Offline discussion on remaining details on RRM measurements 3GPP TSG RAN WG1 Meeting #NR-AH3 　　　　　　　 R1-17ｘｘｘｘｘ Nagoya, Japan, 18th – 21th September 2017 Agenda item: 6.1.5.1 Document for decision Offline discussion on remaining details on RRM measurements NTT DOCOMO

Background Following issues would be remaining essential aspects for NR RRM measurements For SS block based RRM measurement: RSSI definition for SS-RSRQ Interference measurement definition for SS-SINR SMTC configuration details Measurement on multiple SS blocks within wideband CC For CSI-RS based RRM measurement: RSSI definition for CSI-RSRQ Interference measurement definition for CSI-SINR Remaining details on CSI-RS properties Remaining details on configuration for CSI-RS based measurement Others Details on MG for the case where UE performs measurement outside its active BWP Necessity of MG for the case where UE performs measurement with RX beam sweeping

RSSI definition for SS-RSRQ Measurement resource (time domain) Option 1: RSSI is measured on explicitly configured resource Option 2: RSSI is measured on all OFDM symbols within a DL part of slot containing corresponding SS block Option 3: RSSI is measured on OFDM symbols within a DL part of slot containing corresponding SS block except for symbols containing SS block(s) Option 4: RSSI is measured on OFDM symbols within DL part of a set of slots within SMTC window duration except for symbols containing SS block(s) The set of slots can be all DL slots within SMTC window by default, and can be configured by higher layer signaling Other options? Measurement bandwidth Option 1: RSSI is measured within configured bandwidth Option 2: RSSI is measured within SSB bandwidth Other proposals: From RAN1 perspective, SS-RSRQ is defined as RSRQ measurement based on a SS block Whether and how cell level RSRQ is performed is up to RAN2 For a SS-RSRQ measurement, the same RX beam shall be applied between RSSI measurement and RSRP measurement SS block based RSSI measurement resource(s) is confined within SMTC window duration

Interference measurement definition for SS-SINR Measurement resource (time domain) Option 1: Interference is measured on configured resource Option 2: Interference is measured on OFDM symbols containing corresponding SS block Other options? Measurement resource (frequency domain) Option 2: Interference is measured on REs carrying corresponding SSS (and PBCH-DMRS) Measurement bandwidth Option 1: Interference is measured within configured bandwidth Option 2: Interference is measured within SSB bandwidth Other proposals: From RAN1 perspective, SS-SINR is defined as SINR measurement based on a SS block Whether and how cell level SINR is performed is up to RAN2 For a SS-SINR measurement, the same RX beam shall be applied between interference measurement and RSRP measurement SS block based interference measurement resource(s) is confined within SMTC window duration

SMTC configuration details Candidate value(s) for SMTC window duration 1, [2, 3, 4,] 5 ms are supported UE is not required to perform measurement on SS block outside SMTC window Candidate values for SMTC window offset 0, [1, 2, 3,] 4 ms are supported Whether SMTC for IDLE mode measurement and one of two SMTCs for the intra-frequency CONNECTED mode measurement are common or separate Whether SMTC for inter-frequency CONNECTED mode measurement is per carrier or per UE SSB composition for RRM measurement purpose

Measurement on multiple SS blocks in wideband CC Whether and how to support UE measurement on multiple SS blocks within wideband CC? Option 1: Not support (i.e., measurement on each frequency location is separately configured) Option 2: Support by single measurement object (i.e., support to indicate multiple SS block location offsets in a measurement object) 2-1: Multiple SS blocks on different frequency locations are used for averaging RSRP 2-2: Multiple SS blocks on different frequency locations are used for measuring different beams simultaneously 2-3: Multiple SS block frequency locations are used for separate estimation of RSSI/interference QCL relationship between multiple SS blocks on different frequency locations with the same SS block index Option 1: Configurable (NW indicates QCL relationship) Option 2: Assumed to be QCLed Option 3: Assumed to be NOT QCLed Other options? How many SMTCs can be configured for the measurement on multiple SS blocks in wideband CC? Option 1: SMTC is per SS block frequency location Option 2: SMTC can be common to multiple SS block frequency locations Option 3: SMTC is per CC

