Method and apparatus for performing downlink and uplink beam indication in a MIMO wireless communication system
By indicating joint UL and DL TCI states without SRS resource sets or M-TRP configurations, the method addresses inefficiencies in current unified TCI frameworks, enhancing beam indication efficiency and reducing error rates in MIMO communications.
Patent Information
- Application Number
- PCT/CN2023/129655
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-03
- Publication Date
- 2025-05-08
AI Technical Summary
Current unified TCI frameworks for MIMO communications are limited to single transmission-reception point (S-TRP) scenarios, leading to inefficiencies in beam indication for PDSCH and increased error rates in decoding DCI formats, especially when M-TRP schemes are not configured.
The method involves indicating joint uplink (UL) and downlink (DL) transmission configuration indicator (TCI) states for UL and DL transmissions, respectively, without requiring an indication of sounding reference signal (SRS) resource sets or configuration for multiple transmission-reception points (M-TRP) operations, thereby enabling efficient beam indication and determination under the unified TCI framework.
This approach reduces signaling overhead and latency, improves beam indication efficiency, and decreases error rates in decoding DCI formats, even when M-TRP schemes are not enabled, by allowing the UE to communicate effectively based on indicated TCI states.
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Figure CN2023129655_08052025_PF_FP_ABST
Abstract
Description
METHOD AND APPARATUS FOR PERFORMING DOWNLINK AND UPLINK BEAM INDICATION IN A MIMO WIRELESS COMMUNICATION SYSTEMFIELD
[0001] This disclosure relates generally to wireless communications and, more particularly, to beam determination between user equipment (UE) and network for multi-input-multi-output (MIMO) communications.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] In new radio (NR) , the unified transmission configuration indicator (TCI) framework may be served as a streamlined beam indication framework, under which a user equipment (UE) may be indicated one or more unified TCI state (s) that may be applied for most of downlink (DL) and / or uplink (UL) channels and reference signals (RSs) . The unified TCI frame may reduce signaling overhead and latency of beam indication. Existing unified TCI framework considers single transmission-reception point (S-TRP) scenario only.
[0004] The unified TCI framework may be extended for multiple transmission-reception point (M-TRP) scenarios, e.g., repetitions schemes, single frequency network (SFN) or spatial division multiplexing (SDM) schemes. In addition, introduction of UL simultaneous transmission across multiple panels (STxMP) may result in other M-TRP schemes, e.g., physical uplink control channel (PUCCH) SFN, physical uplink shared channel (PUSCH) SFN, PUSCH SDM.
[0005] In M-TRP schemes, the UE transmits signals to or receives signals from multiple TRPs, improving the reliability of communication as the multiple TRPs would have a lower likelihood to blocked or impeded all at once than a single TRP. However, M-TRP transmissions may introduce interference when the signals with (e.g., to / from) different TRPs overlap in time and frequency. As such, techniques like using single frequency network (SFN) or spatial division multiplexing (SDM) may be implemented to synchronize transmissions. These techniques (and others that facilitate communication between a UE and multiple TRPs) may generally be referred to as M-TRP schemes.
[0006] Unified TCI states include multiple TCI states for use with multiple TRPs and allow the UE to select a best TRP for transmission or reception based on the TCI states of multiple TRPs. The unified TCI states may include joint TCI states, downlink TCI states, and uplink TCI states. The unified TCI states may have two modes: joint TCI mode as well as separate TCI mode. In the joint TCI mode, a joint TCI state is used to perform uplink (UL) transmission and downlink (DL) reception; while in the separate TCI mode, a DL TCI state is used to perform DL reception; and a UL TCI state is used to perform UL transmission.
[0007] As such, joint / UL and joint / DL TCI states are subset of unified TCI states. For example, joint TCI states include a combination of the TCI states of all of the TRPs (and respective DL or UL for joint / DL TCI states and joint / UL TCI states) . During operation, a network entity indicates to a UE two (or more) TCI states (e.g., a first and a second unified TCI states) for performing M-TRP schemes. The activated TCI states correspond to beams or beam configurations for the transmissions and receptions between the UE and the network entity.
[0008] In current practice, an SRS resource set indicator field is only present in DCI format 0_1 / 0_2 when two SRS resource set for codebook (CB) or non-codebook (NCB) based uplink transmissions are configured. If only one SRS resource set for the CB or NCB transmission is configured, there is no SRS resource set indicator field in DCI format 0_1 / 0_2 (see, e.g., 3GPP Technical Specification TS 38.214 v. 17.2.0, Rel. 17 Section 6.1.1.1) . In this situation, the network entity may not be able to notify the UE which indicated joint / UL TCI state (e.g., of multiple joint TCI states of the unified TCI states) may be applied for transmitting a PUSCH scheduled by DCI format 0_1 / 0_2.
[0009] Furthermore, for MIMO communications, the beam indication for PDSCH may cause inefficiency depending on if the UE has been configured for M-TRP operations. Currently, for PDSCH (e.g., scheduled by DCI format 1_1 / 1_2) , a two-bit TCI selection field in the scheduling DCI format 1_1 / 1_2 may be configured to indicate which indicated joint / DL TCI state (first or second or both) is applied for receiving scheduled PDSCH. This is for indicating both the first and second indicated joint / DL TCI states when the UE is operating in M-TRP schemes / features for PDSCH (e.g., SDM, FDM, TDM, SFN, or CJT) . However, such M-TRP schemes / features for PDSCH requires both the first and second indicated joint / DL TCI states to be applied for PDSCH. When the UE is not configured or enabled any M-TRP schemes / features for PDSCH, little benefit might result by using the two-bit TCI selection field in the signaling. When present but not utilized, the TCI selection field information might even increase the error rate of decoding a PDCCH including such DCI format.SUMMARY
[0010] The present disclosure provides methods, systems, and techniques for indicating joint uplink (UL) (joint / UL) transmission configuration indicator (TCI) states for UL transmission (e.g., physical uplink shared channel (PUSCH) ) , as well as indicating joint downlink (DL) (joint / DL) TCI states for DL transmission (e.g., physical downlink shared channel (PDSCH) ) . For example, in multi-input-multi-output (MIMO) operations, the communication between a user equipment (UE) and a network entity may benefit from using unified TCI states for beam indication or determination, e.g., to reduce signal overhead or latency. Various aspects for performing DL and UL beam indication or determination under the unified TCI framework are disclosed herein.
[0011] Some configurations or indication information may be reduced for further improvement. For example, the present disclosure provides methods and techniques on how to perform beam indication for a PUSCH when only one SRS resource set for codebook (CB) or non-codebook (NCB) is configured (and thus saving the indication for the unified TCI states) . In addition, this disclosure provides methods and techniques on how to use a TCI selection field for PDSCH in cases when the network entity does not configure the UE to operate in multi-transmission-reception-point (M-TRP) schemes / features.
[0012] According to general aspects of this disclosure, a method for wireless communications by a user equipment (UE) includes receiving, from a network entity, an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (aplurality of joint / DL / UL TCI states) . The UE receives a control resource set (CORESET) including scheduling information. The UE then communicates with the network entity based on the scheduling information and the plurality of joint / DL / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operation.
[0013] In aspects, the method further includes receiving, from the network entity, a configuration for multi-input-multi-output (MIMO) operation including a radio resource control (RRC) message configuring at least one of: (1) whether an uplink transmission is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or (2) a downlink control information (DCI) field in a DCI format related to beam selection or TCI state selection for downlink reception.
[0014] In some cases, the configuration for MIMO operation further comprises a configuration of the number of SRS resource set associated with a DCI field in DCI format 0_1 or DCI format 0_2. In some cases, the number of SRS resource set is one and the DCI field does not appear or further indicate which of the plurality of joint TCI states or plurality of UL TCI states (the plurality of joint / UL TCI states) is to be applied for the uplink transmissions to the network entity, and wherein the configuration for the MIMO operation is for a single transmission-reception-point (S-TRP) operation enabled or indicated for transmitting PUSCH transmission occasions.
[0015] In some cases, the method further includes determining a beam from the plurality of joint / UL TCI states for transmitting PUSCH transmission occasions to the network entity based on at least one of: (1) a predetermined joint / UL TCI state for uplink transmission; (2) a joint / UL TCI state configured by an RRC parameter additional to the configuration received; (3) a joint / UL TCI state instructed by a bit value of an SRS resource set indicator field in a DCI of the CORESET received; (4) a joint / UL TCI state configured by the network entity for transmitting the number of SRS resources set associated with codebook or non-codebook for DCI format 0_1 or DCI format 0_2; (5) a joint TCI state corresponding to a downlink TCI state or QCL assumption for receiving physical downlink control channel (PDCCH) occasions; or (6) a joint TCI state determined based on a starting control channel element (CCE) index of the PDCCH occasions.
[0016] In aspects, the configuration for MIMO operation further comprises a configuration of a TCI selection field associated with TCI selection in DCI format 1_1 or DCI format 1_2 for applying one of the plurality of joint TCI states or plurality of DL TCI states (the plurality of joint / DL TCI states) to receive physical downlink shared channel (PDSCH) occasions, the TCI selection field in a DCI of the CORESET received.
[0017] In some cases, the configuration for MIMO operation comprises a radio resource control (RRC) parameter indicating whether the UE is configured or enabled for the M-TRP operation.
[0018] In some cases, the RRC parameter indicates that the UE is configured and enabled for the M-TRP operation. The method may further include deriving a receiving beam based on information in the TCI selection field comprising a bit value in the DCI of the CORESET; and receiving the PDSCH occasions based on the receiving beam.
[0019] In some cases, the RRC parameter indicates that the UE is not configured or enabled for the M-TRP operation. The method may further include determining whether a TCI selection field is present in a scheduling DCI of the CORESET; upon determining that the TCI selection field is present, identifying a bit-width of the TCI selection thereof; and deriving a receiving beam.
[0020] In some cases, the method further includes deriving the receiving beam based on at least one of: (1) a joint / DL TCI state indicated by a bit value of the TCI selection field in either DCI format 1_1 or DCI format 1_2; (2) a joint / DLTCI state indicated by a one-bit field in DCI format 1_2 or indicated by a two-bit field in DCI format 1_1; (3) a joint / DLTCI state configured by an RRC parameter additional to the configuration; or (4) a predefined joint / DL TCI state.
[0021] In aspects, the M-TRP operation comprises at least one of: space domain multiplexing (SDM) PDSCH; frequency domain multiplexing (FDM) PDSCH; time domain multiplexing (TDM) PDSCH; single frequency network (SFN) PDSCH; or coherent joint transmission (CJT) PDSCH.
[0022] According to general aspects of this disclosure, a method for wireless communications by a network entity includes transmitting, to a user equipment (UE) , an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (aplurality of joint / DL / UL TCI states) . The network entity transmits, to the UE, a control resource set (CORESET) including scheduling information. The network entity then communicates with the UE based on the scheduling information and the plurality of joint / DL / UL TCI states without transmitting indication of sounding reference signal (SRS) resource set for uplink transmissions or without transmitting configuration for enabling multiple transmission-reception-point (M-TRP) operation.
[0023] In aspects, further comprising transmitting, to the UE, a configuration for multi-input-multi-output (MIMO) operation including a radio resource control (RRC) message configuring at least one of: (1) whether an uplink transmission is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or (2) a downlink control information (DCI) field in a DCI format related to beam selection for downlink reception.
[0024] 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 processor or the one or more RF modems to perform the above methods, which are discussed in details herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Fig. 1A 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.
[0026] Fig. 1B is a block diagram of another example wireless communication system of that of Fig. 1A for implementing the techniques of this disclosure.
[0027] Fig. 1C is a block diagram of an example base station including a central unit (CU) and a distributed unit (DU) of a distributed base station that may operate in the system of Fig. 1B.
[0028] Fig. 2A is a block diagram of an example protocol stack according to which the UE of Figs. 1A-B may communicate with base stations.
[0029] Fig. 2B is a block diagram of an example protocol stack according to which the UE of Figs. 1A-B may communicate with a DU and a CU of a base station.
[0030] Fig. 3 illustrates an example diagram of determining joint uplink (UL) joint / UL transmission configuration indicator (TCI) states to be applied for uplink transmissions, in accordance with aspects of this disclosure.
[0031] Fig. 4 illustrates an example flowchart of a UE determining joint / UL TCI states, in accordance with aspects of this disclosure.
[0032] Fig. 5 illustrates an example flowchart of a network entity determining joint / UL TCI states, in accordance with aspects of this disclosure.
[0033] Fig. 6 illustrates an example diagram of determining joint downlink (DL) joint / DL transmission configuration indicator (TCI) states to be applied for uplink transmissions, in accordance with aspects of this disclosure.
[0034] Fig. 7 illustrates an example flowchart of a UE determining joint / DL TCI states, in accordance with aspects of this disclosure.
[0035] Fig. 8 illustrates an example flowchart of a network entity determining joint / DL TCI states, in accordance with aspects of this disclosure.
[0036] FIG. 9 illustrates an example flowchart of a UE determining joint / UL TCI states, in accordance with aspects of this disclosure.
[0037] FIG. 10 illustrates an example flowchart of a UE determining joint / DL TCI states, in accordance with aspects of this disclosure.
[0038] Fig. 11 illustrates an example flowchart of a method performed by a UE, in accordance with aspects of this disclosure.
[0039] Fig. 12 illustrates an example flowchart of a method performed by a network entity, in accordance with aspects of this disclosure.
[0040] Fig. 13 is a diagram illustrating a hardware implementation for an example UE apparatus.
[0041] Fig. 14 is a diagram illustrating a hardware implementation for one or more example network entities.
[0042] Like numerals indicate like elements.DETAILED DESCRIPTION
[0043] The present disclosure provides methods, systems, and techniques for indicating joint uplink (UL) (joint / UL) transmission configuration indicator (TCI) states for UL transmission (e.g., physical uplink shared channel (PUSCH) ) , as well as indicating joint downlink (DL) (joint / DL) TCI states for DL transmission (e.g., physical downlink shared channel (PDSCH) ) . For example, in multi-input-multi-output (MIMO) operations, the communication between a user equipment (UE) and a network entity may benefit from using unified TCI states for beam indication or determination, e.g., to reduce signal overhead or latency. Various aspects for performing DL and UL beam indication or determination under the unified TCI framework are disclosed herein.
