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Content for  TS 38.331  Word version:  18.0.0

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6.4  RRC multiplicity and type constraint valuesp. 1413

 –  Multiplicity and type constraint definitionsp. 1413

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 –  End of NR-RRC-Definitionsp. 1422

6.5  Short Messagep. 1422

Short Messages can be transmitted on PDCCH using P-RNTI with or without associated Paging message using Short Message field in DCI format 1_0 (see clause 7.3.1.2.1 of TS 38.212).
Table 6.5-1 defines Short Messages. Bit 1 is the most significant bit.
Bit Short Message
1 systemInfoModification
If set to 1: indication of a BCCH modification other than SIB6, SIB7, SIB8 and posSIBs.
2 etwsAndCmasIndication
If set to 1: indication of an ETWS primary notification and/or an ETWS secondary notification and/or a CMAS notification.
3 stopPagingMonitoring
This bit can be used for only operation with shared spectrum channel access and if nrofPDCCH-MonitoringOccasionPerSSB-InPO is present.
If set to 1: indication that the UE may stop monitoring PDCCH occasion(s) for paging in this Paging Occasion as specified in clause 7.1 of TS 38.304.
4 systemInfoModification-eDRX
If set to 1: indication of a BCCH modification other than SIB6, SIB7, SIB8 and posSIBs. This indication applies only to UEs using IDLE eDRX cycle longer than the BCCH modification period.
5 - 8Not used in this release of the specification, and shall be ignored by UE if received.
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6.6  PC5 RRC messagesp. 1423

6.6.1  General message structurep. 1423

 –  PC5-RRC-Definitionsp. 1423

This ASN.1 segment is the start of the PC5 RRC PDU definitions.
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 –  SBCCH-SL-BCH-Messagep. 1424

The SBCCH-SL-BCH-Message class is the set of RRC messages that may be sent from the UE to the UE via SL-BCH on the SBCCH logical channel.
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 –  SCCH-Messagep. 1425

The SCCH-Message class is the set of PC5-RRC messages that may be sent from the UE to the UE for unicast of NR sidelink communication on SCCH logical channel.
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6.6.2  Message definitionsp. 1425

 –  MasterInformationBlockSidelinkp. 1425

The MasterInformationBlockSidelink includes the system information transmitted by a UE via SL-BCH.
Signalling radio bearer:
N/A
RLC-SAP:
TM
Logical channel:
SBCCH
Direction:
UE to UE
MasterInformationBlockSidelink
MasterInformationBlockSidelink field descriptions
directFrameNumber
Indicates the frame number in which S-SSB transmitted.
inCoverage
Value true indicates that the UE transmitting the MasterInformationBlockSidelink is in network coverage, or UE selects GNSS timing as the synchronization reference source.
slotIndex
Indicates the slot index in which S-SSB transmitted.
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 –  MeasurementReportSidelinkp. 1426

The MeasurementReportSidelink message is used for the indication of measurement results of NR sidelink.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
MeasurementReportSidelink message
MeasurementReportSidelink field descriptions
sl-MeasId
Identifies the sidelink measurement identity for which the reporting is being performed.
sl-MeasResult
Measured RSRP results of a unicast destination.
sl-Rsrp-DedicatedSL-PRS-RP
Measured SL PRS-based filtered RSRP.
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 –  NotificationMessageSidelinkp. 1428

The NotificationMessageSidelink message is used to send notification message from U2N Relay UE to the connected U2N Remote UE or from U2U Relay UE to the connected U2U Remote UE.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
U2N Relay UE to U2N Remote UE or U2U Relay UE to U2U Remote UE
NotificationMessageSidelink message
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 –  RemoteUEInformationSidelinkp. 1429

The RemoteUEInformationSidelink message is used to request SIB(s) or provide paging related information as specified in clause 5.8.9.8.1.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
L2 U2N Remote UE to L2 U2N Relay UE
RemoteUEInformationSidelink message
RemoteUEInformationSidelink-IEs field descriptions
connectionForMP
Indicates the connected L2 U2N Relay UE by the L2 U2N Remote UE that the access is for MP.
sl-PagingCycleRemoteUE
Indicates the L2 U2N Remote UE's UE specific DRX cycle as the minimum value of the one provided by upper layers (if configured) and the one provided by RRC layer (if configured). Value rf32 corresponds to 32 radio frames, value rf64 corresponds to 64 radio frames and so on.
sl-PagingIdentityRemoteUE
Indicates the L2 U2N Remote UE's paging UE ID.
sl-PagingInfo-RemoteUE
Indicates the paging information used by L2 U2N Relay UE to perform the connected L2 U2N Remote UE's paging monitoring.
sl-RequestedPosSIB-List
Contains a list of requested PosSIBs.
sl-RequestedSIB-List
Contains a list of requested SIBs.
sl-SFN-DFN-OffsetRequested
If present, this field indicates that the L2 U2N Remote UE requests the L2 U2N Relay UE to provide the SFN-DFN offset in a subsequent RRCReconfigurationSidelink message.
SL-SIB-ReqInfo
Indicates the requested SIB type. Values sibNotReq11, sibNotReq10, ..., sibNotReq1 shall be ignored by L2 U2N relay UE (i.e., no SIB requested).
Conditional Presence Explanation
GNSS-ID-SBASThe field is mandatory present if gnss-id is set to sbas. It is absent otherwise.
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 –  RRCReconfigurationSidelinkp. 1431

