WO2024168685A1 - Gestion de synchronisation de transmission en liaison montante dans un fonctionnement à plusieurs trp - Google Patents

Gestion de synchronisation de transmission en liaison montante dans un fonctionnement à plusieurs trp Download PDF

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Publication number
WO2024168685A1
WO2024168685A1 PCT/CN2023/076445 CN2023076445W WO2024168685A1 WO 2024168685 A1 WO2024168685 A1 WO 2024168685A1 CN 2023076445 W CN2023076445 W CN 2023076445W WO 2024168685 A1 WO2024168685 A1 WO 2024168685A1
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WIPO (PCT)
Prior art keywords
event
base station
trps
processor
ttd
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PCT/CN2023/076445
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English (en)
Inventor
Qiming Li
Hong He
Yang Tang
Jie Cui
Manasa RAGHAVAN
Naveen Kumar R. PALLE VENKATA
Dawei Zhang
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.)
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Application filed by Apple Inc. filed Critical Apple Inc.
Priority to PCT/CN2023/076445 priority Critical patent/WO2024168685A1/fr
Publication of WO2024168685A1 publication Critical patent/WO2024168685A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present application relates generally to wireless communication systems, including providing uplink transmission timing management in multi-Transmit Receive Point (TRP) operation.
  • TRP Receive Point
  • Wireless mobile communication technology uses various standards and protocols to transmit data between a base station and a wireless communication device.
  • Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) long term evolution (LTE) (e.g., 4G) , 3GPP new radio (NR) (e.g., 5G) , and IEEE 802.11 standard for wireless local area networks (WLAN) (commonly known to industry groups as ) .
  • 3GPP 3rd Generation Partnership Project
  • LTE long term evolution
  • NR 3GPP new radio
  • WLAN wireless local area networks
  • 3GPP radio access networks
  • RANs can include, for example, global system for mobile communications (GSM) , enhanced data rates for GSM evolution (EDGE) RAN (GERAN) , Universal Terrestrial Radio Access Network (UTRAN) , Evolved Universal Terrestrial Radio Access Network (E-UTRAN) , and/or Next-Generation Radio Access Network (NG-RAN) .
  • GSM global system for mobile communications
  • EDGE enhanced data rates for GSM evolution
  • GERAN GERAN
  • UTRAN Universal Terrestrial Radio Access Network
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • NG-RAN Next-Generation Radio Access Network
  • Each RAN may use one or more radio access technologies (RATs) to perform communication between the base station and the UE.
  • RATs radio access technologies
  • the GERAN implements GSM and/or EDGE RAT
  • the UTRAN implements universal mobile telecommunication system (UMTS) RAT or other 3GPP RAT
  • the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE)
  • NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR)
  • the E-UTRAN may also implement NR RAT.
  • NG-RAN may also implement LTE RAT.
  • a base station used by a RAN may correspond to that RAN.
  • E-UTRAN base station is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB) .
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • eNodeB enhanced Node B
  • NG-RAN base station is a next generation Node B (also sometimes referred to as a or g Node B or gNB) .
  • a RAN provides its communication services with external entities through its connection to a core network (CN) .
  • CN core network
  • E-UTRAN may utilize an Evolved Packet Core (EPC)
  • EPC Evolved Packet Core
  • NG-RAN may utilize a 5G Core Network (5GC) .
  • EPC Evolved Packet Core
  • 5GC 5G Core Network
  • an apparatus of a user equipment comprising: a processor; and a memory storing instructions that, when executed by the processor, configure the apparatus to: monitor a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) ; determine a first event that the TTD or the RTD is not beyond a respective threshold related to the UE’s capability, or a second event that the TTD or the RTD is beyond the respective threshold; and enable two or more Timing Advance Groups (TAGs) for the multiple TRPs in the first event, or a single TAG for the multiple TRPs in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • TRPs Transmit Receive Points
  • an apparatus of a base station comprising: a processor; and a memory storing instructions that, when executed by the processor, configure the apparatus to: receive, from a UE, a report for a first event that a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) is not beyond a respective threshold related to the UE’s capability, or for a second event that the TTD or the RTD is beyond the respective threshold; and send, to the UE, two or more Timing Advance (TA) values for two or more Timing Advance Group (TAGs) enabled for the multiple TRPs in the first event, or one TA value for a single TAG enabled in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • a method comprising: monitoring a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) ; determining a first event that the TTD or the RTD is not beyond a respective threshold related to the UE’s capability, or a second event that the TTD or the RTD is beyond the respective threshold; and enabling two or more Timing Advance Groups (TAGs) for the multiple TRPs in the first event, or a single TAG for the multiple TRPs in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • TRPs Transmit Receive Points
  • a method comprising: receiving, from a UE, a report for a first event that a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) is not beyond a respective threshold related to the UE’s capability, or for a second event that the TTD or the RTD is beyond the respective threshold; and sending, to the UE, two or more Timing Advance (TA) values for two or more Timing Advance Group (TAGs) enabled for the multiple TRPs in the first event, or one TA value for a single TAG enabled in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • FIG. 1 illustrates an example architecture of a wireless communication system, according to some aspects of the present application.
  • FIG. 2 illustrates a system for performing signaling between a wireless device and a network device, according to some aspects of the present application.
  • FIG. 3 illustrates an example scenario of multi-TRP transmissions according to some aspects of the present application.
  • FIG. 4 is a diagram illustrating a frame structure in 5G NR.
  • FIG. 5 is a diagram illustrating a timing relation between uplink and downlink.
  • FIG. 6 illustrates an example of RTD/TTD thresholds according to some aspects of the present application.
  • FIGS. 7A and 7B illustrate examples of TAG configuration for multi-TRP operation according to some aspects of the present application.
  • FIGS. 8A and 8B illustrate examples of multi-TRP in different events according to some aspects of the present application.
  • FIG. 9 is a flowchart diagram illustrating an example method for supporting the multi-TRP operation according to some aspects of the present application.
