- Procedure 2008. 11. 05 Yong Hak, Jung / Onnet Technologies Tel :016-500-8582 E-Mail : jyhpan@ont.co.kr
차례 Acronyms Specific Procedure Attach Detach Tracking Area Updating connection management Procedure Service request Paging STATUS message Q&A 2
Acronyms EPC : Evolved Packet Core Network EPS : Evolved Packet System : EPS Mobility Management GUTI : Globally Unique Temporary Identity IMSI : International Mobile Subscriber Identity KSI : Key Set Identifier MME : Mobility Management Entity NAS : Non Access Stratum PDN GW : Packet Data Network Gateway S-TMSI : S-Temporary Mobile Subscriber Identity TAC : Tracking Area Code TAI : Tracking Area Identity TIN : Temporary Identity used in Next Update TMSI : Temporary Mobile Subscriber Identity 3
Specific Procedure - Attach Attach 목적 : packet service 위해 EPC 에 Attach 결과 Context in MME Default bearer Always on IP connectivity IPv4, IPv6 Address UE 에서먼저시작함 4
Specific Procedure - Attach UE Network Start T3410 -REGISTERED-INITIATED Stop T3402, T3411 Valid GUTI 없을경우 IMSI ATTACH REQUEST (PDN CONNECTIVITY REQUEST ) Common Procedure ( identification, authentication, security mode control) Start T3450 Init activation of dedicated bearers IMSI or invalid GUTI => GUTI Allocation Stop T3410 Reset counter TAI list Update List of equivalent PLMN 저장 ATTACH ACCEPT ( ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST, TAI List, List of equivalent PLMNs ) ATTACH COMPLETE ( ACTIVATE DEFAULT EPS BEARER CONTEXT ACCEPT ) Stop T3450 GUTI as valid 라고생각 5
Specific Procedure - Attach UE Network Start T3410 -REGISTERED-INITIATED Stop T3402, T3411 Valid GUTI 없을경우 IMSI ATTACH REQUEST (PDN CONNECTIVITY REQUEST ) Common Procedure ( identification, authentication, security mode control) ATTACH REJECT ( reject cause value ) Stop T3410 Reject cause value 에따른 Action #3 Illegal MS #6 Illegal ME #7 GPRS services not allowed #8 GPRS services and non-gprs services not allowed #11 PLMN not allowed #12 Tracking area not allowed #13 Roaming not allowed in this tracking area #14 GPRS services not allowed in this PLMN #15 No suitable cells in tracking area #19 ESM failure #25 Not authorized for this CSG 6
Specific Procedure - Attach Abnormal cases in the UE Access barred Lower layer failure T3410 timeout ATTACH REJECT Cause code 에따른 Action Change of cell Mobile originated detach Detach procedure collision PDU Transmission failure Attach attempt counter Counter < 5 T3411 Start, -DEREGISTERED.ATTEMPTING-TO-ATTACH, expired Attach restart Counter == 5 Delete GUTI, TAI list, TAI, PLMN list T3402 Start Attach attempt counter 증가 7
Specific Procedure - Attach Abnormal cases on the network side Lower layer failure Protocol error T3450 timeout ATTACH REQUEST duplicated ATTACH REQUEST in -REGISTERED TAU received before ATTACH COMPLETE 8
Specific Procedure - Detach Detach 목적 발생시기 EPS Service detach Disconnect PDN connected Network 가 UE에게더이상필요없는 EPS 라고알리기위해 UE Switch off USIM removed EPS capability Disable 연결되었던 Context Deactivated without Peer to Peer PDU 양쪽모두시작할수있음 9
Specific Procedure - Detach UE Network Start T3421 -DEREGISTERED-INITIATED Switch off? => 5 초간격으로 DETACH REQUEST 보내면서 Switch off 함 DETACH REQUEST ( Detach Type IE = switch off or not, Detach Type IE = EPS detach/ IMSI detach / both ) Deactivate EPS Bearer context -DEREGISTERED Stop T3421 Deactivate EPS Bearer context EPS Service == inactive -DEREGISTERED DETACH ACCEPT Abnormal cases in the UE # Access barred # Lower layer failure # T3421 timeout # Detach procedure collision # Detach and common procedure collision # Change of cell into a new tracking area # Transmission failure 10
Specific Procedure - Detach UE Network Detach Type IE If Reattach required -Deactivate EPS Bearer context -DATACH ACCEPT 전송 --DEREGISTERED -Attach 시작 If Reattach not required - cause code 보고 Action - 규격 58~60 쪽 DETACH REQUEST ( Cause IE, Detach Type IE = reattach required / reattach not required / IMSI detach) DETACH ACCEPT Start T3422 Deactivate EPS Bearer context -DEREGISTERED-INITIATED Stop T3422 -DEREGISTERED Abnormal cases in the UE # Transmission failure Abnormal cases in the network side # T3422 timeout # Lower layer failure # Detach procedure collision # Detach and attach procedure collision # Detach and tracking area updating procedure collision # Detach and service request procedure collision 11
Specific Procedure - TAU Tracking Area Updating S1 mode only 발생목적 Normal : 실제 Tracking Area 를등록하기위해서 Periodic : UE 의 Availability 를 Network 에알리기위해서 Intersystem change : Iu mode / A Gb mode / S101 mode -> S1 mode MME load balancing UE에서먼저시작함 UE 가 -IDLE 모드인경우 radio and S1 bearer 재요청 발생시기 UE가알려지지않은 Tracking Area 에진입시 T3412 expired RRC가 load balancing TAU required 보낼경우 12
