Method for configuring, activating, and indicating transmission configuration indicator (TCI) states associated with beam prediction
Patent Information
- Application Number
- PCT/CN2024/074272
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-07-31
Smart Images

Figure CN2024074272_31072025_PF_FP_ABST
Abstract
Description
METHOD FOR CONFIGURING, ACTIVATING, AND INDICATING TRANSMISSION CONFIGURATION INDICATOR (TCI) STATES ASSOCIATED WITH BEAM PREDICTIONFIELD
[0001] This disclosure relates generally to wireless communications and, more particularly, to configuring, activating, and indicating transmission configuration indicator (TCI) states.BACKGROUND
[0002] This background description is provided for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent as described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, is neither expressly nor impliedly admitted as prior art against the present disclosure.
[0003] A user equipment (UE) and a network entity may use analog beamforming to increase link budget. To use analog beamforming, the network entity and UE may maintain multiple beams or beam pairs. A good network-UE beam pair may greatly increase the link budget, thus providing significant coverage gain. The beam selection procedure has been defined as typically performed in two steps: 1) beam measurement and report; 2) beam indication. The network entity may indicate the beam by indicating one of the transmission configuration indicator (TCI) states in a TCI state list configured by radio resource control (RRC) signaling sent from the network entity to the UE. The network may configure different quasi-co-location (QCL) source for different TCI states.
[0004] For the unified TCI based beam indication, the network entity may indicate a joint TCI to update the beam for both uplink and downlink channels or indicate a downlink TCI to update the beam for downlink channels and / or an uplink TCI to update the beam for uplink channels. The network entity may configure a TCI list for a bandwidth part by RRC signaling and activate a subset of TCI states by medium access control (MAC) control element (CE) . The activated TCI states corresponding to different TCI-codepoint in downlink control information (DCI) . Then if the activated TCI states corresponding to more than one TCI-codepoints, the network entity may transmit a DCI to select the TCI state (s) corresponding to one TCI-codepoint for further communication.
[0005] Currently, the configuration, activation, and indication of TCI states do not accommodate predicting a beam (pair) that has not been applied to downlink reference signals (DL RSs) . The control signaling for the TCI states may also differ when the TCI activation or indication is associated with or without beam prediction, causing potential configuration issues.SUMMARY
[0006] The present disclosure provides methods, systems, and techniques for configuring, activating, and indicating transmission configuration indicator (TCI) states associated with different beam prediction situations, such as with or without beam prediction configurations. Beamforming enables a network entity and a user equipment (UE) to focus wireless signals in specific directions to increase link budget. For example, the UE performs beam measurements and reports the results to the network, which then indicates particular beam directions (e.g., TCI states) to the UE for subsequent communications. In some cases, the network entity indicates a joint TCI state to update the beam for both uplink and downlink channels, or indicate respective downlink and uplink TCI states for respective downlink and / or uplink channels.
[0007] According to general aspects of this disclosure, a method for wireless communications by a user equipment (UE) includes receiving, from a network entity, a first control signaling indicating: at least one beam-prediction TCI state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay. The UE receives a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state. The UE then communicates with the network entity based on the one or more TCI states at an action time associated with the first delay or the second delay.
[0008] In aspects, the first control signaling indicates a parameter for enabling activation or indication of the at least one beam-prediction TCI state.
[0009] In aspects, the at least one beam-prediction TCI state includes a first list of TCI states for TCI activation or indication with beam prediction corresponding to the first delay for a beam prediction window. The at least one non-beam-prediction TCI state includes a second list of TCI states for TCI activation or indication without beam prediction for the second delay.
[0010] In aspects, the at least one beam-prediction TCI state is same as the at least one non-beam-prediction TCI state.
[0011] In aspects, the second control signaling includes a medium access control (MAC) control element (CE) . In some cases, the MAC CE indicates whether each or all of the one or more activated TCI states are used for beam prediction, and whether the one or more activated TCI states corresponding to a transmission reception point (TRP) is for beam prediction. The UE may identify whether the MAC CE is for beam prediction based on a logical channel identifier (LCID) or an extended LCID for the MAC CE.
[0012] In aspects, the UE receives, from the network entity, the one or more activated TCI states for one or more beam predictions in the MAC CE.
[0013] In aspects, the UE receives a downlink control information (DCI) indicating one or more TCI states of the TCI states that have been activated by the second control signaling (referred to as “a set of TCI states” ) . In some cases, the DCI indicates whether the one or more TCI states are used for beam prediction via at least one of: a location of physical downlink control channel (PDCCH) with the DCI; or a format of the DCI.
[0014] In some cases, the UE receives, from the network entity, a number of indicated TCI states for one or more beam prediction windows. The UE identifies the action time for applying the set of TCI states based on at least one of: a predefined slot; a predefined time after a first last symbol of the PDCCH with the DCI; or a slot configured by the network entity.
[0015] In aspects, the first control signaling further indicates, for each beam-prediction TCI state, at least one of: a first downlink reference signal (DL RS) associated with quasi-co-location type D (QCL-typeD) for spatial reception parameter indication; a second DL RS associated with a pathloss reference signal (PL-RS) ; or a third DL RS associated with QCL-type A for average delay, delay spread, Doppler shift and Doppler spread indication.
[0016] In some cases, the UE monitors for the first DL RS, the second DL RS, and the third DL RS after receiving the second control signaling or after transmitting an acknowledgement (ACK) for the second control signaling. The UE refrains from monitoring for the first DL RS, the second DL RS, or the third DL RS after switching to another activated TCI state.
[0017] In some cases, the UE receives, for the one or more TCI states, at least one of: a first set of aperiodic DL RS resources quasi-co-located (QCLed) with the first DL RS associated with the QCL-typeD indication; a second set of aperiodic DL RS resources QCLed with the second DL RS associated with the PL-RS; or a third set of DL RS resources QCLed with the third DL RS associated with the QCL-typeA indication.
[0018] In aspects, the UE determines the first delay and the second delay based on at least one of: a delay from receiving the second control signaling to transmitting the acknowledgement (ACK) for the second control signaling; a delay for quasi-co-location (QCL) parameter tracking; a delay for UE beam tracking based on whether an associated TCI state is known or unknown; a delay for pathloss measurement based on whether the UE maintains a pathloss operation; or the beam prediction window.
[0019] According to general aspects of this disclosure, a method for wireless communications by a network entity, the method includes transmitting, to a UE, a first control signaling indicating at least one beam-prediction transmission configuration indicator (TCI) state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay. The network entity transmits a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state. The network entity communicates with the UE based on the one or more TCI states at an action time associated with the first delay or the second delay.
[0020] In aspects, the at least one beam-prediction TCI state includes a first list of TCI states for TCI activation or indication with beam prediction corresponding to the first delay for a beam prediction window. The at least one non-beam-prediction TCI state includes a second list of TCI states for TCI activation or indication without beam prediction for the second delay. In some cases, the network entity transmits, to the UE for each beam-prediction TCI state, at least one of: a first downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type D for spatial reception parameter indication in the beam-prediction TCI state; a second DL RS associated with or configured as pathloss reference signal (PL-RS) for the beam-prediction TCI state; or a third DL RS associated with or configured as DL RS for QCL type A for average delay, delay spread, Doppler shift and Doppler spread indication in the beam-prediction TCI state.
[0021] According to general aspects of this disclosure, an apparatus includes one or more radio frequency (RF) modems; a processor coupled to the one or more RF modems; and at least one memory storing executable instructions. The executable instructions manipulate at least one of the processors or the one or more RF modems to perform the above methods, which are discussed in details herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Fig. 1 illustrates a diagram of a wireless communications system that includes multiple user equipments (UEs) and network entities in communication over one or more cells, according to aspects of this disclosure.
[0023] Fig. 2a illustrates an example diagram of transmission configuration indicator (TCI) indication for a single transmission reception point (sTRP) operation, in accordance with aspects of this disclosure.
[0024] Fig. 2b illustrates an example diagram of TCI indication for a multiple transmission reception point (mTRP) operation, in accordance with aspects of this disclosure.
[0025] Fig. 3 illustrates an example diagram of robust TCI activation / indication based on beam prediction, in accordance with aspects of this disclosure.
[0026] Fig. 4 illustrates an example diagram of UE behavior in robust TCI activation / indication based on beam prediction, in accordance with aspects of this disclosure.
[0027] Fig. 5 illustrates an example diagram of network entity behavior in robust TCI activation / indication based on beam prediction, in accordance with aspects of this disclosure.
[0028] Fig. 6a illustrates an example for separate TCI configurations for TCI activation / indication with / without beam prediction, in accordance with aspects of this disclosure.
[0029] Fig. 6b illustrates an example for a common TCI configuration for TCI activation / indication with / without beam prediction, in accordance with aspects of this disclosure.
[0030] Fig. 7a illustrates an example for a MAC CE based TCI activation / indication with / without beam prediction, in accordance with aspects of this disclosure.
[0031] Fig. 7b illustrates an example for the MAC CE based TCI activation / indication for multiple prediction windows with beam prediction, in accordance with aspects of this disclosure.
[0032] Fig. 8a illustrates an example for a common DCI format based TCI indication with / without beam prediction, in accordance with aspects of this disclosure.
[0033] Fig. 8b illustrates an example for TCI indication with beam prediction for multiple beam prediction windows, in accordance with aspects of this disclosure.
[0034] Fig. 8c illustrates an example for TCI indication based on the activated TCI states at the action time for the TCI indication, in accordance with aspects of this disclosure.
[0035] Fig. 9a illustrates an example for the TCI activation / indication based on periodic downlink (DL) reference signal (RS) , in accordance with aspects of this disclosure.
[0036] Fig. 9b illustrates an example for the semi-persistent DL RS based QCL / pathloss measurement for activated / indicated TCI state (s) , in accordance with aspects of this disclosure.
[0037] Fig. 9c illustrates an example for QCL / pathloss measurement based on the periodic, semi-persistent, and / or aperiodic DL RS, in accordance with aspects of this disclosure.
[0038] Fig. 10a illustrates an example for the QCL / pathloss measurement for the TCI activation / indication with beam prediction before the beam prediction window, in accordance with aspects of this disclosure.
[0039] Fig. 10b illustrates an example for the QCL / pathloss measurement for the TCI activation / indication with beam prediction after the beam prediction window, in accordance with aspects of this disclosure.
[0040] Fig. 10c illustrates an example for the QCL / pathloss measurement for the TCI activation / indication with beam prediction after 3 slots after transmitting ACK for the TCI activation / indication signaling, in accordance with aspects of this disclosure.
[0041] Fig. 10d illustrates an example for when TCI action time for a first prediction window is after a second beam prediction window, in accordance with aspects of this disclosure.
[0042] Fig. 11 illustrates an example flowchart of a method performed by a UE, in accordance with aspects of this disclosure.
[0043] Fig. 12 illustrates an example flowchart of a method performed by a network entity, in accordance with aspects of this disclosure.
[0044] Fig. 13 is a diagram illustrating a hardware implementation for an example UE apparatus.
[0045] Fig. 14 is a diagram illustrating a hardware implementation for one or more example network entities.
[0046] Like numerals indicate like elements.DETAILED DESCRIPTION
[0047] The present disclosure provides methods, systems, and techniques for configuring, activating, and indicating transmission configuration indicator (TCI) states associated with different beam prediction situations, such as with or without beam prediction configurations. Beamforming enables a network entity and a user equipment (UE) to focus wireless signals in specific directions to increase link budget. For example, the UE performs beam measurements and reports the results to the network, which then indicates particular beam directions (e.g., TCI states) to the UE for subsequent communications. In some cases, the network entity indicates a joint TCI state to update the beam for both uplink and downlink channels, or indicate respective downlink and uplink TCI states for respective downlink and / or uplink channels.
[0048] Upon receiving a beam report from the UE, the network entity may predict a beam that may not have been applied to any downlink reference signals (DL RS) used for the beam report (e.g., spatial beam prediction) . Accordingly, the present disclosure provides methods for performing or ascertaining time offset, frequency offset, beam tracking, or pathloss measurement for activated or indicated (activated / indicated) TCI states based on the predicted beam. In addition, when the beam prediction is based on historical beam reports (e.g., temporal beam prediction) , the present disclosure provides methods for determining an action time and action delay, so that the network and the UE stop communication based on the previously activated / indicated TCI and start measuring time offset, frequency offset, etc. for communication based on newly activated / indicated TCI states. Furthermore, because the network and UE may or may not use beam prediction in different scenarios, techniques herein enable the network entity and the UE to configure, activate, and indicate TCI states with or without beam prediction (e.g., related to different action delays and other operational parameters) , in a flexible and robust manner.
[0049] In beamforming, a network entity may perform spatial or time (e.g., temporal) domain beam prediction. For example, in spatial domain beam prediction, the network entity may predict a network beam (e.g., in a desired direction) based on the received beam report for a subset of beams. The network entity may predict a beam that has or has not been applied to any DL RS, e.g., SSB / CSI-RS. The network entity may provide the TCI activation / indication based on the predicted beam. The present disclosure provides method and techniques for determining, when the network entity has not transmitted or configured any DL RS based on the predicted beam, the time offset, frequency offset, UE beam tracking and / or pathloss measurement for the activated / indicated TCI based on the predicted beam.
[0050] In temporal beam prediction, the network entity may predict the network beam to be used in the future based on the historical beam report (s) received. The network entity may predict at least one beam in a beam prediction window, e.g., X ms after the TCI activation / indication for beam prediction, or X ms after receiving TCI activation / indication command from the network, or X ms after receiving ACK for the TCI activation / indication command within PDSCH. The network entity may predict a beam that has or has not been applied to any DL RS. With regard to time offset, frequency offset and UE beam tracking for the predict beam, how to determine the action time and action delay for the activated / indicated TCI for beam prediction, e.g., when to stop communication based on the previously activated / indicated TCI, when to start to measure time offset, frequency offset, UE beam tracking and / or pathloss and when to start communication based on the newly activated / indicated TCI may be one problem.
[0051] To achieve robust operations, the network entity may transmit the TCI activation / indication with or without beam prediction. Depending on whether beam prediction is involved, the UE may apply different action delays for the TCI activation / indication signaling. The present disclosure provides for identifying whether the TCI activation / indication is for beam prediction. Moreover, this disclosure further provides for determining which channel (s) / RS (s) should be the target channel (s) / RS (s) to apply the activated / indicated TCI with beam prediction. As such, this disclosure presents example methods and techniques for providing control signaling to differentiate TCI activation / indication with or without beam prediction, providing new parameters for DL RS configuration and transmission, such as for time offset, frequency offset, UE beam tracking and / or pathloss measurement for the activated / indicated TCI state based on beam prediction, and determining action delay and action time for the TCI state based on beam prediction.
[0052] At a high level, aspects of this disclosure for configuring, activating, and indicating TCI states include a wireless communication method by a UE. The example method includes receiving, from a network entity, a first control signaling indicating: at least one beam-prediction TCI state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay. The UE receives a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state. The UE then communicates with the network entity based on the one or more TCI states at an action time associated with the first delay or the second delay.
[0053] Complimentary aspects of the disclosure include an example method of configuring CSI reporting by a network entity. The example method includes transmitting, to a UE, a first control signaling indicating at least one beam-prediction transmission configuration indication (TCI) state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay. The network entity transmits a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state. The network entity communicates with the UE based on the one or more TCI states at an action time associated with the first delay or the second delay.
[0054] Fig. 1 illustrates a diagram 100 of a wireless communications system associated with multiple cells 190. The wireless communications system includes user equipments (UEs) 102 and base stations / network entities 104. Some base stations may include an aggregated base station architecture and other base stations may include a disaggregated base station architecture. The aggregated base station architecture utilizes a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node. A disaggregated base station architecture utilizes a protocol stack that is physically or logically distributed among two or more units (e.g., radio unit (RU) 106, distributed unit (DU) 108, central unit (CU) 110) . For example, a CU 110 is implemented within a RAN node, and one or more DUs 108 may be co-located with the CU 110, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes. The DUs 108 may be implemented to communicate with one or more RUs 106. Any of the RU 106, the DU 108 and the CU 110 may be implemented as virtual units, such as a virtual radio unit (VRU) , a virtual distributed unit (VDU) , or a virtual central unit (VCU) . The base station / network entity 104 (e.g., an aggregated base station or disaggregated units of the base station, such as the RU 106 or the DU 108) , may be referred to as a transmission reception point (TRP) .