  • FIG. 10 is a flowchart diagram illustrating an example method for supporting the multi-TRP operation according to some aspects of the present application.
  • a UE may include a mobile device, a personal digital assistant (PDA) , a tablet computer, a laptop computer, a personal computer, an Internet of Things (IoT) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
  • PDA personal digital assistant
  • IoT Internet of Things
  • MTC machine type communications
  • base station various embodiments are described with regard to a “base station” .
  • reference to a base station is merely provided for illustrative purposes.
  • the term “base station” as used in the present application is an example of a control device in a wireless communication system, with its full breadth of ordinary meaning.
  • the "base station” may also be, for example, an eNB in the LTE communication system, a remote radio head, a wireless access point, a relay node, a drone control tower, or any communication device or an element thereof for performing a similar control function.
  • FIG. 1 illustrates an example architecture of a wireless communication system 100, according to embodiments disclosed herein.
  • the following description is provided for an example wireless communication system 100 that operates in conjunction with the LTE system standards and/or 5G or NR system standards as provided by 3GPP technical specifications.
  • the wireless communication system 100 includes UE 102 and UE 104 (although any number of UEs may be used) .
  • the UE 102 and the UE 104 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks) , but may also comprise any mobile or non-mobile computing device configured for wireless communication.
  • the UE 102 and UE 104 may be configured to communicatively couple with a RAN 106.
  • the RAN 106 may be NG-RAN, E-UTRAN, etc.
  • the UE 102 and UE 104 utilize connections (or channels) (shown as connection 108 and connection 110, respectively) with the RAN 106, each of which comprises a physical communications interface.
  • the RAN 106 can include one or more base stations, such as base station 112 and base station 114, that enable the connection 108 and connection 110.
  • connection 108 and connection 110 are air interfaces to enable such communicative coupling, and may be consistent with RAT (s) used by the RAN 106, such as, for example, an LTE and/or NR.
  • the UE 102 and UE 104 may also directly exchange communication data via a sidelink interface 116.
  • the UE 104 is shown to be configured to access an access point (shown as AP 118) via connection 120.
  • the connection 120 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.11 protocol, wherein the AP 118 may comprise a router.
  • the AP 118 may be connected to another network (for example, the Internet) without going through a CN 124.
  • the UE 102 and UE 104 can be configured to communicate using orthogonal frequency division multiplexing (OFDM) communication signals with each other or with the base station 112 and/or the base station 114 over a multicarrier communication channel in accordance with various communication techniques, such as, but not limited to, an orthogonal frequency division multiple access (OFDMA) communication technique (e.g., for downlink communications) or a single carrier frequency division multiple access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications) , although the scope of the embodiments is not limited in this respect.
  • OFDM signals can comprise a plurality of orthogonal subcarriers.
  • the base station 112 or base station 114 may be implemented as one or more software entities running on server computers as part of a virtual network.
  • the base station 112 or base station 114 may be configured to communicate with one another via interface 122.
  • the interface 122 may be an X2 interface.
  • the X2 interface may be defined between two or more base stations (e.g., two or more eNBs and the like) that connect to an EPC, and/or between two eNBs connecting to the EPC.
  • the interface 122 may be an Xn interface.
  • the Xn interface is defined between two or more base stations (e.g., two or more gNBs and the like) that connect to 5GC, between a base station 112 (e.g., a gNB) connecting to 5GC and an eNB, and/or between two eNBs connecting to 5GC (e.g., CN 124) .
  • the RAN 106 is shown to be communicatively coupled to the CN 124.
  • the CN 124 may comprise one or more network elements 126, which are configured to offer various data and telecommunications services to customers/subscribers (e.g., users of UE 102 and UE 104) who are connected to the CN 124 via the RAN 106.
  • the components of the CN 124 may be implemented in one physical device or separate physical devices including components to read and execute instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) .
  • the CN 124 may be an EPC, and the RAN 106 may be connected with the CN 124 via an S1 interface 128.
  • the S1 interface 128 may be split into two parts, an S1 user plane (S1-U) interface, which carries traffic data between the base station 112 or base station 114 and a serving gateway (S-GW) , and the S1-MME interface, which is a signaling interface between the base station 112 or base station 114 and mobility management entities (MMEs) .
  • S1-U S1 user plane
  • S-GW serving gateway
  • MMEs mobility management entities
  • the CN 124 may be a 5GC, and the RAN 106 may be connected with the CN 124 via an NG interface 128.
  • the NG interface 128 may be split into two parts, an NG user plane (NG-U) interface, which carries traffic data between the base station 112 or base station 114 and a user plane function (UPF) , and the S1 control plane (NG-C) interface, which is a signaling interface between the base station 112 or base station 114 and access and mobility management functions (AMFs) .
  • NG-U NG user plane
  • UPF user plane function
  • S1 control plane S1 control plane
  • AMFs access and mobility management functions
  • an application server 130 may be an element offering applications that use internet protocol (IP) bearer resources with the CN 124 (e.g., packet switched data services) .
  • IP internet protocol
  • the application server 130 can also be configured to support one or more communication services (e.g., VoIP sessions, group communication sessions, etc. ) for the UE 102 and UE 104 via the CN 124.
  • the application server 130 may communicate with the CN 124 through an IP communications interface 132.
  • FIG. 2 illustrates a system 200 for performing signaling 234 between a wireless device 202 and a network device 218, according to embodiments disclosed herein.
  • the system 200 may be a portion of a wireless communications system as herein described.
  • the wireless device 202 may be, for example, a UE of a wireless communication system.
  • the network device 218 may be, for example, a base station (e.g., an eNB or a gNB) of a wireless communication system.
  • the wireless device 202 may include one or more processor (s) 204.
  • the processor (s) 204 may execute instructions such that various operations of the wireless device 202 are performed, as described herein.
  • the processor (s) 204 may include one or more baseband processors implemented using, for example, a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • CPU central processing unit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the wireless device 202 may include a memory 206.