[0044] Aspects of this disclosure provide methods and techniques on how to resolve the ambiguity of performing beam indication for a scheduled PUSCH, when the scheduled PUSCH is scheduled by a DCI format 0_1 / 0_2 without SRS resource set indicator field included. This disclosure further provides methods and techniques on how to lower the error rate of decoding a DCI format 1_1 / 1_2 with TCI selection field (e.g., when the UE is not configured or enabled for M-TRP operations) . For example, in previous practice, when a UE is not configured or enabled for M-TRP operations, the UE may not realize which indicated joint / UL TCI state is applied for transmitting a PUSCH scheduled by a DCI format 0_1 / 0_2. In addition, the error rate of decoding a DCI format 1_1 / 1_2 with TCI selection field may be unnecessarily higher.
[0045] In M-TRP schemes, the UE transmits signals to or receives signals from multiple TRPs, improving the reliability of communication as the multiple TRPs would have a lower likelihood to blocked or impeded all at once than a single TRP. However, M-TRP transmissions may introduce interference when the signals with (e.g., to / from) different TRPs overlap in time and frequency. As such, techniques like using single frequency network (SFN) or spatial division multiplexing (SDM) may be implemented to synchronize transmissions. These techniques (and others that facilitate communication between a UE and multiple TRPs) may generally be referred to as M-TRP schemes.
[0046] Unified TCI states include multiple TCI states (e.g., multiple beams) for use with multiple TRPs and allow the UE to select a best TRP for transmission or reception based on the TCI states of multiple TRPs. The unified TCI states may include joint TCI states, downlink TCI states, and uplink TCI states. The unified TCI states may have two modes: joint TCI mode as well as separate TCI mode. In the joint TCI mode, a joint TCI state is used to perform uplink (UL) transmission and downlink (DL) reception; while in the separate TCI mode, a DL TCI state is used to perform DL reception; and a UL TCI state is used to perform UL transmission. As such, joint / UL and joint / DL TCI states are subset of unified TCI states. For example, joint TCI states include a combination of the TCI states of all of the TRPs (and respective DL or UL for joint / DL TCI states and joint / UL TCI states) . During operation, a network entity indicates to a UE two (or more) TCI states (e.g., a first and a second unified TCI states) for performing M-TRP schemes. The activated TCI states correspond to beams or beam configurations for the transmissions and receptions between the UE and the network entity.
[0047] In known practice, an SRS resource set indicator field is only present in DCI format 0_1 / 0_2 when two SRS resource set for codebook (CB) or non-codebook (NCB) based uplink transmissions are configured. If only one SRS resource set for the CB or NCB transmission is configured, there is no SRS resource set indicator field in DCI format 0_1 / 0_2 (see, e.g., 3GPP Technical Specification TS 38.214 v. 17.2.0, Rel. 17 Section 6.1.1.1) . In this situation, the network entity may not be able to notify the UE which indicated joint / UL TCI state (e.g., of multiple joint TCI states of the unified TCI states) may be applied for transmitting a PUSCH scheduled by DCI format 0_1 / 0_2.
[0048] In existing techniques for MIMO communications, for PDSCH (e.g., scheduled by DCI format 1_1 / 1_2) , a two-bit TCI selection field in the scheduling DCI format 1_1 / 1_2 may be configured to indicate which indicated joint / DL TCI state (first or second or both) is applied for receiving scheduled PDSCH. This is for indicating both the first and second indicated joint / DL TCI states when the UE is operating in M-TRP schemes / features for PDSCH (e.g., SDM, FDM, TDM, SFN, or CJT) . However, such M-TRP schemes / features for PDSCH requires both the first and second indicated joint / DL TCI states to be applied for PDSCH. When the UE is not configured or enabled any M-TRP schemes / features for PDSCH, little benefit might result by using the two-bit TCI selection field in the signaling. When present but not utilized, the TCI selection field information might even increase the error rate of decoding a PDCCH including such DCI format.
[0049] As discussed below, this disclosure provides various examples to resolve the problems discussed above, and provides for how to perform beam indication for a PUSCH scheduled by DCI format 0_1 / 0_2 when there is no SRS resource indicator field present in scheduling DCI. The various examples also disclose how to design or utilize a TCI selection field when there is no M-TRP schemes / features for PDSCH configured or enabled. For example, aspects of this disclosure include a wireless communication method by a UE. The example method includes receiving, from a network entity, an indication of a plurality of joint TCI states, a plurality DL TCI states, or a plurality of UL TCI states (aplurality of joint / DL / UL TCI states) ; receiving a control resource set (CORESET) including scheduling information; and communicating with the network entity based on the scheduling information and the plurality of joint / DL / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operation.
[0050] Additionally, the present disclosure provides methods of power control, including how to determine the uplink transmission power after a cell-specific BFR has completed or after a per-TRP BFR has completed. It is also noted that the ideas, concepts or embodiments throughout the document may be applied for issue (s) or procedure (s) with similar consideration (s) or regard (s) in LTE / NR / 6G or other radio access technologies (RATs) .
[0051] Fig. 1A 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) .
[0052] 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.
[0053] 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.
[0054] 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.
[0055] 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.
[0056] 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. ”
[0057] 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.
[0058] 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) .
[0059] 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.
[0060] 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.
[0061] 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.
[0062] 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.
[0063] 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.
[0064] Still referring to Fig. 1A, in certain aspects, any of the UEs 102 may include a beam determination component 140 configured to receive, from the BS 104, an indication of a plurality of joint TCI states, a plurality DL TCI states, or a plurality of UL TCI states (aplurality of joint / DL / UL TCI states) ; receive a control resource set (CORESET) including scheduling information; and communicate with the BS 104 based on the scheduling information and the plurality of joint / DL / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operation.
[0065] The BS 104 may include a beam determination component 150 configured to transmit, to the UE 102, an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (aplurality of joint / DL / UL TCI states) . The beam determination component 150 transmits, to the UE 102, a control resource set (CORESET) including scheduling information. The beam determination component 150 then communicates with the UE 102 based on the scheduling information and the plurality of joint / DL / UL TCI states without transmitting indication of sounding reference signal (SRS) resource set for uplink transmissions or without transmitting configuration for enabling multiple transmission-reception-point (M-TRP) operation.
[0066] Accordingly, Fig. 1A 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.
[0067] Referring now to Fig. 1B, another example of the wireless communication system 100 includes the UE 102, the BS 104, the BS 106, and a core network (CN) 110. The BSs 104 and 106 may operate in a RAN 105 connected to the core network (CN) 110. The CN 110 may be implemented as an evolved packet core (EPC) 111 or a fifth generation (5G) core (5GC) 160, for example. The CN 110 may also be implemented as a sixth generation (6G) core in another example.
[0068] The BS 104 may cover one or more cells (e.g., cells 124 and 125) with one or more transmit and / or receive points (TRPs) , and the base station 106 may similarly cover one or more cells (e.g., cell 126) with one or more TRPs. For example, the BS 104 operates cell 124 with TRPs 107-1 and 107-2 and operates cell 125 with TRP 107-3, and the base station 106 operates cell 126 with TRPs 108-1 and 108-2. The cells 124 and 125 are operated on the same carrier frequency / frequencies. The cell 126 may be operated on the same carrier frequency / frequencies as the cells 124 and 125. Alternatively, the cell 126 may be operated on different carrier frequency / frequencies from the cells 124 and 125. In some implementations, the BS 104 connects each of the TRPs 107-1, 107-2, and 107-3 via a fiber connection or an Ethernet connection. If the BS 104 is a gNB, the cells 124 and 125 are NR cells. If the BS 104 is an (ng-)eNB, the cells 124 and 125 are evolved universal terrestrial radio access (EUTRA) cells. Similarly, if the base station 106 is a gNB, the cell 126 is an NR cell, and if the base station 106 is an (ng-) eNB, the cell 126 is an EUTRA cell. The cells 124, 125, and 126 may be in the same Radio Access Network Notification Areas (RNA) or different RNAs. In general, the RAN 105 may include any number of base stations, and each of the base stations may cover one, two, three, or any other suitable number of cells. The UE 102 may support at least a 5G NR (or simply, “NR” ) or E-UTRA air interface to communicate with the BS 104 via the TRP 107-1, TRP 107-2, and / or TRP-3. Similarly, the UE 102 may support at least a 5G NR (or simply, “NR” ) or E-UTRA air interface to communicate with the base station 106 via the TRP 108-1 and / or TRP 108-2. Each of the BSs 104, 106 may connect to the CN 110 via an interface (e.g., S1 or NG interface) . The BSs 104 and 106 also may be interconnected via an interface (e.g., X2 or Xn interface) for interconnecting NG RAN nodes.
[0069] When a base station (e.g., the BS 104 or 106) transmits DL data via a TRP (e.g., the TRP 107-1, TRP 107-2, TRP 107-3, TRP 108-1, or TRP 108-2) , the BS 104 may generate a packet including the data transmit the packet to the TRP 107-1. For example, the packet may be a fronthaul transport protocol data unit. The TRP extracts the data from the packet and transmits the data. In some implementations, the BS 104 may include control information for time-critical control and management information directly related to the data in the packet, and the TRP may transmit the data in accordance with the control information. In some implementations, the data includes In-phase and Quadrature (IQ) data, a physical layer bit sequence, or a MAC PDU. When the TRP receives data from a UE (e.g., UE 102) , the TRP generates a packet including the data and transmit the packet to the BS 104. In some implementations, the data includes IQ data, a physical layer bit sequence, or a MAC PDU.
[0070] Among other components, the EPC 111 may include a Serving Gateway (SGW) 112, a Mobility Management Entity (MME) 114, and a Packet Data Network Gateway (PGW) 116. The SGW 112 in general is configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc., and the MME 114 is configured to manage authentication, registration, paging, and other related functions. The PGW 116 provides connectivity from the UE 102 to one or more external packet data networks, e.g., an Internet network and / or an Internet Protocol (IP) Multimedia Subsystem (IMS) network. The 5GC 160 includes a User Plane Function (UPF) 162 and an Access and Mobility Management Function (AMF) 164, and / or Session Management Function (SMF) 166. Generally, the UPF 162 is configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc., the AMF 164 is configured to manage authentication, registration, paging, and other related functions, and the SMF 166 is configured to manage PDU sessions.
[0071] As illustrated in Fig. 1B, the BS 104 supports cells 124 and 125, and the base station 106 supports a cell 126. The cells 124, 125, and 126 may partially overlap, so that the UE 102 may select, reselect, or hand over from one of the cells 124, 125, and 126 to another. To directly exchange messages or information, the BS 104 and base station 106 may support an X2 or Xn interface. In general, the CN 110 may connect to any suitable number of base stations supporting NR cells and / or EUTRA cells.
[0072] The BS 104 is equipped with processing hardware 130 that may include one or more general-purpose processors (e.g., CPUs) and a non-transitory computer-readable memory storing instructions that the one or more general-purpose processors execute. Additionally or alternatively, the processing hardware 130 may include special-purpose processing units. The processing hardware 130 may include a PHY controller 132 configured to transmit data and control signal on physical DL channels and DL reference signals with one or more user devices (e.g., UE 102) via one or more TRPs (e.g., TRP 107-1, TRP 107-2, and / or TRP 107-3) . The PHY controller 132 is also configured to receive data and control signal on physical UL channels and / or UL reference signals with the one or more user devices via the one or more TRPs (e.g., TRP 107-1, TRP 107-2, and / or TRP 107-3) . The processing hardware 130 in an example implementation includes a MAC controller 134 configured to perform a random access (RA) procedure with one or more user devices, manage UL timing advance for the one or more user devices, receive UL MAC PDUs from the one or more user devices, and transmit DL MAC PDUs to the one or more user devices. The processing hardware 130 may further include an RRC controller 136 to implement procedures and messaging at the RRC sublayer of the protocol communication stack. The base station 106 may include processing hardware 141 that is similar to processing hardware 130. In particular, components 142, 144, and 146 may be similar to the components 132, 134, and 136, respectively.
[0073] The UE 102 is equipped with processing hardware 150 that may include one or more general-purpose processors such as CPUs and non-transitory computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and / or special-purpose processing units. The PHY controller 152 is also configured to receive data and control signal on physical DL channels and / or DL reference signals with the BS 104 or 106 via one or more TRPs (e.g., TRP 107-1, TRP 107-2, TRP 107-3, TRP 108-1, and / or TRP 108-2) . The PHY controller 152 is also configured to transmit data and control signal on physical UL channels and / or UL reference signals with the BS 104 or 106 via the one or more TRPs (e.g., TRP 107-1, TRP 107-2, TRP 107-3, TRP 108-1, and / or TRP 108-2) . The processing hardware 150 in an example implementation includes a MAC controller 154 configured to perform a random access procedure with BS 104 or 106, manage UL timing advance for the one or more user devices, transmit UL MAC PDUs to the BS 104 or 106, and receive DL MAC PDUs from the BS 104 or 106. The processing hardware 150 may further include an RRC controller 156 to implement procedures and messaging at the RRC sublayer of the protocol communication stack.
[0074] Fig. 1C depicts an example distributed or disaggregated implementation of one or both of the BSs 104, 106. In this implementation, each of the BS 104 and / or 106 includes a central unit (CU) 172 and one or more distributed units (DUs) 174. The CU 172 includes processing hardware, such as one or more general-purpose processors (e.g., CPUs) and a computer-readable memory storing machine-readable instructions executable on the general-purpose processor (s) , and / or special-purpose processing units. For example, the CU 172 may include a PDCP controller (e.g., PDCP controller 134, 144) , an RRC controller (e.g., RRC controller 136, 146) , and / or an RRC inactive controller (e.g., RRC inactive controller 138, 148) . In some implementations, the CU 172 may include an RLC controller configured to manage or control one or more RLC operations or procedures. In some implementations, the CU 172 does not include an RLC controller.
