Method and apparatus for performing beam indication and pathloss determination with uplink-only transmission reception point in a wireless communication system
By configuring separate and joint TCI states with pathloss RS and offsets, the solution effectively manages beam indication and pathloss in hetnets with one TRP serving only UL transmissions, improving throughput and reducing power consumption.
Patent Information
- Application Number
- PCT/CN2024/074238
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-07-31
AI Technical Summary
In heterogeneous networks with one TRP serving only UL transmissions and the other TRP serving both DL and UL, there are no established rules for configuring TCI states, indicating pathloss RS, and determining pathloss offsets, leading to ambiguity in beam indication and pathloss calculation.
The proposed solution involves configuring separate TCI states for UL and DL transmissions, using pathloss RS and offsets based on indicated TCI states, and implementing joint TCI states for specific scenarios, with explicit or implicit TRP identifier configurations to manage beam indication and pathloss determination.
This approach enables effective beam indication and pathloss determination in hetnet scenarios, enhancing UL throughput and reducing power consumption by addressing the lack of defined procedures for TRPs with suppressed DL transmissions.
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Figure CN2024074238_31072025_PF_FP_ABST
Abstract
Description
METHOD AND APPARATUS FOR PERFORMING BEAM INDICATION AND PATHLOSS DETERMINATION WITH UPLINK-ONLY TRANSMISSION RECEPTION POINT IN A WIRELESS COMMUNICATION SYSTEM
[0001] FIELD OF THE DISCLOSURE
[0002] This document generally describes methods and devices operating in wireless communication systems such as (but not limited to) the ones described in fifth generation (5G) standard documents, known as 3rd Generation Partnership Project (3GPP) communication systems.BACKGROUND
[0003] This background description is provided for the purpose of generally presenting the context of the disclosure and the technical problems. Work of the presently named inventors, to the extent it is 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, are neither expressly nor impliedly admitted as prior art against the present disclosure.
[0004] To meet the increasing data rate requirements in 5G and beyond, the deployment of heterogeneous networks (hetnets) has been proposed. A hetnet may include first and second transmission-reception points (TRPs) and the user equipment (UE) may simultaneously exchange data, in a different manner, with the network using both the first and second TRPs (thus the name “heterogenous” ) . Hetnets may increase network capacity by adding more cell sites, e.g., radio access networks, macro sites, in-building wireless, and small cell deployments. Thus, hetnets use a combination of macro, pico, and femto cells to offer network densification. Hetnets may incorporate different access technologies like 4G, 5G, and Wi-Fi.
[0005] Such hetnets provide benefits or potential of boosting uplink (UL) throughput, and saving power consumption of one TRP by shutting down or reducing downlink (DL) transmission for that TRP. However, when the DL transmission of the TRP is restricted or completely suppressed, there are no defined rules for performing beam indication (i.e., generate and / or transmit transmission configuration indicator (TCI) ) , calculate a pathloss for the UL transmission of the TRP that has the suppressed DL transmission, and / or how to configure or indicate a pathloss offset for the UL transmission toward the TRP with the suppressed DL transmission.
[0006] The hetnet scenario may include two TRPs, where one of them only serves UL transmissions. The other TRP may serve mostly (if not only) DL transmissions or serve both DL transmission and UL transmission including physical uplink share channel (PUSCH) . Such hetnet scenario provides benefits or potential of boosting UL throughput, meanwhile saving power consumption of one TRP by shutting down or reducing DL transmission.
[0007] However, in such a hetnet scenario, where one TRP only serves the UL transmission and has no DL transmission, there are no established rules or procedures about how to configure DL and UL transmission associated with these two TRPs. For example, it is unknown how to properly configure a TCI state type, joint or separate. In addition, it is unknown how to activate / indicate an appropriate TCI state combination via a medium access control (MAC) control element (CE) or downlink control indicator (DCI) . One ambiguity in addressing the above noted matter may come from the fact that it is undefined whether the two TRP system with suppressed DL transmission in one of the TRPs is in a single TRP (S-TRP) mode or multiple TRP (M-TRP) mode from the UE’s point of view.
[0008] Another issue is how to determine or calculate a pathloss for such a hetnet system as traditionally, where the network entity (NE) sends a DL reference signal (RS) for evaluating the pathloss. For the above noted scenario, there is one TRP only providing UL transmission, which means there would be issues of pathloss calculation since no pathloss RS is transmitted from the UL transmission only TRP. Hence, how to configure / indicate a pathloss RS for UL transmission toward such UL transmission only TRP is unknown. In addition to the pathloss RS configuration / indication, a pathloss offset could be necessary to be configured / indicated by the NE for assisting the UE to determine the pathloss. It is also unknown how to properly configure and / or indicate a pathloss offset. Therefore, there is a need to address the above noted issues.SUMMARY
[0009] The embodiments discussed herein address beam indication and pathloss determination for two hetnet scenarios with DL transmission suppression in one of the two TRPs. That is, DL operation may be handled by a single-TRP (S-TRP) and UL operation may be handled by multiple-TRP (M-TRP) .
[0010] According to a first scenario, the DL transmission of the second TRP is suppressed and the UL transmission of the first TRP is restricted to only sounding reference signal (SRS) transmission for antenna switching (AS) . In some cases, there is no UL transmission toward to the first TRP, even if it is SRS for AS. For this first scenario, a joint TCI state mode cannot be configured. A NE can only configure a separate TCI state mode (e.g., DL TCI state and / or UL TCI state) . The SRS transmission for AS to the first TRP does not follow an indicated UL TCI in the separate TCI state mode. SRS transmission for non-codebook (NCB) to the second TRP is not configured with an associated channel state information-reference signal (CSI-RS) . The UE acquires UL power control (PC) parameters for SRS for the first TRP when using a DL indicated TCI state to derive an UL beam. For the second TRP, a pathloss calculation is based on: a pathloss RS configured in the indicated UL TCI state or a reference signal in an indicated DL TCI state, and a first pathloss offset.
[0011] According to a second scenario, the DL transmission of the second TRP is suppressed. For this scenario, the NE configures a joint TCI state mode or a separate TCI state mode. In some cases, if the separate TCI state mode is configured, only one DL TCI state can be activated and / or indicated. For both the joint and separate TCI state modes, if two joint / DL TCIs can be activated, the NE cannot configure a TCI selection field or the NE only configures the UE to apply one indicated joint / DL TCI. For the separate TCI state mode, if the NE activates or indicates two DL TCI states, the NE should indicate two identical DL TCIs. SRS transmission for NCB to the second TRP is not configured with associated CSI-RS. For the second TRP, a pathloss calculation is based on: a pathloss RS configured in a second indicated UL TCI state or a reference signal in a first indicated DL TCI state, and a second pathloss offset.BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate one or more embodiments and, together with the description, explain these embodiments.
[0013] FIG. 1 is a block diagram of an example system in which a distributed base station (BS) and / or a UE may implement the techniques of this document.
[0014] FIG. 2 is a block diagram of a distributed BS including a central unit (CU) and a distributed unit (DU) that may operate in the system of FIG. 1.
[0015] FIG. 3 schematically illustrates a first scenario with first and second TRPs, the first TRP performing a restricted UL transmission and the second TRP performing no DL transmission, only an UL transmission.
[0016] FIG. 4 is a message diagram of the UE and / or the NE operating according to the first scenario.
[0017] FIG. 5 is a flow chart illustrating steps performed by the UE and NE according to the first scenario.
[0018] FIG. 6 schematically illustrates a second scenario with first and second TRPs, the second TRP performing no DL transmission, only an UL transmission.
[0019] FIG. 7 is a message diagram of the UE and / or the NE operating according to the second scenario.
[0020] FIG. 8 is a flow chart illustrating steps performed by the UE and NE according to the second scenario.DETAILED DESCRIPTION
[0021] Methods and devices described in this section embody techniques related to performing beam indication in a system having two TRPs, where one of the two TRPs receives an UL transmission from a UE and does not send DL transmissions to the UE. The methods further address how to determine or calculate a pathloss and / or indicate or utilize a pathloss offset for the UL transmission to the TRP that does not support DL transmission.
[0022] The embodiment descriptions in this section refer to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. The detailed descriptions do preclude other embodiments within the scope of the appended claims. The embodiments are not limited to the described configurations but may be extended to other arrangements. For example, although the embodiments discussed in this document refer to a 2 TRP system, they could be applied for systems with more than 2 TRPs, having issue (s) or procedure (s) with similar consideration (s) or regard (s) in long term evolution (LTE) , or new radio (NR) or sixth generation (6G) or other radio access technologies (RATs) .
[0023] Reference throughout this section to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout the specification are not necessarily all referring to the same embodiment. Further, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.
[0024] Prior to discussing solutions for determining beam indication, pathloss, and / or pathloss offset for various scenarios involving two TRPs, where one of them only serves UL transmission, a wireless communication system in which such methods and solutions may be implemented is discussed first. FIG. 1 shows an example of a wireless communication system 100 that includes a UE 102, a first BS 104, a second BS 106, and a CN 110. The BSs 104 and 106 may operate in a radio access network (RAN) 105 connected to the CN 110. The CN 110 may be implemented as an evolved packet core (EPC) 111 or a 5G core (5GC) 160, for example. The CN 110 may also be implemented as a 6G core in another example.
[0025] The first BS 104 may cover one or more cells (e.g., cells 124 and 125) with one or more TRPs 107-i, (with i being an integer between 1 and 3 in the figure) and the second BS 106 may similarly cover one or more cells (e.g., cell 126) with one or more TRPs 108-i (with i being an integer between 1 and 2 in the figure) . For example, the first BS 104 operates cell 124 with TRPs 107-1 and 107-2 and operates cell 125 with TRP 107-3, and the second BS 106 operates cell 126 with TRPs 108-1 and 108-2. Note that the plural TRPs at a single base station may be implemented with different panels of the same antenna, or with different antennas.
[0026] Cells 124 and 125 may be operated on the same carrier frequency / frequencies. Cell 126 may be operated on the same carrier frequency / frequencies as cells 124 and 125. Alternatively, cell 126 may be operated on different carrier frequency / frequencies from cells 124 and 125. In some embodiments, the first BS 104 connects each of the TRPs 107-1, 107-2, and 107-3 via a fiber connection or an Ethernet connection. If the first BS 104 is a gNB, the cells 124 and 125 are NR cells. If the first BS 104 is an (ng-) eNB, the cells 124 and 125 are evolved universal terrestrial radio access (EUTRA) cells. Similarly, if the second BS 106 is a gNB, the cell 126 is an NR cell, and if the second BS 106 is an (ng-) eNB, the cell 126 is an EUTRA cell. Cells 124, 125, and 126 may be in the same RAN 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.
[0027] The UE 102 may support at least a 5G NR (or simply, “NR” ) or an E-UTRA air interface to communicate with the first 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 an E-UTRA air interface to communicate with the second BS 106 via the TRP 108-1 and / or TRP 108-2. Each of the first and second BS 104, 106 may connect to the CN 110 via an interface (e.g., S1 or NG interface) . The first and second BSs 104 and 106 may also be interconnected via an interface (e.g., X2 or Xn interface) for interconnecting NG RAN nodes.
[0028] When a BS (e.g., 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 in FIG. 1) , the first BS 104 may generate a packet including the data to be transmitted 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 embodiments, the first BS 104 may include control information for time-critical control and management information directly related to the data in the packet, and the TRP can transmit the data in accordance with the control information. In some embodiments, the data includes In-phase and Quadrature (IQ) data, a physical layer bit sequence, or a medium access control (MAC) packet data network (PDU) . When the TRP receives data from a UE (e.g., UE 102) , the TRP generates a packet including the data and transmits the packet to the first BS 104.
[0029] 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. SGW 112 in general is configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc. MME 114 is configured to manage authentication, registration, paging, and other related functions. 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, 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.
[0030] As illustrated in FIG. 1, the first BS 104 supports cells 124 and 125, and the second BS 106 supports a cell 126. 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 first BS 104 and second BS 106 may support an X2 or Xn interface. In general, the CN 110 may connect to any suitable number of BSs supporting NR cells and / or EUTRA cells.
[0031] The first BS 104 is equipped with processing hardware 130 that may include one or more general-purpose processors (e.g., CPUs 132) and a non-transitory computer-readable memory 134 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 TRP controller 133 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 TRP controller 133 is also configured to receive data and control signal on physical UL channels and / or UL reference signals with 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 may further include an RRC controller 135 to implement procedures and messaging at the RRC sublayer of the protocol communication stack. The processing hardware 130 further includes one or more transceivers 136 for exchanging information with the UE 102. The second BS 106 may include processing hardware 140 that is similar to processing hardware 130. In particular, components 142 to 146 may be similar to components 132 to 136, respectively.
[0032] The UE 102 is equipped with processing hardware 150 that may include one or more general-purpose processors 152 such as CPUs and non-transitory computer-readable memory 154 storing machine-readable instructions executable on the one or more general-purpose processors, and / or special-purpose processing units. The TRP controller 153 is also configured to receive data and control signal on physical DL channels and / or DL reference signals with the first and second 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 TRP controller 153 is also configured to transmit data and control signal on physical UL channels and / or UL reference signals with the first and second 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 may also include an RRC controller 155 to implement procedures and messaging at the RRC sublayer of the protocol communication stack, and one or more transceivers 156 for supporting the data exchange with the TRPs.
[0033] FIG. 2 illustrates a distributed or disaggregated structure 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 (not shown) , and an RRC controller (e.g., RRC controller 135, 145 shown in FIG. 1) . In some embodiments, the CU 172 may include a radio link control (RLC) controller configured to manage or control one or more RLC operations or procedures. In other embodiments, the CU 172 does not include an RLC controller.
[0034] 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 (not shown) configured to manage or control one or more MAC operations or procedures (e.g., a random access procedure) , and / or an RLC controller (not shown) configured to manage or control one or more RLC operations or procedures. The processing hardware may also include a physical layer controller (not shown) configured to manage or control one or more physical layer operations or procedures. In some embodiments, RAN 105 supports Integrated Access and Backhaul (IAB) functionality. In some embodiments, the DU 174 operates as an (IAB) -node, and the CU 172 operates as an IAB-donor.
[0035] In some embodiments, 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) .
