving scheduling information for a reference signal set. The operations of 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed by Figure 8 The reference signal scheduling manager 830 is used to execute.

[0205] At 1415, the method may include: identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP. The operations of 1415 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1415 may be performed by Figure 8 The reference signal TCI state manager 835 is used to perform the above operation.

[0206] At 1420, the method may include communicating with the network based on the respective TCI states identified for each reference signal in the reference signal set. The operations of 1420 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1420 may be performed by Figure 8 The reference signal communication manager 840 is used to perform the above operation.

[0207] Fig.15 1 is a flowchart illustrating a method 1500 for TCI state selection for a reference signal in supporting multi-TRP operation according to one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE or a component thereof as described herein. Figures 1 to 9 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0208] At 1505, the method may include: establishing a communication link with the network via the first TRP and the second TRP. The operations of 1505 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Figure 8 The multi-TRP communication link manager 825 is used to execute.

[0209] At 1510, the method may include receiving scheduling information for a reference signal set. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by Figure 8 The reference signal scheduling manager 830 is used to execute.

[0210] At 1515, the method may include receiving control signaling indicating a respective TCI state for each reference signal in the reference signal set. The operations of 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by Figure 8 The reference signal TCI state manager 835 is used to perform the above operation.

[0211] At 1520, the method may include identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP. The operations of 1520 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed by Figure 8 The reference signal TCI state manager 835 is used to perform the above operation.

[0212] At 1525, the method may include: communicating with the network according to the respective TCI state identified for each reference signal in the reference signal set. The operations of 1525 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1525 may be performed by the network as disclosed herein. Figure 8 The reference signal communication manager 840 is used to perform the above operation.

[0213] Fig.16 1 is a flowchart illustrating a method 1600 for TCI state selection for a reference signal in supporting multi-TRP operation according to one or more aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE or a component thereof as described herein. Figures 1 to 9 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0214] At 1605, the method may include: establishing a communication link with the network via the first TRP and the second TRP. The operations of 1605 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Figure 8 The multi-TRP communication link manager 825 is used to execute.

[0215] At 1610, the method may include receiving scheduling information for a reference signal set. The operations of 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed by Figure 8 The reference signal scheduling manager 830 is used to execute.

[0216] At 1615, the method may include receiving a DCI message including a corresponding TRP indicator field for each reference signal in the reference signal set. The operations of 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed by Figure 8 The DCI manager 845 is used to execute.

[0217] At 1620, the method may include: identifying a respective TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP, wherein identifying the respective TCI state for each reference signal in the reference signal set is based on a respective TRP indicator field for each reference signal in the reference signal set. The operations of 1620 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1620 may be performed by Figure 8The reference signal TCI state manager 835 is used to perform the above operation.

[0218] At 1625, the method may include: communicating with the network according to the respective TCI state identified for each reference signal in the reference signal set. The operations of 1625 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1625 may be performed by the network as disclosed herein. Figure 8 The reference signal communication manager 840 is used to perform the above operation.

[0219] Fig.17 1 is a flowchart illustrating a method 1700 for supporting TCI state selection for a reference signal in a multi-TRP operation according to one or more aspects of the present disclosure. The operations of the method 1700 may be implemented by a network entity or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a network entity or a component thereof as described herein. Figures 1 to 5 as well as Figures 10 to 13 In some examples, the network entity may execute an instruction set to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to perform various aspects of the described functions.

[0220] At 1705, the method may include: establishing a communication link with the UE via the first TRP and the second TRP. The operations of 1705 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1705 may be performed as described in reference Fig.12 The multi-TRP communication link manager 1225 is used to execute.

[0221] At 1710, the method may include: sending scheduling information for a reference signal set to a UE. The operations of 1710 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1710 may be performed by Fig.12 The reference signal scheduling manager 1230 is used for execution.

[0222] At 1715, the method may include: identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP. The operations of 1715 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1715 may be performed by Fig.12 The reference signal TCI state manager 1235 is used to perform the above operation.

[0223] At 1720, the method may include: communicating with the UE via the first TRP and the second TRP according to the respective TCI states identified for each reference signal in the reference signal set. The operations of 1720 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1720 may be performed by Fig.12 The reference signal communication manager 1240 is used to perform the above operation.