RSSI definition for CSI-RSRQ Measurement resource (time domain) Option 1: RSSI is measured on configured resource Option 2: RSSI is measured on OFDM symbols containing corresponding CSI-RS port Option 3: RSSI is measured on OFDM symbols containing all configured CSI-RS resources Other options? Measurement resource (frequency domain) Proposal: RSSI is measured on all REs within a measurement bandwidth Other option? Measurement bandwidth Option 1: RSSI is measured within CSI-RS measurement bandwidth Option 2: RSSI is measured within separately configured bandwidth Other proposals: From RAN1 perspective, CSI-RSRQ is defined as RSRQ measurement based on a CSI-RS port Whether and how cell level RSRQ is performed is up to RAN2 For a CSI-RSRQ measurement, the same RX beam shall be applied between RSSI measurement and RSRP measurement

Interference measurement definition for CSI-SINR Measurement resource (time domain) Option 1: Interference is measured on configured resource Option 2: Interference is measured on OFDM symbols containing corresponding CSI-RS port Other options? Measurement resource (frequency domain) Option 1: Interference is measured on all REs within a measurement bandwidth Option 2: Interference is measured on REs carrying corresponding CSI-RS port Other option? Measurement bandwidth Option 1: Interference is measured within CSI-RS measurement bandwidth Option 2: Interference is measured within separately configured bandwidth Other proposals: From RAN1 perspective, CSI-SINR is defined as SINR measurement based on a CSI-RS port Whether and how cell level SINR is performed is up to RAN2 For a CSI-SINR measurement, the same RX beam shall be applied between interference measurement and RSRP measurement

Remaining details on CSI-RS properties (1) Number of CSI-RS ports used for CSI-RS based measurement Option 1: 1 Option 2: Configure either 1 or 2 Option 3: Configure either 1, 2 or 4 Other options? FFS: combining between CSI-RS ports to derive a CSI-RSRP Maximum number of CSI-RS resources Option 1: 1000 Option 2: 96 Maximum number of slots that covers all configured CSI-RS resources Option 2: 5 Other proposals: All configured CSI-RS resources of different cells need to be confined within a certain time duration Option 1: It should be confined within X slots (i.e., same with per cell restriction) Option 2: It should be confined within Y slots (Y >= X)

Remaining details on CSI-RS properties (2) Whether 80 ms and/or 160 ms periodicity for CSI-RS based measurement is supported or not Candidate value(s) of measurement bandwidth other than minimum carrier bandwidth for each frequency band/range Option 1: UE maximum bandwidth Option 2: Bandwidth of active bandwidth part Other options? Candidate value(s) of transmission bandwidth of CSI-RS Option 1: Channel bandwidth values supported for each frequency band/range Other property?

Remaining details on configuration for CSI-RS based measurement Measurement timing configuration Option 1: Single measurement timing configuration per carrier for both intra- and inter-frequency measurement Other options? Common configuration for all configured CSI-RS resources/ports Measurement timing configuration (i.e., measurement window duration, periodicity and timing offset) Measurement bandwidth Configuration on number of antenna ports (if configurability is supported) Numerology Other properties that should be common to all configured CSI-RS? Common configuration for a group of configured CSI-RS resources/ports Any properties that should be group-common?

Details on MG for the case where UE performs measurement outside its active BWP Agreements: When a UE performs measurement or transmit SRS outside of its active BWP, it is considered as a measurement gap FFS: details of measurement gap configuration During the measurement gap, UE is not expected to monitor CORESET [Proposal]

Necessity of MG for the case where UE performs measurement with RX beam sweeping [Proposal]

Proposals For a SS-RSRQ measurement, the same RX beam shall be applied between RSSI measurement and RSRP measurement For a CSI-RSRQ measurement, the same RX beam shall be applied between RSSI measurement and RSRP measurement It is up to UE implementation how to select a set of RX beams to perform RRM measurement on a carrier Different sets of RX beams can be used in measurements based on different measurement objects Same set of RX beams shall be used in measurement of each TX beam based on a measurement object FFS Alt.1: Measurement to be reported shall be greater than average of measurements based on each RX beam in the selected set Alt.2: Measurement to be reported shall be the best among measurements based on each RX beam in the selected set Alt.1 may be too pessimistic and Alt.2 may be too optimistic. RAN1 would need to find better i.e., intermediate solution.

Proposals SS block based RSSI measurement resource(s) is confined within SMTC window duration SS block based interference measurement resource(s) is confined within SMTC window duration