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WO2024168467A1 - Améliorations pour prendre en charge une opération multi-trp - Google Patents

Améliorations pour prendre en charge une opération multi-trp Download PDF

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Publication number
WO2024168467A1
WO2024168467A1 PCT/CN2023/075677 CN2023075677W WO2024168467A1 WO 2024168467 A1 WO2024168467 A1 WO 2024168467A1 CN 2023075677 W CN2023075677 W CN 2023075677W WO 2024168467 A1 WO2024168467 A1 WO 2024168467A1
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WO
WIPO (PCT)
Prior art keywords
mode
trp
tci
tci state
mtrp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/075677
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English (en)
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WO2024168467A8 (fr
Inventor
Hong He
Chunhai Yao
Dawei Zhang
Haitong Sun
Jie Cui
Wei Zeng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Apple Inc
Original Assignee
Apple Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apple Inc filed Critical Apple Inc
Priority to PCT/CN2023/075677 priority Critical patent/WO2024168467A1/fr
Priority to CN202380093998.1A priority patent/CN120642519A/zh
Publication of WO2024168467A1 publication Critical patent/WO2024168467A1/fr
Publication of WO2024168467A8 publication Critical patent/WO2024168467A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/085—Reselecting an access point involving beams of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections

Definitions

  • the present disclosure generally relates to wireless communication, and in particular, to enhancements to support multi-TRP operation.
  • a user equipment may connect to a network via a base station.
  • the base station may control multiple transmission and reception points (TRPs) .
  • TRPs transmission and reception points
  • the UE may operate in multi-TRP (mTRP) mode where the UE establishes and maintains a connection with multiple TRPs at the same time. It has been identified that there is a need to improve support for mTRP operation.
  • Some exemplary embodiments are related to a method performed by a user equipment (UE) .
  • the method includes. establishing a connection to a base station configured with multiple transmission reception points (TRPs) , receiving a signal from the base station configured to trigger a switch from a first TRP mode to a second TRP mode, wherein when the first TRP mode is a multi-TRP (mTRP) mode, then the second TRP mode if a single TRP (sTRP) mode, and when the first TRP mode if the sTRP mode, then the second TRP mode if the mTRP mode and communicating with the base station using the second TRP mode.
  • TRPs transmission reception points
  • exemplary embodiments are related to a method performed by a base station configured with multiple transmission reception points (TRPs) .
  • the method includes establishing a connection to a user equipment (UE) , transmitting a signal to the UE configured to trigger the UE a switch from a first TRP mode to a second TRP mode, wherein when the first TRP mode is a multi-TRP (mTRP) mode, then the second TRP mode if a single TRP (sTRP) mode, and when the first TRP mode if the sTRP mode, then the second TRP mode if the mTRP mode and communicating with the UE when the UE is in the second TRP mode.
  • mTRP multi-TRP
  • sTRP single TRP
  • Still further exemplary embodiments are related to a method performed by a user equipment (UE) .
  • the method includes communicating with multiple cells operating multiple component carrier (CCs) , wherein the multiple CCs are configured into two or more CC groups, receiving downlink control information (DCI) on a first CC of a first CC group, the DCI comprising an updated transmission configuration indicator (TCI) ID and performing a CC-group based TCI state update for the first CC group, where the updated TCI state ID is commonly applied to all CCs in a same CC group.
  • CCs component carrier
  • TCI transmission configuration indicator
  • Additional exemplary embodiments are related to a method performed by a user equipment (UE) .
  • the method includes receiving downlink control information (DCI that indicates a first transmission configuration indicator (TCI) state and a second TCI state, identifying a condition during which a default TCI state is to be used for physical downlink shared channel (PDSCH) reception, wherein the default TCI state comprises the first TCI state, the second TCI state or both the first and second TCI states and receiving PDSCH using the default TCI state.
  • DCI downlink control information
  • TCI transmission configuration indicator
  • PDSCH physical downlink shared channel
  • Fig. 1 shows an exemplary network arrangement according to various exemplary embodiments.
  • Fig. 2 shows an exemplary user equipment (UE) according to various exemplary embodiments.
  • UE user equipment
  • Fig. 3 shows an exemplary base station according to various exemplary embodiments.
  • Fig. 4 shows a method for switching between single-transmission reception point (sTRP) and multi-TRP (mTRP) operation according to various exemplary embodiments.
  • Fig. 5 shows an example of the relationship between downlink control information (DCI) , medium access control (MAC) control elements (CEs) and transmission configuration indicator (TCI) state lists according to various exemplary embodiments.
  • DCI downlink control information
  • MAC medium access control
  • CEs control elements
  • TCI transmission configuration indicator
  • Fig. 6 shows a deployment scenario according to various exemplary embodiments.
  • Fig. 7 shows a deployment scenario according to various exemplary embodiments.
  • Fig. 8 shows an example for TCI state determination for default beams or TCI states according to various exemplary embodiments.
  • the exemplary embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numeral s.
  • the exemplary embodiments relate to beam management and multi-transmission reception point (mTRP) operation.
  • the exemplary embodiments are described with regard to a user equipment (UE) .
  • UE user equipment
  • reference to a UE is merely provided for illustrative purposes.
  • the exemplary embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and/or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any appropriate type of electronic component.
  • the exemplary embodiments are also described with regard to a fifth generation (5G) New Radio (NR) network and a next generation node B (gNB) .
  • 5G fifth generation
  • NR New Radio
  • gNB next generation node B
  • reference to a 5G NR network and a gNB is merely provided for illustrative purposes.
  • the exemplary embodiments may be utilized with any appropriate type of network and base station.
  • the gNB may be configured with multiple transmission and reception points (TRPs) .
