Content for TS 38.331 Word version: 17.4.0

1… 4… 5… 5.2.2.4… 5.3… 5.3.3… 5.3.5… 5.3.5.5… 5.3.5.6… 5.3.5.7… 5.3.5.13… 5.3.6… 5.3.8… 5.3.13… 5.3.14… 5.4… 5.5… 5.5.3… 5.5.4… 5.5.5… 5.5a… 5.7… 5.7.4… 5.7.8… 5.8… 5.8.9… 5.8.10… 5.8.11… 5.9… 6… 6.2.2… 6-2-2-25… 6.3… 6.3.2… 6-3-2-27… 6-3-2-49… 6-3-2-73… 6-3-2-95… 6-3-2-108… 6-3-2-134… 6-3-2-162… 6-3-2-188… 6-3-2-213… 6-3-2-243… 6-3-2-271… 6-3-2-297… 6.3.3… 6-3-3-25… 6-3-3-51… 6.3.4… 6.3.5… 6-3-5-25… 6.3.6… 6.4… 7… 9… 11… A… A.4… B…

5.8.11 Zone identity calculation 5.8.12 DFN derivation from GNSS 5.8.13 NR sidelink discovery 5.8.14 NR sidelink U2N Relay UE operation 5.8.15 NR sidelink U2N Remote UE operation
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5.8.11 Zone identity calculation p. 326

The UE shall determine an identity of the zone (i.e. Zone_id) in which it is located using the following formulae, if sl-ZoneConfig is configured:

x1= Floor (x / L) Mod 64;

y1= Floor (y / L) Mod 64;

Zone_id = y1 * 64 + x1.

The parameters in the formulae are defined as follows:

is the value of sl-ZoneLength included in sl-ZoneConfig;

is the geodesic distance in longitude between UE's current location and geographical coordinates (0, 0) according to WGS84 model [58] and it is expressed in meters;

is the geodesic distance in latitude between UE's current location and geographical coordinates (0, 0) according to WGS84 model [58] and it is expressed in meters.

5.8.12 DFN derivation from GNSS p. 327

When the UE selects GNSS as the synchronization reference source, the DFN, the subframe number within a frame and slot number within a frame used for NR sidelink communication/discovery are derived from the current UTC time, by the following formulae:

DFN= Floor (0.1*(Tcurrent -Tref-OffsetDFN)) mod 1024

SubframeNumber= Floor (Tcurrent -Tref-OffsetDFN) mod 10

SlotNumber= Floor ((Tcurrent -Tref-OffsetDFN)*2μ) mod (10*2μ)

Where:

Tcurrent

is the current UTC time obtained from GNSS. This value is expressed in milliseconds;

Tref

is the reference UTC time 00:00:00 on Gregorian calendar date 1 January, 1900 (midnight between Thursday, December 31, 1899 and Friday, January 1, 1900). This value is expressed in milliseconds;

OffsetDFN

is the value sl-OffsetDFN if configured, otherwise it is zero. This value is expressed in milliseconds.

μ=0/1/2/3

corresponding to the 15/30/60/120 kHz of SCS for SL, respectively.

5.8.13 NR sidelink discovery |R17| p. 327

5.8.13.1 General p. 327

The purpose of this procedure is to perform NR sidelink discovery as specified in TS 23.304.

5.8.13.2 NR sidelink discovery monitoring p. 327

A UE capable of NR sidelink discovery that is configured by upper layers to monitor NR sidelink discovery messages shall:

1 >

if the frequency used for NR sidelink discovery is included in sl-FreqInfoToAddModList in RRCReconfiguration message and sl-DiscConfig is included in RRCReconfiguration; or if the frequency used for NR sidelink discovery is included in sl-FreqInfoList included in SIB12 and sl-DiscConfigCommon is included in SIB12:

2 >

if the UE is configured with sl-DiscRxPool for NR sidelink discovery reception included in RRCReconfiguration message with reconfigurationWithSync (i.e. handover):

3 >

configure lower layers to monitor sidelink control information and the corresponding data using the resource pool indicated by sl-DiscRxPool for NR sidelink discovery reception in RRCReconfiguration;

2 >

else if the UE is configured with sl-RxPool for NR sidelink discovery reception included in RRCReconfiguration message with reconfigurationWithSync (i.e. handover):

