lte emm specific procedure

26
EMM - Procedure 2008. 11. 05 Yong Hak, Jung / Onnet Technologies Tel :016-500-8582 E-Mail : [email protected]

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LTE EMM

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Page 1: LTE EMM Specific Procedure

EMM - Procedure

2008. 11. 05

Yong Hak, Jung / Onnet Technologies

Tel :016-500-8582

E-Mail : [email protected]

Page 2: LTE EMM Specific Procedure

2EMM Procedure

차례

Acronyms

EMM Specific Procedure

Attach

Detach

Tracking Area Updating

EMM connection management Procedure

Service request

Paging

EMM STATUS message

Q&A

Page 3: LTE EMM Specific Procedure

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

Page 4: LTE EMM Specific Procedure

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

Page 5: LTE EMM Specific Procedure

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

Page 6: LTE EMM Specific Procedure

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

Page 7: LTE EMM Specific Procedure

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

Page 8: LTE EMM Specific Procedure

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

Page 9: LTE EMM Specific Procedure

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

Page 10: LTE EMM Specific Procedure

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

Page 11: LTE EMM Specific Procedure

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

Page 12: LTE EMM Specific Procedure

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

Page 13: LTE EMM Specific Procedure

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

Page 14: LTE EMM Specific Procedure

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

Page 15: LTE EMM Specific Procedure

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

Page 16: LTE EMM Specific Procedure

16EMM Procedure

EMM Specific Procedure - TAU

Abnormal cases on the network side

Lower layer failure

Protocol error

T3450 timeout

TRACKING AREA UPDATE REQUEST duplicated

Page 17: LTE EMM Specific Procedure

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

Page 18: LTE EMM Specific Procedure

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

Page 19: LTE EMM Specific Procedure

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

Page 20: LTE EMM Specific Procedure

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

Page 21: LTE EMM Specific Procedure

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

Page 22: LTE EMM Specific Procedure

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

Page 23: LTE EMM Specific Procedure

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

Page 24: LTE EMM Specific Procedure

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

Page 25: LTE EMM Specific Procedure

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

Page 26: LTE EMM Specific Procedure

26EMM Procedure

질문

Question & Answer