[0036] Having introduced one possible configuration of the wireless communication system 100, generally applicable descriptions for the methods and embodiments discussed in this disclosure are provided. A TRP identifier may be used for description related to multi-TRP (M-TRP) . In some embodiments, 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 embodiments, a network entity NE 101 (e.g., as shown in FIG. 1, the NE may be one or more of the first BS station 104 or second BS 106) includes or configures a TRP identifier in UL configuration (s) that the NE 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 physical downlink control channel (PDCCH) configuration, 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 NE transmits to the UE. In some embodiments, the UL transmission (s) include PUSCH transmission (s) , PUCCH transmission (s) and / or SRS transmission (s) . In some embodiments, the NE includes a TRP identifier in DL configuration (s) that the NE 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 NE transmits to the UE. In some embodiments, 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) .
[0037] In other embodiments, the NE 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 embodiments, the UE derives a TRP (identifier) from the implicit indication. In some embodiments, the NE transmits an RRC message (e.g., RRC reconfiguration message or a RRC resume message) including the configuration parameters to the UE.
[0038] A possible description of first and second TRP identifiers is now provided. In some embodiments, the NE configures or indicates to the UE a first TRP identifier. In some embodiments, the UE derives a first TRP identifier (value) . In some embodiments, the NE configures or indicates to the UE a second TRP identifier (value) . In some embodiments, the UE derives a second TRP identifier (value) . In some embodiments, the first TRP identifier may be associated with the first TRP. In some embodiments, the second TRP identifier may be associated with the second TRP.
[0039] In some embodiments, the NE configures that a serving cell is associated with the first TRP or the first TRP identifier (value) . In some embodiments, the NE configures a first control resource set (CORESET) associated with the serving cell or first TRP. The NE may configure coresetPoolIndex #0 to identify the first CORESET. In one implementation, the NE may transmit to the UE an 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 NE, which implies that the UE monitors a PDCCH or receives DCIs via the first TRP from the NE (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 NE. In some embodiments, the first TRP identifier (value) may be coresetPoolIndex #0.
[0040] In one embodiment, the NE configures the serving cell to be associated with the second TRP or the second TRP identifier (value) . In another embodiment, the second TRP is associated with a non-serving cell, and the NE indicates or configures the association in an RRC message. In one implementation, the NE configures the non-serving cell associated with the second TRP or the second TRP identifier (value) . In some embodiments, the NE configures a second CORESET to be associated with the serving cell, non-serving cell, or second TRP. The NE may configure coresetPoolIndex #1 to identify the second CORESET. In one implementation, the NE may transmit to the UE an 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 NE, which implies that the UE monitors a PDCCH or receives DCIs via the second TRP from the NE (i.e., from the second TRP) . In such a case, the UE determines that coresetPoolIndex #1 indicates a TRP (i.e., the second TRP) . In some embodiments, the second TRP identifier (value) may be coresetPoolIndex #1.
[0041] A beam indication procedure under a unified TCI framework, including RRC, MAC-CE, and DCI is now described. In the following, a beam indication includes one or more TCI states. The RRC configuration for the unified TCI framework is discussed first.
[0042] In some embodiments, the NE may configure the UE with one or more TCI state lists for a component carrier (CC) of a serving cell, where the CC could be a primary cell (PCell) or a secondary cell (SCell) . For example, the NE may configure a joint TCI state list for a CC of a serving cell. For example, the NE 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 include one or more joint TCI states. One DL TCI state list may include one or more DL TCI states. One UL TCI state list may include one or more UL TCI states.
[0043] In some embodiments, the NE may configure the UE with 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) is used for a serving cell. For example, the first RRC parameter unifiedTCI-StateType may indicate “joint” or “separate” . The first RRC parameter unifiedTCI-StateType may be used for one or more of the following purposes:
[0044] ● if the first RRC parameter for a CC of serving cell indicates “joint” , the NE could explicitly or implicitly configure the UE with one or more joint TCI state list (s) for the CC of serving cell or the UE;
[0045] ● if the first RRC parameter for a CC of serving cell indicates “separate” , the NE could explicitly or implicitly configure the UE with one or more DL TCI state list (s) for the CC of serving cell; and
[0046] ● if the first RRC parameter for a CC of serving cell indicates “separate” , the NE could explicitly or implicitly configure the UE with one or more UL TCI state list (s) for the CC of serving cell.
[0047] In some embodiments, if the NE explicitly configures the UE with one or more TCI state list (s) for a CC of a serving cell, it could imply that the NE configures the one or more TCI state list (s) (explicitly) under RRC configuration (e.g., ServingCellConfig) for a CC of the serving cell.
[0048] In some embodiments, if the NE implicitly configures the UE with one or more TCI state list (s) for a CC of the serving cell, it could imply at least one of the following:
[0049] ● the NE 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;
[0050] ● the UE refers the one or more TCI state list (s) for other serving cell (s) / CCs or a reference serving cell / CC; and
[0051] ● 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.
[0052] The beam indication may also be handled by MAC-CE activation. For example, a first MAC-CE may be configured to activate one or more configured unified TCI states. In some embodiments, the NE may transmit a first MAC-CE to the UE when or after the NE configures the UE with one or more TCI state list (s) for the CC of serving cell; and / or the UE refers or determines one or more TCI state list (s) for the CC of serving cell.
[0053] In some embodiments, 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) . In some cases, the first MAC-CE may be Unified TCI States Activation / Deactivation MAC CE without CORESET Pool ID field present. In some cases, if the UE is operating in single-TRP (S-TRP) mode, the first MAC-CE may be Unified TCI States Activation / Deactivation MAC CE without CORESET Pool ID field present.
[0054] In some embodiments, if the number of TCI states activated / indicated by the first MAC-CE is larger 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 embodiments, 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) .
[0055] In some embodiments, if the number of TCI states activated / indicated by the first MAC-CE is two, and / or if the two TCI states activated / indicated by the first MAC-CE are associated with different TRP identifiers or applicable for different TRPs, 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) .
[0056] In some embodiments, 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 following:
[0057] ● one or more joint TCI states, some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier) ;
[0058] ● one or more DL TCI states, some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier) ;
[0059] ● one or more UL TCI states, some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier) ; or
[0060] ● one or more DL TCI states and one or more UL TCI states, where some could be TCI states associated with the first TRP (identifier) , the other could be TCI states associated with the second TRP (identifier) .
[0061] In some cases, the number of joint TCI states indicated in a TCI codepoint by the NE may be up to 4. In some cases, the number of DL TCI states indicated in a TCI codepoint by the NE may be up to 4. In some cases, the number of UL TCI states indicated in a TCI codepoint by the NE may be up to 4.
[0062] For example, one of the following states may be mapped to a TCI codepoint:
[0063] ● one joint TCI state associated with the first TRP (identifier) , the other one joint TCI state associated with the second TRP (identifier) ,
[0064] ● one DL TCI state associated with the first TRP (identifier) , one UL TCI state associated with the second TRP (identifier) ,
[0065] ● one DL TCI state associated with the first TRP (identifier) , the other one DL TCI state associated with the second TRP (identifier) ,
[0066] ● one UL TCI state associated with the first TRP (identifier) , the other one UL TCI state associated with the second TRP (identifier) ,
[0067] ● 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) ,
[0068] ● 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) , and
[0069] ● one DL TCI state and one UL TCI state associated with the first TRP (identifier) , one ULTCI state associated with the second TRP (identifier) .
[0070] In another embodiment, the beam indication may be achieved by DCI signaling. For example, a first DCI may be used to indicate one or more activated unified TCI states and a first acknowledgement signal could be used for indicating Hybrid Automatic Repeat reQuest (HARQ) -acknowledgement (ACK) for legacy beam indication by DCI signaling.
[0071] In some embodiments, 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 NE, 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.
[0072] Thus, in one embodiment, it is possible to use the first application time period and the first slot. In this embodiment, 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 bandwidth part (BWP) with the smallest subcarrier spacing (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 expressed 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.
[0073] In one embodiment, the beam indication is achieved by MAC-CE. A second acknowledgement signal could be used for indicating HARQ-ACK for legacy beam indication by MAC-CE. In this embodiment, 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 a 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 performing subsequent DL and / or UL transmission. In response to receiving the first MAC-CE, the UE may transmit, to the NE, 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.
[0074] In one embodiment, a second application time period and a second slot may be used. In some cases, the second slot may be the earliest slot that is positioned after 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 given by 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.
[0075] For a M-TRP single-DCI (S-DCI) mode, the NE indicates the first and the second joint / DL / UL TCI states to the UE. In some embodiments, the NE 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 embodiments, the NE 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 one TCI field codepoint including a joint / DL / UL TCI state and / or another one joint / DL / UL TCI state. In some cases, the first MAC-CE may be one of Enhanced Unified TCI States Activation / Deactivation MAC CE for Joint TCI States or Enhanced Unified TCI States Activation / Deactivation MAC CE for Separate TCI States. In some cases, if the UE is operating in the M-TRP S-DCI mode, the first MAC-CE may be one of Enhanced Unified TCI States Activation / Deactivation MAC CE for Joint TCI States or Enhanced Unified TCI States Activation / Deactivation MAC CE for Separate TCI States.
[0076] For a M-TRP multiple-DCI (M-DCI) mode, the NE indicates the first and the second joint / DL / UL TCI states to the UE. In some embodiments, the NE may transmit a second DCI to indicate a first joint / DL / UL TCI state, e.g., by TCI field in the DCI. In some embodiments, the NE may transmit a third DCI to indicate a second joint / DL / UL TCI state, e.g., by TCI field in the DCI. In some cases, the first joint / DL / UL TCI state may be from the one or more TCI states activated by a second MAC-CE. In some cases, the second joint / DL / UL TCI state may be from the one or more TCI states activated by a third MAC-CE.In some other embodiments, the NE may transmit a MAC-CE (e.g., the second MAC-CE) to indicate a first joint / DL / UL TCI state to the UE, i.e., activation of only a joint / DL / UL TCI state. In some other embodiments, the NE may transmit a MAC-CE (e.g., the third MAC-CE) to indicate a second joint / DL / UL TCI state to the UE, i.e., activation of only a joint / DL / UL TCI state. In some cases, the second MAC-CE may indicate a TRP identifier (value) , e.g., coresetPoolIndex #0. In some cases, the third MAC-CE may indicate a TRP identifier (value) , e.g., coresetPoolIndex #1. In some cases, the second MAC-CE and the third MAC-CE may be the same type of MAC-CE, e.g., Unified TCI States Activation / Deactivation MAC CE with CORESET Pool ID field present. In some cases, the second MAC-CE may be a Unified TCI States Activation / Deactivation MAC CE with CORESET Pool ID field indicating that the activated TCI states are specified to CORESET pool ID equal to 0. In some cases, the third MAC-CE may be a Unified TCI States Activation / Deactivation MAC CE with CORESET Pool ID field indicating that the activated TCI states are specified to CORESET pool ID equal to 1. In some cases, the UE may receive or detect the second DCI on a CORESET associated with or specific to the first TRP identifier (value) , e.g., coresetPoolIndex #0. In some cases, the UE may receive or detect the third DCI on a CORESET associated with, or specific to the second TRP identifier (value) , e.g., coresetPoolIndex #1.
[0077] In some embodiments, the TCI activation procedure performed via the second MAC-CE and / or the third MAC-CE may be the same as that of the first MAC-CE. In some embodiments, the TCI indication procedure performed via the second DCI and / or the third DCI may be the same as that of the first DCI. In some embodiments, MAC-CE format of the second MAC-CE and / or the third MAC-CE may be the same as that of the first MAC-CE. In some embodiments, a DCI format of the second DCI and / or the third DCI may be the same as that of the first DCI.
[0078] In some embodiments, the first joint / DL TCI state may be associated with or specific to a first TRP or a first TRP identifier (value) , e.g., coresetPoolIndex #0. In some embodiments, the second joint / DL TCI state may be associated with or specific to a second TRP or a second TRP identifier (value) , e.g., coresetPoolIndex #1.
[0079] Two TRP-based transmission scenarios (called in the following the first and second scenarios) are now discussed with regard to the wireless communication system 100. These scenarios are related to performing beam indication and pathloss determination when involving two TRPs, where one of them only serves an UL transmission.
[0080] The first scenario is schematically illustrated in FIG. 3. This figure shows two TRPs 107-i and 107-j through which the first BS 104 communicates with the UE 102. In this scenario, DL transmission 310 (e.g., PDCCH, PDSCH, CSI-RS) and optionally UL transmission 320 (only SRS transmission for antenna switching (AS) ) are supported from / toward the first TRP 107-i, and only an UL transmission 330 (e.g., PUCCH, PUSCH, SRS for codebook (CB) , non-codebook (NCB) , beam management (BM) , and / or AS) is supported toward the second TRP 107-j. Note that in this embodiment, the UL transmission 320 is restricted, i.e., no PUCCH or PUSCH is allowed. Also note that the two TRPs may belong to different base stations, i.e., the two TRPs may be TRP 107-i and TRP 108-j based on the notations of FIG. 1. In other words, the first scenario is applicable to any two TRPs that are simultaneously accessible by a single UE. Regarding a random access (RA) procedure, in the example shown in FIG. 3, the UE may transmit PRACH to the first TRP and / or the second TRP. Thus, the only UL transmission 320 to the first TRP 107-i may be SRS transmission for AS and / or PRACH. The second TRP 107-j may only serve UL transmission 330 from the UE to the NE.
[0081] A signal diagram illustrating the signal exchanges between the UE and NE for the first scenario of FIG. 3 is shown in FIG. 4. According to this figure, in method 400, the UE 102 could optionally transmit or report 410 UE capability (s) for supporting the first scenario (i.e., one TRP only serves a UL transmission and no DL transmission) , and / or a pathloss offset configuration / indication. The UE 102 could also transmit or report 410 UE capability (s) to the first BS 104 (or NE 104) through CN. In the first scenario, the UE 102 may only receive a DL transmission from the first TRP (e.g., TRP 107-1 when i=1) , but not from the second TRP (e.g., TRP 107-2 when j=2) . In the first scenario, the UE 102 may only transmit SRS transmission for AS to the first TRP 107-i, and / or the UE 102 may transmit PUSCH, PUCCH, SRS, and PRACH to the second TRP 107-j. Then, the first BS 104 may transmit an RRC configuration (s) 420 to the UE for configuring one or more joint / DL / UL TCI state (s) , the first scenario, and / or a pathloss offset. Optionally, the BS 104 may transmit 430 a pathloss offset indication or update to indicate a pathloss offset or to update a preconfigured pathloss offset. Afterward, the BS 104 may transmit 440 a pathloss RS for the first scenario from a configuration or from a configured joint / DL / UL TCI state. The BS 104 may transmit 450 a MAC-CE (s) (e.g., as defined in 3GPP Technical Specification (TS) 38.321, Release 17, referred to as a Rel-17 MAC-CE) activating a number of joint / DL / UL TCI state (s) from the configured joint / DL / UL TCI state (s) . Optionally, the first BS 104 may transmit 460 DCI (s) indicating one joint / DL / UL TCI state from the activated joint / DL / UL TCI state (s) . In some embodiments, there could be some restrictions on the TCI state configuration (s) / activation (s) / indication (s) for the first UL-only TRP scenario, when the first BS 104 transmits 420, 440, or 460. For example, the first BS 104 is not allowed to configure / activate / indicate a joint TCI state for the first scenario. More details about this restriction are discussed later. Optionally, the first BS 104 may transmit a scheduling / triggering signal 470 for an UL transmission. In step 480, the UE 102, for determining the UL transmit power, may determine / calculate a pathloss based on the configured / indicated pathloss offset, and / or a pathloss RS configured by the BS or determined by the UE. UE 102 may transmit a preconfigured or the scheduled / triggered UL transmission 490 based on the activated / indicated joint / UL TCI state (s) and the determined UL transmit power.