  • the memory 206 may be a non-transitory computer-readable storage medium that stores instructions 208 (which may include, for example, the instructions being executed by the processor (s) 204) .
  • the instructions 208 may also be referred to as program code or a computer program.
  • the memory 206 may also store data used by, and results computed by, the processor (s) 204.
  • the wireless device 202 may include one or more transceiver (s) 210 that may include radio frequency (RF) transmitter and/or receiver circuitry that use the antenna (s) 212 of the wireless device 202 to facilitate signaling (e.g., the signaling 234) to and/or from the wireless device 202 with other devices (e.g., the network device 218) according to corresponding RATs.
  • RF radio frequency
  • the wireless device 202 may include one or more antenna (s) 212 (e.g., one, two, four, or more) .
  • the wireless device 202 may leverage the spatial diversity of such multiple antenna (s) 212 to send and/or receive multiple different data streams on the same time and frequency resources.
  • This behavior may be referred to as, for example, multiple input multiple output (MIMO) behavior (referring to the multiple antennas used at each of a transmitting device and a receiving device that enable this aspect) .
  • MIMO multiple input multiple output
  • MIMO transmissions by the wireless device 202 may be accomplished according to precoding (or digital beamforming) that is applied at the wireless device 202 that multiplexes the data streams across the antenna (s) 212 according to known or assumed channel characteristics such that each data stream is received with an appropriate signal strength relative to other streams and at a desired location in the spatial domain (e.g., the location of a receiver associated with that data stream) .
  • Certain embodiments may use single user MIMO (SU-MIMO) methods (where the data streams are all directed to a single receiver) and/or multi user MIMO (MU-MIMO) methods (where individual data streams may be directed to individual (different) receivers in different locations in the spatial domain) .
  • SU-MIMO single user MIMO
  • MU-MIMO multi user MIMO
  • the wireless device 202 may implement analog beamforming techniques, whereby phases of the signals sent by the antenna (s) 212 are relatively adjusted such that the (joint) transmission of the antenna (s) 212 can be directed (this is sometimes referred to as beam steering) .
  • the wireless device 202 may include one or more interface (s) 214.
  • the interface (s) 214 may be used to provide input to or output from the wireless device 202.
  • a wireless device 202 that is a UE may include interface (s) 214 such as microphones, speakers, a touchscreen, buttons, and the like in order to allow for input and/or output to the UE by a user of the UE.
  • Other interfaces of such a UE may be made up of made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 210/antenna (s) 212 already described) that allow for communication between the UE and other devices and may operate according to known protocols (e.g., and the like) .
  • the network device 218 may include one or more processor (s) 220.
  • the processor (s) 220 may execute instructions such that various operations of the network device 218 are performed, as described herein.
  • the processor (s) 204 may include one or more baseband processors implemented using, for example, a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the network device 218 may include a memory 222.
  • the memory 222 may be a non-transitory computer-readable storage medium that stores instructions 224 (which may include, for example, the instructions being executed by the processor (s) 220) .
  • the instructions 224 may also be referred to as program code or a computer program.
  • the memory 222 may also store data used by, and results computed by, the processor (s) 220.
  • the network device 218 may include one or more transceiver (s) 226 that may include RF transmitter and/or receiver circuitry that use the antenna (s) 228 of the network device 218 to facilitate signaling (e.g., the signaling 234) to and/or from the network device 218 with other devices (e.g., the wireless device 202) according to corresponding RATs.
  • transceiver s
  • RF transmitter and/or receiver circuitry that use the antenna (s) 228 of the network device 218 to facilitate signaling (e.g., the signaling 234) to and/or from the network device 218 with other devices (e.g., the wireless device 202) according to corresponding RATs.
  • the network device 218 may include one or more antenna (s) 228 (e.g., one, two, four, or more) .
  • the network device 218 may perform MIMO, digital beamforming, analog beamforming, beam steering, etc., as has been described.
  • the network device 218 may include one or more interface (s) 230.
  • the interface (s) 230 may be used to provide input to or output from the network device 218.
  • a network device 218 that is a base station may include interface (s) 230 made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 226/antenna (s) 228 already described) that enables the base station to communicate with other equipment in a core network, and/or that enables the base station to communicate with external networks, computers, databases, and the like for purposes of operations, administration, and maintenance of the base station or other equipment operably connected thereto.
  • circuitry e.g., other than the transceiver (s) 226/antenna (s) 228 already described
  • New cellular communication techniques are continually under development, to increase coverage, to better serve the range of demands and use cases, and for a variety of other reasons.
  • One technique that is currently under development may include supporting multi-TRP operation, for example, for purpose of higher throughput or reliability.
  • the access node includes an access node controller (ANC) , which may be a central unit (CU) of a distributed RAN, such as the RAN 106.
  • the backhaul interface to a core network, such as the CN 124, may terminate at the ANC.
  • the backhaul interface to neighboring access nodes may terminate at the ANC.
  • the ANC may include one or more TRPs.
  • the TRP (which is completely referred to as Transmit Receive Point) may correspond to an eNB, a gNB, an APs, or some other term. In some cases, “TRP” may be used interchangeably with “cell” .
  • FIG. 3 illustrates an example scenario of the multi-TRP transmission according to some aspects of the present application, in which two TRPs are shown for purpose of explanation, but the number of TRPs is not limited particularly.
  • the UE is scheduled to perform downlink (DL) and/or uplink (UL) transmissions with the TRPs, namely, TRP 1 and TRP 2.
  • DL downlink
  • UL uplink
  • FIG. 4 shows a diagram of a frame structure in 5G NR.
  • the frame in NR also has a length of 10ms and includes 10 subframes of equal size, each of which has a length of 1ms.
  • the frame structure in NR has a flexible structure that depends on supported Sub-Carrier Spacing (SCS) .
  • SCS Sub-Carrier Spacing
  • Each subframe has a configurable number (e.g., 1, 2, 4, 8 or 16) of time slots.
  • Each slot also has a configurable number of OFDM symbols.
