WO2024087587A1 - Procédés et appareils de calcul et de rapport de csi pour une transmission conjointe cohérente - Google Patents

Procédés et appareils de calcul et de rapport de csi pour une transmission conjointe cohérente Download PDF

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Publication number
WO2024087587A1
WO2024087587A1 PCT/CN2023/094130 CN2023094130W WO2024087587A1 WO 2024087587 A1 WO2024087587 A1 WO 2024087587A1 CN 2023094130 W CN2023094130 W CN 2023094130W WO 2024087587 A1 WO2024087587 A1 WO 2024087587A1
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WIPO (PCT)
Prior art keywords
csi
resource
additional time
time duration
symbol
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PCT/CN2023/094130
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English (en)
Inventor
Yi Zhang
Chenxi Zhu
Wei Ling
Bingchao LIU
Lingling Xiao
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Lenovo (Beijing) Limited
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Priority to PCT/CN2023/094130 priority Critical patent/WO2024087587A1/fr
Publication of WO2024087587A1 publication Critical patent/WO2024087587A1/fr

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Classifications

    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present disclosure relates to wireless communications, and particularly relates to methods and apparatuses for channel state information (CSI) computation and reporting for coherent joint transmission (CJT) .
  • CSI channel state information
  • CJT coherent joint transmission
  • MIMO multiple inputs multiple outputs
  • 3GPP 3 rd generation partnership project
  • CSI channel state information
  • FDD frequency division duplex
  • TDD time division duplex
  • TRP transmission or reception points
  • CJT may be implicitly indicated by the configuration information indicating a number of channel state information-reference signal (CSI-RS) resources in a CSI-RS resource set as channel measurement resources in the present disclosure.
  • CSI-RS channel state information-reference signal
  • the expression “receiving the configuration information indicating a number of CSI-RS resources in a CSI-RS resource set as channel measurement resources” (or similar expressions) and the expression “CJT” may be interchangeably used in the description.
  • An embodiment of the present disclosure provides a user equipment (UE) , comprising: a transceiver; and a processor coupled with the transceiver and configured to: receive, via the transceiver, configuration information indicating a number of channel state information-reference signal (CSI-RS) resource in a CSI-RS resource set as channel measurement resources; determine a first symbol associated with a first additional time duration and a second symbol associated with a second additional time duration; and transmit, via the transceiver, a CSI report in the case that an uplink transmission carrying the CSI report is later than or at the same time with the first symbol after an end of a last symbol of a physical downlink control channel (PDCCH) which triggers the CSI report; and in the case that uplink transmission carrying the CSI report is later than or at the same time with the second symbol after an end of a last symbol of an aperiodic CSI-RS resource for channel measurements, an aperiodic channel measurement-interference measurement (CSI-IM) used for an interference measurement, and
  • the first symbol is determined by a third symbol defined by the specification and the first additional time duration
  • the second symbol is determined by a fourth symbol defined by the specification and the second additional time duration.
  • the first additional time duration or the second additional time duration includes a first time period.
  • a value of the threshold is 8 in the case that 3 transmission or reception points (TRPs) or 4 TRPs are configured; or a value of the threshold is 16 in the case that 2 TRPs are configured.
  • the first additional time duration or the second additional time duration includes a second time period.
  • the first additional time duration or the second additional time duration includes a third time period.
  • the processor is further configured to: transmit, via the transceiver, UE capability information indicating one or more additional time durations, wherein the one or more additional time durations includes a first time period, a second time period or a third time period .
  • the first additional time duration or the second additional time duration is determined from one or more additional time durations reported by the UE, predetermined by a specification, or configured by a base station (BS) based on the one or more additional time durations reported by the UE.
  • BS base station
  • the first additional time duration or the second additional time duration is associated with a minimum subcarrier spacing (SCS) of the following: an SCS of a PDCCH carrying downlink control information (DCI) which triggers the SCI report; an SCS of the uplink transmission carrying the CSI report; or a minimum SCS of an aperiodic CSI-RS triggered by the DCI.
  • SCS subcarrier spacing
  • the first additional time duration or the second additional time duration includes a number of orthogonal frequency division multiplexing (OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • the first additional time duration and the second additional time duration have the same value.
  • the first additional time duration and the second additional time duration are scalable based on different SCSs.
  • a UE comprising: a transceiver; and a processor coupled with the transceiver and configured to: receive, via the transceiver, configuration information indicating a number of CSI-RS resources in a CSI-RS resource set and configuration information of discontinuous reception (DRX) ; and transmit, via the transceiver, a CSI report based on time relation between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX active time duration.
  • DRX discontinuous reception
  • the CSI report is only transmitted in the case that a CSI-RS transmission occasion for each CSI-RS resource in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain.
  • the CSI report is transmitted in the case that a first CSI-RS transmission occasion for a first CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain, and wherein a second CSI-RS transmission occasion for a second CSI-RS resource (s) in the CSI-RS resource set is later than the CSI reference resource in the time domain; or in the case that a first CSI-RS transmission occasion for a first CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain, and a second CSI-RS transmission occasion for a second CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain.