  • TRPs transmission and reception points
  • a TRP generally refers to a set of components configured to transmit and/or receive a beam.
  • multiple TRPs may be deployed locally at the gNB.
  • the gNB may include multiple antenna arrays/panels that are each configured to generate a different beam.
  • multiple TRPs may be deployed at various different locations and connected to the gNB via a backhaul connection.
  • multiple small cells may be deployed at different locations and connected to the gNB.
  • these examples are merely provided for illustrative purposes. Those skilled in the art will understand that TRPs are configured to be adaptable to a wide variety of different conditions and deployment scenarios.
  • any reference to a TRP being a particular network component or multiple TRPs being deployed in a particular arrangement is merely provided for illustrative purposes.
  • the TRPs described herein may represent any type of network component configured to transmit and/or receive a beam.
  • mTRP operation may include establishing and maintaining a connection with multiple TRPs at the same time.
  • CSI channel state information
  • RS reference signals
  • sTRP operation may include maintaining a connection with a single TRP.
  • a unified transmission configuration indicator (TCI) framework is intended to facilitate streamlined mTRP operation. It has been identified that there is a need for enhancements to the unified TCI framework that improve support for mTRP operation.
  • the exemplary embodiments introduce techniques for dynamic switching between sTRP and mTRP modes.
  • the exemplary embodiments introduce techniques to support component carrier (CC) -group based TCI state updates for mTRP operation.
  • the exemplary embodiments introduce techniques for determining a default downlink beam/TCI-state for mTRP physical downlink shared channel (PDSCH) reception.
  • PDSCH physical downlink shared channel
  • the exemplary embodiments provide benefits to the 5G NR unified TCI framework, the exemplary embodiments are not limited to the 5G NR unified TCI framework or even a 5G system.
  • the exemplary embodiments may be applied to any appropriate type of wireless communication system.
  • the exemplary embodiments introduced herein may be used independently from one another, in conjunction with other currently implemented mechanisms for mTRP operation, in conjunction with future implementations of mechanisms for mTRP operation or independent from other mechanisms for mTRP operation.
  • Fig. 1 shows an exemplary network arrangement 100 according to various exemplary embodiments.
  • the exemplary network arrangement 100 includes a UE 110.
  • the UE 110 may be any type of electronic component that is configured to communicate via a network, e.g., mobile phones, tablet computers, desktop computers, smartphones, phablets, embedded devices, wearables, Internet of Things (IoT) devices, etc.
  • IoT Internet of Things
  • an actual network arrangement may include any number of UEs being used by any number of users.
  • the example of a single UE 110 is merely provided for illustrative purposes.
  • the UE 110 may be configured to communicate with one or more networks.
  • the network with which the UE 110 may wirelessly communicate is a 5G NR radio access network (RAN) 120.
  • the UE 110 may also communicate with other types of networks (e.g., sixth generation (6G) RAN, 5G cloud RAN, a next generation RAN (NG-RAN) , a long term evolution (LTE) RAN, a legacy cellular network, a wireless local area network (WLAN) , etc. ) and the UE 110 may also communicate with networks over a wired connection.
  • 6G sixth generation
  • 5G cloud RAN e.g., 5G cloud RAN, a next generation RAN (NG-RAN) , a long term evolution (LTE) RAN, a legacy cellular network, a wireless local area network (WLAN) , etc.
  • LTE long term evolution
  • WLAN wireless local area network
  • the UE 110 may establish a connection with the 5G NR RAN 120. Therefore, the UE
  • the 5G NR RAN 120 may be a portion of a cellular network that may be deployed by a network carrier (e.g., Verizon, AT&T, T-Mobile, etc. ) .
  • the 5G NR RAN 120 may include base stations or access nodes (Node Bs, eNodeBs, HeNBs, eNBS, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) that are configured to send and receive traffic from UEs that are equipped with the appropriate cellular chip set.
  • the 5G NR RAN 120 deploys a gNB 120A.
  • the gNB 120A may be configured with multiple TRPs. Each TRP may represent one or more components configured to transmit and/or receive a signal.
  • multiple TRPs may be deployed locally at the gNB 120A.
  • multiple TRPs may be distributed at different locations and connected to the gNB 120A via a backhaul connection.
  • multiple small cells may be deployed at different locations and connected to the gNB 120A.
  • these examples are merely provided for illustrative purposes. Those skilled in the art will understand that TRPs are configured to be adaptable to a wide variety of different conditions and deployment scenarios.
  • any reference to a TRP being a particular network component or multiple TRPs being deployed in a particular arrangement is merely provided for illustrative purposes.
  • the TRPs described herein may represent any type of network component configured to transmit and/or receive a beam.
  • any association procedure may be performed for the UE 110 to connect to the 5G NR RAN 120.
  • the 5G NR RAN 120 may be associated with a particular cellular provider where the UE 110 and/or the user thereof has a contract and credential information (e.g., stored on a SIM card) .
  • the UE 110 may transmit the corresponding credential information to associate with the 5G NR RAN 120.
  • the UE 110 may associate with a specific base station, e.g., the gNB 120A.
  • the network arrangement 100 also includes a cellular core network 130, the Internet 140, an I P Multimedia Subsystem (IMS) 150, and a network services backbone 160.
  • the cellular core network 130 may refer an interconnected set of components that manages the operation and traffic of the cellular network. It may include the evolved packet core (EPC) and/or the 5G core (5GC) .
  • the cellular core network 130 also manages the traffic that flows between the cellular network and the Internet 140.
  • the IMS 150 may be generally described as an architecture for delivering multimedia services to the UE 110 using the IP protocol.
  • the IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide the multimedia services to the UE 110.