[0224] Fig.18 1 is a flowchart illustrating a method 1800 for TCI state selection for a reference signal in supporting multi-TRP operation according to one or more aspects of the present disclosure. The operations of the method 1800 may be implemented by a network entity or a component thereof as described herein. For example, the operations of the method 1800 may be implemented by a network entity or a component thereof as described herein. Figures 1 to 5 as well as Figures 10 to 13 In some examples, the network entity may execute an instruction set to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to perform various aspects of the described functions.

[0225] At 1805, the method may include: establishing a communication link with the UE via the first TRP and the second TRP. The operations of 1805 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1805 may be performed as described in reference Fig.12 The multi-TRP communication link manager 1225 is used to execute.

[0226] At 1810, the method may include: sending scheduling information for a reference signal set to a UE. The operations of 1810 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1810 may be performed by Fig.12 The reference signal scheduling manager 1230 is used for execution.

[0227] At 1815, the method may include: sending control signaling to the UE indicating a respective TCI state for each reference signal in the reference signal set. The operations of 1815 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1815 may be performed by Fig.12 The reference signal TCI state manager 1235 is used to perform the above operation.

[0228] At 1820, the method may include: identifying a corresponding TCI state for each reference signal in the reference signal set based on an association of each reference signal with the first TRP or the second TRP. The operations of 1820 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1820 may be performed by Fig.12The reference signal TCI state manager 1235 is used to perform the above operation.

[0229] At 1825, the method may include: communicating with the UE via the first TRP and the second TRP according to the respective TCI states identified for each reference signal in the reference signal set. The operations of 1825 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1825 may be performed by Fig.12 The reference signal communication manager 1240 is used to perform the above operation.

[0230] Fig.19 A flow chart illustrating a method 1900 for TCI state selection for a reference signal in supporting multi-TRP operation according to one or more aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by a network entity or a component thereof as described herein. For example, the operations of the method 1900 may be implemented by a network entity or a component thereof as described herein. Figures 1 to 5 as well as Figures 10 to 13 In some examples, the network entity may execute an instruction set to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to perform various aspects of the described functions.

[0231] At 1905, the method may include: establishing a communication link with the UE via the first TRP and the second TRP. The operations of 1905 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1905 may be performed as described in reference Fig.12 The multi-TRP communication link manager 1225 is used to execute.

[0232] At 1910, the method may include: sending scheduling information for a reference signal set to a UE. The operations of 1910 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1910 may be performed by Fig.12 The reference signal scheduling manager 1230 is used for execution.

[0233] At 1915, the method may include: sending a DCI message including a corresponding TRP indicator field for each reference signal in the reference signal set to the UE. The operations of 1915 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1915 may be performed by Fig.12 The DCI manager 1245 is used to execute.

[0234] At 1920, the method may include: identifying a respective TCI state for each reference signal in the reference signal set based on an association of each reference signal with a first TRP or a second TRP, wherein identifying the respective TCI state for each reference signal in the reference signal set is based on a respective TRP indicator field for each reference signal in the reference signal set. The operations of 1920 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1920 may be performed by Fig.12 The reference signal TCI state manager 1235 is used to perform the above operation.

[0235] At 1925, the method may include: communicating with the UE via the first TRP and the second TRP according to the respective TCI states identified for each reference signal in the reference signal set. The operations of 1925 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1925 may be performed by Fig.12 The reference signal communication manager 1240 is used to perform the above operation.

[0236] The following provides an overview of various aspects of the disclosure:

[0237] Aspect 1: A method for performing wireless communication at a UE, the method comprising: establishing a communication link with a network via a first TRP and a second TRP; receiving scheduling information for a reference signal set; identifying a corresponding TCI state for each reference signal in the reference signal set based on an association between each reference signal in the reference signal set and the first TRP or the second TRP; and communicating with the network based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0238] Aspect 2: According to the method of aspect 1, the method also includes: receiving control signaling indicating the corresponding TCI state for each reference signal in the reference signal set.

[0239] Aspect 3: According to the method described in Aspect 2, the method also includes: identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein the control signaling indicates one of the following for each reference signal: the first TCI state, the second TCI state, or a different TCI state.