[0055] Operations of the base station (BS) 104 and / or network designs may be based on aggregation characteristics of base station functionality. For example, disaggregated base station architectures are utilized in an integrated access backhaul (IAB) network, an open-radio access network (O-RAN) network, or a virtualized radio access network (vRAN) , which may also be referred to a cloud radio access network (C-RAN) . Disaggregation may include distributing functionality across the two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which may enable flexibility in network designs. The various units of the disaggregated base station architecture, or the disaggregated RAN architecture, may be configured for wired or wireless communication with at least one other unit. For example, the base stations (BSs) 104d, 104e and / or the RUs 106a, 106b, 106c, 106d may communicate with the UEs 102a, 102b, 102c, 102d, and / or 102s via one or more radio frequency (RF) access links based on a Uu interface. In examples, multiple RUs 106 and / or BSs 104 may simultaneously serve the UEs 102, such as by intra-cell and / or inter-cell access links between the UEs 102 and the RUs 106 / BSs 104.
[0056] The RU 106, the DU 108, and the CU 110 may include (or may be coupled to) one or more interfaces configured to transmit or receive information / signals via a wired or wireless transmission medium. For example, a wired interface may be configured to transmit or receive the information / signals over a wired transmission medium, such as via the fronthaul link 160 between the RU 106d and the baseband unit (BBU) 112 of the BS 104d associated with the cell 190d. The BBU 112 includes a DU 108 and a CU 110, which may also have a wired interface (e.g., midhaul link) configured between the DU 108 and the CU 110 to transmit or receive the information / signals between the DU 108 and the CU 110. In further examples, a wireless interface, which may include a receiver, a transmitter, or a transceiver, such as an RF transceiver, configured to transmit and / or receive the information / signals via the wireless transmission medium, such as for information communicated between the RU 106a of the cell 190a and the BS 104e of the cell 190e via cross-cell communication beams 136-138 of the RU 106a and the BS 104e.
[0057] The RUs 106 may be configured to implement lower layer functionality. For example, the RU 106 is controlled by the DU 108 and may correspond to a logical node that hosts RF processing functions, or lower layer PHY functionality, such as execution of fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, etc. The functionality of the RU 106 may be based on the functional split, such as a functional split of lower layers.
[0058] The RUs 106 may transmit or receive over-the-air (OTA) communication with one or more UEs 102. For example, the RU 106b of the cell 190b communicates with the UE 102b of the cell 190b via a first set of communication beams 132 of the RU 106b and a second set of communication beams 134b of the UE 102b, which may correspond to inter-cell communication beams or, in some examples, cross-cell communication beams. For instance, the UE 102b of the cell 190b may communicate with the RU 106a of the cell 190a via a third set of communication beams 134a of the UE 102b and a fourth set of communication beams 136 of the RU 106a. DUs 108 may control both real-time and non-real-time features of control plane and user plane communications of the RUs 106.
[0059] Any combination of the RU 106, the DU 108, and the CU 110, or reference thereto individually, may correspond to a BS 104. Thus, the BS 104 may include at least one of the RU 106, the DU 108, or the CU 110. The BSs 104 provide the UEs 102 with access to a core network. The BSs 104 may relay communications between the UEs 102 and the core network (not shown) . The BSs 104 may be associated with macrocells for higher-power cellular base stations and / or small cells for lower-power cellular base stations. For example, the cell 190e may correspond to a macrocell, whereas the cells 190a-190d may correspond to small cells. Small cells include femtocells, picocells, microcells, etc. A network that includes at least one macrocell and at least one small cell may be referred to as a “heterogeneous network. ”
[0060] Transmissions from a UE 102 to a BS 104 / RU 106 are referred to as uplink (UL) transmissions, whereas transmissions from the BS 104 / RU 106 to the UE 102 are referred to as downlink (DL) transmissions. Uplink transmissions may also be referred to as reverse link transmissions and downlink transmissions may also be referred to as forward link transmissions. For example, the RU 106d utilizes antennas of the BS 104d of cell 190d to transmit a downlink / forward link communication to the UE 102d or receive an uplink / reverse link communication from the UE 102d based on the Uu interface associated with the access link between the UE 102d and the BS 104d / RU 106d.
[0061] Communication links between the UEs 102 and the BSs 104 / RUs 106 may be based on multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication links may be associated with one or more carriers. The UEs 102 and the BSs 104 / RUs 106 may utilize a spectrum bandwidth of Y MHz (e.g., 5, 10, 15, 20, 100, 400, 800, 1600, 2000, etc. MHz) per carrier allocated in a carrier aggregation of up to a total of Yx MHz, where x component carriers (CCs) are used for communication in each of the uplink and downlink directions. The carriers may or may not be adjacent to each other along a frequency spectrum. In examples, uplink and downlink carriers may be allocated in an asymmetric manner, with more or fewer carriers allocated to either the uplink or the downlink. A primary component carrier and one or more secondary component carriers may be included in the component carriers. The primary component carrier may be associated with a primary cell (Pcell) and a secondary component carrier may be associated with a secondary cell (Scell) .
[0062] Some UEs 102, such as the UEs 102a and 102s, may perform device-to-device (D2D) communications over sidelink. For example, a sidelink communication / D2D link utilizes a spectrum for a wireless wide area network (WWAN) associated with uplink and downlink communications. Such sidelink / D2D communication may be performed through various wireless communications systems, such as wireless fidelity (Wi-Fi) systems, Bluetooth systems, Long Term Evolution (LTE) systems, New Radio (NR) systems, etc.
[0063] The UEs 102 and the BSs 104 / RUs 106 may each include multiple antennas. The multiple antennas may correspond to antenna elements, antenna panels, and / or antenna arrays that may facilitate beamforming operations. For example, the RU 106b transmits a downlink beamformed signal based on a first set of communication beams 132 to the UE 102b in one or more transmit directions of the RU 106b. The UE 102b may receive the downlink beamformed signal based on a second set of communication beams 134b from the RU 106b in one or more receive directions of the UE 102b. In a further example, the UE 102b may also transmit an uplink beamformed signal (e.g., sounding reference signal (SRS) ) to the RU 106b based on the second set of communication beams 134b in one or more transmit directions of the UE 102b. The RU 106b may receive the uplink beamformed signal from the UE 102b in one or more receive directions of the RU 106b. The UE 102b may perform beam training to determine the best receive and transmit directions for the beamformed signals. The transmit and receive directions for the UEs 102 and the BSs 104 / RUs 106 may or may not be the same.
[0064] In further examples, beamformed signals may be communicated between a first base station / RU 106a and a second BS 104e. For instance, the BS 104e of the cell 190e may transmit a beamformed signal to the RU 106a based on the communication beams 138 in one or more transmit directions of the BS 104e. The RU 106a may receive the beamformed signal from the BS 104e of the cell 190e based on the RU communication beams 136 in one or more receive directions of the RU 106a. In further examples, the BS 104e transmits a downlink beamformed signal to the UE 102e based on the communication beams 138 in one or more transmit directions of the BS 104e. The UE 102e receives the downlink beamformed signal from the BS 104e based on UE communication beams 130 in one or more receive directions of the UE 102e. The UE 102e may also transmit an uplink beamformed signal to the BS 104e based on the UE communication beams 130 in one or more transmit directions of the UE 102e, such that the BS 104e may receive the uplink beamformed signal from the UE 102e in one or more receive directions of the BS 104e.
[0065] The BS 104 may include and / or be referred to as a network entity. That is, “network entity” may refer to the BS 104 or at least one unit of the BS 104, such as the RU 106, the DU 108, and / or the CU 110. The BS 104 may also include and / or be referred to as a next generation evolved Node B (ng-eNB) , a next generation NB (gNB) , an evolved NB (eNB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a TRP, a network node, network equipment, or other related terminology. The BS 104 or an entity at the BS 104 may be implemented as an IAB node, a relay node, a sidelink node, an aggregated (monolithic) base station, or a disaggregated base station including one or more RUs 106, DUs 108, and / or CUs 110. A set of aggregated or disaggregated base stations may be referred to as a next generation-radio access network (NG- RAN) . In some examples, the UE 102a operates in dual connectivity (DC) with the BS 104e and the base station / RU 106a. In such cases, the BS 104e may be a master node and the base station / RU 160a may be a secondary node.
[0066] Uplink / downlink signaling may also be communicated via a satellite positioning system (SPS) 114. In an example, the SPS 114 associated with the cell 190c may be in communication with one or more UEs 102, such as the UE 102c, and one or more BSs 104 / RUs 106, such as the RU 106c. The SPS 114 may correspond to one or more of a Global Navigation Satellite System (GNSS) , a global position system (GPS) , a non-terrestrial network (NTN) , or other satellite position / location system. The SPS 114 may be associated with LTE signals, NR signals (e.g., based on round trip time (RTT) and / or multi-RTT) , wireless local area network (WLAN) signals, a terrestrial beacon system (TBS) , sensor-based information, NR enhanced cell ID (NR E-CID) techniques, downlink angle-of-departure (DL-AoD) , downlink time difference of arrival (DL-TDOA) , uplink time difference of arrival (UL-TDOA) , uplink angle-of-arrival (UL-AoA) , and / or other systems, signals, or sensors.
[0067] In Fig. 1, any of the UEs 102 may include a TCI states component 140 configured to receiving, from the BS 104, a first control signaling indicating: at least one beam-prediction TCI state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay. The TCI states component 140 receives a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state. The UE 102 then communicates with the BS 104 based on the one or more TCI states at an action time associated with the first delay or the second delay. The BS 104 includes a TCI states component 150 configured to perform complementary operations of the example methods herein with the TSI states component 140.
[0068] Accordingly, Fig. 1 describes a wireless communication system that may be implemented in connection with aspects of one or more other figures described herein. Further, although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as 5G-Advanced and future versions, LTE, LTE-advanced (LTE-A) , and other wireless technologies, such as 6G.
[0069] Fig. 2a illustrates an example diagram 200 of joint TCI indication for a single transmission reception point (sTRP) operation, in accordance with aspects of this disclosure. In Fig. 2a, the network entity indicates one TCI state only. As shown, the network may first transmit an RRC configured TCI state list 210 to the UE. The network entity then transmits a MAC CE 220 to the UE to activate a subset of TCI states of the RRC configured TCI state list 210. The network entity transmits a DCI 230 to indicate the TCI state corresponding to a selected or desired beam to be used for communicating with the UE (e.g., for downlink and uplink communications) .
[0070] Fig. 2b illustrates an example diagram 240 of TCI indication for a multiple transmission reception point (mTRP) operation, in accordance with aspects of this disclosure. As shown, the network may indicate multiple TCI states and each indicated TCI state corresponding to the signal for one TRP. The network entity transmits an RRC signal configuring a TCI state list 250 for the UE. The network entity then transmits a MAC CE 260 to the UE to activate a subset of TCI states of the RRC configured TCI state list 250. The network entity transmits a DCI 270 to indicate multiple TCI states for respective signals corresponding to each TRP. The indicated unified TCI state (s) may be applied to multiple channels. Table 1 illustrates example target channels for the indicated unified TCI state (s) . For other channels that the indicated unified TCI state (s) are not applied to, the network entity may transmit a dedicated signaling, e.g., a dedicated MAC CE, for beam indication.
[0071] Table 1: Target / applicable channels / RSs for indicated unified TCI state
[0072] The UE starts to apply the activated / indicated downlink TCI state after a first processing delay. The first processing delay may include the processing delay for the MAC CE decoding and ACK preparation, a delay for time and frequency offset tracking for the TCI, and / or the UE beam tracking delay if the downlink TCI state is unknown. The UE starts to apply the activated / indicated uplink TCI state after a second processing delay, which may include the processing delay for the MAC CE decoding and ACK preparation, delay for pathloss measurement for the TCI if the UE has not tracked or maintained the pathloss for the TCI, and UE beam tracking delay if the uplink TCI state is unknown. The UE starts to apply the activated / indicated joint TCI state after the maximum value of the first and second processing delay. Alternatively, the UE starts to apply the activated / indicated joint TCI state after the first processing delay, where the pathloss measurement may be included. The known and unknown TCI state conditions may generally be understood in view of 3GPP Technical Specification (TS) 38.133, sections 8.15.2 and 8.16.2.
[0073] In one example (e.g., see 3GPP TS 38.133, sections 8.15.3 and 8.16.3) , for MAC CE based TCI activation / indication transmitted in slot n, the UE applies the activated / indicated TCI state (s) at slot n+N. The network entity and UE determine the value of T based on whether the TCI state is known or unknown. If the TCI state is known, the network entity and UE determine the action delay for the activated / indicated TCI based on a first TCI activation / indication delay and for DL and UL TCI state respectively; otherwise, the network entity and UE determine the action delay for the activated / indicated TCI based on a first TCI activation / indication delay and for DL and UL TCI state respectively. The time unit of the activated / indicated TCI activation / indication delay and is Tslot, e.g., the length of time slot based on NR subcarrier spacing (SCS) . For example, means
[0074] where, THARQ indicates the number of slots between the DL data transmission with the MAC CE and acknowledgement (ACK) ; indicates the number of slots in a subframe; TOk is 1 if activated / indicated TCI state is not in the active TCI state list, 0 otherwise; TOuk is 1 if activated / indicated TCI state is for CSI-RS based L1-RSRP measurement and 0 if activated / indicated TCI state is for SSB based L1-RSRP measurement when TCI state switching involves QCL-TypeD; TOuk is 1 if TCI state switching involves other QCL types only; Tfirst-SSB is the time to the first SSB transmission after the MAC CE is decoded by the UE, where the SSB is quasi-co-located (QCLed) with or configured as the source reference signal (RS) , e.g., CSI-RS, in the TCI state; TSSB-proc is the SSB processing delay, e.g., 2 millisecond (ms) ; Tslot is the slot duration in the unit of ms; TL1-RSRP indicates the delay for UE beam tracking, where the UE may measure the SSB or CSI-RS QCLed with or configured as the source RS in the TCI state; NM is 1 if the target pathloss reference signal (PL-RS) is not maintained by the UE, 0 otherwise; Tfirst-targetPLRS is the time to the first PL-RS transmission after the Layer 1 reference signal received power (L1-RSRP) measurement when the TCI state is unknown, or the time to the first PL-RS associated with the activated / indicated TCI state after the MAC CE is decoded by the UE when the TCI state is known; TtargetPLRS is the periodicity of the target PL-RS.
[0075] Fig. 3 illustrates an example diagram 300 of robust TCI activation / indication based on beam prediction, in accordance with aspects of this disclosure. As shown, the UE may optionally report 302 the UE capabilities to the network entity 104, indicating the supported configuration for TCI activation / indication based on beam prediction. For example, the UE may report at least one of the UE capabilities: whether the UE supports TCI activation / indication based on beam prediction; the maximum number of configured TCI states for beam prediction; the maximum number of activated TCI states for beam prediction in one beam prediction window; the maximum number of activated TCI states across beam prediction windows; the maximum number of beam prediction windows.
[0076] Based on the received UE capabilities, the network entity transmits 304 an RRC signaling configuring at least one of the parameters: a first TCI state list for TCI activation / indication without beam prediction, a second TCI state list for TCI activation / indication with beam prediction, a parameter enabling TCI activation / indication with beam prediction, a first action delay for TCI state activation / indication without beam prediction, a second action delay for TCI activation / indication with beam prediction. The network entity may configure TCI state list based on a downlink / joint TCI state list, e.g., dl-OrJoint-TCIStateList and / or an uplink TCI state list, e.g., ul-TCI-StateList. In some implementations, the first and second TCI state list may be the same.
