Mobility Enhancement Rel-19

 RAN1#118

9.9      NR mobility enhancements Phase 4

Please refer to RP-241515 for detailed scope of the WI.

[118-R19-Mobility] – Yosuke (Fujitsu)

Email discussion on channel modelling for NR mobility enhancement

-        To be used for sharing updates on online/offline schedule, details on what is to be discussed in online/offline sessions, tdoc number of the moderator summary for online session, etc

R1-2406860         Work plan for Rel-19 Further NR Mobility Enhancements              Apple, China Telecom

9.9.11       Measurements related enhancements for LTM

R1-2405859         Measurements related enhancements for LTM       Huawei, HiSilicon

Decision: The document is noted.

R1-2406527         Discussion on measurements related enhancements for LTM              Fujitsu

Decision: The document is noted.

R1-2405924         Discussion on measurements related enhancements for LTM              Spreadtrum Communications

R1-2406001         Discussion on measurements related enhancements for LTM              CMCC

R1-2406032         Discussion on measurements related enhancements for LTM              ZTE Corporation, Sanechips

R1-2406063         Discussion on measurements related enhancements for LTM    LG Electronics

R1-2406200         Views on measurements related enhancements for LTM              vivo

R1-2406264         Discussions on measurement enhancement for LTM   OPPO

R1-2406303         Measurements related enhancements for LTM            Xiaomi

R1-2406386         Discussion on measurements related enhancements for LTM              CATT

R1-2406432         Measurements enhancements for LTM          TCL

R1-2406458         Measurements related enhancements for LTM            InterDigital, Inc.

R1-2406486         Measurements related enhancements for LTM            Sony

R1-2406525         Measurements related enhancements for LTM            Lenovo

R1-2406668         Views on Rel-19 measurement related enhancements for LTM              Samsung

R1-2406697         Discussion on measurements related enhancements for LTM              NEC

R1-2406737         Discussion on NR mobility enhancement based on CSI-RS measurements     ETRI

R1-2406769         LTM measurements related enhancements    MediaTek Inc.

R1-2406791         Measurement related enhancements for LTM              Nokia

R1-2406861         Measurements enhancements for LTM          Apple

R1-2406947         Discussion on measurement related enhancements for LTM              NTT DOCOMO, INC.

R1-2406966         Discussion on measurement related enhancements for LTM              KDDI Corporation

R1-2407047         Measurement related enhancement for LTM Qualcomm Incorporated

R1-2407053         Discussion on measurements related enhancements for LTM              Sharp

R1-2407115         Discussion on measurements related enhancements for LTM              Google

R1-2407146         Measurement related enhancements for LTM              Ericsson

R1-2407318         FL summary 1 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Tuesday session

Agreement

Support L1-RSRP measurement based on CSI-RS.

FFS: Support L1-SINR measurement based on CSI-RS.

Agreement

Explicit configuration of CSI-RS resource(s) for candidate cell(s) for L1-measurement is supported.

Agreement

CSI-RS based L1-RSRP report is supported for gNB scheduled measurement reporting.

FFS: CSI-RS based L1-SINR report is supported for gNB scheduled measurement reporting.

Rel-18 LTM CSI reporting framework is the baseline for CSI-RS based L1-measurement report by gNB scheduled measurement reporting.

Agreement

SSB based L1-RSRP measurements is supported for event triggered reporting.

CSI-RS based L1-RSRP measurements is supported for event triggered reporting.

FFS: CSI-RS based L1-SINR measurements is supported for event triggered reporting.

Proposal

From RAN1 point of view, [MAC CE/UCI/Both MAC CE and UCI] is/are recommended as a container for event triggered reporting for LTM

·       Support MAC CE (10): Google, Nokia, NTT DOCOMO, ZTE, MediaTek, Fujitsu, InterDigital, Qualcomm, Ericsson, OPPO

·       Support UCI (11): Apple, Google, ZTE, Samsung, CATT, CMCC, Sony, LG Electronics, InterDigital, ITRI, Sharp

R1-2407319         FL summary 2 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Thursday session

Agreement

For gNB scheduled reporting and event triggered reporting

• At least periodic CSI-RS is supported for L1-RSRP measurement for candidate cell
• FFS: aperiodic and semi-persistent CSI-RS
• At least CSI-RS for beam management is supported for L1-RSRP measurement for candidate cell
• FFS: CSI-RS for mobility