[0240] Aspect 4: According to the method described in any one of Aspects 2 to 3, the method further includes: utilizing the control signaling to receive, for each reference signal in the reference signal set, an indication of whether the corresponding TCI state corresponds to a first corresponding transmission indicator state or to a corresponding different transmission indicator state based on the association of each reference signal with the first TRP or the second TRP.

[0241] Aspect 5: The method according to any one of aspects 2 to 4, wherein receiving the control signaling includes: receiving the control signaling via MAC-CE, wherein the control signaling replaces a previous indication of a corresponding TCI state for the reference signal set.

[0242] Aspect 6: The method according to any one of aspects 2 to 5, wherein receiving the control signaling includes: receiving the control signaling via an RRC message.

[0243] Aspect 7: According to the method described in any one of Aspects 1 to 6, the method further includes: receiving a DCI message including a corresponding TRP indicator field for each reference signal in the reference signal set, wherein identifying the corresponding TCI state for each reference signal in the reference signal set is at least partially based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0244] Aspect 8: According to the method described in any one of Aspects 1 to 7, the method further includes: identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein identifying the corresponding TCI state for each reference signal in the reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set.

[0245] Aspect 9: A method according to Aspect 8, wherein identifying the TCI state for each reference signal in the reference signal set includes: identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set based at least in part on the order of the reference signal set.

[0246] Aspect 10: A method according to any one of Aspects 1 to 9, wherein the reference signal set includes an SRS set, and wherein communicating with the network according to the corresponding TCI state identified for each reference signal in the reference signal set includes: sending the SRS set according to the corresponding TCI state identified for each SRS in the SRS set.

[0247] Aspect 11: A method according to any one of Aspects 1 to 10, wherein the reference signal set includes a CSI-RS set, and wherein communicating with the network according to the corresponding TCI state identified for each reference signal in the reference signal set includes: receiving the CSI-RS set according to the corresponding TCI state identified for each CSI-RS in the CSI-RS set.

[0248] Aspect 12: A method for performing wireless communications at a network entity, the method comprising: establishing a communication link with a UE via a first TRP and a second TRP; sending scheduling information for a reference signal set to the UE; identifying a corresponding TCI state for each reference signal in the reference signal set based on an association between each reference signal in the reference signal set and the first TRP or the second TRP; and communicating with the UE via the first TRP and the second TRP based on the corresponding TCI state identified for each reference signal in the reference signal set.

[0249] Aspect 13: According to the method according to aspect 12, the method also includes: sending control signaling to the UE indicating the corresponding TCI state for each reference signal in the reference signal set.

[0250] Aspect 14: According to the method according to Aspect 13, the method also includes: identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein the control signaling indicates one of the following for each reference signal: the first TCI state, the second TCI state, or a different TCI state.

[0251] Aspect 15: According to the method described in any one of Aspects 13 to 14, the method further includes: using the control signaling to send, for each reference signal in the reference signal set, an indication of whether the corresponding TCI state corresponds to a first corresponding transmission indicator state or to a corresponding different transmission indicator state based on the association of each reference signal with the first TRP or the second TRP.

[0252] Aspect 16: The method according to any one of aspects 13 to 15, wherein sending the control signaling includes: sending the control signaling via MAC-CE, wherein the control signaling replaces a previous indication of a corresponding TCI state for the reference signal set.

[0253] Aspect 17: According to the method according to any one of Aspects 13 to 16, the method further includes: sending the control signaling via an RRC message.

[0254] Aspect 18: According to the method described in any one of Aspects 12 to 17, the method further includes: sending a DCI message to the UE including a corresponding TRP indicator field for each reference signal in the reference signal set, wherein identifying the corresponding TCI state for each reference signal in the reference signal set is at least partially based on the corresponding TRP indicator field for each reference signal in the reference signal set.

[0255] Aspect 19: According to the method described in any one of Aspects 12 to 18, the method further includes: identifying a first TCI state associated with the first TRP and a second TCI state associated with the second TRP, wherein identifying the corresponding TCI state for each reference signal in the reference signal set includes identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set.

[0256] Aspect 20: A method according to Aspect 19, wherein identifying the TCI state for each reference signal in the reference signal set includes: identifying one of the first TCI state or the second TCI state for each reference signal in the reference signal set based at least in part on the order of the reference signal set.

