合成信令事件流程说明

1．Attach

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

消息类型

RRCConnectionRequest

Attatch Complete

Attach Reject

流程参考

UE建立RRC连接eNodeBMMEMSC/VLRHSSRRC ConnectionSetupCompleteAttach Request/PDN Conne ReqInitial UE messageAttach Request/PDN Conn ReqDownplink/Uplink NAS TransportIdentification Request/Identification ResponseDownplink/Uplink NAS TransportAuthentication/Security AKADiameter：ULR/ULARRC Connection ReconfigurationAttach Accept/Act Def B ReqInitial Context Setup RequestAttach Accept /Act Def B ReqLocation Update Request

Location Update AcceptRRC ConnectionReconfigurationCompleteInitial Context Setup ResponseUL Derect TransferAttach Complete/Act Def B RspUplink NAS TransportAttach Complete/Act Def B Rsp

2．Sevice Request

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

消息类型

RRCConnectionRequest

Initial Context Setup Complete

Sevice Reject

流程参考

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

3．Paging

起止消息

开始消息

结束消息

接口

S1-MME

S1-MME

S1-MME

S1-MME

消息类型

Paging

Sevice Request

Extend Sevice Request

Attach Request

流程参考

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

4．TAU

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

S1-MME

消息类型

RRCConnectionRequest

TAU Complete

TAU Accept

TAU Reject

流程参考

UE

eNodeB

RNC

new MME

1. Trigger to start

TAU procedure

old MME/new Serving old Serving

PDN GWGWGWold S4SGSN

HSS

PCRF2. TAU Request3. TAU Request

4. Context Request

5. Context Response6. Authentication / Security

7. Context Acknowledge

8. Create Session Request

9. Modify Bearer Request

(A)9a. PCEF Initiated IP-CAN

Session Modification

10. Modify Bearer Response11. Create Session Response12. Update Location

13. Cancel Location15. Iu Release Command16. Iu Release Complete

14. Cancel Location Ack17. Update Location Ack

20. TAU Accept

21. TAU Complete

18. Delete Session Request

(B)19. Delete Session Response

Tracking Area Update procedure with Serving GW change

UE

eNodeB

RNC

BSC

MME

Old MME /

Old S4 SGSN

Serving

GW

PDN

PDN

GW

PCRF

HSS

1. Trigger to start TAU

procedure

2. Tracking Area Update Request

3. Tracking Area Update Request

4. Context Request

5. Context Response

6. Authentication / Security

7. Context Acknowledge

9. Modify Bearer Request

10. Modify Bearer Request

11. PCEF Initiated IP-CAN

Session Modification

12. Modify Bearer Response

13. Modify Bearer Response

14. Update Location Request

15. Cancel Location

16. Cancel Location Ack

17. Iu Release Command

18. Iu Release Complete

19. Update Location Ack

20. Tracking Area Update Accept

21. Tracking Area Update Complete

(A)

E-UTRAN Tracking Area Update without S-GW change

UE

RNC/

eNodeB

BSS

SGSN

MME

Serving

GW

Old

SGSN

PDN

GW

PCRF

HSS

1. UE Changes to

UTRAN or GERAN

2a. Routeing Area Update Request

2b. Routeing Area Update Request

3. Context Request

4. Context Response

6. Context Acknowledge

5. Authentication

7. Modify Bearer Request

8. Modify Bearer Request

9. PCEF Initiated IP-CAN

Session Modification

10. Modify Bearer Response

11. Modify Bearer Response

12. Update Location

(A)