The RRCReconfigurationSidelink message is the command to AS configuration of the PC5 RRC connection. It is only applied to unicast of NR sidelink communication.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
RRCReconfigurationSidelink message
RRCReconfigurationSidelink field descriptions
sl-AbsoluteFrequencyPointA
Absolute frequency of the reference resource block (Common RB 0). Its lowest subcarrier is also known as Point A.
sl-CarrierToAddModList
Indicate the carrier(s) to be added/modified for transmission by UE transmitting RRCReconfigurationSidelink message
sl-CarrierToReleaseList
Indicate the carrier(s) to be released for the transmission by UE transmitting RRCReconfigurationSidelink message.
sl-CSI-RS-FreqAllocation
Indicates the frequency domain position for sidelink CSI-RS.
sl-CSI-RS-FirstSymbol
Indicates the position of first symbol of sidelink CSI-RS.
sl-DRX-ConfigUC-PC5
Indicates the NR sidelink DRX configuration for unicast communication, as specified in TS 38.321
sl-LatencyBoundCSI-Report
Indicates the latency bound of SL CSI report from the associated SL CSI triggering in terms of number of slots.
sl-LatencyBoundIUC-Report
Indicates the latency bound of SL Inter-UE coordination report from the associated SL Inter-UE coordination explicit request triggering in terms of number of slots.
sl-LogicalChannelIdentity
Indicates the identity of the sidelink logical channel.
sl-MappedQoS-FlowsToAddList
Indicate the QoS flows to be mapped to the configured sidelink DRB. Each entry is indicated by the SL-PQFI, which is used between UEs, as defined in TS 23.287.
sl-MappedQoS-FlowsToReleaseList
Indicate the QoS flows to be released from the configured sidelink DRB. Each entry is indicated by the SL-PQFI, which is used between UEs, as defined in TS 23.287.
sl-MeasConfig
Indicates the sidelink measurement configuration for the unicast destination.
sl-OffsetToCarrier
Offset in frequency domain between Point A (lowest subcarrier of common RB 0) and the lowest usable subcarrier on this carrier in number of PRBs (using the subcarrierSpacing defined for this carrier). The maximum value corresponds to 275*8-1. See clause 4.4.2 of TS 38.211.
sl-OutOfOrderDelivery
Indicates whether or not outOfOrderDelivery specified in TS 38.323 is configured. This field should be either always present or always absent, after the sidelink radio bearer is established.
sl-PDCP-SN-Size
Indicates the PDCP SN size of the configured sidelink DRB.
sl-Resetconfig
Indicates that the full configuration should be applicable for the RRCReconfigurationSidelink message.
sl-RLC-BearerToAddModList
Indicate the additional Sidelink RLC bearer to be added / modified for the configured sidelink DRB.
sl-RLC-BearerToReleaseList
Indicate the additional Sidelink RLC bearer to be released for the configured sidelink DRB.
sl-SDAP-Header
Indicates whether or not a SDAP header is present on this sidelink DRB.
sl-SFN-DFN-Offset
Indicates the SFN-DFN offset to be used for determining the SFN timeline based on the DFN timeline.
sl-SRB-IdentityWithDuplication
Indicate the sidelink SRB for which duplication is configured.
slrb-PC5-ConfigIndex
Indicates the identity of the configuration of a sidelink DRB. In case of L2 U2U relay, only value 4-31 can be signaled for end-to-end sidelink DRB, and all other values are reserved.
SL-SRAP-ConfigPC5 field descriptions
sl-RemoteUE-LocalIdentity
Indicates the local UE ID of the L2 U2U Remote UE used in SRAP as specified in TS 38.351.
sl-RemoteUE-L2Identity
Indicates the Source L2 ID of the L2 U2U Remote UE as specified in TS 23.304.
sl-PeerRemoteUE-LocalIdentity
Indicates the local UE ID of the peer L2 U2U Remote UE used in SRAP as specified in TS 38.351.
sl-PeerRemoteUE-L2Identity
Indicates the Source L2 ID of the peer L2 U2U Remote UE as specified in TS 23.304.
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 –  RRCReconfigurationCompleteSidelinkp. 1436

