lte emm specific procedure
DESCRIPTION
LTE EMMTRANSCRIPT
EMM - Procedure
2008. 11. 05
Yong Hak, Jung / Onnet Technologies
Tel :016-500-8582
E-Mail : [email protected]
2EMM Procedure
차례
Acronyms
EMM Specific Procedure
Attach
Detach
Tracking Area Updating
EMM connection management Procedure
Service request
Paging
EMM STATUS message
Q&A
3EMM Procedure
Acronyms
EPC : Evolved Packet Core Network
EPS : Evolved Packet System
EMM : 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
4EMM Procedure
EMM Specific Procedure - Attach
Attach
목적 : packet service 위해 EPC 에 Attach
결과
Context in MME
Default bearer
Always on IP connectivity
IPv4, IPv6 Address
UE에서 먼저 시작함
5EMM Procedure
EMM Specific Procedure - Attach
Network
EMMUE
EMM
ATTACH REQUEST
(PDN CONNECTIVITY REQUEST )
ATTACH ACCEPT
( ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST,
TAI List, List of equivalent PLMNs )
ATTACH COMPLETE
( ACTIVATE DEFAULT EPS BEARER CONTEXT ACCEPT )
Start T3410
EMM-REGISTERED-INITIATED
Stop T3402, T3411
Valid GUTI 없을 경우 IMSI
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
Stop T3450
GUTI as valid 라고 생각
6EMM Procedure
EMM Specific Procedure - Attach
Network
EMMUE
EMM
ATTACH REQUEST
(PDN CONNECTIVITY REQUEST )
ATTACH REJECT
( reject cause value )
Start T3410
EMM-REGISTERED-INITIATED
Stop T3402, T3411
Valid GUTI 없을 경우 IMSI
Common Procedure
( identification, authentication, security mode control)
#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
Stop T3410
Reject cause value 에 따른 Action
7EMM Procedure
EMM Specific Procedure - Attach
Abnormal cases in the UE
Access barred
Lower layer failure
T3410 timeout
ATTACH REJECT
Cause code 에 따른 Action
Change of cell
Mobile originated detach
Detach procedure collision
PDU Transmission failure
Attach attempt counter
Counter < 5
T3411 Start, EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH, expired Attach restart
Counter == 5
Delete GUTI, TAI list, TAI, PLMN list
T3402 Start
Attach attempt counter 증가
8EMM Procedure
EMM Specific Procedure - Attach
Abnormal cases on the network side
Lower layer failure
Protocol error
T3450 timeout
ATTACH REQUEST duplicated
ATTACH REQUEST in EMM-REGISTERED
TAU received before ATTACH COMPLETE
9EMM Procedure
EMM Specific Procedure - Detach
Detach
목적
EPS Service detach
Disconnect PDN connected
Network 가 UE에게 더 이상 필요 없는 EPS 라고 알리기 위해
발생시기
UE Switch off
USIM removed
EPS capability Disable
연결 되었던 Context
Deactivated without Peer to Peer PDU
양쪽 모두 시작할 수 있음
10EMM Procedure
EMM Specific Procedure - Detach
Network
EMMUE
EMM
DETACH REQUEST
( Detach Type IE = switch off or not,
Detach Type IE = EPS detach/ IMSI detach / both )
DETACH ACCEPT
Start T3421
EMM-DEREGISTERED-INITIATED
Switch off ? => 5초 간격으로DETACH REQUEST 보내면서
Switch off 함 Deactivate EPS Bearer context
EMM-DEREGISTERED
Stop T3421
Deactivate EPS Bearer context
EPS Service == inactive
EMM-DEREGISTERED
Abnormal cases in the UE
# Access barred
# Lower layer failure
# T3421 timeout
# Detach procedure collision
# Detach and EMM common procedure collision
# Change of cell into a new tracking area
# Transmission failure
11EMM Procedure
EMM Specific Procedure - Detach
Network
EMMUE
EMM
DETACH REQUEST
( EMM Cause IE,
Detach Type IE = reattach required / reattach not required / IMSI detach)
DETACH ACCEPT
Detach Type IE
If Reattach required
-Deactivate EPS Bearer context
-DATACH ACCEPT 전송-EMM-DEREGISTERED
-Attach 시작
If Reattach not required
- EMM cause code 보고 Action
- 규격 58~60쪽
Start T3422
Deactivate EPS Bearer context
EMM-DEREGISTERED-INITIATED
Stop T3422
EMM-DEREGISTERED
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
Abnormal cases in the UE
# Transmission failure
12EMM Procedure
EMM Specific Procedure - TAU
Tracking Area Updating
S1 mode only
발생목적
Normal : 실제 Tracking Area 를 등록하기 위해서
Periodic : UE 의 Availability 를 Network 에 알리기 위해서
Intersystem change : Iu mode / A Gb mode / S101 mode -> S1 mode
MME load balancing
UE에서 먼저 시작함
UE 가 EMM-IDLE 모드인 경우 radio and S1 bearer 재요청
발생시기
UE가 알려지지 않은 Tracking Area 에 진입시
T3412 expired
RRC가 “load balancing TAU required” 보낼 경우