13. Cancel Location

13. Cancel Location Ack

14. S1-AP: S1 Release Command

Release E-UTRAN

connection

14. S1-AP: S1 Release Complete

15. Update Location Ack

18. Routeing Area Update Accept

19. Routeing Area Update Complete

20. Service Request

21. RAB Assignment Request

21b. RAB Assignment Response

22. Modify Bearer Request

22b. Modify Bearer Response

Routing Area Update with MME interaction and without S-GW change

RNC/

UE

BSS

eNodeB

SGSN

1. UE Changes to

UTRAN or GERAN

MME

New

Old

Serving

Serving

GW

GW

PDN

GW

Old

SGSN

PCRF

HSS

2a. Routeing Area Update Request

2b. Routeing Area Update Request

3. Context Request

5. Security Functions

4. Context Response

6. Context Acknowledge

7. Create Session Request

8. Modify Bearer Request

9. PCEF Initiated IP-CAN

Session Modification

10. Modify Bearer Response

11. Create Session Response

12. Update Location

(A)

13. Cancel Location

13. Cancel Location Ack

14. S1-AP: S1 Release Command

Release E-UTRAN

connection

14. S1-AP: S1 Release Complete

15. Update Location Ack

16. Delete Session Request

(B)

17. Delete Session Response

18. Routeing Area Update Accept

19. Routeing Area Update Complete

20. Service Request

21. RAB Assignment Request

21b. RAB Assignment Response

22. Modify Bearer Request

22b. Modify Bearer Response

Routing Area Update with MME interaction and with S-GW change

UE

new MME

old MME

MSC/VLR

HSS

1. UE determines to

perform TAU

2. TAU Request

3. Step 4 to step 19 of TAU procedure as specified in TS 23.401

4. Location Update Request

5. Location update in CS domain

6. Location Update Accept

7. TAU Accept

8. TAU Complete

9. Paging Request

5．Detach

起止消息

开始消息

结束消息

接口

UU

S1-MME

S1-MME

Uu

消息类型

RRCConnectionRequest(UE发起)

DetachRequest（网络侧发起）

Detach Accept

RRCConnectionRelease（如存在）

流程参考

UE

BSS/UTRAN

SGSN

MME

Serving GW

PDN GW

PCRF

1. Detach Request

2. Delete Session Request

3. Delete Session Response

4. Detach Notification

5. Delete Session Request

6. Delete Bearer Requ6. Delete Session Request e

st

7. Delete Bearer Response7. Delete Session Response

8. PCEF8. PCEF Initiated IP-CAN

Initiated IP

CAN

Session Termination

(A)

9. Delete Session Response

10. Detach Ack11. Detach Accept

12. Signalling Connection Release

UE

MME

MSC/VLR

HSS

1. Detach Request

2. Step 2 to step 10 of the UE-initiated Detach procedure for E-UTRAN

as specified in TS 23.401

3a. IMSI Detach Indication

3b. EPS Detach Indication

4. Remove SGs

5. Detach Accept

association

6. Step 12 to step 14 of the UE-initiated Detach procedure for E-UTRAN

as specified in TS 23.401

HSS

UE

SGSN MME

MSC/VLR

HSS

1. Step 1 to step 10 of MME-initiated detach as specified in TS 23.401

2a. EPS Detach Indication

2b. IMSI Detach Indication

3. Remove SGs

association

4. Step 11 to step14 of MME-initiated detach as specified in TS 23.401

5. Detach Request

6．PDN connectivity

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

S1-MME

消息类型

RRCConnectionRequest

PDN connectivity Request

PDN connectivity complete

PDN connectivity Reject

流程参考

UE

eNodeB

MME

Serving GW

PDN GW

PCRFHSS

1. PDN Connectivity Request

2. Create Session Request

3. Create Session Request

(A)

4. IP-CAN Session

Establishment/Modification

5. Create Session Response

First Downlink Data

6. Create Session Response

7. Bearer Setup Request / PDN Connectivity Accept

8. RRC Connection Reconfiguration

9. RRC Connection Reconfiguration Complete

10. Bearer Setup Response

11. Direct Transfer

12. PDN Connectivity Complete

First Uplink Data

13. Modify Bearer Request

13.a Modify Bearer request

13.b Modify Bearer response

14. Modify Bearer Response

First Downlink Data

15. Notify Request

16. Notify Response

(B)

