Content for TS 38.331 Word version: 18.0.0

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… 5.3.5.17… 5.3.6… 5.3.8… 5.3.13… 5.3.14… 5.4… 5.5… 5.5.3… 5.5.4… 5.5.4.15… 5.5.4.23… 5.5.5… 5.5a… 5.7… 5.7.4… 5.7.8… 5.7.12… 5.8… 5.8.9… 5.8.9.2… 5.8.9.8… 5.8.10… 5.8.11… 5.9… 5.10… 6… 6.2.2… 6-2-2-23… 6-2-2-27… 6-2-2-43… 6-2-2-47… 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… 6-3-2-341… 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 5.8.13.1 General 5.8.13.2 NR sidelink discovery monitoring 5.8.13.3 NR sidelink discovery transmission 5.8.14 NR sidelink U2N Relay UE operation 5.8.14.1 General 5.8.14.2 NR sidelink U2N Relay UE threshold conditions 5.8.15 NR sidelink U2N Remote UE operation 5.8.15.1 General 5.8.15.2 NR Sidelink U2N Remote UE threshold conditions 5.8.15.3 Selection and reselection of NR sidelink U2N Relay UE 5.8.16 NR sidelink U2U Relay UE operation 5.8.16.1 General 5.8.16.2 NR sidelink U2U Relay UE threshold conditions 5.8.16.3 Neighbor UE(s) in proximity conditions 5.8.17 NR sidelink U2U Remote UE operation 5.8.17.1 General 5.8.17.2 NR Sidelink U2U Remote UE threshold conditions 5.8.17.3 Conditions for Selection and reselection of NR sidelink U2U Relay UE 5.8.17.4 Actions related to selection and reselection of NR sidelink U2U Relay UE 5.8.18 NR sidelink positioning 5.8.18.1 General 5.8.18.2 NR sidelink positioning reception 5.8.18.3 NR sidelink positioning transmission
...

5.8.11 Zone identity calculation p. 415

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. 415

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 p. 416

5.8.13.1 General p. 416

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. 416

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 discovery reception 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 discovery reception 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. 416

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 selecting NR sidelink U2U Relay UE / has a selected NR sidelink U2U Relay UE and sl-DiscConfig is included in RRCReconfiguration, and if the NR sidelink U2U Remote UE threshold conditions associated with the peer NR Sidelink U2U Remote UE as specified in clause 5.8.17.2 are met based on sl-RemoteUE-ConfigU2U; or

3 >

if the UE acting as Target Remote UE is performing U2U Relay Discovery with Model B and sl-DiscConfig is included in RRCReconfiguration, and if the NR sidelink U2U Remote UE threshold conditions associated with the NR sidelink U2U Relay UE as specified in clause 5.8.17.2 are met based on sl-RemoteUE-ConfigU2U; or

3 >

if the UE acting as U2U Relay UE is performing U2U Relay Discovery with Model A or Model B response message as specified in TS 23.304; or

3 >

if the UE acting as U2U Relay UE is performing U2U Relay Discovery with Model B as specified in TS 23.304 and sl-DiscConfig is included in RRCReconfiguration, and if the NR sidelink U2U Relay UE threshold conditions as specified in clause 5.8.16.2 are met based on sl-RelayUE-ConfigU2U; 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 for NR sidelink discovery transmission;

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 >

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 selecting NR sidelink U2U Relay UE / has a selected NR sidelink U2U Relay UE and sl-DiscConfigCommon is included in SIB12, and if the NR sidelink U2U Remote UE threshold conditions associated with the peer NR Sidelink U2U Remote UE as specified in clause 5.8.17.2 are met based on sl-RemoteUE-ConfigCommonU2U in SIB12; or

3 >

if the UE acting as Target Remote UE is performing U2U Relay Discovery with Model B and if the NR sidelink U2U Remote UE threshold conditions associated with the NR sidelink U2U Relay UE as specified in clause 5.8.17.2 are met based on sl-RemoteUE-ConfigCommonU2U in SIB12; or

3 >

if the UE acting as U2U Relay UE is performing U2U Relay Discovery with Model A or Model B response message as specified in TS 23.304; or

3 >

if the UE acting as U2U Relay UE is performing U2U Relay Discovery with Model B as specified in TS 23.304 and if the NR sidelink U2U Relay UE threshold conditions as specified in clause 5.8.16.2 are met based on sl-RelayUE-ConfigCommonU2U 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 NR sidelink discovery transmission on 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-PreconfigDiscConfig in SidelinkPreconfigNR; or

2 >

if the UE is selecting NR sidelink U2U Relay UE / has a selected NR sidelink U2U Relay UE and if the NR sidelink U2U Remote UE threshold conditions associated with the peer NR sidelink U2U Remote UE as specified in clause 5.8.17.2 are met based on sl-RemoteUE-PreconfigU2U in SidelinkPreconfigNR; or

2 >

if the UE acting as U2U Relay UE is performing U2U Relay Discovery with Model A or Model B response message as specified in TS 23.304; 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 p. 420

5.8.14.1 General p. 420

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. 420

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 p. 420

5.8.15.1 General p. 420

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. 420

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 not configured with MP considers the cell indicated by sl-ServingCellInfo in the SL-AccessInfo-L2U2N-r17 received from the connected L2 U2N Relay UE as the PCell/camping cell.