  • the CSI report is based on the first CSI-RS resource in the CSI-RS resource set.
  • the CSI report is based on the first CSI-RS resource in the CSI-RS resource set, or both the first CSI-RS resource and the second CSI-RS resource in the CSI-RS resource set.
  • a BS comprising: a transceiver; and a processor coupled with the transceiver and configured to: transmit, via the transceiver, configuration information indicating a number of CSI-RS resources in a CSI-RS resource set as channel measurement resources; determine a first symbol associated with a first additional time duration and a second symbol associated with a second additional time duration; and receive, via the transceiver, a CSI report in the case that an uplink transmission carrying the CSI report is later than or at the same time with the first symbol after an end of a last symbol of a PDCCH which triggers the CSI report; and in the case that uplink transmission carrying the CSI report is later than or at the same time with the second symbol after an end of a last symbol of an aperiodic CSI-RS resource for channel measurements, an aperiodic CSI-IM used for an interference measurement, and an aperiodic NZP CSI-RS for an interference measurement.
  • the first symbol is determined by a third symbol defined by the specification and the first additional time duration
  • the second symbol is determined by a fourth symbol defined by the specification and the second additional time duration.
  • the first additional time duration or the second additional time duration includes a first time period.
  • a value of the threshold is 8 in the case that 3 TRPs or 4 TRPs are configured; or a value of the threshold is 16 in the case that 2 TRPs are configured.
  • the first additional time duration or the second additional time duration includes a second time period.
  • the first additional time duration or the second additional time duration includes a third time period.
  • the processor is further configured to: transmit, via the transceiver, UE capability information indicating one or more additional time durations, wherein the one or more additional time durations includes a first time period, a second time period or a third time period.
  • the first additional time duration or the second additional time duration is determined from one or more additional time durations reported by the UE, predetermined by a specification, or configured by the BS based on the one or more additional time durations reported by the UE.
  • the first additional time duration or the second additional time duration is associated with a minimum SCS of the following: an SCS of a PDCCH carrying DCI which triggers the SCI report; an SCS of the uplink transmission carrying the CSI report; or a minimum SCS of an aperiodic CSI-RS triggered by the DCI.
  • the first additional time duration or the second additional time duration includes a number of orthogonal frequency division multiplexing (OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • the first additional time duration and the second additional time duration have the same value.
  • the first additional time duration and the second additional time duration are scalable based on different SCSs.
  • Still another embodiment of the present disclosure provides a BS, comprising: a transceiver; and a processor coupled with the transceiver and configured to: transmit, via the transceiver, configuration information indicating a number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and receive, via the transceiver, a CSI report based on time relation between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX active time duration.
  • the CSI report is only received in the case that a CSI-RS transmission occasion for each CSI-RS resource in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain.
  • the CSI report is received in the case that a first CSI-RS transmission occasion for a first CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain, and wherein a second CSI-RS transmission occasion for a second CSI-RS resource (s) in the CSI-RS resource set is later than the CSI reference resource in the time domain; or in the case that a first CSI-RS transmission occasion for a first CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain, and a second CSI-RS transmission occasion for a second CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain.
  • the CSI report is based on the first CSI-RS resource in the CSI-RS resource set.
  • the CSI report is based on the first CSI-RS resource in the CSI-RS resource set, or both the first CSI-RS resource and the second CSI-RS resource in the CSI-RS resource set.
  • Still another embodiment of the present disclosure provides a method performed by a UE, comprising: receiving configuration information indicating a number of CSI-RS resource in a CSI-RS resource set as channel measurement resources; determining a first symbol associated with a first additional time duration and a second symbol associated with a second additional time duration; and transmitting a CSI report in the case that an uplink transmission carrying the CSI report is later than or at the same time with the first symbol after an end of a last symbol of a PDCCH which triggers the CSI report; and in the case that uplink transmission carrying the CSI report is later than or at the same time with the second symbol after an end of a last symbol of an aperiodic CSI-RS resource for channel measurements, an aperiodic CSI-IM used for an interference measurement, and an aperiodic NZP CSI-RS for an interference measurement.
  • Still another embodiment of the present disclosure provides a method performed by a BS, comprising: transmitting configuration information indicating a number of CSI-RS resources in a CSI-RS resource set as channel measurement resources; determining a first symbol associated with a first additional time duration and a second symbol associated with a second additional time duration; and receiving a CSI report in the case that an uplink transmission carrying the CSI report is later than or at the same time with the first symbol after an end of a last symbol of a PDCCH which triggers the CSI report; and in the case that uplink transmission carrying the CSI report is later than or at the same time with the second symbol after an end of a last symbol of an aperiodic CSI-RS resource for channel measurements, an aperiodic CSI-IM used for an interference measurement, and an aperiodic NZP CSI-RS for an interference measurement.
