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…

5.8.9.8 Remote UE information 5.8.9.8.1 General 5.8.9.8.2 Actions related to transmission of RemoteUEInformationSidelink message 5.8.9.8.3 Reception of RemoteUEInformationSidelink message by the L2 U2N Relay UE 5.8.9.9 Uu message transfer in sidelink 5.8.9.9.1 General 5.8.9.9.2 Actions related to transmission of UuMessageTransferSidelink message 5.8.9.9.3 Reception of the UuMessageTransferSidelink 5.8.9.10 Notification Message 5.8.9.10.1 General 5.8.9.10.2 Initiation 5.8.9.10.3 Actions related to transmission of NotificationMessageSidelink message 5.8.9.10.4 Actions related to reception of NotificationMessageSidelink message 5.8.9.11 Sidelink UE information 5.8.9.11.1 General 5.8.9.11.2 Actions related to transmission of the UEInformationRequestSidelink by the UE 5.8.9.11.3 Actions related to reception of the UEInformationRequestSidelink by the UE
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5.8.9.8 Remote UE information p. 402

5.8.9.8.1 General p. 402

Reproduction of 3GPP TS 38.331, Fig. 5.8.9.8.1-1: Remote UE information

Figure 5.8.9.8.1-1: Remote UE information

This procedure is used by the L2 U2N Remote UE in RRC_IDLE/RRC_INACTIVE to inform about the required SIB(s) /posSIB(s), provide Paging related information to the connected L2 U2N Relay UE, and request the SFN-DFN offset from the connected L2 U2N Relay UE.

This procedure is used by the L2 U2N Remote UE in RRC_CONNECTED to request the SFN-DFN offset from the connected L2 U2N Relay UE.

5.8.9.8.2 Actions related to transmission of RemoteUEInformationSidelink message p. 402

When entering RRC_IDLE or RRC_INACTIVE, or upon change in any of the information in the RemoteUEInformationSidelink while in RRC_IDLE or RRC_INACTIVE, the L2 U2N Remote UE shall:

1 >

if the UE has SIB request information to provide (e.g. the UE has not stored a valid version of a SIB, in accordance with clause 5.2.2.2.1, of one or several required SIB(s) in accordance with clause 5.2.2.1 and the requested SIB has not been indicated in RemoteUEInformationSidelink message to the L2 U2N Relay UE before):

2 >

include sl-RequestedSIB-List in the RemoteUEInformationSidelink to indicate the requested SIB(s);

1 >

if the UE has not stored a valid version, in accordance with clause 5.2.2.2.1, of one or several posSIB(s) that the UE requires for a positioning operation, and the requested posSIB has not been indicated in RemoteUEInformationSidelink message to the L2 U2N Relay UE before, and the connected L2 U2N relay UE set posSIB-ForwardingSupported to supported:

2 >

include sl-RequestedPosSIB-List in the RemoteUEInformationSidelink to indicate the requested posSIB(s);

1 >

if the UE needs the SFN-DFN offset based on the request from upper layers and the connected L2 U2N relay UE set sfn-DFN-OffsetSupported to supported:

2 >

set sl-SFN-DFN-OffsetRequested to true;

1 >

if the UE has paging related information to provide (e.g. the UE has not sent sl-PagingInfo-RemoteUE in the RemoteUEInformationSidelink message to the L2 U2N Relay UE before), set sl-PagingInfo-RemoteUE as follows:

2 >

if the L2 U2N Remote UE is in RRC_IDLE:

3 >

include ng-5G-S-TMSI in the sl-PagingIdentityRemoteUE;

3 >

if the UE specific DRX cycle is configured by upper layer, set sl-PagingCycleRemoteUE to the value of UE specific Uu DRX cycle configured by upper layer;

2 >

else if the L2 U2N Remote UE is in RRC_INACTIVE:

3 >

include ng-5G-S-TMSI and fullI-RNTI in the sl-PagingIdentityRemoteUE;

3 >

if the UE specific DRX cycle is configured by upper layer,

4 >

set sl-PagingCycleRemoteUE to the minimum value of UE specific Uu DRX cycles (configured by upper layer and configured by RRC);

3 >

else:

4 >

set sl-PagingCycleRemoteUE to the value of UE specific DRX cycle configured by RRC;

1 >

submit the RemoteUEInformationSidelink message to lower layers for transmission;

When entering RRC_CONNECTED, if L2 U2N remote UE had sent sl-RequestedSIB-List, sl-RequestedPosSIB-List, and/or sl-PagingInfo-RemoteUE, the L2 U2N Remote UE shall:

