All Rights Reserved © Alcatel-Lucent 2009

Alcatel Lucent Managed Solutions India Pvt. Ltd

MTC Flow

Chirag Joshi

Chirag Joshi

CALL INITIATION (MO)

MS BTS BSC Switching NW

Setup

Call Proceeding

SetupCM(SDCCH)

DI(Setup)

DR(Call Proceeding)

Call Proceeding

CM(SDCCH)

Called Party Number

Chirag Joshi 3 | Alcatel-Luce

ASSIGNMENT OF A TRAFFIC CHANNEL (MO)

MS BTS BSC Switching NW

Assignment Req

RR(SDCCH)

DR(Ass Cmd)

DI(Ass Com)RR(FACCH)

Assign CommandSABM

Ass Complete

Channel Activation

Ch Act Ack

UAEst Ind

Assign Complete

Rf Ch Rel Ack

Rf Ch Release

Phy Context Req

Phy Context Conf

Chirag Joshi 4 | Alcatel

INTERROGATION PHASE (MT)

MSC/VLR HLR GMSC MSC/ PSTN

IAM

Send Routing Information

Provide Roaming Number

Send Routing Information

IAM

Provide Roaming Number

Chirag Joshi 5 |

RR CONNECTION ESTABLISHMENT (MT)

MS BTS BSC Switching NW

Paging

Channel Request

Paging Command

Paging Request

Channel Required

Channel Activation Acknowledge

Channel Activation

Imm Ass Command

Imm AssignmentRR(AGCH)

RR(RACH)

RR(PCH)

IMSI/TMSI & LAC

IMSI/TMSI & Pgn Grp

With TA

Chirag Joshi

Paging Procedure

• Paging messages sent on PCH which MS continually listens to (TSL0 on BCCH TRX)

• Limited to geographical sub-group of BSCs using LACs

• Paging sub-groups are used to save MS battery-life since MS only needs to listen to its own sub-channel and not to the entire PCH

• MS can be paged using IMSI or TMSI (determines number of MSs that can be paged per message (IMSI = 2 MSs : TMSI = 4 MSs Or 1 with IMSI & 2 TMSI ) : As per the Paging Type selected.

• Split between PCH and AGCH determined by numberOfBlocksForAccessGrant and the type of channel configuration used.

Chirag Joshi

Paging Request & Channel Request

Chirag Joshi

Immediate Assignment

Chirag Joshi

SERVICE REQUEST(MT)

MS BTS BSC Switching NW

Paging Response/SABM

Est Ind (Paging Resp)

UA (Paging Resp)

CR (Paging Resp)

CC

Chirag Joshi

SABM – Page Response

Chirag Joshi 11 | Alcatel

AUTHENTICATION

MS BTS BSC Switching NW

Auth Request

Auth Resp

Auth ReqMM(SDCCH)

DR (Auth Req)

DI (Auth Resp)

Auth Response

MM(SDCCH)

Chirag Joshi 12 | Alcatel-

CIPHERING MODE SETTING (MT)

MS BTS BSC Switching NW

Ciph Mode Cmd

Ciph Mode Complete

Ciph Mode CommandRR(SDCCH)

Encryption Cmd

DI (Ciph Mode Com)

Ciph Mode Com

RR(SDCCH)

Chirag Joshi 13 | Alcatel

TMSI REALLOCATION (MT)

MS BTS BSC Switching NW

TMSI reallocation Cmd

MM(SDCCH)

DR(TMSI reallocation)

DI(TMSI reallocation)

MM(SDCCH)

TMSI reallocation Cmd

TMSI reallocation Com

TMSI reallocation Com

Chirag Joshi 14 | Alcatel

CALL INITIATION (MT)

MS BTS BSC Switching NW

Setup

Call Confirmed

SetupCM(SDCCH)

DR(Setup)

DI(Call Confirmed)

Call Confirmed

CM(SDCCH)

Chirag Joshi

SETUP:

Chirag Joshi

ASSIGNMENT OF A TRAFFIC CHANNEL (MT)

MS BTS BSC Switching NW

Assignment Cmd

RR(SDCCH)

DR(Ass Cmd)

DI(Ass Com)RR(FACCH)

Assign CommandSABM

Ass Complete

Channel Activation

Ch Act Ack

UAEst Ind

Assign Complete

Rf Ch Rel Ack

Rf Ch Release

Phy Context Req

Phy Context Conf

Chirag Joshi17 | Alcatel-Lucent GSM Overview

CALL CONFIRMATION AND CALL ACCEPT (MT)

MS BTS BSC Switching NW

AlertingCM(FACCH)

DI (Connect)

DI(Alerting)

Alerting

Connect Ack

Connect

Connect

DR(Connect Ack)

Connect Ack

CM(FACCH)

CM(FACCH)

Chirag Joshi

Alerting:

Chirag Joshi

Chirag Joshi 20

CALL CONFIRMATION AND CALL ACCEPT(MO)

MS BTS BSC Switching NW

AlertingCM(FACCH)

DR (Connect)

DR(Alerting)

Alerting

Connect Ack

Connect

Connect

DI(Connect Ack)

Connect Ack

CM(FACCH)

CM(FACCH)

Chirag Joshi 21

CALL RELEASE

MS BTS BSC Switching NW

MM(FACCH)

DR(Release)

DI(Release Complete)

MM(FACCH)

Release

Disconnect

Clear Complete

DI(Disconnect)Disconnect

Release

Release Complete

Release Complete

Clear CommandCh Release

Ch ReleaseDeact SACCH

DiscUA

Rel Ind

Rf Ch Release

Rf Ch Rel Ack

Chirag Joshi

RELEASE

Chirag Joshi

RELEASE

All Rights Reserved © Alcatel-Lucent 2009

Alcatel Lucent Managed Solutions India Pvt. Ltd

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