  • Still another embodiment of the present disclosure provides a method performed by a UE, comprising receiving configuration information indicating a number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and transmitting a CSI report based on time relation between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX active time duration.
  • Still another embodiment of the present disclosure provides a method performed by a BS, comprising transmitting configuration information indicating a number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and receiving a CSI report based on time relation between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX active time duration.
  • Fig. 1 depicts a schematic diagram illustrating a wireless communication system 100 according to some embodiments of the present application.
  • Fig. 2 illustrates time durations for CSI computation according to some embodiments of the present disclosure.
  • Fig. 3 illustrates a method performed by a UE for CJT according to some embodiments of the present disclosure.
  • Fig. 4 illustrates a method performed by a BS for CJT according to some embodiments of the present disclosure.
  • Fig. 5 illustrates a method performed by a UE for CJT according to some embodiments of the present disclosure.
  • Fig. 6 illustrates a method performed by a BS for CJT according to some embodiments of the present disclosure.
  • Fig. 7 illustrates a simplified block diagram of an apparatus according to some embodiments of the present disclosure.
  • Fig. 1 depicts a schematic diagram illustrating an exemplary wireless communication system 100 according to some embodiments of the present application.
  • the wireless communication system 100 may include a BS 101, TRPs 103 (e.g., TRP 103a and TRP 103b) , and UEs 105 (e.g., UE 105a, UE 105b, and UE 105c) .
  • TRPs 103 e.g., TRP 103a and TRP 103b
  • UEs 105 e.g., UE 105a, UE 105b, and UE 105c
  • the wireless communication system 100 may include more or less communication device (s) , apparatus, or node (s) in accordance with some other embodiments of the present application.
  • the wireless communication system 100 may be compatible with any type of network that may be capable of sending and receiving wireless communication signals.
  • the wireless communication system 100 may be compatible with a wireless communication network, a cellular telephone network, a time division multiple access (TDMA) based network, a code division multiple access (CDMA) based network, an orthogonal frequency division multiple access (OFDMA) based network, an LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communications network, a high-altitude platform network, and/or other communications networks.
  • TDMA time division multiple access
  • CDMA code division multiple access
  • OFDMA orthogonal frequency division multiple access
  • the BS 101 may also be referred to as an access point, an access terminal, a base, a macro cell, a node-B, an enhanced or evolved node B (eNB) , a generalized node B (gNB) , a home node-B, a relay node, or a device, or described using other terminology used in the art.
  • the BS 101 is generally part of a radio access network that may include a controller communicably coupled to the BS 101.
  • the TRPs 103 can communicate with the BS 101 via, for example, a backhaul link.
  • Each of TRPs 103 can serve some or all of the UEs 105.
  • the TRP 103a can serve some mobile stations (which include the UE 105a, the UE 105b, and the UE 105c) within a serving area or region (e.g., a cell or a cell sector) .
  • the TRP 103b can serve some mobile stations (which include the UE 105a, the UE 105b, and the UE 105c) within a serving area or region (e.g., a cell or a cell sector) .
  • the TRP 103a and the TRP 103b may serve different UEs.
  • the TRP 103a and the TRP 103b can communicate with each other via, for example, a backhaul link.
  • the TRPs may perform CJT with the UE 105. All the TRPs involved in the CJT may have the same antenna configuration but are at different locations. In the CJT, each TRP may transmit the same data to the UE 105. Each TRP may be configured and transmit with a CSI-RS resource for channel measurement with the same number of antenna ports. In other words, one TRP may correspond to one CSI-RS resource. Therefore, in the present disclosure, the expressions "per TRP" and “per CSI-RS resource” may be used interchangeably, the expressions "across TRPs" and “across CSI-RS resources” may be used interchangeably, or the like.
  • the UE (s) 105 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • the UE (s) 105 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • the UE (s) 105 may include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like.
  • the UE (s) 105 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • 3GPP Release 16 (Rel-16) or Release 17 (Rel-16)
  • N-JT non-coherent joint transmission
  • 3GPP Release 18 (Rel-18)
  • MIMO downlink and uplink multiple input multiple output
  • CJT may improve coverage and cell average throughput and cell edge throughput in commercial deployments with high-performance backhaul and synchronization, and provide enhancement on channel state information (CSI) acquisition for frequency division duplex (FDD) and time division duplex (TDD) , which can be beneficial in expanding the utility of multi-TRP deployments. Accordingly, In Rel-18, CJT may be further studied.
  • CSI channel state information
  • the maximum number of CSI-RS ports per CSI-RS resource may be 32.
  • the TRP number configured for CJT may be 2, 3, and 4, the maximum number of CSI-RS ports across CSI-RS resources may be 128.
  • Each CSI-RS resource may have the same number of CSI-RS ports.
  • RRC radio link control
  • the selection of N CSI-RS resources from N TRP candidate CSI-RS resources may be performed by a UE for CJT. That is, the UE may support TRP selection dynamically and indicate the selected TRP (s) (or TRP selection) in a CSI report.
