gsm-call-flow
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Location Update (LU)
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Introduction (LU)
There are three different types of Location updating. The difference inSignaling between these three types is a parameter in the Location UpdatingRequest Message.
The three types are: Normal: used when an MS reaches a new location area; also called
Forced Registration Periodic: used to prevent mobiles from becoming accidentally detached
from the system Attach: used when a mobile is switched on
The steps involve in a location update are RR connection establishment,service request, Authentication (except for periodic registration), cipheringmode setting, location updating and RR connection release.
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
RR Connection Establishment (LU)MS BTS BSC
Channel Required
Channel Activation Acknowledge
Channel Activation
Imm Ass Command
Imm AssignmentRR(AGCH)
Channel RequestRR(RACH)
Click on Imm AssignmentFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Service Request (LU)MS BTS BSC MSC
SABM
Est Ind(CM_Ser_Req)
UA
Conn Request
Conn Confirmed
Click on Conn ConfirmedFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Authentication (LU)
Click on Auth ResponseFor more information
MS BTS BSC MSC
Auth Request
Auth ReqMM(SDCCH)
DR (Auth Req)
DI (Auth Resp)
Auth Response
Auth RespMM(SDCCH)
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Ciphering (LU)
Click on Ciph Mode ComFor more information
MS BTS BSC MSC
Ciph Mode Cmd
Ciph Mode Command
RR(SDCCH)
Encryption Cmd
DI (Ciph Mode Com)
Ciph Mode Com
Ciph Mode Complete
RR(SDCCH)
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Update Location (LU)
Click on TMSI Real ComFor more information
MS BTS BSC MSC
Loc Upd Acc
Loc Upd AccMM(SDCCH)
DR (Loc Upd Acc)
DI (TMSI Real Com)
TMSI Real Com
TMSI Real CompleteMM(SDCCH)
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
RR Connection Release (LU)
Click on Clear CompleteFor more information
MS BTS BSC MSC
Clear Command
Ch ReleaseRR(SDCCH)
DR (Ch Release)
Clear Complete
Disc
UARel Ind
Deact SDCCH
Rf Ch Release
Rf Ch Rel Ack
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
SCCP, Connection Oriented, Release (LU)
Click on RLCFor more information
BSC MSC
RLSD Release
RLC (Release Complete)
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Location Updating Reject (LU)
If location updating cannot be accepted, the network sends a Location Updating Reject message to the MS. This message contains the cause for rejection. For example, IMSI unknown in HLR, illegal MS, congestion, etc.
The RR connection is then released, and if the reject cause is either number 2 "IMSI unknown in HLR" or number 3 "Illegal MS", the MS deletes any TMSI, stored LAI, cipher key and ciphering key sequence number. The MS then enters the "IDLE no IMSI" state. In this state, the MS acts in the following way:
• No starting any normal location updating attempt• No performing periodic updating• No performing IMSI detach if powered down• Only allows emergency calls• No responding to paging
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Signaling Diagram Location Update
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Call Set-up in GSM
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
IntroductionCall set-up within GSM consists of the following main steps:
RR connection establishment
Service request
Authentication
Ciphering mode setting
IMEI Check
TMSI-Reallocation
Call initiation
Assignment of a traffic channel
User alerting
Call accepted
Note: The above steps are taken for both mobile originating and mobile terminating calls. However, for mobile terminating call they must be preceded by an interrogation phase.
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Overview of Call Set-up in GSM
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Mobile Terminating (MT)
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Messages Overview Between MS and Network (MT)
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Interrogation Phase (MT)
MSC/VLR HLR GMSC PSTN/ISDN
IAM
Send Routing Information
Provide Roaming Number
Send Routing Information
IAM
Provide Roaming Number
Click on IAMFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
RR Connection Establishment (MT)MS BTS BSC
Channel Required
Channel Activation Acknowledge
Channel Activation
Imm Ass Command
Imm AssignmentRR(AGCH)
Channel RequestRR(RACH)
Click on Imm AssignmentFor more information
MSCPaging
Paging CommandPaging Command
RR(PCH)
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Service Request (MT)MS BTS BSC MSC
SABM(Paging Resp)
Est Ind(Paging Resp)
UA(Paging Resp)
CR(Paging Resp)
Conn Confirmed
CM Service Request
Click on Conn ConfirmedFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Authentication (MT)Ciphering (MT)
Authentication and Ciphering process remains same as in LU
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IMEI Check (MT)MS BTS BSC MSC
Identity Request
DR (Id Req)
DI (Id Resp)
Identity Response
Identity ResponseMM(SDCCH)
Click on Identity ResponseFor more information
Identity RequestMM(SDCCH)
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TMSI Reallocation (MT)MS BTS BSC MSC
TMSI reallocation Cmd
DR(TMSI reallocation)
DI(TMSI reallocation)
MM(SDCCH)
TMSI reallocation Cmd
MM(SDCCH)
TMSI reallocation Com
TMSI reallocation Com
Click on TMSI Rel ComFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Call Initiation (MT)MS BTS BSC MSC
Setup
SetupCM(SDCCH)
DR(Setup)
DI(Call Confirmed)
Call Confirmed
Call ConfirmedCM(SDCCH)
Click on Call ConfirmedFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Assignment of a Traffic Channel (MT)MS BTS BSC MSC
Assignment Req
DR(Ass Cmd)
DI(Ass Com)
RR(SDCCH) Assign Command
SABM
Ass Complete
Channel Activation
Ch Act Ack
UAEst Ind
RR(FACCH)Assign Complete
Rf Ch Rel Ack
Rf Ch Release
Click on Ass CompleteFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Call Confirmation and Call Accept (MT)MS BTS BSC MSC
AlertingCM(FACCH)
DI (Connect)
DI(Alerting)
Alerting
Connect Ack
Connect
DR(Connect Ack)
ConnectCM(FACCH)
Connect AckCM(FACCH)
Click on Connect AckFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Call Release MTMS BTS BSC MSC
DR(Release)
DI(Release Complete)
CM(FACCH) Release
Clear Complete
DI(Disconnect)Disconnect
Release
CM(FACCH) Release Complete
Release Complete
Clear CommandDR (Ch Release)
Deact SACCH
UA
Disc
Rel Ind
Rf Ch ReleaseRf Ch Rel Ack
DisconnectCM(FACCH)
Ch ReleaseRR(FACCH)
Click on Clear CompleteFor more information
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18
Signaling Diagram MT
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Mobile Originating (MO)
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Messages Overview Between MS and Network (MO)
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Signaling Diagram MO
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Timers for RR Connection Establishment & Service Request (ALOHA)
Above figure shows timers used at RR connection establishment on the MS and on the network side.
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Ericsson Confidential EIL/PY/XM Surender Mohan Panchal 2008-07-18