Agreement

• For the identification of the serving cell RS for event evaluation,
• At least the following options are further studied in RAN1, where different options could apply to different LTM event
• Option. 1: Derived from QCL (type-D) RS(s) of the indicated joint/DL TCI state for the serving cell
• Option. 2: Derived from QCL RS(s) or SSB QCLed with the QCL RS of the indicated joint/DL TCI state for the serving cell
• QCL RS or SSB is configured by the network
• Option. 3: Measurement RS(s) is/are explicitly configured
• Option. 4: Derived from QCL RSs of activated TCI states with the best quality, or SSB which is QCLed with the QCL RSs of activated TCI states with the best quality.
• Option 6: Derived from QCL RSs of activated TCI states, or SSB which is QCLed with the QCL RSs of activated TCI states
• The RSs of the candidate cell(s) for event evaluation are explicitly configure
• Note: Companies are encouraged to take into account the RAN2 agreement (i.e current beam rather than best beam) for their further study.

Final summary in R1-2407445.

 RAN1#118-bis

9.9      NR mobility enhancements Phase 4

Please refer to RP-242356 for detailed scope of the WI.

[118bis-R19-Mobility] – Yosuke (Fujitsu)

Email discussion on channel modelling for NR mobility enhancement

-        To be used for sharing updates on online/offline schedule, details on what is to be discussed in online/offline sessions, tdoc number of the moderator summary for online session, etc

9.9.11       Measurements related enhancements for LTM

R1-2407658         Measurements related enhancements for LTM            Huawei, HiSilicon

R1-2407719         Discussion on measurements related enhancements for LTM              Spreadtrum Communications

R1-2407777         Discussion on measurements related enhancements for LTM              ZTE Corporation, Sanechips

R1-2407876         Discussion on measurements related enhancements for LTM              vivo

R1-2407918         Discussion on measurements related enhancements for LTM              CMCC

R1-2407981         Measurements related enhancements for LTM            Xiaomi

R1-2408062         Discussion on measurements related enhancements for LTM              CATT

R1-2408090         Discussion on measurements related enhancements for LTM    LG Electronics

R1-2408168         Discussions on measurement enhancement for LTM   OPPO

R1-2408203         Measurements related enhancements for LTM            Lenovo

R1-2408305         Discussion on measurement related enhancements for LTM              Lekha Wireless Solutions

R1-2408353         Measurement related enhancements for LTM              Panasonic

R1-2408356         FL plan for mobility enhancements in RAN1#118bis  Moderator (Fujitsu)

R1-2408372         Discussion on measurements related enhancements for LTM              Google

R1-2408379         Discussion on measurements related enhancements for LTM              NEC

R1-2408423         Measurements related enhancements for LTM            Sony

R1-2408433         Measurements related enhancements for LTM            InterDigital, Inc.

R1-2408486         Measurements enhancements for LTM          Apple

R1-2408497         Measurements enhancements for LTM          TCL

R1-2408508         Discussion on measurement related enhancements for LTM              Fujitsu Limited

R1-2408542         Discussion on measurements related enhancements for LTM              Sharp

R1-2408577         Discussion on measurements related enhancements for LTM              ETRI

R1-2408605         Measurement related enhancements for LTM              Ericsson

R1-2408661         Views on Rel-19 measurement related enhancements for LTM              Samsung

R1-2408714         LTM measurements related enhancements    MediaTek Inc.

R1-2408722         Measurement related enhancements for LTM              Nokia

R1-2408800         Discussion on measurement related enhancements for LTM              NTT DOCOMO, INC.

R1-2408865         Measurements related enhancement for LTM              Qualcomm Incorporated

R1-2408886         Discussion on measurements related enhancements for LTM              KDDI Corporation

R1-2408357         FL summary 1 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Monday session

Agreement

The agreement “Rel-18 LTM CSI reporting framework is the baseline for CSI-RS based L1-measurement report by gNB scheduled measurement reporting” made in RAN#118 is further clarified for L1-RSRP as follows:

·       UCI format defined in Table 6.3.1.1.2-8C of TS38.212 can be used by replacing SSBRI with CRI.

·       Whether the L1-RSRP(s) of serving cell is always included is configurable (in line with Rel-18)

·       The quantization method defined in clause 5.2.1.4.3 of TS38.214 and bit width defined in Table 6.3.1.1.2-6 of TS38.212 can be used

·       No L1 specified filtering for time and spatial domain is introduced

·       No enhancement on how to report L cells x M beams

·       Periodic reporting on PUCCH is supported

o    FFS: semi-persistent reporting on PUCCH/PUSCH, and aperiodic reporting on PUSCH

Agreement

From RAN1 perspective, there is no restriction with regards to the frequency location of CSI-RS used for L1-measurement.