  • the selection of a beam number combination from N L (N L >1) configured combinations can be performed by a UE for CJT. In other words, the UE may support beam number combination selection and indicate the selected beam number combination in a CSI report.
  • the UE may provide a valid CSI report for a triggered report (e.g. the n-th triggered report) in the case that the following two conditions are fulfilled:
  • the first uplink symbol to carry the n-th CSI report including the effect of the timing advance, starts no earlier than at symbol Z' ref (n) ,
  • Z ref is defined as the next uplink symbol with its CP starting T proc
  • CSI (Z) (2048+144) ⁇ 2 - ⁇ ⁇ T C +T switch after the end of the last symbol of the PDCCH triggering the CSI report (s)
  • Z' ref (n) is defined as the next uplink symbol with its CP starting T' proc
  • CSI (Z') (2048+144) ⁇ 2 - ⁇ ⁇ T C after the end of the last symbol in time of the latest of: aperiodic CSI-RS resource for channel measurements, aperiodic CSI-IM used for interference measurements, and aperiodic NZP CSI-RS for interference measurement, when aperiodic CSI-RS is used for channel measurement for the n-th triggered CSI report.
  • the detailed CP starting of Z ref and Z' ref (n) may be found in 3GPP documents, for example, in TS 38.214, and details are omitted here.
  • the above time durations e.g. Z ref , and Z' ref (n) , do not take the increasing CSI-RS resources for CJT, TRP selection, and beam number combination selection into consideration, thus may no longer be suitable for the UE to provide the CSI report.
  • the present disclosure proposes to introduce one or more additional time durations for some UEs, which may be used by the UE for performing CSI computation.
  • Fig. 2 illustrates time durations for CSI computation according to some embodiments of the present disclosure.
  • the UE may receive a DCI which may trigger one or more CSI reports, and the UE may provide a valid CSI report on PUSCH.
  • the UE may receive a set of CSI-RS resource including Ks CSI-RS resources for channel measurement, where Ks may be the total number of CSI-RS resources in the CSI-RS resource set for channel measurement.
  • Ks may be the total number of CSI-RS resources in the CSI-RS resource set for channel measurement.
  • Ks may be the total number of CSI-RS resources in the CSI-RS resource set for channel measurement.
  • ⁇ Ks 1, at most 32 CSI-RS ports per CSI-RS resource may be configured.
  • the UE may determine the valid time for providing for proving the CSI report, which is associated with two symbols, and the two symbols are denoted with Z 4 and Z 4 ' for simplicity.
  • the CP starting may be the same as defined in in 3GPP documents, for example, in TS 38.214, and details are omitted here.
  • the UE may also receive one or more aperiodic CSI-RS resources for channel measurements, one or more aperiodic CSI-IMs used for interference measurements, and/or one or more aperiodic NZP CSI-RSs for interference measurement.
  • the aperiodic CSI-RS resources, the aperiodic CSI-IMs, and the aperiodic NZP CSI-RSs may not be received at the same time, and one of them may be received last in time.
  • the CP starting may be the same as defined in in 3GPP documents, for example, in TS 38.214, and details are omitted here.
  • the CSI-RS may be received last in time.
  • Z 4 ' may be defined as the next uplink symbol with its CP starting T' proc
  • CSI (Z') (2048+144) ⁇ 2 - ⁇ ⁇ T C after the end of the last symbol in time of the CSI-RS.
  • the UE may prepare the n-th triggered CSI report before the starting of the PUSCH.
  • time durations Z 4 and Z 4 ' may be associated with additional time durations depending on different UE capabilities (or different UE behaviors) , the detailed time durations may be further described in the following four cases.
  • the UE may not support TRP selection or beam number combination selection; or the UE may support TRP selection and beam number combination selection, but may not perform the TRP selection or beam number combination selection.
  • Scenario 1 for 3 TRPs or 4 TRPs, the total number of CSI-RS ports per CSI-RS resource may be less than or equal to 8, ;
  • the total number of CSI-RS ports per CSI-RS resource may be less than or equal to 16, .
  • the legacy CSI computation table may be reused and details are omitted here.
  • parallel CPUs may be used for the 3 TRPs and 4 parallel CPUs may be used for the 4 TRPs.
  • 2 parallel CPUs can be used for 2 TRPs.
  • Scenario 3 for 3 CSI-RS resources in one CSI-RS resource set or 4 CSI-RS resources in one CSI-RS resource set, the total number of CSI-RS ports per CSI-RS resource may be larger than 8;
  • Scenario 4 for 2 CSI-RS resources in one CSI-RS resource set, the total number of CSI-RS ports per CSI-RS resource may be larger than 16.
  • the time for performing the CSI report (i.e. CSI computation time) may be longer than the above scenario 1 and scenario 2, and the currently configured CSI computation time may not be sufficient for the UE to prepare the CSI report.