[0082] More details about the first scenario are now presented. The first scenario may be characterized as a S-TRP-like scenario (which may use the Rel-17 unified TCI framework) , where the DL transmission 310 (PDCCH, PDSCH, CSI-RS) and UL transmission 320 of SRS transmission for AS is from / toward the first TRP 107-i, and the UL transmission 330 (PUCCH, PUSCH, SRS for CB / NCB / BM / AS) is toward the second TRP 107-j.
[0083] In some embodiments, if at least one or a combination of the following events occurs or is achieved, it means or implies that the UE is operating in the first scenario in a serving cell or BWP:
[0084] ● the UE receives, from the NE, configuration (s) of the first scenario for the serving cell or BWP, and / or
[0085] ● the UE receives, from the NE, an activation / deactivation MAC-CE based on Rel-17 unified TCI framework for the serving cell or BWP (e.g., Unified TCI States Activation / Deactivation MAC CE without CORESET Pool ID field present, e.g., MAC CE based on extended logical channel identifier (eLCID) equals to 297) . In such condition, the first MAC-CE may be an activation / deactivation MAC-CE based on Rel-17 unified TCI framework (e.g., Unified TCI States Activation / Deactivation MAC CE without CORESET Pool ID field present) , and / or
[0086] ● the UE receives, from the NE, configuration (s) of CORESET (s) such that coresetPoolIndex is not configured for any CORESET or only one coresetPoolIndex (value) is configured for any CORESET, and / or
[0087] ● the UE receives, from the NE, configuration (s) of configuring that unified TCI state (s) type is “separate” , e.g., by unifiedTCI-StateType or unifiedTCI-StateRef, and / or
[0088] ● the UE receives, from the NE, configuration (s) for configuring one or more candidate pathloss offset and / or configuration (s) for indicating one pathloss offset, and / or
[0089] ● the UE receives, from the NE, configuration (s) of two or more than two power control (PC) adjustment states for SRS (e.g., twoSRS-PC-AdjustmentStates) , which may be separate from the PC adjustment state (s) for PUSCH, and / or
[0090] ● the UE receives, from the NE, configuration (s) of indicating that PC adjustment state (s) for SRS is separate from those for PUSCH, e.g., srs-PowerControlAdjustmentStates.
[0091] Next, beam indication aspects related to the first scenario are discussed. In some embodiments, the UE may receive indication (s) of one indicated joint / DL / UL TCI state by the first DCI. In some other embodiments, the UE may receive indication (s) of one indicated joint / DL / UL TCI state by the first MAC-CE, where the first MAC-CE only activates one TCI field codepoint mapping to the indicated joint / DL / UL TCI state.
[0092] In some embodiments, the indicated UL TCI state may be only used / applied for transmitting for an UL transmission, if the UL transmission is indicated / configured by the NE to follow / share / apply the indicated UL TCI state for transmission, and if at least one of the following conditions is achieved:
[0093] ● the UL transmission scheduled / triggered by a PDCCH on a CORESET associated with coresetPoolIndex #1 or other second TRP identifier, and / or
[0094] ● the UL transmission is transmitted toward the second TRP, and / or
[0095] ● the UL transmission is associated with coresetPoolIndex #1 or other second TRP identifier, and / or
[0096] ● the UL transmission is indicated / configured by the NE or determined by the UE to apply a pathloss offset.
[0097] Next, a joint TCI state mode is discussed in the context of the first scenario. In some embodiments, a joint TCI state mode cannot be configured for the first scenario. The NE may only configure separate TCI state modes. More specifically, the NE may perform at least one of the following, or the NE may perform at least one of the following in cases that the NE configures / indicates / detects the UE is operating in the first scenario in the serving cell or BWP:
[0098] ● the NE refrains from configuring for the UE, that the first RRC parameter unifiedTCI-StateType indicates “joint” in the serving cell or BWP,
[0099] ● the NE configures for the UE, the first RRC parameter unifiedTCI-StateType, and ensures that the first RRC parameter unifiedTCI-StateType indicates “separate” in the serving cell or BWP,
[0100] ● the NE refrains from configuring for the UE, an RRC parameter unifiedTCI-StateRef indicating a reference serving cell / BWP with the first RRC parameter unifiedTCI-StateType indicating “joint” , and / or
[0101] ● the NE configures for the UE, an RRC parameter unifiedTCI-StateRef indicating a reference serving cell / BWP, and ensures that the first RRC parameter unifiedTCI-StateType for the reference serving cell / BWP indicates “separate” .
[0102] In some embodiments, the UE may not expect at least one of the following to occurs, or the UE may determine that it is an error case, or discard / ignore such configuration (s) if at least one of the following occurs:
[0103] ● the UE receives, from the NE, the first RRC parameter unifiedTCI-StateType indicating “joint” in the serving cell or BWP, and / or
[0104] ● the UE receives, from the NE, an RRC parameter unifiedTCI-StateRef for the serving cell or BWP, where the RRC parameter unifiedTCI-StateRef indicates a reference serving cell / BWP with the first RRC parameter unifiedTCI-StateType indicating “joint” .
[0105] In some embodiments, the UE may receive, from the NE, configuration (s) of one or more SRS resource set (s) for AS, e.g., SRS resource set (s) with the RRC parameter usage configured as ‘antennaSwitching’ .
[0106] In some embodiments, if the UE is operating in the first scenario, and / or if the one or more SRS resource set (s) for AS is scheduled / triggered by a PDCCH on a CORESET associated with coresetPoolIndex #0 or other first TRP identifier, or is transmitted toward the first TRP or associated with coresetPoolIndex #0 or other first TRP identifier, or is indicated / configured by the NE or determined by the UE not to apply a pathloss offset, one of the followings may occur:
[0107] ● the NE may refrain from configuring the one or more SRS resource set (s) for AS to follow / share / apply the indicated UL TCI state for transmission, and / or
[0108] ● the NE may configure the one or more SRS resource set (s) for AS to follow / share / apply the indicated DL TCI state for transmission, and / or
[0109] ● the NE may indicate another DL / UL TCI state for an SRS resource in an SRS resource set for AS by RRC signaling, MAC CE (e.g., a dedicated MAC CE for SRS TCI indication / activation) or DCI if the NE does not configure the SRS resource set for AS to follow / share / apply the indicated UL or DL TCI state for transmission, and in such case, (1) the another DL / UL TCI state indicated for SRS may be selected from the same configured DL / UL TCI list as that of the indicated DL / UL TCI state, and / or (2) the another DL / UL TCI state indicated for SRS may be the same or different from the indicated DL / UL TCI state, and / or (3) the another UL TCI state indicated for SRS shall be configured with a pathloss RS by the NE, and / or
[0110] ● the UE may refrain from applying the indicated UL TCI state to transmit the one or more SRS resource set (s) for AS, and / or
[0111] ● the UE may apply the indicated DL TCI state to transmit the one or more SRS resource set (s) for AS, and in such case, (1) the UE derives UL transmission filters or spatial relation via the QCL source RS in the indicated DL TCI state, and / or (2) the UE determines the QCL source RS in the indicated DL TCI state as the pathloss RS, and / or determines pathloss for UL PC via the QCL source RS in the indicated DL TCI state.
[0112] In another embodiment, the SRS for AS is not transmitted toward the first TRP. For this case, if the UE is operating in the first scenario, the UE may not expect at least one of the following events to occur or may determine it is error case or may discard / ignore such configuration (s) / indication (s) , if at least one of the following occurs:
[0113] ● the UE receives, from the NE, configuration (s) / indication (s) to transmit the one or more SRS resource set (s) for AS toward the first TRP, and / or
[0114] ● the UE receives, from the NE, configuration (s) / indication (s) to indicate that the one or more SRS resource set (s) for AS is associated with the first TRP or the first TRP identifier, e.g., by RRC configuration or by transmitting a CORESET associated with the first TRP or the first TRP identifier, to schedule / trigger the one or more SRS resource set (s) for AS, and / or
[0115] ● the UE receives, from the NE, configuration (s) / indication (s) to not apply a pathloss offset for the one or more SRS resource set (s) for AS.
[0116] In some other embodiments, if the NE configures / indicates / detects the UE is operating in the first scenario, the NE may refrain from performing one of the following:
[0117] ● the NE configures / indicates the UE to transmit the one or more SRS resource set (s) for AS toward the first TRP, and / or
[0118] ● the NE configures / indicates to the UE that the one or more SRS resource set (s) for AS is associated with the first TRP or the first TRP identifier, e.g., by RRC configuration or by transmitting a CORESET associated with the first TRP or the first TRP identifier, to schedule / trigger the one or more SRS resource set (s) for AS, and / or
[0119] ● the NE configures / indicates to the UE to not apply a pathloss offset for the one or more SRS resource set (s) for AS.
[0120] In another embodiment, the SRS for non-codebook (NCB) toward the second TRP is not configured with associated channel state information-resource signal (CSI-RS) . For this embodiment, the UE may receive, from the NE, configuration (s) of one or more SRS resource set (s) for NCB UL transmission in a serving cell or BWP, e.g., SRS resource set (s) with the RRC parameter usage configured as ‘nonCodebook’ .
[0121] In some embodiments,
[0122] ● if the UE is operating in the first scenario in the serving cell or BWP, and / or
[0123] ● if the NE configures / indicates / detects the UE is operating in the first scenario in the serving cell or BWP, and / or
[0124] ● if the one or more SRS resource set (s) for NCB UL is scheduled / triggered by a PDCCH on a CORESET associated with coresetPoolIndex #1 or other second TRP identifier, and / or
[0125] ● if the one or more SRS resource set (s) for NCB UL is transmitted toward the second TRP, and / or
[0126] ● if the one or more SRS resource set (s) for NCB UL is associated with coresetPoolIndex #1 or the second TRP identifier, and / or
[0127] ● if the one or more SRS resource set (s) for NCB UL is indicated / configured by the NE or determined by the UE to apply a pathloss offset,
[0128] then, the NE or the UE may perform one of the following:
[0129] ● the NE may refrain from configuring a CSI-RS to be associated with the one or more SRS resource set (s) for NCB UL, and / or
[0130] ● the UE may not expect the following or the UE may determine it is an error case, or discard / ignore such configuration (s) , if the UE is configured by the NE to receive a CSI-RS, which is associated with the one or more SRS resource set (s) for NCB UL.
[0131] According to the next embodiments, how the UE acquires UL PC parameters (p0, alpha, CL index) for SRS to the first TRP if using the DL indicated TCI to derive the UL beam or UL transmission filters is now described. In one embodiment, the UE may use a first set of UL PC parameter (s) .
[0132] In some embodiments, the NE transmits, to the UE, a first set of UL PC parameter (s) for a serving cell or BWP. In some cases, the first set of UL PC parameter (s) may comprise one of a UL PC ID, a parameter set for PUSCH, a parameter set for PUCCH, and / or a parameter set for SRS. In some cases, a parameter set for PUSCH / PUCCH / SRS may include at least one of the followings: p0, alpha value, and a closed loop index.
[0133] In other embodiments, the NE may transmit, to the UE, a second set of UL PC parameter (s) . In some cases, the second set of UL PC parameter (s) may include one of a UL PC ID, or a parameter set for SRS. In some cases, the second set of UL PC parameter (s) may not include a parameter set for PUSCH or a parameter set for PUCCH. In some cases, a parameter set for PUSCH / PUCCH / SRS may include at least one of the followings: p0, alpha value, and a closed loop index.
[0134] In some embodiments, if one or more of the following conditions is true:
[0135] ● the UE transmits a UL transmission in the serving cell or BWP, where the UL transmission is indicated / configured by the NE to apply / use the indicated UL TCI state to transmit, and / or
[0136] ● the indicated UL TCI state is not configured with UL PC parameter (s) by the NE, and / or
[0137] ● the UE is operating in the first scenario, and / or
[0138] ● the UL transmission is indicated / configured by the NE or determined by the UE to apply a pathloss offset,
[0139] then, the UE may determine a UL transmit power for transmitting the UL transmission via the first set of UL PC parameters (instead of the second set of UL PC parameter (s) ) .
[0140] In some embodiments, if:
[0141] ● the UE is operating in the first scenario, and / or
[0142] ● the UE receives, from the NE, configuration (s) of transmitting one or more SRS (s) associated with coresetPoolIndex #0 or other first TRP identifier, and / or
[0143] ● the UE receives a PDCCH on a CORESET associated with coresetPoolIndex #0 or other first TRP identifier, where the PDCCH schedules / triggers transmission of one or more SRS (s) , and / or
[0144] ● the one or more SRS (s) is not configured by the NE to apply / share / follow the indicated UL TCI state for transmission, and / or
[0145] ● the one or more SRS (s) is indicated / configured by the NE or determined by the UE to not apply a pathloss offset,
[0146] then, the UE performs at least one of the followings for transmitting the one or more SRS(s) :
[0147] ● the UE may determine a UL transmit power via the second set of UL PC parameter (s) , and / or
[0148] ● the UE may determine a UL transmit power via an additional signaling transmitted by the NE.
[0149] In such embodiments, the UE may alternatively determine the UL transmit power via the first set of UL PC parameter (s) .
[0150] Next, determining the pathloss offset and pathloss RS for the first scenario are discussed. For PUSCH, PUCCH, SRS to the second TRP, the pathloss calculation is based on a pathloss RS configured in the indicated UL TCI state or a reference signal in the indicated DL TCI state, and a pathloss offset.