[0077] The network entity then transmits 306 a medium access control (MAC) control element (CE) indicating a set of activated TCI state (s) from the configured first or second TCI state list, where the network entity may optionally indicate at least one of the information: whether the activated TCI state (s) are based on beam prediction or not; activation / deactivation of a first DL RS for QCL parameter measurement; activation / deactivation of a second DL RS for pathloss measurement; action delay for the activated TCI state. After receiving the PDSCH with the MAC CE, the UE transmits 308 an ACK to the network entity.
[0078] When the network entity activates TCI states corresponds to multiple TCI code-points by the MAC CE, the network entity may transmit 310 a DCI indicating the TCI state (s) for one of the TCI code-points, and the network entity may indicate at least one of the information by the DCI: whether the activated TCI states are selected from the ones with or without beam prediction; action delay for the indicated TCI state (s) . The network entity may schedule a PDSCH by the DCI. After receiving the DCI or the PDSCH scheduled by the DCI, the UE may transmit 312 an ACK to the network entity.
[0079] Then the network entity and UE may determine 314 the action time for the activated / indicated TCI state (s) and further communicate (e.g., downlink communication or uplink communication) based on the activated / indicated TCI state (s) .
[0080] Fig. 4 illustrates an example diagram 400 of UE behavior in robust TCI activation / indication based on beam prediction, in accordance with aspects of this disclosure. As shown, the UE optionally transmits 402 the UE capability about supported TCI activation / indication configuration based on beam prediction.
[0081] The UE then receives 404 RRC signaling configuring at least one of the following: a first TCI state list for TCI activation / indication without beam prediction, a second TCI state list for TCI activation / indication with beam prediction, a parameter enabling TCI activation / indication with beam prediction, a first action delay for TCI state activation / indication without beam prediction, and a second action delay for TCI activation / indication with beam prediction.
[0082] The UE receives 406 a MAC CE based TCI activation / indication indicating a set of activated TCI state (s) from the configured first or second TCI state list and optionally indicating at least one of the information: whether the activated TCI state (s) are based on beam prediction or not; activation / deactivation of a first DL RS for QCL parameter measurement; activation / deactivation of a second DL RS for pathloss measurement; action delay for the activated TCI state. The UE transmits 408 an ACK for the PDSCH with the MAC CE.
[0083] The UE may optionally receive 410 a DCI indicating at least one of the activated TCI states and optionally indicating at least one of the information: whether the activated TCI states are selected from the ones with or without beam prediction; action delay for the indicated TCI state (s) . The UE optionally transmits 412 an ACK for the DCI or the PDSCH scheduled by the DCI.
[0084] The UE then determines 414 the action time for the activated / indicated TCI state (s) and perform further communication (e.g., receiving downlink channels / signals or transmitting uplink channels / signals) based on the activated / indicated TCI state (s) .
[0085] Fig. 5 illustrates an example diagram 500 of network entity behavior in robust TCI activation / indication based on beam prediction, in accordance with aspects of this disclosure. The network entity behavior corresponds to the UE behavior of Fig. 4. As shown, the network entity optionally receives 502 the UE capability about supported TCI activation / indication configuration based on beam prediction.
[0086] The network entity then transmits 504 RRC signaling configuring at least one of the following: a first TCI state list for TCI activation / indication without beam prediction, a second TCI state list for TCI activation / indication with beam prediction, a parameter enabling TCI activation / indication with beam prediction, a first action delay for TCI state activation / indication without beam prediction, and a second action delay for TCI activation / indication with beam prediction.
[0087] The network entity transmits 506 a MAC CE based TCI activation / indication indicating a set of activated TCI state (s) from the configured first or second TCI state list and optionally indicating at least one of the information: whether the activated TCI state (s) are based on beam prediction or not; activation / deactivation of a first DL RS for QCL parameter measurement; activation / deactivation of a second DL RS for pathloss measurement; action delay for the activated TCI state. The UE receives 508 an ACK for the PDSCH with the MAC CE.
[0088] The network entity may optionally transmit 510 a DCI indicating at least one of the activated TCI states and optionally indicating at least one of the information: whether the activated TCI states are selected from the ones with or without beam prediction; action delay for the indicated TCI state (s) . The network entity optionally receives 512 an ACK for the DCI or the PDSCH scheduled by the DCI.
[0089] The network entity then determines 414 the action time for the activated / indicated TCI state (s) and perform further communication (e.g., transmitting downlink channels / signals or receiving uplink channels / signals) based on the activated / indicated TCI state (s) .
[0090] In this disclosure, unless otherwise specified, a RRC signaling from the network entity to UE may indicate a RRC reconfiguration message, or a System Information Block (SIB) , where the SIB may be an existing SIB (e.g., SIB1) or a new SIB (e.g., SIB J, where J is an integer above 21) transmitted by the network entity. A RRC signaling from the UE to UE may indicate UE forwarded RRC reconfiguration message.
[0091] In this disclosure, unless specified to the contrary, the network entity may receive the UE capability from a UE or from a core network (e.g., Access and Mobility Management Function (AMF) ) or another network entity.
[0092] Fig. 6a illustrates an example 600 for separate TCI configurations for TCI activation / indication with / without beam prediction, in accordance with aspects of this disclosure. As shown, the network entity may transmit an RRC configured non-beam prediction TCI state list 610 (or TCI state list without beam prediction) , one or more of the TCI states 620 are then activated by MAC CE. The network entity may also transmit an RRC configured beam- prediction TCI state list 630 (or TCI state list with beam prediction) . MAC CE then activates one or more of the TCI states 640 with beam prediction.
[0093] In an embodiment, the network entity configures TCI states with and without beam prediction in the configured TCI state list or different TCI state lists for TCI states with and without beam prediction. The UE may apply a first action delay for the activated / indicated TCI state without beam prediction and a second action delay for the activated / indicated TCI state with beam prediction, where the first and / or second delay may be predefined or configured by the network entity, and the first action delay may be smaller than, the same as or larger than the second action delay.
[0094] In one example, the network entity may configure whether a TCI state, e.g., TCI-State or TCI-UL-State, is used for beam prediction or not. Then for TCI activation / indication without beam prediction, the network entity may indicate the TCI states configured as not used for beam prediction. For TCI activation / indication with beam prediction, the network entity may indicate the TCI states configured as used for beam prediction.
[0095] In another example, the network entity may configure a first TCI state list for TCI activation / indication without beam prediction and a second TCI state list for TCI activation / indication with beam prediction. Then for TCI activation / indication without beam prediction, the network entity may indicate the TCI states from the first TCI state list. For TCI activation / indication with beam prediction, the network entity may indicate the TCI states from the second TCI state list.
[0096] Fig. 6b illustrates an example 650 for a common TCI configuration for TCI activation / indication with / without beam prediction, in accordance with aspects of this disclosure. As shown, the network entity may transmit an RRC configured common TCI state list 660, in which the TCI states include beam-prediction TCI states and non-beam-prediction TCI states. A subset of the TCI states 670 without beam prediction may then be activated by MAC CE. Another subset of the TCI states 690 with beam prediction may also be activated.
[0097] In some embodiments, the network entity may configure a common TCI state for TCI activation / indication with or without beam prediction. In one example, the network entity may configure a common downlink / joint TCI state list and / or common uplink TCI state list. Then the network entity may configure whether the activated / indicated TCI state (s) are based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay, by the MAC CE or DCI.
[0098] Fig. 7a illustrates an example 700 for a MAC CE based TCI activation / indication with / without beam prediction, in accordance with aspects of this disclosure. As shown, the network entity transmits a MAC CE 710 in the PDSCH to the UE for TCI activation or indication at time instant 715. The UE transmits at time instant 720 an ACK for the PDSCH to the network entity. The UE applies, at time instant 725, the activated TCI states when a parameter or flag (e.g., “F” ) in the MAC CE indicates no beam prediction. Alternatively, the UE applies, at time instant 730, the activated TCI states when the parameter or flag (e.g., “F” ) in the MAC CE indicates beam prediction. The time period between the time instant 720 and the time instant 725 is the first action delay 740. The time period between the time instant 720 and the time instant 730 is the second action delay 745.
[0099] In an embodiment, the network entity may transmit a MAC CE for TCI activation with or without beam prediction. The network entity may configure whether the activated TCI state (s) in a MAC CE is based on beam prediction or not. The UE may apply a first action delay for the activated / indicated TCI state without beam prediction and a second action delay for the activated / indicated TCI state with beam prediction, where the first and / or second delay may be predefined or configured by the network entity.
[0100] In some implementations, the network entity configures whether each activated TCI state is based on beam prediction or not. In one example, the network entity may indicate a bitmap in the MAC CE, where one bit is used to indicate whether one activated TCI state is based on beam prediction or not or whether the UE should apply the first or second pre-defined / configured action delay for the TCI activation / indication.
[0101] In some implementations, the network entity configures whether each activated TCI states is based on beam prediction or not according to TCI-codepoint group in the MAC CE. In one example, the network entity may assume the first four TCI-codepoints as the first TCI-codepoint group for the activated TCI states with beam prediction and the second four TCI-codepoints as the second TCI-codepoint group for the activated TCI states without beam prediction. In one example, the network entity may configure X (e.g., 1, 2, 3, 4) TCI-codepoints as the first TCI-codepoint group for the activated TCI states without beam prediction and Y (e.g., 5, 6, 7, 8) TCI-codepoints as the second TCI-codepoint group for the activated TCI states with beam prediction, where X+Y is equal to total TCI-codepoint number. Whether the UE should apply the first or second pre-defined / configured action delay for the TCI activation / indication should be based on which TCI-codepoint group belongs to.
[0102] In some other implementations, the network entity configures whether the activated TCI states corresponding to one TRP indicated by the MAC CE is based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay, by the MAC CE. In one example, the network entity and UE may determine the first TCI state for all TCI code-points corresponds to a first TRP and the second TCI state for all TCI code-points corresponds to a second TRP. In another example, the network entity and UE may determine the TCI states for the same control resource set (CORESET) pool index correspond to one TRP and the TCI states for different CORESET pool indexes correspond to different TRPs.
[0103] In some other implementations, the network entity configures whether all the activated TCI states indicated by the MAC CE are based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay. In one example, the network entity provides such configuration by one field in the MAC CE.
[0104] In some implementations, after the UE applies the activated TCI state (s) , the network entity and / or UE may determine the indicated TCI state (s) are the activated TCI state (s) corresponding to one TCI code-point, which may be pre-defined, e.g., the first one, or configured or indicated by the network entity by RRC signaling, MAC CE or DCI. The network entity and UE may communicate based on the determined indicated TCI state (s) until they received further TCI activation / indication signaling.
[0105] Fig. 7b illustrates an example 750 for the MAC CE based TCI activation / indication for multiple prediction windows with beam prediction, in accordance with aspects of this disclosure. As shown, the network entity transmits a MAC CE 760 in the PDSCH to the UE for TCI activation or indication at time instant 765. The MAC CE (s) 760 includes beam-prediction TCI states (e.g., TCI states 5 and 8) and non-beam-prediction TCI states (e.g., TCI states 1 and 3) . The UE transmits at time instant 770 an ACK for the PDSCH to the network entity. The UE applies, at time instant 775, the activated TCI states not associated with beam prediction (e.g., TCI states 1 and 3) . Alternatively, the UE applies, at time instant 780, the activated TCI states associated with beam prediction (e.g., TCI states 5 and 8) . The time period between the time instant 770 and the time instant 775 is the first action delay 785 based on a first prediction window configured by the MAC CE 760. The time period between the time instant 770 and the time instant 780 is the second action delay 790 based on a second prediction window configured by the MAC CE 760.
[0106] In an embodiment, the network entity provides the TCI activation / indication without beam prediction by a first type of MAC CE (e.g., TCI states 1 and 3 of MAC CE 760) and the TCI activation / indication with beam prediction by a second type of MAC CE (e.g., TCI state 5 and 8 of MAC CE 760) . The first type of MAC CE may be based on a first logical channel identifier (LCID) or extended LCID (eLCID) and the second type of MAC CE may be based on a second LCID or eLCID, where the first and second LCIDs / eLCIDs may be predefined or configured by the network entity.
[0107] In some implementations, the network entity may configure the activated / indicated TCI states for one prediction window by one MAC CE. The network entity may further configure the action delay for the TCI state (s) . The network entity may transmit multiple MAC CEs to configure the activated / indicated TCI states for multiple prediction windows.
[0108] In some other implementations, the network entity may configure the activated / indicated TCI states for multiple prediction windows by one MAC CE. The network entity may configure the TCI state (s) for different prediction windows corresponding to one TCI code-point or different TCI code-points. A certain value for the TCI state indication may be reserved to indicate the network entity has not predicted a TCI state for a certain prediction window.
[0109] In some implementations, after the UE applies the activated TCI state (s) , the network entity and / or UE may determine the indicated TCI state (s) are the activated TCI state (s) corresponding to one TCI code-point, which may be pre-defined, e.g., the first one, or configured or indicated by the network entity by RRC signaling, MAC CE or DCI. The network entity and UE may communicate based on the determined indicated TCI state (s) until they received further TCI activation / indication signaling.
[0110] Fig. 8a illustrates an example 800 for a common DCI format based TCI indication with / without beam prediction, in accordance with aspects of this disclosure. As shown, the network entity transmits a DCI 810 for TCI indication (e.g., TCI code-point 0 which corresponds to TCI state 1 (without beam prediction) and TCI state 13 (with beam prediction) ) , when the non-beam prediction TCI states 802 (e.g., TCI states 1, 3, 5, and 8) and the beam-prediction TCI states 804 (e.g., TCI states 13, 20, 21, and 23) have been activated. The UE transmits an ACK 812 for the PDSCH scheduled by the DCI for beam prediction or the DCI not for beam prediction. The UE applies the indicated TCI state 1 when the DCI is not for beam prediction at time instant 814. The UE applies the indicated TCI state 13 when the DCI is for beam prediction at time instant 816. The time period between the time instant 812 and the time instant 814 is the first action delay 820. The time period between the time instant 812 and the time instant 816 is the second action delay 822.
[0111] In an embodiment, the network entity may transmit a DCI for TCI indication with or without beam prediction. The network entity indicates whether the indicated TCI state (s) in a DCI is based on beam prediction or not. The UE may apply a first action delay for the indicated TCI state without beam prediction and a second action delay for the indicated TCI state with beam prediction, where the first and / or second delay may be predefined or configured by the network entity, and the first action delay may be smaller than, the same as or larger than the second action delay.
[0112] In some implementations, the network entity indicates whether the indicated TCI state (s) is based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay, by a DCI field. In one example, a 1-bit DCI field may indicate whether the indicated TCI state (s) are for beam prediction or not. In another example, the network entity may indicate whether each indicated TCI state is for beam prediction or not separately. In another example, the network entity may indicate the prediction window index for the indicated TCI state (s) , where one state of the field, e.g., the first state, may indicate the indicated TCI state (s) are for TCI indication without beam prediction.
[0113] In some other implementations, the network entity indicates whether the indicated TCI state (s) is based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay, by indicating the TCI code-point corresponding to TCI state (s) with beam prediction or not. For the TCI state (s) corresponding to each TCI code-point, the network entity may configure whether each or all the TCI state (s) are based on beam prediction or not. For the network entity may configure whether the TCI state (s) are based on beam prediction or not according to TCI-codepoint group, e.g., the first TCI code-point group with X (e.g., 1, 2, 3, 4) TCI code-points for the TCI state (s) with beam prediction and the second TCI code-point group with Y (e.g., 5, 6, 7, 8) TCI code-points for the TCI state (s) without beam prediction, where X+Y is equal to total TCI code-point number.
[0114] In some other implementations, the network entity indicates whether the indicated TCI state (s) is based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay, by the radio network temporal identifier (RNTI) associated with the DCI. In one example, one RNTI may be configured or pre-defined for TCI indication with beam prediction, and another RNTI may be configured or pre-defined for TCI indication without beam prediction.