7．PDN disconnection

起止消息

开始消息

结束消息

接口

S1-MME

UU接口

S1-MME

S1-MME

消息类型

PDN Disconnection Request

RRCConnectionRequest

PDN connectivity complete

PDN connectivity Reject

流程参考

UE

eNodeB

MME

Serving GW

PDN GW

PCRF

HSS

1a. PDN Disconnection Request

1b PDN disconnection trigger

2. Delete Session Request

3. Delete Session Request

(A)

4. Delete Session Response

5. IP-CAN Session Termination

6. Delete Session Response

7. Deactivate Bearer Request

8. RRC Connection Reconfiguration

9a. RRC Connection Reconfiguration Complete

9b. Deactivate Bearer Response

10a. Direct Transfer

10b. Deactivate EPS Bearer Context Accept

8．EPS bearer resource allocation

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

S1-MME

消息类型

RRCConnectionRequest/Bearer resource allocation

Request

Bearer resource allocation reject

Activate dedicated EPS bearer context accept

Activate dedicated EPS bearer context reject

流程参考

UE

eNodeB

MME

Serving

G

W

PDN

GW

PCRF

1. Bearer resource allocation request

n

2. Bearer Resource Command

3.

Bearer Resource Command

(A)

4. PCEF Initiated IP-CAN

Session Modification, begin

5. Create Bearer Request

6. Create Bearer Request

7. Bearer Setup Request/

Session Management Request/

Activate dedicated EPS bearer context Request

8. RRC Connection Reconfiguration

9. RRC Connection Reconfiguration Complete

10. Bearer Setup Response

11. Direct Transfer/ Activate dedicated EPS bearer context Accept

12. Session Management Response/ Activate dedicated EPS bearer context Accept

13. Create Bearer Response

14. Create Bearer Response

15. PCEF Initiated IP-CAN

Session Modification, end

9．EPS bearer resource modify

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

S1-MME

消息类型

RRCConnectionRequest/Bearer resource modification

Request

Bearer resource modification reject

Activate dedicated EPS bearer context accept

Activate dedicated EPS bearer context reject

流程参考

UE

eNodeB

MME

Serving

G

W

PDN

GW

PCRF

1. Bearer resource modification request

2. Bearer Resource Command

3.

Bearer Resource Command

(A)

4. PCEF Initiated IP-CAN

Session Modification, begin

5. Create Bearer Request

6. Create Bearer Request

7. Bearer Setup Request/

Session Management Request/

Activate dedicated EPS bearer context Request

8. RRC Connection Reconfiguration

9. RRC Connection Reconfiguration Complete

10. Bearer Setup Response

11. Direct Transfer/ Activate dedicated EPS bearer context Accept

12. Session Management Response/ Activate dedicated EPS bearer context Accept

13. Create Bearer Response

14. Create Bearer Response

15. PCEF Initiated IP-CAN

Session Modification, end

10．EPS bearer context deactivation

起止消息

开始消息

结束消息

接口

UU接口

S1-MME

S1-MME

消息类型

Deactivate EPS bearer context Request

Deactivate EPS bearer context Request

Deactivate EPS bearer context accept

流程参考

UE

eNodeB

Serving GW

PDN GW

PCRF

HSS

MMESGSN

(A)

1. IP-CAN Session

Modification

2. Delete Bearer Request

3a. Delete Bearer Request

4a. Detach Request

3b. Delete Bearer Request

4b. Deactivate Bearer Request

5. RRC Connection Reconfiguration

6a. RRC Connection Reconfiguration complete

6b. Deactivate Bearer Response

7a. Direct Transfer

7b. Deactivate EPS Bearer Context Accept

7c. Detach Accept

8a. Delete Bearer Response

8b. Delete Bearer Response

9. Delete Bearer Response10. IP-CAN Session

Modification

11. Signalling Connection Release

(B)