[0257] Aspect 21: A method according to any one of Aspects 12 to 20, wherein the reference signal set includes an SRS set, and wherein communicating with the UE according to the corresponding TCI state identified for each reference signal in the reference signal set includes: receiving the SRS set according to the corresponding TCI state identified for each SRS in the SRS set.

[0258] Aspect 22: A method according to any one of Aspects 12 to 21, wherein the reference signal set includes a CSI-RS set, and wherein communicating with the UE according to the corresponding TCI state identified for each reference signal in the reference signal set includes: sending the CSI-RS set according to the corresponding TCI state identified for each CSI-RS in the CSI-RS set.

[0259] Aspect 23: An apparatus for performing wireless communications at a UE, 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 a method according to any one of Aspects 1 to 11.

[0260] Aspect 24: An apparatus for wireless communication at a UE, the apparatus comprising: at least one component for performing the method according to any one of aspects 1 to 11.

[0261] Aspect 25: A non-transitory computer-readable medium storing a code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 11.

[0262] Aspect 26: An apparatus for wireless communication at a network entity, 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 a method according to any one of Aspects 12 to 22.

[0263] Aspect 27: An apparatus for wireless communication at a network entity, the apparatus comprising: at least one component for performing the method according to any one of aspects 12 to 22.

[0264] Aspect 28: A non-transitory computer-readable medium storing code for wireless communication at a network entity, the code comprising instructions executable by a processor to perform the method according to any one of aspects 12 to 22.

[0265] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0266] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0267] The information and signals described herein may be represented using any of a variety of different technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0268] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0269] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium, or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these items. Features that implement the functions may also be physically located at different locations, including being distributed so that the functions are implemented at different physical locations.

[0270] Computer-readable medium includes both non-transient computer storage medium and communication medium, and the communication medium includes any medium that promotes the transfer of computer program from one position to another position.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.By way of example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage device, disk storage device or other magnetic storage device, or can be used for carrying or storing desired program code parts in the form of instruction or data structure and can be accessed by general or special-purpose computer or general or special-purpose processor Any other non-transient medium.In addition, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. Disk and disc as used herein include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc. Disks can reproduce data magnetically and discs can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0271] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by phrases such as "at least one of" or "one or more of") indicates an inclusive list, such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0272] The term "determining" encompasses a variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, etc. Additionally, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Additionally, "determining" may include parsing, retrieving, selecting, choosing, establishing, and other such similar actions.

[0273] In the drawings, similar components or features may have the same reference numeral. In addition, various components of the same type may be distinguished by following the reference numeral with a dash and a second reference numeral to distinguish between similar components. If only the first reference numeral is used in the specification, the description may apply to any of the similar components having the same first reference numeral regardless of the second reference numeral, or other subsequent reference numerals.

[0274] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "having advantages over other examples." The specific embodiments include specific details for providing an understanding of the described technology. However, these technologies may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0275] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: establishing a communication link with a network via a first sending and receiving point and a second sending and receiving point; receiving scheduling information for a reference signal set; identifying a corresponding transmission configuration indicator state for each reference signal according to an association of each reference signal in the reference signal set with the first transmission and reception point or the second transmission and reception point; as well as Communicating with the network is performed based on the respective transmit configuration indicator state identified for each reference signal in the set of reference signals.

2. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: Control signaling is received indicating the respective transmit configuration indicator state for each reference signal in the set of reference signals.

3. The apparatus of claim 2, wherein the instructions are further executable by the processor to cause the apparatus to: Identify a first transmit configuration indicator state associated with the first transmit and receive point and a second transmit configuration indicator state associated with the second transmit and receive point, wherein the control signaling indicates one of the following for each reference signal: the first transmit configuration indicator state, the second transmit configuration indicator state, or a different transmit configuration indicator state.

4. The apparatus of claim 2, wherein the instructions are further executable by the processor to cause the apparatus to: Receiving, using the control signaling, for each reference signal in the reference signal set, an indication of whether the corresponding transmission configuration indicator state corresponds to a first corresponding transmission indicator state or to a corresponding different transmission indicator state based on the association of each reference signal with the first transmission and reception point or the second transmission and reception point.