3 >

configure lower layers to monitor sidelink control information and the corresponding data using the resource pool indicated by sl-RxPool for NR sidelink discovery reception in RRCReconfiguration;

2 >

else if the cell chosen for NR sidelink discovery reception provides SIB12:

3 >

if sl-DiscRxPool for NR sidelink is included in SIB12:

4 >

configure lower layers to monitor sidelink control information and the corresponding data using the resource pool indicated by sl-DiscRxPool for NR sidelink discovery reception in SIB12;

3 >

else if sl-RxPool for NR sidelink is included in SIB12:

4 >

configure lower layers to monitor sidelink control information and the corresponding data using the resource pool indicated by sl-RxPool for NR sidelink discovery reception in SIB12;

1 >

else:

2 >

if out of coverage on the concerned frequency for NR sidelink discovery:

3 >

if sl-DiscRxPool was preconfigured:

4 >

configure lower layers to monitor sidelink control information and the corresponding data using the resource pool that was preconfigured by sl-DiscRxPool for NR sidelink discovery reception in SL-PreconfigurationNR, as defined in clause 9.3;

3 >

else:

4 >

configure lower layers to monitor sidelink control information and the corresponding data using the resource pool that was preconfigured by sl-RxPool for NR sidelink discovery reception in SL-PreconfigurationNR, as defined in clause 9.3;

5.8.13.3 NR sidelink discovery transmission p. 328

A UE capable of NR sidelink discovery that is configured by upper layer to transmit NR sidelink discovery message shall:

1 >

if the frequency used for NR sidelink discovery is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message; or if the frequency used for NR sidelink discovery is included in sl-FreqInfoList within SIB12:

2 >

if the UE is in RRC_CONNECTED and uses the frequency included in sl-ConfigDedicatedNR within RRCReconfiguration message:

3 >

if the UE is acting as NR sidelink U2N Relay UE and sl-DiscConfig is included in RRCReconfiguration, and if the NR sidelink U2N Relay UE threshold conditions as specified in clause 5.8.14.2 are met based on sl-RelayUE-Config; or

3 >

if the UE is selecting NR sidelink U2N Relay UE / has a selected NR sidelink U2N Relay UE/ configured with measurement object associated to L2 U2N Relay UEs and sl-DiscConfig is included in RRCReconfiguration, and if the NR sidelink U2N Remote UE threshold conditions as specified in clause 5.8.15.2 are met based on sl-RemoteUE-Config; or

3 >

if the UE is performing NR sidelink non-relay discovery:

4 >

if the UE is configured with sl-ScheduledConfig:

5 >

if T310 for MCG or T311 is running; and if sl-TxPoolExceptional is included in sl-FreqInfoList for the concerned frequency in SIB12 or included in sl-ConfigDedicatedNR in RRCReconfiguration; or

5 >

if T301 is running and the cell on which the UE initiated RRC connection re-establishment provides SIB12 including sl-TxPoolExceptional for the concerned frequency; or

5 >

if T304 for MCG is running and the UE is configured with sl-TxPoolExceptional included in sl-ConfigDedicatedNR for the concerned frequency in RRCReconfiguration:

6 >

configure lower layers to perform the sidelink resource allocation mode 2 based on random selection using the resource pool indicated by sl-TxPoolExceptional as defined in TS 38.321;

5 >

else:

6 >

configure lower layers to perform the sidelink resource allocation mode 1 using the resource pool indicated by sl-DiscTxPoolScheduling or sl-TxPoolScheduling for NR sidelink discovery transmission on the concerned frequency in RRCReconfiguration;

5 >

if T311 is running, configure the lower layers to release the resources indicated by rrc-ConfiguredSidelinkGrant (if any);

4 >

if the UE is configured with sl-UE-SelectedConfig:

5 >

if the sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency is included in the sl-ConfigDedicatedNR within RRCReconfiguration, and if a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency included in sl-ConfigDedicatedNR within RRCReconfiguration is not available in accordance with TS 38.214; or

5 >

if the sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency is not included in the sl-ConfigDedicatedNR within RRCReconfiguration, and a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency included in sl-ConfigDedicatedNR within RRCReconfiguration is not available in accordance with TS 38.214;

6 >

if sl-TxPoolExceptional for the concerned frequency is included in RRCReconfiguration; or