11．EPS bearer context modification

起止消息

接口 消息类型

开始消息

S1-MME

Modify EPS bearer context Request

结束消息

S1-MME

Modify EPS bearer context accept

S1-MME

Modify EPS bearer context reject

流程参考

UE

eNodeB

MME

Serving GW

(A)

PDN GW

PCRF

1. IP-CAN Session

Modification

2. Update Bearer request

3. Update Bearer Request

4. Bearer Modify Request/

Session Management Request

5. RRC Connection Reconfiguration

6. RRC Connection Reconfiguration Complete

7. Bearer Modify Response

8. Direct Transfer

9. Session Management Response

10. Update Bearer Response

11. Update Bearer response

12. IP-CAN Session

Modification

(B)

12．Dedicated EPS bearer context activation

起止消息

开始消息

结束消息

接口

S1-MME

S1-MME

S1-MME

消息类型

Activate dedicated EPS bearer context Request

Activate dedicated EPS bearer context accept

Activate dedicated EPS bearer context reject

流程参考

UE

eNodeB

MME

Serving GW

(A)

PDN GW

PCRF

1. IP-CAN Session

Modification

2. Create Bearer Request

3. Create Bearer Request

4. Bearer Setup Request/

Session Management Request/ Activate dedicated EPS bearer context Request

5. RRC Connection Reconfiguration

6. RRC Connection Reconfiguration Complete

7. Bearer Setup Response

8. Direct Transfer

9. Session Management Response/ Activate dedicated EPS bearer context accept

10. Create Bearer Response

11. Create Bearer Response

12. IP-CAN Session

Modification

(B)

13．X2 handover

起止消息

开始消息

结束消息

接口

X2接口

X2接口

X2接口

消息类型

Handover Request

UE Context Release

Handover Prepation Failure

备注

流程参考

UE Context Release

14．S1 handover

起止消息

开始消息

结束消息

接口

S1-MME接口

S1-MME接口

S1-MME接口

消息类型

Handover Required

Handover Notify

备注

Handover Failure/Handover

Prepation Failure

流程参考

UE

Source

eNodeB

Source

Target

MME

eNodeB

Downlink User Plane data

Target

MME

Source

Serving GW

Target Serving

GW

PDN GW HSS

1. Decision to trigger a

relocation via S1

2. Handover Required

3. Forward Relocation Request

4. Create Session Request

4a. Create Session Response

5. Handover Request

5a. Handover Request Acknowledge

6. Create Indirect Data Forwarding Tunnel Request

6a. Create Indirect Data Forwarding Tunnel Response

7. Forward Relocation Response

.

8. Create Indirect Data Forwarding Tunnel Request

8a. Create Indirect Data Forwarding Tunnel Response

9. Handover Command

9a. Handover Command

10. eNB Status Transfer

10a. Forward Access Context Notification

10b. Forward Access Context Acknowledge

10c. eNB Status Transfer

11a. Only for Direct forwarding of data

11b. Only for Indirect forwarding of data

Detach from old cell and

synchronize to new cell

12. Handover Confirm

Downlink data

Uplink User Plane data

13. Handover Notify

14. Forward Relocation Complete Notification

14b. Forward Relocation Complete Acknowledge

15. Modify Bearer Request

16. Modify Bearer Request

17. Modify Bearer Response

Downlink User Plane data

18. Tracking Area Update procedure

19c. Delete Session Request

(B)

19b. UE Context Release Complete

19d. Delete Session Response

20a. Delete Indirect Data Forwarding Tunnel Request

20b. Delete Indirect Data Forwarding Tunnel Response

21a. Delete Indirect Data Forwarding Tunnel Request

21b. Delete Indirect Data Forwarding Tunnel Response

19a. UE Context Release Command

(A)