13EMM Procedure
EMM Specific Procedure - TAU
Network
EMMUE
EMM
TRACKING AREA UPDATE REQUEST
( EPS bearer context status IE )
TRACKING AREA UPDATE ACCEPT
( GUTI, TAI List
, EPS bearer context status IE,
List of equivalent PLMS )
TRACKING AREA UPDATE COMPLETE
Start T3430
Stop T3402, T3411
EMM-TRACKING-AREA-
UPDATING-INITIATED 상태 변경If EPS security context => KSI
Common Procedure
( Authentication, security mode control)
If CUTI allocated Start T3450
EMM-COMMON-PROCEDURE-INITIATED
If EPS bearer context status IE in Request
=> Deactivate EPS bearer contextStop T3430
Reset counter
EMM-REGISTERED
If GUTI => update
If PLMS list => update
Stop T3450
GUTI as valid 라고 생각
IF GUTI allocated
14EMM Procedure
EMM Specific Procedure - TAU
Network
EMMUE
EMM
TRACKING AREA UPDATE REQUEST
( EPS bearer context status IE )
TRACKING AREA UPDATE REJECT
( reject cause value )
Start T3430
Stop T3402, T3411
EMM-TRACKING-AREA-
UPDATING-INITIATED 상태 변경If EPS security context => KSI
Common Procedure
( Authentication, security mode control)
#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
Stop T3430
Stop transmission of user data
Reject cause value 에 따른 Action
15EMM Procedure
EMM Specific Procedure - TAU
Abnormal cases in the UE
Access barred
Lower layer failure
T3430 timeout
TAU REJECT
Cause code 에 따른 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, 상태 변경
Counter == 5
T3402 start, delete equivalent PLMN list
Stop ongoing transmission user data
Tracking Area Updating attempt counter 증가
16EMM Procedure
EMM Specific Procedure - TAU
Abnormal cases on the network side
Lower layer failure
Protocol error
T3450 timeout
TRACKING AREA UPDATE REQUEST duplicated
17EMM Procedure
EMM Connection Management Procedure- Service Request
Service Request
목적
EMM-IDLE 모드를 EMM-CONNECTED 모드로 변환시키기 위해 사용
Establish Radio and S1 Bearers
발생조건
Network 가 Downlink signal pending 상태일 때
UE 가 Uplink signal pending 상태일 때
UE 가 IDLE MODE 이고 Data pending 상태일 때
UE 가 IDLE MODE 이고 Paging Request 를 받을 경우
UE 에서 시작
18EMM Procedure
EMM Connection Management Procedure- Service Request
Network
EMMUE
EMM
SERVICE REQUEST
User plane radio bearer is set up
Start T3417
EMM-SERVICE-REQUEST-INITIATED
Common Procedure
( Authentication )
Stop T3417
EMM-REGISTERED
19EMM Procedure
EMM Connection Management Procedure- Service Request
Network
EMMUE
EMM
SERVICE REQUEST
SERVICE REJECT
Start T3417
EMM-SERVICE-REQUEST-INITIATED
Common Procedure
( Authentication )
Stop T3417
Reject cause value 에 따른 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
20EMM Procedure
EMM Connection Management Procedure- Service Request
Abnormal cases in the UE
Access barred
Lower layer failure
T3417 timeout
SERVICE REJECT
Cause code 에 따른 Action
TAU procedure triggered
Power off
Procedure collision
Dedicated / Default Bearer set up failure
PDU Transmission failure
21EMM Procedure
EMM 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
22EMM Procedure
EMM Connection Management Procedure- Paging
Paging
목적
UE에게 NAS signalling connection 설립을 요청하기 위해 사용
Init mobile terminating CS fallback procedure
Network 에서 시작
종류
Using S-TMSI : NAS signalling connection
Using IMSI : abnormal procedure for error recovery
NAS Signalling connection
S1 mode 에서 UE와 MME 사이의 Peer to Peer Connection
LTEuu 인터페이스 + S1AP Connection
23EMM Procedure
EMM Connection Management Procedure- Paging
Network
EMMUE
EMM
SERVICE REQUEST
Paging Indication
Lower layer 에게 paging 요청Start T3413
Stop T3413
EMM specific procedure 또는Service Request 중이라면
Paging 무시아닐 경우 SERVICE REQUEST 전송
Using S-TMSI
24EMM Procedure
EMM Connection Management Procedure- Paging
Network
EMMUE
EMM
ATTACH REQUEST
Paging Indication
Lower layer 에게 paging 요청Start T3413
Stop T3413
Attach Procedure 진행
EMM specific procedure 또는Service Request 중이라면
Paging 무시Deactivate EPS bearer context
Detach from EPS
Delete TAI, GUTI, KSI
EMM-DEREGISTERED
Using IMSI
25EMM Procedure
EMM STATUS message
EMM STATUS message
목적
EMM Protocol Data 수신 시 검출되는 error conditions 을 Report 하기 위해서 사용
UE 또는 Network 에서 시작
Implementation dependent
26EMM Procedure
질문
Question & Answer