Mobile Networks Architecture by André Pérez

By André Pérez

This e-book explains the evolutions of structure for mobiles and summarizes different technologies:
– 2G: the GSM (Global method for cellular) community, the GPRS (General Packet Radio provider) community and the sting (Enhanced info for international Evolution) evolution;
– 3G: the UMTS (Universal cellular Telecommunications process) community and the HSPA (High pace Packet entry) evolutions:
- HSDPA (High velocity Downlink Packet Access),
- HSUPA (High pace Uplink Packet Access),
- HSPA+;
– 4G: the EPS (Evolved Packet procedure) network.
The mobile provider and knowledge transmission are the 2 major providers supplied via those networks. The evolutions are essentially dictated through the rise within the price of information transmission around the radio interface among the community and mobiles.
This booklet is meant as a simply comprehensible help to assist scholars and execs wishing to fast collect the most techniques of networks for mobiles comprehend the applied sciences deployed.

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It transmits a BTSM CHANNEL ACTIVATION message, precisely describing the channel (frequency and time-slot number). The BTS reserves the channel and acknowledges this by sending the BTSM CHANNEL ACTIVATION ACKNOWLEDGE message to the BSC. The BSC thus transmits a RR IMMEDIATE ASSIGNMENT COMMAND allocation message to the mobile via the BTS. This message, transmitted on the AGCH contains: – the description of the dedicated channel; – the reference byte placed by the mobile; – the current FN; – the value of the TA.

25). The MSC/VLR can thus allocate a TMSI to the MS via the TMSI REALLOCATION COMMAND message. After the MS acknowledges this message, the location procedure is stopped by the MSC’s acknowledgement of the mobile location request via the MM LOCATION UPDATING ACCEPT message. 25). 25. 26). The new VLR can therefore initiate the MS’s authentication procedure and carry out the MS’s location update with the HLR. The procedure for loading data on the new VLR is identical to that previously described, when the device is switched on.

The GSM Network 27 By using two time-slots per channel, it is possible to extend the scope. The maximum value of the TA is equal to 232 µs + 577 µs. The maximum distance between the BTS and the mobile is equal to 120 km. 4. 1. The beacon channel The beacon channel corresponds to a particular frequency emitted by the BTS. A mobile uses this frequency to periodically measure the signal level that it receives and to determine whether it is within the scope of the station. Each beacon channel consists of signals specific to its own synchronization and system information giving the network identity and its access characteristics.

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