1 >

set the sl-RequestedSIB-List to the value release if requested before;

1 >

set the sl-RequestedPosSIB-List to the value release if requested before;

1 >

set the sl-PagingInfo-RemoteUE to the value release if sent before;

1 >

submit the RemoteUEInformationSidelink message to lower layers for transmission;

Upon any change in the need of SFN-DFN offset while in RRC_CONNECTED, the L2 U2N Remote UE shall:

1 >

if the UE needs the SFN-DFN offset based on the request from upper layers and the connected L2 U2N relay UE set sfn-DFN-OffsetSupported to supported:

2 >

set sl-SFN-DFN-OffsetRequested to true;

1 >

submit the RemoteUEInformationSidelink message to lower layers for transmission;

The L2 U2N Remote UE in RRC_CONNECTED shall:

1 >

if the UE is configured with sl-IndirectPathAddChange set to setup, and not configured with split SRB1 with duplication:

2 >

include connectionForMP;

5.8.9.8.3 Reception of RemoteUEInformationSidelink message by the L2 U2N Relay UE p. 403

The L2 U2N Relay UE shall:

1 >

if the RemoteUEInformationSidelink includes the sl-PagingInfo-RemoteUE:

2 >

if the UE is in RRC_CONNECTED on an active BWP with common search space configured including pagingSearchSpace; or

2 >

if the UE is in RRC_IDLE or RRC_INACTIVE:

3 >

if the sl-PagingInfo-RemoteUE is set to setup:

4 >

monitor the Paging message at the L2 U2N Remote UE's paging occasion calculated according to sl-PagingIdentityRemoteUE and sl-PagingCycleRemoteUE included in sl-PagingInfo-RemoteUE;

3 >

else (the sl-PagingInfo-RemoteUE is set to release):

4 >

stop monitoring the Paging message at the L2 U2N Remote UE's paging occasion;

4 >

release the received paging information in sl-PagingInfo-RemoteUE;

2 >

else (the UE is in RRC_CONNECTED on an active BWP without pagingSearchSpace configured):

3 >

if the sl-PagingInfo-RemoteUE is set to setup:

4 >

include the received sl-PagingIdentityRemoteUE in SidelinkUEInformationNR message and perform Sidelink UE information transmission in accordance with clause 5.8.3;

3 >

else (the sl-PagingInfo-RemoteUE is set to release):

4 >

initiate transmission of the SidelinkUEInformationNR message to release the sl-PagingIdentityRemoteUE in SidelinkUEInformationNR message in accordance with clause 5.8.3;

4 >

release the received paging information in sl-PagingInfo-RemoteUE;

1 >

if the RemoteUEInformationSidelink includes the sl-RequestedSIB-List:

2 >

if the sl-RequestedSIB-List is set to setup:

3 >

if the L2 U2N Relay UE has not stored a valid version of SIB(s) indicated in sl-RequestedSIB-List:

4 >

perform acquisition of the system information indicated in sl-RequestedSIB-List in accordance with clause 5.2.2;

3 >

perform the Uu message transfer procedure in accordance with clause 5.8.9.9;

2 >

if the sl-RequestedSIB-List is set to release:

3 >

release received SIB request in sl-RequestedSIB-List;

1 >

if the RemoteUEInformationSidelink includes the sl-RequestedPosSIB-List:

2 >

if the sl-RequestedPosSIB-List is set to setup:

3 >

if the L2 U2N Relay UE has not stored a valid version of posSIB(s) indicated in sl-RequestedPosSIB-List:

4 >

perform acquisition of the positioning system information indicated in sl-RequestedPosSIB-List in accordance with clause 5.2.2;

3 >

perform the Uu message transfer procedure in accordance with clause 5.8.9.9;

2 >

if the sl-RequestedPosSIB-List is set to release:

3 >

release received posSIB request in sl-RequestedPosSIB-List.

1 >

if the RemoteUEInformationSidelink includes the connectionForMP:

2 >

if the L2 U2N Relay UE is in RRC_IDLE:

3 >

initiate an RRC connection establishment as specified in clause 5.3.3;

2 >

else if the L2 U2N Relay UE is in RRC_INACTIVE:

3 >

initiate an RRC connection resume as specified in clause 5.3.13;

5.8.9.9 Uu message transfer in sidelink p. 404

5.8.9.9.1 General p. 404

Reproduction of 3GPP TS 38.331, Fig. 5.8.9.9.1-1: Uu message transfer in sidelink

Figure 5.8.9.9.1-1: Uu message transfer in sidelink

The purpose of this procedure is to transfer Paging message and System Information from the L2 U2N Relay UE to the L2 U2N Remote UE in RRC_IDLE/RRC_INACTIVE.