  • each slot For a normal cyclic prefix, each slot includes 14 consecutive OFDM symbols, and for an extended cyclic prefix, each slot includes 12 consecutive OFDM symbols.
  • each time slot includes several resource blocks, and each resource block includes 12 consecutive subcarriers in the frequency domain, for example.
  • a resource grid can be used to represent resource elements (RE) in a time slot, as shown in FIG. 4.
  • FIG. 5 illustrates uplink-downlink timing relation.
  • N TA can be adjusted by a Timing Advance Command (TAC) for a Timing Advance Group (TAG) .
  • TAG refers to a group of serving cells that is configured by Radio Resource Control (RRC) and that, for the cells with a UL configured, uses the same timing reference cell and the same TA value.
  • RRC Radio Resource Control
  • the UE may apply a TA to a timing of an uplink transmission to account for a round trip time (RTT) delay.
  • RTT round trip time
  • the UE ensures that the uplink transmission is transmitted at a correct time with regard to allocated resources, TRP reception, and/or the like, thereby maintaining synchronization in a network.
  • a base station e.g., which may correspond to one or more of the TRPs, as described above
  • the base station may receive a physical random access channel (PRACH) transmission from the UE and determine an estimate of the RTT, from which the base station may determine a TA that the UE is to apply on subsequent transmissions.
  • PRACH physical random access channel
  • MAC Medium Access Control
  • uplink transmissions of a UE toward multiple TRPs shall be configured within the same TAG which shares the same TA.
  • this may raise some problems.
  • the UE may have different distances from TRP 1 and TRP 2, which causes a difference in misalignments of the downlink and uplink frames for TRP 1 and TRP 2. If the UE performs uplink transmissions to both of TRP 1 and TRP 2 with the same TA, a reception quality of at least one transmission may be deteriorated.
  • a mechanism that supports more than one TA in the multi-TRP uplink transmissions.
  • TTD transmission timing difference
  • RTD reception timing difference
  • Different UEs may have different capabilities of handling downlink receptions within the limit of RTD, which is also referred to as a maximum RTD (MRTD) , and of handling uplink transmissions within the limit of TTD, which is also referred to a maximum TTD (MTTD) .
  • RTD maximum RTD
  • MTTD maximum TTD
  • the MRTD between multiple TRPs can be assumed within a cyclic prefix (CP) length as baseline and the MTTD can be CP+M1 ⁇ s for FR1, where M1 is to be determined.
  • CP cyclic prefix
  • the MRTD/MTTD value is 33/34.6 ⁇ s.
  • the MRTD between multiple TRPs can be assumed within a CP length as baseline, and the MTTD can be CP+M2 ⁇ s for FR2, where M2 is to be determined.
  • the MRTD/MTTD value is 8/8.5 ⁇ s.
  • multiple TAs can be supported only if an actual TTD is no larger than the MTTD that the UE can supported.
  • the actual TTD is generally influenced by a propagation delay difference between the UE and multiple TRPs. Due to movement or rotation of the UE, the actual TTD would change from time to time. Note that the actual TTD can be observed only on the UE side. If the TTD exceeds the limit that can be supported, the UE may fail in the multi-TRP uplink transmissions with separate TAs.
  • the UE may report its MTTD and/or MRTD information to the base station.
  • the UE may report the MTTD/MRTD-related information as UE capability.
  • the UE may be classified into several types based on the MTTD and/or MRTD it can handle for multi-TRP transmissions.
  • a new UE capability element related to the MTTD may be defined as
  • MTTDtype-mTRP indicates the MTTD that can be handled by the UE, including:
  • a new UE capability element related to the MRTD may be defined as
  • MRTDtype-mTRP ENUMERATED ⁇ type1, type2, type3 ⁇ , where the value of MRTDtype-mTRP indicates the MRTD that can be handled by the UE, including:
  • the new UE capability could be reported on basis of per UE, per frequency range (FR) , per band combination (BC) , or per band.
  • the UE may report a value of the MTTD and/or a value of the MRTD as new UE assistance information (UAI) .
  • UAI new UE assistance information
  • the value of the MTTD and/or the MRTD may or may not be quantified or graded.
  • the base station may define and configure the UE with one or more events for triggering a report by the UE.
  • the following events may be defined:
  • TTD of multiple TRPs becomes no larger than a threshold
  • Event 2 TTD of multiple TRPs becomes larger than a threshold.
  • the threshold in Event 1 or Event 2 may be determined by the based station based on the MTTD information as reported by the UE.
  • the base station may define and configure the UE with one or more events based on RTD.
  • the following events may be defined:
  • Event 1 RTD of multiple TRPs becomes no larger than a threshold
  • Event 2 RTD of multiple TRPs becomes larger than a threshold.
  • the threshold in Event 1’ or Event 2’ may be determined by the based station based on the MRTD information as reported by the UE.
  • Event 1 and Event 1’ can be collectively referred to as a first event, while Event 2 and Event 2’ can be collectively referred to as a second event.
  • the first event is intended to indicate that the actual TTD falls into a scope of competence of the UE, while the second event is intended to indicate that the actual TTD becomes beyond the scope of competence of the UE.
  • the TTD or RTD of these TRPs may be a maximum of TTDs or RTDs of each pair of TRPs.
  • the configuration of the events can be performed via RRC signaling, for example, in response to the MTTD/MRTD-relation information reported by the UE, or when a TRP fails in reception of uplink transmission from the UE, or even is not necessary.
  • the base station may configure multiple TRPs in one or more TAGs via RRC signaling, for purpose of TA management. At present, it is cells that are included in a TAG. However, there are cases where several TRPs correspond to a cell and have the same physical cell identity (PCI) .
  • PCI physical cell identity
  • an association between a TAG and a set of transmission configuration indicator (TCI) states for use with one or more TRPs The TCI state is generally used to indicate a quasi co-location (QCL) relationship between two reference signals and thus between two transport channels.
  • the TCI state includes UL TCI state for indicating QCL of UL reference signals, and unified joint TCI state for indicating QCL of DL and UL reference signals.