[0115] In some other implementations, the network entity indicates whether the indicated TCI state (s) is based on beam prediction or not, e.g., whether to apply the first action delay or the second action delay, by the location of the PDCCH with the DCI, e.g., starting control channel element (CCE) index. In one example, PDCCH with odd starting CCE index may be for TCI indication with beam prediction, and PDCCH with even starting CCE index may be for TCI indication without beam prediction.
[0116] Fig. 8b illustrates an example 830 for TCI indication with beam prediction for multiple beam prediction windows, in accordance with aspects of this disclosure. As shown, the network entity transmits a DCI 840 for TCI indication (e.g., TCI code-point 0 which corresponds to TCI state 1 (without beam prediction) and TCI state 13 (with beam prediction) ) , when the TCI states 832 (e.g., TCI states 1, 3, 5, and 8) have been activated for prediction window 1 and the TCI states 834 (e.g., TCI states 13, 20, 21, and 23) have been activated for prediction window 2. The UE transmits an ACK 842 for the PDSCH scheduled by the DCI for beam prediction or the DCI not for beam prediction. The UE applies the indicated TCI state 1 when the DCI is not for beam prediction at time instant 844. The UE applies the indicated TCI state 13 when the DCI is for beam prediction at time instant 846. The time period between the time instant 842 and the time instant 844 is the first action delay 850. The time period between the time instant 842 and the time instant 846 is the second action delay 855.
[0117] In an embodiment, the network entity may indicate TCI state (s) with and without beam prediction by different DCI formats. In one example, the network entity may indicate the TCI state (s) without beam prediction by DCI format 1_1 and 1_2. The network entity may indicate the TCI state (s) with beam prediction by another DCI format, e.g., DCI format 1_4 or 2_10. The network entity may indicate the TCI state (s) for one or more than one prediction windows. In one example, the network entity indicates the TCI states for one prediction window by one DCI field. In another example, the network entity indicates the TCI states for multiple prediction windows by one DCI field, where the network entity may configure the TCI state (s) for multiple prediction windows corresponding to one TCI code-point by the MAC CE.
[0118] Fig. 8c illustrates an example 860 for TCI indication based on the activated TCI states at the action time for the TCI indication, in accordance with aspects of this disclosure. As shown, the network entity transmits a DCI 870 for TCI indication (e.g., TCI code-point 0 which corresponds to TCI state 1 (without beam prediction) and TCI state 13 (with beam prediction) ) , when the TCI states 862 (e.g., TCI states 1, 3, 5, and 8) and 864 (e.g., TCI states 13, 20, 21, and 23) have been activated. The UE transmits an ACK 872 for the PDSCH scheduled by the DCI for beam prediction or the DCI not for beam prediction. The UE applies the indicated TCI state 1 when the DCI is not for beam prediction at time instant 874. The UE applies the indicated TCI state 13 (or continues to use TCI state 1) when the DCI is for beam prediction at time instant 876. The time period between the time instant 872 and the time instant 874 is the first action delay 880.
[0119] In another embodiment, the network entity indicates the TCI state (s) by DCI based on the activated TCI states at a certain time, where the time may be predefined, the first slot to apply the indicated TCI state (s) or the first / last symbol of the DCI, or configured by the network entity by RRC signaling or MAC CE or DCI.
[0120] In some implementations, after the UE applies activated TCI states from a TCI indication with / without beam prediction, the UE may continue to use the previously indicated TCI state (s) until the UE receives TCI indication. In some other implementations, after the UE applies activated TCI states from a TCI indication with / without beam prediction, the UE may update the indicated TCI state based on the activated TCI states and / or the TCI code-point indicated by DCI. In one example, the UE may apply the indicated TCI based on the activated TCI states corresponding to the indicated TCI code-point. In another example, the UE may apply the indicated TCI based on the activated TCI state (s) corresponding to a pre-defined TCI code-point, e.g., the first TCI code-point.
[0121] Fig. 9a illustrates an example 900 for the TCI activation / indication based on periodic downlink (DL) reference signal (RS) , in accordance with aspects of this disclosure. For the TCI state with beam prediction, the network entity may configure a first periodic DL RS, e.g., SSB or CSI-RS, in the TCI state or QCLed with the DL RS for QCL indication in the TCI state, and the network entity may configure a second periodic DL RS, e.g., SSB or CSI-RS, in the TCI state or associated with the TCI state, as PL-RS. The network entity may provide the configuration by RRC signaling, MAC CE, or DCI. The network entity may configure the same DL RS or different DL RSs as the first periodic DL RS and second periodic DL RS. Then the UE may measure the first periodic DL RS for QCL measurement and the second periodic DL RS for pathloss measurement for the activated / indicated TCI state.
[0122] As shown in Fig. 9a, the UE first receives the PDSCH with MAC CE for TCI activation / indication at time instant 910. The UE then transmits 912 an ACK for the PDSCH. The UE uses the second periodic DL RS resource for pathloss measurement at time instant 914. The UE uses the first periodic DL RS resource for QCL measurement at time instant 916. The UE uses the second periodic DL RS resource for pathloss measurement at time instant 918. The UE uses the second periodic DL RS resource for pathloss measurement at time instant 920. From the time instant 910 to beyond the time instant 920, an action delay 922 for the activated / indicated TCI is used.
[0123] Fig. 9b illustrates an example for the semi-persistent DL RS based QCL / pathloss measurement for activated / indicated TCI state (s) , in accordance with aspects of this disclosure. The network entity may activate a first semi-persistent DL RS, e.g., semi-persistent CSI-RS or SSB with dynamic activation / deactivation, QCLed with or configured as the DL RS for QCL-TypeD (spatial reception parameters) indication in the TCI state. The network entity may activate a second semi-persistent DL RS, e.g., semi-persistent CSI-RS or SSB with dynamic activation / deactivation, as PL-RS associated with or configured in the TCI state. The network entity may activate a third semi-persistent DL RS, e.g., semi-persistent CSI-RS or SSB with dynamic activation / deactivation, QCLed with or configured as the DL RS for QCL-TypeA (average delay, delay spread, Doppler shift and Doppler spread) indication. The network entity may configure the same DL RS or different DL RSs as the first semi-persistent DL RS, second semi-persistent DL RS and / or third semi-persistent DL RS. Then the UE may measure the first semi-persistent DL RS for QCL-TypeD measurement, the second DL RS for pathloss measurement, and the third semi-persistent DL RS for QCL-TypeA measurement for the activated / indicated TCI state.
[0124] In some implementations, the network entity may activate the first / second / third semi-persistent DL RS by the same MAC CE for TCI activation / indication. In one example, the network entity may configure the first semi-persistent DL RS as the DL RS for QCL-TypeD indication or QCLed with the DL RS for QCL-TypeD indication in the TCI state, the network entity may configure the second semi-persistent DL RS as the PL-RS in or associated with the TCI state, and the network entity may configure the third semi-persistent DL RS as the DL RS for QCL-TypeA indication or QCLed with the DL RS for QCL-TypeA indication in the TCI state. The first / second / third DL RS may be activated if the corresponding TCI state are activated, and may be deactivated if the corresponding TCI state are deactivated.
[0125] In some other implementations, the network entity may activate the first / second / third semi-persistent DL RS by MAC CE (s) other than the MAC CE for TCI activation / indication.
[0126] As shown in Fig. 9b, the UE first receives the PDSCH with MAC CE for TCI activation / indication at time instant 932. The UE then transmits 934 an ACK for the PDSCH. The UE uses the first semi-persistent DL RS resource for QCL-TypeD measurement at time instant 936. The UE uses the third semi-persistent DL RS resource for QCL Type A measurement at time instant 938. The UE uses the second semi-persistent DL RS resource for pathloss measurement at time instant 940. The UE uses the second semi-persistent DL RS resource for pathloss measurement 942. From the time instant 910 to beyond the time instant 942, an action delay 950 for the activated / indicated TCI is used.
[0127] Fig. 9c illustrates an example 960 for QCL / pathloss measurement based on the periodic, semi-persistent, and / or aperiodic DL RS, in accordance with aspects of this disclosure. The network entity may configure a first periodic / semi-persistent DL RS, e.g., CSI-RS or SSB, QCLed with or configured as the DL RS for QCL-TypeD indication in the TCI state. The network entity may configure a second periodic / semi-persistent DL RS, e.g., CSI-RS or SSB, as PL-RS associated with or configured in the TCI state. The network entity may configure a third periodic / semi-persistent DL RS, e.g., CSI-RS or SSB, QCLed with or configured as the DL RS for QCL-TypeA indication. The network entity may configure the same DL RS or different DL RSs as the first DL RS, second DL RS and / or third DL RS.
[0128] In some implementations, for unknown TCI state, the network entity may trigger a first set of aperiodic DL RS resources, e.g., aperiodic CSI-RS resources, for QCL-TypeD, where the network entity may configure the CSI-RS resources are from the same antenna port (s) , e.g., repetition is set as ‘on’ , and the CSI-RS resources are QCLed with the DL RS for QCL indication in the activated / indicated TCI state. The network entity may trigger the first set of aperiodic DL RS resources by the MAC CE for TCI activation / indication or a separate DCI. The network entity may trigger at least N aperiodic DL RS resources for UE beam tracking, where N may be pre-defined, e.g., N=8, or reported by the UE capability.
[0129] In some implementations, for TCI state without the pathloss maintained, the network entity may trigger a second set of aperiodic DL RS resources, e.g., aperiodic CSI-RS resources, for pathloss measurement, where the network entity may configure the CSI-RS resources are from the same antenna port (s) , e.g., repetition is set as ‘on’ , and the CSI-RS resources are QCLed with the PL-RS in or associated with the activated / indicated TCI state. The network entity may trigger the second set of aperiodic DL RS resources by the MAC CE for TCI activation / indication. The network entity may trigger at least N aperiodic DL RS resources for pathloss measurement, where M may be pre-defined, e.g., M=5, or reported by the UE capability.
[0130] In some implementations, the network entity may trigger a third set of aperiodic DL RS resources, e.g., aperiodic CSI-RS resources, for QCL-TypeA measurement, where the network entity may configure the CSI-RS resources are tracking reference signal (TRS) , e.g., CSI-RS resources in a CSI-RS resource set with trs-Info configured, and the CSI-RS resources are QCLed with the DL RS for QCL indication in the activated / indicated TCI state. The network entity may trigger the third set of aperiodic DL RS resources by the MAC CE for TCI activation / indication or a separate DCI.
[0131] The network entity may transmit the first aperiodic DL RS resource set X symbols before the second / third aperiodic DL RS resource set, where X is to reserve some time for the UE processing for beam measurement for the first aperiodic DL RS resource set and UE beam identification, and the value of X may be pre-defined, e.g., 14 symbols, or reported by the UE capability.
[0132] Then the UE may measure the first / second / third aperiodic DL RS resource set (s) for QCL-TypeA / QCL-TypeD / pathloss measurement for the activated / indicated TCI state after receiving the TCI activation / indication signaling and before applying the activated / indicated TCI state. After applying the activated / indicated TCI state, the UE measure the first / second / third periodic / semi-persistent DL RS (s) for QCL-TypeA / QCL-TypeD / pathloss measurement.
[0133] As shown in Fig. 9c, the UE first receives the PDSCH with MAC CE for TCI activation / indication at time instant 962. The UE then uses the first set of aperiodic DL RS resources for QCL-TypeD measurement at time instant 964. The UE uses the second set of aperiodic DL RS resources for pathloss measurement at time instant 966. The UE uses the third set of aperiodic DL RS resources for QCL-TypeA measurement at time instant 968. The UE transmits an ACK for the PDSCH at time instant 970.
[0134] The UE applies the activated TCI states at time instant 972. The UE uses the first periodic / semi-persistent DL RS resource for further QCL-TypeD measurement at time instant 974. The UE uses the second periodic DL RS resource for further pathloss measurement at time instant 976. The UE uses the third DL RS resource (s) for QCL-TypeA measurement at time instant 978. The time period between the time instant 970 and the time instant 972 is the action delay 980 for the activated / indicated TCI.
[0135] In an embodiment, the network entity and / or UE may determine the action time and / or action delay for the activated / indicated TCI state (s) based on whether the TCI state (s) are unknown, known or predicted. The network entity and / or UE may determine different action delays for the unknown / known / predicted TCI states. For predicted TCI state (s) , the network entity and / or UE may further determine whether the predicted TCI state (s) are unknown or known. The network entity and / or UE may determine different action delays for the unknown / known predicted TCI state (s) .
[0136] In one example, the network entity and / or UE may determine the known / unknown status for a predicted downlink TCI state based on the following. The downlink TCI state for beam prediction is known if / when the following conditions are met:
[0137] - During the period
[0138] ○ From the last transmission of the RS resource used for the L1-RSRP measurement reporting for the target downlink TCI state to the completion of active downlink TCI state switch, where the RS resource for L1-RSRP measurement is the RS in target downlink TCI state or QCLed to the target downlink TCI state
[0139] ○ Downlink TCI state switch command is received and / or the beam prediction window for the target downlink TCI state is within Z ms (e.g., Z=1280) upon the last transmission of the RS resource for beam reporting or measurement with or without UE-side beam prediction
[0140] ○ The UE has sent at least 1 measured or predicted L1-RSRP report for the target downlink TCI state before the downlink TCI state switch command or the beam prediction window for the target downlink TCI state
[0141] ○ The target downlink TCI state remains detectable during the downlink TCI state switching period
[0142] ■ The SSB associated with the downlink TCI state remain detectable during the downlink TCI switching period
[0143] ● SNR of the downlink TCI state ≥ -3dB
[0144] ● The SSB can be associated with either the serving cell PCI or a PCI different from serving cell PCI.
[0145] Otherwise, the downlink TCI state is unknown.
[0146] In one example, the network entity and / or UE may determine the known / unknown status for a predicted uplink TCI state as follows:
[0147] The uplink TCI state for beam prediction is known if the following conditions are met:
[0148] - During the period from the last transmission of the RS resource used for the L1-RSRP measurement reporting for the target uplink TCI state to the completion of active uplink TCI state switch, where the RS resource for L1-RSRP measurement is the RS in target uplink TCI state or QCLed to the target uplink TCI state
[0149] ○ Uplink TCI state switch command is received and / or the beam prediction window for the target uplink TCI state is within Z ms (e.g., Z=1280) upon the last transmission of the RS resource for beam reporting or measurement with or without UE-side beam prediction
[0150] ○ The UE has sent at least 1 measured or predicted L1-RSRP report for the target uplink TCI state before the uplink TCI state switch command or the beam prediction window for the target uplink TCI state
[0151] ○ The RS configured in target uplink TCI state remains detectable during the uplink TCI state switching period
[0152] ■ SNR of the RS configured in target uplink TCI state ≥ -3dB
[0153] ○ The target uplink TCI state remains detectable during the uplink TCI state switching period
[0154] ○ The SSB associated with the uplink TCI state remain detectable during the uplink TCI switching period
[0155] ■ SNR of the uplink TCI state ≥ -3dB
[0156] ■ The SSB can be associated with either the serving cell PCI or a PCI different from serving cell PCI.
[0157] Otherwise, the uplink TCI state is unknown.
[0158] In some implementations, in an L1-RSRP report, the UE may report whether the L1-RSRP is measured L1-RSRP or predicted L1-RSRP. The NE may configure the UE to report the information. Alternatively, the NE may configure the UE to report measured L1-RSRP or predicted L1-RSRP for each reported SSB or CSI-RS in a L1-RSRP or for a L1-RSRP report. The condition to determine the unknown / known TCI above may only consider the beam report with measured L1-RSRP only.
[0159] In some other implementations, the network entity and UE may determine the predicted TCI state (s) as unknown TCI state (s) . Thus, the network entity and UE may determine the action delay for predicted TCI state (s) as the action delay for unknown TCI state (s) .
