1. 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:
Document for decision
Offline discussion on remaining details on RRM measurements
NTT DOCOMO

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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)

10. 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?

11. 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?

12. 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]

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

14. 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.

15. 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