5.8.9.9.2 Actions related to transmission of UuMessageTransferSidelink message p. 404

The L2 U2N Relay UE initiates the Uu message transfer procedure when at least one of the following conditions is met:

1 >

upon receiving Paging message related to the connected L2 U2N Remote UE from network (including Paging message within RRCReconfiguration message);

1 >

upon acquisition of the SIB(s) requested by the connected L2 U2N Remote UE (as indicated in sl-RequestedSIB-List in the RemoteUEInformationSidelink) or upon receiving the updated SIB(s) from network which has been requested by the connected L2 U2N Remote UE;

1 >

upon acquisition of the posSIB(s) requested by the connected L2 U2N Remote UE (as indicated in sl-RequestedPosSIB-List in the RemoteUEInformationSidelink) or upon receiving the updated posSIB(s) from network which have been requested by the connected L2 U2N Remote UE;

1 >

upon unsolicited SIB1 forwarding to the connected L2 U2N Remote UE or upon receiving the updated SIB1 from network;

For each associated L2 U2N Remote UE, the L2 U2N Relay UE shall set the contents of UuMessageTransferSidelink message as follows:

1 >

include sl-PagingDelivery if the Paging message received from network containing the ue-Identity of the L2 U2N Remote UE;

1 >

include sl-SIB1-Delivery if any of the conditions for initiating Uu message transfer procedure related to SIB1 are met;

1 >

include sl-SystemInformationDelivery if any of the conditions for initiating Uu message transfer procedure related to System Information are met;

1 >

submit the UuMessageTransferSidelink message to lower layers for transmission.

5.8.9.9.3 Reception of the UuMessageTransferSidelink p. 405

Upon receiving the UuMessageTransferSidelink message, the L2 U2N Remote UE shall:

1 >

if sl-PagingDelivery is included:

2 >

perform the paging reception procedure as specified in clause 5.3.2.3;

1 >

if sl-SystemInformationDelivery and/or sl-SIB1-Delivery is included:

2 >

perform the actions specified in clause 5.2.2.4.

5.8.9.10 Notification Message p. 405

5.8.9.10.1 General p. 405

Reproduction of 3GPP TS 38.331, Fig. 5.8.9.10.1-1: Notification message in sidelink

Figure 5.8.9.10.1-1: Notification message in sidelink

This procedure is used by a U2N Relay UE to send notification to the connected U2N Remote UE, or used by a U2U Relay UE to send notification to the peer connected U2U Remote UE when condition(s) as specified in 5.8.9.10.2 is met with the connected U2U Remote UE.

5.8.9.10.2 Initiation p. 405

The Relay UE may initiate the procedure when one of the following conditions is met:

1 >

if the UE is acting as U2N Relay UE:

2 >

upon Uu RLF as specified in clause 5.3.10;

2 >

upon reception of an RRCReconfiguration including the reconfigurationWithSync;

2 >

upon cell reselection;

2 >

upon L2 U2N Relay UE's RRC connection failure including RRC connection reject as specified in clause 5.3.3.5 and clause 5.3.13.10, and T300 expiry as specified in clause 5.3.3.7, and RRC resume failure as specified in clause 5.3.13.5;

1 >

if the UE is acting as L2 U2U Relay UE:

2 >

upon detection of PC5 RLF with L2 U2U Remote UE as specified in clause 5.8.9.3;

5.8.9.10.3 Actions related to transmission of NotificationMessageSidelink message p. 406

The Relay UE shall set the indication type as follows:

1 >

if the UE is acting as U2N Relay UE:

2 >

if the UE initiates transmission of the NotificationMessageSidelink message due to Uu RLF:

3 >

set the indicationType as relayUE-Uu-RLF;

2 >

else if the UE initiates transmission of the NotificationMessageSidelink message due to reconfiguration with sync:

3 >

set the indicationType as relayUE-HO;

2 >

else if the UE initiates transmission of the NotificationMessageSidelink message due to cell reselection:

3 >

set the indicationType as relayUE-CellReselection;

2 >

if the UE initiates transmission of the NotificationMessageSidelink message due to Uu RRC connection establishment/Resume failure:

3 >

set the indicationType as relayUE-Uu-RRC-Failure;

2 >

submit the NotificationMessageSidelink message to lower layers for transmission.