  • the network services backbone 160 is in communication either directly or indirectly with the Internet 140 and the cellular core network 130.
  • the network services backbone 160 may be generally described as a set of components (e.g., servers, network storage arrangements, etc. ) that implement a suite of services that may be used to extend the functionalities of the
  • Fig. 2 shows an exemplary UE 110 according to various exemplary embodiments.
  • the UE 110 will be described with regard to the network arrangement 100 of Fig. 1.
  • the UE 110 may include a processor 205, a memory arrangement 210, a display device 215, an input/output (I/O) device 220, a transceiver 225 and other components 230.
  • the other components 230 may include, for example, an audio input device, an audio output device, a power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, etc.
  • the processor 205 may be configured to execute a plurality of engines of the UE 110.
  • the engines may include a mTRP engine 235.
  • the mTRP engine 235 may perform various operations related to mTRP operation.
  • the mTRP engine 235 may perform operations such as, but not limited to, dynamically switching between mTRP mode and sTRP mode, updating a CC-group for mTRP operation and determining a default downlink beam/TCI-state for mTRP PDSCH reception.
  • the above referenced engine 235 being an application (e.g., a program) executed by the processor 205 is merely provided for illustrative purposes.
  • the functionality associated with the engine 235 may also be represented as a separate incorporated component of the UE 110 or may be a modular component coupled to the UE 110, e.g., an integrated circuit with or without firmware.
  • the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information.
  • the engine may also be embodied as one application or separate applications.
  • the functionality described for the processor 205 is split among two or more processors such as a baseband processor and an applications processor.
  • the exemplary embodiments may be implemented in any of these or other configurations of a UE.
  • the memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110.
  • the display device 215 may be a hardware component configured to show data to a user while the I/O device 220 may be a hardware component that enables the user to enter inputs.
  • the display device 215 and the I/O device 220 may be separate components or integrated together such as a touchscreen.
  • the transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, an LTE-RAN (not pictured) , a legacy RAN (not pictured) , a WLAN (not pictured) , etc. Accordingly, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) .
  • Fig. 3 shows an exemplary base station 300 according to various exemplary embodiments.
  • the base station 300 may represent the gNB 120A or any other type of access node through which the UE 110 may establish a connection and manage network operations.
  • the base station 300 may include a processor 305, a memory arrangement 310, an input/output (I/O) device 315, a transceiver 320, multiple TRPs 325 and other components 330.
  • the other components 330 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports to electrically connect the base station 300 to other electronic devices and/or power sources, TxRUs, transceiver chains, antenna elements, antenna panels, etc.
  • the multiple TRPs 325 may be deployed locally at the base station 300. In other scenarios, one or more of the multiple TRPs 325 may be deployed at physical locations remote from the base station 300 and connected to the base statin via a backhaul connection.
  • the base station 300 may be configured to control the multiple TRPs 325 and perform operations such as, but not limited to, assigning resources, configuring reference signals, implementing beam management techniques, etc.
  • the processor 305 may be configured to execute a plurality of engines for the base station 300.
  • the engines may include a mTRP engine 335.
  • the mTRP engine 335 may perform various operations related to mTRP operation.
  • the mTRP engine 335 may perform operations such as, but not limited to, transmitting a signal to trigger the UE 110 to dynamically switch between mTRP mode and sTRP mode, transmitting information to update a CC-group for mTRP operation and indicating a default downlink beam/TCI-state for mTRP PDSCH reception.
  • the above noted engine 335 being an application (e.g., a program) executed by the processor 305 is only exemplary.
  • the functionality associated with the engine 335 may also be represented as a separate incorporated component of the base station 300 or may be a modular component coupled to the base station 300, e.g., an integrated circuit with or without firmware.
  • the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information.
  • the functionality described for the processor 305 is split among a plurality of processors (e.g., a baseband processor, an applications processor, etc. ) .
  • the exemplary embodiments may be implemented in any of these or other configurations of a base station.
  • the memory 310 may be a hardware component configured to store data related to operations performed by the base station 300.
  • the I/O device 315 may be a hardware component or ports that enable a user to interact with the base station 300.
  • the transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UEs in the network arrangement 100.
  • the transceiver 320 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . Therefore, the transceiver 320 may include one or more components to enable the data exchange with the various networks and UEs.
  • a TCI state may indicate that a beam is quasi co-located to specific reference signal and define a search space.
  • the TCI state may indicate the location of one or more search spaces relative to one or more reference signals.
  • the UE 110 may be configured with multiple TCI states and the network may indicate which of the TCI states are to be used for subsequent communication.
  • a unified TCI state may be used for multiple channels simultaneously.
  • the network may configure a common TCI pool and then indicate one or more TCI states from the common TCI pool to be used for subsequent communication.
  • a unified TCI state may be commonly applied to downlink signals, e.g., reference signals, a control resource set (CORSET) , physical downlink shared channel (PDSCH) , etc.
  • a unified TCI state may be commonly applied to uplink signals, e.g., physical uplink shared channel (PUSCH) , physical uplink control channel (PUCCH) , sounding reference signals (SRS) , etc.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signals
  • a unified TCI state may be commonly applied for multiple uplink and downlink channels.
  • the exemplary embodiments may be applied to both the joint TCI state pool mechanisms and the separate TCI state pool mechanism.
  • the exemplary embodiments introduce techniques for dynamic switching between sTRP and mTRP operation.
  • Fig. 4 shows a method 400 for switching between sTRP and mTRP operation according to various exemplary embodiments.
  • the method 400 is described from the perspective of the UE 110 and is provided as a general overview of a scenario during which the exemplary techniques introduced herein may be utilized. Additional details regarding the exemplary techniques for dynamic switching between sTRP and mTRP will be provided below after the description of the method 400.