  • the TCI state indicates a channel between the UE and a corresponding TRP, it may be approximately considered to represent the TRP.
  • an association between a TAG and a set of control resource set (CORESET) index values or a set of CORESET pool index values By means of such association between a TAG and a CORESET index or CORESET pool index dedicated to a TRP, the TRP is associated with the TAG, and thus with a TA for the TAG.
  • CORESET control resource set
  • the base station may configure the UE with TAGs under a specific strategy. Examples of TAG management according to some aspects of the present application will be described below with reference to the exemplary scenario of FIG. 3, merely for ease of explanation.
  • the UE may be pre-configured with two or more TAGs for multiple TRPs.
  • the base station may send to the UE a RRC configuration that configures two TAGs for TRP 1 and TRP 2, that is, TRP 1 is configured in TAG 1 and TRP 2 is configured in TAG 2 as illustrated in FIG. 7A, for example, by any of the associations as described above.
  • the number of TAGs and the number of TRPs in each TAG are not limited thereto.
  • the base station may additionally provide a candidate configuration of single TAG to UE.
  • the candidate configuration configures one TAG (i.e., TAG 3) for TRP 1 and TRP 2, for example, by associating TAG 3 with both of TRP1 and TRP 2.
  • TAG 3 may be one of TAG 1 and TAG 2, or even a different TAG from TAG 1 and TAG 2.
  • the candidate configuration is applied only under a certain condition resolved by the UE or triggered by the base station, for example, in the second event to be described below.
  • the UE monitors an actual TTD between TRP 1 and TRP 2.
  • the UE may monitor an actual RTD between TRP 1 and TRP 2 due to some reason, such as because the TTD is not available.
  • the UE may decide whether the event or events occur. For example, the UE may determine the first event (Event 1 or Event 1’) when the monitored TTD is not beyond a TTD threshold as configured in the event, or when the monitored RTD is not beyond a RTD threshold as configured in the event, and may determine the second event (Event 2 or Event 2’) when the monitored TTD is beyond a TTD threshold as configured in the event, or when the monitored RTD is beyond a configured RTD threshold as configured in the event.
  • Event 1 or Event 1 the first event
  • Event 2 Event 2
  • a threshold such as (MTTD–D1)
  • D1 may be pre-defined in a specification (e.g., a release of 3GPP) , taking a value of 0, or 1/4CP, or 1/3CP, or 1/2CP, or the like
  • a threshold such as (MRTD–D2)
  • the first event occurs, possibly because a difference between the distance from the UE to TRP 1 and the distance from the UE to TRP 2 is small, as illustrated in FIG. 8A.
  • the TTD is within the UE’s capability to support two TAs for TRP 1 and TRP 2, and the UE may enable the configuration of two TAGs as shown in FIG. 7A.
  • the UE may inform the base station of the first event by sending a report, for example, using a RRC message, a MAC CE (to one of the serving TRPs) or Layer 1 (L1) reporting based on PUCCH or PUSCH.
  • the base station calculates and provides separate TACs for the two TAGs (TAG 1, TAG 2) , and on the UE side, the UE applies separate TAs to uplink transmissions to TRP 1 and TRP 2.
  • the enablement of the two-TAGs configuration may be done without a report, that is, the UE does not send a report for the first event, and the base station provides separate TACs for the two TAGs unless an opposite report is received.
  • the second event may occur, possibly because a difference between the distance from the UE to TRP 1 and the distance from the UE to TRP 2 is large, as illustrated in FIG. 8B.
  • the TTD is out of the UE’s capability to support two TAs for TRP 1 and TRP 2.
  • the UE may enable this candidate configuration.
  • the UE may inform the base station of the second event.
  • the base station may adapt to the candidate configuration, for example, stop providing separate TACs for the two TAGs (TAG 1, TAG 2) , and start providing a TAC for the candidate TAG 3.
  • the UE applies the same TA to uplink transmissions to TRP 1 and TRP 2. Thereby, the UE falls back to single TA operation.
  • the UE may enable one of TAG 1 and TAG 2 by suspending the other.
  • the UE may perform uplink transmission to only the enabled TAG, for example, TAG 1 (and thus TRP 1) .
  • the UE may enable a specific TAG indicated by the base station, e.g., the base station can indicate a primary TAG (pTAG) which contains a special cell (SpCell) of a MAC entity and a secondary TAG (sTAG) which refers to other TAGs, and based on the indication, the UE may enable the pTAG while suspending the sTAG.
  • pTAG primary TAG
  • SpCell special cell
  • sTAG secondary TAG
  • the UE may enable the pTAG according to requirements in a technical specification.
  • the UE may enable any one of the TAGs.
  • the UE may send a report for the second event to the base station, and the base station provides only a TAC for the enabled TAG.
  • the UE may not send a report for the second event, and as a result, receives two TACs for TAG 1 and TAG 2, but applies only the TAC for TAG 1.
  • the UE sends a report for the second event to the base station.
  • the base station may provide a reconfiguration that configures the TRPs in a single TAG.
  • the UE may enable the single TAG for TRP 1 and TRP 2, and receive subsequent TAC for the TAG.
  • the base station may switch the TCI states used by the UE by configuring and indicating a new set of TCI states for the TRPs.
  • the new set of TCI states can be selected to ensure the TTD is within the UE’s capability.
  • the base station configures the UE with an association of the new TCI states with two TAGs for TRP 1 and TRP 2, either the original TAGs or new TAGs. Due to the switch of the TCI states, spatial beams used by the UE for uplink transmissions are changed, resulting in a change of signal propagation paths and a reduction of the TTD.
  • the UE may be pre-configured with one TAG for multiple TRPs.
  • the base station may send to the UE a RRC configuration that configures one TAG for either or both of TRP 1 and TRP 2, for example, by any of the associations as described above.
  • the UE monitors an actual TTD between TRP 1 and TRP 2.
  • the UE may monitor an actual RTD between TRP 1 and TRP 2.