6 >

if the PCell provides SIB12 including sl-TxPoolExceptional in sl-FreqInfoList for the concerned frequency:

7 >

configure lower layers to perform the sidelink resource allocation mode 2 based on random selection using the resource pool indicated by sl-TxPoolExceptional as defined in TS 38.321;

5 >

else, if the sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency is included in the sl-ConfigDedicatedNR within RRCReconfiguration:

6 >

configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency in RRCReconfiguration;

5 >

else, if the sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency is included in the sl-ConfigDedicatedNR within RRCReconfiguration:

6 >

configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency in RRCReconfiguration;

2 >

else if the cell chosen for NR sidelink discovery transmission provides SIB12:

3 >

if the UE is acting as NR sidelink U2N Relay UE and sl-DiscConfigCommon is included in SIB12, and if the NR sidelink U2N Relay UE threshold conditions as specified in clause 5.8.14.2 are met based on sl-RelayUE-ConfigCommon in SIB12; or

3 >

if the UE is selecting NR sidelink U2N Relay UE / has a selected NR sidelink U2N Relay UE and sl-DiscConfigCommon is included in SIB12, and if the NR sidelink U2N Remote UE threshold conditions as specified in clause 5.8.15.2 are met based on sl-RemoteUE-ConfigCommon in SIB12; or

3 >

if the UE is performing NR sidelink non-relay discovery:

4 >

if SIB12 includes sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency, and a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in the sl-DiscTxPoolSelected for NR sidelink discovery transmission is available in accordance with TS 38.214 or random selection, if allowed by sl-AllowedResourceSelectionConfig, is selected:

5 >

configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig using the pools of resources indicated by sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency in SIB12 as defined in TS 38.321;

4 >

else if SIB12 includes sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency, and a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in the sl-TxPoolSelectedNormal for NR sidelink discovery transmission is available in accordance with TS 38.214 or random selection, if allowed by sl-AllowedResourceSelectionConfig, is selected:

5 >

configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig using the pools of resources indicated by sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency in SIB12 as defined in TS 38.321;

4 >

else if SIB12 includes sl-TxPoolExceptional for the concerned frequency:

5 >

from the moment the UE initiates RRC connection establishment or RRC connection resume, until receiving an RRCReconfiguration including sl-ConfigDedicatedNR, or receiving an RRCRelease or an RRCReject; or

5 >

if a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency in SIB12 is not available in accordance with TS 38.214; or

5 >

if sl-DiscTxPoolSelected for NR sidelink discovery transmission on the concerned frequency is not included in SIB12 and if a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency in SIB12 is not available in accordance with TS 38.214:

6 >

configure lower layers to perform the sidelink resource allocation mode 2 based on random selection (as defined in TS 38.321) using one of the pools of resources indicated by sl-TxPoolExceptional for the concerned frequency;

1 >

else if out of coverage on the concerned frequency for NR sidelink discovery:

2 >

if the UE is acting as L3 U2N Relay UE; or

2 >

if the UE is selecting NR sidelink U2N Relay UE / has a selected NR sidelink U2N Relay UE and if the NR sidelink U2N Remote UE threshold conditions as specified in clause 5.8.15.2 are met based on sl-RemoteUE-ConfigCommon in SidelinkPreconfigNR; or

2 >

if the UE is performing NR sidelink non-relay discovery:

3 >

configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.213) using the pools of resources indicated in sl-DiscTxPoolSelected or sl-TxPoolSelectedNormal for NR sidelink discovery transmission on the concerned frequency in SidelinkPreconfigNR.

5.8.14 NR sidelink U2N Relay UE operation |R17| p. 331

5.8.14.1 General p. 331

This procedure is used by a UE supporting NR sidelink U2N Relay UE operation configured by upper layers to transmit NR sidelink discovery messages to evaluate AS layer conditions.