16a. Modify Bearer Response

15．UE Context Release

起止消息

开始消息

结束消息

接口

S1-MME接口

S1-MME接口

S1-MME接口

消息类型

UEContextRelease Request

UEContextRelease Command

UEContextRelease Command Complete

备注

流程参考

16．EPS bearer Release

起止消息

开始消息

结束消息

接口

S1-MME

UU接口

S1-MME

S1-MME

消息类型

E-RAB Release Command

RRCConnectionRequest

E-RAB Release Complete

E-RAB Release Indication

备注

流程参考

a) E-RAB Release procedure

UEeNB

MMES1-AP: E-RAB RELEASE COMMANDRRC: Radio Bearer ReleaseE-RAB To Be Released List: E-RAB ID, CauseS1-AP: E-RAB RELEASE COMPLETEE-RAB Release List: E-RAB IDE-RAB Failed To Release List: E-RAB ID, Cause

b) E-RAB Release Indication procedure

UEeNB

MMERRC: Radio Bearer ReleaseS1-AP: E-RAB RELEASE INDICATIONE-RAB Released List: E-RAB ID, Cause

17．CSFB

起止消息

开始消息

结束消息

接口

UU接口

SGS接口

SGS接口

S1-MME

S1-MME

消息类型

RRCConnectionRequest

Paging Request

Paging Reject

UE CONTEXT RELEASE COMPLETE

Sevice Reject

备注

主叫

被叫

流程参考

主叫：

UE/MS

eNodeB

BSS/RNS

MME

MSC

SGSN

Serving

GW

P-GW/

GGSN

1a. Extended Service Request

1b. S1-AP Request message with CS Fallback indicator

1c. S1-AP Response message

2. Optional Measurement Report Solicitation

3a. PS HO as specified in 23.401 [2] (preparation phase and start of execution phase)

3b. Suspend

3c. Update Bearer(s)

4a. Location Area Update

4b. CM Service Request

4b. A/Iu-cs message (with CM Service Request)

5. CM Service Reject 5. CM Service Reject

If the MSC

is changed

Location Area Update or Combined RA/LA Update

6. CS call establishment procedure

7. PS HO as specified in 23.401 [2] (continuation of execution phase)

CS Call Request in E-UTRAN, Call in GERAN/UTRAN

UE/

MS

eNodeB

BSS

/RNS

MME

MSC

SGW/PGW

SGSN

1a. NAS Extended Service Request

1b. S1

-

AP UE Context Modification Request with CS Fallback indicator

1c. S1

-

AP UE Context Modification Response message

2. Optional Measurement Report Solicitation

. NACC

3b, 3c

RRC connection release

3

a

,

.

4. S1

AP: S1 UE Context Release

Request

-

5. S1 UE Context Release

6. UE changes RAT then LA Update or RA Update or LAU and RAU

a. Suspend (see 23.060)

7

7b. Suspend Request / Response

. Update bearer(s)

8

9. CM Service Request

10a. Service Reject

10b. Location Area Update

10c. CS MO call

If the

MSC

is changed

9. A/Iu-cs message (with CM Service Request)

11. Routing Area Update or Combined RA/LA Update

CS Call Request in E-UTRAN, Call in GERAN/UTRAN without PS HO

UE

/M

S

E

-

UTRAN

MME

BSS

/

RNS

1.

UE is c

ombined EPS

/I

MSI Attached

2

. U

E decision to perform

MO CSFB c

all

or accept a

CS domain page message

3.

E

xtended S

ervice Request

4.

Service Reject

5. UE Selects .

GERAN/

UTRAN

CS Domain

6.

S

1 U

E Context R

elease

Command

7.

E-

U

TRAN triggers RRC

connection release

8.

S

1 U

E Context Release

Complete

CSFB MO or MT call, rejected by MME

被叫：

UE

eNodeB

MME

RNC/BSC

MSC

VLR

HSS

G-MSC

1. IAM

2. SRI procedure in TS 23.018

3. IAM

4. Paging Request

6. Paging

5. Paging

7a. Extended Service Request

7a. Service Request

7b. Initial UE Context Setup

8. After the UE context setup the procedure continues as described the active

mode mobile terminated call procedures described in Clause 7.3 and 7.4.