5.8.15.3 Selection and reselection of NR sidelink U2N Relay UE p. 421

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 clause 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 clause 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.

5.8.16 NR sidelink U2U Relay UE operation p. 422

5.8.16.1 General p. 422

This procedure is used by a UE supporting NR sidelink U2U Relay UE operation configured by upper layers to forward NR sidelink integrated discovery messages or Model B Discovery messages to evaluate AS layer conditions. The procedure is also used to determine whether a NR sidelink UE is in proximity to NR sidelink U2U Relay UE in Model A Discovery messages.

5.8.16.2 NR sidelink U2U Relay UE threshold conditions p. 422

A UE capable of NR sidelink U2U Relay UE operation shall:

1 >

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

2 >

if the sd-RSRP-Thresh-DiscConfig is not configured, or if the SL-RSRP of the Direct Communication Request message with integrated Discovery received from the Source NR sidelink U2U Remote UE is available and is above sd-RSRP-Thresh-DiscConfig if configured:

3 >

consider the threshold conditions to be met (entry);

1 >

else:

2 >

if the SL-RSRP of the Direct Communication Request message with integrated Discovery received from the Source NR sidelink U2U Remote UE is available and is below sd-RSRP-Thresh-DiscConfig by sd-hystMaxRelay if configured:

3 >

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

1 >

if the threshold conditions for Model B Discovery specified in this clause were previously not met:

2 >

if the sd-RSRP-Thresh-DiscConfig is not configured, or if the SD-RSRP of the Model B Discovery message received from the Source NR sidelink U2U Remote UE is available and is above sd-RSRP-Thresh-DiscConfig if configured:

3 >

consider the threshold conditions to be met (entry);

1 >

else:

2 >

if the SD-RSRP of the Model B Discovery message received from the Source NR sidelink U2U Remote UE is available and is below sd-RSRP-Thresh-DiscConfig by sd-hystMaxRelay if configured:

3 >

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

5.8.16.3 Neighbor UE(s) in proximity conditions p. 422

A UE capable of NR sidelink U2U Relay UE operation and is performing U2U Relay Discovery with Model A as specified in TS 23.304 shall:

1 >

for each of potential neighbor UE(s):

2 >

if the SL-RSRP of the UE is available and is above sl-RSRP-Thresh-DiscConfig if configured; or

2 >

if the SD-RSRP of the UE is available and is above sd-RSRP-Thresh-DiscConfig if configured:

3 >

consider the UE as neighbor UE in discovery message to be transmitted as defined in TS 23.304.

5.8.17 NR sidelink U2U Remote UE operation p. 423

5.8.17.1 General p. 423

This procedure is used by a UE supporting NR sidelink U2U Remote UE operation configured by upper layers to transmit NR sidelink discovery messages to evaluate AS layer conditions. The procedure is also used to perform selection and reselection of NR sidelink U2U Relay UE.

5.8.17.2 NR Sidelink U2U Remote UE threshold conditions p. 423

A UE capable of NR sidelink U2U Remote UE operation shall:

1 >

if the threshold conditions for direct PC5 link specified in this clause were previously not met:

2 >

if sl-RSRP-ThreshU2U is not configured, or if the SL-RSRP measurement of the peer NR sidelink U2U Remote UE is available and is below sl-RSRP-ThreshU2U by sl-HystMinU2U if configured; or

2 >

if sd-RSRP-ThreshU2U is not configured, or if the SD-RSRP measurement of the peer NR sidelink U2U Remote UE is available and is below sd-RSRP-ThreshU2U by sd-HystMinU2U if configured:

3 >

consider the threshold conditions to be met (entry);

1 >

else:

2 >

if the SL-RSRP measurement of the peer NR sidelink U2U Remote UE is available and is above sl-RSRP-ThreshU2U if configured; or

2 >

if the SD-RSRP measurement of the peer NR sidelink U2U Remote UE is available and is above sd-RSRP-ThreshU2U if configured:

3 >

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

1 >

if the threshold conditions for U2U relay discovery with Model B specified in this clause were previously not met:

2 >

if the sd-RSRP-ThreshU2U is not configured, or if the SD-RSRP of the NR sidelink U2U Relay UE is available and is above sd-RSRP-ThreshU2U if configured:

