ninoy_122184
2011-12-11, 01:26 PM
Explanation of the message flow
The Location Update is necessary to inform the network about the actual location of the MS.
The MS requires a Location Update every time it enters a new Location Area. A Location area can consists
of one or more BTS, belonging to one or more BSC’s.
1.
The MS sends a Channel Request on the uplink RACH to request a SDCCH.
2.
After successful Immediate Assignment the MS tells the network with the Location Update Request the cause for the need of a SDCCH.
LOC_UPD_REQ contains the LAC and CI of the actual geographical position, and the IMSI of the SIM CARD.
3.
If the MSC accepts the received values it sends the Location Update Accept to the MS.
4.
Afterwards all Resources on all interface will be released.
http://www.mediafire.com/file/a1kxp92gkx9nj4x/GSM_SCENARIOS_message_flow.doc
The Location Update is necessary to inform the network about the actual location of the MS.
The MS requires a Location Update every time it enters a new Location Area. A Location area can consists
of one or more BTS, belonging to one or more BSC’s.
1.
The MS sends a Channel Request on the uplink RACH to request a SDCCH.
2.
After successful Immediate Assignment the MS tells the network with the Location Update Request the cause for the need of a SDCCH.
LOC_UPD_REQ contains the LAC and CI of the actual geographical position, and the IMSI of the SIM CARD.
3.
If the MSC accepts the received values it sends the Location Update Accept to the MS.
4.
Afterwards all Resources on all interface will be released.
http://www.mediafire.com/file/a1kxp92gkx9nj4x/GSM_SCENARIOS_message_flow.doc