If the eNodeB knows that PS HO is supported the procedure in clause 7.3 “Mobile

Terminating call in Active Mode - PS HO supported” may be applied from step 2, in

Clause 7.3, and onwards

If the eNodeB knows that PS HO is not supported the procedure in clause 7.4

“Mobile Terminating call in Active Mode – No PS HO support” shall be applied from

step 2 in Clause 7.4, and onwards

MSC

S

-G

W

/

P

-G

W

18．SMS

起止消息

开始消息

结束消息

接口

UU接口

SGS接口

UU接口

SGS接口

消息类型

ULInformationTransfer

Downlink Unitdata

DLInformationTransfer

Uplink Unitdata

备注

上行

下行

上行

下行

流程参考

上行方向：

UEeNBMMEMSCULInformationTransferUplink NAS TransportUplink UnitdataDownlink Unitdata(ACK or ERROR)Downlink NAS TransportDLInformationTransfer

下行方向

UEeNBMMEMSCDownlink UnitdataDownlink NAS TransportDLInformationTransferULInformationTransfer(ACK or Error)Uplink NAS TransportUplink Unitdata

er

起止消息

接口 消息类型

REGISTER（expires>0）

200OK（REGISTER）

4XX-6XX错误码（401-407除外）

备注

上行

下行

下行

开始消息 Gm/Mw接口

结束消息 Gm/Mw接口

Gm/Mw接口

流程参考

UE/PGWPCSCF/ATCFICSCF/SCSCFSCCAS/TASHSSREGSITERREGSITERUARUAAMARMAA401401REGSITERREGSITERUARUAASARSAA200OK200OK

20.3rd-Register

起止消息

接口 消息类型

REGISTER（expires>0）

200OK（REGISTER）

4XX-6XX错误码

备注

上行

下行

下行

开始消息 ISC接口

结束消息 ISC接口

ISC接口

流程参考

UE/PGWPCSCF/ATCFICSCF/SCSCFSCCAS/TASHSSREGSITERREGSITERUARUAAMARMAA401401REGSITERREGSITERUARUAASAR200OK200OKSAAREGSITER200OKMESSAGE200OK

（红框部分为业务过程）

ster

起止消息

接口 消息类型

REGISTER（expires=0）

200OK（REGISTER）

4XX-6XX错误码（401-407除外）

备注

上行

下行

下行

开始消息 Gm/Mw接口

结束消息 Gm/Mw接口

Gm/Mw接口

流程参考

UE/PGWPCSCF/ATCFICSCF/SCSCFSCCAS/TASHSSREGSITERREGSITERUARUAAMARMAA401401REGSITERREGSITERUARUAASAR200OK200OKSAA

（红框部分为可选部分）

22.3rd-Deregister

起止消息

接口 消息类型

REGISTER（expires=0）

200OK（REGISTER）

4XX-6XX错误码

备注

上行

下行

下行

开始消息 ISC接口

结束消息 ISC接口

ISC接口

流程参考

UE/PGWPCSCF/ATCFICSCF/SCSCFSCCAS/TASHSSREGSITERREGSITERUARUAAMARMAA401401REGSITERREGSITERUARUAASAR200OK200OKSAAREGSITER200OK

（红框部分为业务过程）

g

起止消息

接口

Nc接口

消息类型

INVITE

IAM

200OK（BYE）

RLC

备注

上行

关口局->

MGCF方向

下行

MGCF->

关口局方向

开始消息 Gm/Mw/ISC接口

结束消息 Gm/Mw/ISC接口

Nc接口

Gm/Mw/ISC接口 4XX-6XX错误码(针对于INVTE的响应)下行

或主叫侧发起的CANCEL请求

流程参考

VoLTE用户呼叫VoLTE用户，主被叫均附着在LTE（precondition）

UE(O)MME(O)SAE GW(O)PCRF(O)VoLTE

SBC(O)I/S-CSCF(O)MMTel

AS(O)MMTel

AS(T)HSS(T)I/S-CSCF(T)VoLTE

SBC(T)PCRF(T)SAE GW(T)MME(T)UE(T)

