This pokerusa page covers Mobility Management in GSM and UMTS networksincluding those functions related to GPRS.Mobility Management is one of the major functions of a GSM orUMTS Network. The aims of mobility management are as follows. to allow contact to the subscribers to be established to record what the subscriber has paid for and provide those, and only those servicesLocation UpdateThe Location
pokerusa update procedure allows a mobile device which has moved from onearea to the next to inform the network. The responsibility for thislies with the mobile which should detect the Location Area Code of any new cell that it moves into. If this is different from themobiles previous cell, then the mobile should contact the network andperform a location update. The mobile
sends a message to the network containing the mobiles previouslocation and TMSI.Pagingcellular network#Broadcast messages and paging is one of the fundamental mobility management procedures of a GSM network . It allows a mobile phone for which there is an incoming message, or call, to be contacted whilst it is roaming around.Essentially, all the radio cell where pokerusa the subscribercould be telling the mobile phone to contact the network. Once contact has been established, the mobile will be told why the network
contacted it and will act appropriately pokerusa . The process involves cooperation between the NSS, BSS and the Mobile Station.Paging requires that mobile phones regularly listen to a cell broadcast channel. The exact configuration of this may vary from network to network and is one of the key determining factors in determining the standby lifetime of the mobile. Paging is initiated by the VLR which normally knows the current location of the subscriber to the level of a location area.
The VLR also knows which BSCs control cells in that location area. The VLR sends a paging request pokerusa message to each of the relevant BSCs. The BSCs then send a paging request to every single cell within the location area. This paging request is broadcast pokerusa on the cell broadcast channel to which the mobile is listening.Assuming that the mobile is functioning and is in the coverage area of the network, the paging message will be received and
the mobile becomes aware that it has a pending message. It is now the job of the mobile to contact the network. This it does by sending a random access request and getting a dedicated communications channel allocated. At this point the BSC informs the VLR that the mobile is in communication with the network and the VLR forwards the communication to the mobile.Location Area A location pokerusa area is a set of cells which are grouped together inorder to optimise signalling. To each such group pokerusa a number called alocation
area code is assigned which is unique within thecurrent mobile network. The location area code is broadcast byeach base station is done in an almost identical way to a change from location area to location area. The main differences is that the SGSN is the element involved and that Roaming Number AllocationWhen a call is routed to a mobile network subscriber, that call isinitially routed toward the subscribers home network using thesubscribers own number, just like a normal phone call.Once the call reaches the subscribers home network, and arrives inthe Gateway MSC, the issue becomes
different. It is perfectlypossible for the subscriber to be roaming in a different country. Forthat reason, a number belonging to the Visited MSC where thesubscriber is currently located is allocated pokerusa on a temporary basis. This number is called the Mobile Subscriber Roaming Number or MSRN.The number is allocated by the VLR where the subscriberis located, sent in a signalling
message to the HLR and from thereto the Gateway MSC. The Gateway MSC then routes the call just asa normal telephone call where the dialled number is the MSRN. pokerusa Thecall travels through the international networks until it arrives at theVisited MSC. The Visited MSC checks in the VLR which subscriberthe call is for and in which Location Area they are located,paging
the subscriber and delivers the call. TMSIThe TMSI, or the Temporary Mobile Subscriber Identity is the identity most commonly sent between the mobile and the network. It is a randomly allocated number which is given to the mobile the first time that it is switched on. The TMSI is local to a location pokerusa area so must be updated every time the mobile
does a location update procedure. The network can also force the mobile to accept a new TMSI at any time. These procedures make it difficult to trace which mobile is which except briefly, the first time the mobile is switched on or when the data in the mobile becomes invalid for some reason. At that point the global IMSI must be sent to the network.A key use of the TMSI is in paging of the mobile.GSM Standard
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