R1-2408358         FL summary 2 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Wednesday session

Agreement

For CSI-RS based L1-measurement report by gNB scheduled measurement reporting, semi-persistent reporting on PUCCH/PUSCH and aperiodic reporting on PUSCH are supported.

Agreement

The serving cell RS for event evaluation is at least derived from QCL RS or SSB QCLed with the QCL RS of the indicated joint/DL TCI state for the serving cell

• QCL RS above is the RS w.r.t. QCL-TypeD when the indicated joint/DL TCI state is configured with two QCL RSs.
• FFS: Details on determination of QCL RS or SSB QCLed with QCL RS.

Note: This does not imply the support of mTRP scenarios.

R1-2408359         FL summary 3 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Thursday session

Conclusion

There is no consensus in RAN1 on the support L1-SINR measurement based on CSI-RS for candidate cells.

Agreement

The following alternatives are further studied:

·       Alt-1: CSI-RS measurement and CSI reporting operations are performed before reception of LTM Cell Switch Command (CSC) MAC CE.

o   The report is sent to the serving cell and transferred to the candidate/target cell(s)

·       Alt-2: CSI-RS measurement can start before reception of LTM CSC MAC CE and CSI reporting operation is performed after reception of LTM CSC MAC CE.

o   The report is sent directly to target cell

·       Alt-3: CSI-RS measurement and CSI reporting operations are performed after reception of LTM CSC MAC CE.

o   The report is sent directly to target cell

Companies are requested to provide the details of exact report timing and triggering mechanism in the next meeting.

Working Assumption

In addition to periodic CSI-RS, semi-persistent CSI-RS is supported for candidate cell L1-RSRP measurement for gNB scheduled reporting from RAN1 perspective

·       Send an LS to RAN3 (CC RAN2) to ask for the feasibility of specifying the signalling for coordination between serving cell and candidate cell(s) on the transmission of semi-persistent CSI-RS(s) and any other potential issues (e.g. RAN3 workload).

Support of semi-persistent CSI-RS is subject to UE capability.

Comeback for final LS.

R1-2409282         [draft] LS on the support of semi-persistent CSI-RS resource for LTM candidate cells  Moderator (Fujitsu)

Friday decision: The draft LS is endorsed. Final LS is approved in R1-2409283.

R1-2408360         Final FL summary of Measurements related enhancements for LTM      Moderator (Fujitsu)

 RAN1#119

9.9      NR mobility enhancements Phase 4

Please refer to RP-242356 for detailed scope of the WI.

[119-R19-Mobility] – Yosuke (Fujitsu)

Email discussion on channel modelling for NR mobility enhancement

-        To be used for sharing updates on online/offline schedule, details on what is to be discussed in online/offline sessions, tdoc number of the moderator summary for online session, etc

9.9.11       Measurements related enhancements for LTM

R1-2409381         Discussion on measurements related enhancements for LTM              ZTE Corporation, Sanechips

R1-2409422         Measurements related enhancements for LTM            Huawei, HiSilicon

R1-2409492         Discussion on measurements related enhancements for LTM    LG Electronics

R1-2409525         Discussion on measurements related enhancements for LTM              CMCC

R1-2409612         Views on Rel-19 measurement related enhancements for LTM              Samsung

R1-2409648         Discussion on measurements related enhancements for LTM              Spreadtrum, UNISOC

R1-2409696         Discussion on measurements related enhancements for LTM              vivo

R1-2409771         Measurement related enhancements for LTM              Nokia

R1-2409820         Measurement related enhancements for LTM              Apple

R1-2409909         Discussion on measurements related enhancements for LTM              Xiaomi

R1-2409956         Discussion on measurements related enhancements for LTM              CATT

R1-2409973         Measurements related enhancements for LTM            Lenovo

R1-2409975         Measurement related enhancements for LTM              Ericsson

R1-2409991         Discussion on measurement related enhancements for LTM              Lekha Wireless Solutions

R1-2410017         Measurements related enhancements for LTM            InterDigital, Inc.

R1-2410041         Measurements enhancements for LTM          TCL

R1-2410115         Discussions on measurement enhancement for LTM   OPPO

R1-2410124         Discussion on measurement related enhancements for LTM              Fujitsu Limited

R1-2410168         Discussion on measurements related enhancements for LTM              Google

R1-2410212         Discussion on measurements related enhancements for LTM              NEC

R1-2410238         Measurements related enhancements for LTM            Sony

R1-2410244         LTM measurements related enhancements    MediaTek Inc.