5. The apparatus of claim 2, wherein the instructions for receiving the control signaling are executable by the processor to cause the apparatus to: The control signaling is received via a medium access control (MAC) control element, wherein the control signaling replaces a previous indication of a corresponding transmit configuration indicator state for the reference signal set.

6. The apparatus of claim 2, wherein the instructions for receiving the control signaling are executable by the processor to cause the apparatus to: The control signaling is received via a radio resource control message.

7. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: Receive a downlink control information message including corresponding transmit and receive point indicator fields for each reference signal in the reference signal set, wherein identifying the corresponding transmit configuration indicator state for each reference signal in the reference signal set is at least partially based on the corresponding transmit and receive point indicator fields for each reference signal in the reference signal set.

8. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: Identifying a first transmission configuration indicator state associated with the first transmission and reception point and a second transmission configuration indicator state associated with the second transmission and reception point, wherein identifying the corresponding transmission configuration indicator state for each reference signal in the reference signal set comprises: One of the first transmit configuration indicator state or the second transmit configuration indicator state is identified for each reference signal in the set of reference signals.

9. The apparatus of claim 8, wherein the instructions for identifying the transmit configuration indicator state for each reference signal in the reference signal set are executable by the processor to cause the apparatus to: One of the first transmit configuration indicator state or the second transmit configuration indicator state is identified for each reference signal in the set of reference signals based at least in part on an order of the set of reference signals.

10. The apparatus of claim 1, wherein the set of reference signals comprises a sounding reference signal set, wherein the instructions for communicating with the network according to the respective transmit configuration indicator state identified for each reference signal in the set of reference signals are executable by the processor to cause the apparatus to: The sounding reference signal set is transmitted according to the corresponding transmission configuration indicator state identified for each sounding reference signal in the sounding reference signal set.

11. The apparatus of claim 1 , wherein the reference signal set comprises a channel state information reference signal set, wherein the instructions for communicating with the network according to the corresponding transmit configuration indicator state identified for each reference signal in the reference signal set are executable by the processor to cause the apparatus to: The set of channel state information reference signals is received according to the corresponding transmission configuration indicator state identified for each channel state information reference signal in the set of channel state information reference signals.

12. An apparatus for wireless communication at a network entity, the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: establishing a communication link with a user equipment (UE) via a first transmission and reception point and a second transmission and reception point; Sending scheduling information for a reference signal set to the UE; identifying a corresponding transmission configuration indicator state for each reference signal according to an association of each reference signal in the reference signal set with the first transmission and reception point or the second transmission and reception point; as well as Communicating with the UE via the first transmission and reception point and the second transmission and reception point according to the respective transmission configuration indicator state identified for each reference signal in the set of reference signals.

13. The apparatus of claim 12, wherein the instructions are further executable by the processor to cause the apparatus to: Control signaling is sent to the UE indicating the corresponding transmission configuration indicator state for each reference signal in the reference signal set.

14. The apparatus of claim 13, wherein the instructions are further executable by the processor to cause the apparatus to: Identify a first transmit configuration indicator state associated with the first transmit and receive point and a second transmit configuration indicator state associated with the second transmit and receive point, wherein the control signaling indicates one of the following for each reference signal: the first transmit configuration indicator state, the second transmit configuration indicator state, or a different transmit configuration indicator state.

15. The apparatus of claim 13, wherein the instructions are further executable by the processor to cause the apparatus to: For each reference signal in the reference signal set, the control signaling is used to send an indication of whether the corresponding transmission configuration indicator state corresponds to a first corresponding transmission indicator state or to a corresponding different transmission indicator state based on the association of each reference signal with the first transmission and reception point or the second transmission and reception point.

16. The apparatus of claim 13, wherein the instructions for sending the control signaling are executable by the processor to cause the apparatus to: The control signaling is sent via a medium access control (MAC) control element, wherein the control signaling replaces a previous indication of a corresponding transmit configuration indicator state for the reference signal set.

17. The apparatus of claim 13, wherein the instructions are further executable by the processor to cause the apparatus to: The control signaling is sent via a radio resource control message.