3 >

consider the threshold conditions to be met (entry);

1 >

else:

2 >

if the SD-RSRP of the NR sidelink U2U Relay UE is available and is below sl-RSRP-ThreshU2U by sd-HystMinU2U if configured:

3 >

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

5.8.17.3 Conditions for Selection and reselection of NR sidelink U2U Relay UE p. 423

A UE capable of NR sidelink U2U Remote UE operation shall initiate NR sidelink U2U Relay (re)selection procedure as specified in clause 5.8.17.4 when one of the following conditions is met:

1 >

if configured by upper layers to search for or select a NR sidelink U2U Relay UE; or

1 >

if the NR sidelink U2U Remote UE threshold conditions for direct PC5 link with the peer NR sidelink U2U Remote UE as specified in clause 5.8.17.2 are met within sl-RemoteUE-ConfigU2U if configured:

2 >

if the UE does not have a selected NR sidelink U2U Relay UE; or

2 >

if the UE has a selected NR sidelink U2U Relay UE, and SL-RSRP of the currently selected NR sidelink U2U Relay UE is available and is below sl-RSRP-ThreshU2U by sl-HystMinU2U within sl-RemoteUE-ConfigU2U if configured; or

2 >

if the UE has a selected NR sidelink U2U Relay UE, and SD-RSRP of the currently selected NR sidelink U2U Relay UE is available, and is below sd-RSRP-ThreshU2U by sd-HystMinU2U within sl-RemoteUE-ConfigU2U if configured; or

2 >

if the UE has a selected NR sidelink U2U Relay UE, and upper layers indicate not to use the currently selected NR sidelink U2U Relay UE; or

2 >

if the UE has a selected NR sidelink U2U Relay UE, and upper layers request the release of the PC5-RRC connection with the current NR sidelink U2U Relay UE; or

2 >

if the UE has a selected NR sidelink U2U Relay UE, and sidelink radio link failure is detected on the PC5-RRC connection with the current NR sidelink U2U Relay UE as specified in clause 5.8.9.3:

5.8.17.4 Actions related to selection and reselection of NR sidelink U2U Relay UE p. 424

A UE capable of NR sidelink U2U Remote UE operation shall:

1 >

perform NR sidelink discovery procedure as specified in clause 5.8.13 in order to search for candidate NR sidelink U2U Relay UEs;

2 >

when evaluating the one or more detected NR sidelink U2U Relay UEs, apply layer 3 filtering as specified in clause 5.5.3.2 across measurements that concern the same U2U Relay UE ID and using the sd-FilterCoefficientU2U in SIB12 (if in RRC_IDLE/INACTIVE), the sd-FilterCoefficientU2U in sl-ConfigDedicatedNR (if in RRC_CONNECTED) or the preconfigured sd-FilterCoefficientU2U as defined in clause 9.3 (out of coverage), before using the SD-RSRP measurement results;

2 >

consider a candidate NR sidelink U2U Relay UE for which SD-RSRP exceeds sd-RSRP-ThreshU2U has met the AS criteria;

1 >

if the UE detects any suitable NR sidelink U2U Relay UE(s):

2 >

consider one of the available suitable NR sidelink U2U Relay UE(s) can be selected;

1 >

else:

2 >

consider no NR sidelink U2U Relay UE to be selected;

1 >

if the UE is performing U2U Relay Communication with integrated Discovery as specified in TS 23.304 and has received Direct Communication Request message(s) from one or multiple NR sidelink U2U Relay UEs:

2 >

when evaluating the NR sidelink U2U Relay UE(s), apply layer 3 filtering as specified in clause 5.5.3.2 across measurements that concern the same U2U Relay UE ID and using the sd-FilterCoefficientU2U in SIB12 (if in RRC_IDLE/INACTIVE), the sd-FilterCoefficientU2U in sl-ConfigDedicatedNR (if in RRC_CONNECTED) or the preconfigured sd-FilterCoefficientU2U as defined in clause 9.3 (out of coverage), before using the SD-RSRP measurement results;

2 >

consider a candidate NR sidelink U2U Relay UE for which SL-RSRP exceeds sd-RSRP-ThreshU2U has met the AS criteria;

2 >

if the UE detects any suitable NR sidelink U2U Relay UE(s):

3 >

consider one of the available suitable NR sidelink U2U Relay UE(s) can be selected;

2 >

else:

3 >

consider no NR sidelink U2U Relay UE to be selected.

5.8.18 NR sidelink positioning p. 425

5.8.18.1 General p. 425

The purpose of this procedure is to perform NR sidelink positioning as specified in TS 38.305.