R1-2410276         Measurements related enhancements for LTM            ETRI

R1-2410348         Measurement Enhancements for LTM           Meta

R1-2410403         Discussion on measurement related enhancements for LTM              NTT DOCOMO, INC.

R1-2410432         Discussion on measurements related enhancements for LTM              KDDI Corporation

R1-2410493         Measurements related enhancement for LTM              Qualcomm Incorporated

R1-2410543         Discussion on measurements related enhancements for LTM              Sharp

R1-2410186         FL summary 1 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Monday session

Agreement

For the identification of the serving cell RS for event evaluation,

If the RS(s) for candidate cell(s) are CSI-RS configured in a CSI-RS resource set configured with repetition, QCL RS of the indicated TCI-state is used for the serving cell; otherwise, SSB QCLed with QCL RS of the indicated TCI-state is used for the serving cell.

·       UE does not expect the following configuration:

o   CSI-RS resource in the indicated TCI state of serving cell is NOT configured in a CSI-RS resource set configured with repetition, and

o   CSI-RS is configured as measurement resource for the candidate cell(s).

Agreement

CSI-RS for BM as the referenceSignal with QCL-TypeD is supported for an LTM TCI state, where TRS is configured as referenceSignal with QCL-TypeA

R1-2410187         FL summary 2 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Wednesday session (declared as WA in Thursday session with the modified red text)

Working Assumption

As baseline, CSI-RS measurement and CSI reporting operations are performed after reception of LTM CSC MAC CE.

-        The report is sent directly to target cell

-        Introduce UE capability for CSI-RS measurement can start before reception of LTM CSC MAC CE

o   Other than UE capability, there is no strive for no additional spec impact compared to the baseline (only one triggering mechanism will be specified)

R1-2410188         FL summary 3 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Thursday session

Conclusion

·       No consensus to support CSI-RS for mobility for L1 measurement in Rel-19 LTM.

·       Note: From the actual gNB transmission viewpoint, CSI-RS for mobility and CSI-RS for BM may be the same.

Final summary in R1-2410189.

 RAN1#120

9.9      NR mobility enhancements Phase 4

Please refer to RP-242356 for detailed scope of the WI.

[120-R19-Mobility] – Yosuke (Fujitsu)

Email discussion on channel modelling for NR mobility enhancement

-        To be used for sharing updates on online/offline schedule, details on what is to be discussed in online/offline sessions, tdoc number of the moderator summary for online session, etc

9.9.11       Measurements related enhancements for LTM

R1-2500081         Measurements related enhancements for LTM            Huawei, HiSilicon

R1-2500180         Discussion on measurements related enhancements for LTM              Spreadtrum, UNISOC

R1-2500238         Views on measurements related enhancements for LTM              CATT

R1-2500245         Discussion on measurements related enhancements for LTM              ZTE Corporation, Sanechips

R1-2500253         Discussion on measurements related enhancements for LTM    LG Electronics

R1-2500299         Discussion on measurements related enhancements for LTM              CMCC

R1-2500318         Measurements enhancements for LTM          TCL

R1-2500364         Discussion on measurements related enhancements for LTM              vivo

R1-2500415         Measurement related enhancements for LTM              Nokia

R1-2500475         Discussions on measurement enhancement for LTM   OPPO

R1-2500562         Discussion on measurement related enhancements for LTM              Lekha Wireless Solutions

R1-2500624         Discussion on measurements related enhancements for LTM              NEC

R1-2500631         Discussion on measurement related enhancements for LTM              Fujitsu

R1-2500641         Measurements related enhancements for LTM            InterDigital, Inc.

R1-2500662         Measurements related enhancements for LTM            Sony

R1-2500703         Measurements related enhancements for LTM            Lenovo

R1-2500744         Discussion on measurements related enhancements for LTM              Xiaomi

R1-2500803         Measurement related enhancements for LTM              Apple

R1-2500864         Views on Rel-19 measurement related enhancements for LTM              Samsung

R1-2500918         Discussion on measurements related enhancements for LTM              ETRI

R1-2500992         Measurement related enhancements for LTM              Ericsson

R1-2501086         Measurement Enhancements for LTM           Meta

R1-2501091         Discussion on measurements related enhancements for LTM              KDDI Corporation

R1-2501170         Measurements related enhancement for LTM              Qualcomm Incorporated

R1-2501214         Discussion on measurement related enhancements for LTM              NTT DOCOMO, INC.