[0160] In some other implementations, the starting point of beam prediction window Tpred ms may be from either of the following:
[0161] ● Tpred1: The time slot when receiving TCI activation / indication signaling
[0162] ● Tpred2: The time slot when ACK transmission for TCI activation / indication signaling
[0163] In an embodiment, for the TCI activation / indication with beam prediction, the UE may measure the QCL / pathloss before or after the beam prediction window indicated by the network entity. The network entity may configure the beam prediction window based on Tpred1 with the associated predicted TCI state list {TCIp#1, TCIp#2, …} and sends TCI activation / indication signaling to the UE. For the old or previously activated / indicated TCI state (s) in the predicted TCI state list, the UE starts QCL / pathloss measurement for the target activated / indicated TCI state (s) after the prediction window. In some implementations, the UE may start QCL / pathloss measurement for the target activated / indicated TCI state (s) before the prediction window, e.g., the prediction window is still active, if a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before the prediction window is indicated to the network. For the old or previously TCI state (s) not in the predicted TCI state list {TCIp#1, TCIp#2, …} , the UE may or may not start QCL / pathloss measurement for the target activated / indicated TCI state (s) before the prediction window depending on whether a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) is indicated to the network or not. The UE may communicate with the network entity based on the old or previously activated / indicated TCI state before the beam prediction window is expired. Then, the network entity and the UE determine the action delay for the target activated / indicated TCI (s) based on at least one of the following information:
[0164] ● Tpred1: the beam prediction window, where the starting point is the time slot when receiving TCI activation / indication signaling
[0165] ● Tpred2: the beam prediction window, where the starting point is the time slot when ACK transmission for TCI activation / indication signaling
[0166] ● Whether the old or previously activated / indicated TCI state (s) is in the predicted TCI state list or not
[0167] ● Whether the UE starts QCL / pathloss measurement for the target activated / indicated TCI state (s) before or after the prediction window
[0168] ● Whether the target activated / indicated TCI state (s) is known or unknown
[0169] ● THARQ: the number of slots between the DL data transmission with the MAC CE and acknowledgement (ACK)
[0170] ● the number of slots in a subframe
[0171] ● T′first-SSB: the time to the first SSB transmission after the prediction time window for the activated / indicated TCI or after the TCI activation / indication signaling is decoded by the UE
[0172] ● TOk: whether the target activated / indicated TCI state (s) is not in the active TCI state list or not when the target activated / indicated TCI state (s) is known
[0173] ● TOuk: whether the target activated / indicated TCI state (s) is not in the active TCI state list or not when the target activated / indicated TCI state (s) is unknown
[0174] ● TSSB-proc: SSB processing delay
[0175] ● Tslot: the slot duration in the unit of ms
[0176] ● TL1-RSRP: the delay for UE beam tracking, where the UE may measure the SSB or CSI-RS QCLed with or configured as the source RS in the activated / indicated TCI state (s)
[0177] ● NM: whether the target pathloss reference signal (PL-RS) is maintained or not
[0178] ● Tfirst-targetPLRS:
[0179] ● the time to the first PL-RS transmission after the Layer 1 reference signal received power (L1-RSRP) measurement when the TCI state is unknown,
[0180] ● or the time to the first PL-RS associated with the activated / indicated TCI state after the TCI activation / indication signaling is decoded by the UE when the TCI state is known;
[0181] ● TtargetPLRS: the periodicity of the target PL-RS
[0182] In some implementations, if a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before the prediction window is indicated to the network, the UE may start QCL / pathloss measurement for the target activated / indicated TCI state (s) after receiving TCI activation / indication signaling.
[0183] In some implementations, if a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before the prediction window is indicated to the network, the UE may start QCL / pathloss measurement for the target activated / indicated TCI state (s) after transmitting the ACK for the TCI activation / indication signaling.
[0184] In some implementations, the NE may configure whether the UE should start the QCL / pathloss measurement before or after the beam prediction window. The NE may transmit the configuration by RRC signaling, MAC CE, or DCI. The NE may provide the configuration per TCI state, per bandwidth part, per serving cell or per serving cell group.
[0185] In one example, for TCI activation / indication with beam prediction, if the starting point of beam prediction window Tpred1 and upon receiving PDSCH with MAC CE for TCI activation / indication at the target TCI state (s) are both assumed transmitted in slot n’, the UE applies the activated / indicated TCI state (s) at slot n’+K. The network entity and UE determine the value of K based on whether the target activated / indicated TCI state is known or unknown. If the TCI state is known, the network entity and UE determine the action delay K for the target activated / indicated TCI based on a first TCI activation / indication delay and for DL and UL TCI state respectively; otherwise, the network entity and UE determine the action delay K for the target activated / indicated TCI based on a second TCI activation / indication delay and for DL and UL TCI state respectively.
[0186] In some implementations, are determined by the following. In some implementations, this may be for the one of the following conditions:
[0187] ● the old or previous activated / indicated TCI state (s) is in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is not indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) after prediction window,
[0188] ● the old or previous activated / indicated TCI state (s) is not in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is not indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) after prediction window.
[0189] Where,
[0190] ● Tpred1: the beam prediction window in the unit of Tslot, where the starting point is the time slot when receiving PDSCH with MAC CE for TCI activation / indication
[0191] ● T′first-SSB is the time to the first SSB transmission after the prediction time window for the activated / indicated TCI or after the MAC CE is decoded by the UE, where the SSB is QCLed with or configured as the DL RS for QCL indication in the TCI state;
[0192] ● T′first-targetPLRS is the time to the first PL-RS transmission after the Layer 1 reference signal received power (L1-RSRP) measurement when the TCI state is unknown, and the time to the first PL-RS associated with the activated / indicated TCI state after the prediction time window for the activated / indicated TCI or after the MAC CE is decoded by the UE when the TCI state is known;
[0193] ● TtargetPLRS is the periodicity of the target PL-RS.
[0194] ● TOk: whether the target activated / indicated TCI state (s) is not in the active TCI state list or not;
[0195] ● 1: not in the active state list
[0196] ● 0: in the active state list
[0197] ● TOuk whether the target activated / indicated TCI state (s) is not in the active TCI state list or not when the target sactivated / indicated TCI state (s) is unknown
[0198] ● is 1 if activated / indicated TCI state is for CSI-RS based L1-RSRP measurement and 0 if activated / indicated TCI state is for SSB based L1-RSRP measurement when TCI state switching involves QCL-TypeD;
[0199] ● is 1 if TCI state switching involves other QCL types only
[0200] ● NM: whether the target pathloss reference signal (PL-RS) is maintained or not;
[0201] ● 1: target PL-RS is not maintained
[0202] ● 0: target PL-RS is maintained
[0203] In some implementations, are determined by the following. In some implementations, this may be for the one of the following conditions:
[0204] ● the old or previous activated / indicated TCI state (s) is in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window
[0205] ● the old or previous activated / indicated TCI state (s) is not in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window.
[0206] In some implementations, if the UE supports AI / ML model at the UE side for temporal beam prediction for the pair of DL beam and UE Rx / Tx beam, at least one of following conditions may be applied to determine
[0207] ● TL1-RSRP=0
[0208] ● T′first-SSB+TSSB-proc=0
[0209] ● TOk=0
[0210] ● TOuk=0
[0211] ● T′first-targetPLRS+4TtargetPLRS+2=0
[0212] In some implementations, the UE may report whether it supports the apply activated / indicated TCI state without additional UE beam measurement, without QCL measurement, and / or without pathloss measurement. Thus, the UE may have identified the UE beam, QCL information and / or pathloss measurement for the activated / indicated TCI state. The UE may report the information by UE capability or uplink control information (UCI) on PUCCH or PUSCH or MAC CE.
[0213] In one example, if the UE supports AI / ML model at the UE side for temporal beam prediction for the pair of DL beam and UE Rx / Tx beam, may be determined as or
[0214] Fig. 10a illustrates an example 1000 for the QCL / pathloss measurement for the TCI activation / indication with beam prediction before the beam prediction window, in accordance with aspects of this disclosure. As shown, the UE may communicate with the network entity first based on previously activated / indicated TCI states in time period 1010, then in the time period 1012 UE may determine QCL / pathloss measurement for activated / indicated TCI states in the TCI activation / indication for beam prediction. The UE then communicates with the network entity in time period 1014 based on activated / indicated TCI state (s) in the TCI activation / indication for beam prediction. During the time period 1010, the UE receives TCI activation / indication with beam prediction at time instant 1002. The UE transmits an ACK for the TCI activation / indication with beam prediction at time instant 1004. The time period 1012 includes the prediction window 1006 and is separated from the time period 1014 when the UE applies the activated / indicated TCI states at time instant 1008.
[0215] Fig. 10b illustrates an example 1030 for the QCL / pathloss measurement for the TCI activation / indication with beam prediction after the beam prediction window, in accordance with aspects of this disclosure. For TCI activation / indication with beam prediction, if the starting point of beam prediction window Tpred2 and upon receiving PDSCH with MAC CE for TCI activation / indication at the target TCI state (s) are both assumed transmitted in slot n, the UE applies the activated / indicated TCI state (s) at slot n+M. The network entity and UE determine the value of M based on whether the TCI state is known or unknown. If the TCI state is known, the network entity and UE determine the action delay M for the activated / indicated TCI based on a first TCI activation / Indication delay and for DL and UL TCI state respectively; otherwise, the network entity and UE determine the action delay M for the activated / indicated TCI based on a second TCI activation / indication delay and for DL and UL TCI state respectively.
[0216] In some implementations, are determined by the following. In some implementations, this may be for the one of the following conditions:
[0217] ● the old or previous activated / indicated TCI state (s) is in in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is not indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) after prediction window,
[0218] ● the old or previous activated / indicated TCI state (s) is not in in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is not indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) after prediction window
[0219] Where,
[0220] Tpred2: the beam prediction window in the unit of Tslot, where the starting point is the time slot when ACK transmission for PDSCH with MAC CE for TCI activation / indication
[0221] In some implementations, are determined by the following. In some implementations, this may be for the one of the following conditions:
[0222] ● the old or previous activated / indicated TCI state (s) is in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window
[0223] ● the old or previous activated / indicated TCI state (s) is not in the predicted TCI state list and a UE capability bit to support QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window is indicated or the NE configures the UE to start QCL / pathloss measurement for the target activated / indicated TCI state (s) before prediction window
[0224] In some implementations, if the UE supports AI / ML model at the UE side for temporal beam prediction for the pair of DL beam and UE Rx / Tx beam, at least one of following conditions may be applied to determine
[0225] ● TL1-RSRP=0
[0226] ● T′first-SSB+TSSB-proc=0
[0227] ● TOk=0
[0228] ● TOuk=0
[0229] ● T′first-targetPLRS+4TtargetPLRS+2=0
[0230] In some implementations, the UE may report whether it supports to apply activated / indicated TCI state without additional UE beam measurement, without QCL measurement, and / or without pathloss measurement. Thus, the UE may have identified the UE beam, QCL information and / or pathloss measurement for the activated / indicated TCI state. The UE may report the information by UE capability or uplink control information (UCI) on PUCCH or PUSCH or MAC CE.
[0231] In one example, if the UE supports AI / ML model at the UE side for temporal beam prediction for the pair of DL beam and UE Rx / Tx beam, may be determined as or
[0232] In some implementations, after the beam prediction window and before the UE applies the activated / indicated TCI state (s) , the network entity may refrain from scheduling downlink / uplink channel, e.g., PDCCH / PDSCH / PUSCH / PUCCH, for the UE, and the UE may refrain from receiving downlink channel or transmitting uplink channel, e.g., PDCCH / PDSCH / PUSCH / PUCCH.
[0233] In some other implementations, after the beam prediction window and before the UE applies the activated / indicated TCI state (s) , the network entity and UE may communicate based on previously activated / indicated TCI state. In some other implementations, after the beam prediction window and before the UE applies the activated / indicated TCI state (s) , the network entity and UE may communicate based on the activated / indicated TCI state, and the network entity may refrain from scheduling the UE to receive a downlink signal or transmit an uplink signal based on multiple layer transmission and / or modulation and coding scheme (MCS) higher than a threshold, where the threshold may be predefined or reported by the UE capability. In one example, the network entity may schedule the uplink or downlink signal by DCI format 0_0 or 1_0 respectively.
[0234] The example 1030 of Fig. 10b shows the QCL / pathloss measurement for the TCI activation / indication with beam prediction after the beam prediction window. As shown, the UE may communicate with the network entity first based on previously activated / indicated TCI states in time period 1040, then in the time period 1042 UE may determine QCL / pathloss measurement for activated / indicated TCI states in the TCI activation / indication for beam prediction. The UE then communicates with the network entity in time period 1044 based on activated / indicated TCI state (s) in the TCI activation / indication for beam prediction. During the time period 1040, the UE receives TCI activation / indication with beam prediction at time instant 1032. The UE transmits an ACK for the TCI activation / indication with beam prediction at time instant 1034. The time period 1042 includes the prediction window 1036 and is separated from the time period 1044 when the UE applies the activated / indicated TCI states at time instant 1038.
[0235] Fig. 10c illustrates an example 1060 for the QCL / pathloss measurement for the TCI activation / indication with beam prediction after 3 slots after transmitting ACK for the TCI activation / indication signaling, in accordance with aspects of this disclosure. For the TCI activation / indication with beam prediction, the network entity may configure the beam prediction window for the activated / indicated TCI state (s) , and the UE starts QCL / pathloss measurement after X slots after receiving the TCI activation / indication signaling or after Y slots after transmitting the ACK for the TCI activation / indication signaling, where X and Y may be predefined or configured by the network entity or reported by the UE capability. Then the UE determines the action time for the TCI activation / indication based on the action delay and the beam prediction window. The UE may communicate with the network entity based on the previously activated / indicated TCI state before the beam prediction window or the action time for the activated / indicated TCI state.
[0236] In another example, for TCI activation / indication with beam prediction transmitted in slot n, the UE applies the activated / indicated TCI state (s) at slot n+P, where P = min (N, N’) or P = max (N, N’) , and N’ indicates the time from the TCI activation / indication signaling to the end of beam prediction window.
[0237] Fig. 10c illustrates one example for the QCL / pathloss measurement for the TCI activation / indication with beam prediction after 3 slots after transmitting the ACK for the TCI activation / indication signaling. As shown, the UE receives TCI activation or indication with beam prediction at time instant 1062. The UE transmits an ACK for the TCI activation / indication with beam prediction at time instant 1064. Thereafter, an action delay 1070 for the TCI activation / indication signaling is applied. After the action delay 1070, in a time period 1072 for UE to determine QCL / pathloss measurement for activated / indicated TCI states in the TCI activation / indication for beam prediction. The time period 1072 includes the prediction window 1066. The UE applies the activated / indicated TCI state (s) at time instant 1068 following the time period 1072.
[0238] In an embodiment, the network entity may configure whether the UE should start QCL / pathloss measurement for activated / indicated TCI state after the beam prediction window or after X slots after receiving the TCI activation / indication signaling or after Y slots after transmitting the ACK for the TCI activation / indication signaling. The network entity may provide the configuration by RRC signaling or MAC CE or DCI.
[0239] In some implementations, the UE may report the UE capability indicating whether the UE supports to start QCL / pathloss measurement for activated / indicated TCI state after the beam prediction window and / or after X slots after receiving the TCI activation / indication signaling and / or after Y slots after transmitting the ACK for the TCI activation / indication signaling.
[0240] In some implementations, the network entity and UE may determine whether the UE should start QCL / pathloss measurement for activated / indicated TCI state after the beam prediction window or after X slots after receiving the TCI activation / indication signaling or after Y slots after transmitting the ACK for the TCI activation / indication signaling based on at least one of the following factors: whether the TCI state is known or unknown, the beam prediction window length, number of previously and newly activated TCI states and UE capability of supported maximum number of supported activated TCI states.
[0241] In one example, if the TCI state is unknown, the UE may start the QCL / pathloss measurement after receiving the TCI activation / indication signaling or after transmitting the ACK for the TCI activation / indication signaling; otherwise, the UE may start the QCL / pathloss measurement after the beam prediction window.
