1. RRCSetupRequest (UE —> gNB-DU)

![](https://img-blog.csdnimg.cn/20200523103744954.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI4MDA4MjU=,size_16,color_FFFFFF,t_70) ------------------------------------------------------------------------------------------------ # 1. RRCSetupRequest (UE —> gNB-DU) ### 目的 - 請求建立RRC連接 ### 攜帶的消息 - UE標識 1. ue-Identity (39bit) a. ng-5G-S-TMSI-Part1 b. randomValue - RRC連接建立原因 1. emergency 2. highPriorityAccess (極有可能攜帶) 3. mt-Access 4. mo-Signalling (極有可能攜帶) 5. mo-Data 6. mo-VoiceCall 7. mo-VideoCall 8. mo-SMS 9. mps-PriorityAccess 10. mcs-PriorityAccess etc. ### Others - 承載信令 - SRB0 - SRB0上承載的信令有 - RCConnectionRequest - RRCConnectionReject - RRCConnectionSetup & RRCConnectionReestablishmentRequest - RRCConnectionReestablishment - RRCConnectionReestablishmentReject - 邏輯信道 - CCCH - 公共控制信道(CCCH)是一種"一點對多點"的雙向控制信道，其用途是在呼叫接續階段，傳輸鏈路連線所需要的控制信令與信息；用於邏輯層到傳輸層的信令傳遞 ------------------------------------------------------------------------------------------------ # 2. INITIAL UL RRC MESSAGE TRANSFER (gNB-DU —> gNB-CU-CP) ### 目的 - 發送第一條RRC消息到gNB-CU ### 攜帶的消息 - gNB-DU UE F1AP ID - NR CGI: NR小區全球標識，PLMN Identity + NR cell Identity - C-RNTI: 在隨機接入過程中，由gNB-DU分配 - RRC-Container: 攜帶RRC消息 - UE接入時，為RRCSetupRequest - DU to CU RRC Container: 可選 - 若該消息中未攜帶該IE，gNB-CU認為gNB-DU不允許UE接入 - 若gNB-DU允許該UE接入，則必須在該IE中攜帶CellGroupConfig，但不包括 ReconfigurationWithSync - CellGroupConfig: 至少需要攜帶SRB1的配置信息 - SUL Access Indication: 可選 - Transaction ID: 必填 ### Others - 該過程將會建立UE級的F1連接 ------------------------------------------------------------------------------------------------ # 3. DL RRC MESSAGE TRANSFER(gNB-CU-CP —> gNB-DU) ### 目的 - 轉發RRC消息RRCSetup給gNB-DU ### 攜帶的消息 - gNB-CU UE F1AP ID - gNB-DU UE F1AP ID - SRB ID: 1 - RRC-Container: 攜帶RRC消息 - UE接入時，為RRCSetup - Execute Duplication: 若SRB duplication功能已激活，則需要攜帶該UE - RAT-Frequency Priority Information - RRC Delivery Status Request: 指示是否需要RRC DELIVERY REPORT ------------------------------------------------------------------------------------------------ # 4. RRCSetup(gNB-DU —> UE) ## 目的 - 將SRB1的配置帶給UE，以建立SRB1 ### 攜帶的消息 - SBR1的相关配置 - radioBearerConfig: 詳細參考協議38.311 6.3.2 -UE接入時，僅攜帶建立SRB1的配置 - masterCellGroup: 包括S - RB1的RLC承載 - mac-CellGroupConfig - physicalCellGroupConfig - spCellConfig 詳細參考協議38.311 6.3.2 ------------------------------------------------------------------------------------------------ # 5. RRCSetup(gNB-DU —> UE) ### 目的 - 通知網路端，RRC連接建立完成 ### 攜帶的消息 - selectedPLMN-Identity: UE從SIB1中攜帶的plmn-IdentityList裡所選PLMN的索引值 - registeredAMF: 可選 plmn-Identity + amf-Identifier - guami-Type: GUAMI類型，native or mapped - s-NSSAI-List: 可選 - dedicatedNAS-Message: UE帶給核心網的第一條NAS消息 - ng-5G-S-TMSI-Value: 可選 ### Others - 承載信令: SRB1 - 邏輯信道: DCCH - DCCH: Dedicated Control Channel (專用控制通道是一種"點對點"的雙向控制通道，其用途是在呼叫接續階段和在通信進行當中，在移動台和基站之間傳輸必需的控制信息) ------------------------------------------------------------------------------------------------ # 6. UL RRC MESSAGE TRANSFER(gNB-DU —> gNB-CU-CP) ### 目的 - 將RRC CONNECTION SETUP COMPLETE消息封裝起來，帶給gNB-CU ### 攜帶消息 - gNB-CU UE F1AP ID - gNB-DU UE F1AP