  • the present disclosure proposes to introduce one or more additional time durations for some UEs, which may be used by the UE for performing CSI computation.
  • the one or more additional time durations may be determined by the UE, and reported to the BS or to the network, such as by UE capability infomration. In some other embodiments, the one or more additional time durations may be determined by the BS or by the network based on the one or more additional time durations reported by the UE. For example, the BS or the network may determine one or more additional time durations based on one or more additional time durations reported from multiple UEs. In still some embodiments, the one or more additional time durations may be specified in the specification. In still some embodiments, one or more longer time durations (such as the sums of the currently used time durations plus additional time durations) may be defined.
  • the one or more time durations (which may be represented by Z 4 and Z' 4 ) with additional time durations (which may be represented by x7, x7', x8, x8', x9, and x9') may be represented as the following table:
  • ⁇ corresponds to the minimum of ⁇ PDCCH , ⁇ CSI-RS , and ⁇ UL
  • ⁇ PDCCH corresponds to the subcarrier spacing of the PDCCH with which the DCI was transmitted
  • ⁇ CSI-RS corresponds to the minimum subcarrier spacing of the aperiodic CSI-RS triggered by the DCI
  • ⁇ UL corresponds to the subcarrier spacing of the PUSCH with which the CSI report is to be transmitted.
  • the value such as "40 + x7" in the third row may correspond to the next uplink symbol with the CP starting after the end of the last symbol of the PDCCH.
  • the value such as “40” , "72" and “141” are just for illustrating, not limiting, other values may also be applied to the solutions of the present disclosure.
  • the value such as "37 + x7'" in the third row may correspond to the next uplink symbol with the CP starting after the end of the last symbol in time of the latest of:an aperiodic CSI-RS resource for channel measurements, aperiodic CSI-IM used for interference measurements, and aperiodic NZP CSI-RS for interference measurement.
  • the value such as "37” , "69” and "140” are just for illustrating, not limiting, other values may also be applied to the solutions of the present disclosure.
  • the additional time durations x7, x7', x8, x8', x9, or x9' may include a number of OFDM symbols.
  • the value of x7 may include an integral number of OFDM symbols, such as 0 OFDM symbol, 10 OFDM symbols, 18 OFDM symbols, or 37 OFDM symbols, or the like. For 0 OFDM symbol, it means no additional time duration is needed.
  • the value of x7', x8, x8', x9, and x9' may also include an integral number of OFDM symbols.
  • the value of x7 may be 37 OFDM symbols.
  • the value of x7 may be 18 OFDM symbols.
  • the additional time durations for Z 4 and Z 4 ' corresponding to the same SCS may be the same or different. That is, parameters x7 and x7' may have the same value, or may have different values. Similarly, the parameters x8 and x8' may have the same value, or may have different values, and the parameters x9 and x9' may have the same value, or may have different values.
  • x9' may have twice (or around two times, three times, four times, etc. ) the value of x8'
  • x8 may have twice (or around two times, three times, four times, etc. ) the value of x7'.
  • the above table may have more rows, for example, the value of ⁇ may be 3, 4, etc., correspondingly, the time durations (e.g. Z 4 and Z 4 ') with the additional time durations (e.g. x7, x7', x8, x8', x9, and x9') may be configured in a similar way.
  • the time durations e.g. Z 4 and Z 4 '
  • the additional time durations e.g. x7, x7', x8, x8', x9, and x9'
  • the UE may support TRP selection but not beam number combination selection.
  • the UE may also support both TRP selection and beam number combination selection, but may only perform TRP selection but not perform the beam number combination selection.
  • the UE may select N TRPs from the N TRP TRPs.
  • the UE may select N CSI-RS resources from N TRP CSI-RS resources configured by the BS, and may transmit the N selected CSI-RS resources to the BS or the network (or transmit the TRP selection) as a part of the CSI report. That is, the CSI report may include the selection of N CSI-RS resources from N TRP candidate CSI-RS resources.
  • the UE may need additional time duration for TRP selection, which may be related with the TRP selection algorithm.
  • the optimum selection schemes may be used for TRP selection, and the additional time duration may be related with possible candidate number of TRP selection (e.g. N TRP ) and the total number of supported simultaneous CSI calculations (i.e. the total number of CSI processing units (CPUs) ) .
  • the actual value may be variable because of different UE implementation, such as the processing capability allocation in parallel or in serial, and/or because of different UE capabilities or UE behaviors.
  • the UE may report one or more additional time durations (for example, one or more of the above additional time durations x7, x7', x8, x8', x9, or x9' in table 1) for TRP selection to the BS (or the network) based on realization schemes (which may be adopted by the UE or configured by the BS) and/or the UE capabilities.
  • the values for the additional time durations such as x7, x7', x8, x8', x9, or x9', may be the same or different from the values in case 1.