[0242] In one example, if the beam prediction window is larger than a threshold, the UE may start the QCL / pathloss measurement after receiving the TCI activation / indication signaling or after transmitting the ACK for the TCI activation / indication signaling; otherwise, the UE may start the QCL / pathloss measurement after the beam prediction window. The threshold may be predefined, e.g., 320ms, or configured by the network entity, or reported by the UE.
[0243] In one example, if number of previously and newly activated TCI states is smaller than or equal to the UE capability of supported maximum number of supported activated TCI states, the UE may start the QCL / pathloss measurement after receiving the TCI activation / indication signaling or after transmitting the ACK for the TCI activation / indication signaling; otherwise, the UE may start the QCL / pathloss measurement after the beam prediction window.
[0244] Fig. 10d illustrates an example 1080 for when TCI action time for a first prediction window is after a second beam prediction window, in accordance with aspects of this disclosure. If the action time for activated / indicated TCI state (s) for a first beam prediction window is after a second beam prediction window, the UE may not apply the activated / indicated TCI state (s) corresponding to the first beam prediction window, and the UE may use the previously activated / indicated TCI state (s) to communicate with the network entity. Alternatively, the UE may not apply the activated / indicated TCI state (s) corresponding to the second beam prediction window, and the UE may continue to use the activated / indicated TCI state (s) to communicate with the network entity until applying new activated / indicated TCI state (s) in a third beam prediction window or from a new signaling. Alternatively, the UE may start the QCL / pathloss measurement for the TCI state (s) corresponding to the second beam prediction window after Z slots after the action time of the TCI state (s) corresponding to the first beam prediction window, where Z may be pre-defined or configured by the network entity or reported by the UE.
[0245] Fig. 10d illustrates one example for the case when TCI action time for a first prediction window is after a second beam prediction window. As shown, an action delay 1090 is provided for TCI states for the first prediction window. The UE may ignore the TCI states for the first prediction window or the second prediction window, or the UE may start QCL / pathloss measurement for the TCI state (s) for the second prediction window after slot 153. The UE receives TCI activation or indication with beam prediction at time instant 1082. The UE transmits an ACK for the TCI activation / indication with beam prediction at time instant 1084. The UE encloses a first prediction window at time instant 1086 (e.g., slot 111) and encloses a second prediction window at time instant 1088 (e.g., slot 152) .
[0246] In an embodiment, the network entity and UE may determine the common target channel (s) / RS (s) for the activated / indicated TCI with and without beam prediction. Thus, for a first set of channels / RSs, e.g., channels / RSs in the first row in Table 1, the network entity and UE may always apply the activated / indicated TCI state (s) . For a second set of channels / RSs, e.g., channels / RSs in the second row in Table 1, the network entity may configure whether to apply at least one of the activated / indicated TCI state (s) by RRC signaling, MAC CE or DCI. For a third set of channels / RSs, e.g., channels / RSs in the third row in Table 1, the network entity and UE may determine the activated / indicated TCI state with and without beam prediction are not applied, and the network entity may configure the TCI state with and without beam prediction based on a separate signaling, e.g., RRC or MAC CE.
[0247] In an embodiment, the network entity and UE may determine different target channels / RSs for TCI activation / indication with and without beam prediction. The network entity and UE may determine a first set of target channel (s) / RS (s) always to apply the activated / indicated TCI state with beam prediction. In one example, the first set of target channel (s) / RS (s) may be the same as the channels / RSs in the first row in Table 1. The network entity may configure whether a second set of target channel (s) / RS (s) to apply the activated / indicated TCI state with beam prediction or not. In one example, the second set of target channel (s) / RS (s) may be the same as the channels / RSs in the second row in Table 1. For each channel / RS in the second set of target channel (s) / RS (s) , the network entity may configure whether to apply none of or one of or multiple of activated / indicated TCI state (s) with and without beam prediction by separate configurations.
[0248] For the channel (s) / RS (s) not to apply the activated / indicated TCI state for beam prediction, in some implementations, the network entity may configure the activated / indicated TCI state (s) with beam prediction by separate MAC CE; in some other implementations, the network entity may refrain from configuring the activated / indicated TCI state (s) with beam prediction. In one example, the network entity may transmit a MAC CE activating / indicating TCI state (s) with beam prediction for multiple channels, e.g., channels / RSs in the first row and the second row in Table 1 configured to share the activated / indicated TCI state (s) , and the network entity may transmit another MAC CE activating / indicating TCI state (s) with beam prediction for a channel that does not share the activated / indicated TCI state (s) .
[0249] Fig. 11 illustrates a flowchart of a method 1100 of wireless communication at a UE. With reference to Fig. 1, 3-5, and 13, the method may be performed by the UE 102, the UE apparatus 1302, etc., which may include the memory 1326', 1306', 1316, and which may correspond to the entire UE 102 or the entire UE apparatus 1302, or a component (e.g., the TCI states component 140) of the UE 102 or the UE apparatus 1302, such as the wireless baseband processor 1326 and / or the application processor 1306.
[0250] As shown in Fig. 11, the UE optionally transmits 1102, to a network entity, an indication of capability on supported TCI activation or indication configuration based on beam prediction (similar to operations 302 and 402 of Figs. 3 and 4) .
[0251] The UE receives 1104, from the network entity, a first control signaling indicating: at least one beam-prediction transmission configuration indicator (TCI) state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay (similar to operations 304 and 404 of Figs. 3 and 4) .
[0252] The UE receives 1106, from the network entity, a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state (similar to operations 306 and 406 of Figs. 3 and 4) .
[0253] The UE optionally receives 1110, from the network entity, a DCI indicating one or more TCI states of the TCI states activated by the second control signaling (similar to operations 310 and 410 of Figs. 3 and 4) . The DCI-indicated one or more TCI states of the TCI states activated by the second control signaling is referred to herein as “a set of TCI states. ” In some cases, in the set of TCI states, the DCI may indicate one TCI state. In some cases, if the MAC CE received 1106 has activated one TCI state (or TCI states corresponding to one TCI-codepoint for mTRP, such as shown in Fig. 2b) , the UE may apply the activated the TCI state directly without needing to receive 1110 the DCI.
[0254] The UE communicates 1114 with the network entity based on the one or more TCI states at an action time associated with the first delay or the second delay (similar to operations 314 and 414 of Figs. 3 and 4) .
[0255] In aspects, the first control signaling indicates a parameter for enabling activation or indication of the at least one beam-prediction TCI state.
[0256] In aspects, the at least one beam-prediction TCI state includes a first list of TCI states for TCI activation or indication with beam prediction corresponding to the first delay for a beam prediction window. The at least one non-beam-prediction TCI state includes a second list of TCI states for TCI activation or indication without beam prediction for the second delay.
[0257] In aspects, the at least one beam-prediction TCI state is same as the at least one non-beam-prediction TCI state.
[0258] In aspects, the second control signaling includes a medium access control (MAC) control element (CE) . In some cases, the MAC CE indicates whether each or all of the one or more activated TCI states are used for beam prediction, and whether the one or more activated TCI states corresponding to a transmission reception point (TRP) is for beam prediction. The UE may identify whether the MAC CE is for beam prediction based on a logical channel identifier (LCID) or an extended LCID for the MAC CE.
[0259] In aspects, the UE receives, from the network entity, the one or more activated TCI states for one or more beam predictions in the MAC CE.
[0260] In aspects, the UE receives a downlink control information (DCI) indicating a set of TCI states of the one or more TCI states activated by the second control signaling. In some cases, the DCI indicates whether the set of TCI states are used for beam prediction via at least one of: a location of physical downlink control channel (PDCCH) with the DCI; or a format of the DCI.
[0261] In some cases, the UE receives, from the network entity, a number of indicated TCI states for one or more beam prediction windows. The UE identifies the action time for applying the set of TCI states based on at least one of: a predefined slot; a predefined time after a first last symbol of the PDCCH with the DCI; or a slot configured by the network entity.
[0262] In aspects, the first control signaling further indicates, for each beam-prediction TCI state, at least one of: a first downlink reference signal (DL RS) associated with quasi-co-location type D (QCL-typeD) for spatial reception parameter indication; a second DL RS associated with a pathloss reference signal (PL-RS) ; or a third DL RS associated with QCL-type A for average delay, delay spread, Doppler shift and Doppler spread indication.
[0263] In some cases, the UE monitors for the first DL RS, the second DL RS, and the third DL RS after receiving the second control signaling or after transmitting an acknowledgement (ACK) for the second control signaling. The UE refrains from monitoring for the first DL RS, the second DL RS, or the third DL RS after switching to another activated TCI state.
[0264] In some cases, the UE receives, for the one or more TCI states, at least one of: a first set of aperiodic DL RS resources quasi-co-located (QCLed) with the first DL RS associated with the QCL-typeD indication; a second set of aperiodic DL RS resources QCLed with the second DL RS associated with the PL-RS; or a third set of DL RS resources QCLed with the third DL RS associated with the QCL-typeA indication.
[0265] In aspects, the UE determines the first delay and the second delay based on at least one of: a delay from receiving the second control signaling to transmitting the acknowledgement (ACK) for the second control signaling; a delay for quasi-co-location (QCL) parameter tracking; a delay for UE beam tracking based on whether an associated TCI state is known or unknown; a delay for pathloss measurement based on whether the UE maintains a pathloss operation; or the beam prediction window.
[0266] Fig. 12 is a flowchart of a method 1200 of wireless communication at a network entity. The method 1200 is complementary to the method 1100 of Fig. 11. With reference to Figs. 1, 3, 4, and 14, the method 1200 may be performed by one or more network entities 104, which may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, the CU 110, an RU processor 1406, a DU processor 1426, a CU processor 1446, etc. The one or more network entities 104 may include memory 1406’ / 1426’ / 1446’, which may correspond to an entirety of the one or more network entities 104, or a component of the one or more network entities 104, such as the RU processor 1406, the DU processor 1426, or the CU processor 1446.
[0267] As shown in Fig. 12, the network entity receives 1202, from a UE, an indication of capability on supported TCI activation or indication configuration based on beam prediction (similar to operations 302 and 502 of Figs. 3 and 5) .
[0268] The network entity transmits 1204, to the UE, a first control signaling indicating: at least one beam-prediction transmission configuration indicator (TCI) state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay (similar to operations 304 and 504 of Figs. 3 and 5) .
[0269] The network entity transmits 1206, to the UE, a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state (similar to operations 306 and 406 of Figs. 3 and 4) .
[0270] The network entity optionally transmits 1210, to the UE, a DCI indicating one or more TCI states of the TCI states activated by the second control signaling (similar to operations 310 and 510 of Figs. 3 and 5) .
[0271] The network entity communicates 1214 with the network entity based on the one or more TCI states at an action time associated with the first delay or the second delay (similar to operations 314 and 514 of Figs. 3 and 5) .
[0272] In aspects, the at least one beam-prediction TCI state includes a first list of TCI states for TCI activation or indication with beam prediction corresponding to the first delay for a beam prediction window. The at least one non-beam-prediction TCI state includes a second list of TCI states for TCI activation or indication without beam prediction for the second delay. In some cases, the network entity transmits, to the UE for each beam-prediction TCI state, at least one of: a first downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type D for spatial reception parameter indication in the beam-prediction TCI state; a second DL RS associated with or configured as pathloss reference signal (PL-RS) for the beam-prediction TCI state; or a third DL RS associated with or configured as DL RS for QCL type A for average delay, delay spread, Doppler shift and Doppler spread indication in the beam-prediction TCI state.
[0273] A UE apparatus 1302, as described in Fig. 13, may perform the method 1100. The one or more network entities (or BS) 104, as described in Fig. 14, may perform the method 1200.
[0274] Fig. 13 is a diagram 1300 illustrating an example of a hardware implementation for a UE apparatus 1302. The UE apparatus 1302 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE apparatus 1302 may include an application processor 1306, which may have on-chip memory 1306’. In examples, the application processor 1306 may be coupled to a secure digital (SD) card 1308 and / or a display 1310. The application processor 1306 may also be coupled to a sensor (s) module 1312, a power supply 1314, an additional module of memory 1316, a camera 1318, and / or other related components. For example, the sensor (s) module 1312 may control a barometric pressure sensor / altimeter, a motion sensor such as an inertial management unit (IMU) , a gyroscope, accelerometer (s) , a light detection and ranging (LIDAR) device, a radio-assisted detection and ranging (RADAR) device, a sound navigation and ranging (SONAR) device, a magnetometer, an audio device, and / or other technologies used for positioning.
[0275] The UE apparatus 1302 may further include a wireless baseband processor 1326, which may be referred to as a modem. The wireless baseband processor 1326 may have on-chip memory 1326'. Along with, and similar to, the application processor 1306, the wireless baseband processor 1326 may also be coupled to the sensor (s) module 1312, the power supply 1314, the additional module of memory 1316, the camera 1318, and / or other related components. The wireless baseband processor 1326 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 1320 and / or one or more transceivers 1330 (e.g., wireless RF transceivers) .
[0276] Within the one or more transceivers 1330, the UE apparatus 1302 may include a Bluetooth module 1332, a WLAN module 1334, an SPS module 1336 (e.g., GNSS module) , and / or a cellular module 1338. The Bluetooth module 1332, the WLAN module 1334, the SPS module 1336, and the cellular module 1338 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) . The Bluetooth module 1332, the WLAN module 1334, the SPS module 1336, and the cellular module 1338 may each include dedicated antennas and / or utilize antennas 1340 for communication with one or more other nodes. For example, the UE apparatus 1302 may communicate through the transceiver (s) 1330 via the antennas 1340 with another UE 102 (e.g., sidelink communication) and / or with a network entity 104 (e.g., uplink / downlink communication) , where the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, or the CU 110.
[0277] The wireless baseband processor 1326 and the application processor 1306 may each include a computer-readable medium / memory 1326', 1306', respectively. The additional module of memory 1316 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 1326', 1306', 1316 may be non-transitory. The wireless baseband processor 1326 and the application processor 1306 may each be responsible for general processing, including execution of software stored on the computer-readable medium / memory 1326', 1306', 1316. The software, when executed by the wireless baseband processor 1326 / application processor 1306, causes the wireless baseband processor 1326 / application processor 1306 to perform the various functions described herein. The computer-readable medium / memory may also be used for storing data that is manipulated by the wireless baseband processor 1326 / application processor 1306 when executing the software. The wireless baseband processor 1326 / application processor 1306 may be a component of the UE 102. The UE apparatus 1302 may be a processor chip (e.g., modem and / or application) and include just the wireless baseband processor 1326 and / or the application processor 1306. In other examples, the UE apparatus 1302 may be the entire UE 102 and include the additional modules of the apparatus 1302.
[0278] As discussed in Fig. 1 and implemented with respect to Figs. 3 and 4, the TSI states component 140 is configured to receive, from a network entity, a first control signaling indicating: at least one beam-prediction TCI state associated with a first delay, and at least one non-beam-prediction TCI state associated with a second delay. The TSI states component 140 then receives a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state. The UE 102 then communicates with the network entity based on the one or more TCI states at an action time associated with the first delay or the second delay.
[0279] The TSI states component 140 may be within the application processor 1306 (e.g., at 140a) , the wireless baseband processor 1326 (e.g., at 140b) , or both the application processor 1306 and the wireless baseband processor 1326. The TSI states component 140a-140b may be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors, or a combination thereof.
[0280] Fig. 14 is a diagram 1400 illustrating an example of a hardware implementation for one or more network entities 104. The one or more network entities 104 may be a base station, a component of a base station, or may implement base station functionality. The one or more network entities 104 may include, or may correspond to, at least one of the RU 106, the DU 108, or the CU 110. The CU 110 may include a CU processor 1446, which may have on-chip memory 1446'. In some aspects, the CU 110 may further include an additional module of memory 1456 and / or a communications interface 1448, both of which may be coupled to the CU processor 1446. The CU 110 may communicate with the DU 108 through a midhaul link 162, such as an F1 interface between the communications interface 1448 of the CU 110 and a communications interface 1428 of the DU 108.