[0151] In some embodiments, the NE may transmit, to the UE, configuration (s) of a pathloss RS for the indicated UL TCI state. In some other embodiments, the NE may refrain from transmitting, to the UE, configuration (s) of the pathloss RS for the indicated UL TCI state. In some cases, if the NE transmits, to the UE, configuration (s) of the pathloss RS for the indicated UL TCI state, the pathloss RS may be transmitted from the first TRP or associated with the first TRP or the first TRP identifier. In some embodiments, the NE may transmit, to the UE, configuration (s) and / or indication (s) of a first pathloss offset for determining / calculating the pathloss when determining the UL transmit power for transmitting a UL transmission via the indicated UL TCI state. In such embodiments, a first pathloss offset may be configured / indicated if the NE configures / indicates / detects the UE is operating in the first scenario in the serving cell or BWP.
[0152] In some embodiments, if the UE is operating in the first scenario, and / or if the UE is indicated to apply / use the indicated UL TCI state to transmit a UL transmission (e.g., PUSCH, PUCCH, SRS) , when determining the UL transmit power for transmitting the UL transmission, the UE may determine / calculate the pathloss based on one or a combination of the following:
[0153] ● the pathloss RS, if configured, for the indicated UL TCI state, and / or
[0154] ● a reference signal (e.g., quasi-located (QCL) Type A / C RS, QCL Type D RS, where QCL Types A, B, C, D are defined in 3GPP TS 38.214) for the indicated DL TCI state, (in such case, the UE may measure the pathloss via the reference signal or determine the reference signal is a pathloss RS for the indicated UL TCI state) , and / or
[0155] ● the first pathloss offset.
[0156] According to another embodiment, pathloss calculation for physical random access channel (PRACH) is based on a pathloss RS and / or the first pathloss offset. More specifically, if the UE is operating in the first scenario, and / or if the UE determines to transmit a PRACH (e.g., for contention based RA (CBRA) or RA procedure triggered by PDCCH order or other type of contention free RA (CFRA) , like CFRA for beam failure recovery (BFR) or system information request) , when determining the UL transmit power for transmitting the PRACH, the UE may determine / calculate a pathloss based on one or a combination of the following:
[0157] ● a SSB or CSI-RS used by the UE to transmit the PRACH, and / or
[0158] ● the first pathloss offset.
[0159] In some embodiments, if the UE is operating in the first scenario, and / or if the UE determines to transmit a PRACH, the UE may determine whether to use the first pathloss offset for determining / calculating pathloss, based on a TRP identifier value (e.g., coresetPoolIndex) associated with the PRACH, and / or a RA configuration (e.g., RACH-ConfigGeneric, RACH-ConfigCommon, or RACH-ConfigDedicated) from the NE. In some cases, the UE may determine to use the first pathloss offset and the used SSB / CSI-RS for determining / calculating the pathloss, if the PRACH is associated with the second TRP identifier (e.g., coresetPoolIndex #1) or if the RA configuration requires the UE to perform in this way. In some cases, the UE may determine to not use the first pathloss offset and only rely on the used SSB / CSI-RS for determining / calculating the pathloss, if the PRACH is associated with the first TRP identifier (e.g., coresetPoolIndex #0) or the RA configuration requires the UE to perform in this way.
[0160] In some embodiments, if the NE configures / indicates / detects that the UE is operating in the first scenario, and / or if the NE transmits, to the UE, RA configuration (s) (e.g., RACH-ConfigGeneric, RACH-ConfigCommon, or RACH-ConfigDedicated) , the NE may configure, for the UE, the first pathloss offset for each SSB or CSI-RS associated with the PRACH via the RA configuration (s) . The NE may transmit or utilize, common or separate configurations for the SSBs / CSI-RSs associated with PRACH. In some embodiments, the NE may configure, for the UE, the first pathloss offset for each PRACH occasion or resource. If the first pathloss offset is not configured by the NE, the UE may determine the first pathloss offset as 0 dB.
[0161] The pathloss offset configuration and indication for PUSCH / PUCCH / SRS and PRACH is now discussed. In some embodiments, the NE may transmit, to the UE, configuration (s) and / or indication (s) of the first pathloss offset based on one of the following options:
[0162] Option 1: RRC configuration (s) to configure / indicate one pathloss offset as the first pathloss offset. For such option, the NE may update the first pathloss offset via RRC reconfiguration, and / or
[0163] Option 2: MAC-CE activation / indication or DCI indication to indicate one pathloss offset as the first pathloss offset. For such option, the NE may transmit configuration (s) of one or more candidate pathloss offset, and then transmit a MAC-CE to activate / indicate or a DCI to indicate one of configured pathloss offset as the first pathloss offset. For option 2, before the NE transmits a MAC-CE to activate / indicate or a DCI to indicate one of configured pathloss offsets, the UE may apply an initial or default pathloss offset configured by the NE as the first pathloss offset. For option 2, the NE may update / change the first pathloss offset via transmitting another one MAC-CE or DCI. For option 2, the NE may transmit the MAC-CE or DCI in unicast manner, e.g., based on cell radio network temporary identifier (C-RNTI) or modulation and coding scheme C-RNTI (MCS-C-RNTI) , or in group-cast manner, e.g., based on an RNTI predefined or configured by the NE. For group-cast based operation, the NE may configure the location / block of the pathloss offset, e.g., the corresponding DCI field in the DCI or MAC CE field in the MAC CE, for the UE and one or more other UE (s) .
[0164] For option 2, the UE may apply the activated / indicated pathloss offset after X symbols or slots or milliseconds after the UE transmits the last symbol of the PUCCH or PUSCH with the acknowledgement corresponding to the MAC CE or DCI or after the UE receives the last symbol of the PDSCH with the MAC CE or the PDCCH with the DCI. The NE may configure or indicate a value of X to the UE.
[0165] For option 2, the UE may determine or calculate the first pathloss offset based on cumulative or absolute manner. For cumulative manner, the UE may determine the first pathloss offset based on the current first pathloss offset and the activated / indicated pathloss offset, e.g., current first pathloss offset plus the activated / indicated pathloss offset. For the absolute manner, the UE may determine the first pathloss offset by replacing a current first pathloss offset by the activated / indicated pathloss offset. The NE may configure, for the UE, whether the first pathloss offset is indicated / determine in an accumulative or absolute manner.
[0166] In such embodiments, for option 1 and / or option 2 discussed above, the NE may configure, for the UE, the pathloss offset indicated by the RRC configuration (s) , MAC-CE, or DCI (e.g., the first pathloss offset) is per configured TCI state, per activated TCI state, per indicated TCI state, per TCI state group, per UL channel / RS, per UL resource, per UL resource group (e.g., PUCCH resource group) , per configured UL grant, per (configured) pathloss reference signal, per pathloss reference signal group, per SSB, per bandwidth part, or per serving cell.
[0167] In some embodiments, if the first pathloss offset is not configured / indicated to the UE by the NE, the UE may determine the value of the first pathloss offset is 0dB. In one example, the NE may configure multiple pathloss offsets, and configure the first pathloss offset by indicating the pathloss offset index associated with or configured in a TCI state or pathloss reference signal.
[0168] In another embodiment, pathloss RS indications and / or another way of pathloss offset indication may be used, for example, for CFRA triggered by PDCCH order. More specifically, in some embodiments, if the UE is operating in the first scenario, and / or if the UE receives a PDCCH order indicating / triggering the UE to perform a PRACH transmission, the PDCCH order may indicate at least one of the followings:
[0169] ● a SSB index, and in such a case, the SSB index may be used as a pathloss RS for determining / calculating pathloss when determining UL transmit power,
[0170] ● a first pathloss offset and in such case, the first pathloss offset may be used for determining / calculating pathloss when determining UL transmit power, and / or, for this case, the UE may determine / calculate the pathloss via the indicated first pathloss offset plus indicated SSB index, or via the indicated first pathloss offset plus the QCL source RS for the indicated DL TCI state for receiving the CORESET where the PDCCH order is transmitted, and / or
[0171] ● a DCI field, and in such a case, if the DCI field is present, the DCI field may indicate how to derive the pathloss for transmitting the indicated / triggered PRACH transmission. The DCI field may indicate the UE to derive pathloss based on the QCL source RS for the indicated DL TCI state for receiving the CORESET where the PDCCH order is transmitted. The DCI field may indicate the UE to derive pathloss based on indicated SSB index and / or the indicated first pathloss offset in the PDCCH order. For this case, the DCI field may be present in the PDCCH order, even if the NE does not transmit to the UE configuration (s) of enabling two TAGs for a serving cell (e.g., tag-Id2) and / or inter-cell M-TRP feature (e.g., SSB-MTC-AddtionalPCI) .
[0172] In a different embodiment, the UE requests the pathloss offset configuration / indication from the NE in an UE-initiated manner. More specifically, the UE may transmit a signal to trigger / request the NE to transmit RRC configuration (s) or MAC-CE activation / indication or DCI indication to indicate / update the first pathloss offset. In some embodiments, if the UE is operating in the first scenario, the UE may transmit a signal to trigger / request the NE to transmit RRC configuration (s) or MAC-CE activation / indication or DCI indication to indicate / update the first pathloss offset. The UE may transmit the signal by uplink control information (UCI) on PUCCH or PUSCH, or by MAC-CE on PUSCH. A prohibit timer may be predefined or configured by the NE. The UE may start or restart / reset the prohibit timer after reception of the first pathloss offset update signaling. It may trigger the procedure to request the first pathloss offset after / if the prohibit timer expires.
[0173] In some embodiments, if the supplementary UL (SUL) is configured, the NE may configure the first pathloss offset for normal or non-supplementary UL (NUL) and the first pathloss offset for SUL. In some embodiments, if the UE is operating in the first scenario in a serving cell or BWP, and / or if the UE receives, from the NE, configuration (s) of SUL for the serving cell ow BWP, the UE may receive, from the NE, configuration (s) / indication (s) of the first pathloss offset for a NUL in the serving cell or BWP and / or the first pathloss offset for a SUL in the serving cell or BWP. This implies that the NE may separately configure / indicate / update the first pathloss offset for NUL and that for SUL.
[0174] In some embodiments, the UE may determine whether to apply the first pathloss offset for NUL or SUL for an UL transmission, based on whether the UL transmission is transmitted on a NUL or SUL. In some embodiments, if the UE is operating in the first scenario in a serving cell or BWP, and / or if the UE receives, from the NE, configuration (s) of SUL for the serving cell or BWP, when determining UL transmit power for transmitting a UL transmission (e.g., PUSCH, PUCCH, SRS, or PRACH) , the UE may determine / calculate the pathloss, based on whether the UL transmission is configured / indicated by the NE to transmit on a NUL or SUL in the serving cell or BWP. In some cases, if the UL transmission is configured / indicated to take place on a NUL, and the UE determines or is indicated / configured by the NE to apply the first pathloss offset for the UL transmission, the UE apply the first pathloss offset for the NUL. In some cases, if the UL transmission is configured / indicated to transmit on a SUL, and the UE determines or is indicated / configured by the NE to apply the first pathloss offset for the UL transmission, the UE applies the first pathloss offset for the SUL.
[0175] In one embodiment, the UE reports a capability on whether to support pathloss offset configuration / indication. More specifically, the UE may transmit, to the NE, a UE capability report to indicate whether the UE supports determining / calculating a pathloss based on a first pathloss offset.
[0176] In some embodiments, if the NE configures / indicates / detects the UE is operating in the first scenario, and / or if the UE supports determining / calculating pathloss based on a first pathloss offset, the NE may transmit configuration (s) to enable the UE to determine / calculate pathloss based on a configured / activated / indicated first pathloss offset. In some embodiments, if the UE does not support determining / calculating pathloss based on a first pathloss offset, the NE shall transmit, to the UE, configuration (s) of a pathloss RS for the indicated UL TCI state, where the pathloss RS may be transmitted from the second TRP or associated with the second TRP or the second TRP identifier (e.g., coresetPoolIndex #1) .
[0177] In another embodiment, a pathloss RS configuration is used or configured for all or some UL beams to reduce UE complexity. In this embodiment, the NE may not configure, for the UE, a pathloss RS for each configured UL TCI state respectively in a serving cell or BWP. In some embodiments, if the NE configures / indicates / detects the UE is operating in the first scenario in a serving cell or BWP, the NE may not configure, for the UE, a pathloss RS for each configured UL TCI state respectively in the serving cell or BWP. In some other embodiments, if the NE configures / indicates / detects the UE is operating in the first scenario in a serving cell or BWP, the NE may not or may refrain from configuring, for the UE, a pathloss RS for all configured UL TCI state (s) in the serving cell or BWP.
[0178] In some embodiments, if the NE does not configure, for the UE, a pathloss RS for a configured UL TCI state in a serving cell or BWP, the NE or the UE may perform one of the following options:
[0179] ● for option 1, the NE may configure, for the UE, a first pathloss RS (per serving cell or per BWP) for the serving cell or BWP. For such option, the UE may use the first pathloss RS for determining / calculating pathloss when determining the UL transmit power for transmitting a UL transmission via a UL TCI state without a configured pathloss RS. For such option, the first pathloss RS may be commonly used by the UE for all configured UL TCI state (s) without a configured pathloss RS.
[0180] ● for option 2, the UE may use a reference signal (e.g., QCL TypeA / C RS, QCL TypeD RS) for the indicated DL TCI state for determining / calculating a pathloss when determining the UL transmit power for transmitting a UL transmission via a UL TCI state without a configured pathloss RS.
[0181] A method in which the NE configures the UE for implementing one or more of the embodiments discussed above, for the first scenario illustrated in FIG. 3, is discussed with regard to FIG. 5. The method 500 includes receiving 520 at the UE, from the NE, a control signal configuring: one or more joint or downlink or uplink, joint / DL / UL, transmission configuration indicator, TCI, states, and a corresponding pathloss offset, for downlink operation in a single transmission reception mode and for uplink operation in a multiple transmission reception mode, receiving 550, from the NE, an activation signal for activating one or two joint / DL / UL TCI states from the configured one or more joint / DL / UL TCI states, and transmitting 580 an uplink transmission based on one or more joint or UL, joint / UL, TCI states from the activated one or two joint / UL TCI states, and a transmit power based on the corresponding pathloss offset. Note that for this method, the activated one or two joint / DL / UL TCI states are associated with a DL transmission for the first TRP, and a respective UL transmission for each of the first TRP and a second TRP and the respective UL transmission for the first TRP is restricted to only the SRS transmission for AS. Similar method steps may be implemented at the NE by replacing the term “receiving” with “transmitting” and vice versa.