[0075] Each of the DUs 174 also includes processing hardware that may include one or more general-purpose processors (e.g., CPUs) and computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and / or special-purpose processing units. For example, the processing hardware may include a MAC controller (e.g., MAC controller 132, 142) configured to manage or control one or more MAC operations or procedures (e.g., a random access procedure) , and / or an RLC controller configured to manage or control one or more RLC operations or procedures. The processing hardware may also include a physical layer controller configured to manage or control one or more physical layer operations or procedures.
[0076] In some implementations, the RAN 105 supports Integrated Access and Backhaul (IAB) functionality. In some implementations, the DU 174 operates as an (IAB) -node, and the CU 172 operates as an IAB-donor.
[0077] In some implementations, the CU 172 may include a logical node CU-CP 172A that hosts the control plane part of the PDCP protocol of the CU 172. The CU 172 may also include logical node (s) CU-UP 172B that hosts the user plane part of the PDCP protocol and / or SDAP protocol of the CU 172. The CU-CP 172A may transmit control information (e.g., RRC messages, F1 application protocol messages) , and the CU-UP 172B may transmit data packets (e.g., SDAP PDUs or IP packets) .
[0078] The CU-CP 172A may be connected to multiple CU-Ups 172B through the E1 interface. The CU-CP 172A selects the appropriate CU-UP 172B for the requested services for the UE 102. In some implementations, a single CU-UP 172B may be connected to multiple CU-CPs 172A through the E1 interface. If the CU-CP 172A and DU (s) 174 belong to a gNB, the CU-CP 172A may be connected to one or more DU 174s through an F1-C interface and / or an F1-U interface. If the CU-CP 172A and DU (s) 174 belong to an ng-eNB, the CU-CP 172A may be connected to DU (s) 174 through a W1-C interface and / or a W1-U interface. In some implementations, one DU 174 may be connected to multiple CU-Ups 172B under the control of the same CU-CP 172A. In such cases, the connectivity between a CU-UP 172B and a DU 174 is established by the CU-CP 172A using Bearer Context Management functions.
[0079] Fig. 2A illustrates, in a simplified manner, an example protocol stack 200 according to which the UE 102 may communicate with an eNB / ng-eNB or a gNB (e.g., one or both of the BSs 104, 106) .
[0080] In the example stack 200, a physical layer (PHY) 202A of EUTRA provides transport channels to the EUTRA MAC sublayer 204A, which in turn provides logical channels to the EUTRA RLC sublayer 206A. The EUTRA RLC sublayer 206A in turn provides RLC channels to a EUTRA PDCP sublayer 208 and, in some cases, to an NR PDCP sublayer 210. Similarly, the NR PHY 202B provides transport channels to the NR MAC sublayer 204B, which in turn provides logical channels to the NR RLC sublayer 206B. The NR RLC sublayer 206B in turn provides data transfer services to the NR PDCP sublayer 210. The NR PDCP sublayer 210 in turn may provide data transfer services to the SDAP sublayer 212 or an RRC sublayer (not shown in Fig. 2A) . The UE 102, in some implementations, supports both the EUTRA and the NR stack as shown in Fig. 2A, to support handover between EUTRA and NR base stations and / or to support dual connectivity (DC) over EUTRA and NR interfaces. Further, as illustrated in Fig. 2A, the UE 102 may support layering of NR PDCP 210 over EUTRA RLC 206A, and SDAP sublayer 212 over the NR PDCP sublayer 210.
[0081] The EUTRA PDCP sublayer 208 and the NR PDCP sublayer 210 receive packets (e.g., from an IP layer, layered directly or indirectly over the PDCP layer 208 or 210) that may be referred to as SDUs, and output packets (e.g., to the RLC layer 206A or 206B) that may be referred to as PDUs. Except where the difference between SDUs and PDUs is relevant, this disclosure for simplicity refers to both SDUs and PDUs as “packets. ”
[0082] On a control plane, the EUTRA PDCP sublayer 208 and the NR PDCP sublayer 210 may provide signaling radio bearers (SRBs) to the RRC sublayer (not shown in Fig. 2A) to exchange RRC messages or NAS messages, for example. On a user plane, the EUTRA PDCP sublayer 208 and the NR PDCP sublayer 210 may provide data radio bearers (DRBs) to support data exchange. Data exchanged on the NR PDCP sublayer 210 may be SDAP PDUs, IP packets, or Ethernet packets.
[0083] Thus, it is possible to functionally split the radio protocol stack, as shown by the radio protocol stack 250 in Fig. 2B. The CU at one or both of the BSs 104, 106 may hold all the control and upper layer functionalities (e.g., RRC 214, SDAP 212, NR PDCP 210) , while the lower layer operations (e.g., NR RLC 206B, NR MAC 204B, and NR PHY 202B) are delegated to the DU. To support connection to a 5GC, NR PDCP 210 provides SRBs to RRC 214, and NR PDCP 210 provides DRBs to SDAP 212 and SRBs to RRC 214.
[0084] Next, several example scenarios are discussed with reference to Figs. 3-12. In the following scenarios, the BS 104 may communicate with the UE 102 via TRP 107-1, 107-2 or 107-3. Generally, similar events in Figs. 3-12 are labeled with similar reference numbers.
[0085] Fig. 3 illustrates an example diagram 300 of determining joint uplink (UL) joint / UL transmission configuration indicator (TCI) states to be applied for uplink transmissions, in accordance with aspects of this disclosure. As shown, the UE 102 may transmit 310, to the network entity 104 (NW) , the UE capabilities about supporting unified TCI states for M-TRP operations. The network entity 104 transmits 320 radio resource control (RRC) configuration (s) to the UE, configuring: (1) one or multiple joint / UL TCI states, (2) whether CB or NCB based UL transmission is used, and / or (3) one or more SRS resource set (s) associated with CB / NCB for DCI format 0_1 or 0_2.
[0086] The network entity 104 transmits 330 a medium access control (MAC) control element (CE) that activates a number of joint / UL TCI states from the configured multiple joint / UL TCI states. The network entity 104 optionally transmits a downlink control information (DCI) indicating the first, the second, or both the first and the second joint / UL TCI state (s) from activated joint / UL TCI states. In some cases, two or more joint / UL TCI states may be activated or indicated at 330 and 340.
[0087] The network entity 104 transmits 350 a scheduling DCI with DCI format 0_1 or DCI format 0_2 on a control resource set (CORESET) to the UE 102. The UE 102 detects the scheduling DCI on the CORESET (e.g., may be carrying other information) . Upon the detection, the UE 102 (and / or the network entity 104) determines 360 whether a first DCI field (e.g., a sounding reference signal (SRS) resource indicator field) is present or available in the scheduling DCI. The UE 102 also determines 360 the bit-width of the first DCI field (if present) , and how to interpret the first DCI field, and / or which indicated joint / UL TCI state (s) or spatial transmission filter (S) is applied for transmitting the scheduled physical uplink shared channel (PUSCH) transmission occasions, based on the number of configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 or DCI format 0_2. The determination may be based on a first signaling or mechanism further described below.
[0088] The UE 102 the transmits 370 the scheduled PUSCH transmission occasions via the determined indicated joint / UL TCI states or spatial transmission filters.
[0089] Fig. 4 illustrates an example flowchart 400 of a UE (e.g., the UE 102 of FIG. 3) determining joint / UL TCI states, in accordance with aspects of this disclosure. The flowchart 400 describes operations applicable to part of the call flow diagram 300 of Fig. 3. As shown, the flowchart 400 begins by receiving 402 an RRC parameter that configures whether CB based or NCB based UL transmission is used in an active UL BWP or in a serving cell.
[0090] The UE receives 410 configurations of one or more SRS resource sets associated with CB or NCB for DCI format 0_1 or DCI format 0_2 in the active UL BWP or in the serving cell. The UE detects 450 a scheduling DCI with DCI format 0_1 or DCI format 0_2 on a CORESET.
[0091] The UE determines 460 whether a first DCI field (e.g., an SRS resource indicator field) is present in the scheduling DCI, bit-width of the first DCI field (if the first DCI field is present) , how to interpret the first DCI field, and / or which indicated joint / UL TCI state (s) or spatial transmission filter (s) is to be applied for transmitting the scheduled PUSCH transmission occasions.
[0092] The UE then transmits 470 the scheduled PUSCH transmission occasion (s) via the determined indicated joint / UL TCI state (S) or spatial transmission filter (s) .
[0093] Fig. 5 illustrates an example flowchart 500 of a network entity (e.g., the network entity 104 of Fig. 3) determining joint / UL TCI states, in accordance with aspects of this disclosure. The flowchart 500 describes operations applicable to part of the call flow diagram 300 of Fig. 3. As shown, the flowchart 500 begins by transmitting 502, to the UE, an RRC parameter that configures whether CB based or NCB based UL transmission is used in an active UL BWP or in a serving cell.
[0094] The network entity transmits 510 configurations of one or more SRS resource sets associated with CB or NCB for DCI format 0_1 or DCI format 0_2 in the active UL BWP or in the serving cell. The UE detects 450 a scheduling DCI with DCI format 0_1 or DCI format 0_2 on a CORESET.
[0095] The network entity determines 560 whether to indicate a first DCI field (e.g., an SRS source indicator field) in the scheduling DCI, the bit width of the first DCI field (when indicated) , and / or which indicated joint / UL TCI state (s) or spatial transmission filter (s) is used for deriving how to receive the scheduled PUSCH transmission occasion (s) , based on the number of configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2, and / or based on a signaling / mechanism.
[0096] The network entity then receives 570 the scheduled PUSCH transmission occasion (s) via the determined indicated joint / UL TCI state (S) or spatial transmission filter (s) .
[0097] Fig. 6 illustrates an example diagram 600 of determining joint downlink (DL) joint / DL transmission configuration indicator (TCI) states to be applied for uplink transmissions, in accordance with aspects of this disclosure. As shown, the UE 102 transmits 612, to the network entity 104, the UE capabilities for supporting unified TCI states for M-TRP operations.
[0098] The network entity 104 transmits 622 RRC configurations for configuring one or more joint / DL TCI states, and / or whether a second DCI field (e.g., a TCI selection field) is present in the DCI format 1_1 or DCI format 1_2.
[0099] The network entity 104 transmits 632 a MAC-CE activating a number of joint / DL TCI states from configured joint / DL TCI states. The network entity 104 may optionally transmit 642 DCI indicating the first, the second, or both the first and the second joint / DL TCI state (s) from activated joint / DL TCI states.
[0100] The network entity 104 transmits 652 a scheduling DCI with DCI format 1_1 or DCI format 1_2 on a CORESET.
[0101] The UE 102 and / or the network entity 104 determines 662 whether the second DCI field is present in the scheduling DCI, the bit-width of the second DCI field when present, and / or how to interpret the second DCI field when present, based on whether the RRC parameter configures the second DCI field is present, whether the UE receives any RRC parameter configuring or enabling a M-TRP PDSCH feature / scheme, and / or based on a second signaling or mechanism further described below.
[0102] The network entity 104 transmits 672 the scheduled PSDCH via indicated joint / DL TCI states instructed by the TCI selection field and / or the signaling or mechanism.
[0103] Fig. 7 illustrates an example flowchart 700 of a UE (e.g., the UE 102 of Fig. 6) determining joint / DL TCI states, in accordance with aspects of this disclosure. The flowchart 700 describes operations applicable to part of the call flow diagram 600 of Fig. 6. As shown, the flowchart 700 begins by receiving 722, by the UE, an RRC parameter configuring whether a second DCI field (e.g., a TCI selection field) is present in DCI format 1_1 or DCI format 1_2.
[0104] The UE detects 752 a scheduling DCI with DCI format 1_1 or DCI format 1_2 on a CORESET. The UE determines 762 whether the second DCI field is present in the scheduling DCI, the bit-width of the second DCI field when present, and / or how to interpret the second DCI field when present, based on whether the RRC parameter configures the second DCI field is present, whether the UE receives any RRC parameter configuring / enabling a MTRP PDSCH feature or scheme, and / or based on the second signaling or mechanism further below.
[0105] The UE then receives 772 the scheduled PDSCH via indicated joint / DL TCI states instructed by the TCI selection field and / or the signaling or mechanism.
[0106] Fig. 8 illustrates an example flowchart 800 of a network entity (e.g., the network entity 104 of Fig. 6) determining joint / DL TCI states, in accordance with aspects of this disclosure. The flowchart 800 describes operations applicable to part of the call flow diagram 600 of Fig. 6. As shown, the flowchart 800 begins by transmitting 822, to the UE, an RRC parameter configuring whether a second DCI field (e.g., a TCI selection field) is present in DCI format 1_1 or DCI format 1_2.
[0107] The network entity transmits 852 a scheduling DCI with DCI format 1_1 or DCI format 1_2 on a CORESET.
[0108] The network entity determines 862 whether to indicate the second DCI field in the scheduling DCI, the bit-width of the second DCI field when indicated, and / or how to indicate the second DCI field when indicated, based on whether the network entity configures the second DCI field is present, whether the network entity transmits any RRC parameter configuring / enabling an M-TRP PDSCH feature / scheme, and / or based on a signaling or mechanism.
[0109] The network entity then transmits 872, to the UE, the scheduled PDSCH via indicated joint / DL TCI states instructed by the TCI selection field and / or the signaling or mechanism.
[0110] FIG. 9 illustrates an example flowchart 900 of a UE determining joint / UL TCI states, in accordance with aspects of this disclosure. As shown, the UE receives 920 configuration (s) of txConfig configuring CB / NCB, and one or two SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2.
[0111] The UE detects 950 a scheduling DCI with DCI format 0_1 / 0_2 on a CORESET. The UE determines 960 whether number of the configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2 is one or two.