  • the UE may decide whether the event or events occur. For example, the UE may determine the first event (Event 1 or Event 1’) when the monitored TTD is not beyond a TTD threshold as configured in the event, or when the monitored RTD is not beyond a RTD threshold as configured in the event, and may determine the second event (Event 2 or Event 2’) when the monitored TTD is beyond a TTD threshold as configured in the event, or when the monitored RTD is beyond a configured RTD threshold as configured in the event.
  • Event 1 or Event 1 the first event
  • Event 2 Event 2
  • the UE may perform a similar determination. For example, the UE may compare the actual TTD with a threshold, such as (MTTD–D1) , where D1 may be pre-defined in a specification or may be configurable by the base station. The UE may alternatively compare the actual RTD with a threshold, such as (MRTD–D2) , where D2 may be pre-defined in a specification or may be configurable by the base station. If the actual TTD/RTD is not beyond the respective threshold, the UE may determine there is the first event, otherwise, the UE may determine there is the second event.
  • a threshold such as (MTTD–D1)
  • D1 may be pre-defined in a specification or may be configurable by the base station.
  • the UE may alternatively compare the actual RTD with a threshold, such as (MRTD–D2) , where D2 may be pre-defined in a specification or may be configurable by the base station. If the actual TTD/RTD is not beyond the respective threshold, the UE may determine there is
  • the UE receives a TAC for the single TAG as configured, and based on the received TAC, applies the same TA for uplink translations to TRP 1 and TRP 2.
  • the UE may send a report for the second event to the base station, for example, via RRC, MAC or L1 reporting, so that the base station continues providing a single TAC for the TAG.
  • the UE sends a report for the first event to the base station.
  • the base station can trigger the UE to transmit a random access channel (RACH) such as PRACH to the TRP with which the UE is not performing uplink transmission.
  • RACH random access channel
  • the base station may estimate a TA for TRP 2 based on a preamble carried in the PRACH, and reconfigure TRP 2 in a different TAG from TRP 1. Based on the reconfiguration, the UE may enable separate TAGs for TRP 1 and TRP 2, and thus apply separate TAs for uplink transmissions to these two TRPs.
  • the base station may indicate the UE to transmit a PRACH to a new TRP different from TRP 1 and TRP 2, and reconfigures TRP 1, TRP 2 and the new TRP in two or more TAGs. Details are not described here.
  • the base station may estimate TA values based on the received uplink signals from them, and reconfigures TRP 1 and TRP 2 in two TAGs. The reconfiguration results in the UE supporting separate TAGs (and thus TAs) for the TRPs.
  • TRP 1 in TAG 1 and TRP 2 in TAG 2 are described with reference to FIG. 3 with TRP 1 in TAG 1 and TRP 2 in TAG 2, however, it should be noted that the number of TAGs is not limited to two, and the number of TRPs in each TAG is not limited to one.
  • the embodiments of the present application may support management for more than two TAGs under the similar principle.
  • FIG. 9 is a flowchart diagram illustrating an example method for supporting the multi-TRP operation according to some aspects of the present application. The method may be carried out at a UE.
  • the UE monitors a TTD between multiple TRPs, or monitors a RTD between the multiple TRPs in the TTD is not available.
  • the TTD or RTD may be a maximum of TTDs or RTDs of any two TRPs.
  • the UE determines a first event that the TTD or RTD is not beyond a respective threshold, or a second event that the TTD or RTD is beyond a respective threshold.
  • the event or the threshold may be predefined or configurable by the base station.
  • the UE enables two or more TAGs for the multiple TRPs in the first event. If the UE is pre-configured with one TAG, then in the first event, the UE may send a report for the first event to the base station which may reconfigures two or more TAGs for the multiple TRPs. If the UE is pre-configured with multiple TAGs, then in the second event, the UE may enable a single TAG, or switch to a new set of TCI states such that the first event occurs.
  • FIG. 10 is a flowchart diagram illustrating an example method for supporting the multi-TRP operation according to some aspects of the present application. The method may be carried out at a base station.
  • the base station receives from a UE a report for a first event that a TTD or RTD between multiple TRPs is not beyond a respective threshold related to the UE’s capability, or a report for a second event that the TTD or RTD is beyond the respective threshold.
  • the event or the threshold may be predefined or configurable by the base station.
  • the base station may know that multiple TAGs for the multiple TRPs can be supported by the UE, and send separate TACs for the multiple TAGs to the UE.
  • the base station may know that only one TAG for the multiple TRPs can be supported by the UE, and send a TAC for the TAG to the UE, or may configure and indicate a new set of TCI states to the UE, such that the first event occurs.
  • Embodiments contemplated herein include an apparatus comprising means to perform one or more elements of the method as shown in FIG. 9.
  • This apparatus may be, for example, an apparatus of a UE (such as a wireless device 202 that is a UE, as described herein) .
  • Embodiments contemplated herein include one or more non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of the method as shown in FIG. 9.
  • This non-transitory computer-readable media may be, for example, a memory of a UE (such as a memory 206 of a wireless device 202 that is a UE, as described herein) .
  • Embodiments contemplated herein include an apparatus comprising logic, modules, or circuitry to perform one or more elements of the method as shown in FIG. 9.
  • This apparatus may be, for example, an apparatus of a UE (such as a wireless device 202 that is a UE, as described herein) .
  • Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of the method as shown in FIG. 9.
  • This apparatus may be, for example, an apparatus of a UE (such as a wireless device 202 that is a UE, as described herein) .
  • Embodiments contemplated herein include a signal as described in or related to one or more elements of the method as shown in FIG. 9.
  • Embodiments contemplated herein include a computer program or computer program product comprising instructions, wherein execution of the program by a processor is to cause the processor to carry out one or more elements of the method as shown in FIG. 9.
  • the processor may be a processor of a UE (such as a processor (s) 204 of a wireless device 202 that is a UE, as described herein) .
