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UE eNodeB new MME 1. Attach Request 2. Attach Request 4. Identity Request 4. Identity Response Old MME/SGSN Serving GW EIR PDN GW PCRF HSS 3. Identification Request 3. Identification Response 5a. Authentication / Security 5b. Identity Request/Response 5b. ME Identity Check 6. Ciphered Options Request 6. Ciphered Options Response (E) 7. Delete Sesion Request 7. Delete Session Response 8. Update Location Request 9. Cancel Location 9. Cancel Location Ack 10. PCEF Initiated IP-CAN 10. Delete Session Request Session Termination 10. Delete Session Response (B) 7. PCEF Initiated IP-CAN Session Termination (A) (F) 11. Update Location Ack 12. Create Session Request 13. Create Session Request 14. PCEF Initiated IP-CAN Session Establishment/Modification 15. Create Session Response 16. Create Session Response 17. Initial Context Setup Request / Attach Accept 18. RRC Connection Reconfiguration 19. RRC Connection Reconfiguration Complete 20. Initial Context Setup Response 21. Direct Transfer 22. Attach Complete First Uplink Data 23. Modify Bearer Request 23a. Modify Bearer Request 23b. Modify Bearer Response (D) 24. Modify Bearer Response First Downlink Data 25. Notify Request 26. Notify Response (C) First Downlink Data (if not handover)
Attach procedure
上图为3GPP中的attach流程图,在上图中attach req是指在RRC connection setup complete携带的attach req,在此之前有RRC建立的过程:
UERRC CONNECTION REQUESTUTRANRRC CONNECTION SETUPRRC CONNECTION SETUP COMPLETE
在测试过程中体现的是终端的流程,先有attach req,由attach req触发RRC connection req,当RRC建立完成时Attach req才发送给网络。
在实际测试过程中看到终端的attach流程顺序是: 1、attach request 2、RRC connection request 3、Msg1:RA 4、Msg2:RAR
5、…….(见RRC建立流程及attach 信令流程)
Attach的几种重要的步骤包括:鉴权、加密、终端能力上报、承载建立。 一般情况下在开机阶段自动完成Attach过程,在测试计划中未配置attach相关设置的时候,测试过程中一般情况没有attach的过程,只有当出现异常,网络侧将终端detach后,才会有attach的过程。
4.2.2.2 Service流程
在IDLE态由业务触发service过程包括终端触发和网络触发两种,流程图分别如下:
UE eNodeB MME Serving GW PDN GW PCRF HSS 1. NAS: Service Request 2. NAS: Service Request 3. Authentication/Security 4. S1-AP: Initial Context Setup Request 5. Radio Bearer Establishment 6. Uplink Data 7. S1-AP: Initial Context Setup Complete 8. Modify Bearer Request 9. Modify Bearer Request (A) 10. PCEF Initiated IP-CAN Session Modification 11. Modify Bearer Response 12. Modify Bearer Response UE triggered Service Request procedure
UE eNodeB RNC/BSC MME SGSN S-GW PDN GW 1. Downlink Data 2a. Downlink Data Notification 2b. Downlink Data Notification Ack 2a. Downlink Data Notification 3a. Paging 3b. Paging 4a. Paging 4b. Paging 5. Service Request Procedure 6a. Stop Paging 6b. Stop Paging Downlink Data E-UTRAN Downlink Data 2G or 3G non DT Downlink Data 3G DT 2b. Downlink Data Notification Ack Network triggered Service Request procedure
与Attach的过程类似,上图中的service req是在RRC建立完成消息携带的Service req,测试中在终端侧看到service过程还包括RRC建立过程。
在service过程中也包括:鉴权、加密、承载建立。与Attach主要的区别在于网络侧已经存储终端能力,终端不需要再上报终端能力,在RB建立过程中,
service只需要建立DRB/SRB2,不再需要建立EPS默认承载。
4.2.3 关键指标
4.2.3.1 RRC连接建立成功率
定义:
RRC连接建立成功率=RRC连接建立成功次数/RRC连接建立尝试次数×100%。 注:
RRC连接建立尝试次数:UE发出的“RRC Connection Request”消息; RRC连接建立成功次数:收到RRC Connection setup complete消息,表示成功。
4.2.3.2 E-RAB建立成功率
定义:
E-RAB建立成功率=(Attach过程E-RAB建立成功次数+Service Request过程E-RAB建立成功次数+承载建立过程E-RAB建立成功次数)/(Attach过程E-RAB请求建立次数+Service Request过程E-RAB请求建立次数+承载建立过程E-RAB请求建立次数)×100%。 注:
E-RAB请求建立:搜索RRC连接重配完成消息,找到后,继续判断其最近上一条RRCConnection Reconfiguration,如果信元MobilityControlInfo不存在,且Radio Resource Config Dedicated的DRB-ToAddModifyList存在,则表示为RRC 重配事件为E-RAB建立请求
E-RAB建立成功:收到RRC Connection Reconfiguration Complete消息
4.2.3.3 无线接通率
定义:
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