EMM - Procedure

2008. 11. 05

Yong Hak, Jung / Onnet Technologies

Tel :016-500-8582

E-Mail : jyhpan@ont.co.kr

2EMM Procedure

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

: packet service EPC Attach

Context in MME

Default bearer

Always on IP connectivity

IPv4, IPv6 Address

UE

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 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

Stop T3450

GUTI as valid

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 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 Action

7EMM Procedure

EMM Specific Procedure - Attach

Abnormal cases in the UE

Access barred

Lower layer failure

T3410 timeout

ATTACH REJECT

Cause code 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

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

EPS Service detach

Disconnect PDN connected

Network UE EPS

UE Switch off

USIM removed

EPS capability Disable

Context

Deactivated without Peer to Peer PDU

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 ? => 5 DETACH REQUEST

Switch off Deactivate EPS Bearer contextEMM-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 -EMM-DEREGISTERED

-Attach

If Reattach not required

- EMM cause code Action- 58~60

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

Normal : Tracking Area

Periodic : UE Availability Network

Intersystem change : Iu mode / A Gb mode / S101 mode -> S1 mode

MME load balancing

UE

UE EMM-IDLE radio and S1 bearer

UE Tracking Area

T3412 expired

RRC load balancing TAU required

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 If 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

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 If 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 Action

15EMM Procedure

EMM Specific Procedure - TAU

Abnormal cases in the UE

Access barred

Lower layer failure

T3430 timeout

TAU REJECT

Cause code 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,

Counter == 5

T3402 start, delete equivalent PLMN list

Stop ongoing transmission user data

Tracking Area Updating attempt counter

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

EMM-IDLE EMM-CONNECTED

Establish Radio and S1 Bearers

Network Downlink signal pending

UE Uplink signal pending

UE IDLE MODE Data pending

UE IDLE MODE Paging Request

UE

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 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 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

UE NAS signalling connection

Init mobile terminating CS fallback procedure

Network

Using S-TMSI : NAS signalling connection

Using IMSI : abnormal procedure for error recovery

NAS Signalling connection

S1 mode UE MME Peer to Peer Connection

LTEuu + S1AP Connection

23EMM Procedure

EMM Connection Management Procedure- Paging

Network

EMMUE

EMM

SERVICE REQUEST

Paging Indication

Lower layer paging Start T3413

Stop T3413

EMM specific procedure Service Request

Paging SERVICE REQUEST

Using S-TMSI

24EMM Procedure

EMM Connection Management Procedure- Paging

Network

EMMUE

EMM

ATTACH REQUEST

Paging Indication

Lower layer paging Start T3413

Stop T3413

Attach Procedure

EMM specific procedure Service Request

Paging Deactivate EPS bearer context

Detach from EPS

Delete TAI, GUTI, KSI

EMM-DEREGISTERED

Using IMSI

25EMM Procedure

EMM STATUS message

EMM STATUS message

EMM Protocol Data error conditions Report

UE Network

Implementation dependent

26EMM Procedure

Question & Answer