  • These instructions may be, for example, located in the processor and/or on a memory of the UE (such as a memory 206 of a wireless device 202 that is a UE, as described herein) .
  • Embodiments contemplated herein include an apparatus comprising means to perform one or more elements of the method as shown in FIG. 10.
  • This apparatus may be, for example, an apparatus of a base station (such as a network device 218 that is a base station, as described herein) .
  • Embodiments contemplated herein include one or more non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of the method as shown in FIG. 10.
  • This non-transitory computer-readable media may be, for example, a memory of a base station (such as a memory 222 of a network device 218 that is a base station, as described herein) .
  • Embodiments contemplated herein include an apparatus comprising logic, modules, or circuitry to perform one or more elements of the method as shown in FIG. 10.
  • This apparatus may be, for example, an apparatus of a base station (such as a network device 218 that is a base station, as described herein) .
  • Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of the method as shown in FIG. 10.
  • This apparatus may be, for example, an apparatus of a base station (such as a network device 218 that is a base station, as described herein) .
  • Embodiments contemplated herein include a signal as described in or related to one or more elements of the method as shown in FIG. 10.
  • Embodiments contemplated herein include a computer program or computer program product comprising instructions, wherein execution of the program by a processing element is to cause the processing element to carry out one or more elements of the method as shown in FIG. 10.
  • the processor may be a processor of a base station (such as a processor (s) 220 of a network device 218 that is a base station, as described herein) .
  • These instructions may be, for example, located in the processor and/or on a memory of the UE (such as a memory 222 of a network device 218 that is a base station, as described herein) .
  • At least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, and/or methods as set forth herein.
  • a baseband processor as described herein in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein.
  • circuitry associated with a UE, base station, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein.
  • Example 1 may include an apparatus of a user equipment (UE) , the apparatus comprising: a processor; and a memory storing instructions that, when executed by the processor, configure the apparatus to: monitor a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) ; determine a first event that the TTD or the RTD is not beyond a respective threshold related to the UE’s capability, or a second event that the TTD or the RTD is beyond the respective threshold; and enable two or more Timing Advance Groups (TAGs) for the multiple TRPs in the first event, or a single TAG for the multiple TRPs in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • TRPs Transmit Receive Points
  • Example 2 may include the apparatus of Example 1, wherein the UE is pre-configured with a RRC configuration that configures the multiple TRPs in the two or more TAGs by a base station.
  • Example 3 may include the apparatus of Example 2, wherein the instructions that, when executed by the processor, further configure the apparatus to: in the first event, receive, from the base station, two or more Timing Advance (TA) values corresponding to the two or more TAGs, respectively.
  • TA Timing Advance
  • Example 4 may include the apparatus of Example 3, wherein the instructions that, when executed by the processor, further configure the apparatus to: in the first event, send a report for the first event to the base station, wherein the two or more TA values are sent by the base station in response to the report.
  • Example 5 may include the apparatus of Example 2, wherein the UE is pre-configured with a candidate RRC configuration that configures the multiple TRPs in a single TAG by the base station, and wherein the instructions that, when executed by the processor, further configure the apparatus to: in the second event, send a report for the second event to the base station; and receive, from a base station, one Timing Advance (TA) value corresponding to the single TAG.
  • TA Timing Advance
  • Example 6 may include the apparatus of Example 2, wherein the instructions that, when executed by the processor, further configure the apparatus to: in the second event, send a report for the second event to the base station; receive, from a base station, a RRC reconfiguration that configures the multiple TRPs in a single TAG; and receive, from a base station, one Timing Advance (TA) value corresponding to the single TAG.
  • TA Timing Advance
  • Example 7 may include the apparatus of Example 2, the instructions that, when executed by the processor, further configure the apparatus to: in the second event, enable one of the two or more TAGs by suspending remaining TAGs.
  • Example 8 may include the apparatus of Example 1, wherein the TAG is configured to be associated with at least one of a set of Transmission Configuration Indicator (TCI) states for the TRPs, a set of Control Resource Set (CORESET) index values for the TRPs, or a set of CORESET pool index values for the TRPs.
  • TCI Transmission Configuration Indicator
  • CORESET Control Resource Set
  • Example 9 may include the apparatus of Example 8, wherein the instructions that, when executed by the processor, further configure the apparatus to: in the second event, send a report for the second event to the base station; receive from the base station a RRC reconfiguration that associate the two or more TAGs with a different set of TCI states for the multiple TRPs; and use the different set of TCI states for uplink transmissions to the multiple TRPs, so that the TTD or the RTD between the multiple TRPs is not beyond the threshold.
  • Example 10 may include the apparatus of Example 1, wherein the UE is pre-configured with a RRC configuration that configures the multiple TRPs in one TAG by a base station, and wherein the instructions that, when executed by the processor, further configure the apparatus to: in the first event, send a report for the first event to the base station; receive, from the base station, a RRC reconfiguration that configures the multiple TRPs in two or more TAGs; and receive, from a base station, two or more Timing Advance (TA) values corresponding to the two or more TAGs, respectively.
  • TA Timing Advance
  • Example 11 may include the apparatus of Example 10, wherein the instructions that, when executed by the processor, further configure the apparatus to: for at least one TRP of the multiple TRPs with which the UE has not performed uplink transmission, transmit an uplink signal or Random Access Channel (RACH) to the at least one TRP for calculation of Timing Advance (TA) value;
  • RACH Random Access Channel
  • Example 12 may include the apparatus of Example 1, wherein the respective threshold for the TTD or RTD is predefined in a specification or configurable by a base station.
  • Example 13 may include the apparatus of Example 1, wherein the instructions that, when executed by the processor, further configure the apparatus to: send, to a base station, information on maximum TTD (MTTD) or maximum RTD (MRTD) that can be supported by the UE, the information including a type of the UE classified based on the MTTD or MRTD, or a value of the MTTD or MRTD; and receive, from the base station, a RRC configuration regarding the first event and the second event which are based on the information on the MTTD or MRTD.