  • the sub-optimum selection schemes may be used for TRP selection, for example, the TRPs may be selected based on the RSRP value. In this case, there may be no need to increase the CSI computation time for TRP selection compared with the CSI computation time for CJT not supporting TRP selection. In some embodiment, in the case the one or more additional time durations for CJT supporting TRP selection are not reported, the value for the additional time durations for CJT supporting TRP selection may be 0, and the CSI computation time for CJT supporting TRP selection may be the same with the CSI computation time for CJT not supporting TRP selection.
  • the UE may support beam number combination selection but not TRP selection.
  • the UE may also support both TRP selection and beam number combination selection, but may only perform beam number combination selection but may not perform the TRP selection.
  • a set of N L combinations of values for ⁇ L 1 , ..., L NTRP ⁇ may be configured by the BS via a higher-layer signaling, (e.g. an RRC signaling) .
  • the beam number combination number N L > 1 the selected combination of values for ⁇ L 1 , ..., L NTRP ⁇ may be reported by an indicator in a CSI report.
  • N TRP configured for CJT may be 2, 3, or 4
  • the candidate beam number combination N L may be 1, 2, or 4.
  • additional UE realization complexity is related with the beam selection algorithm.
  • the additional time duration may be used for beam combination selection and the actual time may be related with beam selection algorithm.
  • the optimum beam selection schemes may be used, additional CSI computation time is related with beam combination number N L and CPU number used for beam number combination selection.
  • the actual value may be variable because of different UE implementation, and/or because of different UE capabilities.
  • the UE may report one or more additional time durations (for example, one or more of the above additional time durations x7, x7', x8, x8', x9, or x9' in table 1) based on the realization schemes (which may be adopted by the UE or configured by the BS) and/or the UE capabilities.
  • the values for the additional time durations such as x7, x7', x8, x8', x9, or x9', may be the same or different from the values in case 1 or case 2.
  • the sub-optimum beam number combination selection schemes may be used.
  • the beam number combination may be selected based on the singular value corresponding beam. In this case, there may be no need to increase CSI computation time for beam number combination selection compared with the CSI computation time for CJT not supporting beam number combination selection.
  • the value for the additional time durations for CJT supporting beam number combination selection may be 0, and the CSI computation time for CJT supporting beam number combination selection may be the same with the CSI computation time for CJT not supporting beam number combination selection.
  • the UE may perform both TRP selection and beam number combination selection.
  • the designs for additional time durations described in case 2 and case 3 may be combined.
  • the additional time durations (such as one or more of the above additional time durations x7, x7', x8, x8', x9, or x9' in table 1) may be reported by the UE in the case that the UE may support both TRP selection and beam number combination selection.
  • the additional time durations may be value 0 for special sub-optimum realization schemes.
  • the value for the additional time durations for CJT supporting both TRP selection and beam number combination selection may be 0, and the CSI computation time for CJT supporting both TRP selection and beam number combination selection may be the same with the CSI computation time for CJT not supporting beam number combination selection.
  • the additional time duration x7 for case 1 may be with the smallest value
  • the additional time duration x7 for case 4 may be with the largest value.
  • These additional time durations may be determined by the UE, and reported to the BS or to the network, such as by UE capability, or may be determined by the BS or by the network based on the one or more additional time durations reported by the UE, or may be specified in the specification.
  • One or more additional time durations may be reported to BS, such as UE capability, corresponding one or more aspects including a TRP number, a CSI-RS port number, a TRP selection, or a beam number combination selection, respectively.
  • the UE may be configured to perform discontinuous reception (i.e. the UE may receive configuration information of DRX) .
  • the CSI-RS resource set for non-CJT may be configured with two resource groups and a number of resource pairs, the UE may transmit a CSI report only if receiving at least one CSI-RS transmission occasion for each CSI-RS resource in a resource pair within the same DRX active time no later than CSI reference resource and drops the report otherwise.
  • the configured N TRP CSI-RS resources may be located in two consecutive slots, for example slot n and slot n+1.
  • some CSI-RS resources may be received no later than CSI reference resource and other CSI-RS resources (e.g. in slot n+1) may be received later than CSI reference resource.
  • the present disclosure proposes some solutions for the UE to perform the CSI report as follows:
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the UE when at least one CSI-RS transmission occasion for each CSI-RS resource in the CSI-RS resource set for CMR is within the same DRX active time no later than the CSI reference resource, the UE may transmit a CSI report.
  • the UE when at least one CSI-RS transmission occasion for each CSI-RS resource in slot n and each CSI-RS resource in slot n+1 if existed is within the same DRX active time earlier than or at the same time as the CSI reference resource, the UE may transmit the CSI report. Otherwise, the UE may not transmit the CSI report.
  • the transmission occasion may be defined based on each CSI-RS resource in this embodiment. Also, it may be defined based on CSI-RS resource set, where all the CSI-RS resources in one CSI-RS resource set share the same transmission occasion.
  • the CSI-RS resource set including a CSI-RS resource 1 in slot n and a CSI-RS resource 2 in slot n+1.