[0182] A second scenario, which is illustrated in FIG. 6, is now discussed. This scenario is different from the first scenario shown in FIG. 3 because the UL transmission 620 of the first TRP 107-i is not restricted, i.e., the system is M-TRP and uses 3GPP Release18 unified TCI framework, where the DL transmission (PDCCH, PDSCH, and CSI-RS) is from the first TRP and UL transmission (PUSCH, PUCCH, and SRS for CB, NCB, BM, and / or AS) is toward the first TRP, the second TRP, or both TRPs. Regarding an RA procedure, for the example shown in FIG. 6, the UE may transmit PRACH to the first TRP and / or the second TRP and the second TRP may only serve UL transmission from the UE to the NE.
[0183] A signal diagram illustrating the signal exchanges between the UE and NE for the second scenario of FIG. 6 is shown in FIG. 7. According to this figure, in method 700, the UE 102 could optionally transmit or report 712 UE capability (s) for supporting the second scenario (where one TRP only serves UL transmission) , and / or pathloss offset configuration / indication. The UE 102 could also transmit or report 712 UE capability (s) to the first BS 104 through CN. In the second scenario, the UE 102 may only receive DL transmission from a first TRP (e.g., TRP 107-1) , not from the second TRP (e.g., TRP 107-2) . In the second scenario, the UE 102 may transmit PUSCH, PUCCH, SRS, and PRACH to the first TRP, to the second TRP, or to both the first and the second TRPs. The first BS 104 may transmit RRC configuration (s) 722 for configuring one or more joint / DL / UL TCI state (s) , the second scenario, and / or a pathloss offset. The BS 104 may transmit 742 a pathloss RS for the second scenario, from a configuration or from a configured joint / DL / UL TCI state. The first BS 104 could transmit 752 a MAC-CE (s) (e.g., as defined in 3GPP Technical Specification (TS) 38.321, Release 18, referred to as Rel-18) activating a number of joint / DL / UL TCI state (s) from the configured joint / DL / UL TCI state (s) . Optionally, the first BS 104 may transmit 762 DCI (s) indicating one or two joint / DL / UL TCI state (s) from the activated joint / DL / UL TCI state (s) . Steps 430, 470, 480, and 490 are similar to those of the method illustrated in FIG. 4, and thus their description is omitted here.
[0184] The various possible configurations of the system 100 for handling beam indication and pathloss for the second scenario are now disclosed. In some embodiments, if at least one or a combination of the following events occur or is achieved, it means or implies that the UE is operating in a second scenario in a serving cell or BWP:
[0185] ● the UE receives, from the NE, configuration (s) of the second scenario for the serving cell or BWP, and / or
[0186] ● the UE receives, from the NE, an activation / deactivation MAC-CE based on Rel-18 unified TCI framework (e.g., Unified TCI States Activation / Deactivation MAC CE with CORESET Pool ID field present, Enhanced Unified TCI States Activation / Deactivation MAC CE for Joint TCI States or Enhanced Unified TCI States Activation / Deactivation MAC CE for Separate TCI States) . For this condition, the first MAC-CE may be an activation / deactivation MAC-CE based on Rel-18 unified TCI framework (e.g., Unified TCI States Activation / Deactivation MAC CE with CORESET Pool ID field present, Enhanced Unified TCI States Activation / Deactivation MAC CE for Joint TCI States or Enhanced Unified TCI States Activation / Deactivation MAC CE for Separate TCI States) , and / or
[0187] ● the UE receives, from the NE, the first MAC-CE, where all TCI codepoint (s) activated by the first MAC-CE is mapping to only one joint or DL TCI state, and / or
[0188] ● the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to only one joint or DL TCI state, and / or
[0189] ● the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to only one joint or DL TCI state, and / or
[0190] ● the UE receives, from the NE, configuration (s) of one or more candidate pathloss offset and / or configuration (s) of indicating one pathloss offset, and / or
[0191] ● the UE receives, from the NE, configuration (s) of two or more than two PC adjustment states for SRS (e.g., twoSRS-PC-AdjustmentStates) , which may be separate from the PUSCH, and / or
[0192] ● the UE receives, from the NE, configuration (s) indicating that PC adjustment state (s) for SRS is separate from those for PUSCH, e.g., srs-PowerControlAdjustmentStates.
[0193] Regarding the beam indication for the second scenario, S-and M-DCI M-TRP mode may be separately discussed. For beam indication for S-DCI mode, in some embodiments, the UE may receive indication (s) of a first indicated joint / DL / UL TCI state and / or a second indicated joint / DL / UL TCI state by the first DCI. In some other embodiments, the UE may receive indication (s) of a first indicated joint / DL / UL TCI state and / or a second indicated joint / DL / UL TCI state by the first MAC-CE, where the first MAC-CE only activates one TCI field codepoint mapping to the first indicated joint / DL / UL TCI state and / or the second indicated joint / DL / UL TCI state.
[0194] For beam indication for M-DCI mode, in some embodiments, the UE may receive indication (s) of a first indicated joint / DL / UL TCI state by the second DCI. In some other embodiments, the UE may receive indication (s) of a first indicated joint / DL / UL TCI state by the second MAC-CE, where the second MAC-CE only activates one TCI field codepoint mapping to the first indicated joint / DL / UL TCI. In some embodiments, the UE may receive indication (s) of a second indicated joint / DL / UL TCI state by the third DCI. In some other embodiments, the UE may receive indication (s) of a second indicated joint / DL / UL TCI state by the third MAC-CE, where the third MAC-CE only activates one TCI field codepoint mapping to the second indicated joint / DL / UL TCI.
[0195] In some embodiments, only one of the first or the second indicated joint / DL TCI state may be used / applied for receiving a DL transmission that may share / apply indicated joint / DL TCI state (s) , based on configuration (s) / indication (s) from the NE. For example, only the first indicated joint / DL TCI state may be used / applied for receiving a DL transmission that may share / apply the indicated joint / DL TCI state (s) .
[0196] In one embodiment, in the second scenario, both joint and separate TCI state modes may be configured. In some embodiments, the NE may perform at least one of the following actions for the UE, if / when the NE configures / indicates / detects the UE is operating in the second scenario in the serving cell or BWP:
[0197] ● the NE configures the UE with the first RRC parameter unifiedTCI-StateType indicating “joint” or “separate” in the serving cell or BWP, and / or
[0198] ● the NE configures the UE with a RRC parameter unifiedTCI-StateRef indicating a reference serving cell / BWP, where the first RRC parameter unifiedTCI-StateType for the reference serving cell / BWP indicates “joint” or “separate” .
[0199] Alternatively, in one embodiment, the joint TCI state mode cannot be configured for the second scenario and the NE may only configure a separate TCI state mode. In some embodiments, the NE may perform at least one of the followings, or the NE may perform at least one of the followings in cases that the NE configures / indicates / detects that the UE is operating in the second scenario in the serving cell or BWP,
[0200] ● the NE refrains from configuring the UE with the first RRC parameter unifiedTCI-StateType indicating “joint” in the serving cell or BWP,
[0201] ● the NE configures the UE with the first RRC parameter unifiedTCI-StateType, and ensures the first RRC parameter unifiedTCI-StateType indicates “separate” in the serving cell or BWP,
[0202] ● the NE refrains from configuring the UE with an RRC parameter unifiedTCI-StateRef indicating a reference serving cell / BWP with the first RRC parameter unifiedTCI-StateType indicating “joint” ,
[0203] ● the NE configures the UE with an RRC parameter unifiedTCI-StateRef indicating a reference serving cell / BWP and ensures the first RRC parameter unifiedTCI-StateType for the reference serving cell / BWP indicates “separate” .
[0204] In some embodiments, the UE may not expect at least one of the following events to occur, or the UE may determine it is an error case, or the UE discards / ignores such configuration (s) if at least one of the following events occurs:
[0205] ● the UE receives, from the NE, the first RRC parameter unifiedTCI-StateType indicating “joint” in the serving cell or BWP,
[0206] ● the UE receives, from the NE, an RRC parameter unifiedTCI-StateRef for the serving cell or BWP, where the RRC parameter unifiedTCI-StateRef indicates a reference serving cell / BWP with the first RRC parameter unifiedTCI-StateType indicating “joint” .
[0207] In some embodiments, the NE may perform at least one of the following actions, if the NE transmits, to the UE, configuration (s) indicating that a configuration of the unified TCI state (s) type is “separate” in a serving cell or BWP (e.g., via unifiedTCI-StateType or unifiedTCI-StateRef) and / or if the NE configures / indicates / detects the UE is operating in the second scenario in the serving cell or BWP:
[0208] ● the NE refrains from transmitting to the UE, the first MAC-CE activating at least one TCI codepoint mapping to two DL TCI state (s) , and / or
[0209] ● the NE refrains from transmitting to the UE, the first MAC-CE activating only one TCI codepoint, which is mapping to two DL TCI state (s) , and / or
[0210] ● the NE refrains from transmitting to the UE, the first DCI indicating a TCI codepoint mapping to two DL TCI state (s) , and / or
[0211] ● the NE refrains from transmitting to the UE, the third MAC-CE activating at least one TCI codepoint mapping to a DL TCI state, and / or
[0212] ● the NE refrains from transmitting to the UE, the third MAC-CE activating only one TCI codepoint, which is mapping to at least a DL TCI state, and / or
[0213] ● the NE refrains from transmitting to the UE, the third DCI indicating a TCI codepoint mapping to at least a DL TCI state.
[0214] In some embodiments, if the UE receives, from the NE, configuration (s) indicating that a configuration of the unified TCI state (s) type is “separate” in a serving cell or BWP (e.g., via unifiedTCI-StateType or unifiedTCI-StateRef) and / or if the UE is operating in the second scenario in the serving cell or BWP, the UE may not expect at least one of the following acts to occur, or the UE may determine it is an error case, or the UE may discard / ignore such activation (s) / indication (s) if at least one of the following acts occurs:
[0215] ● the UE receives, from the NE, the first MAC-CE activating at least one TCI codepoint mapping to two DL TCI state (s) , and / or
[0216] ● the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to two DL TCI state (s) , and / or
[0217] ● the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to two DL TCI state (s) , and / or
[0218] ● the UE receives, from the NE, the third MAC-CE activating at least one TCI codepoint mapping to a DL TCI state, and / or
[0219] ● the UE receives, from the NE, the third MAC-CE activating only one TCI codepoint, which is mapping to at least a DL TCI state, and / or
[0220] ● the UE receives, from the NE, the third DCI indicating a TCI codepoint mapping to at least a DL TCI state.
[0221] In another embodiment, for S-DCI mode, for joint and separate TCI state mode, if two joint / DL TCIs may be activated / indicated / applied, the NE cannot configure TCI selection field or NE only configures / indicates UE to apply one indicated joint / DL TCI. For a separate TCI state mode, if two DL TCIs may be activated / indicated / applied, the NE may indicate two identical DL TCIs.
[0222] More specifically, in some embodiments, if:
[0223] ● the NE configures / indicates / detects that the UE is operating in the second scenario in the serving cell or BWP, and / or
[0224] ● the NE transmits, to the UE, the first MAC-CE activating at least one TCI codepoint mapping to two joint or DL TCI state (s) , and / or
[0225] ● the NE transmits, to the UE, the first MAC-CE activating only one TCI codepoint, which is mapping to two joint or DL TCI state (s) , and / or
[0226] ● the NE transmits, to the UE, the first DCI indicating a TCI codepoint mapping to two joint or DL TCI state (s) ,
[0227] then, the NE may perform at least one act described in the following cases:
[0228] ● for case 1, the NE shall configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use one or the same indicated joint / DL TCI state (either the first or the second) for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0229] ● for case 2, the NE shall configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the first indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0230] ● for case 3, the NE shall configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the second indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0231] ● for case 4, the NE shall instruct the UE to apply / use the first indicated joint / DL TCI state for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., always indicating “00” in TCI selection field, if configured) , and / or
[0232] ● for case 5, the NE shall instruct the UE to apply / use the second indicated joint / DL TCI state for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., always indicating “01” in TCI selection field, if configured) , and / or
[0233] ● for case 6, the NE refrains from transmitting, to the UE, configuration (s) of presence of a TCI selection field in a DCI format 1_1 / 1_2, and / or
[0234] ● for case 7, if the NE transmits, to the UE, the first MAC-CE activating at least one TCI codepoint mapping to at least two DL TCI states, the NE ensures that the two DL TCI states are identical, and / or
[0235] ● for case 8, if the NE transmits to the UE the first MAC-CE activating only one TCI codepoint, which is mapping to at least two joint or DL TCI states, the NE ensures that the two DL TCI states are identical, and / or
[0236] ● for case 9, if the NE transmits to the UE the first DCI indicating a TCI codepoint mapping to at least two DL TCI states, the NE ensures that the two DL TCI states are identical.
[0237] In some embodiments, if:
[0238] ● or when the UE is operating in the second scenario in the serving cell or BWP, and / or
[0239] ● the UE receives, from the NE, the first MAC-CE activating at least one TCI codepoint mapping to two joint or DL TCI state (s) , and / or
[0240] ● the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to two joint or DL TCI state (s) , and / or
[0241] ● the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to two joint or DL TCI state (s) ,
[0242] then, the UE may expect at least one of the following acts to occur, if at least one of the following cases occurs:
[0243] ● for case 1, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use one or the same indicated joint / DL TCI state (either the first or the second) for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0244] ● for case 2, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the first indicated joint / DL TCI state for all receiving DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0245] ● for case 3, the UE receives configuration (s) , from the NE, to configure or indicate (e.g., via applyIndicatedTCI-State) the UE to apply / use the second indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0246] ● for case 4, the UE receives indication (s) , from the NE, to apply / use the first indicated joint / DL TCI state (s) for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., indicating value “00” in TCI selection field, if configured) , and / or
[0247] ● for case 5, the UE receives indication (s) , from the NE, to apply / use the second indicated joint / DL TCI state (s) for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., indicating value “01” in TCI selection field, if configured) , and / or
[0248] ● for case 6, the UE receives, from the NE, configuration (s) of presence of a TCI selection field in a DCI format 1_1 / 1_2, and / or
[0249] ● for case 7, if the UE receives, from the NE, the first MAC-CE activating at least one TCI codepoint mapping to two DL TCI states, the two DL TCI states are identical, and / or
[0250] ● for case 8, if the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to at least two DL TCI state, the two DL TCI states are identical, and / or
[0251] ● for case 9, if the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to at least two DL TCI state, the two DL TCI states are identical.