The RRCReconfigurationCompleteSidelink message is used to confirm the successful completion of a PC5 RRC AS reconfiguration. It is only applied to unicast of NR sidelink communication.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
RRCReconfigurationCompleteSidelink message
RRCReconfigurationCompleteSidelink field descriptions
dummy
This field is not used in the specification. The UE shall not include this field. If received it shall be ignored by the peer UE.
sl-DRX-ConfigReject
Indicates the rejection of sidelink DRX configuration received from the peer UE for the corresponding NR sidelink unicast communication.
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 –  RRCReconfigurationFailureSidelinkp. 1437

The RRCReconfigurationFailureSidelink message is used to indicate the failure of a PC5 RRC AS reconfiguration. It is only applied to unicast of NR sidelink communication.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
RRCReconfigurationFailureSidelink message
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 –  UEAssistanceInformationSidelinkp. 1438

The UEAssistanceInformationSidelink message may include sidelink DRX assistance information used to determine the sidelink DRX configuration.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
UEAssistanceInformationSidelink message
UEAssistanceInformationSidelink field descriptions
sl-PreferredDRX-ConfigList
Indicates a list of the reference sidelink DRX configurations provided by a UE to a peer UE for determining the sidelink DRX configuration.
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 –  UECapabilityEnquirySidelinkp. 1439

The UECapabilityEnquirySidelink message is used to request UE sidelink capabilities. It is only applied to unicast of NR sidelink communication.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
UECapabilityEnquirySidelink message
UECapabilityEnquirySidelink-IEs field descriptions
frequencyBandListFilterSidelink
This field is used to indicate frequency bands for which the peer UE is requested to provide supported bands and band combinations for NR sidelink communications. The UE always provides this field.
ue-CapabilityInformationSidelink
This field indicates the UECapabilityInformationSidelink message to provide the UE sidelink capability, which can be optionally sent together with UECapabilityEnquirySidelink.
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 –  UECapabilityInformationSidelinkp. 1439

The UECapabilityInformationSidelink message is used to transfer UE radio access capabilities. It is only applied to unicast of NR sidelink communication.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
UE to UE
UECapabilityInformationSidelink message
Up

 –  UEInformationRequestSidelinkp. 1442

The UEInformationRequestSidelink message is used to transfer UE information in sidelink, e.g. the end-to-end QoS information for L2 U2U Relay operation.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
L2 U2U Remote UE to L2 U2U Relay UE
UEInformationRequestSidelink message
UEInformationRequestSidelink field descriptions
SL-E2E-QoS-ConnectionListPC5
Indicates the QoS info for a list of end-to-end PC5 connections with each connection indicated by the destination L2 ID of the peer L2 U2U Remote UE.
Up

 –  UEInformationResponseSidelinkp. 1443

The UEInformationResponseSidelink message is used to deliver UE information in sidelink, e.g. the split QoS information for L2 U2U Relay operation.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
L2 U2U Relay UE to L2 U2U Remote UE
UEInformationResponseSidelink message
UEInformationResponseSidelink field descriptions
sl-SplitQoS-ConnectionListPC5
Indicates the split PDB on the first PC5 hop between L2 U2U Relay UE and the L2 U2U Remote UE for a list of end-to-end connection.
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 –  UuMessageTransferSidelinkp. 1444

The UuMessageTransferSidelink message is used for the sidelink transfer of Paging message and System Information messages.
Signalling radio bearer:
SL-SRB3
RLC-SAP:
AM
Logical channel:
SCCH
Direction:
L2 U2N Relay UE to L2 U2N Remote UE
UuMessageTransferSidelink message
UuMessageTransferSidelink-IEs field descriptions
sl-PagingDelivery
This field is used to transfer PagingRecord and PagingRecord-v1700 relevant to the L2 U2N Remote UE in RRC_IDLE or RRC_INACTIVE.
sl-SIB1-Delivery
This field is used to transfer SIB1 to the L2 U2N Remote UE in RRC_IDLE or RRC_INACTIVE.
sl-SystemInformationDelivery
This field is used to transfer SIBs and posSIBs to the L2 U2N Remote UE in RRC_IDLE or RRC_INACTIVE.
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 –  End of PC5-RRC-Definitionsp. 1445


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