  • There is a CSI-RS transmission occasion 1 for CSI-RS resource 1 is within the same DRX active time no later than CSI reference resource
  • a CSI-RS transmission occasion 2 for CSI-RS resource 2 is also within the same DRX active time no later than CSI reference resource, and the UE may transmit the CSI report.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the UE may transmit a CSI report.
  • a CSI-RS resource 1 in the CSI-RS resource set that is in slot n there is a CSI-RS transmission occasion 1 for CSI-RS resource 1 is within the same DRX active time no later than CSI reference resource
  • a CSI-RS transmission occasion 2 for CSI-RS resource 1 is within the same DRX active time later than CSI reference resource
  • the UE may transmit the CSI report.
  • the TRP selection may be performed among the CSI-RS resource no later than CSI reference resources. That is, the TRP selection may be performed among the CSI-RS resources including CSI-RS resource 1, but not including CSI-RS resource 2.
  • the UE may not transmit a CSI report.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the UE may transmit a CSI report.
  • the UE may perform the TRP selection with no restriction, which means the TRP selection may be performed among the CSI-RS resources later or no later than the CSI reference resource.
  • the TRP selection may be performed among the CSI-RS resources including both CSI-RS resource 1 (no later than the CSI reference resource) and CSI-RS resource 2 (later than the CSI reference resource) .
  • Fig. 3 illustrates a method performed by a UE for CJT according to some embodiments of the present disclosure.
  • Fig. 4 illustrates a method performed by a BS for CJT corresponding to the method performed by the UE as shown in Fig. 3 according to some embodiments of the present disclosure.
  • the UE may receive configuration information indicating a number of CSI-RS resource in a CSI-RS resource set as channel measurement resources, that is, the UE may be configured to perform CJT; in operation 302, the UE may determine a first symbol associated with a first additional time duration and a second symbol associated with a second additional time duration; and in operation 303, the UE may transmit, via the transceiver, a CSI report in the case that an uplink transmission carrying the CSI report is later than or at the same time with the first symbol after an end of a last symbol of a PDCCH which triggers the CSI report; and in the case that uplink transmission carrying the CSI report is later than or at the same time with the second symbol after an end of a last symbol of an aperiodic CSI-RS resource for channel measurements, an aperiodic CSI-IM used for an interference measurement, and an aperiodic NZP CSI-RS for an interference measurement.
  • the BS may transmit configuration information indicating a number of CSI-RS resource in a CSI-RS resource set as channel measurement resources; in operation 402, the BS may determine a first symbol associated with a first additional time duration and a second symbol associated with a second additional time duration; and in operation 403, the BS may receive, via the transceiver, a CSI report in the case that an uplink transmission carrying the CSI report is later than or at the same time with the first symbol after an end of a last symbol of a PDCCH which triggers the CSI report; and in the case that uplink transmission carrying the CSI report is later than or at the same time with the second symbol after an end of a last symbol of an aperiodic CSI-RS resource for channel measurements, an aperiodic CSI-IM used for an interference measurement, and an aperiodic NZP CSI-RS for an interference measurement.
  • the first symbol is determined by a third symbol defined by the specification and the first additional time duration
  • the second symbol is determined by a fourth symbol defined by the specification and the second additional time duration.
  • the first symbol may be "40+x7" as shown in the third row, it is determined by the third symbol (with a value 40, which may be defined by the specification) and the first additional time duration (which may be x7)
  • the second symbol may be "37+x7" as shown in the third row, it is determined by the fourth symbol (with a value 37, which may be defined by the specification) and the second additional time duration (which may be x7') .
  • the first additional time duration or the second additional time duration includes a first time period.
  • a value of the threshold is 8 in the case that 3 TRPs or 4 TRPs are configured; or a value of the threshold is 16 in the case that 2 TRPs are configured.
  • the first additional time duration or the second additional time duration includes a second time period.
  • the first additional time duration or the second additional time duration includes a third time period.
  • the UE may transmit UE capability information, to the BS, which may indicate one or more additional time durations, wherein the one or more additional time durations includes a first time period, a second time period or a third time period.
  • the UE may transmit the UE capability information which may indicate one of more of the above x7, x7', x8, x8', x9, and x9'.
  • the first additional time duration or the second additional time duration is determined from one or more additional time durations reported by the UE, predetermined by a specification, or configured by a base station (BS) based on the one or more additional time durations reported by the UE.
  • BS base station
  • the first additional time duration or the second additional time duration is associated with a minimum SCS of the following:
  • the first additional time duration or the second additional time duration includes a number of OFDM symbols. For example, 10 OFDM symbols, 18 OFDM symbols, etc.
  • the first additional time duration and the second additional time duration have the same value.
  • the first additional time duration and the second additional time duration are scalable based on different SCSs.
  • Fig. 5 illustrates a method performed by a UE for CJT according to some embodiments of the present disclosure.
  • Fig. 6 illustrates a method performed by a BS for CJT corresponding to the method performed by the UE as shown in Fig. 5 according to some embodiments of the present disclosure.