[0252] In some embodiments, if:
[0253] ● or when the UE is operating in the second scenario in the serving cell or BWP, and / or
[0254] ● the UE receives, from the NE, the first MAC-CE activating at least one TCI codepoint mapping to two DL TCI states, and / or
[0255] ● the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to two DL TCI states, and / or
[0256] ● the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to two DL TCI states,
[0257] then, the UE may not expect at least one of the following acts to occur, or the UE may determine it is an error case, or the UE may discard / ignore such activation (s) / indication (s) , if at least one of the following cases occurs, or the UE may report a UE capability indicating whether the UE supports at least one of the following cases:
[0258] ● for case 1, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the second (or both the first and the second) indicated joint / DL TCI state for all receiving DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0259] ● for case 2, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the first (or both the first and the second) indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply the indicated joint / DL TCI state (s) , and / or
[0260] ● for case 3, the UE receives indication (s) , from the NE, to apply / use the second (or both the first and the second) indicated joint / DL TCI state (s) for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., indicating value “01” or “10” in TCI selection field, if configured) , and / or
[0261] ● for case 4, the UE receives indication (s) , from the NE, to apply / use the first (or both the first and the second) indicated joint / DL TCI state (s) for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., indicating value “00” or “10” in TCI selection field, if configured) , and / or
[0262] ● for case 5, the UE receives, from the NE, configuration (s) of presence of a TCI selection field in a DCI format 1_1 / 1_2, and / or
[0263] ● for case 6, if the UE receives, from the NE, the first MAC-CE activating at least one TCI codepoint mapping to two DL TCI states, the two DL TCI states are different and / or
[0264] ● for case 7, if the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to two DL TCI states, the two DL TCI states are different, and / or
[0265] ● for case 8, if the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to two DL TCI states, the two DL TCI states are different.
[0266] In some embodiments, if / when the UE is operating in the second scenario in the serving cell or BWP, the UE may only apply / use one specific (indicated) joint / DL TCI state (e.g., the first indicated joint / DL TCI state) for receiving a DL channel / RS that may share / apply indicated joint / DL TCI state (s) or receiving PDSCH scheduled by DCI format 1_1 / 1_2, then one or a combination of the following case (s) occurs:
[0267] ● for case 1, the UE receives, from the NE, the first MAC-CE activating at least one TCI codepoint mapping to two joint or DL TCI state (s) , and / or
[0268] ● for case 2, the UE receives, from the NE, the first MAC-CE activating only one TCI codepoint, which is mapping to two joint or DL TCI state (s) , and / or
[0269] ● for case 3, the UE receives, from the NE, the first DCI indicating a TCI codepoint mapping to two joint or DL TCI state (s) , and / or
[0270] ● for case 4, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use both the first and the second indicated joint / DL TCI state for receiving the DL channel / RS that may share / apply indicated joint / DL TCI state (s) , and / or
[0271] ● for case 5, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use an indicated joint / DL TCI state different from the specific indicated joint / DL TCI state for receiving the DL channel / RS that may share / apply indicated joint / DL TCI state (s) , and / or
[0272] ● for case 6, the UE receives indication (s) , from the NE, to apply / use both the first and the second indicated joint / DL TCI state (s) for receiving PDSCH scheduled by DCI format 1_1 / 1_2 (e.g., indicating value “01” or “10” in TCI selection field, if configured) , and / or
[0273] ● for case 7, the UE receives indication (s) , from the NE, to apply / use an indicated joint / DL TCI state, different from the specific indicated joint / DL TCI state for receiving PDSCH scheduled by DCI format 1_1 / 1_2, and / or
[0274] ● for case 8, the UE receives, from the NE, configuration (s) of presence of a TCI selection field in a DCI format 1_1 / 1_2.
[0275] For the M-DCI mode, for joint and separate TCI state modes, if two joint / DL TCIs may be activated / indicated / applied, the NE only configures / indicates to the UE to apply one indicated joint / DL TCI. For the separate TCI state mode, if DL TCI may be activated / indicated / applied for both TRPs, the NE may indicate two identical DL TCIs.
[0276] In some embodiments, if:
[0277] ● the NE configures / indicates / detects that the UE is operating in the second scenario in the serving cell or BWP, and / or
[0278] ● the NE transmits, to the UE, the third MAC-CE activating at least one TCI codepoint mapping to a joint / DL TCI state, and / or
[0279] ● the NE transmits, to the UE, the third MAC-CE activating only one TCI codepoint, which is mapping to at least a joint / DL TCI state, and / or
[0280] ● the NE transmits, to the UE, the third DCI indicating a TCI codepoint mapping to at least a joint / DL TCI state,
[0281] then, the NE may perform at least one of the actions described in the following cases:
[0282] ● for case 1, the NE shall configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use one or the same indicated joint / DL TCI state (either the first or the second) for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0283] ● for case 2, the NE shall configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the first indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0284] ● for case 3, the NE shall configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the second indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0285] ● for case 4, if the NE transmits, to the UE, the third MAC-CE to activate at least one TCI codepoint mapping to a DL TCI state, all DL TCI state (s) activated by the third MAC-CE are a subset of those activated by the second MAC-CE, and / or
[0286] ● for case 5, if the NE transmits, to the UE, the third MAC-CE to activate only one TCI codepoint mapping to a DL TCI state, the DL TCI state activated by the third MAC-CE is identical to that activated by the second MAC-CE activating only one TCI codepoint or that indicated by the second DCI, and / or
[0287] ● for case 6, if the NE transmits, to the UE, the third DCI to indicate a TCI codepoint mapping to a DL TCI state, the DL TCI state indicated by the third DCI is identical to that indicated by the second DCI.
[0288] In some embodiments, if:
[0289] ● or when the UE is operating in the second scenario in the serving cell or BWP, and / or
[0290] ● the UE receives, from the NE, the third MAC-CE activating at least one TCI codepoint mapping to a joint / DL TCI state, and / or
[0291] ● the UE receives, from the NE, the third MAC-CE activating only one TCI codepoint, which is mapping to at least a joint / DL TCI state, and / or
[0292] ● the UE receives, from the NE, the third DCI indicating a TCI codepoint mapping to at least a joint / DL TCI state,
[0293] then, the UE may expect at least one of the followings acts to occur, if at least one of the following cases occur:
[0294] ● for case 1, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use one or the same indicated joint / DL TCI state (either the first or the second) for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0295] ● for case 2, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the first indicated joint / DL TCI state for all receiving DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0296] ● for case 3, the UE receives configuration (s) , from the NE, to configure or indicate (e.g., via applyIndicatedTCI-State) the UE to apply / use the second indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0297] ● for case 4, if UE receives configuration (s) , from the NE, of the third MAC-CE to activate at least one TCI codepoint mapping to a DL TCI state, all DL TCI state (s) activated by the third MAC-CE are a subset of those activated by the second MAC-CE, and / or
[0298] ● for case 5, if the UE receives configuration (s) , from the NE, of the third MAC-CE to activate only one TCI codepoint mapping to a DL TCI state, the DL TCI state activated by the third MAC-CE is identical to that activated by the second MAC-CE activating only one TCI codepoint or that indicated by the second DCI, and / or
[0299] ● for case 6, if the UE receives configuration (s) , from the NE, of the third DCI to indicate a TCI codepoint mapping to a DL TCI state, the DL TCI state indicated by the third DCI is identical to that indicated by the second DCI.
[0300] In some other embodiments, if:
[0301] ● or when the UE is operating in the second scenario in the serving cell or BWP, and / or
[0302] ● the UE receives, from the NE, the third MAC-CE activating at least one TCI codepoint mapping to a joint / DL TCI state, and / or
[0303] ● the UE receives, from the NE, the third MAC-CE activating only one TCI codepoint, which is mapping to at least a joint / DL TCI state, and / or
[0304] ● the UE receives, from the NE, the third DCI indicating a TCI codepoint mapping to at least a joint / DL TCI state,
[0305] then the UE may not expect at least one of the followings acts to occur, or the UE may determine it is an error case, or the UE may discard / ignore such activation (s) / indication (s) , if at least one of the following cases occurs, or the UE may report a UE capability indicating whether the UE supports at least one of the following cases:
[0306] ● for case 1, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the second indicated joint / DL TCI state for all receiving DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0307] ● for case 2, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use the first indicated joint / DL TCI state for receiving all DL channel (s) / RS (s) that may share / apply indicated joint / DL TCI state (s) , and / or
[0308] ● for case 3, if the UE receives, from the NE, the third MAC-CE to activate at least one TCI codepoint mapping to a DL TCI state, at least one DL TCI state activated by the third MAC-CE is not a subset of those activated by the second MAC-CE, and / or
[0309] ● for case 4, if the UE receives, from the NE, the third MAC-CE to activate only one TCI codepoint mapping to at least one DL TCI state, the DL TCI state activated by the third MAC-CE is different from that activated by the second MAC-CE activating only one TCI codepoint or that indicated by the second DCI, and / or
[0310] ● for case 5, if UE receives, from the NE, the third DCI to indicate a TCI codepoint mapping to at least one DL TCI state, the DL TCI state indicated by the third DCI is different from that indicated by the second DCI.
[0311] In some embodiments, if / when the UE is operating in the second scenario in the serving cell or BWP, the UE may only apply / use one specific (indicated) joint / DL TCI state (e.g., the first indicated joint / DL TCI state) for receiving a DL channel / RS that may share / apply indicated joint / DL TCI state (s) or receiving PDSCH scheduled by DCI format 1_1 / 1_2, when one or a combination of the following cases occurs:
[0312] ● for case 1, if the UE receives, from the NE, the third MAC-CE activating at least one TCI codepoint mapping to a joint / DL TCI state, and / or
[0313] ● for case 2, if the UE receives, from the NE, the third MAC-CE activating only one TCI codepoint, which is mapping to at least a joint / DL TCI state, and / or
[0314] ● for case 3, if the UE receives, from the NE, the third DCI indicating a TCI codepoint mapping to at least a joint / DL TCI state, and / or
[0315] ● for case 4, the UE receives configuration (s) , from the NE, to configure or indicate to (e.g., via applyIndicatedTCI-State) the UE to apply / use an indicated joint / DL TCI state different from the specific indicated joint / DL TCI state for receiving the DL channel / RS that may share / apply indicated joint / DL TCI state (s) , and / or
[0316] ● for case 5, the UE receives, from the NE, a scheduling / triggering DCI for the DL channel / RS that may share / apply indicated joint / DL TCI state (s) , where the scheduling / triggering DCI is on a CORESET associated with a TRP identifier (e.g., coresetPoolIndex) different from that associated with the specific indicated joint / DL TCI state, and / or
[0317] ● for case 6, if the UE receives, from the NE, the third MAC-CE to activate at least one TCI codepoint mapping to a DL TCI state, at least one DL TCI state activated by the third MAC-CE is not a subset of those activated by the second MAC-CE, and / or
[0318] ● for case 7, if the UE receives, from the NE, the third MAC-CE to activate only one TCI codepoint mapping to at least one DL TCI state, the DL TCI state activated by the third MAC-CE is different from that activated by the second MAC-CE activating only one TCI codepoint or that indicated by the second DCI, and / or
[0319] ● for case 8, if the UE receives, from the NE, the third DCI to indicate a TCI codepoint mapping to at least one DL TCI state, the DL TCI state indicated by the third DCI is different from that indicated by the second DCI.
[0320] With regard to the SRS configuration for the second scenario of FIG. 6, when the SRS is for NCB toward the second TRP, the SRS is not configured with an associated CSI-RS by the NE. In some embodiments, the UE may receive, from the NE, configuration (s) of one or more SRS resource set (s) for NCB UL transmission in a serving cell or BWP, e.g., SRS resource set (s) with the RRC parameter usage configured as ‘nonCodebook’ .
[0321] In some embodiments, if:
[0322] ● the UE is operating in the second scenario in the serving cell or BWP, and / or
[0323] ● the NE configures / indicates / detects the UE is operating in the second scenario in the serving cell or BWP, and / or
[0324] ● if the one or more SRS resource set (s) for NCB UL is scheduled / triggered by a PDCCH on a CORESET associated with coresetPoolIndex #1 or other second TRP identifier, and / or
[0325] ● if the one or more SRS resource set (s) for NCB UL is transmitted toward the second TRP, and / or
[0326] ● if the one or more SRS resource set (s) for NCB UL is associated with the second TRP or the second TRP identifier, and / or
[0327] ● if the one or more SRS resource set (s) for NCB UL is indicated / configured by the NE or determined by the UE to apply a pathloss offset,
[0328] then, the NE or the UE may perform one of the following acts:
[0329] ● the NE may refrain from configuring a CSI-RS to be associated with the one or more SRS resource set (s) for NCB UL, and / or
[0330] ● the UE may not expect the following or the UE may determine it is an error case, or the UE may discard / ignore such configuration (s) , if the UE is configured by the NE with a CSI-RS to be associated with the one or more SRS resource set (s) for NCB UL.
[0331] Turning to the pathloss offset and pathloss RS handling for the second scenario, for PUSCH, PUCCH, SRS to the second TRP (UL only TRP) , the pathloss calculation is based on a pathloss RS configured in the second indicated joint / UL TCI state or a reference signal in the first indicated joint / DL TCI state and a pathloss offset.
[0332] In some embodiments, the NE may transmit, to the UE, configuration (s) of a pathloss RS for the second indicated joint / UL TCI state. In some other embodiments, the NE may refrain from transmitting to the UE configuration (s) of the pathloss RS for the second indicated joint / UL TCI state. In some cases, if the NE transmits, to the UE, configuration (s) of the pathloss RS for the second indicated joint / UL TCI state, the pathloss RS may be transmitted from the first TRP or associated with the first TRP or the first TRP identifier. In some embodiments, the NE may transmit, to the UE, configuration (s) and / or indication (s) of a second pathloss offset for determining / calculating pathloss when determining the UL transmit power for transmitting a UL transmission via the second indicated joint / UL TCI state. In such embodiments, the second pathloss offset may be configured / indicated if the NE configures / indicates / detects the UE is operating in the second scenario in the serving cell or BWP.