18. The apparatus of claim 12, wherein the instructions are further executable by the processor to cause the apparatus to: and sending a downlink control information message to the UE including respective transmit and receive point indicator fields for each reference signal in the reference signal set, wherein identifying the respective transmit configuration indicator state for each reference signal in the reference signal set is based at least in part on the respective transmit and receive point indicator fields for each reference signal in the reference signal set.

19. The apparatus of claim 12, wherein the instructions are further executable by the processor to cause the apparatus to: Identifying a first transmission configuration indicator state associated with the first transmission and reception point and a second transmission configuration indicator state associated with the second transmission and reception point, wherein identifying the corresponding transmission configuration indicator state for each reference signal in the reference signal set comprises: One of the first transmit configuration indicator state or the second transmit configuration indicator state is identified for each reference signal in the set of reference signals.

20. The apparatus of claim 19, wherein the instructions for identifying the transmit configuration indicator state for each reference signal in the set of reference signals are executable by the processor to cause the apparatus to: One of the first transmit configuration indicator state or the second transmit configuration indicator state is identified for each reference signal in the set of reference signals based at least in part on an order of the set of reference signals.

21. The apparatus of claim 12, wherein the reference signal set comprises a sounding reference signal set, wherein the instructions for communicating with the UE according to the respective transmit configuration indicator state identified for each reference signal in the reference signal set are executable by the processor to cause the apparatus to: The set of sounding reference signals is received according to the corresponding transmit configuration indicator state identified for each sounding reference signal in the set of sounding reference signals.

22. The apparatus of claim 12, wherein the set of reference signals comprises a set of channel state information reference signals, wherein the instructions for communicating with the UE based on the corresponding transmit configuration indicator state identified for each reference signal in the set of reference signals are executable by the processor to cause the apparatus to: The channel state information reference signal set is transmitted according to the corresponding transmission configuration indicator state identified for each channel state information reference signal in the channel state information reference signal set.

23. A method for wireless communication at a user equipment (UE), the method comprising: establishing a communication link with a network via a first sending and receiving point and a second sending and receiving point; receiving scheduling information for a reference signal set; identifying a corresponding transmission configuration indicator state for each reference signal according to an association of each reference signal in the reference signal set with the first transmission and reception point or the second transmission and reception point; as well as Communicating with the network is performed based on the respective transmit configuration indicator state identified for each reference signal in the set of reference signals.

24. The method according to claim 23, further comprising: Control signaling is received indicating the respective transmit configuration indicator state for each reference signal in the set of reference signals.

25. The method according to claim 24, further comprising: Identify a first transmit configuration indicator state associated with the first transmit and receive point and a second transmit configuration indicator state associated with the second transmit and receive point, wherein the control signaling indicates one of the following for each reference signal: the first transmit configuration indicator state, the second transmit configuration indicator state, or a different transmit configuration indicator state.

26. The method according to claim 24, further comprising: Receiving, using the control signaling, for each reference signal in the reference signal set, an indication of whether the corresponding transmission configuration indicator state corresponds to a first corresponding transmission indicator state or to a corresponding different transmission indicator state based on the association of each reference signal with the first transmission and reception point or the second transmission and reception point.

27. The method of claim 24, wherein receiving the control signaling comprises: The control signaling is received via a medium access control (MAC) control element, wherein the control signaling replaces a previous indication of a corresponding transmit configuration indicator state for the reference signal set.

28. The method of claim 24, wherein receiving the control signaling comprises: The control signaling is received via a radio resource control message.

29. The method of claim 23, further comprising: Receive a downlink control information message including corresponding transmit and receive point indicator fields for each reference signal in the reference signal set, wherein identifying the corresponding transmit configuration indicator state for each reference signal in the reference signal set is at least partially based on the corresponding transmit and receive point indicator fields for each reference signal in the reference signal set.

30. A method for wireless communication at a network entity, the method comprising: establishing a communication link with a user equipment (UE) via a first transmission and reception point and a second transmission and reception point; Sending scheduling information for a reference signal set to the UE; identifying a corresponding transmission configuration indicator state for each reference signal according to an association of each reference signal in the reference signal set with the first transmission and reception point or the second transmission and reception point; as well as Communicating with the UE via the first transmission and reception point and the second transmission and reception point according to the respective transmission configuration indicator state identified for each reference signal in the set of reference signals.

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