[0112] When the UE determines 960 that the number is one, the UE utilize 965 other signalingor mechanism (as discussed in the first embodiment of signaling or mechanism below) to derive which indicated joint / UL TCI state (s) or spatial transmission filter (s) is applied for transmitting scheduled PUSCH transmission occasion (s) . The UE then transmits 970 the scheduled PUSCH transmission occasion (s) via indicated joint / UL TCI state (s) or spatial transmission filter (s) derived above.
[0113] When the UE determines 960 that the number is two, the UE determines 973 a two-bit SRS resource set indicator field being present in the scheduling DCI. The UE then transmits 980 the scheduled PUSCH transmission occasion (s) via indicated joint / UL TCI state (s) instructed by the SRS resource set indicator field.
[0114] FIG. 10 illustrates an example flowchart 1000 of a UE determining joint / DL TCI states, in accordance with aspects of this disclosure. As shown, the UE receives 1022 configurations that configure the presence of a TCI selection field in DCI format 1_1 or DCI format 1_2.
[0115] The UE detects 1052 a scheduling DCI with DCI format 1_1 / 1_2 on a CORESET. The UE determines 1057 whether the UE receives any RRC parameter configuring / enabling an M-TRP PDSCH feature / scheme.
[0116] When the UE determines 1057 that the M-TRP PDSCH feature or scheme has been enabled, the UE determines 1082 a two-bit TCI selection (e.g., of the second DCI field) is present in the scheduling DCI. The UE then receives 1087 the scheduled PDSCH via the indicated joint / DL TCI states instructed by the two-bit TCI selection field.
[0117] When the UE determines 1057 that the M-TRP PDSCH feature or scheme has not been enabled, the UE determines or identifies1062 whether the TCI selection field is one-bit, or two-bit or absent in the scheduling DCI, based on other signaling / mechanism (e.g., the second embodiment or signaling / mechanism discussed below) . The UE then receives 1072 the scheduled PDSCH via indicated joint / DL TCI state (s) instructed by the TCI selection field and / or other signaling / mechanism.
[0118] Various examples and embodiments discussed below are applicable to the example methods or flowcharts presented in Figs. 3-10 above.
[0119] In some implementations, a TRP (e.g., TRP 107-1, TRP 107-2, TRP 107-3, TRP 108-1 and / or TRP 108-2) may be associated with or identified by a TRP identifier. In some implementations, a network entity (e.g., the base station 104 or 106) includes or configures a TRP identifier in UL configuration (s) that the network entity transmits to a UE (e.g., the UE 102) for UL transmission (s) via a TRP identified by the TRP identifier. In some implementation, the UL configuration (s) include downlink control information (DCI) transmitted on a PDCCH, and / or physical uplink shared channel (PUSCH) configuration, physical uplink control channel (PUCCH) configuration and / or sounding reference signal (SRS) configuration included in a RRC message (e.g., RRC reconfiguration message or a RRC resume message) that the network entity transmits to the UE. In some implementations, the UL transmission (s) include PUSCH transmission (s) , PUCCH transmission (s) and / or SRS transmission (s) . In some implementations, the network entity includes a TRP identifier in DL configuration (s) that the network entity transmits to the UE 102 for DL transmission (s) via a TRP identified by the TRP identifier. In one implementation, the DL configuration (s) include DCI transmitted on a PDCCH, and / or channel state information (CSI) resource configuration, physical downlink shared channel (PDSCH) configuration (s) and / or physical downlink control channel (PDCCH) configuration (s) included in a RRC message (e.g., RRC reconfiguration message or a RRC resume message) that the network entity transmits to the UE. In some implementations, the DL transmission (s) include CSI reference signal (CSI-RS) transmission (s) , synchronization signal block (SSB) transmission (s) , PDSCH transmission (s) and / or PDCCH transmission (s) .
[0120] In other implementations, the network entity does not transmit / configure a TRP identifier to the UE and uses an implicit indication to indicate a TRP to the UE. In one implementation, the implicit indication may be one of the following configuration parameters: a CORESETPoolIndex, a value (candidate) of a CORESETPoolIndex, dataScramblingIdentityPDSCH, dataScramblingIdentityPDSCH2-r16, or PUCCH-ResourceGroup-r16. In such implementations, the UE derives a TRP (identifier) from the implicit indication. In some implementations, the network entity transmits a RRC message (e.g., RRC reconfiguration message or a RRC resume message) including the configuration parameters to the UE.
[0121] In some implementations, the network entity configures or indicates the UE a first TRP identifier. In some implementations, the UE derives a first TRP identifier (value) . In some implementations, the network entity configures or indicates the UE a second TRP identifier (value) . In some implementations, the UE derives a second TRP identifier (value) . In some implementations, the first TRP identifier may be associated with the first TRP. In some implementations, the second TRP identifier may be associated with the second TRP.
[0122] In some implementations, the network entity configures that a serving cell is associated with the first TRP or the first TRP identifier (value) . In some implementations, the network entity configures a first control resource set (CORESET) associated with the serving cell or first TRP. The network entity may configure CORESETPoolIndex #0 to identify the first CORESET. In one implementation, the network entity may transmit to the UE a RRC message (e.g., a RRC setup message, a RRC reconfiguration message or a RRC resume message) configuring the first CORESET and / or including the CORESETPoolIndex #0. Thus, the UE monitors a PDCCH on the first CORESET to receive DCIs from the network entity, which implies that the UE monitors a PDCCH or receives DCIs via the first TRP from the network entity (i.e., from the first TRP) . In such a case, the UE determines that CORESETPoolIndex #0 indicates a TRP (i.e., the first TRP) of the network entity.
[0123] In one implementation, the network entity configures that the serving cell associated with the second TRP or the second TRP identifier (value) . In other implementation, the second TAG is associated with a non-serving cell, and the network entity indicates or configures the association in a RRC message. In one implementation, the network entity configures the non-serving cell associated with the second TRP or the second TRP identifier (value) . In some implementations, the network entity configures a second CORESET is associated with the serving cell, non-serving cell or second TRP. The network entity may configure CORESETPoolIndex #1 to identify the second CORESET. In one implementation, the network entity may transmit to the UE a RRC message (e.g., a RRC setup message, a RRC reconfiguration message or a RRC resume message) configuring the second CORESET and / or including the CORESETPoolIndex #1. Thus, the UE monitors a PDCCH on the second CORESET to receive DCIs from the network entity, which implies that the UE monitors a PDCCH or receives DCIs via the second TRP from the network entity (i.e., from the second TRP) . In such a case, the UE determines that CORESETPoolIndex #1 indicates a TRP (i.e., the second TRP) .
[0124] In some implementations, the network entity may configure the UE one or more TCI state lists for a component carrier (CC) of a serving cell, where the CC could be PCell or SCell. For example, the network entity may configure a joint TCI state list for a CC of a serving cell. For example, the network entity may configure a DL TCI state list and / or a UL TCI state list for a CC of a serving cell. One joint TCI state list may comprise one or more joint TCI states. One DL TCI state list may comprise one or more DL TCI states. One UL TCI state list may comprise one or more UL TCI states.
[0125] In some implementations, the network entity may configure the UE a first RRC parameter unifiedTCI-StateType. The first RRC parameter unifiedTCI-StateType may be a per-serving-cell configuration. The first RRC parameter unifiedTCI-StateType may indicate which type of TCI state list (s) for a serving cell. For example, the first RRC parameter unifiedTCI-StateType may indicate “joint” or “separate” . The first RRC parameter unifiedTCI-StateType may provide one or more the following:
[0126] - If the first RRC parameter for a CC of serving cell indicates “joint” , the network entity could explicitly or implicitly configure the UE one or more joint TCI state list (s) for the CC of serving cell or the UE ;
[0127] - If the first RRC parameter for a CC of serving cell indicates “separate” , the network entity could explicitly or implicitly configure the UE one or more DL TCI state list (s) for the CC of serving cell;
[0128] - If the first RRC parameter for a CC of serving cell indicates “separate” , the network entity could explicitly or implicitly configure the UE one or more UL TCI state list (s) for the CC of serving cell.
[0129] In some implementations, if the network entity explicitly configures the UE one or more TCI state list (s) for a CC of a serving cell, the configuration may imply that
[0130] - the network entity configures the one or more TCI state list (s) (explicitly) under RRC configuration (e.g., ServingCellConfig) for a CC of the serving cell.
[0131] In some implementations, if the network entity implicitly configures the UE one or more TCI state list (s) for a CC of serving cell, the configuration may imply at least one of the followings:
[0132] - the network entity configures the one or more TCI state list (s) under RRC configuration (e.g., ServingCellConfig) for other serving cell (s) / CCs or a reference serving cell / CC;
[0133] - the UE refers the one or more TCI state list (s) for other serving cell (s) / CCs or a reference serving cell / CC;
[0134] - the UE determines that the one or more TCI state list (s) , which is for other serving cell / CCs or a reference serving cell / CC, is also for the CC of the serving cell.
[0135] In some implementations, the network entity may transmit a first MAC-CE to the UE when or after
[0136] - the network entity configures the UE one or more TCI state list (s) for the CC of serving cell; and / or
[0137] - the UE refers or determines one or more TCI state list (s) for the CC of serving cell.
[0138] In some implementations, the first MAC-CE may activate or indicate one or more TCI states from the one or more TCI state list (s) . The one or more TCI states activated / indicated by the first MAC-CE may map to one or more TCI codepoints in a TCI field. In some cases, the UE may (directly) apply or use the one or more TCI states activated / indicated by the first MAC-CE for performing DL and / or UL transmission (subsequently) .
[0139] In some implementations, if the number of TCI states activated / indicated by the first MAC-CE is greater than one, those TCI states activated / indicated by the first MAC-CE may map to one or more TCI codepoints in a TCI field in a DCI. In some implementations, if the number of TCI states activated / indicated by the first MAC-CE is one, the UE may (directly) apply or use the TCI state activated / indicated by the first MAC-CE for performing DL and / or UL transmission (subsequently) . In some implementations,
[0140] - if the number of TCI states activated / indicated by the first MAC-CE is two, and / or
[0141] - if the two TCI states activated / indicated by the first MAC-CE are associated with different TRP identifier or applicable for different TRP,
[0142] the UE may (directly) apply or use these two TCI states activated / indicated by the first MAC-CE for performing corresponding DL and / or UL transmission (subsequently) .
[0143] In some implementations, one TCI state may be mapped to one TCI codepoint, based on the first MAC-CE. In some cases, more than one TCI states may be mapped to one TCI codepoint, based on the first MAC-CE. In some cases, the TCI codepoint may indicate one of the followings:
[0144] - one or more joint TCI states,
[0145] ○ some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier)
[0146] - one or more DL TCI states,
[0147] ○ some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier)
[0148] - one or more UL TCI states,
[0149] ○ some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier)
[0150] - one or more DL TCI states and one or more UL TCI states.
[0151] ○ some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier)
[0152] In some cases, the number of joint TCI states indicated in a TCI codepoint by the network entity may be up to 4. In some cases, the number of DL TCI states indicated in a TCI codepoint by the network entity may be up to 4. In some cases, the number of UL TCI states indicated in a TCI codepoint by the network entity may be up to 4.
[0153] For example, one of the followings may be mapped to a TCI codepoint:
[0154] - one joint TCI state associated with the first TRP (identifier) , the other one joint TCI state associated with the second TRP (identifier) ,
[0155] - one DL TCI state associated with the first TRP (identifier) , one UL TCI state associated with the second TRP (identifier) ,
[0156] - one DL TCI state associated with the first TRP (identifier) , the other one DL TCI state associated with the second TRP (identifier) ,
[0157] - one UL TCI state associated with the first TRP (identifier) , the other one UL TCI state associated with the second TRP (identifier) ,
[0158] - one DL TCI state and one UL TCI state associated with the first TRP (identifier) , one joint TCI state associated with the second TRP (identifier) ,
[0159] - one DL TCI state and one UL TCI state associated with the first TRP (identifier) , one DL TCI state associated with the second TRP (identifier) ,
[0160] - one DL TCI state and one UL TCI state associated with the first TRP (identifier) , one ULTCI state associated with the second TRP (identifier) .
[0161] In some implementations, the UE may receive a first DCI indicating one or more TCI states. The first DCI may indicate one or more TCI states by the TCI field in the first DCI. In response to receiving the first DCI, the UE may transmit, to the network entity, a first acknowledgement signal via a PUCCH or PUSCH transmission. In response to transmitting the first acknowledgement signal, the UE may apply or use the one or more TCI states activated / indicated by the first DCI for performing DL and / or UL transmission. In some cases, in response to transmitting the first acknowledgement signal, the UE may apply or use the one or more TCI states activated / indicated by the first DCI for performing DL and / or UL transmission, after a first application time period. In some cases, the UE may apply or use the one or more TCI states activated / indicated by the first DCI for performing DL and / or UL transmission, starting from a first slot.
[0162] In some cases, the first slot may be the earliest slot that is at least the first application time period after the last symbol of the PUCCH or PUSCH transmission. In some cases, the earliest slot (for determining the first slot) and / or the first application time period may be determined based on the active BWP with the smallest SCS among the active BWP (s) of the carrier / serving cell (s) applying the one or more TCI states. In some cases, the first application time period may be in unit of one of the followings: symbol, sub-slot, slot, sub-frame, frame, ms, or second. In some cases, the first application time period may be beamAppTime.
[0163] In other implementations, the UE may receive the first MAC-CE indicating one or more TCI states. For example, the first MAC-CE may indicate one TCI state. For example, the first MAC-CE may indicate more than one TCI states, each of them may be associated with different TRP or TRP identifier. For example, the first MAC-CE may indicate two TCI states, where one is associated with the first TRP (identifier) and the other is associated with the second TRP (identifier) . In such cases, the UE may not receive a DCI indicating one or more TCI states for applying for subsequent DL and / or UL transmission. In response to receiving the first MAC-CE, the UE may transmit, to the network entity, a second acknowledgement signal via a PUCCH or PUSCH transmission. In response to transmitting the second acknowledgement signal, the UE may apply or use the one or more TCI states activated / indicated by the first MAC-CE for performing DL and / or UL transmission. In some cases, in response to transmitting the second acknowledgement signal, the UE may apply or use the one or more TCI states activated / indicated by the first MAC-CE for performing DL and / or UL transmission, after a second application time period. In some cases, the UE may apply or use the one or more TCI states activated / indicated by the first MAC-CE for performing DL and / or UL transmission, starting from a second slot.
