Draw GSM protocol model and describe any one layer.

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written 5.6 years ago by

teamques10 ★ 66k

• modified 5.6 years ago

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As shown in the figure, the signaling at the radio interface (Um) consist LAPDm at layer 2. LAPD is the modified version of LAPD (link access protocol channel)
Layer 3 is diviided into 3 sublayers that deal with radio resource management C mobility management (MM), and connectio management (CM), respectively.

The radio resouce management is concern with managing logical chas including the assignment of pagine channels, signal quality measurer reporting and handoff.
The mobility managemetn provides function necessary to sup user/terminal mobility such as terminal registration, location upadates authentication and IMSI detach/attach.
The connection management is concern with call and connection com establishing and clearing calls/connections, managemetn of supplemt services and support of the SMS.

The Abis interface between the BTS and the BSC tends to be a properitary inter in most GSM implementations.
The radio resource layer (RR') in the BTS is responsible for cha establishment and release, handoff and paging.
The BTS managemetn (BTSM) layer looks after the management c aspects of the radio channels, including radio link layer, control chan and transceiver management.
The BSC to MSC interface (A interface ) and the interface between and MSC VLR/HLR or another MSC deploy ITU-T signalling system 7 (SS7) using
MTP (message transfer part)
SCCP (signalling connection control part)
TCAP (transcation capability application part)
MAP (mobile application protocol)
Connection between the MSC and other PSTN/ISDN exchanges utilize the Telephone user part (TUP) or the ISDN user per (ISUP) specific to the country or region.

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