R1-2501244         Discussion on measurements related enhancements for LTM              Sharp

R1-2501315         LTM measurements related enhancements    MediaTek

R1-2501337         Discussion on measurements related enhancements for LTM              Google

R1-2500419         FL plan for mobility enhancements in RAN1#120       Moderator (Fujitsu)

R1-2500420         FL summary 1 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Monday session

Agreement

• Confirm the following working assumption made in RAN1#118bis

Working Assumption(RAN1#118bis)

In addition to periodic CSI-RS, semi-persistent CSI-RS is supported for candidate cell L1-RSRP measurement for gNB scheduled reporting from RAN1 perspective

Send an LS to RAN3 (CC RAN2) to ask for the feasibility of specifying the signalling for coordination between serving cell and candidate cell(s) on the transmission of semi-persistent CSI-RS(s) and any other potential issues (e.g. RAN3 workload).

Support of semi-persistent CSI-RS is subject to UE capability.

• MAC CE is used to activate/deactivate the semi-persistent CSI-RS resource similarly to the legacy mechanism for a serving cell which will be specified in RAN2

Send an LS to RAN2 to inform about this agreement.

R1-2501499         [Draft] LS on activation/deactivation of semi-persistent CSI-RS resource for LTM candidate cells Moderator (Fujitsu)

Thursday decision: The draft LS is endorsed. Final LS is approved in R1-2501500.

Conclusion

There is no RAN1 consensus to support SP CSI-RS for event triggered reporting.

Conclusion

There is no consensus on the support of aperiodic CSI-RS resource for gNB scheduled reporting or event triggered reporting.

Agreement

The parameters defined in legacy NZP-CSI-RS-resource can be different for CSI-RS resources associated with the resource set.

Agreement

An LTM report configuration for L1-RSRP is associated with a single resource config that includes:

• Alt.A: a single resource set containing CSI-RS resources corresponding to multiple candidate cells. i.e., the same design as that of SSB in Rel-18 LTM.
• FFS: how to associate between the measurement CSI-RS resources and candidate cells
• explicit or implicit signaling of candidate cells

R1-2500421         FL summary 2 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Thursday session

Conclusion

There is no consensus in RAN1 to support specified filtering of L1-RSRP for LTM.

Send an LS to RAN2 to inform that L1 filtering is up to UE implementation.

R1-2501576         [Draft] LS on L1filtering for LTM event triggered reporting              Moderator (Fujitsu)

Thursday decision: The draft LS is endorsed. Final LS is approved in R1-2501577.

Agreement

For target cell CSI acquisition,

• A UE is provided with RRC configurations for periodic CSI-RS resource(s) and CSI report(s) for one or more candidate cell
• For a candidate cell,
• down-select from the following alternatives:
• Alt 1: A single CSI report configuration is configured
• Alt 2: Multiple CSI report configurations can be configured
• down-select from the following alternatives:
• Alt X: A single CSI-RS resource for CMR is associated with a CSI report configuration
• Alt Y: Multiple CSI-RS resources for CMR can be associated with a CSI report configuration
• FFS: Semi-persistent CSI-RS resource
• After the RRC configuration and before the reception of CSC, the UE may measure CSI based on the configured CSI-RS resource(s), which is subject to UE capability
• FFS: whether or how to select a subset of CSI-RS resources to measure
• FFS: when the UE may start measuring the configured CSI-RS resources
• UE determines the CSI report configuration based on the CSC
• After the reception of cell switch command, the UE may measure (depending on the timeline) CSI-RS resource(s) associated with determined CSI report configuration
• The latest available measured CSI on target cell resource(s) is conveyed at least by a single report, and the report is sent to the target cell
• Option 1: to use UCI
• Option 2: to use MAC CE

Note: with this agreement, the working assumption made in RAN1#119 is automatically confirmed.

Conclusion

The following is up to RAN2: Coexistence of LTM event triggered reporting and mTRP operation at serving cells.

For future meetings:

Companies are encouraged to check with their RAN2 colleagues if there are any issues for RS type determination for event LTM2. Come back in RAN1#120bis if necessary.

Final FL summary in R1-2500423.

 RAN1#120-bis

9.9       NR mobility enhancements Phase 4

Please refer to RP-250339 for detailed scope of the WI.

Rapporteur to provide initial input on higher layer signalling under agenda item 9.9. For input on higher layer signalling from any other source, please include it as part of your tdoc to relevant sub-agenda items.

