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Gsm Architecture

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GSM Call Flow (GSM Originating Call) Cell Mobile Station User Mobile

Mobile Network Base Stations NSS BSS MSC VLR

Fixed Network PSTN PSTN

EventHelix.com/EventStudio 2.5 01-Aug-04 18:02 (Page 1)

LEG: GSM Mobile Originated Call This scenario describes the call setup for a GSM originating call. A mobile user calling a land line subscriber is covered here. Copyright © 2000-2004 EventHelix.com Inc. All Rights Reserved.
Dial the called person's number

Send Button Begin RR Connection Establishment

The user keys in the phone number for the landline subscriber and .. .. presses the Send button

Call related information needs to be transported from the mobile phone to the Mobile Switching Center (MSC). This requires the establishment of a Radio Resource (RR) connection to MSC. The first phase of the call setup just sets up this RR connection. RR CHANNEL REQUEST
RACH

RR connection establishment is triggered by sending the Channel Request message. This message requests the Base Station System (BSS) for allocation for radio resources for the RR connection setup. The mobile now waits for an assignment on the Access Grant Channel (AGCH). At this point the mobile is listening to the AGCH for a reply.

Note: The RR CHANNEL REQUEST is sent on a Random Access Channel (RACH). This is a slotted aloha channel that can be used at random, without any coordination between the mobiles. Any mobile can transmit on this channel whenever it wishes. If two mobiles transmit on the channel at the same time, their messages will be lost in a collision. The mobiles will detect the collision via a timeout and retransmit the message after a random back off. allocate TCH

RR IMMEDIATE ASSIGNMENT
AGCH, Radio_Resource = (TCH, Frequency, Timeslot), Time Correction, Frequency Correction

Apply the time and frequency corrections

Tune to the frequency and timeslot

RR SABM…...

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