[0164] In some cases, the second slot may be the earliest slot that is at least the second application time period after the (last) slot of the PUCCH or PUSCH transmission. In some cases, the second application time period may be In some cases, μ may be the SCS configuration for the PUCCH or PUSCH transmission; may be the subcarrier spacing configuration for kmac with a value of 0 for frequency range 1, and kmac is provided by K-Mac or kmac=0 if K-Mac is not provided.
[0165] In some implementations, the network entity may transmit a DCI (e.g., the first DCI) to indicate a first joint / DL / UL TCI state and / or a second joint / DL / UL TCI state to the UE, e.g., by TCI field in the DCI. In some cases, the first joint / DL / UL TCI state and / or the second joint / DL / UL TCI state may be from the one or more TCI states activated by the first MAC-CE. In some other implementations, the network entity may transmit a MAC-CE (e.g., the first MAC-CE) to indicate a first joint / DL / UL TCI state and / or a second joint / DL / UL TCI state to the UE, that is, activation of only a first joint / DL / UL TCI state and / or a second joint / DL / UL TCI state. The first joint / DL / UL TCI state may be referred to as a first joint TCI state or a first DL TCI state or a first UL TCI state. The second joint / DL / UL TCI state may be referred to as a second joint TCI state or a second DL TCI state or a second UL TCI state. In some cases, the first joint / DL TCI state may be associated with a first TRP or a first TRP identifier. In some cases, the second joint / DL TCI state may be associated with a second TRP or a second TRP identifier.
[0166] Several aspects are present in the following embodiments, which are related to performing beam indication for a PUSCH scheduled by DCI format 0_1 / 0_2 and designing / utilizing a TCI selection field when there is no M-TRP schemes / features for PDSCH configured or enabled. For example, the embodiments below may apply to the signaling or mechanisms for the UE to determine beam configurations in operations 965 and 1062.
[0167] In some implementations, the network entity may configure the UE one or more SRS resource set (s) for DCI format 0_1 / 0_2 in the active UL BWP or in the serving cell. In some cases, the network entity may configure the UE one or more SRS resource set (s) for DCI format 0_1 / 0_2 associated with CB in the active UL BWP or in the serving cell. In some cases, the network entity may configure the UE one or more SRS resource set (s) for DCI format 0_1 / 0_2 associated with NCB in the active UL BWP or in the serving cell.
[0168] In some implementations, the network entity may configure the UE a RRC parameter txConfig to indicate whether the UE uses codebook based or non-codebook based transmission in the active UL BWP or in the serving cell. The RRC parameter txConfig may indicate CB or NCB (i.e., codebook or nonCodebook) .
[0169] In some implementations, if the RRC parameter txConfig indicates CB, and / or if the network entity configures the UE two SRS resource sets associated with CB for DCI format 0_1 / 0_2, the UE may determine that a first DCI field is present in DCI format 0_1 / 0_2 respectively. In some implementations, if the RRC parameter txConfig indicates NCB, and / or if the network entity configures the UE two SRS resource sets associated with NCB for DCI format 0_1 / 0_2, the UE may determine that a first DCI field is present in DCI format 0_1 / 0_2 respectively. In some cases, the first DCI field may be an SRS resource set indicator field.
[0170] In some implementations, the UE may receive or detect a scheduling DCI with DCI format 0_1 / 0_2 on a CORESET.
[0171] In some implementations, if the first DCI field is present in a DCI format 0_1 / 0_2, the network entity may use the first DCI field to indicate which indicated joint / UL TCI state is applied for transmitting one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2.
[0172] For example,
[0173] - If the first DCI field indicates codepoint “00” , the UE may apply the first indicated joint / UL TCI state to transmit the one or more PUSCH transmission occasion (s) ,
[0174] - If the first DCI field indicates codepoint “01” , the UE may apply the second indicated joint / UL TCI state to transmit the one or more PUSCH transmission occasion (s) ,
[0175] - If the first DCI field indicates codepoint “10” or “11” , the UE may apply the first indicated joint / UL TCI state to transmit PUSCH transmission occasion (s) associated with the first SRS resource set among the one or more PUSCH transmission occasion (s) . The UE may apply the second indicated joint / UL TCI state to transmit PUSCH transmission occasion (s) associated with the second SRS resource set among the one or more PUSCH transmission occasion (s) .
[0176] In some implementations, if the RRC parameter txConfig indicates CB, and / or if the network entity configures the UE (only) one SRS resource set associated with CB for DCI format 0_1 / 0_2, the UE may determine that the first DCI field may or may not be present in DCI format 0_1 / 0_2 respectively. In some implementations, if the RRC parameter txConfig indicates NCB, and / or if the network entity configures the UE (only) one SRS resource set associated with NCB, the UE may determine that the first DCI field may or may not be present in DCI format 0_1 / 0_2.
[0177] In some implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE may determine the first DCI field is absent in a DCI format 0_1 / 0_2 respectively. In such implementations, the UE may apply the first indicated joint / UL TCI state to transmit the one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2. In such implementations, alternatively, the UE may apply the second indicated joint / UL TCI state to transmit the one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2.
[0178] In some implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the network entity may configure the UE a second RRC parameter. The second RRC parameter may indicate whether the first or the second indicated joint / UL TCI state is applied for transmitting a PUSCH (or one or more PUSCH transmission occasion (s) ) scheduled by a DCI format 0_1 / 0_2 without the first DCI field. In such implementations, the UE may determine the first DCI field is absent in the DCI format 0_1 / 0_2. The UE may transmit the one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2 based on the second RRC parameter.
[0179] In some implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE may determine the first DCI field is present in a DCI format 0_1 / 0_2 respectively. In such implementations, the UE may determine the first DCI field comprises one bit in a DCI format 0_1 / 0_2 respectively.
[0180] In some other implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2,
[0181] - If one of the followings occurs, the UE may determine the first DCI field is present in the DCI format 0_1 / 0_2 respectively, and / or the UE may determine the first DCI field comprises one bit in a DCI format 0_1 / 0_2 respectively:
[0182] ○ The UE receives one MAC-CE activating / mapping the first and the second joint / UL TCI states to (at least) one TCI field codepoint, and / or the UE has applied the MAC-CE, or
[0183] ○ The UE receives a DCI with TCI field indicating a TCI field codepoint with the first and the second indicated joint / UL TCI states, and / or the UE has applied the TCI field codepoint indication
[0184] - Otherwise, the UE may determine the first DCI field is absent in the DCI format 0_1 / 0_2 respectively.
[0185] In cases that the UE determines the first DCI field is present in the DCI format 0_1 / 0_2 respectively, when the RRC parameter txConfig indicates CB (or NCB) , and / or when the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE determines the first DCI field is only used for indicating whether the first or the second indicated joint / UL TCI state is applied for transmitting a PUSCH (or one or more PUSCH transmission occasion (s) ) scheduled by the DCI format 0_1 / 0_2. This may imply that how UE interprets “SRS resource indicator field” and “Precoding information and number of layers field” in the DCI format 0_1 / 0_2 is independent with the first DCI field. The UE may interpret “SRS resource indicator field” and “Precoding information and number of layers field” in the DCI format 0_1 / 0_2 based on the (only) one configured SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2. The network entity may indicate either the first indicated TCI or the second indicated TCI by the first DCI field for the corresponding DCI format. In one example, the first DCI field may take / comprise 1 bit, which indicates either the first indicated TCI or the second indicated TCI. In another example, the first DCI field may still take / comprise 2 bits, and the network entity refrains from indicating the field codepoint as “10” or “11” , which indicates “both the first and second indicated joint / UL TCI states” or “reserved” .
[0186] In some implementations, the network entity may configure the presence of the first DCI field for DCI format 0_1 / 0_2 when it configures only one SRS resource set for the DCI format 0_1 / 0_2 respectively.
[0187] In some implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE may determine the first DCI field is absent in a DCI format 0_1 / 0_2 respectively. If the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the network entity may be required to perform one of the followings:
[0188] - The network entity refrains from transmitting DCI format 0_1 / 0_2 respectively to schedule one or more PUSCH transmission occasion (s) for the UE, or
[0189] ○ This may imply that the network entity only transmits DCI format 0_0 to schedule a PUSCH transmission for the UE,
[0190] - The network entity refrains from transmitting to the UE a MAC-CE which may activate / map two joint / UL TCI states to a TCI field codepoint in DCI format 0_1 / 0_2, or
[0191] - The network entity refrains from transmitting to the UE a MAC-CE activating / mapping two joint / UL TCI states to at least one TCI field codepoint in DCI format 0_1 / 0_2, or
[0192] - The network entity refrains from transmitting to the UE a DCI with TCI field indicating a TCI field codepoint with the first and the second joint / UL TCI states.
[0193] In some implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE may not expect one of the followings or may determine one of the followings as error case:
[0194] - The network entity transmits a DCI format 0_1 / 0_2 respectively to schedule one or more PUSCH transmission occasion (s) for the UE, or
[0195] - The network entity transmits to the UE a MAC-CE which may activate / map two joint / UL TCI states to a TCI field codepoint in DCI format 0_1 / 0_2, or
[0196] - The network entity transmits to the UE a MAC-CE activating / mapping two joint / UL TCI states to at least one TCI field codepoint in DCI format 0_1 / 0_2, or
[0197] - The network entity transmits to the UE a DCI with TCI field indicating a TCI field codepoint with the first and the second joint / UL TCI states.
[0198] In some implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE may determine the first DCI field is absent in a DCI format 0_1 / 0_2 respectively. In some cases, the (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2 may be configured by the network entity to follow / share / apply the indicated joint / UL TCI state. The network entity may further configure whether the (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2 follows / shares / applies the first or the second indicated joint / UL TCI state.
[0199] In some implementations,
[0200] - if the (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2 is configured by the network entity to follow / share / apply the indicated joint / UL TCI state,
[0201] ○ the UE may apply the same indicated joint / UL TCI state that the (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2 follows / shares / applies to transmit the one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2,
[0202] - otherwise,
[0203] ○ The UE may determine whether the first or the second indicated joint / UL TCI state to transmit the one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2 based on mechanisms mentioned in Embodiment 1. For example, use the first or second indicated joint / UL TCI state, or base on the second RRC parameter, or the DCI first field.
[0204] ○ Or, the network entity may refrain from performing one of events mentioned above.
[0205] In some other implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) by DCI format 0_1 / 0_2, the network entity must configure the (only) one SRS resource set associated with CB (or NCB) by DCI format 0_1 / 0_2 to follow / share / apply the indicated joint / UL TCI state. In such implementations, the UE may apply the same indicated joint / UL TCI state that the (only) one SRS resource set associated with CB (or NCB) follows / shares / applies to transmit the one or more PUSCH transmission occasion (s) scheduled by the DCI format 0_1 / 0_2.
[0206] In some other implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE determines which indicated joint / UL TCI state to be applied for the PUSCH transmission occasion (s) scheduled by DCI format 0_1 / 0_2 respectively, based on the indicated joint / DL TCI state for the CORESET with the scheduling PDCCH. In one example, if the UE applies the first indicated joint / DL TCI state for receiving the CORESET with scheduling PDCCH, the UE applies the first indicated joint / UL TCI state to transmit the scheduled PUSCH transmission occasion (s) . In one example, if the UE applies the second indicated joint / DL TCI state for receiving the CORESET with scheduling PDCCH, the UE applies the second indicated joint / UL TCI state to transmit the scheduled PUSCH transmission occasion (s) . If the CORESET with the scheduling PDCCH is configured / indicated to be applied with two indicated joint / DL TCI states, the UE may determine to use the first or the second indicated joint / UL TCI state or the indicated joint / UL TCI state with lower TCI state ID.
[0207] In some other implementations, the UE determines whether to apply the first or the second indicated joint / UL TCI state based on whether the control resource set (CORESET) with the scheduling PDCCH follows / shares / applies at least one of the first or the second indicated joint / DL TCI state. In some cases, if the CORESET with the scheduling PDCCH is configured without following / sharing / applying any indicated joint / DL TCI or both indicated joint / DL TCI states, the UE may determine to use the first or the second indicated joint / UL TCI state to transmit the PUSCH transmission occasion (s) scheduled by DCI format 0_1 / 0_2. In some other cases, if the CORESET with the scheduling PDCCH is configured without following / sharing / applying any indicated joint / DL TCI state, the UE may determine to transmit the one or more PUSCH transmission occasion (s) scheduled by DCI format 0_1 / 0_2 by spatial transmission filters derived based on the QCL assumption or spatial receiving parameters or a SSB used for receiving the CORESET with the scheduling PDCCH.
[0208] In some other implementations, if the RRC parameter txConfig indicates CB (or NCB) , and / or if the network entity configures the UE (only) one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, the UE determines whether to apply the first or second indicated joint / UL TCI state for the PUSCH scheduled by DCI format 0_1 / 0_2 based on the location of the scheduling PDCCH (or PDCCH candidates) . In one example, the UE may determine the whether to apply the first or second indicated joint / UL TCI state for the PUSCH scheduled by DCI format 0_1 / 0_2 based on the starting control channel element (CCE) index for the scheduling PDCCH (or PDCCH candidates) . The even starting CCE index may correspond to the first indicated TCI state and the odd starting CCE index may correspond to the second indicated TCI state.