[120bis-R19-Mobility] – Yosuke (Fujitsu)

Email discussion on channel modelling for NR mobility enhancement

-        To be used for sharing updates on online/offline schedule, details on what is to be discussed in online/offline sessions, tdoc number of the moderator summary for online session, etc

R1-2502627         Higher layer parameters for Rel-19 NR mobility enhancements Ph4      Rapporteur (Apple)

R1-2503140         Summary of RRC parameters for NR mobility enhancement WI for RAN1 120bis meeting Rapporteur (Apple)

9.9.11        Measurements related enhancements for LTM

R1-2501756         Discussion on measurements related enhancements for LTM   LG Electronics

R1-2501784         Discussion on measurements related enhancements for LTM   ZTE Corporation, Sanechips

R1-2501821         Discussion on measurements related enhancements for LTM   vivo

R1-2501849         Discussion on LTM enhancements TCL

R1-2501879         Discussion on measurements related enhancements for LTM   Spreadtrum, UNISOC

R1-2501956         Discussion on measurement related enhancements for LTM     Lekha Wireless Solutions

R1-2502006         Discussions on measurements related enhancements for LTM  CATT

R1-2502087         FL plan for mobility enhancements in RAN1#120bis Moderator (Fujitsu)

R1-2502111         Measurements related enhancements for LTM            Lenovo

R1-2502132         Discussion on measurement related enhancements for LTM     Fujitsu

R1-2502172         Discussion on measurements related enhancements for LTM   CMCC

R1-2502201         Discussion on measurements related enhancements for LTM   NEC       Late submission

R1-2502206         Measurements related enhancements for LTM            InterDigital, Inc.

R1-2502214         Measurements related enhancements for LTM            Huawei, HiSilicon

R1-2502298         Discussions on measurement enhancement for LTM  OPPO

R1-2502329         Measurements related enhancements for LTM            Sony

R1-2502382         Views on Rel-19 measurement related enhancements for LTM Samsung

R1-2502453         Discussion on measurements related enhancements for LTM   Xiaomi

R1-2502490         Discussion on measurements related enhancements for LTM   Sharp

R1-2502518         Discussion on measurements related enhancements for LTM   ETRI

R1-2502562         Measurement related enhancements for LTM              Ericsson

R1-2502628         Measurement related enhancements for LTM              Apple

R1-2502653         Measurement related enhancements for LTM              Nokia

R1-2502749         Discussion on measurements related enhancements for LTM   KDDI Corporation

R1-2502778         Discussion on measurement related enhancements for LTM     NTT DOCOMO, INC.

R1-2502853         Measurements related enhancement for LTM              Qualcomm Incorporated

R1-2502891         Discussion on measurements related enhancements for LTM   Google

R1-2502929         LTM measurements related enhancements    MediaTek

R1-2502088        FL summary 1 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Monday session

Agreement

• Repetition=off is supported for candidate cell CSI-RS in Rel-19.
• Repetition=on is not supported for candidate cell CSI-RS in Rel-19.

Conclusion

RAN1 assumes the SSB QCLed with CSI-RS is used for timing reference of candidate cell CSI-RS measurement in LTM.

Agreement

In the resource set configured for candidate cell L1-RSRP measurement, a sequence of candidate cell indices is included together with a sequence of CSI-RS resource indices, where each CSI-RS resource index is associated with one candidate cell index.

Agreement

Regarding the LS from RAN2 (R1-2501686) the following contents are included in the reply LS.

·        RAN1 assumes at maximum 16 beams can be reported by a single event triggered reporting.

o   Regardless whether or not the report includes the current beam.

o   Note: The maximum number of beams that can be reported by a UE subject to UE capability is under discussion in RAN1.

R1-2503076        [Draft] Reply LS on number of beam measurements in the measurement report MAC CE             Moderator (Fujitsu)

Wednesday decision: Draft reply LS on number of beam measurements in the measurement report MAC CE is endorsed assuming the following editorials:

RAN1 would like to thank RAN2 for their LS on number of beam measurements in the measurement report MAC CE.

RAN1 assumes at maximum 16 beams can be reported by a single event triggered reporting regardless whether or not the report includes the current beam. It is       noted that the maximum number of beams that can be reported by a UE is subject to UE capability which is under discussion in RAN1.

Final reply LS to R2-2501485 (R1-2501686) is approved in R1-2503077.

[FL proposal 3-4-v1]

For the RS type determination for event triggered reporting with event LTM2,

-        Alt 1-1: RS type is RRC configured

o   Vivo, CATT, Fujitsu, MediaTek, CMCC, Google, OPPO, LG, Huawei, Lenovo

o   Justification: RAN2 has such agreement

-        Alt 1-2: At least one candidate RS shall be configured

o   Spreadtrum, Ericsson, Nokia, DOCOMO, Qualcomm, InterDigital, Samsung, TCL, ZTE, Xiaomi

o   Justification: RAN1 has similar agreement for UEIBM, and the network most like to configure candidate RSs even for event LTMs.