5.8.14.2 NR sidelink U2N Relay UE threshold conditions p. 331

A UE capable of NR sidelink U2N Relay UE operation shall:

1 >

if the threshold conditions specified in this clause were previously not met:

2 >

if threshHighRelay is not configured; or the RSRP measurement of the PCell, or the cell on which the UE camps, is below threshHighRelay by hystMaxRelay if configured; and

2 >

if threshLowRelay is not configured; or the RSRP measurement of the PCell, or the cell on which the UE camps, is above threshLowRelay by hystMinRelay if configured:

3 >

consider the threshold conditions to be met (entry);

1 >

else:

2 >

if the RSRP measurement of the PCell, or the cell on which the UE camps, is above threshHighRelay if configured; or

2 >

if the RSRP measurement of the PCell, or the cell on which the UE camps, is below threshLowRelay if configured;

3 >

consider the threshold conditions not to be met (leave);

5.8.15 NR sidelink U2N Remote UE operation |R17| p. 331

5.8.15.1 General p. 331

This procedure is used by a UE supporting NR sidelink U2N Remote UE operation configured by upper layers to transmit NR sidelink discovery message to evaluate AS layer conditions. The procedure is also used to perform selection and reselection of NR sidelink U2N Relay UE.

5.8.15.2 NR Sidelink U2N Remote UE threshold conditions p. 331

A UE capable of NR sidelink U2N Remote UE operation shall:

1 >

if the threshold conditions specified in this clause were previously not met:

2 >

if threshHighRemote is not configured; or the RSRP measurement of the PCell, or the cell on which the UE camps, is below threshHighRemote by hystMaxRemote if configured, or

2 >

if the UE has no serving cell:

3 >

consider the threshold conditions to be met (entry);

1 >

else:

2 >

if the RSRP measurement of the PCell, or the cell on which the UE camps, is above threshHighRemote if configured:

3 >

consider the threshold conditions not to be met (leave);

The L2 U2N Remote UE considers the cell indicated by sl-ServingCellInfo in the SL-AccessInfo-L2U2N-r17 received from the connected L2 U2N Relay UE as the camping cell.

5.8.15.3 Selection and reselection of NR sidelink U2N Relay UE p. 332

A UE capable of NR sidelink U2N Remote UE operation that is configured by upper layers to search for a NR sidelink U2N Relay UE shall:

1 >

if the UE has no serving cell; or

1 >

if the RSRP measurement of the cell on which the UE camps (for L2 and L3 U2N Remote UE in RRC_IDLE or RRC_INACTIVE)/ the PCell (for L3 U2N Remote UE in RRC_CONNECTED) is below threshHighRemote within sl-RemoteUE-Config:

2 >

if the UE does not have a selected NR sidelink U2N Relay UE; or

2 >

if the UE has a selected NR sidelink U2N Relay UE, and SL-RSRP of the currently selected NR sidelink U2N Relay UE is available and is below sl-RSRP-Thresh; or

2 >

if the UE has a selected NR sidelink U2N Relay UE, and SL-RSRP of the currently selected NR sidelink U2N Relay UE is not available, and SD-RSRP of the currently selected U2N Relay UE is below sl-RSRP-Thresh; or

2 >

if the UE has a selected NR sidelink U2N Relay UE, and upper layers indicate not to use the currently selected NR sidelink U2N Relay UE; or

2 >

if the UE has a selected NR sidelink U2N Relay UE, and upper layers request the release of the PC5-RRC connection; or

2 >

if the UE has a selected NR sidelink U2N Relay UE, and sidelink radio link failure is detected on the PC5-RRC connection with the current U2N Relay UE as specified in clause 5.8.9.3:

3 >

perform NR sidelink discovery procedure as specified in clause 5.8.13 in order to search for candidate NR sidelink U2N Relay UEs;

4 >

when evaluating the one or more detected NR sidelink U2N Relay UEs, apply layer 3 filtering as specified in 5.5.3.2 across measurements that concern the same U2N Relay UE ID and using the sl-FilterCoefficientRSRP in SIB12 (if in RRC_IDLE/INACTIVE), the sl-FilterCoefficientRSRP in sl-ConfigDedicatedNR (if in RRC_CONNECTED) or the preconfigured sl-FilterCoefficientRSRP as defined in 9.3 (out of coverage), before using the SD-RSRP measurement results;

4 >

consider a candidate NR sidelink U2N Relay UE for which SD-RSRP exceeds sl-RSRP-Thresh by sl-HystMin has met the AS criteria;

3 >

if the UE detects any suitable NR sidelink U2N Relay UE(s):

4 >

consider one of the available suitable NR sidelink U2N relay UE(s) can be selected;

3 >

else:

4 >

consider no NR sidelink U2N Relay UE to be selected.