[0333] In some embodiments, if the UE is operating in the second scenario, and / or if the UE is indicated to apply / use the second indicated joint / UL TCI state to transmit a UL transmission occasion, when determining the UL transmit power for transmitting the UL transmission occasion, the UE may determine / calculate the pathloss based on one or a combination of the following:
[0334] ● the pathloss RS, if configured, for the second indicated joint / UL TCI state, and / or
[0335] ● a reference signal (e.g., QCL TypeA / C RS, QCL TypeD RS) for the first indicated joint / DL TCI state. In such case, the UE may measure a pathloss via the reference signal or determine the reference signal is a pathloss RS for the second indicated joint / UL TCI state, and / or
[0336] ● the second pathloss offset.
[0337] For the PRACH approach, the pathloss calculation is based on a pathloss RS and / or the second pathloss offset. More specifically, if the UE is operating in the second scenario, and / or if the UE determines to transmit a PRACH (e.g., for CBRA or RA procedure triggered by PDCCH order or other type of CFRA, like CFRA for BFR or system information request) , when determining the UL transmit power for transmitting the PRACH, the UE may determine / calculate the pathloss based on one or a combination of the following:
[0338] ● a SSB or CSI-RS used by the UE to transmits the PRACH, and / or
[0339] ● the second pathloss offset.
[0340] In some embodiments, if the UE is operating in the second scenario, and / or if the UE transmits a PRACH, the UE may determine whether to use the second pathloss offset for determining / calculating the pathloss based on a TRP identifier value (e.g., coresetPoolIndex) associated with the PRACH, and / or a RA configuration (e.g., RACH-ConfigGeneric, RACH-ConfigCommon, or RACH-ConfigDedicated) from the NE. In some cases, the UE may determine to use the second pathloss offset and the used SSB / CSI-RS for determining / calculating the pathloss, if the PRACH is associated with the second TRP identifier (e.g., coresetPoolIndex #1) or the RA configuration indicates the UE to perform this way. In some cases, the UE may determine to not use the second pathloss offset and only rely on the used SSB / CSI-RS for determining / calculating the pathloss, if the PRACH is associated with the first TRP identifier (e.g., coresetPoolIndex #0) or the RA configuration indicates the UE to perform this way.
[0341] In some embodiments, if the NE configures / indicates / detects that the UE is operating in the second scenario, and / or if the NE transmits, to the UE, RA configuration (s) (e.g., RACH-ConfigGeneric, RACH-ConfigCommon, or RACH-ConfigDedicated) , the NE may configure, for the UE, the second pathloss offset for each SSB or CSI-RS associated with the PRACH via the RA configuration (s) . The NE may transmit or utilize common or separate configurations for the SSBs / CSI-RSs associated with PRACH. In some embodiments, the NE may configure, for the UE, the second pathloss offset for each PRACH occasion or resource. If the second pathloss offset is not configured by the NE, the UE may determine the second pathloss offset to be 0 dB.
[0342] With regard to the pathloss offset configuration and indication for PUSCH / PUCCH / SRS and PRACH for the second scenario, various options are possible. In some embodiments, the NE may transmit to the UE configuration (s) and / or indication (s) of the second pathloss offset based on one of the following options:
[0343] ● for option 1, RRC configuration (s) are used to configure / indicate one pathloss offset as the second pathloss offset. In such option, the NE may update the second pathloss offset via RRC reconfiguration.
[0344] ● for option 2, a MAC-CE activation / indication or DCI indication may be used to indicate one pathloss offset as the second pathloss offset. For this option, the following cases are possible:
[0345] ○ the NE may transmit configuration (s) of one or more candidate pathloss offset, and then transmit a MAC-CE to activate / indicate or a DCI to indicate one of configured pathloss offset as the second pathloss offset, and / or
[0346] ○ before the NE transmits a MAC-CE to activate / indicate or a DCI to indicate one of configured pathloss offset, the UE may apply an initial or default pathloss offset configured by the NE as the second pathloss offset, and / or
[0347] ○ the NE may update / change the second pathloss offset via transmitting another one MAC-CE or DCI, and / or
[0348] ○ the NE may transmit the MAC-CE or DCI in unicast manner, e.g., based on cell radio network temporary identifier (C-RNTI) or modulation and coding scheme C-RNTI (MCS-C-RNTI) , or in group-cast manner, e.g., based on an RNTI predefined or configured by the NE. For group-cast based operation, the NE may configure the location / block of the pathloss offset, e.g., the corresponding DCI field in the DCI or MAC CE field in the MAC CE, for the UE and one or more other UE (s) , and / or
[0349] ○ the UE may apply the activated / indicated pathloss offset after X symbols or slots or milliseconds after the UE transmits the last symbol of the PUCCH or PUSCH with the acknowledgement corresponding to the MAC CE or DCI or after the UE receives the last symbol of the PDSCH with the MAC CE or the PDCCH with the DCI, and / or
[0350] ○ the UE may determine or calculate the second pathloss offset based on a cumulative or absolute manner. For the cumulative manner, the UE may determine the second pathloss offset based on the current second pathloss offset and the activated / indicated pathloss offset, e.g., current second pathloss offset plus the activated / indicated pathloss offset. For the absolute manner, the UE may determine the second pathloss offset by replacing the current second pathloss offset by the activated / indicated pathloss offset. The NE may configure whether the second pathloss offset is indicated / determined in an accumulative or absolute manner.
[0351] In such embodiments, for option 1 and / or option 2, the NE may configure for the UE that the pathloss offset indicated by the RRC configuration (s) , MAC-CE, or DCI (e.g., the second pathloss offset) is per configured TCI state, per activated TCI state, per indicated TCI state, per TCI state group, per UL channel / RS, per UL resource, per UL resource group (e.g., PUCCH resource group) , per configured UL grant, per (configured) pathloss reference signal, per pathloss reference signal group, per SSB, per BWP, or per serving cell.
[0352] In some embodiments, if the second pathloss offset is not configured / indicated to the UE by the NE, the UE may determine the value of the second pathloss offset to be 0dB. In one example, the NE may configure multiple pathloss offsets, and configure the second pathloss offset by indicating the pathloss offset index associated with or configured in a TCI state or pathloss reference signal.
[0353] According to a different approach, a pathloss RS indication and another way of pathloss offset indication for CFRA is triggered by PDCCH order. In some embodiments, if the UE is operating in the second scenario, and / or if the UE receives a PDCCH order indicating / triggering the UE to perform a PRACH transmission, the PDCCH order may indicate at least one of the following:
[0354] ● a SSB index. In such case, the SSB index may be used as a pathloss RS for determining / calculating the pathloss when determining the UL transmit power; and / or
[0355] ● a second pathloss offset. In such case, the second pathloss offset may be used for determining / calculating the pathloss when determining the UL transmit power, and / or the UE may determine / calculate the pathloss via the indicated second pathloss offset plus the indicated SSB index, or via the indicated second pathloss offset plus the QCL source RS for the indicated DL TCI state for receiving the CORESET where the PDCCH order is transmitted; and / or
[0356] ● a DCI field. In such case, if the DCI field is present, the DCI field may indicate how to derive the pathloss for transmitting the indicated / triggered PRACH transmission. The DCI field may indicate to the UE how to derive the pathloss based on the QCL source RS for the indicated joint / DL TCI state for receiving the CORESET where the PDCCH order is transmitted. The DCI field may indicate to the UE how to derive the pathloss based on the indicated SSB index and / or the indicated second pathloss offset in the PDCCH order. In such case, the DCI field may be present in the PDCCH order, even if the NE does not transmit to the UE configuration (s) enabling two TAGs for a serving cell (e.g., tag-Id2) and / or inter-cell M-TRP feature (e.g., SSB-MTC-AddtionalPCI) .
[0357] According to another approach, the UE requests the pathloss offset configuration / indication in an UE-initiated manner. In some embodiments, the UE may transmit a signal to trigger / request the NE to transmit RRC configuration (s) or MAC-CE activation / indication or DCI indication to indicate / update the second pathloss offset. In some embodiments, if the UE is operating in the second scenario, the UE may transmit a signal to trigger / request the NE to transmit RRC configuration (s) or MAC-CE activation / indication or DCI indication to indicate / update the second pathloss offset. The UE may transmit the signal by uplink control information (UCI) on PUCCH or PUSCH, or by MAC-CE on PUSCH. A prohibit timer may be predefined or configured by the NE. The UE may start or restart / reset the prohibit timer after reception of the first pathloss offset update signaling. It may trigger the procedure to request the first pathloss offset after / if the prohibit timer expires.
[0358] In some embodiments, if the SUL is configured for the second scenario, the NE may configure the second pathloss offset for NUL and the second pathloss offset for SUL. More specifically, if the UE is operating in the second scenario in a serving cell or BWP, and / or if the UE receives, from the NE, configuration (s) of SUL for the serving cell or BWP, the UE may receive, from the NE, configuration (s) / indication (s) of the second pathloss offset for a NUL in the serving cell or BWP and / or the second pathloss offset for a SUL in the serving cell or BWP. This implies that the NE may separately configure / indicate / update the second pathloss offset for NUL and that for SUL. In some cases, the UE may determine whether to apply the second pathloss offset for NUL or SUL for a UL transmission, based on whether the UL transmission is transmitted on a NUL or SUL.
[0359] In some embodiments, the UE may determine whether to apply the second pathloss offset for NUL or SUL for an UL transmission, based on whether the UL transmission is transmitted on a NUL or SUL. In some embodiments, if the UE is operating in the second scenario in a serving cell or BWP, and / or if the UE receives, from the NE, configuration (s) of SUL for the serving cell or BWP, when determining the UL transmit power for transmitting a UL transmission (e.g., PUSCH, PUCCH, SRS or PRACH) , the UE may determine / calculate a pathloss, based on whether the UL transmission is configured / indicated by the NE to transmit on a NUL or SUL in the serving cell or BWP. In some cases, if the UL transmission is configured / indicated to transmit on a NUL, and the UE determines or is indicated / configured by the NE to apply the second pathloss offset for the UL transmission, the UE applies the second pathloss offset for the NUL. In some cases, if the UL transmission is configured / indicated to transmit on a SUL, and the UE determines or is indicated / configured by the NE to apply the second pathloss offset for the UL transmission, the UE applies the second pathloss offset for the SUL.
[0360] For the second scenario, the UE may indicate whether to support a pathloss offset configuration / indication. In some embodiments, the UE may transmit, to the NE, a UE capability report to indicate whether the UE supports determining / calculating pathloss based on a second pathloss offset. In some embodiments, if the NE configures / indicates / detects the UE is operating in the second scenario, and / or if the UE supports determining / calculating a pathloss based on a second pathloss offset, the NE may transmit configuration (s) to enable the UE to determine / calculate the pathloss based on a configured / activated / indicated second pathloss offset. In some embodiments, if the UE does not support determining / calculating the pathloss based on a second pathloss offset, the NE shall transmit, to the UE, configuration (s) of a pathloss RS for the second indicated UL TCI state, where the pathloss RS may be transmitted from the second TRP or associated with the second TRP or the second TRP identifier (e.g., coresetPoolIndex #1) .
[0361] According to one approach, the NE may use or configure a pathloss RS configuration for all or some UL beams to reduce UE complexity. In some embodiments, the NE may not configure, for the UE, a pathloss RS for each configured joint / UL TCI state respectively in a serving cell or BWP. In some embodiments, if the NE configures / indicates / detects the UE is operating in the second scenario in a serving cell or BWP, the NE may not configure, for the UE, a pathloss RS for each configured joint / UL TCI state, respectively, in the serving cell or BWP. In some other embodiments, if the NE configures / indicates / detects the UE is operating in the second scenario in a serving cell or BWP, the NE may not or may refrain from configuring, for the UE, a pathloss RS for all configured joint / UL TCI state (s) in the serving cell or BWP. This may imply that if the NE configures / indicates / detects the UE is operating in the second scenario in a serving cell or BWP, the NE may configure, for the UE, pathloss RS (s) for some configured joint / UL TCI state (s) respectively, and no pathloss RS (s) for other configured joint / UL TCI state (s) in the serving cell or BWP.
[0362] In some embodiments, the NE may not configure, for the UE, a pathloss RS for the second indicated joint / UL TCI state in a serving cell or BWP. In some embodiments, if the NE configures / indicates / detects the UE is operating in the second scenario, the NE may not configure, for the UE, a pathloss RS for the second indicated joint / UL TCI state in a serving cell or BWP. In some embodiments, the NE shall configure, for the UE, a pathloss RS for the first indicated joint / UL TCI state in a serving cell or BWP.
[0363] In some embodiments, if the NE does not configure, for the UE, a pathloss RS for a configured joint / UL TCI state or for the second indicated joint / UL TCI state in a serving cell or BWP, the NE or the UE may perform acts associated with one of the following options:
[0364] ● for option 1, the NE may configure, for the UE, a second pathloss RS (per serving cell or per BWP) for the serving cell or BWP. For this option, the UE may use the second pathloss RS for determining / calculating the pathloss when determining the UL transmit power for transmitting a UL transmission occasion via a joint / UL TCI state without a configured pathloss RS. Also for this option, the second pathloss RS may be commonly used by the UE for all configured joint / UL TCI state (s) without a configured pathloss RS.
[0365] ● for option 2, the UE may use a reference signal (e.g., QCL TypeA / C RS, QCL TypeD RS) for the first indicated joint / DL TCI state for determining / calculating the pathloss when determining the UL transmit power for transmitting a UL transmission occasion via a joint / UL TCI state without a configured pathloss RS.
[0366] A method to be implemented at the NE (or UE) for the second scenario is discussed with regard to FIG. 8. The NE transmits 820 a control signal configuring: one or more joint or downlink or uplink, joint / DL / UL, transmission configuration indicator, TCI, states, and a corresponding pathloss offset, for downlink operation in a single transmission reception mode and for uplink operation in a multiple transmission reception mode. The NE transmits 850 an activation signal for activating one or two joint / DL / UL TCI states from the configured one or more joint / DL / UL TCI states, and receives 880 an uplink transmission based on one or more joint or UL, joint / UL, TCI states from the activated one or two joint / UL TCI states, and a transmit power based on the corresponding pathloss offset. For the second scenario, the activated one or two joint / DL / UL TCI states are associated with a DL transmission for the first TRP, and a respective UL transmission for each of the first TRP and second TRP. Similar method steps may be applied to the UE by replacing the term “transmitting” with “receiving” and vice versa.
[0367] It is noted that throughout this document, 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 NE.