Comeback on Wednesday.

Agreement

For candidate cell CSI acquisition

• In addition to periodic CSI-RS resource, semi-persistent CSI-RS resource is supported
• Support of semi-persistent CSI-RS resource is subject to separate UE capability.
• MAC CE is used to activate/deactivate the semi-persistent CSI-RS resource similarly to the legacy mechanism for a serving cell which will be specified in RAN2

Send an LS to RAN2 and RAN3 to inform this agreement.

R1-2503078        [Draft] LS on the support of semi-persistent CSI-RS resource for LTM CSI acquisition for candidate cells      Moderator (Fujitsu)

Wednesday decision: Draft reply LS on the support of semi-persistent CSI-RS resource for LTM CSI acquisition for candidate cells is endorsed. Final LS is approved in R1-2503079.

R1-2502089        FL summary 2 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Wednesday session

Agreement

For the RS type determination for event triggered reporting with event LTM2,

·        Alt 1-2: At least one candidate RS shall be configured.

Agreement

For the container of LTM CSI report to a target cell, UCI is used with a solution to avoid blind detection at gNB if valid CSI is not available.

·        FFS: the definition of valid CSI.

R1-2502090        FL summary 3 of Measurements related enhancements for LTM     Moderator (Fujitsu)

From Thursday session

Agreement

For the solution to avoid blind detection for LTM CSI report if valid CSI is not available,

·        Option 1: CSI is reported when valid CSI is not available.

o   Option 1-1: one CQI codepoint is used to indicate that valid CSI is not available.

§  Option 1-1-1: Codepoint with the lowest CQI index is reported.

Agreement

Regarding CSI acquisition, for a candidate cell,

• A single CSI report configuration is configured
• Multiple CSI-RS resources for CMR can be associated with the CSI report configuration
• The number of CSI-RS resources for CMR is subject to UE capability

Agreement

Following restrictions are introduced:

• For the codebook configurations in report configuration, typeI-SinglePanel is supported for LTM CSI acquisition.
• For report frequency configuration in report configuration, wideband CQI and wideband PMI are supported for LTM CSI acquisition.
• For the report quantity in report configuration, cri-RI-PMI-CQI is supported for LTM CSI acquisition.
• The supported max rank is up to separate UE capability.
• For the number of CSI-RS ports of CSI-RS resource(s) associated with a CSI report configuration for a candidate cell for LTM CSI acquisition.
• Up to 128 ports is supported.
• The supported max number of CSI-RS ports is up to separate UE capability.

R1-2502091         Final FL summary of Measurements related enhancements for LTM      Moderator (Fujitsu)

Thursday session was closed with a Way Forward requesting RAN1 Chair to join the mobility dinner on Wednesday next meeting in Malta.

 RAN1#121

9.9       NR mobility enhancements Phase 4

Please refer to RP-250339 for detailed scope of the WI.

Rapporteur to provide initial input on higher layer signalling under agenda item 9.9. For input on higher layer signalling from any other source, please include it as part of your tdoc to relevant sub-agenda items.

[121-R19-Mobility] Email discussion on channel modelling for NR mobility enhancement – Yosuke (Fujitsu)

-        To be used for sharing updates on online/offline schedule, details on what is to be discussed in online/offline sessions, tdoc number of the moderator summary for online session, etc

9.9.11        Measurements related enhancements for LTM

R1-2503259            Measurements related enhancements for LTM      Huawei, HiSilicon

R1-2503376            Remaining issues on measurements related enhancements for LTM    vivo

R1-2503419            Discussion on measurements related enhancements for LTM               NEC

R1-2503422            Measurement related enhancements for LTM       Nokia

R1-2503428            Discussion on measurements related enhancements for LTM               LG Electronics

R1-2503447            Measurements related enhancements for LTM      TCL

R1-2503526            Discussion on measurements related enhancements for LTM               Spreadtrum, UNISOC

R1-2503580            Views on Rel-19 measurement related enhancements for LTM            Samsung

R1-2503672            Discussion on measurements related enhancements for LTM               ZTE Corporation, Sanechips

R1-2503713            Discussion on measurement related enhancements for LTM Lekha Wireless Solutions

R1-2503809            Remaining issues on measurements related enhancements for LTM    CATT

R1-2503843            Discussion on measurements related enhancements for LTM               CMCC

R1-2503862            FL plan for mobility enhancements in RAN1#121                Moderator (Fujitsu)

R1-2503866            Final FL summary of Measurements related enhancements for LTM  Moderator (Fujitsu)

R1-2503894            Discussion on measurements related enhancements for LTM               Xiaomi

R1-2503916            Measurements related enhancements for LTM      Lenovo

R1-2503949            Measurements related enhancements for LTM      InterDigital, Inc.