  • the UE 110 establishes a connection to the gNB 120A.
  • the UE 110 may receive configuration information that enables sTRP and/or mTRP operation.
  • the UE 110 may be configured with a joint TCI state pool, a downlink TCI state pool, an uplink TCI state pool and/or any other appropriate type of configuration information to enable communication between the UE 110 and the TRPs of the gNB 120A.
  • the UE 110 operates in a first TRP mode.
  • the first TRP mode may be either sTRP mode or mTRP mode.
  • sTRP mode the UE 110 may be configured to communicate with a single TRP of the gNB 120A.
  • mTRP mode the UE 110 may be configured to communicate with multiple TRPs of the gNB 120A.
  • the UE 110 receives a signal triggering a switch to a second TRP mode.
  • the signal may trigger a switch to mTRP mode.
  • the signal may trigger a switch to sTRP mode.
  • Specific examples of the type of signals that may be used to trigger the switch between sTRP mode and mTRP mode are provided below after the description of the method 400.
  • the UE 110 operates in the second TRP mode.
  • different TRP modes may be used for the uplink and downlink.
  • the UE 110 may use mTRP mode for downlink beam reception and sTRP for uplink beam transmission or vice versa.
  • the signal triggering the switch to the second TRP mode may be for both uplink and downlink communication.
  • the signal triggering the switch to the second TRP mode may be specific to downlink communication or uplink communication.
  • the signal triggering the switch between sTRP mode and mTRP mode may be downlink control information (DCI) .
  • DCI downlink control information
  • a switch may be triggered based on a number of unified TCI states indicated by the DCI.
  • the UE 110 may assume sTRP operation if a TCI field in DCI 1_1 and/or DCI 1_2 indicates a unified joint TCI state. Otherwise, the UE 110 may assume mTRP operation.
  • the UE 110 may assume sTRP operation if a TCI field in DCI 1_1 and/or DCI 1_2 indicates a single unified downlink TCI state, a single unified uplink TCI state or a pair of unified downlink TCI state and a unified uplink TCI state. Otherwise, the UE 110 may assume mTRP operation.
  • the exemplary embodiments introduce a mode indicator field for DCI that is configured to trigger dynamic switching between sTRP and mTRP operation.
  • the exemplary mode indicator field may comprise one or more bits and be added to DCI 1_1, DCI 1_2 or any other appropriate type of DCI.
  • the mode indicator field may comprise one bit where a first value (e.g., 0) triggers sTRP operation and a second value (e.g., 1) triggers mTRP operation.
  • a first value e.g., 0
  • a second value e.g., 1
  • the mode indicator field may comprise two bits where a most significant bit (MSB) set to a first value (e.g., 0) may trigger sTRP operation for the downlink and the MSB set to a second value (e.g., 1) may trigger mTRP operation for the downlink.
  • MSB most significant bit
  • a least significant bit (LSB) set to a first value may trigger sTRP operation for the uplink and the LST set to a second value (e.g., 1) may trigger mTRP operation for the uplink.
  • LSB least significant bit
  • the mode indicator field may be used for switching between sTRP and mTRP for both uplink and downlink operations.
  • the mode indicator field may comprise one bit where a first value (e.g., 0) triggers sTRP mode for both the uplink and the downlink and a second value (e.g., 1) triggers mTRP mode for both the uplink and the downlink.
  • the exemplary embodiments introduce activation MAC CEs that may be provided to the UE 110 to activate or deactivate multiple TCI states.
  • the UE 110 may be configured with multiple unified TCI states by the network (e.g., 405) .
  • the UE 110 may then enter sTRP mode (e.g., first TRP mode 410) .
  • sTRP mode e.g., first TRP mode 410
  • the network may activate or deactivate a particular TCI state using the exemplary MAC CEs introduced herein.
  • the UE 110 may receive DCI triggering the UE 110 to dynamically switch between sTRP mode and mTRP mode (e.g., 415) .
  • the UE 110 may then enter mTRP mode (e.g., second TRP mode 420) .
  • mTRP mode e.g., second TRP mode 420
  • the network may activate or deactivate a particular TCI state using the exemplary MAC CEs introduced herein.
  • the above example is not intended to limit the exemplary embodiments in any way and is merely provided to illustrate a scenario in which the exemplary MAC CEs introduced herein may be utilized. Additional details regarding the exemplary MAC CEs are provided in below.
  • the following exemplary MAC CEs may be used for activation and deactivation of multiple TCI states for uplink and downlink operations.
  • a set of multiple TCI states may be referred to as a TCI state list.
  • the exemplary MAC CEs may activate/deactivate different TCI state lists.
  • TCI state list is merely provided for illustrative purposes, different entities may refer to a similar concept by a different name.
  • Fig. 5 shows an example 500 of the relationship between DCI, MAC CEs and TCI state lists according to various exemplary embodiments.
  • the example 500 includes a table 510 with a mode indicator field column 512 and a TRP mode field column 516.
  • the mode indicator field column 512 shows that when the mode indicator field of DCI is set to a first value (e.g., 0) , the TRP mode to be used by the UE 110 is sTRP mode and when the mode indicator field of DCI is set to a second value (e.g., 1) , the TRP mode to be used by the UE 110 is mTRP mode.
  • the DCI may include a TRP index value indicating which TRP is to be used for TRP mode.
  • TRP index field column 514 Each TRP is associated with a different TCI state list.
  • TRP index 0 align with a first TCI state list in the TCI state list column 518
  • TRP index 1 align with a second TCI state list in the TCI state list column 518.