[0281] The DU 108 may include a DU processor 1426, which may have on-chip memory 1426'. In some aspects, the DU 108 may further include an additional module of memory 1436 and / or the communications interface 1428, both of which may be coupled to the DU processor 1426. The DU 108 may communicate with the RU 106 through a fronthaul link 160 between the communications interface 1428 of the DU 108 and a communications interface 1408 of the RU 106.
[0282] The RU 106 may include an RU processor 1406, which may have on-chip memory 1406'. In some aspects, the RU 106 may further include an additional module of memory 1416, the communications interface 1408, and one or more transceivers 1430, all of which may be coupled to the RU processor 1406. The RU 106 may further include antennas 1440, which may be coupled to the one or more transceivers 1430, such that the RU 106 may communicate through the one or more transceivers 1430 via the antennas 1440 with the UE 102.
[0283] The on-chip memory 1406', 1426', 1446' and the additional modules of memory 1416, 1436, 1456 may each be considered a computer-readable medium / memory. Each computer-readable medium / memory may be non-transitory. Each of the processors 1406, 1426, 1446 is responsible for general processing, including execution of software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor (s) 1406, 1426, 1446 causes the processor (s) 1406, 1426, 1446 to perform the various functions described herein. The computer-readable medium / memory may also be used for storing data that is manipulated by the processor (s) 1406, 1426, 1446 when executing the software. In examples, the TSI states component 150 may sit at any of the one or more network entities 104, such as at the CU 110; both the CU 110 and the DU 108; each of the CU 110, the DU 108, and the RU 106; the DU 108; both the DU 108 and the RU 106; or the RU 106.
[0284] The TSI states component 150 may perform various operations and signaling (such as the operations in Figs. 3A, 3B, and 5) according to the examples provided herein and be within one or more processors of the one or more network entities 104, such as the RU processor 1406 (e.g., at 150a) , the DU processor 1426 (e.g., at 150b) , and / or the CU processor 1446 (e.g., at 150c) . The TSI states component 150a-150c may be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors 1406, 1426, 1446 configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors 1406, 1426, 1446, or a combination thereof.
[0285] The specific order or hierarchy of blocks in the processes and flowcharts disclosed herein are an illustration of example approaches. Hence, the specific order or hierarchy of blocks in the processes and flowcharts may be rearranged. Some blocks may also be combined or deleted. Dashed lines may indicate example / optional elements of the diagrams. The accompanying method claims present elements of the various blocks in an example order, and are not limited to the specific order or hierarchy presented in the claims, processes, and flowcharts.
[0286] The detailed description set forth herein describes various configurations in connection with the drawings and does not represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough explanation of various concepts. However, these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
[0287] Aspects of wireless communication systems, such as telecommunication systems, are presented with reference to various apparatuses and methods. These apparatuses and methods are described in the following detailed description and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, call flows, systems, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0288] An element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems-on-chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other similar hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software, which may be referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Software may be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.
[0289] If the functionality described herein is implemented in software, the functions may be stored on, or encoded as, one or more instructions or code on a computer-readable medium, such as a non-transitory computer-readable storage medium. Computer-readable media includes computer storage media and may include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that may be used to store computer executable code in the form of instructions or data structures that may be accessed by a computer. Storage media may be any available media that may be accessed by a computer.
[0290] Aspects, implementations, and / or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, the aspects, implementations, and / or use cases may come about via integrated chip implementations and other non-module-component based devices, such as end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, artificial intelligence (AI) -enabled devices, machine learning (ML) -enabled devices, etc. The aspects, implementations, and / or use cases may range from chip-level or modular components to non-modular or non-chip-level implementations, and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques described herein.
[0291] Devices incorporating the aspects and features described herein may also include additional components and features for the implementation and practice of the claimed and described aspects and features. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes, such as hardware components, antennas, RF-chains, power amplifiers, modulators, buffers, processor (s) , interleavers, adders / summers, etc. Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of varying configurations.
[0292] The description herein is provided to enable a person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects described herein, but are to be interpreted in view of the full scope of the present disclosure consistent with the language of the claims.
[0293] Reference to an element in the singular does not mean “one and only one” unless specifically stated, but rather “one or more. ” Terms such as “if, ” “when, ” and “while” do not imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when, ” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The terms “may, ” “might, ” and “may, ” as used in this disclosure, often carry certain connotations. For example, “may” refers to a permissible feature that may or may not occur, “might” refers to a feature that probably occurs, and “may” refers to a capability (e.g., capable of) . The phrase “For example” often carries a similar connotation to “may” and, therefore, “may” is sometimes excluded from sentences that include “for example” or other similar phrases.
[0294] Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C” or “one or more of A, B, or C” include any combination of A, B, and / or C, such as A and B, A and C, B and C, or A and B and C, and may include multiples of A, multiples of B, and / or multiples of C, or may include A only, B only, or C only. Sets may be interpreted as a set of elements where the elements number one or more.
[0295] Unless otherwise specifically indicated, ordinal terms such as “first” and “second” do not necessarily imply an order in time, sequence, numerical value, etc., but are used to distinguish between different instances of a term or phrase that follows each ordinal term. Reference numbers, as used in the specification and figures, are sometimes cross-referenced among drawings to denote same or similar features. A feature that is exactly the same in multiple drawings may be labeled with the same reference number in the multiple drawings. A feature that is similar among the multiple drawings, but not exactly the same, may be labeled with reference numbers that have different leading numbers, but have one or more of the same trailing numbers (e.g., 206, 306, 406, etc., may refer to similar features in the drawings) . Sometimes an “X” is used to universally denote multiple variations of a feature. For instance, “X06” may universally refer to all reference numbers that end in “06” (e.g., 206, 306, 406, etc. ) .
[0296] It is noted that throughout this disclosure, a panel may mean that an antenna (port) group or an antenna (port) set. There may be more than one DL / UL beams associated with one panel. When one transmitting node (UE or the network entity) is performing a transmission via a panel, only one beam associated with the panel may be used to perform the transmission. For a transmitter comprising more than one panels, e.g., two panels, it may happen that two beams associated with the two panels respectively are used to perform a transmission.
[0297] It is noted that throughout this disclosure, the UE may have one or more of the following attributes or behaviors. The following attributes or behaviors of the UE may also imply associated attributes or behaviors of a network entity.
[0298] The UE may be configured with and / or served by the network entity in a serving cell.
[0299] The UE may (be configured to) communicate with the network entity in the serving cell.
[0300] The UE may be configured with one or more serving cells by the network entity, which may include the serving cell.
[0301] The UE may be activated or be indicated, by the network entity, to activate one or more serving cells, which may include the serving cell.
[0302] The UE may be configured and / or indicated, by the network entity, one or more BWP. The UE may be indicated and / or configured, by the network entity, a BWP (in the serving cell) .
[0303] In some cases, the BWP may be activated as an active BWP.
[0304] In some cases, the BWP may be referred to an active BWP
[0305] In some cases, the BWP may be an active DL BWP.
[0306] In some cases, the BWP may be an active UL BWP.
[0307] In some cases, the BWP may be an initial BWP.
[0308] In some cases, the BWP may be a default BWP.
[0309] In some cases, the BWP may be a dormant BWP.
[0310] The UE may be in one of RRC_CONNECTED state, RRC_INACTIVE state or RRC_IDLE state.
[0311] It is noted that throughout this disclosure, a neighboring cell may be referred to or replaced with one or some of the following: (1) a non-serving cell, (2) a cell with PCI different that of the serving cell, or (3) a TRP associated with a PCI different from that of the serving cell.
[0312] It is noted that throughout this disclosure, when a procedure or description is related to a serving cell, it may mean the procedure or description is related to an active (DL / UL) BWP in the serving cell.
[0313] It is noted that throughout this disclosure, a CSI report for target or candidate cell may be replaced with or referred to as a CSI report for LTM.
[0314] It is noted that throughout this disclosure, a CSI report for serving cell may be replaced with or referred to as a CSI report other than CSI report for LTM” , or a Type1 / 2 CSI report.
[0315] It is noted that throughout this disclosure, a serving cell index for a CSI report may be referred to as or stand for that a serving cell index of a serving cell where the CSI report is transmitted on, or a serving cell where the CSI report is configured for, or a serving cell where report configuration of the CSI report is configured in.
[0316] It is noted that throughout this disclosure, a panel may mean that an antenna (port) group or an antenna (port) set. There may be more than one DL / UL beams associated with one panel. When one transmitting node (UE or the network entity) is performing a transmission via a panel, only one beam associated with the panel may be used to perform the transmission. For a transmitter comprising more than one panels, e.g., two panels, it may happen that two beams associated with the two panels respectively are used to perform a transmission.
[0317] It is noted that throughout this disclosure, a TRP identifier may mean or be referred to a (candidate) value of a TRP identifier. The first TRP identifier may be a first candidate value of a TRP identifier or a first TRP identifier value. The second TRP identifier may be a second candidate value of a TRP identifier or a second TRP identifier value.
[0318] It is noted that throughout this disclosure, a panel identifier may mean or be referred to a (candidate) value of a panel identifier. The first panel identifier may be a first candidate value of a panel identifier or a first panel identifier value. The second panel identifier may be a second candidate value of a panel identifier or a second panel identifier value.
[0319] It is noted that throughout this disclosure, when a procedure or description is related to a serving cell, it may mean the procedure or description is related to an active (DL / UL) BWP in the serving cell.
[0320] It is noted that throughout this disclosure, an expression of “X / Y” may include meaning of “X or Y” . It is noted that throughout this disclosure, an expression of “X / Y” may include meaning of “X and Y” . It is noted that throughout this disclosure, an expression of “X / Y” may include meaning of “X and / or Y” . It is noted that throughout this disclosure, an expression of “ (A) B” or “B (A) ” may include concept of “only B” . It is noted that throughout this disclosure, an expression of “ (A) B” or “B (A) ” may include concept of “A+B” or “B+A” .
[0321] It is noted that some or all of the foregoing or the following embodiments may be jointly combined or formed to be a new or another one embodiment.
[0322] It is noted that the foregoing or the following embodiments may be used to solve at least (but not limited to) the issue (s) or scenario (s) mentioned in this disclosure.
[0323] The following additional considerations may apply to the foregoing and the following discussions.
[0324] It is noted that any two or more than two of the foregoing or the following paragraphs, (sub) -bullets, points, actions, or claims described in each method / embodiment / implementation may be combined logically, reasonably, and properly to form a specific method.
[0325] It is noted that any sentence, paragraph, (sub) -bullet, point, action, or claim described in each of the foregoing or the following embodiment (s) / implementations / concept (s) may be implemented independently and separately to form a specific method. Dependency, e.g., “based on, ” “more specifically, ” “where” or etc., in embodiment (s) / implementations / concept (s) mentioned in this disclosure is just one possible embodiment which would not restrict the specific method.
[0326] It is noted that, some or all of the following terminology and assumption may be used hereafter. A BS may include a network central unit or a network node in NR which is used to control one or multiple TRPs which are associated with one or multiple cells. Communication between BS and TRP (s) is via fronthaul. BS may be referred to as central unit (CU) , eNB, gNB, or NodeB. A TRP may include a transmission and reception point provides network coverage and directly communicates with UEs. TRP may be referred to as distributed unit (DU) or network node. A cell may include one or multiple associated TRPs, e.g., coverage of the cell is composed of coverage of all associated TRP (s) . One cell is controlled by one BS or a network entity. Cell may be referred to as TRP group (TRPG) . A serving beam may include a beam generated by a network node, e.g., TRP, which is configured to be used to communicate with the UE, such as, for transmission and / or reception. A candidate beam for a UE is a candidate of a serving beam. Serving beam may or may not be candidate beam.
[0327] A user device in which the techniques of this disclosure may be implemented (e.g., the UE 102) may be any suitable device capable of wireless communications such as a smartphone, a tablet computer, a laptop computer, a mobile gaming console, a point-of-sale (POS) terminal, a health monitoring device, a drone, a camera, a media-streaming dongle or another personal media device, a wearable device such as a smartwatch, a wireless hotspot, a femtocell, or a broadband router. Further, the user device in some cases may be embedded in an electronic system such as the head unit of a vehicle or an advanced driver assistance system (ADAS) . Still further, the user device may operate as an internet-of-things (IoT) device or a mobile-internet device (MID) . Depending on the type, the user device may include one or more general-purpose processors, a computer-readable memory, a user interface, one or more network interfaces, one or more sensors, etc.
[0328] Certain embodiments are described in this disclosure as including logic or a number of components or modules. Modules may be software modules (e.g., code stored on non-transitory machine-readable medium) or hardware modules. A hardware module is a tangible unit capable of performing certain operations and may be configured or arranged in a certain manner. A hardware module may comprise dedicated circuitry or logic that is permanently configured (e.g., as a special-purpose processor, such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC) ) to perform certain operations. A hardware module may also comprise programmable logic or circuitry (e.g., as encompassed within a general-purpose processor or other programmable processor) that is temporarily configured by software to perform certain operations. The decision to implement a hardware module in dedicated and permanently configured circuitry, or in temporarily configured circuitry (e.g., configured by software) may be driven by cost and time considerations.
[0329] When implemented in software, the techniques may be provided as part of the operating system, a library used by multiple applications, a particular software application, etc. The software may be executed by one or more general-purpose processors or one or more special-purpose processors.
[0330] Structural and functional equivalents to elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are encompassed by the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ” As used herein, the phrase “based on” may not be construed as a reference to a closed set of information, one or more conditions, one or more factors, or the like. In other words, the phrase “based on A, ” where “A” may be information, a condition, a factor, or the like, may be construed as “based at least on A” unless specifically recited differently.
[0331] Example Aspects
[0332] Example 1 is an apparatus, comprising a processer configured to cause a User Equipment (UE) to:
[0333] receive a radio resource control (RRC) signaling configuring at least one of the followings:
[0334] a first list of transmission configuration indicator (TCI) states for TCI activation or indication without beam prediction corresponding to a first action delay;
[0335] a second list of TCI states for TCI activation or indication with beam prediction corresponding to a second action delay for a beam prediction window; or
[0336] a parameter enabling TCI activation or indication with beam prediction;
[0337] receive a physical downlink shared channel (PDSCH) with medium access control (MAC) control element (CE) activating at least one TCI state (s) from one of the configured TCI state lists;
[0338] communicate with a base station based on activated TCI state (s) at an action time based on the first or second action delay corresponding to the activated TCI state (s) .
[0339] Example 2 is an apparatus according to example 1, wherein the UE transmits the UE capability indicating at least one of the followings:
[0340] whether the UE supports TCI activation or indication based on beam prediction;
[0341] the maximum number of configured TCI states for beam prediction;
[0342] the maximum number of activated TCI states for beam prediction in one beam prediction window;
[0343] the maximum number of activated TCI states across beam prediction windows;
[0344] the maximum number of beam prediction windows.
[0345] Example 3 is an apparatus according to example 1, wherein the UE receives the configuration of the same TCI states in the first and second TCI state list.
[0346] Example 4 is an apparatus according to example 1, wherein the UE receives the configuration of different TCI states in the first and second TCI state list.
[0347] Example 5 is an apparatus according to examples 1-4, wherein the UE receives the MAC CE indicating whether all the activated TCI state (s) in the MAC CE is for beam prediction.
[0348] Example 6 is an apparatus according to examples 1-4, wherein the UE receives the MAC CE indicating whether all the activated TCI state (s) corresponding to a transmission reception point (TRP) in the MAC CE is for beam prediction.
[0349] Example 7 is an apparatus according to examples 1-4, wherein the UE receives the MAC CE indicating whether each of the activated TCI state (s) in the MAC CE is for beam prediction.
[0350] Example 8 is an apparatus according to examples 1-4, wherein the UE determines whether a MAC CE is for beam prediction or not based on the logical channel identifier (LCID) or extended LCID for the MAC CE.