bearer

bearer

7.空口流程

bearer

bearer

response33.空口流程/200

bear request49.空口流程

bear

51a. PCC流程，参见44~50步60.200 OK61.200 OK62.200 OK63.200 OK64.200 OK65.200 OK66.200 OK67.200 OK60a. PCC流程，参见28~34步67a. PCC流程，参见44~50步68.200 OK70.180 Ringing71.200 OK/ACK通话建立

bear request80.空口流程69.被叫振铃

bear

response89.200 OK86. Delete

bearer

bearer

response89.空口流程

VoLTE用户呼叫VoLTE用户，主叫附着在LTE，被叫附着在2/3G

UE(O)MME(O)S/P-GW(O)1. INVITE2. AAR3. RAR4. RAA6. Create bearer request5. AAAPCRF(O)SBC(O)S-CSCF(O)AS(O)AS(T)HSS(T)I/S-CSCF(T)MGCF(T)VMSC(T)7. 空口流程8. Create bearer response9. CCR-U10. CCA-U11. RAR12. RAA13. INVITE14. INVITE15. INVITE16. INVITE17. 19. 21. INVITE22. UDR23. UDA24. UDR24a. PRN24b. PRN ACK25. UDA26. INVITE27. INVITE28. IAM29. APM32. 18333. 18334. 18335. 18336. 18337. 18338. 18339. AAR40. RAR41. RAA43. Update bearer request42. AAA30. APM31. ACM44. 空口流程45. Update bearer response46. 18347. UPDATE48. UPDATE47a. PCC流程，参见39~45步49. UPDATE50. UPDATE51. UPDATE52. UPDATE53. UPDATE54. UPDATE55. 200 OK56. 200 OK57. 200 OK58. 200 OK59. 200 OK61. 200 OK60. 200 OK63. COT64. CPG(Alerting)65. 180 Ringing66a. 200 OK/ACK66. ANM61a. PCC流程，参见39~45步62. 200 OK通话建立67. BYE68. STR69. RAR70. RAA72. Delete bearer request71. STA73. 空口流程74. Delete bearer response75. BYE76. REL77. RLC78. 200 OK

VoLTE用户呼叫VoLTE用户，主叫附着在2/3G，被叫附着在LTE

VMSC(O)MGCF(T)1. SRI2. SRI ACK3. IDP4. CONNECT5. IAM6. INVITE7. LIR8. LIA9. INVITE10. UDR11. IDR12. IDA13. UDA14. INVITE15. INVITEAS(T)HSS(T)I/S-CSCF(T)SBC(T)PCRF(T)S/P-GW(T)MME(T)UE(T)A16. AAR17. RAR18. RAA19. AAA20. Create bearer request21. 空口流程22. Create bearer response23. INVITE24. 18325. AAR26. RAR27. RAA28. AAA29. Create/Update bearer request30. 空口流程32. 18333. 18334. 18335. 18336. APM37. APM31. Create/Update bearer responseB37a. UPDATE37b. 200 OK37c. PCC流程，参见25~31步38. 180 Ringing39. ACM(Alerting)40. 200 OK/ACK41. ANM通话建立42. REL43. BYE44. BYE45. STR46. RAR47. RAA48. STA49. Delete bearer request50. 空口流程51. Delete bearer response52. 200 OK53. 200 OK54. RLC

其中A为被叫SBC向PCC预申请通话资源，为可选流程。B仅在MGCF要求被叫UE侧对资源预留进行确认时必选。

VoLTE用户呼叫VoLTE用户，主被叫均附着在2/3G

VMSC(O)MGCF(T)1. SRI2. SRI ACK3. IDPAS(T)HSS(T)I/S-CSCF(T)MGCF(T)VMSC(T)4. CONNECT5. IAM6. INVITE7. LIR8. LIA9. INVITE10. UDR11. UDA12. UDR13. PRN14. PRN ACK15. UDA16. INVITE17. INVITE18. IAM19. APM20. APM21. 18322. 18323. 18324. 18325. APM26. APM28. 180 Ringing29. ACM31. 200 OK/ACK32. ANM30. ANM27. ACM通话建立33. REL34. BYE35. REL36. RLC37. BYE38. RLC