  • the TCI state list for mTRP operation may be associated with a single TCI state list that is used for both TRPs.
  • the TCI state list for mTRP operation may be a concatenation of the first TCI state list and the second TCI state list.
  • each TCI state is identified by (x, y) where (x) is a TCI state list index value identifying a particular TCI state list and (y) is an index value identifying an order of TCI states within a same TCI state list.
  • the example 500 is merely provided for illustrative purposes and is not intended to limit the exemplary embodiments in any way.
  • the exemplary embodiments may utilize any appropriate number of TCI state lists and TCI states within a TCI state list. It should also be understood that TCI state lists and their corresponding TCI states may be identified in any appropriate manner and reference to (x, y) is one non-limiting example of how different TCI state lists and TCI states may be differentiated from one another.
  • a mode indicator field of DCI may have one bit where a first value (e.g., 0) triggers sTRP mode and a second value (e.g., 1) triggers mTRP mode.
  • the TRP index of DCI may also have one bit where a first value (e.g., 0) identifies a first TRP associated with a first TCI state list (e.g., TCI state list #1) and a second value (e.g., 1) identifies a second TRP associated with a second TCI state list (e.g., TCI state list #2) .
  • a first exemplary MAC CE may be used for activation and deactivation of unified TCI states associated with a first TRP in sTRP mode. For example, MAC CE #1 may activate or deactivate TCI state list #1 to be used for downlink and uplink operation by the first TRP.
  • a field of MAC CE #1 may be set to a first value (e.g., 0) to indicate that the MAC CE is for the first TRP.
  • a second exemplary MAC CE may be used for activation and deactivation of unified TCI states associated with a second TRP in sTRP mode.
  • MAC CE #2 may activate or deactivate TCI state list #2 to be used for downlink and uplink operation by the second TRP.
  • a field of MAC CE #2 may be set to a second value (e.g., 1) to indicate that the MAC CE is for the second TRP.
  • a third exemplary MAC CE may be used for activation and deactivation of unified TCI states for both the first TRP and second TRP in mTRP mode.
  • MAC CE #3 may activate or deactivate TCI state list #3 to be used for downlink and uplink operation by both the first and second TRP.
  • This type of exemplary MAC CE may be identified by a MAC sub header with a dedicated extended logical channel ID (eLCID) .
  • eLCID dedicated extended logical channel ID
  • a fourth exemplary MAC CE may be used for activation and deactivation of unified TCI states for mTRP mode.
  • MAC CE #4 may be used instead of or in addition to MAC CE #3.
  • MAC CE #4 may activate and deactivate a TCI state list #4 configured for mTRP operation and comprising a concatenation of TCI state list #1 and TCI state list #2.
  • the exemplary embodiments introduce techniques for CC-group based unified TCI state update for mTRP operation.
  • the exemplary techniques relate to a carrier aggregation (CA) scenario where one or more cells are configured for sTRP operation and/or mTRP operation.
  • CA carrier aggregation
  • a list of serving cells may be grouped together and updated simultaneously for TCI relations.
  • CC-group based unified TCI state update may be performed if all of the serving cells are configured with a same TRP mode (e.g., sTRP mode, single DCI (sDCI) mTRP or multi-DCI (mDCI) mTRP mode) .
  • TRP mode e.g., single DCI (sDCI) mTRP or multi-DCI (mDCI) mTRP mode
  • CCs of serving cells configured with a same TRP mode may be grouped together to perform the CC-group based unified TCI state update.
  • DCI may then be used to update the TCI state for CCs of cells configured with a same TRP mode.
  • a field in DCI may indicate a TCI state update for CCs of cells configured in sTRP mode.
  • a field in DCI may indicate a TCI state update for CCs of cells configured for sDCI mTRP mode.
  • a field in DCI may indicate a TCI state update for CCs of cells configured for mDCI mTRP mode.
  • CC-group based unified TCI state update may be performed if all of the serving cells are configured with either sTRP mode or sDCI mTRP mode.
  • an updated TCI state ID indicated by the TCI field in DCI on a CC may be commonly applied across all CCs in a same group.
  • an indicator information element (IE) may be provided by radio resource control (RRC) signaling to indicate which one of two unified TCI state pairs corresponding to a reference CC configured for mTRP mode is to be applied to the other CCs in same group.
  • RRC radio resource control
  • a one-bit indicator IE may be used where a first value (e.g., 1) means that the CC-group follows the first pair of TCI states and a second value (e.g., 0) means that the CC-group follows the second pair of TCI states.
  • a first value e.g., 1
  • a second value e.g., 0
  • Fig. 6 shows a deployment scenario 600 according to various exemplary embodiments.
  • the deployment scenario 600 is provided as a non-limiting example to demonstrate a scenario during which the exemplary CC-group based unified TCI update techniques introduced herein may be utilized.
  • the deployment scenario 600 includes five CCs (CC #1, CC #2, CC #3, CC #4, CC #5) .
  • CC #1 is configured for mTRP mode comprising TRP #1 and TRP #2.
  • the other CCs e.g., CC #2-CC #5 are configured for sTRP mode.
  • CC #1-CC #5 and TRP #1 and TRP #2 is merely provided for illustrative purposes.
  • the exemplary embodiments are not limited to any particular number of cells, CCs or TRPs and may be used by any appropriate number of cells, CCs and/or TRPs.
  • the CCs may be grouped into three lists for CC-group based unified TCI updates.
  • List 1 may include CC #1 configured for mTRP mode with TRP #1 and TRP #2.
  • List 2 may include CC #2 and CC #3 which are each configured for sTRP mode with TRP #1.
  • List 3 may include CC #4 and CC #5 which are each configured for sTRP mode with TRP #2.