[0351] Example 9 is an apparatus according to examples 5-8, wherein the UE receives the activated TCI state (s) for one beam prediction window in a MAC CE.
[0352] Example 10 is an apparatus according to examples 5-8, wherein the UE receives the activated TCI state (s) for multiple beam prediction windows in a MAC CE.
[0353] Example 11 is an apparatus according to examples 1-10, wherein the UE receives a downlink control information (DCI) indicating at least one of the activated TCI state (s) .
[0354] Example 12 is an apparatus according to example 11, wherein the UE receives an indication from the DCI indicating whether the indicated TCI state (s) is for beam prediction.
[0355] Example 13 is an apparatus according to example 11, wherein the UE determines whether the indicated TCI state (s) in the DCI is for beam prediction or not based on the location of the physical downlink control channel (PDCCH) with the DCI.
[0356] Example 14 is an apparatus according to example 11, wherein the UE determines whether the indicated TCI state (s) in the DCI is for beam prediction or not based on the DCI format.
[0357] Example 15 is an apparatus according to example 11-14, wherein the UE receives the indicated TCI state for one beam prediction window.
[0358] Example 16 is an apparatus according to example 11-14, wherein the UE receives the indicated TCI state for multiple beam prediction windows.
[0359] Example 17 is an apparatus according to example 11, wherein the UE determines the DCI indicates the TCI state (s) from the activated TCI state at one of the following time:
[0360] the first slot to apply the indicated TCI state (s) ;
[0361] the first or last symbol of the PDCCH with the DCI; or
[0362] a slot configured by the network entity.
[0363] Example 18 is an apparatus according to example 1, wherein the UE receives at least one of the following configurations for each TCI state for beam prediction:
[0364] a first downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type D for spatial reception parameter indication in the TCI state;
[0365] a second downlink reference signal (DL RS) associated with or configured as pathloss reference signal (PL-RS) for the TCI state;
[0366] a third downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type A for average delay, delay spread, Doppler shift and Doppler spread indication in the TCI state.
[0367] Example 19 is an apparatus according to example 18, wherein the first, second, and / or third DL RS are periodic DL RS.
[0368] Example 20 is an apparatus according to example 18, wherein the first, second, and / or third DL RS are semi-persistent DL RS.
[0369] Example 21 is an apparatus according to example 20, wherein the UE determines the first, second, and / or third DL RS are activated after receiving the TCI activation signaling or after transmitting the ACK for the TCI activation signaling.
[0370] Example 22 is an apparatus according to example 20, wherein the UE determines the first, second, and / or third DL RS are deactivated after switching to another activated the TCI state (s) .
[0371] Example 23 is an apparatus according to example 18, wherein the UE receives at least one of the following configurations for the TCI state.
[0372] a first set of aperiodic DL RS resources QCLed with the DL RS for QCL-typeD indication in the TCI state;
[0373] a second set of aperiodic DL RS resources QCLed with the DL RS configured as PL-RS for the TCI state;
[0374] a third set of DL RS resources QCLed with the DL RS for QCL-typeA indication in the TCI state.
[0375] Example 24 is an apparatus according to example 1, wherein the UE determines the first and second action delay based on at least one of the following factors:
[0376] a first delay from receiving the TCI activation signaling to transmitting the acknowledgement (ACK) for the TCI activation signaling;
[0377] a second delay for quasi-co-location (QCL) parameter tracking;
[0378] a third delay for UE beam tracking;
[0379] a fourth delay for pathloss measurement; or
[0380] the beam prediction window.
[0381] Example 25 is an apparatus according to example 24, wherein the UE determines the third delay based on whether the TCI state is known or unknown.
[0382] Example 26 is an apparatus according to example 24, wherein the UE determines the fourth delay based on whether the UE has maintained the pathloss.
[0383] Example 27 is an apparatus according to example 1, wherein the UE receives configuration of a second set of target applicable channel (s) and RS (s) for the activated or indicated TCI state with and without beam prediction.
[0384] Example 28 is an apparatus according to example 27, wherein the UE applies the activated or indicated TCI state with and without beam prediction for a first set of target applicable channel (s) and RS (s) and the configured second set of target applicable channel (s) and RS (s) .
[0385] Example 29 is an apparatus according to example 28, wherein the first set of target applicable channel (s) and RS (s) are pre-defined.
[0386] Example 30 is an apparatus, comprising a processer configured to cause a Base Station (BS) to:
[0387] transmit a radio resource control (RRC) signaling configuring at least one of the followings:
[0388] a first list of transmission configuration indicator (TCI) states for TCI activation or indication without beam prediction corresponding to a first action delay;
[0389] a second list of TCI states for TCI activation or indication with beam prediction corresponding to a second action delay for a beam prediction window; or
[0390] a parameter enabling TCI activation or indication with beam prediction;
[0391] transmit a physical downlink shared channel (PDSCH) with medium access control (MAC) control element (CE) activating at least one TCI state (s) from one of the configured TCI state lists;
[0392] communicate with a user equipment (UE) based on activated TCI state (s) at an action time based on the first or second action delay corresponding to the activated TCI state (s) .
[0393] Example 31 is an apparatus according to example 30, wherein the BS receives the UE capability indicating at least one of the followings:
[0394] whether the UE supports TCI activation or indication based on beam prediction;
[0395] the maximum number of configured TCI states for beam prediction;
[0396] the maximum number of activated TCI states for beam prediction in one beam prediction window;
[0397] the maximum number of activated TCI states across beam prediction windows;
[0398] the maximum number of beam prediction windows.
[0399] Example 32 is an apparatus according to example 30, wherein the BS transmits the configuration of the same TCI states in the first and second TCI state list.
[0400] Example 33 is an apparatus according to example 30, wherein the BS transmits the configuration of different TCI states in the first and second TCI state list.
[0401] Example 34 is an apparatus according to example 30-33, wherein the BS transmits the MAC CE indicating whether all the activated TCI state (s) in the MAC CE is for beam prediction.
[0402] Example 35 is an apparatus according to example 30-33, wherein the BS transmits the MAC CE indicating whether all the activated TCI state (s) corresponding to a transmission reception point (TRP) in the MAC CE is for beam prediction.
[0403] Example 36 is an apparatus according to example 30-33, wherein the BS transmits the MAC CE indicating whether each of the activated TCI state (s) in the MAC CE is for beam prediction.
[0404] Example 37 is an apparatus according to example 30-33, wherein the BS configures whether a MAC CE is for beam prediction or not based on the logical channel identifier (LCID) for the MAC CE.
[0405] Example 38 is an apparatus according to example 34-37, wherein the BS configures the activated TCI state (s) for one beam prediction window in a MAC CE.
[0406] Example 39 is an apparatus according to example 34-37, wherein the BS configures the activated TCI state (s) for multiple beam prediction windows in a MAC CE.
[0407] Example 40 is an apparatus according to example 30-39, wherein the BS transmits a downlink control information (DCI) indicating at least one of the activated TCI state (s) .
[0408] Example 41 is an apparatus according to example 40, wherein the BS transmits an indication from the DCI indicating whether the indicated TCI state (s) is for beam prediction.
[0409] Example 42 is an apparatus according to example 40, wherein the BS configures whether the indicated TCI state (s) in the DCI is for beam prediction or not based on the location of the physical downlink control channel (PDCCH) with the DCI.
[0410] Example 43 is an apparatus according to example 40, wherein the BS configures whether the indicated TCI state (s) in the DCI is for beam prediction or not based on the DCI format.
[0411] Example 44 is an apparatus according to example 40-43, wherein the BS transmits the indicated TCI state for one beam prediction window.
[0412] Example 45 is an apparatus according to example 40-43, wherein the BS transmits the indicated TCI state for multiple beam prediction windows.
[0413] Example 46 is an apparatus according to example 40, wherein the BS determines the DCI indicates the TCI state (s) from the activated TCI state at one of the following time:
[0414] the first slot to apply the indicated TCI state (s) ;
[0415] the first or last symbol of the PDCCH with the DCI; or
[0416] a slot configured by the network entity.
[0417] Example 47 is an apparatus according to example 30, wherein the BS transmits at least one of the following configurations for each TCI state for beam prediction:
[0418] a first downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type D for spatial reception parameter indication in the TCI state;
[0419] a second downlink reference signal (DL RS) associated with or configured as pathloss reference signal (PL-RS) for the TCI state;
[0420] a third downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type A for average delay, delay spread, Doppler shift and Doppler spread indication in the TCI state.
[0421] Example 48 is an apparatus according to example 47, wherein the first, second, and / or third DL RS are periodic DL RS.
[0422] Example 49 is an apparatus according to example 47, wherein the first, second, and / or third DL RS are semi-persistent DL RS.
[0423] Example 50 is an apparatus according to example 49, wherein the BS determines the first, second, and / or third DL RS are activated after receiving the TCI activation signaling or after transmitting the ACK for the TCI activation signaling.
[0424] Example 51 is an apparatus according to example 49, wherein the BS determines the first, second, and / or third DL RS are deactivated after switching to another activated the TCI state (s) .
[0425] Example 52 is an apparatus according to example 47, wherein the BS transmits at least one of the following configurations for the TCI state.
[0426] a first set of aperiodic DL RS resources QCLed with the DL RS for QCL-typeD indication in the TCI state;
[0427] a second set of aperiodic DL RS resources QCLed with the DL RS configured as PL-RS for the TCI state;
[0428] a third set of DL RS resources QCLed with the DL RS for QCL-typeA indication in the TCI state.
[0429] Example 53 is an apparatus according to example 30, wherein the BS determines the first and second action delay based on at least one of the following factors:
[0430] a first delay from receiving the TCI activation signaling to transmitting the acknowledgement (ACK) for the TCI activation signaling;
[0431] a second delay for quasi-co-location (QCL) parameter tracking;
[0432] a third delay for UE beam tracking;
[0433] a fourth delay for pathloss measurement;
[0434] the beam prediction window.
[0435] Example 54 is an apparatus according to example 53, wherein the BS determines the third delay based on whether the TCI state is known or unknown.
[0436] Example 55 is an apparatus according to example 53, wherein the BS determines the fourth delay based on whether the UE has maintained the pathloss.
[0437] Example 56 is an apparatus according to example 30, wherein the BS transmits configuration of a second set of target applicable channel (s) and RS (s) for the activated or indicated TCI state with and without beam prediction.
[0438] Example 57 is an apparatus according to example 56, wherein the BS applies the activated or indicated TCI state with and without beam prediction for a first set of target applicable channel (s) and RS (s) and the configured second set of target applicable channel (s) and RS (s) .
[0439] Example 58 is an apparatus according to example 57, wherein the first set of target applicable channel (s) and RS (s) are pre-defined.
Claims
1.A method for wireless communications by a user equipment (UE) , the method comprising:receiving (304) , from a network entity, a first control signaling indicating:at least one beam-prediction transmission configuration indicator (TCI) state associated with a first delay, andat least one non-beam-prediction TCI state associated with a second delay;receiving (306) a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state; andcommunicating (314) with the network entity based on the one or more TCI states at an action time associated with the first delay or the second delay.2.The method of claim 1, wherein the first control signaling indicates a parameter for enabling activation or indication of the at least one beam-prediction TCI state.3.The method of claim 1 or 2, wherein the at least one beam-prediction TCI state comprises a first list of TCI states for TCI activation or indication with beam prediction corresponding to the first delay for a beam prediction window; and wherein the at least one non-beam-prediction TCI state comprises a second list of TCI states for TCI activation or indication without beam prediction for the second delay.4.The method of any one of claims 1 to 3, wherein the at least one beam-prediction TCI state is same as the at least one non-beam-prediction TCI state.5.The method of any one of claims 1 to 4, wherein the second control signaling comprises a medium access control (MAC) control element (CE) .6.The method of claim 5, wherein the MAC CE indicates:whether each or all of the one or more activated TCI states are used for beam prediction, andwhether the one or more activated TCI states corresponding to a transmission reception point (TRP) is for beam prediction.7.The method of claim 5, further comprising:identifying whether the MAC CE is for beam prediction based on a logical channel identifier (LCID) or an extended LCID for the MAC CE.8.The method of any one of claims 1 to 7, further comprising:receiving (310) a downlink control information (DCI) indicating one or more TCI states of the TCI states activated by the second control signaling (referred to as “a set of TCI states” ) .9.The method of claim 8, wherein the DCI indicates whether the set of TCI states are used for beam prediction via at least one of:a location of physical downlink control channel (PDCCH) with the DCI; ora format of the DCI.10.The method of any one of claims 8 to 9, further comprising identifying the action time for applying the set of TCI states based on at least one of:a predefined slot;a predefined time after a first last symbol of the PDCCH with the DCI; ora slot configured by the network entity.11.The method of any one of claims 1-10, wherein the first control signaling further indicates, for each beam-prediction TCI state, at least one of:a first downlink reference signal (DL RS) associated with quasi-co-location type D (QCL-typeD) for spatial reception parameter indication;a second DL RS associated with a pathloss reference signal (PL-RS) ; ora third DL RS associated with QCL-type A for average delay, delay spread, Doppler shift and Doppler spread indication.12.The method of claim 11, further comprising:monitoring for the first DL RS, the second DL RS, and the third DL RS after receiving the second control signaling or after transmitting an acknowledgement (ACK) for the second control signaling; andrefraining from monitoring for the first DL RS, the second DL RS, or the third DL RS after switching to another activated TCI state.13.The method of claim 12, further comprising receiving, for the one or more TCI states, at least one of:a first set of aperiodic DL RS resources quasi-co-located (QCLed) with the first DL RS associated with the QCL-typeD indication;a second set of aperiodic DL RS resources QCLed with the second DL RS associated with the PL-RS; ora third set of DL RS resources QCLed with the third DL RS associated with the QCL-typeA indication.14.The method of any one of claims 2 to 13, further comprising determining the first delay and the second delay based on at least one of:a delay from receiving the second control signaling to transmitting the acknowledgement (ACK) for the second control signaling;a delay for quasi-co-location (QCL) parameter tracking;a delay for UE beam tracking based on whether an associated TCI state is known or unknown;a delay for pathloss measurement based on whether the UE maintains a pathloss operation; orthe beam prediction window.15.The method of any one of claims 1 to 14, further comprising:transmitting (302) , to the network entity, an indication of capability on supported TCI activation or indication configuration based on beam prediction.16.A method for wireless communications by a network entity, the method comprising:transmitting (304) , to a user equipment (UE) , a first control signaling indicating:at least one beam-prediction transmission configuration indicator (TCI) state associated with a first delay, andat least one non-beam-prediction TCI state associated with a second delay;transmitting (306) a second control signaling activating one or more TCI states among the at least one beam-prediction TCI state and the at least one non-beam-prediction TCI state; andcommunicating (314) with the UE based on the one or more TCI states at an action time associated with the first delay or the second delay.17.The method of claim 1, wherein the at least one beam-prediction TCI state comprises a first list of TCI states for TCI activation or indication with beam prediction corresponding to the first delay for a beam prediction window; and wherein the at least one non-beam-prediction TCI state comprises a second list of TCI states for TCI activation or indication without beam prediction for the second delay.18.The method of claim 16 or 17, further comprising transmitting, to the UE for each beam-prediction TCI state, at least one of:a first downlink reference signal (DL RS) associated with or configured as DL RS for quasi-co-location (QCL) type D for spatial reception parameter indication in the beam-prediction TCI state;a second DL RS associated with or configured as pathloss reference signal (PL-RS) for the beam-prediction TCI state; ora third DL RS associated with or configured as DL RS for QCL type A for average delay, delay spread, Doppler shift and Doppler spread indication in the beam-prediction TCI state.19.An apparatus comprising:one or more radio frequency (RF) modems;a processor coupled to the one or more RF modems; andat least one memory storing executable instructions, the executable instructions to manipulate at least one of the processor or the one or more RF modems to perform the method of any of claims 1 to 18.
Citation Information
Patent Citations
Transmission configuration indicator update for time domain beam prediction
WO2023206211A1
Techniques for predicting network node transmission configuration indicator states
WO2024007257A1