5.8.18.2 NR sidelink positioning reception p. 425

A UE capable of NR sidelink positioning that is configured by upper layers for reception of SL-PRS:

1 >

if the conditions for NR sidelink positioning operation as defined in clause 5.8.2 are met:

2 >

if the frequency used for NR sidelink positioning is included in sl-FreqInfoToAddModList in RRCReconfiguration message or sl-FreqInfoList included in SIB23:

3 >

if the UE is configured with sl-RxPool and/or sl-PRS-RxPool included in RRCReconfiguration message with reconfigurationWithSync (i.e. handover):

4 >

configure lower layers to monitor sidelink control information and the corresponding SL-PRS using the pool(s) of resources indicated by sl-RxPool and/or sl-PRS-RxPool;

3 >

else if the cell chosen for NR sidelink positioning provides SIB23:

4 >

configure lower layers to monitor sidelink control information and the corresponding SL-PRS using the pool(s) of resources indicated by sl-RxPool and/or sl-PRS-RxPool in SIB23;

2 >

else:

3 >

configure lower layers to monitor sidelink control information and the corresponding SL-PRS using the pool(s) of resources that were preconfigured by sl-RxPool and/or sl-PRS-RxPool in SL-PreconfigurationNR, as defined in clause 9.3.

5.8.18.3 NR sidelink positioning transmission p. 425

A UE capable of NR sidelink positioning that is configured by upper layers to transmit SL-PRS shall:

1 >

if the conditions for NR sidelink positioning operation as defined in clause 5.8.2 are met:

2 >

if the frequency used for NR sidelink positioning is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message or included in sl-PosConfigCommonNR within SIB23:

3 >

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

4 >

if the UE is configured with sl-ScheduledConfig:

5 >

if T310 for MCG or T311 is running; and if sl-PRS-TxPoolExceptional or sl-TxPoolExceptional is included in sl-FreqInfoList for the concerned frequency in SIB23 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 SIB23 including sl-PRS-TxPoolExceptional or sl-TxPoolExceptional for the concerned frequency; or

5 >

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

6 >

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

5 >

else:

6 >

configure lower layers to perform the sidelink resource allocation scheme 1 for NR sidelink positioning;

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 a result of full sensing, if selected and is allowed by sl-PosAllowedResourceSelectionConfig, on the resources configured in sl-PRS-TxPoolSelectedNormal or by sl-AllowedResourceSelectionConfig, on the resources configured in sl-TxPoolSelectedNormal for the concerned frequency included in sl-ConfigDedicatedNR within RRCReconfiguration is not available in accordance with TS 38.214;

6 >

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

6 >

if the PCell provides SIB25 including sl-TxPoolExceptional or sl-PRS-TxPoolExceptional in sl-FreqInfoList for the concerned frequency:

7 >

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

5 >

else, if the sl-PRS-TxPoolSelectedNormal or sl-TxPoolSelectedNormal for the concerned frequency is included in the sl-ConfigDedicatedNR within RRCReconfiguration:

6 >

configure lower layers to perform the sidelink resource allocation scheme 2 based on resource selection operation according to sl-PosAllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-PRS-TxPoolSelectedNormalNormal for the concerned frequency, or 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 the concerned frequency;

3 >

else:

4 >

if the cell chosen for NR sidelink positioning transmission provides SIB23:

5 >

if SIB23 includes sl-PosTxPoolSelectedNormal for the concerned frequency, and a result of full sensing, if selected and is allowed by sl-PosAllowedResourceSelectionConfig, on the resources configured in the sl-PRS-TxPoolSelectedNormal is available in accordance with TS 38.214 or random selection, if allowed by sl-PosAllowedResourceSelectionConfig, is selected:

6 >

configure lower layers to perform the sidelink resource allocation scheme 2 based on resource selection operation according to sl-PosAllowedResourceSelectionConfig using the pools of resources indicated by sl-PosTxPoolSelectedNormal for the concerned frequency as defined in TS 38.321;

5 >

if SIB23 includes sl-TxPoolSelectedNormal for the concerned frequency, and a result of full sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in the sl-TxPoolSelectedNormal is available in accordance with TS 38.214 or random selection, if allowed by sl-AllowedResourceSelectionConfig, is selected:

6 >

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

5 >

else if SIB23 includes sl-PRS-TxPoolExceptional or sl-TxPoolExceptional for the concerned frequency:

6 >

if a result of full sensing, if selected and is allowed by sl-PosAllowedResourceSelectionConfig, on the resources configured in sl-PRS-TxPoolSelectedNormal or if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-TxPoolSelectedNormal for the concerned frequency in SIB23 is not available in accordance with TS 38.214:

7 >

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

2 >

else:

3 >

configure lower layers to perform the sidelink resource allocation scheme 2 based on resource selection operation according to sl-PosAllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-PRS-TxPoolSelectedNormal in SL-PosPreconfigurationNR for the concerned frequency or based on sl-AllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-TxPoolSelectedNormal in SidelinkPreconfigNR for the concerned frequency..