R1-2504004            Discussion on measurement related enhancements for LTM Fujitsu Limited

R1-2504148            Discussion on measurements related enhancements for LTM               ETRI

R1-2504184            Measurement related enhancements for LTM       Ericsson

R1-2504233            Discussions on measurement enhancement for LTM            OPPO

R1-2504300            Discussion on measurements related enhancements for LTM               Google

R1-2504340            Measurement related enhancements for LTM       Apple

R1-2504408            Measurements related enhancement for LTM       Qualcomm Incorporated

R1-2504450            Discussion on measurements related enhancements for LTM               KDDI Corporation

R1-2504513            Discussion on measurement related enhancements for LTM NTT DOCOMO, INC.

R1-2504546            Discussion on measurements related enhancements for LTM               Sharp

R1-2504595            LTM measurements related enhancements            MediaTek Inc.

R1-2503863            FL summary 1 of Measurements related enhancements for LTM         Moderator (Fujitsu)

Conclusion

-        From RAN1 perspective, there is no restriction with regards to the frequency location of CSI-RS used for CSI acquisition for candidate cells

Send an LS to RAN4 (CC RAN2) and ask them to take the above conclusion in their further work. LS in R1-2504828.

Agreement

A list of interference measurement resources for candidate cells is supported for LTM CSI acquisition

-        If this list is not configured, CMR is used for interference measurement

Agreement

When SpCellInclusion is configured for gNB configured reporting for L1-RSRP based on CSI-RS, the following rule is used to determine the CSI-RS for current SpCell:

-        NZP-CSI-RS resources in [ltm-CSI-NZP-CSI-RS-ResourceList] associated with the current SpCell are the entries where PCI (given by ltm-CandidatePCI) and frequency information (given by ssb-Frequency for the SSBs QCLed with NZP-CSI-RSs) of the candidate cell associated with the LTM-CandidateId (given by the corresponding entry in ltm-CandidateIdList) is equal to the PCI and center frequency of cell-defining SSB of the current SpCell.

Conclusion

RRC configuration for time restriction is NOT introduced for CSI-RS based L1-RSRP measurement for either event triggered reporting or gNB scheduled reporting, i.e. it is up to RAN4 how many samples are used to define their requirement.

R1-2503864            FL summary 2 of Measurements related enhancements for LTM         Moderator (Fujitsu)

Agreement

CSI report configuration for CSI acquisition is determined from the field of Target Configuration ID in CSC MAC CE

R1-2503865            FL summary 3 of Measurements related enhancements for LTM         Moderator (Fujitsu)

Agreement

For PUSCH to convey the early CSI report,

-        For RACH-less LTM, the first CG or DG PUSCH after CSC is used

-        For RACH-based LTM with CFRA, PUSCH scheduled by RAR or Msg.A

-        For RACH-based LTM with CBRA, the first CG or DG PUSCH after HARQ-ACK transmission for Msg.4 or Msg.B

For the reporting LTM early CSI reporting, Table 6.3.1.1.2-7 in TS 38.212 is used as a UCI report format

Conclusion

There is no RAN1 consensus in Rel-19 to provide the UE with an indication of a subset of CSI-RS resources for CSI measurement before CSC

Conclusion

There is no RAN1 consensus to introduce delay requirements based on Z and Z’

Conclusion

No CPU is defined for LTM event triggered reporting.

R1-2504889            FL summary 4 of Measurements related enhancements for LTM         Moderator (Fujitsu)

Conclusion

For the LTM CSI acquisition after CSC until the completion of LTM procedure, CPU is not defined

Conclusion

Definition of active CSI-RS resources after CSC until the completion of LTM procedure:

-        Active CSI-RS ports/resources for the candidate cells including target cell are not defined after CSC until the completion of LTM procedure

Conclusion

For the LTM CSI measurement before CSC, CPU is not defined

Conclusion

For the counting of active CSI-RS ports/resources before CSC, no new UE capability is introduced. The total number of active CSI-RS ports/resources is limited by legacy capability report. The total number of active CSI-RS ports/resources is shared by serving cell and candidate cell(s).