[0209] In some other implementations, the NW entity must configure two SRS resource sets associated with CB (or NCB) for DCI format 0_1 / 0_2, or the NW entity refrains from configuring only one SRS resource set associated with CB (or NCB) for DCI format 0_1 / 0_2, if one of the following occurs:
[0210] - The NW entity transmits to the UE a MAC-CE which can activate / map two joint / UL TCI states to a TCI field codepoint in DCI format 0_1 / 0_2, or
[0211] - The NW entity transmits to the UE a MAC-CE activating / mapping two joint / UL TCI states to at least one TCI field codepoint in DCI format 0_1 / 0_2, or
[0212] - The NW entity transmits to the UE a DCI with TCI field indicating a TCI field codepoint with the first and the second joint / UL TCI states.
[0213] The second signaling or mechanism (e.g., for operations 662, 762, 862, and 1062) may be implemented in the embodiments below, for utilizing the TCI selection field in DCI format 1_1 / 1_2 when there is no M-TRP PDSCH schemes / features configured / enabled.
[0214] In some implementations, the network entity may configure to the UE that a second DCI field in present in a DCI format 1_1 / 1_2. The second DCI field may indicate the UE which indicated joint / DL TCI state (s) is applied for receiving PDSCH scheduled by the DCI format 1_1 / 1_2. For example, the first, the second or both the first and the second indicated joint / DL TCI states. In some cases, the second DCI field is a TCI selection field. The presence of the second DCI field may be configured by RRC parameter tci-SelectionPresentIn-DCI.
[0215] In some implementations, the network entity may configure a RRC parameter for configuring / enabling an M-TRP PDSCH scheme or feature (e.g., SDM, FDM, TDM, SFN, or CJT) . The network entity may configure different RRC parameter for configuring / enabling different M-TRP PDSCH scheme or feature (e.g., SDM, FDM, TDM, SFN, or CJT) .
[0216] In some implementations, the UE may receive or detect a scheduling DCI with DCI format 1_1 / 1_2 on a CORESET.
[0217] In some implementations, if the network entity configures the second DCI field is present in a DCI format 1_1 / 1_2,
[0218] - If the network entity does not configure any RRC parameter for configuring / enabling an M-TRP PDSCH scheme or feature, or if the NW entity only configures or enables PDSCH-CJT, but the UE only supports one joint / DL TCI state for performing PDSCH-CJT, the UE determines the second DCI field is a one-bit field in DCI format 1_1 / 1_2. In such case, the second DCI field may indicate the first or the second indicated joint / DL TCI state
[0219] - Otherwise, the UE determines the second DCI field is a two-bit field in DCI format 1_1 / 1_2. In such case, the second DCI field may indicate the first, the second or both the first and the second indicated joint / DL TCI states.
[0220] In some implementations, if the network entity configures the second DCI field is present in a DCI format 1_1 / 1_2,
[0221] - If the network entity does not configure any RRC parameter for configuring / enabling an M-TRP PDSCH scheme or feature, or if the NW entity only configures or enables PDSCH-CJT, but the UE only supports one joint / DL TCI state for performing PDSCH-CJT,
[0222] ○ The UE determines the second DCI field is a one-bit field in DCI format 1_2. In such case, the second DCI field may indicate the first or the second indicated joint / DL TCI state
[0223] ○ The UE determines the second DCI field is a two-bit field in DCI format 1_1. In such case, the second DCI field may indicate the first, the second or both the first and the second indicated joint / DL TCI states
[0224] - Otherwise, the UE determines the second DCI field is a two-bit field in DCI format 1_1 / 1_2. In such case, the second DCI field may indicate the first, the second or both the first and the second indicated joint / DL TCI states.
[0225] In some implementations, if the network entity configures the second DCI field is present in a DCI format 1_1 / 1_2, and
[0226] if the network entity does not configure any RRC parameter for configuring / enabling an M-TRP PDSCH scheme or feature, or
[0227] if the NW entity only configures or enables PDSCH-CJT, but the UE only supports one joint / DL TCI state for performing PDSCH-CJT,
[0228] - The network entity may refrain from indicating both the first and the second joint / DL TCI states via the second DCI field, and / or
[0229] - The UE may determine it is an error case if the UE receives the second DCI field indicating both the first and the second joint / DL TCI states, and / or
[0230] - The UE may not apply / use instruction indicated by the second DCI field in a DCI, if the second DCI field indicates both the first and the second joint / DL TCI states
[0231] In some implementations, if the network entity does not configure any RRC parameter for configuring / enabling an M-TRP PDSCH scheme or feature (e.g., SDM, FDM, TDM, SFN, or CJT) , or if the NW entity only configures or enables PDSCH-CJT, but the UE only supports one joint / DL TCI state for performing PDSCH-CJT, the network entity may refrain from configuring the presence of the second DCI field. In some other implementations, the network entity and UE may determine the presence of the second DCI field based on whether any of the M-TRP PDSCH scheme is configured / enabled and whether the RRC parameter to enable the presence of the second DCI field is configured. Then for PDSCH scheduled by DCI format 1_1 / 1_2, whether to apply the first or second indicated joint / DL TCI state may be predefined or configured by an additional RRC signaling.
[0232] Additional description
[0233] 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.
[0234] ● The UE may be configured with and / or served by the network entity in a serving cell.
[0235] ● The UE may (be configured to) communicate with the network entity in the serving cell.
[0236] ● The UE may be configured with one or more serving cells by the network entity, which may include the serving cell.
[0237] ● 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.
[0238] ● 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) .
[0239] ○ In some cases, the BWP may be activated as an active BWP.
[0240] ○ In some cases, the BWP may be referred to an active BWP
[0241] ○ In some cases, the BWP may be an active DL BWP.
[0242] ○ In some cases, the BWP may be an active UL BWP.
[0243] ○ In some cases, the BWP may be an initial BWP.
[0244] ○ In some cases, the BWP may be a default BWP.
[0245] ○ In some cases, the BWP may be a dormant BWP.
[0246] ● The UE may be in one of RRC_CONNECTED state, RRC_INACTIVE state or RRC_IDLE state.
[0247] 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.
[0248] It is noted that throughout this disclosure, a scheduling CORESET could mean or be referred to as a CORESET with a scheduling PDCCH. A scheduling CORESET for a PDSCH could mean or be referred to as a CORESET with a PDCCH or DCI scheduling the PDSCH.
[0249] It is noted that throughout this disclosure, action time of a TCI state or beam indication could mean the actual timing when the TCI state or beam indication is applicable or takes effect, which could be later than the timing of receiving this TCI state or beam indication.
[0250] It is noted that throughout this disclosure, for case (s) that a SRS resource set is associated with CB for DCI format 0_1, it may mean or be referred to as that the SRS resource set is configured by srs-ResourceSetToAddModList and associated with the usage of value 'codebook' . It is noted that throughout this disclosure, for case (s) that a SRS resource set is associated with NCB for DCI format 0_1, it may mean or be referred to as that the SRS resource set is configured by srs-ResourceSetToAddModList and associated with the usage of value 'nonCodeBook' .
[0251] It is noted that throughout this disclosure, for case (s) that a SRS resource set is associated with CB for DCI format 0_2, it may mean or be referred to as that the SRS resource set is configured by srs-ResourceSetToAddModListDCI-0-2 and associated with the usage of value 'codebook' . It is noted that throughout this disclosure, for case (s) that a SRS resource set is associated with NCB for DCI format 0_2, it may mean or be referred to as that the SRS resource set is configured by srs-ResourceSetToAddModListDCI-0-2 and associated with the usage of value 'nonCodeBook' .
[0252] It is noted that throughout this disclosure, for case (s) that a network entity configures or indicates the UE to operate with S-TRP mode in a serving cell or a BWP, or for case (s) that a serving cell or a BWP is operated with S-TRP mode, it may imply or be referred to be one of the followings:
[0253] - No TRP identifier or no TRP-related index is configured or indicated, by the network entity, to any channel or RS in the serving cell or BWP, and / or
[0254] - (only) One TRP identifier or TRP-related index is configured or indicated, by the network entity, to any channel or RS in the serving cell or BWP, and / or
[0255] - When the UE or the network entity transmits / receives a transmission, (only) one TRP identifier or TRP-related index is configured or indicated or involved to the transmission or the beam / TCI state applied for the transmission.
[0256] It is noted that throughout this disclosure, for case (s) that a network entity configures or indicates the UE to operate with M-TRP mode in a serving cell or a BWP, or for case (s) that a serving cell or a BWP is operated with M-TRP mode, it may imply or be referred to be one of the followings:
[0257] - More than one TRP identifier or TRP-related index is configured or indicated, by the network entity, to at least one channel or RS in the serving cell or BWP, and / or
[0258] - One TRP identifier or TRP-related index is configured or indicated, by the network entity, to one channel or RS in the serving cell or BWP; and the UE derives or determines another one TRP identifier or TRP-related index applied for or associated with at least one channel or RS in the serving cell or BWP, and / or
[0259] - When the UE or the network entity transmits / receives a transmission, more than one TRP identifier or TRP-related index is configured or indicated or involved to the transmission or the beam / TCI state applied for the transmission, and / or
[0260] - The network entity configures, to the UE, a higher layer parameter PDCCH-Config that contains two different values of coresetPoolIndex in ControlResourceSet in the serving cell or BWP, and / or
[0261] - The UE receives, from the network entity, a MAC-CE (e.g., PDSCH TCI activation MAC-CE) in the serving cell or BWP, which indicates that at least one TCI codepoint is mapped to two TCI states.
[0262] It is noted that throughout this disclosure, for case (s) that a network entity configures or indicates the UE to operate with (M-TRP) M-DCI mode in a serving cell or a BWP, or for case (s) that a serving cell or a BWP is operated with (M-TRP) M-DCI mode, it may imply or be referred to be one of the followings:
[0263] - More than one TRP identifier or TRP-related index is configured or indicated, by the network entity, to at least one channel or RS in the serving cell or BWP, and / or
[0264] - One TRP identifier or TRP-related index is configured or indicated, by the network entity, to one channel or RS in the serving cell or BWP; and the UE derives or determines another one TRP identifier or TRP-related index applied for or associated with at least one channel or RS in the serving cell or BWP, and / or
[0265] - The network entity configures, to the UE, a higher layer parameter PDCCH-Config that contains two different values of coresetPoolIndex in ControlResourceSet in the serving cell or BWP.
[0266] It is noted that throughout this disclosure, for case (s) that a network entity configures or indicates the UE to operate with (M-TRP) S-DCI mode in a serving cell or a BWP, or for case (s) that a serving cell or a BWP is operated with (M-TRP) S-DCI mode, it may imply or be referred to be one of the followings:
[0267] - When the UE or the network entity transmits / receives a transmission, more than one TRP identifier or TRP-related index is configured or indicated or involved to the transmission or the beam / TCI state applied for the transmission, and / or
[0268] - The UE receives, from the network entity, a MAC-CE (e.g., PDSCH TCI activation MAC-CE) in the serving cell or BWP, which indicates that at least one TCI codepoint is mapped to two TCI states, each of which is associated with different TRP or different TRP identifier (value) .
[0269] ○ For example, at least one TCI codepoint is mapped to two joint TCI states, each of which is associated with different TRP or different TRP identifier (value) . For another example, at least one TCI codepoint is mapped to two DL TCI states or two UL TCI states, each of which is associated with different TRP or different TRP identifier (value) . For another example, at least one TCI codepoint is mapped to a DL TCI state and a pair of DL TCI state and UL TCI state, where the DL TCI state and the pair is associated with different TRP or different TRP identifier (value) .
[0270] It is noted that throughout this disclosure, a TRP identifier could mean or be referred to a (candidate) value of a TRP identifier. The first TRP identifier could be a first candidate value of a TRP identifier or a first TRP identifier value. The second TRP identifier could be a second candidate value of a TRP identifier or a second TRP identifier value.
[0271] Fig. 11 illustrates a flowchart of a method 1100 of wireless communication at a UE. With reference to Figs. 1A, 1B, 3-10, 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 post-BFR update component 1110) of the UE 102 or the UE apparatus 1302, such as the wireless baseband processor 1326 and / or the application processor 1306.
[0272] As shown in Fig. 11, the method 1100 starts by optionally receiving 1120, from a network entity, a configuration for MIMO operation (similar to respective operations 320, 622, 920, and 1022 of Figs. 3, 6, 9, and 10) .
[0273] The UE receives 1130, from the network entity, an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (aplurality of joint / DL / UL TCI states) (similar to operations 330 and 632 of Figs. 3 and 6) .
[0274] The UE receives 1150, from the network entity, a CORESET including scheduling information (similar to operations 350 and 652 of Figs. 3 and 6) .
[0275] The UE communicates 1175 with the network entity based on the scheduling information and the plurality of joint / DL / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operation (similar to operations 370 and 372 of Figs. 3 and 6) .
[0276] In aspects, the method further includes receiving, from the network entity, a configuration for multi-input-multi-output (MIMO) operation including a radio resource control (RRC) message configuring at least one of: (1) whether an uplink transmission is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or (2) a downlink control information (DCI) field in a DCI format related to beam selection or TCI state selection for downlink reception.
[0277] In some cases, the configuration for MIMO operation further comprises a configuration of the number of SRS resource set associated with a DCI field in DCI format 0_1 or DCI format 0_2. In some cases, the number of SRS resource set is one and the DCI field does not appear or further indicate which of the plurality of joint TCI states or plurality of UL TCI states (the plurality of joint / UL TCI states) is to be applied for the uplink transmissions to the network entity, and wherein the configuration for the MIMO operation is for a single transmission-reception-point (S-TRP) operation enabled or indicated for transmitting PUSCH transmission occasions.
[0278] In some cases, the method further includes determining a beam from the plurality of joint / UL TCI states for transmitting PUSCH transmission occasions to the network entity based on at least one of: (1) a predetermined joint / UL TCI state for uplink transmission; (2) a joint / UL TCI state configured by an RRC parameter additional to the configuration received; (3) a joint / UL TCI state instructed by a bit value of an SRS resource set indicator field in a DCI of the CORESET received; (4) a joint / UL TCI state configured by the network entity for transmitting the number of SRS resources set associated with codebook or non-codebook for DCI format 0_1 or DCI format 0_2; (5) a joint TCI state corresponding to a downlink TCI state or QCL assumption for receiving physical downlink control channel (PDCCH) occasions; or (6) a joint TCI state determined based on a starting control channel element (CCE) index of the PDCCH occasions.