  • MTTD maximum TTD
  • MRTD maximum RTD
  • Example 14 may include an apparatus of a base station, the apparatus comprising: a processor; and a memory storing instructions that, when executed by the processor, configure the apparatus to: receive, from a UE, a report for a first event that a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) is not beyond a respective threshold related to the UE’s capability, or for a second event that the TTD or the RTD is beyond the respective threshold; and send, to the UE, two or more Timing Advance (TA) values for two or more Timing Advance Group (TAGs) enabled for the multiple TRPs in the first event, or one TA value for a single TAG enabled in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • Example 15 may include the apparatus of Example 14, wherein the instructions that, when executed by the processor, configure the apparatus to: pre-configure the UE with a RRC configuration that configures the multiple TRPs in the two or more TAGs.
  • Example 16 may include the apparatus of Example 15, wherein the instructions that, when executed by the processor, configure the apparatus to: pre-configure the UE with a candidate RRC configuration that configures the multiple TRPs in a single TAG, and in response to the report for the second event, send, to the UE, one TA value corresponding to the single TAG.
  • Example 17 may include the apparatus of Example 15, wherein the instructions that, when executed by the processor, further configure the apparatus to: in response to the report for the second event, send, to the UE, a RRC reconfiguration that configures the multiple TRPs in a single TAG; and send, to the UE, one Timing Advance (TA) value corresponding to the single TAG.
  • TA Timing Advance
  • Example 18 may include the apparatus of Example 15, wherein the TAG is configured to be associated with at least one of a set of Transmission Configuration Indicator (TCI) states for the TRPs, a set of Control Resource Set (CORESET) index values for the TRPs, or a set of CORESET pool index values for the TRPs.
  • TCI Transmission Configuration Indicator
  • CORESET Control Resource Set
  • Example 19 may include the apparatus of Example 18, wherein the instructions that, when executed by the processor, further configure the apparatus to: in response to the report for the second event, send, to the UE, a RRC reconfiguration that associate the two or more TAGs with a different set of TCI states for the multiple TRPs, which causes the TTD or the RTD between the multiple TRPs to be not beyond the threshold.
  • Example 20 may include the apparatus of Example 14, wherein the instructions that, when executed by the processor, further configure the apparatus to: pre-configure the UE with a RRC configuration that configures the multiple TRPs in one TAG by a base station; in response to the report for the first event, send, to the UE, a RRC reconfiguration that configures the multiple TRPs in two or more TAGs; and send, to the UE, two or more Timing Advance (TA) values corresponding to the two or more TAGs, respectively.
  • TA Timing Advance
  • Example 21 may include the apparatus of Example 20, wherein the instructions that, when executed by the processor, further configure the apparatus to: indicate the UE to transmit an uplink signal or Random Access Channel (RACH) to at least one TRP of the multiple TRPs with which the UE has not performed uplink transmission, for calculation of Timing Advance (TA) value.
  • RACH Random Access Channel
  • Example 22 may include the apparatus of Example 14, wherein the instructions that, when executed by the processor, further configure the apparatus to: receive, from the UE, information on maximum TTD (MTTD) or maximum RTD (MRTD) that can be supported by the UE, the information including a type of the UE classified based on the MTTD or MRTD, or a value of the MTTD or MRTD, configure the UE with the first event and the second event based on the information on the MTTD or MRTD.
  • MTTD maximum TTD
  • MRTD maximum RTD
  • Example 23 may include a method, comprising: monitoring a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) ; determining a first event that the TTD or the RTD is not beyond a respective threshold related to the UE’s capability, or a second event that the TTD or the RTD is beyond the respective threshold; and enabling two or more Timing Advance Groups (TAGs) for the multiple TRPs in the first event, or a single TAG for the multiple TRPs in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • TRPs Transmit Receive Points
  • Example 24 may include a method, comprising: receiving, from a UE, a report for a first event that a transmission timing difference (TTD) or a reception timing difference (RTD) between multiple Transmit Receive Points (TRPs) is not beyond a respective threshold related to the UE’s capability, or for a second event that the TTD or the RTD is beyond the respective threshold; and sending, to the UE, two or more Timing Advance (TA) values for two or more Timing Advance Group (TAGs) enabled for the multiple TRPs in the first event, or one TA value for a single TAG enabled in the second event.
  • TTD transmission timing difference
  • RTD reception timing difference
  • Embodiments and implementations of the systems and methods described herein may include various operations, which may be embodied in machine-executable instructions to be executed by a computer system.
  • a computer system may include one or more general-purpose or special-purpose computers (or other electronic devices) .
  • the computer system may include hardware components that include specific logic for performing the operations or may include a combination of hardware, software, and/or firmware.
  • 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

L'invention concerne un appareil d'un équipement utilisateur (UE), l'appareil comprenant un processeur, et une mémoire stockant des instructions qui, lorsqu'elles sont exécutées par le processeur, configurent l'appareil pour : surveiller une différence de synchronisation de transmission (TTD) ou une différence de synchronisation de réception (RTD) entre de multiples points de transmission-réception (TRP) ; déterminer un premier événement pour lequel la TTD ou la RTD ne dépasse pas un seuil respectif associé à la capacité de l'UE, ou un second événement pour lequel la TTD ou la RTD dépasse le seuil respectif ; et activer au moins deux groupes d'avance temporelle (TAG) pour les multiples TRP dans le premier événement, ou un TAG unique pour les multiples TRP dans le second événement.
PCT/CN2023/076445 2023-02-16 2023-02-16 Gestion de synchronisation de transmission en liaison montante dans un fonctionnement à plusieurs trp WO2024168685A1 (fr)

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WO2021226610A2 (fr) * 2020-08-06 2021-11-11 Futurewei Technologies, Inc. Système et procédé pour liaison montante et liaison descendante dans des communications multipoints
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WO2021226610A2 (fr) * 2020-08-06 2021-11-11 Futurewei Technologies, Inc. Système et procédé pour liaison montante et liaison descendante dans des communications multipoints
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