24. INVITE from eMSC

起止消息

接口

Gm/Mw/ISC/I2/接口

结束消息 Gm/Mw/ISC/I2接口

Sv接口

Gm/Mw/ISC/I2接口

Sv接口

消息类型

PS to CS REQ

INVITE

BYE (Normal & Mid-call eSRVCC)

503(Altering eSRVCC)

PS to CS HO complete ack

4XX-6XX错误码(针对于INVTE的响应)或主叫侧发起的CANCEL请求

备注

上行

上行

下行

上行

下行

开始消息 Sv接口

PS to CS RSP（case不为Request 下行

accepted）

PS_TO_CS_CANCEL_NTF

上行

流程参考

稳态下的eSRVCC

UE AeNB/MMEMSC/SRVCCIWFINVITE(Feature-Caps: mid-call) optionalATCF / PINVITEI/SCSCFSCCASUE BINVITEINVITEINVITE180/183183/180(Feature-Caps: srvcc)

180/183180/183200200Contact: ;+-call optional200200通话MediaMedia测量报告PS to CS HO reqTarget Cell id ; STNSR，C-MSISDN准备资源（同CS切换）PS to CS HO rspHO CMDINVITE

（STNSR，C-MSISDN）200HO comleteCS mediaPS to CS HO completePS to CS HO complete ackMediaINVITE

（ATU-STI，C-MSISDN）MediaINVITE

（ATU-STI，C-MSISDN）200200挂机、释放

Alerting情况下的eSRVCC

UE_AeNodeB/MMESRVCC IWFHLRP-CSCF /

ATCFI/S-CSCFSCC ASUE_BUE_A呼叫UE_B，UE_B处于振铃态媒体资源通过PS网络承载1.上报系统测量报告 to CS

Request申请承载资源er

to CS

to CS

Complete to CS

Complete (STN-SR,C-MSISDN,-alerting)(ATU-STI,C-MSISDN,-alerting)(ATU-STI,C-MSISDN,-alerting)CS网络位置更新CS网络承载PS网络承载12.183(SDP)11.183(SDP)10.183(SDP)18.200 (PRACK)(XML package)CS Call Delivered21. 200

(INFO)17.200 (PRACK)16.200 (PRACK)(XML package)22. 200

(INFO)24.200(INVITE)T ACK27.200(INVITE)30. ACK26.200(INVITE)25.200(INVITE)31. ACK32. ACK34. CANCEL37.200(CANCEL)40.503(INVITE)39.487(INVITE)35. CANCEL36.200(CANCEL)38.487(INVITE)释放切换前会话承载资源

E(SRVCC)

起止消息

接口 消息类型

MESSAGE

200OK（MESSAGE）

4XX-6XX错误码

备注

上行

下行

下行

开始消息 Mw/ISC接口

结束消息 Mw/ISC接口

Mw/ISC接口

流程参考

UE/PGWPCSCF/ATCFICSCF/SCSCFSCCAS/TASHSSREGSITERREGSITERUARUAAMARMAA401401REGSITERREGSITERUARUAASARSAA200OK200OKREGSITER200OKMESSAGE200OK

（红框部分为业务过程）

起止消息

接口 消息类型

OPTION

200OK（OPTION）

4XX-6XX错误码

备注

上行

下行

下行

开始消息 Gm/Mw/Mi/Mj/Mg/ISC/I2接口

结束消息 Gm/Mw/Mi/Mj/Mg/ISC/I2接口

Gm/Mw/Mi/Mj/Mg/ISC/I2接口

流程参考

查询端被查询端OPTION200OK