[0279] In aspects, the configuration for MIMO operation further comprises a configuration of a TCI selection field associated with TCI selection in DCI format 1_1 or DCI format 1_2 for applying one of the plurality of joint TCI states or plurality of DL TCI states (the plurality of joint / DL TCI states) to receive physical downlink shared channel (PDSCH) occasions, the TCI selection field in a DCI of the CORESET received.
[0280] In some cases, the configuration for MIMO operation comprises a radio resource control (RRC) parameter indicating whether the UE is configured or enabled for the M-TRP operation.
[0281] In some cases, the RRC parameter indicates that the UE is configured and enabled for the M-TRP operation. The method may further include deriving a receiving beam based on information in the TCI selection field comprising a bit value in the DCI of the CORESET; and receiving the PDSCH occasions based on the receiving beam.
[0282] In some cases, the RRC parameter indicates that the UE is not configured or enabled for the M-TRP operation. The method may further include determining whether a TCI selection field is present in a scheduling DCI of the CORESET; upon determining that the TCI selection field is present, identifying a bit-width of the TCI selection thereof; and deriving a receiving beam.
[0283] In some cases, the method further includes deriving the receiving beam based on at least one of: (1) a joint / DL TCI state indicated by a bit value of the TCI selection field in either DCI format 1_1 or DCI format 1_2; (2) a joint / DLTCI state indicated by a one-bit field in DCI format 1_2 or indicated by a two-bit field in DCI format 1_1; (3) a joint / DLTCI state configured by an RRC parameter additional to the configuration; or (4) a predefined joint / DL TCI state.
[0284] In aspects, the M-TRP operation comprises at least one of: space domain multiplexing (SDM) PDSCH; frequency domain multiplexing (FDM) PDSCH; time domain multiplexing (TDM) PDSCH; single frequency network (SFN) PDSCH; or coherent joint transmission (CJT) PDSCH.
[0285] 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. 1A, 1B, 3-10, 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.
[0286] The method 1200 starts by optionally transmitting 1220, to a UE, a configuration for MIMO operation (similar to operations 320 and 622 of Figs. 3 and 6) .
[0287] The network entity transmits 1230, to the UE, an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (aplurality of joint / DL / UL TCI states) (similar to operations 330 and 632 of Figs. 3 and 6) .
[0288] The network entity transmits 1250 a CORESET including scheduling information to the UE (similar to operations 350 and 652 of Figs. 3 and 6) .
[0289] The network entity communicates 1275 with the UE based on the scheduling information and the plurality of joint / DL / UL TCI states without transmitting indication of sounding reference signal (SRS) resource set for uplink transmissions or without transmitting configuration for enabling multiple transmission-reception-point (M-TRP) operation (similar to operations 370 and 372 of Figs. 3 and 6) .
[0290] 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.
[0291] 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.
[0292] 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) .
[0293] 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 1013, the DU 1014, or the CU 110.
[0294] 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.
[0295] As discussed in Figs. 1A and 1B and implemented with respect to Figs. 3-10, the beam determination component 140 is configured to receive, from the network entity 104, an indication of a plurality of joint TCI states, a plurality DL TCI states, or a plurality of UL TCI states (aplurality of joint / DL / UL TCI states) ; receive a control resource set (CORESET) including scheduling information; and communicate with the network entity based on the scheduling information and the plurality of joint / DL / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operation.
[0296] The beam determination 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 beam determination 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.
[0297] 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, 1014, 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 1014 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 1014.
[0298] The DU 1014 may include a DU processor 1426, which may have on-chip memory 1426'. In some aspects, the DU 1014 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 1014 may communicate with the RU 106 through a fronthaul link 160 between the communications interface 1428 of the DU 1014 and a communications interface 1408 of the RU 106.
[0299] 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.
[0300] 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 beam determination 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 1014; each of the CU 110, the DU 1014, and the RU 106; the DU 1014; both the DU 1014 and the RU 106; or the RU 106.
[0301] The beam determination component 150 may perform various operations and signaling (such as the operations in Figs. 3 -10 and 12) 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 beam determination 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.
[0302] 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.
[0303] 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.
[0304] 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.
[0305] 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.
[0306] 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.
[0307] 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.
[0308] 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.
[0309] 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.
[0310] 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.
[0311] 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.
[0312] 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. ) .
[0313] 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” .
[0314] 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.
[0315] 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.
[0316] The following additional considerations may apply to the foregoing and the following discussions.
[0317] 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.
[0318] 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.
[0319] 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.
[0320] 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.
[0321] 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.
[0322] 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.
[0323] 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.
[0324] Example Aspects
[0325] Example 1 is a method of wireless communications by a user equipment (UE) , the method comprising:
[0326] receiving, from a network entity, a configuration for multi-input-multi-output (MIMO) operations;
[0327] receiving, from the network entity, an indication of a plurality of joint downlink (DL) (joint / DL) transmission configuration indicator (TCI) states, a plurality of joint uplink (UL) (joint / UL) TCI states, or both;
[0328] receiving a control resource set (CORESET) including scheduling information; and
[0329] communicating with the network entity based on the scheduling information and the plurality of joint / DL or joint / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operations.
[0330] Example 2 is a method of example 1, wherein the configuration for MIMO operations comprises a radio resource control (RRC) message configuring at least one of:
[0331] (1) whether an uplink transmission from the UE to the network entity is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or
[0332] (2) a downlink control information (DCI) field in a DCI format related to beam selection or TCI state selection for downlink reception.
[0333] Example 3 is a method of example 2, wherein the configuration for MIMO operations further comprises a configuration of the number of SRS resource set associated with a DCI field in DCI format 0_1 or DCI format 0_2.
[0334] Example 4 is a method of example 3, wherein the number of SRS resource set is two and wherein the configuration for MIMO operations is for an M-TRP operation enabled or indicated for transmitting physical uplink shared channel (PUSCH) transmission occasions.
[0335] Example 5 is a method of example 4, further comprising:
[0336] deriving a beam from the plurality of joint / UL TCI states based on an SRS resource set indicator field identifying the beam by a number of bits, and wherein the communicating with the network entity comprises transmitting the PUSCH transmission occasions using the derived beam.
[0337] Example 6 is a method of example 3, wherein the number of SRS resource set is one and the DCI field does not appear or further indicate which of the plurality of joint / UL TCI states is to be applied for the uplink transmissions to the network entity, and wherein the configuration for the MIMO operations is for a single transmission-reception-point (TRP) operation enabled or indicated for transmitting PUSCH transmission occasions.
[0338] Example 7 is a method of example 6, further comprising:
[0339] determining a beam from the plurality of joint / UL TCI states for transmitting PUSCH transmission occasions to the network entity based on at least one of:
[0340] (1) a predetermined joint / UL TCI state for uplink transmission;
[0341] (2) a joint / UL TCI state configured by an RRC parameter additional to the configuration received;
[0342] (3) a joint / UL TCI state instructed by a bit value of an SRS resource set indicator field in a DCI of the CORESET received;
[0343] (4) a joint / UL TCI state configured by the network entity for transmitting the number of SRS resources set associated with codebook or non-codebook for DCI format 0_1 or DCI format 0_2;
[0344] (5) a unified / joint TCI state corresponding to a downlink TCI state or QCL assumption for receiving physical downlink control channel (PDCCH) occasions; or
[0345] (6) a unified / joint TCI state determined based on a starting control channel element (CCE) index of the PDCCH occasions.
[0346] Example 8 is a method of example 2, wherein the configuration for MIMO operations further comprises a configuration of a TCI selection field associated with TCI selection in DCI format 1_1 or DCI format 1_2 for applying one of the plurality of the joint / DL TCI states to receive physical downlink shared channel (PDSCH) occasions, the TCI selection field in a DCI of the CORESET received.
[0347] Example 9 is a method of example 8, wherein the configuration for MIMO operations comprises a radio resource control (RRC) parameter indicating whether the UE is configured or enabled for the M-TRP operations.
[0348] Example 10 is a method of example 9, wherein the RRC parameter indicates that the UE is configured and enabled for the M-TRP operations, and the method further comprising:
[0349] deriving a receiving beam based on information in the TCI selection field comprising a bit value in the DCI of the CORESET; and
[0350] receiving the PDSCH occasions based on the receiving beam.
[0351] Example 11 is a method of example 9, wherein the RRC parameter indicates that the UE is not configured or enabled for the M-TRP operations, and the method further comprising:
[0352] determining whether a TCI selection field is present in a scheduling DCI of the CORESET;
[0353] upon determining that the TCI selection field is present, identifying a bit-width of the TCI selection thereof; and
[0354] deriving a receiving beam.
[0355] Example 12 is a method of example 11, further comprising:
[0356] deriving the receiving beam based on at least one of:
[0357] (1) a joint / DL TCI state indicated by a bit value of the TCI selection field in either DCI format 1_1 or DCI format 1_2;
[0358] (2) a joint / DLTCI state indicated by a one-bit field in DCI format 1_2 or indicated by a two-bit field in DCI format 1_1;
[0359] (3) a joint / DLTCI state configured by an RRC parameter additional to the configuration; or
[0360] (4) a predefined joint / DLTCI state.
[0361] Example 13 is a method of any one of examples 1-12, wherein the M-TRP operations comprises at least one of:
[0362] space domain multiplexing (SDM) PDSCH;
[0363] frequency domain multiplexing (FDM) PDSCH;
[0364] time domain multiplexing (TDM) PDSCH;
[0365] single frequency network (SFN) PDSCH; or
[0366] coherent joint transmission (CJT) PDSCH.
[0367] Example 14 is a method of wireless communications by a network entity, the method comprising:
[0368] transmitting, to a user equipment (UE) , a configuration for multi-input-multi-output (MIMO) operations;
[0369] transmitting, to the UE, an indication of a plurality of joint downlink (DL) (joint / DL) transmission configuration indicator (TCI) states, a plurality of joint uplink (UL) (joint / UL) TCI states, or both;
[0370] transmitting, to the UE, a control resource set (CORESET) including scheduling information; and
[0371] communicating with the UE based on the scheduling information and the plurality of joint / DL or joint / UL TCI states without transmitting indication of sounding reference signal (SRS) resource set for uplink transmissions or without transmitting configuration for enabling multiple transmission-reception-point (M-TRP) operations.
[0372] Example 15 is a method of example 14, wherein the configuration for the MIMO operations comprises a radio resource control (RRC) message configuring at least one of:
[0373] (1) whether an uplink transmission from the UE to the network entity is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or
[0374] (2) a downlink control information (DCI) field in a DCI format related to beam selection for downlink reception.
[0375] Example 16 is a method of example 15, wherein the configuration for the MIMO operations further comprises a configuration of the number of SRS resource set associated with a DCI field in DCI format 0_1 or DCI format 0_2.
[0376] Example 17 is a method of example 16, wherein the number of SRS resource set is two and wherein the configuration for the MIMO operations is for an M-TRP operation enabled or indicated for receiving physical uplink shared channel (PUSCH) transmission occasions from the UE.
[0377] Example 18 is a method of example 17, wherein the communicating with the UE comprises receiving the PUSCH transmission occasions using a beam derived from the plurality of joint / UL TCI states based on an SRS resource indicator field identifying the beam by a number of bits.
[0378] Example 19 is a method of example 16, wherein the number of SRS resource set is one and the DCI field does not appear or further indicate which of the plurality of joint / UL TCI states is to be applied for the uplink transmissions to the network entity, and wherein the configuration for the MIMO operations is for a single transmission-reception-point (TRP) operation enabled or indicated for transmitting PUSCH transmission occasions.
[0379] Example 20 is a method of example 19, further comprising:
[0380] restraining from transmitting at least one of:
[0381] DCI format 0_1 or DCI format 0_2;
[0382] a medium access control (MAC) control element (CE) activating being capable of activating or mapping two joint / UL TCI states to a TCI codepoint;
[0383] an indication activating or mapping at least two joint / UL TCI states to a TCI codepoint when transmitting a TCI activation MAC-CE; or
[0384] a DCI with a TCI field codepoint indicating two joint / UL TCI states.
[0385] Example 21 is a method of example 15, wherein the configuration for the MIMO operations further comprises a configuration of a TCI selection field in DCI format 1_1 or DCI format 1_2.
[0386] Example 22 is a method of example 21, wherein the configuration for the MIMO operations comprises a radio resource control (RRC) parameter indicating whether the UE is configured or enabled for the M-TRP operations.
[0387] Example 23 is a method of example 22, wherein the RRC parameter indicates that the UE is not configured or enabled for the M-TRP operations, and the method further comprising at least one of:
[0388] refraining from indicating two joint / DL TCI states via the TCI selection field; or
[0389] refraining from configuring a TCI selection field in a DCI.
[0390] Example 24 is a method of example 23, wherein the method further comprising refraining from indicating “10” in the TCI selection field.
[0391] Example 25 is an apparatus comprising:
[0392] one or more radio frequency (RF) modems;
[0393] a processor coupled to the one or more RF modems; and
[0394] at 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 examples 1 to 24.
[0395] Example 26 is a method of a User Equipment (UE) , the method comprising:
[0396] receiving one or more RRC parameter (s) , configuring whether codebook (CB) based or non-codebook (NCB) based Uplink (UL) transmission is used, and / or one or more SRS resource set(s) associated with CB / NCB for DCI format 0_1 / 0_2, which is related to presence of a first DCI field in DCI format 0_1 / 0_2;
[0397] receiving one or more RRC parameter (s) , configuring a second DCI field is present in DCI format 1_1 / 1_2;
[0398] receiving indication of a first indicated joint / DL / UL TCI state and / or a second indicated joint / DL / UL TCI state;
[0399] detecting the scheduling DCI with DCI format 0_1 / 0_2 or DCI format 1_1 / 1_2 on a CORESET,
[0400] decoding the scheduling DCI based on a determination of whether S-TRP operation or M-TRP operation is configured / enabled / indicated for PUSCH transmission occasion (s) or PDSCH reception occasion (s) scheduled by the scheduling DCI;
[0401] deriving transmitting beam (s) or receiving beam (s) based on the determination;
[0402] transmitting or receiving scheduled PUSCH transmission occasion (s) or PDSCH reception occasion (s) based on derived transmitting beam (s) or receiving beam (s) .
