5G Standalone Access Registration Signaling Messages

#5G Standalone Access Registration Signaling Messages| 来源: 网络整理| 查看: 265

This document details messages involved in the 5G standalone access registration procedure. These messages are referenced from the 5G Standalone Access Registration Sequence Diagrams.

Message Path Preamble UE ➔ gNB PDCCH DCI Format 1_0 └Format 1_0 - CRC Scrambled with RA-RNTI gNB ➔ UE Random Access Response └MAC PDU └MAC Payload for Random Access Response └RAR UL Grant gNB ➔ UE RRCSetupRequest UE ➔ gNB PDCCH DCI Format 1_0 └Format 1_0 - CRC Scrambled with C-RNTI gNB ➔ UE RRCSetup ├RadioBearerConfig └CellGroupConfig gNB ➔ UE PDCCH DCI Format 0_0 └Format 0_0 - CRC Scrambled with C-RNTI gNB ➔ UE RRCSetupComplete └Registration Request UE ➔ gNB Initial UE Message └Registration Request gNB ➔ New AMF Namf_Communication_UEContextTransfer Request └Registration Request New AMF ➔ Old AMF Namf_Communication_UEContextTransfer Response └UE Context in AMF Old AMF ➔ New AMF Identity Request New AMF ➔ gNB ➔ UE Identity Response UE ➔ gNB ➔ New AMF Nausf_UEAuthenticate_authenticate Request New AMF ➔ AUSF Nudm_UEAuthenticate_Get Request AUSF ➔ UDM Nudm_UEAuthenticate_Get Response UDM ➔ AUSF Nausf_UEAuthenticate_authenticate Response AUSF ➔ New AMF Authentication Request New AMF ➔ gNB ➔ UE Authentication Response UE ➔ gNB ➔ New AMF NAS Security Mode Command New AMF ➔ gNB ➔ UE NAS Security Mode Complete UE ➔ gNB ➔ New AMF N5g-eir_EquipmentIdentityCheck Request New AMF ➔ 5G-EIR N5g-eir_EquipmentIdentityCheck Response 5G-EIR ➔ New AMF Namf_Communication_RegistrationCompleteNotify New AMF ➔ Old AMF Nudm_UEContextManagement_Registration Request └Amf3GppAccessRegistration New AMF ➔ UDM Nudm_UEContextManagement_Registration Response UDM ➔ New AMF Nudm_SubscriberDataManagement_Get Request New AMF ➔ UDM Nudm_SubscriberDataManagement_Get Response ├AccessAndMobilitySubscriptionData ├SmfSelectionSubscriptionData └UeContextInSmfData UDM ➔ New AMF Nudm_UEContextManagement_Deregistration_Notify UDM ➔ Old AMF Nsmf_PDUSession_ReleaseSMContext Old AMF ➔ SMF Npcf_AMPolicyControl_Create Request New AMF ➔ PCF Npcf_AMPolicyControl_Create Response └PolicyAssociation └PolicyAssociationRequest PCF ➔ New AMF Namf_EventExpose_Subscribe Request └AmfCreateEventSubscription └AmfEventSubscription PCF ➔ New AMF Namf_EventExpose_Subscribe Response └AmfCreatedEventSubscription New AMF ➔ PCF Npcf_AMPolicyControl_Delete Request Old AMF ➔ PCF Npcf_AMPolicyControl_Delete Response PCF ➔ Old AMF Nsmf_PDUSession_UpdateSMContext Request New AMF ➔ SMF PFCP Session Modification Request SMF ➔ UDF PFCP Session Modification Response UDF ➔ SMF Nsmf_PDUSession_UpdateSMContext Response SMF ➔ New AMF Initial Context Setup Request └Registration Accept New AMF ➔ gNB SecurityModeCommand gNB ➔ UE SecurityModeComplete UE ➔ gNB RRCReconfiguration ├Registration Accept ├RadioBearerConfig ├secondaryCellGroup ├MeasConfig └masterCellGroup gNB ➔ UE RRCReconfigurationComplete └UplinkTxDirectCurrentList UE ➔ gNB Initial Context Setup Response gNB ➔ New AMF Registration Complete UE ➔ gNB Nsmf_PDUSession_UpdateSMContext Request New AMF ➔ SMF PFCP Session Modification Request SMF ➔ UDF PFCP Session Modification Response UDF ➔ SMF Nsmf_PDUSession_UpdateSMContext Response SMF ➔ New AMF Preamble

UE ➔ gNB

TS 38.213, TS 38.321, TS 38.211

The UE picks a random preamble. The preamble is referenced with the Random Access Preamble Id (RAPID). The preamble transmission is a Zadoff-Chu sequence.

Each preamble transmission is associated with an RA-RNTI.

RA-RNTI

The RA-RNTI associated with the PRACH in which the Random Access Preamble is transmitted, is computed as:

RA-RNTI= 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id

Where:

Identifier Description s_id Index of the first OFDM symbol of the specified PRACH (0 ≤ s_id < 14) t_id Index of the first slot of the specified PRACH in a system frame (0 ≤ t_id < 80) f_id Index of the specified PRACH in the frequency domain (0 ≤ f_id < 8) ul_carrier_id Uplink carrier used for Msg1 transmission (0 for NUL carrier, and 1 for SUL carrier) PDCCH DCI Format 1_0

gNB ➔ UE

TS 38.212

DCI Format 1_0 is used to assign downlink resources.

Format 1_0 - CRC Scrambled with RA-RNTI

In response to a PRACH transmission, a UE attempts to detect a DCI Format 1_0 with PDCCH CRC scrambled by the RA-RNTI corresponding to the RACH transmission. The UE looks for message during a configured window of length ra-ResponseWindow.

The RA-RNTI scrambled DCI message signals the frequency and time resources assigned for the transmission of the Transport Block containing the Random Access Response message.

The following information is transmitted by means of the RA-RNTI scrambled DCI Format 1_0:

Field Bits Frequency domain resource assignment ⌈log2(NRBDL,BWP(NRBDL,BWP + 1)/2)⌉NRBDL,BWP is the size of CORESET 0 Time domain resource assignment 4 VRB-to-PRB mapping 1 Modulation and coding scheme 5 TB scaling 2 Reserved bits 16 Format 1_0 - CRC Scrambled with C-RNTI

The following information is transmitted by a DCI Format 1_0 with PDCCH CRC scrambled by the assigned C-RNTI:

Field Bits Identifier of DCI formats 1 Frequency domain resource assignment ⌈log2(NRBDL,BWP(NRBDL,BWP + 1)/2)⌉NRBDL,BWP is the size of the active DL bandwidth part in case DCI format 1_0is monitored in the UE specific search space if DCH sizes

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