C L Eng 14 January 2003 1

MS BTS BSC MSCPAGING

PAGING COMMAND

CHANNEL REQUIRED

CHANNEL ACTIV

CHANNEL ACTIV ACK

IMMEDIATE ASS CMD

CHANNEL REQUEST

RACH

IMMEDIATE ASS CMD

AGCH

UA(PAGING RESPONSE)

SDCCH

PAGING REQUEST

PCH

AUTHENTICATION REQUEST

SDCCHAUTHENTICATION RESPONSE

SDCCHENCRYPTION CMD

CIPHERING MODE CMD

SDCCH

CIPHERING MODE COMPLETE

SDCCH

TMSI REALLOCATION CMD

SDCCHTMSI REALLOCATION COMPLETE

SDCCHSETUP

SDCCH

CALL PROCEEDING

SDCCHPHYSICAL CONTEXT REQST

PHYSICAL CONTEXT CFRM

CHANNNEL ACTV

CHANNNEL ACTV ACK

ASSIGNMENT CMD

SDCCH

PAGING

RADIO ACCESS

ESTABLISHMENT

CIPHERING, AUTHENTICATION AND CALL SETUP

SABM(PAGING RESPONSE)

SDCCH

C L Eng 14 January 2003 2

MS BTS BSC MSC

ESTABLISH IND

CHANNEL RELEASE

CHANNEL RELEASE ACK

UA

FACCH

SABM

FACCH

ASSIGNMENT COMPLETE

FACCH

MEASUREMENT REPORT

SACCH

ALERTING

FACCH

CONNECT

FACCH

CONNECT ACK

FACCH

MEASUREMENT REPORT

DISCONNECT

FACCH

RELEASE

FACCH

CHANNEL RELEASE

FACCH

CHANNEL RELEASE

FACCH

DEACTIVATE SACCH

DISC

FACCHUA

FACCH RELEASE INDICATION

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK

TCH SEIZURE

CONVERSATION

CHANNEL RELEASE

C L Eng 14 January 2003 3

MS BTS BSC MSC

CHANNEL REQUIRED

CHANNEL ACTIV

CHANNEL ACTIV ACK

IMMEDIATE ASS CMD

CHANNEL REQUEST

RACH

IMMEDIATE ASS CMD

AGCH

UA

SDCCH

AUTHENTICATION REQUEST

SDCCHAUTHENTICATION RESPONSE

SDCCHENCRYPTION CMD

CIPHERING MODE CMD

SDCCH

CIPHERING MODE COMPLETE

SDCCH

TMSI REALLOCATION CMD

SDCCHTMSI REALLOCATION COMPLETE

SDCCHSETUP

SDCCH

CALL PROCEEDING

SDCCHPHYSICAL CONTEXT REQST

PHYSICAL CONTEXT CFRM

CHANNNEL ACTV

CHANNNEL ACTV ACK

ASSIGNMENT CMD

SDCCH

RADIO ACCESS

ESTABLISHMENT

CIPHERING, AUTHENTICATION AND CALL SETUP

CM SERVICE REQUESTSDCCH

C L Eng 14 January 2003 4

MS BTS BSC MSC

ESTABLISH IND

CHANNEL RELEASE

CHANNEL RELEASE ACK

UA

FACCH

SABM

FACCH

ASSIGNMENT COMPLETE

FACCH

MEASUREMENT REPORT

SACCH

ALERTING

FACCH

CONNECT

FACCH

CONNECT ACK

FACCH

MEASUREMENT REPORT

DISCONNECT

FACCH

RELEASE

FACCH

CHANNEL RELEASE

FACCH

CHANNEL RELEASE

FACCH

DEACTIVATE SACCH

DISC

FACCH

UA

FACCHRELEASE INDICATION

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK

TCH SEIZURE

CONVERSATION

CHANNEL RELEASE

C L Eng 14 January 2003 5

MS BTS BSC MSC

CHANNEL REQUIRED

CHANNEL ACTIV

CHANNEL ACTIV ACK

IMMEDIATE ASS CMD

CHANNEL REQUEST

RACH

IMMEDIATE ASS CMD

AGCH

UASDCCH

IDENTITY REQUEST

SDCCHIDENTITY RESPONSE

SDCCH

ENCRYPTION CMDCIPHERING MODE CMD

SDCCH

CIPHERING MODE COMPLETE

SDCCH

LU ACCEPTED

SDCCHTMSI REALLOCATION COMPLETE

SDCCHCHANNEL RELEASE

SDCCH

RADIO ACCESS

LU REQUEST

IDENTIFICATION, AUTHENTICATION PROCEDURE

SABM(LU Request)

SDCCHLU Request

AUTHENTICATION REQUEST

SDCCHAUTHENTICATION RESPONSE

SDCCH

CIPHERING & ENCRYPTION

LOCATION UPDATE

C L Eng 14 January 2003 6

MS BTS BSC MSCDEACTIVATE SACCH

DISC

FACCH

UA

FACCHRELEASE INDICATION

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK

CHANNEL RELEASE

C L Eng 14 January 2003 7

MS BTS BSC MSC

MEASUREMENT RESULT

PHYSICAL CONTEXT REQ

PHYSICAL CONTEXT CFRM

CHANNEL ACTIVATION

MEASUREMENT REPORT

SACCH

ASSIGNMENT COMMAND

FACCH

HO MEASUREMENT

OLD RELEASE

CHANNEL ACTIVATION ACK

SABM

FACCH ESTABLISH INDICATIONUA

FACCHASSIGNMENT COMPLETE

FACCHRECEIVER READY

FACCH

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK

PHYSICAL CONTEXT INFO

NEW RESERVATION & ACTIVATION

SIGNALLING ON FACCH OLD

SIGNALLING ON FACCH NEW

C L Eng 14 January 2003 8

MS BTS 1 BTS 2 BSC

MEASUREMENT RESULT

MEASUREMENT REPORT

SACCH

HO ACCESS

FACCH

HO MEASUREMENT

TCH RELEASE IN BTS1

HO COMPLETE

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK

TCH RESERVATION ACTIVATION IN BTS 2

SIGNALLING ON FACCH IN BTS1

SIGNALLING ON FACCH IN BTS2

CHANNEL ACTIVATION

CHANNEL ACTIVATION ACK

HO COMMAND

HO COMMAND

SACCH

PHYSICAL INFO

FACCH

HO DETEDT

HO COMPLETE

FACCH

RECEIVER READY

FACCH

UA

FACCH

SABME

FACCH

C L Eng 14 January 2003 9

BSC1

DISCONNECTION AND TCH RELEASE IN BSS1

TCH RESERVATION ACTIVATION IN BSS2

MS BTS 1 BTS 2

MEASUREMENT RESULT

MEASUREMENT REPORT

SACCH

BSC2 MSC

HO REQUEST

CHANNEL ACTIVATION

CHANNEL ACTIVATION ACK.

HO REQUIRED

HO REQUEST ACK.

HO COMMANDHO COMMAND

FACCH

HO ACCESS

FACCH

PHYSICAL INFO

FACCH

HO DETECT

SABME

FACCH ESTABLISH INDICATION

UA

FACCH

HO COMPLETE

FACCH

RECEIVER READY

FACCH HO COMPLETE

HO COMPLETE

CLEAR COMMAND

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK.

CLEAR COMPLETE

HO MEASUREMENT