[0403] Example 27 is a method of example 26, wherein:
[0404] If the scheduling DCI format is with DCI format 0_1 / 0_2, the determination of whether S-TRP operation or M-TRP operation is configured / enabled / indicated for PUSCH is further comprising:
[0405] If the number of configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2 is two, M-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) ;
[0406] If the number of configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2 is one, S-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) .
[0407] Example 28 is a method of example 26, wherein:
[0408] If the scheduling DCI format is with DCI format 1_1 / 1_2, the determination of whether S-TRP operation or M-TRP operation is configured / enabled / indicated for PDSCH is further comprising:
[0409] If the UE receives any RRC parameter configuring / enabling a MTRP PDSCH feature / scheme, M-TRP operation is configured / enabled / indicated for scheduled PDSCH transmission occasion (s) ;
[0410] If the UE does not receive any RRC parameter configuring / enabling a MTRP PDSCH feature / scheme, S-TRP operation is configured / enabled / indicated for scheduled PDSCH transmission occasion (s) .
[0411] Example 29 is a method of example 27, wherein:
[0412] Deriving transmitting beam (s) based on the determination is further comprising:
[0413] If M-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) , the UE determines the first DCI field is present and comprises two bits in the scheduling DCI, and the UE derives transmitting beam (s) based on the first DCI field;
[0414] If S-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) , the UE utilizes a first signaling / mechanism to derive transmitting beam (s) .
[0415] Example 30 is a method of example 28, wherein:
[0416] Deriving receiving beam (s) based on the determination is further comprising:
[0417] If M-TRP operation is configured / enabled / indicated for scheduled PDSCH reception occasion (s) , the UE determines the second DCI field is present and comprises two bits in the scheduling DCI, and the UE derives receiving beam (s) based on the second DCI field;
[0418] If S-TRP operation is configured / enabled / indicated for scheduled PDSCH reception occasion (s) , the UE determines whether the second DCI field is present in the scheduling DCI, and / or bit-width of the second DCI field, if present, based on a second signaling / mechanism, and the UE derives receiving beam (s) based on the second DCI field, if present, and / or the second signaling / mechanism.
[0419] Example 31 is a method of example 29, wherein:
[0420] The first signaling / mechanism comprising one of the first indicated joint / UL TCI state, the second indicated joint / UL TCI state, an indicated joint / UL TCI state configured by additional RRC parameter, an indicated joint / UL TCI state instructed by the first DCI field comprising one bit, or an indicated joint / UL TCI state configured to be applied for transmitting the configured SRS resource set associated with CB / NCB for DCI format 0_1 / 0_2.
[0421] Example 32 is a method of example 30, wherein:
[0422] The second signaling / mechanism comprising one of an indicated joint / DL TCI state instructed by the second DCI field comprising one bit, an indicated joint / DL TCI state instructed by the second DCI field comprising two bits with reserved codepoint (s) , or an indicated joint / DL TCI state configured by another additional RRC parameter.
[0423] Example 33 is a method of example 26, wherein:
[0424] The first DCI field is an SRS resource indicator field.
[0425] Example 34 is a method of example 26, wherein:
[0426] The second DCI field is a TCI selection field.
[0427] Example 35 is a method of example 28, wherein:
[0428] The MTRP PDSCH feature / scheme is one of SDM PDSCH, FDM PDSCH, TDM PDSCH, SFN PDSCH or CJT PDSCH.
[0429] Example 36 is a method of a network (NW) entity, the method comprising:
[0430] transmitting one or more RRC parameter (s) , configuring whether codebook (CB) based or non-codebook (NCB) based Uplink (UL) transmission is used, and / or one or more SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2, which is related to presence of a first DCI field in DCI format 0_1 / 0_2;
[0431] transmitting one or more RRC parameter (s) , configuring a second DCI field is present in DCI format 1_1 / 1_2;
[0432] transmitting indication of a first indicated joint / DL / UL TCI state and / or a second indicated joint / DL / UL TCI state;
[0433] transmitting the scheduling DCI with DCI format 0_1 / 0_2 or DCI format 1_1 / 1_2 on a CORESET,
[0434] indicating information in the scheduling DCI based on a determination of whether S-TRP operation or M-TRP operation is configured / enabled / indicated for PUSCH transmission occasion (s) or PDSCH reception occasion (s) scheduled by the scheduling DCI;
[0435] deriving receiving beam (s) or transmitting beam (s) based on the determination;
[0436] receiving or transmitting scheduled PUSCH transmission occasion (s) or PDSCH reception occasion (s) based on derived receiving beam (s) or transmitting beam (s) .
[0437] Example 37 is a method of example 36, wherein:
[0438] If the scheduling DCI format is with DCI format 0_1 / 0_2, the determination of whether S-TRP operation or M-TRP operation is configured / enabled / indicated for PUSCH is further comprising:
[0439] If the number of configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2 is two, M-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) ;
[0440] If the number of configured SRS resource set (s) associated with CB / NCB for DCI format 0_1 / 0_2 is one, S-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) .
[0441] Example 38 is a method of example 36, wherein:
[0442] If the scheduling DCI format is with DCI format 1_1 / 1_2, the determination of whether S-TRP operation or M-TRP operation is configured / enabled / indicated for PDSCH is further comprising:
[0443] If the NW entity transmits any RRC parameter configuring / enabling a MTRP PDSCH feature / scheme, M-TRP operation is configured / enabled / indicated for scheduled PDSCH transmission occasion (s) ;
[0444] If NW entity does not transmit any RRC parameter configuring / enabling a MTRP PDSCH feature / scheme, S-TRP operation is configured / enabled / indicated for scheduled PDSCH transmission occasion (s) .
[0445] Example 39 is a method of example 37, wherein:
[0446] Deriving receiving beam (s) based on the determination is further comprising:
[0447] If M-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) , the NW entity indicates the first DCI field comprising two bits in the scheduling DCI, and the NW entity derives receiving beam (s) based on the first DCI field;
[0448] If S-TRP operation is configured / enabled / indicated for scheduled PUSCH transmission occasion (s) , the NW entity utilizes a first signaling / mechanism to derive receiving beam (s) .
[0449] Example 40 is a method of example 38, wherein:
[0450] Deriving transmitting beam (s) based on the determination is further comprising:
[0451] If M-TRP operation is configured / enabled / indicated for scheduled PDSCH reception occasion (s) , the NW entity indicates the second DCI field comprising two bits in the scheduling DCI, and the NW entity derives transmitting beam (s) based on the second DCI field;
[0452] If S-TRP operation is configured / enabled / indicated for scheduled PDSCH reception occasion (s) , the NW entity determines whether to indicate the second DCI field in the scheduling DCI, and / or bit-width of the second DCI field, if indicated, based on a second signaling / mechanism, and the NW entity derives transmitting beam (s) based on the second DCI field, if indicated, and / or the second signaling / mechanism.
[0453] Example 41 is a method of example 39, wherein:
[0454] The first signaling / mechanism comprising one of the first indicated joint / UL TCI state, the second indicated joint / UL TCI state, an indicated joint / UL TCI state configured by additional RRC parameter, an indicated joint / UL TCI state instructed by the first DCI field comprising one bit, or an indicated joint / UL TCI state configured to be applied for transmitting the configured SRS resource set associated with CB / NCB for DCI format 0_1 / 0_2.
[0455] Example 42 is a method of example 40, wherein:
[0456] The second signaling / mechanism comprising one of an indicated joint / DL TCI state instructed by the second DCI field comprising one bit, an indicated joint / DL TCI state instructed by the second DCI field comprising two bits with reserved codepoint (s) , or an indicated joint / DL TCI state configured by another additional RRC parameter.
[0457] Example 43 is a method of example 36, wherein:
[0458] The first DCI field is an SRS resource indicator field.
[0459] Example 44 is a method of example 36, wherein:
[0460] The second DCI field is a TCI selection field.
[0461] Example 45 is a method of example 38, wherein:
[0462] The MTRP PDSCH feature / scheme is one of SDM PDSCH, FDM PDSCH, TDM PDSCH, SFN PDSCH or CJT PDSCH.
Claims
1.A method of wireless communications by a user equipment (UE) , the method comprising:receiving (330) , from a network entity, an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (a plurality of joint / DL / UL TCI states) ;receiving (350) a control resource set (CORESET) including scheduling information; andcommunicating (370) with the network entity based on the scheduling information and the plurality of joint / DL / UL TCI states without receiving indication of sounding reference signal (SRS) resource set for uplink transmissions or without receiving configuration for enabling multiple transmission-reception-point (M-TRP) operation.2.The method of claim 1, further comprising receiving, from the network entity, a configuration for multi-input-multi-output (MIMO) operation including a radio resource control (RRC) message configuring at least one of:(1) whether an uplink transmission is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or(2) a downlink control information (DCI) field in a DCI format related to beam selection or TCI state selection for downlink reception.3.The method of claim 2, wherein the configuration for MIMO operation further comprises a configuration of the number of SRS resource set associated with a DCI field in DCI format 0_1 or DCI format 0_2.4.The method of claim 3, wherein the number of SRS resource set is one and the DCI field does not appear or further indicate which of the plurality of joint TCI states or plurality of UL TCI states (the plurality of joint / UL TCI states) is to be applied for the uplink transmissions to the network entity, and wherein the configuration for the MIMO operation is for a single transmission-reception-point (S-TRP) operation enabled or indicated for transmitting PUSCH transmission occasions.5.The method of claim 4, further comprising:determining a beam from the plurality of joint / UL TCI states for transmitting PUSCH transmission occasions to the network entity based on at least one of:(1) a predetermined joint / UL TCI state for uplink transmission;(2) a joint / UL TCI state configured by an RRC parameter additional to the configuration received;(3) a joint / UL TCI state instructed by a bit value of an SRS resource set indicator field in a DCI of the CORESET received;(4) a joint / UL TCI state configured by the network entity for transmitting the number of SRS resources set associated with codebook or non-codebook for DCI format 0_1 or DCI format 0_2;(5) a joint TCI state corresponding to a downlink TCI state or QCL assumption for receiving physical downlink control channel (PDCCH) occasions; or(6) a joint TCI state determined based on a starting control channel element (CCE) index of the PDCCH occasions.6.The method of claim 2, wherein the configuration for MIMO operation further comprises a configuration of a TCI selection field associated with TCI selection in DCI format 1_1 or DCI format 1_2 for applying one of the plurality of joint TCI states or plurality of DL TCI states (the plurality of joint / DL TCI states) to receive physical downlink shared channel (PDSCH) occasions, the TCI selection field in a DCI of the CORESET received.7.The method of claim 6, wherein the configuration for MIMO operation comprises a radio resource control (RRC) parameter indicating whether the UE is configured or enabled for the M-TRP operation.8.The method of claim 7, wherein the RRC parameter indicates that the UE is configured and enabled for the M-TRP operation, and the method further comprising:deriving a receiving beam based on information in the TCI selection field comprising a bit value in the DCI of the CORESET; andreceiving the PDSCH occasions based on the receiving beam.9.The method of claim 7, wherein the RRC parameter indicates that the UE is not configured or enabled for the M-TRP operation, and the method further comprising:determining whether a TCI selection field is present in a scheduling DCI of the CORESET;upon determining that the TCI selection field is present, identifying a bit-width of the TCI selection thereof; andderiving a receiving beam.10.The method of claim 9, further comprising:deriving the receiving beam based on at least one of:(1) a joint / DL TCI state indicated by a bit value of the TCI selection field in either DCI format 1_1 or DCI format 1_2;(2) a joint / DLTCI state indicated by a one-bit field in DCI format 1_2 or indicated by a two-bit field in DCI format 1_1;(3) a joint / DLTCI state configured by an RRC parameter additional to the configuration; or(4) a predefined joint / DL TCI state.11.The method of any one of claims 1-12, wherein the M-TRP operation comprises at least one of:space domain multiplexing (SDM) PDSCH;frequency domain multiplexing (FDM) PDSCH;time domain multiplexing (TDM) PDSCH;single frequency network (SFN) PDSCH; orcoherent joint transmission (CJT) PDSCH.12.A method of wireless communications by a network entity, the method comprising:transmitting (330) , to a user equipment (UE) , an indication of a plurality of joint transmission configuration indicator (TCI) states, a plurality downlink (DL) TCI states, or a plurality of uplink (UL) TCI states (a plurality of joint / DL / UL TCI states) ;transmitting (350) , to the UE, a control resource set (CORESET) including scheduling information; andcommunicating (370) with the UE based on the scheduling information and the plurality of joint / DL / UL TCI states without transmitting indication of sounding reference signal (SRS) resource set for uplink transmissions or without transmitting configuration for enabling multiple transmission-reception-point (M-TRP) operation.13.The method of claim 12, further comprising transmitting, to the UE, a configuration for multi-input-multi-output (MIMO) operation including a radio resource control (RRC) message configuring at least one of:(1) whether an uplink transmission is a codebook based uplink transmission or a non-codebook based uplink transmission, and a number of SRS resource set for the uplink transmission; or(2) a downlink control information (DCI) field in a DCI format related to beam selection for downlink reception.14.The method of claim 13, wherein the configuration for the MIMO operation further comprises:a configuration of the number of SRS resource set associated with a DCI field in DCI format 0_1 or DCI format 0_2; ora configuration of a TCI selection field in DCI format 1_1 or DCI format 1_2.15.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 14.
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