Specific Procedure - TAU UE Network Start T3430 Stop T3402, T3411 -TRACKING-AREA- UPDATING-INITIATED 상태변경 If EPS security context => KSI TRACKING AREA UPDATE REQUEST ( EPS bearer context status IE ) Common Procedure ( Authentication, security mode control) Stop T3430 Reset counter -REGISTERED If GUTI => update If PLMS list => update IF GUTI allocated TRACKING AREA UPDATE ACCEPT ( GUTI, TAI List, EPS bearer context status IE, List of equivalent PLMS ) TRACKING AREA UPDATE COMPLETE If CUTI allocated Start T3450 -COMMON-PROCEDURE-INITIATED If EPS bearer context status IE in Request => Deactivate EPS bearer context Stop T3450 GUTI as valid 라고생각 13
Specific Procedure - TAU UE Network Start T3430 Stop T3402, T3411 -TRACKING-AREA- UPDATING-INITIATED 상태변경 If EPS security context => KSI TRACKING AREA UPDATE REQUEST ( EPS bearer context status IE ) Common Procedure ( Authentication, security mode control) Stop T3430 Stop transmission of user data Reject cause value 에따른 Action TRACKING AREA UPDATE REJECT ( reject cause value ) #3 Illegal MS #6 Illegal ME #7 GPRS services not allowed #9 MS identity cannot be derived by the network #10 Implicitly detached #11 PLMN not allowed #12 Tracking area not allowed #13 Roaming not allowed in this tracking area #14 GPRS services not allowed in this PLMN #15 No suitable cells in tracking area #25 Not authorized for this CSG #40 No EPS bearer context activated 14
Specific Procedure - TAU Abnormal cases in the UE Access barred Lower layer failure T3430 timeout TAU REJECT Cause code 에따른 Action Change of cell TAU and detach procedure collision GUTI reallocation procedure collision PDU Transmission failure Tracking Area Updating attempt counter Counter < 5 T3411 Start, expired TAU restart, 상태변경 Counter == 5 T3402 start, delete equivalent PLMN list Tracking Area Updating attempt counter 증가 Stop ongoing transmission user data 15
Specific Procedure - TAU Abnormal cases on the network side Lower layer failure Protocol error T3450 timeout TRACKING AREA UPDATE REQUEST duplicated 16
Connection Management Procedure - Service Request Service Request 목적 발생조건 -IDLE 모드를 -CONNECTED 모드로변환시키기위해사용 Establish Radio and S1 Bearers Network 가 Downlink signal pending 상태일때 UE 가 Uplink signal pending 상태일때 UE 가 IDLE MODE 이고 Data pending 상태일때 UE 가 IDLE MODE 이고 Paging Request 를받을경우 UE 에서시작 17
Connection Management Procedure - Service Request UE Network Start T3417 -SERVICE-REQUEST-INITIATED SERVICE REQUEST Common Procedure ( Authentication ) User plane radio bearer is set up Stop T3417 -REGISTERED 18
Connection Management Procedure - Service Request UE Network Start T3417 -SERVICE-REQUEST-INITIATED SERVICE REQUEST Common Procedure ( Authentication ) SERVICE REJECT Stop T3417 Reject cause value 에따른 Action #3 Illegal MS #6 Illegal ME #7 GPRS services not allowed #9 MS identity cannot be derived by the network #10 Implicitly detached #11 PLMN not allowed #12 Tracking area not allowed #13 Roaming not allowed in this tracking area #15 No suitable cells in tracking area #25 Not authorized for this CSG 19
Connection Management Procedure - Service Request Abnormal cases in the UE Access barred Lower layer failure T3417 timeout SERVICE REJECT Cause code 에따른 Action TAU procedure triggered Power off Procedure collision Dedicated / Default Bearer set up failure PDU Transmission failure 20
Connection Management Procedure - Service Request Abnormal cases on the network side Lower layer failure Protocol error SERVICE REQUEST duplicated ATTACH REQUEST received TAU REQUEST received 21
Connection Management Procedure - Paging Paging 목적 UE 에게 NAS signalling connection 설립을요청하기위해사용 Init mobile terminating CS fallback procedure Network 에서시작 종류 Using S-TMSI : NAS signalling connection Using IMSI : abnormal procedure for error recovery NAS Signalling connection S1 mode 에서 UE 와 MME 사이의 Peer to Peer Connection LTEuu 인터페이스 + S1AP Connection 22
Connection Management Procedure - Paging UE Network Using S-TMSI Lower layer 에게 paging 요청 Start T3413 Paging Indication specific procedure 또는 Service Request 중이라면 Paging 무시아닐경우 SERVICE REQUEST 전송 SERVICE REQUEST Stop T3413 23
Connection Management Procedure - Paging UE Network Using IMSI Lower layer 에게 paging 요청 Start T3413 Paging Indication specific procedure 또는 Service Request 중이라면 Paging 무시 Deactivate EPS bearer context Detach from EPS Delete TAI, GUTI, KSI -DEREGISTERED ATTACH REQUEST Stop T3413 Attach Procedure 진행 24
STATUS message STATUS message 목적 Protocol Data 수신시검출되는 error conditions 을 Report 하기위해서사용 UE 또는 Network 에서시작 Implementation dependent 25
질문 Question & Answer 26