ID - SRB ID - RRC-Container(攜帶RRC CONNECTION SETUP COMPLETE) ------------------------------------------------------------------------------------------------ # 7. INITIAL UE MESSAGE (gNB-CU-CP —> AMF) ### 目的 - 將UE想要入網的消息告訴核心網 ### 攜帶消息 - RAN UE NGAP ID: 該參數由NG-RAN分配 - NAS-PDU: 攜帶UE發送給AMF的消息 - User Location Information: 以下3選1 1. E-UTRA user location: E-UTRA CGI + TAI + Age of Location 2. NR user location: NR CGI + TAI + Age of Location 3. N3IWF user location information: IP Address + Port Number(可選) - RRC Establishment Cause : RRCSetupRequest消息中攜帶的那個原因值 - 5G-S-TMSI: 可選若UE在RRC CONNECTION SETUP COMPLETE消息中攜帶了該IE，則gNB-CU需要攜帶該IE - UE Context Request: 可選 - Allowed NSSAI: 可選 ------------------------------------------------------------------------------------------------ # 8. INITIAL CONTEXT SETUP REQUEST(AMF —> gNB-CU-CP) ## 攜帶消息 - AMF UE NGAP ID: 由AMF分配 - RAN UE NGAP ID: INITIAL UE MESSAGE消息攜帶的那個值 - Old AMF: 可選 - UE Aggregate Maximum Bit Rate: 可選 - Core Network Assistance Information: 可選的，UE RRC_INACTIVE時的相關配置 - UE Identity Index Value - UE Specific DRX、Periodic Registration Update Timer - MICO Mode Indication - AI List for RRC Inactive - Expected UE Behaviour - GUAMI: PLMN Identity + AMF Region ID + AMF Set ID + AMF Pointer - Allowed NSSAI: 指示是否允許S-NSSAI - UE Security Capabilities: - NR Encryption Algorithms - NR Integrity Protection Algorithms - E-UTRA Encryption Algorithms - E-UTRA Integrity Protection Algorithms - Security Key: - Trace Activation: 可選trace session activation - Mobility Restriction List: 可選 - UE Radio Capability: 可選包括NR, MR-DC, E-UTRA 的接入能力 - Index to RAT/Frequency Selection Priority: 可選 - Masked IMEISV: 可選 - NAS-PDU: 可選 - Emergency Fallback Indicator: 可選 - RRC Inactive Transition Report Request: 可選 - UE Radio Capability for Paging: 可選 - Redirection for Voice EPS Fallback: 可選 ------------------------------------------------------------------------------------------------ # 9. BEARER CONTEXT SETUP REQUEST(gNB-CU-CP —> gNB-CU-UP) ## 目的 - 在gNB-CU-CP建立UE的承載上下文 ## 攜帶的消息 - gNB-CU-CP UE E1AP ID - Security Information: - 配置用戶面的加密完整性保護參數 - Security Algorithm - User Plane Security Keys - UE DL Aggregate Maximum Bit Rate - UE DL Maximum Integrity Protected Data Rate: 可選 - Serving PLMN - Activity Notification Level: - DRB - PDU Session - UE - Bearer Context Status Change: 指示承載上下文的狀態，Suspend, Resume... - CHOICE System: E-UTRAN 或 NR - E-UTRAN: - DRB To Setup List - NR: - PDU Session Resource To Setup List - DRB To Setup List ------------------------------------------------------------------------------------------------ # 10. BEARER CONTEXT SETUP RESPONSE(gNB-CU-UP —> gNB-CU-CP) ## 目的 - gNB-CU-UP告訴gNB-CU-CP承載建立結果 ## 攜帶的消息 - gNB-CU-CP UE E1AP ID - gNB-CU-UP UE E1AP ID - CHOICE System: E-UTRAN 或 NR - E-UTRAN: - DRB建立成功的列表 - DRB建立失敗的列表 - NR - PDU Session Resource建立成功的列表；PDU Session Resource建立失敗的列表 - 對於每一個 PDU Session Resource，列出DRB建立成功的列表和DRB建立失敗的列表 - 對於每一個DRB，列出成功的QoS Flows和失敗的QoS Flows ------------------------------------------------------------------------------------------------ # 11. UE CONTEXT SETUP REQUEST(gNB-CU-CP —> gNB-DU) ### 目的 - 建立SRB和DRB承載 ### 攜帶的消息 - gNB-CU UE F1AP ID - gNB-DU UE F1AP ID: 可選 - SpCell ID: - ServCellIndex: 0~31 - SpCell UL Configured: 用於指示gNB-DU是否需要配置sPcell UL相關配置 - CU to DU RRC Information: - CG-ConfigInfo - UE-CapabilityRAT-ContainerList - MeasConfig - Handover Preparation Information - CellGroupConfig - Measurement Timing Configuration - UEAssistanceInformation - Candidate SpCell List - SCell To Be Setup List - SRB to Be Setup List - DRB to Be Setup List - Inactivity Monitoring Request - RAT-Frequency Priority Information - RRC-Container - gNB-DU UE Aggregate Maximum Bit Rate Uplink: 只要建立DRB，就必須攜帶該IE - Serving PLMN - RRC Delivery Status Request - Resource Coordination Transfer Information - servingCellMO: ??? ------------------------------------------------------------------------------------------------ # 12. SecurityModeCommand(gNB-DU —> UE) ### 目的 - 激活AS安全 ### 攜帶的消息 - securityAlgorithmConfig，加密和完整(可選)算法 ------------------------------------------------------------------------------------------------ # 13. SecurityModeCommand(gNB-DU —> UE) ## 目的 - 確認SRB、DRB承載建立情況 ## 攜帶消息 - gNB-CU UE F1AP ID - gNB-DU UE F1AP ID - DU To CU RRC Information: - C-RNTI: 可選 - Resource Coordination Transfer Container - Full Configuration - DRB Setup List: DRB建立成功的列表信息 - DRB Failed to Setup List: DRB建立失敗的列表信息 - SRB Setup List: SRB建立成功的列表信息 - DRB Failed to Setup List - SCell Failed To Setup List - Inactivity Monitoring ------------------------------------------------------------------------------------------------ # 14. BEARER CONTEXT MODIFICATION REQUEST(gNB-CU-CP —> gNB-CU-UP) ------------------------------------------------------------------------------------------------ # 15. BEARER CONTEXT MODIFICATION RESPONSE(gNB-CU-UP —> gNB-CU-CP) ------------------------------------------------------------------------------------------------ # 16. SecurityModeComplete (UE —> gNB-DU) ### 目的 - 確認激活了AS安全 ### 攜帶的消息： - on or something ------------------------------------------------------------------------------------------------ # 17. UL RRC MESSAGE TRANSFER(gNB-DU —> gNB-CU-CP) ### 目的 - 將SecurityModeComplete的消息帶給gNB-CU-CP ------------------------------------------------------------------------------------------------ # 18. DL RRC MESSAGE TRANSFER(gNB-CU-CP —> gNB-DU) ### 目的 - 將RRCReconfiguration的消息帶給gNB-DU ------------------------------------------------------------------------------------------------ # 19. RRCReconfiguration(gNB-DU —> UE) ------------------------------------------------------------------------------------------------ # 20. RRCReconfigurationComplete(UE —> gNB-DU) ------------------------------------------------------------------------------------------------ # 21. UL RRC MESSAGE TRANSFER(gNB-DU —> gNB-CU-CP) ------------------------------------------------------------------------------------------------ # 22. INITIAL CONTEXT SETUP RESPONSE (gNB-CU-CP —> AMF) ------------------------------------------------------------------------------------------------

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