  • the network may update the TCI state to be used for the CCs of each list using DCI.
  • a field in DCI may indicate a TCI state update for CCs of list 1.
  • a field in DCI may indicate a TCI state update for CCs of list 2.
  • a field in DCI may indicate a TCI state update for CCs of list 3.
  • Fig. 7 shows a deployment scenario 700 according to various exemplary embodiments.
  • the deployment scenario 700 is provided as a non-limiting example to demonstrate a scenario during which the exemplary CC-group based unified TCI update techniques introduced herein may be utilized.
  • the deployment scenario 700 includes five CCs (CC #1, CC #2, CC #3, CC #4, CC #5) .
  • CC #1 is configured for mTRP mode comprising TRP #1 and TRP #2.
  • the other CCs e.g., CC #2-CC #5 are configured for sTRP mode.
  • CC #1-CC #5 and TRP #1 and TRP #2 is merely provided for illustrative purposes.
  • the exemplary embodiments are not limited to any particular number of cells, CCs or TRPs and may be used by any appropriate number of cells, CCs and/or TRPs
  • the CCs may be grouped into two lists for CC-group based unified TCI state updates.
  • List 1 may include CC #1 configured for mTRP mode, CC #2 configured for sTRP mode and CC #3 configured for sTRP mode.
  • List 2 may include CC #1 configured for mTRP mode, CC #4 configured for sTRP mode and CC #5 configured for sTRP mode.
  • CC #1 is configured as the reference CC for list 1 and list 2.
  • the indicated unified TCI states for CC #1 with mTRP mode is assumed to be two pairs of downlink/uplink TCI states. Pair #1 includes a first downlink TCI state and a first uplink TCI state for TRP #1 and Pair #2 includes a second downlink TCI state and a second uplink TCI state.
  • the UE 110 may receive a RRC message comprising an indicator IE that is configured to indicate which TCI pair list 1 is to follow for the TCI update.
  • an indicator IE that is configured to indicate which TCI pair list 1 is to follow for the TCI update.
  • the indicator IE is set to a first value (e.g., 0)
  • CC #2 and CC #3 of list 1 are to be updated in accordance with the TCI state ID indicated by a TCI filed in subsequently received DCI for pair #1 of CC #1.
  • a second value e.g., 1
  • CC #2 and CC #3 of list 1 are to be updated in accordance with the TCI state ID indicated by a TCI filed in subsequently received DCI for pair #2 of CC #1.
  • the network may send DCI to the UE 110 for a TCI state update.
  • the DCI may include a TCI state ID for pair #1 of CC#1 which is to be commonly applied across all CCs in list 1.
  • the TCI update for pair #1 may include a downlink TCI state ID (#2) and an uplink TCI state ID (#5) for TRP #1 of CC #1.
  • the UE 110 may apply TCI state #2 for downlink operations on CC #1, CC #2 and CC #3 and apply TCI state #5 for uplink operations CC #1, CC #2 and CC #3.
  • the indicator IE in an RRC message may indicate that CC #4 and CC #5 of list 2 are to be updated in accordance with pair #2 of TRP #2 for CC #1.
  • the network may then send DCI to the UE 110 for a TCI state update that includes a TCI state ID for pair #2 of TRP #2 for CC#1 which is to be commonly applied across all CCs in list 2.
  • the TCI update for pair #2 may include a downlink TCI state ID (#3) and an uplink TCI state ID (#9) for TRP #2 of CC #1.
  • the UE 110 may apply TCI state #3 for downlink operations on CC #1, CC #4 and CC #5 and apply TCI state #9 for uplink operations CC #1, CC #2 and CC #3.
  • the exemplary embodiments introduce techniques for determining a default beam or TCI-states for mTRP PDSCH reception.
  • the exemplary techniques are described below with regard to three different exemplary scenarios during which a default beam or TCI state may be utilized.
  • a default beam or TCI state may be used when the indicator field in DCI format 1_1 or 1_2 for TCI state selection is not present based on RRC configuration.
  • a default beam or TCI state may be used when DCI 1_0 is received without a TCI field.
  • a default beam or TCI state may be used for PDSCH reception if the offset between the reception of the DCI format 1_1 or 1_2 and the corresponding PDSCH reception is less than a threshold value.
  • the default beam or TCI state may be explicitly configured by RRC signaling as either the first joint or downlink unified TCI state, the second joint or downlink unified TCI state or both of the indicated joint or downlink unified TCI states.
  • the default beam or TCI state for PDSCH reception may be predefined and hard encoded in 3GPP specifications.
  • the UE 110 may apply the indicated unified TCI states if the control resource set (CORESET) is configured to follow the unified TCI state. Otherwise, the TCI state of the CORESET may be applied as the default beam or TCI state. In another approach, if the indicated TCI codepoint has two j oint or downlink TCI states, they may be used as the default beam or TCI state. Otherwise, the two joint or downlink TCI states mapped to the smallest TCI codepoint value or with the lowest TCI state ID may be used as the default beam or TCI state.
  • the default beam may be continuously applied for PDSCH reception even after the threshold offset relative to the ending symbol of the PDCCH.
  • the UE 110 should follow the TCI state in the PDCCH after the threshold offset relative to the ending symbol of the PDCCH.
  • the network may explicitly configure the default beam or TCI state by RRC signaling. If for any of a variety of different reasons, the network does not use this approach, the UE 110 may apply the indicated unified TCI states if the CORESET is configured to follow the unified TCI state. Otherwise, the TCI state of the CORESET may be applied as the default beam or TCI state.
  • Different UE capabilities corresponding to the above approaches may be defined to provide flexibility for UE implementation.