  • the UE may receive configuration information indicating a number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and in operation 502, the UE may transmit a CSI report based on time relation between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX active time duration.
  • the BS may transmit configuration information indicating a number of CSI-RS resources in a CSI-RS resource set and configuration information of DRX; and in operation 602, the BS may receive a CSI report based on time relation between the number of CSI-RS resources in the CSI-RS resource set and a CSI reference resource, wherein at least one CSI-RS resource in the CSI-RS resource set is within the DRX active time duration.
  • the CSI report is only transmitted in the case that a CSI-RS transmission occasion for each CSI-RS resource in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain.
  • the CSI report is transmitted in the case that a first CSI-RS transmission occasion for a first CSI-RS resource (s) in the CSI resource-RS set is earlier than or at the same time with the CSI reference resource in the time domain, and wherein a second CSI-RS transmission occasion for a second CSI-RS resource (s) in the CSI-RS resource set is later than the CSI reference resource in the time domain; or in the case that a first CSI-RS transmission occasion for a first CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain, and a second CSI-RS transmission occasion for a second CSI-RS resource (s) in the CSI-RS resource set is earlier than or at the same time with the CSI reference resource in the time domain.
  • the CSI report is based on the first CSI-RS resource in the CSI resource set.
  • the CSI report is based on the first CSI-RS resource in the CSI resource set, or both the first CSI-RS resource and the second CSI-RS resource in the CSI resource set.
  • Fig. 7 illustrates a simplified block diagram of an apparatus according to some embodiments of the present disclosure.
  • an example of the apparatus 700 may include at least one processor 704 and at least one transceiver 702 coupled to the processor 704.
  • the apparatus 700 may be a UE, a BS, or any other device with similar functions.
  • the transceiver 702 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry.
  • the apparatus 700 may further include an input device, a memory, and/or other components.
  • the apparatus 700 may be a UE.
  • the transceiver 702 and the processor 704 may interact with each other so as to perform the operations of the UE described in any of Figs. 1-6.
  • the apparatus 700 may be a BS.
  • the transceiver 702 and the processor 704 may interact with each other so as to perform the operations of the BS described in any of Figs. 1-6.
  • the apparatus 700 may further include at least one non-transitory computer-readable medium.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 704 to implement the method with respect to the UE as described above.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 704 to implement the method with respect to the BS as described above.
  • controllers, flowcharts, and modules may also be implemented on a general purpose or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit such as a discrete element circuit, a programmable logic device, or the like.
  • any device that has a finite state machine capable of implementing the flowcharts shown in the figures may be used to implement the processing functions of the present disclosure.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande concerne des procédés et des appareils de calcul et de rapport d'informations sur l'état du canal (CSI) pour une transmission conjointe cohérente (CJT). Un mode de réalisation de la présente divulgation concerne un équipement utilisateur (UE) comprenant : un émetteur-récepteur ; et un processeur accouplé à l'émetteur-récepteur et conçu pour : recevoir, par l'intermédiaire de l'émetteur-récepteur, des informations de configuration indiquant un nombre de ressources CSI-RS (signal de référence d'informations sur l'état du canal) dans un ensemble de ressources CSI-RS comme ressources de mesure de canal ; déterminer un premier symbole associé à une première durée supplémentaire et un second symbole associé à une seconde durée supplémentaire ; et transmettre, par l'intermédiaire de l'émetteur-récepteur, un rapport de CSI dans le cas où une transmission de liaison montante transportant le rapport de CSI est simultanée ou ultérieure au premier symbole après une fin d'un dernier symbole d'un canal de commande de liaison descendante physique (PDCCH) qui déclenche le rapport de CSI ; et dans le cas où une transmission de liaison montante transportant le rapport de CSI est simultanée ou ultérieure au second symbole après une fin d'un dernier symbole d'une ressource CSI-RS apériodique pour des mesures de canal, une mesure d'interférence de mesure de canal apériodique (CSI-IM) utilisée pour une mesure d'interférence, et un CSI-RS de puissance non nulle (NZP) apériodique pour une mesure d'interférence.
PCT/CN2023/094130 2023-05-15 2023-05-15 Procédés et appareils de calcul et de rapport de csi pour une transmission conjointe cohérente WO2024087587A1 (fr)

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CN114556822A (zh) * 2019-10-17 2022-05-27 高通股份有限公司 信道状态信息的预测性估计的csi参考资源和csi目标资源的配置
US20220295498A1 (en) * 2021-03-15 2022-09-15 Samsung Electronics Co., Ltd. Method and apparatus for aperiodic csi measurement and reporting
WO2022195560A1 (fr) * 2021-03-18 2022-09-22 Lenovo (Singapore) Pte. Ltd. Notification d'informations statistiques d'état de canal dans un rapport

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CN114556822A (zh) * 2019-10-17 2022-05-27 高通股份有限公司 信道状态信息的预测性估计的csi参考资源和csi目标资源的配置
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