[0368] The UE may be configured with and / or served by the NE in a serving cell. The UE may (be configured to) communicate with the NE in the serving cell. The UE may be configured with one or more serving cells by the NE, which may include the serving cell. The UE may be activated or be indicated, by the NE, to activate one or more serving cells, which may include the serving cell. The UE may be configured and / or instructed, by the NE, with one or more BWPs. The UE may be indicated and / or configured with, by the NE, a BWP (in the serving cell) . In some cases, the BWP may be activated as an active BWP. In some cases, the BWP may be referred to an active BWP. In some cases, the BWP may be an active DL BWP. In some cases, the BWP may be an active UL BWP. In some cases, the BWP may be an initial BWP. In some cases, the BWP may be a default BWP. In some cases, the BWP may be a dormant BWP.
[0369] The UE may be in one of RRC_CONNECTED state, RRC_INACTIVE state or RRC_IDLE state.
[0370] In this document, 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. It is noted that throughout this disclosure, a NUL may mean or be referred to as a normal uplink, a UL, an uplinkConfig configuration or a non-supplementary uplink. It is noted that throughout this disclosure, when / if the NE configures / indicated / instructed the UE to perform a behavior or procedure, it may be referred to as or replaced with that the NE transmits, to the UE, configuration (s) / indication (s) of indicating the UE to perform the behavior or procedure.
[0371] In this document, when / if the UE is configured / indicated / instructed to perform a behavior or procedure, it may be referred to as or replaced with that the UE receives, from the NE, configuration (s) / indication (s) that instruct the UE to perform the behavior or procedure. It is noted that throughout this disclosure, when / if the NE configures / indicates / instructs the UE with an object, it may be referred to as, or replaced with that the NE transmits, to the UE, configuration (s) / indication (s) of the object. It is noted that throughout this disclosure, when / if the UE is configured / indicated / instructed with an object, it may be referred to as, or replaced with that the UE receives, from the NE, configuration (s) / indication (s) of the object.
[0372] In this document, a first joint / DL / UL TCI state indicated by a DCI or a MAC-CE may be referred to as or replaced as a first indicated joint / DL / UL TCI state. It is noted that throughout this disclosure, a second joint / DL / UL TCI state indicated by a DCI or a MAC-CE may be referred to as or replaced as a second indicated joint / DL / UL TCI state. It is noted that throughout this disclosure, the first joint / DL / UL TCI state may be referred to as one of or a combination of a first joint TCI state, a first DL TCI state, and a first UL TCI state. It is noted that throughout this disclosure, the second joint / DL / UL TCI state may be referred to as one of or a combination of a second joint TCI state, a second DL TCI state, and a second UL TCI state.
[0373] In this document, a Unified TCI States Activation / Deactivation MAC CE may be a MAC-CE identified by eLCID codepoint 233 or eLCID index 297. It is noted that throughout this disclosure, an Enhanced Unified TCI States Activation / Deactivation MAC CE for Joint TCI States may a MAC-CE identified by eLCID codepoint 225 or eLCID index 289. It is noted that throughout this disclosure, an Enhanced Unified TCI States Activation / Deactivation MAC CE for Separate TCI States may be a MAC-CE identified by eLCID codepoint 226 or eLCID index 290.
[0374] In this document, 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.
[0375] In this document, an 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.
[0376] In this document, 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' .
[0377] In this document, for case (s) in which 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' .
[0378] In this document, for case (s) that a NE 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 can imply or be referred to be one of the following:
[0379] ● no TRP identifier or no TRP-related index is configured or indicated, by the NE, to any channel or RS in the serving cell or BWP, and / or
[0380] ● (only) one TRP identifier or TRP-related index is configured or indicated, by the NE, to any channel or RS in the serving cell or BWP, and / or
[0381] ● when the UE or the NE 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.
[0382] In this document, for case (s) that a NE 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 can imply or be referred to be one of the following:
[0383] ● more than one TRP identifier or TRP-related index is configured or indicated, by the NE, to at least one channel or RS in the serving cell or BWP, and / or
[0384] ● one TRP identifier or TRP-related index is configured or indicated, by the NE, 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
[0385] ● when the UE or the NE 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
[0386] ● the NE configures, for 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
[0387] ● the UE receives, from the NE, 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.
[0388] In this document, for case (s) that a NE 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 can imply or be referred to be one of the following:
[0389] ● more than one TRP identifier or TRP-related index is configured or indicated, by the NE, to at least one channel or RS in the serving cell or BWP, and / or
[0390] ● one TRP identifier or TRP-related index is configured or indicated, by the NE, 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
[0391] ● the NE configures, for the UE, a higher layer parameter PDCCH-Config that contains two different values of coresetPoolIndex in ControlResourceSet in the serving cell or BWP.
[0392] In this document, for case (s) that a NE 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 can imply or be referred to be one of the following:
[0393] ● when the UE or the NE 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
[0394] ● the UE receives, from the NE, 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 or specific to different TRP or different TRP identifier (value) . 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 TRPs or different TRP identifiers (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 TRPs or different TRP identifiers (value) , and / or
[0395] ● the UE receives, from the NE, a DCI with TCI field in the serving cell or BWP, which indicates a TCI codepoint mapped to two TCI states, each of which is associated with different TRP or different TRP identifier (value) , and / or
[0396] ● the UE receives, from the NE, a DCI with TCI selection field in the serving cell or BWP, which indicates the UE to apply or use both the first and the second indicated joint / DL TCI state (s) .
[0397] In this document, 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.
[0398] In this document, an expression of “X / Y” may mean of “X or Y” . It is noted that throughout this disclosure, an expression of “X / Y” may mean “X and Y” . It is noted that throughout this disclosure, an expression of “X / Y” may mean “X and / or Y” . It is noted that throughout this disclosure, an expression of “ (A) B” or “B (A) ” may include the concept of “only B” . It is noted that throughout this disclosure, an expression of “ (A) B” or “B (A) ” may include the concept of “A+B” or “B+A” .
[0399] It is noted that some or all of the foregoing or the following embodiments could be jointly combined or formed to be a new or another one embodiment. 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.
[0400] The following additional considerations may apply to the foregoing and the following discussions. 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. Any sentence, paragraph, (sub) -bullet, point, action, or claim described in each of the foregoing or the following embodiment (s) / implementation (s) / 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) / implementation (s) / concept (s) mentioned in this document is just one possible embodiment which would not restrict the specific method.
[0401] Some or all of the following terminology and assumption may be used hereafter.
[0402] BS is 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.
[0403] TRP is a transmission and reception point that provides network coverage and directly communicates with UEs. TRP may be referred to as distributed unit (DU) or network node.
[0404] Cell is a cell composed of one or multiple associated TRPs, i.e. coverage of the cell is composed of coverage of all associated TRP (s) . One cell is controlled by one BS or a NE. Cell may be referred to as TRP group (TRPG) .
[0405] Serving beam for a UE is a beam generated by a network node, e.g. TRP, which is configured to be used to communicate with the UE, e.g. for transmission and / or reception.
[0406] Candidate beam for a UE is a candidate of a serving beam. Serving beam may or may not be candidate beam.
[0407] 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.
[0408] 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 include 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 include 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.
[0409] 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.
[0410] Numerical adjectives “first” , “second” , and “third” do not imply any order (are not ordinals) but are markers to distinguish separate instances of similar elements. References to the singular (e.g., “a” or “an” , “the” ) should include the plural unless clearly indicated otherwise.
[0411] As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. For example, “at least one of: a, b, or c” is intended to cover the possibilities of: a only, b only, c only, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a and b and c.
[0412] Although the features and elements of the present embodiments are described in the embodiments in particular combinations, each feature or element may be used alone without the other features and elements of the embodiments or in various combinations with or without other features and elements disclosed herein. The methods or flowcharts may be implemented in a computer program, software or firmware tangibly embodied in a computer-readable storage medium for execution by a specifically programmed computer or processor.
Claims
1.A wireless communication method performed by a user equipment, UE, (102) , the method comprising:receiving (520) from a network entity, a control signal configuring: one or more joint or downlink or uplink, joint / DL / UL, transmission configuration indicator, TCI, states, and a corresponding pathloss offset, for downlink operation in a single transmission reception mode and for uplink operation in a multiple transmission reception mode;receiving (550) , from the network entity, an activation signal for activating one or two joint / DL / UL TCI states from the configured one or more joint / DL / UL TCI states; andtransmitting (580) an uplink transmission based on one or more joint or UL, joint / UL, TCI states from the activated one or two joint / UL TCI states, and a transmit power based on the corresponding pathloss offset.2.The method of Claim 1, wherein the activated one or two joint / DL / UL TCI states are associated with a DL transmission for a first transmission reception point, TRP, and a respective UL transmission for each of the first TRP and a second TRP.3.The method of Claim 2, wherein the control signal configures, for the one or more joint / DL / UL TCI states, a joint TCI state mode or a separate TCI state mode.4.The method of any of Claims 2 or 3, wherein for the separate TCI state mode, only one DL TCI state is activated or indicated from the one or more joint / DL / UL TCI states.5.The method of any of Claims 2 to 4, wherein,for single-downlink control information, S-DCI, a TCI selection field is not configured when two joint or DL, joint / DL, TCI states are activated or indicated;for the S-DCI and the separate TCI state mode, two identical DL TCI states are used;for multiple-downlink control information, M-DCI, only one indicated joint / DL TCI state is used when two joint / DL TCI states are activated or indicated; orfor the M-DCI and the separate TCI state mode, two identical DL TCI states are indicated.6.The method of any of Claims 2 to 5, wherein a sounding reference signal, SRS transmission, for non-codebook, NCB, to the second TRP is not associated with channel state information-reference signal, CSI-RS.7.The method of any of Claims 2 to 6, further comprising:calculating a pathloss for the second TRP, which is determined based on a pathloss resource signal, RS, configured in a reference signal associated with a first indicated joint / DL TCI state or associated with a second indicated joint / UL TCI state, and a pathloss offset.8.The method of any of Claims 2 to 7, further comprising:calculating, for physical random access channel, PRACH, the pathloss based on the pathloss RS and / or a second pathloss offset, which is associated with the second indicated joint / UL TCI state;calculating, for the PRACH, the pathloss based on a pathloss RS indication and a pathloss offset indication triggered by physical downlink control channel, PDCCH, order;sending the pathloss offset configuration and the pathloss offset indication upon UE request;sending, to the UE, a configuration of the second pathloss offset for a normal uplink, NUL, and / or a configuration of the second pathloss offset for a supplementary uplink, SUL; orsending a common pathloss RS for plural UL transmissions for a serving cell or bandwidth part.9.The method of Claim 1, wherein the activated one or two joint / DL / UL TCI states are associated with a DL transmission for a first transmission reception point, TRP, and a respective UL transmission for each of the first TRP and a second TRP, the respective UL transmission for the first TRP being restricted to only a sounding reference signal, SRS, transmission for antenna switching, AS.10.The method of Claim 9, further comprising:receiving downlink control information (DCI) indicating one joint / DL / UL TCI state from the activated one or two joint / DL / UL TCI states.11.The method of any of Claims 9 or 10, wherein the control signal only configures, for the one or more joint / DL / UL TCI states, a separate TCI state mode.12.The method of any of Claims 9 to 11, wherein the SRS transmission for AS toward the first TRP uses a TCI state different from an indicated UL TCI state of the separate TCI state mode, and SRS transmission for non-codebook, NCB, to the second TRP is not associated with a channel state information-reference signal, CSI-RS.13.The method of any of Claims 9 to 12, further comprising:receiving a set of UL power control, PC, parameters dedicated to the SRS transmission for AS to the first TRP.14.The method of any of Claims 9 to 13, further comprising:calculating a pathloss for the second TRP, which is based on a pathloss resource signal, RS, configured in the indicated UL TCI state or a reference signal in an indicated DL TCI state, and a first pathloss offset.15.The method of any of Claim 14, further comprising:calculating, for physical random access channel, PRACH, the pathloss is based on the pathloss RS and / or a first pathloss offset, which is associated with a first joint / UL TCI state;sending a configuration of the first pathloss offset for PUSCH / PUCCH / SRS and PRACH;sending a pathloss RS indication and a pathloss offset indication based on a PDCCH order;sending the first pathloss offset configuration upon EU request;sending a configuration of the first pathloss offset for a normal uplink, NUL, and / or a configuration of the first pathloss offset for a supplementary uplink, SUL; orsending a common pathloss RS for plural UL transmissions for a serving cell or bandwidth part.16.A wireless communication method performed by a network entity, NE, (110) , the method comprising:transmitting (820) a control signal configuring: one or more joint or downlink or uplink, joint / DL / UL, transmission configuration indicator, TCI, states, and a corresponding pathloss offset, for downlink operation in a single transmission reception mode and for uplink operation in a multiple transmission reception mode;transmitting (850) an activation signal for activating one or two joint / DL / UL TCI states from the configured one or more joint / DL / UL TCI states; andreceiving (890) an uplink transmission from a user equipment, UE, (102) based on one or more joint or UL, joint / UL, TCI states from the activated one or two joint / UL TCI states, and a transmit power based on the corresponding pathloss offset.17.The method of Claim 16, wherein the activated one or two joint / DL / UL TCI states are associated with a DL transmission for a first transmission reception point, TRP, and a respective UL transmission for each of the first TRP and a second TRP, andwherein the control signal configures a joint TCI state mode or a separate TCI state mode including an indicated first UL TCI state.18.The method of Claim 17, wherein,for single-downlink control information, S-DCI, a TCI selection field is not configured when two joint / DL TCI states are activated or indicated;for the S-DCI and the separate TCI state mode, two identical DL TCI states are used;for multiple-downlink control information, M-DCI, only one indicated joint / DL TCI state is used when two joint / DL TCI states are activated or indicated; orfor the M-DCI and the separate TCI state mode, two identical DL TCI states are indicated.19.The method of Claim 16, wherein the activated one or two joint / DL / UL TCI states are associated with a DL transmission for a first transmission reception point, TRP, and a respective UL transmission for each of the first TRP and a second TRP, the respective UL transmission of the first TRP being restricted to only a sounding reference signal, SRS, transmission for antenna switching, AS, andwherein the control signal only configures, for the one or more joint / DL / UL TCI states, a separate TCI mode.20.A wireless communication device (102, 110) comprising a transceiver (154, 134) , a processor (155, 135) , and computer-readable storage media (152, 132) storing executable instructions for the processor to perform any one of methods recited in claims 1-19, using the transceiver.
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Apparatus and method for communicating over different beams
CN116530030A