  • the network may explicitly configure the default beam or TCI state by RRC signaling for scenario 1 where a default beam or TCI state may be used when the indicator filed in DCI format 1_1 or 1_2 for TCI state selection is not present based on RRC configuration.
  • scenario 2 occurs where a default beam or TCI state may be used when DCI 1_0 is received without a TCI field, the default beam or TCI state for PDSCH reception may be predefined and hard encoded in 3GPP specifications.
  • Fig. 8 shows an example 800 for TCI state determination for default beams or TCI states according to various exemplary embodiments.
  • the example 800 it is assumed that four unified TCI state pairs are activated by a MAC CE and associated with different TCI codepoints.
  • TCI codepoint 000 may be associated with TCI state 1 (serving cell)
  • TCI codepoint 001 may be associated with TCI state 2 (serving cell) and TCI state 4 (non-serving cell)
  • TCI codepoint 010 may be associated with TCI state 3 (serving cell) and TCI state 6 (non-serving cell)
  • TCI codepoint 011 may be associated with TCI state 5 (non-serving cell) and TCI state 8 (non-serving cell) .
  • the UE 110 may assume different default TCI states for PDSCH reception or buffering during a default QCL window.
  • TCI state 1 is used for the DCI and the indicated downlink unified TCI states are TCI states 3 and 6.810-840 show which TCI state may be the default TCI state when using each of the respective approaches described above.
  • the default beam or TCI state may be explicitly configured by RRC signaling as either the first joint/downlink unified TCI state, the second joint/downlink unified TCI state or both of the indicated joint/downlink unified TCI states.
  • the first TCI state is configured by RRC signaling and thus, TCI state 3 may be used as the default TCI state.
  • the default beam or TCI state for PDSCH reception may be predefined and hard encoded in 3GPP specifications.
  • TCI state 3 may be used as the default TCI state.
  • the UE 110 may apply the indicated unified TCI states if the CORESET is configured to follow the unified TCI state. Otherwise, the TCI state of the CORESET may be applied as the default beam or TCI state. In the example 800, it may be considered that the CORESET is configured not to follow unified TCI state and TCI state 2 is associated with the CORESET and thus, TCI state 2 may be used as the default TCI state.
  • the indicated TCI codepoint may be used as the default beam or TCI state. Otherwise, the two joint or downlink TCI states mapped to the smallest TCI codepoint value or with the lowest TCI state ID may be used as the default beam or TCI state. In the example 800, since TCI states 3 and 6 are indicated the indicated TCI states, TCI states 3 and 6 may be used as the default TCI states.
  • a method is performed by a base station configured with multiple transmission reception points (TRPs) , comprising establishing a connection to a user equipment (UE) , transmitting a signal to the UE configured to trigger the UE a switch from a first TRP mode to a second TRP mode, wherein when the first TRP mode is a multi-TRP (mTRP) mode, then the second TRP mode if a single TRP (sTRP) mode, and when the first TRP mode if the sTRP mode, then the second TRP mode if the mTRP mode and communicating with the UE when the UE is in the second TRP mode.
  • TRPs transmission reception points
  • the method of the first example wherein the signal is downlink control information (DCI) and the switch from the first TRP mode to the second TRP mode is based on a number of unified transmission configuration indicator (TCI) states indicated by a TCI field in the DCI.
  • DCI downlink control information
  • TCI transmission configuration indicator
  • the method of the second example wherein when the first TRP mode is the mTRP mode, the second TRP mode is the sTRP mode and the UE is configured with joint TCI-state operation for downlink and uplink, the switch to sTRP mode is based on the DCI comprising a single unified joint TCI state.
  • the method of the second example wherein when the first TRP mode is the mTRP mode, the second TRP mode is the sTRP mode and the UE is configured with separate unified downlink and uplink TCI state operation, the switch to the sTRP mode is based on the DCI comprising a pair of TCI states including a downlink unified TCI state and an uplink unified TCI state.
  • the method of the second example wherein when the first TRP mode is the mTRP mode, the second TRP mode is the sTRP mode and the UE is configured with separate unified downlink and uplink TCI state operation, the switch to the sTRP mode is based on the DCI comprising a single downlink unified TCI state or a single uplink unified TCI state.
  • the method of the second example wherein when the first TRP mode is the sTRP mode and the second TRP mode is the mTRP mode and the UE is configured for joint TCI-state operation, the switch to the mTRP mode is based on the DCI comprising two joint unified TCI states.
  • the switch to the mTRP mode is based on the DCI comprising four downlink and uplink unified TCI states TCI states.
  • DCI downlink control information
  • the mode indicator field comprises one bit configured to indicate either single TRP (sTRP) mode or multi-TRP (mTRP) mode for both downlink and uplink communication, or two bits, a first bit configured to indicate either the sTRP mode or the mTRP mode for downlink communication and a second bit configured to indicate either the sTRP mode or the mTRP mode for uplink communication.
  • sTRP single TRP
  • mTRP multi-TRP
  • the method of the first example further comprising transmitting, when the UE is in the second TRP mode, a first medium access control (MAC) control element (CE) to the UE, wherein the second TRP mode is single TRP (sTRP) mode and the first MAC CE is configured to activate a set of unified transmission configuration indicator (TCI) states associated with a first TRP of the base station.
  • MAC medium access control
  • CE control element
  • the method of the tenth example further comprising transmitting, when the UE is in the second TRP mode, a second MAC CE to the UE, wherein the second MAC CE is configured to activate a set of unified TCI states associated with a second TRP of the base station.