1 >

if the UE is acting as L2 U2U Relay UE:

2 >

if the UE initiates transmission of the NotificationMessageSidelink message due to PC5 RLF with L2 U2U Remote UE:

3 >

set the sl-IndicationType as relayUE-PC5-RLF;

3 >

set the sl-DestinationIdentityRemoteUE as the associated destination for L2 U2U Remote UE;

3 >

submit the NotificationMessageSidelink message to lower layers for transmission;

5.8.9.10.4 Actions related to reception of NotificationMessageSidelink message p. 406

Upon receiving the NotificationMessageSidelink, the Remote UE shall:

1 >

if the UE is acting as U2N Remote UE:

2 >

if the indicationType is included:

3 >

if the UE is L2 U2N Remote UE in RRC_CONNECTED:

4 >

if MP is configured and MCG transmission (i.e. direct path) is not suspended;

5 >

initiate the indirect path failure information procedure as specified in clause 5.7.3c to report indirect path failure;

4 >

else if T301 is not running, initiate the RRC connection re-establishment procedure as specified in clause 5.3.7;

3 >

else (the UE is L3 U2N Remote UE, or L2 U2N Remote UE in RRC_IDLE or RRC_INACTIVE):

4 >

if the PC5-RRC connection with the U2N Relay UE is determined to be released:

5 >

indicate upper layers to trigger PC5 unicast link release;

4 >

else (i.e., maintain the PC5 RRC connection):

5 >

if the UE is L2 U2N Remote UE and the indicationType is relayUE-HO or relayUE-CellReselection:

6 >

consider cell re-selection occurs;

1 >

if the UE is acting as L2 U2U Remote UE:

2 >

if sl-IndicationType is relayUE-PC5-RLF:

3 >

indicate PC5 RLF received from L2 U2U Relay UE to the upper layers for the indicated L2 U2U Remote UE based on the received sl-DestinationIdentityRemoteUE;

3 >

perform PC5 RLF related actions as specified in clause 5.8.9.3, for the indicated L2 U2U Remote UE based on the received sl-DestinationIdentityRemoteUE;

5.8.9.11 Sidelink UE information p. 407

5.8.9.11.1 General p. 407

Reproduction of 3GPP TS 38.331, Fig. 5.8.9.11.1-1: Sidelink UE information procedure

Figure 5.8.9.11.1-1: Sidelink UE information procedure

This purpose of this procedure is to transfer the UE information in sidelink. The L2 U2U Remote UE informs its end-to-end QoS information to its connected L2 U2U Relay UE in the UEInformationRequestSidelink message, and the L2 U2U Relay UE delivers the split QoS information of the first-hop to the Remote UE in the UEInformationResponseSidelink message.

5.8.9.11.2 Actions related to transmission of the UEInformationRequestSidelink by the UE p. 407

For initial information transfer (e.g. for QoS split) or upon change in any of the information in the UEInformationRequestSidelink, the UE shall set the contents of UEInformationRequestSidelink message as follows:

1 >

if the UE is acting as L2 U2U Remote UE:

2 >

set sl-E2E-QoS-ConnectionListPC5 to include the end-to-end QoS profile(s) of the sidelink QoS flow(s) of peer L2 U2U Remote UE if configured by the upper layer, and for each entry:

3 >

set sl-DestinationIdentityRemoteUE to include the associated destination identity for peer L2 U2U Remote UE if configured by the upper layer;

2 >

submit the UEInformationRequestSidelink message to lower layers for transmission;

5.8.9.11.3 Actions related to reception of the UEInformationRequestSidelink by the UE p. 408

The UE shall perform the following actions upon reception of the UEInformationRequestSidelink:

1 >

if the UE is acting as L2 U2U Relay UE:

2 >

if the UEInformationRequestSidelink includes the sl-E2E-QoS-ConnectionListPC5:

3 >

perform QoS split based on the sl-QoS-InfoList for each QoS flow to decide the split PDB value for each PC5 hop;

3 >

set the contents of UEInformationResponseSidelink message as follows:

4 >

set sl-SplitQoS-InfoListPC5 to include the split PDB value for each QoS flow on the fisrt PC5 hop between L2 U2U Relay UE and L2 U2U Remote UE;

4 >

set sl-DestinationIdentityRemoteUE to include the associated destination identity for peer L2 U2U Remote UE if configured by the upper layer;

3 >

submit the UEInformationResponseSidelink message to lower layers for transmission;