  • the method of the first example further comprising transmitting, when the UE is in the second TRP mode, a first medium access control (MAC) control element (CE) to the UE, wherein the second TRP mode is multi-TRP (mTRP) mode and the first MAC CE is configured to activate unified transmission configuration indicator (TCI) states for both a first TRP and a second TRP of the base station.
  • MAC medium access control
  • CE control element
  • the method of the first example further comprising transmitting, when the UE is in the second TRP mode, a first DCI format to the UE, wherein when the second TRP mode is the sTRP mode and the first DCI format comprises a TRP index field configured to indicate one of multiple different TCI state lists to be used for the sTRP mode.
  • a method is performed by a user equipment (UE) , comprising receiving downlink control information (DCI that indicates a first transmission configuration indicator (TCI) state and a second TCI state, identifying a condition during which a default TCI state is to be used for physical downlink shared channel (PDSCH) reception, wherein the default TCI state comprises the first TCI state, the second TCI state or both the first and second TCI states and receiving PDSCH using the default TCI state.
  • DCI downlink control information
  • TCI transmission configuration indicator
  • PDSCH physical downlink shared channel
  • identifying the condition includes identifying that an indicator field in DCI format 1_1 or DCI format 1_2 for TCI state selection is not present based on radio resource control (RRC) configuration.
  • RRC radio resource control
  • the method of the fifteenth example wherein the default TCI state is continuously applied for PDSCH reception after a threshold offset relative to an ending symbol of a physical downlink control channel (PDCCH) .
  • PDCH physical downlink control channel
  • identifying the condition includes identifying DCI format 1_0 without a TCI field.
  • the method of the seventeenth example wherein the default TCI state is continuously applied for PDSCH reception after a threshold offset relative to an ending symbol of a physical downlink control channel (PDCCH) .
  • PDCH physical downlink control channel
  • identifying the condition includes identifying that an offset between PDSCH reception and a DCI reception that schedules the PDSCH is less than a threshold value.
  • the method of the fourteenth example wherein the default TCI state is configured by radio resource control (RRC) signaling.
  • RRC radio resource control
  • the method of the twentieth example wherein the RRC signaling is configured to indicate that the default TCI state is to be either i) the first TCI state, ii) the second TCI state or iii) both the first TCI state and the second TCI state.
  • identifying the condition comprises identifying that a control resource set (CORESET) is configured not to follow a unified TCI state and wherein the default TCI state is the TCI state that is associated with the CORESET.
  • CORESET control resource set
  • identifying the condition comprises determining that an indicated TCI codepoint has two joint or downlink TCI states and the default TCI state is both the first TCI state and the second TCI state.
  • the method of the fourteenth example wherein the de fault TCI state comprises two joint or downlink TCI states that are mapped to a smallest TCI codepoint value.
  • the method of the fourteenth example wherein the default TCI state comprises two joint or downlink TCI states with a lowest TCI state ID.
  • An exemplary hardware platform for implementing the exemplary embodiments may include, for example, an Intel x86 based platform with compatible operating system, a Windows OS, a Mac platform and MAC OS, a mobile device having an operating system such as iOS, Android, etc.
  • the exemplary embodiments described above may be embodied as a program containing lines of code stored on a non-transitory computer readable storage medium that, when compiled, may be executed on a processor or microprocessor.
  • personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users.
  • personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.

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Abstract

Un équipement utilisateur (UE) est conçu pour établir une connexion à une station de base configurée avec de multiples points d'émission et de réception (TRP), recevoir un signal provenant de la station de base configuré pour déclencher un commutateur d'un premier mode TRP à un second mode TRP, lorsque le premier mode TRP est un mode multi-TRP (mTRP), le second mode TRP étant un mode TRP unique (sTRP), et lorsque le premier mode TRP est le mode sTRP, le second mode TRP étant le mode mTRP et communiquant avec la station de base à l'aide du second mode TRP.
PCT/CN2023/075677 2023-02-13 2023-02-13 Améliorations pour prendre en charge une opération multi-trp Ceased WO2024168467A1 (fr)

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CN202380093998.1A CN120642519A (zh) 2023-02-13 2023-02-13 支持多trp操作的增强

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200045700A1 (en) * 2018-08-03 2020-02-06 Qualcomm Incorporated Configuring a user equipment to operate in a transmission/reception point (trp) mode
WO2022082653A1 (fr) * 2020-10-22 2022-04-28 北京小米移动软件有限公司 Procédé et appareil de transmission de données
WO2022104797A1 (fr) * 2020-11-23 2022-05-27 北京小米移动软件有限公司 Procédé et appareil de transmission
WO2022205229A1 (fr) * 2021-03-31 2022-10-06 北京小米移动软件有限公司 Procédé et dispositif de communication utilisés pour pusch, et support d'enregistrement
WO2022205233A1 (fr) * 2021-03-31 2022-10-06 北京小米移动软件有限公司 Procédé de communication pour un pusch, appareil de communication pour un pusch et support d'enregistrement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200045700A1 (en) * 2018-08-03 2020-02-06 Qualcomm Incorporated Configuring a user equipment to operate in a transmission/reception point (trp) mode
WO2022082653A1 (fr) * 2020-10-22 2022-04-28 北京小米移动软件有限公司 Procédé et appareil de transmission de données
WO2022104797A1 (fr) * 2020-11-23 2022-05-27 北京小米移动软件有限公司 Procédé et appareil de transmission
WO2022205229A1 (fr) * 2021-03-31 2022-10-06 北京小米移动软件有限公司 Procédé et dispositif de communication utilisés pour pusch, et support d'enregistrement
WO2022205233A1 (fr) * 2021-03-31 2022-10-06 北京小米移动软件有限公司 Procédé de communication pour un pusch, appareil de communication pour un pusch et support d'enregistrement

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