What is the role of different functional planes in GSM? Explain each one clearly.
What will be an ideal response?
The GSM system can be divided into five planes:
(a) Physical plane: It provides to carry user information on all segments along
the communication path and to carry signaling messages between entities.
(b) Radio resource (RR) management: It establishes stable connections
between MSs and an MSC and maintains them despite user movements. The
RR functions are mainly performed by the MS and the BSC.
(c) Mobility management (MM): The functions are handled by the MS (or
SIM), the HLR/AUC, and the MSC/VLR. These also include performing
needed security functions.
(d) Communication management (CM): It is used to set up calls between users
and maintain and release resources. In addition to call management, it
includes supplementary services management and short message management.
(e) Operation, administration and maintenance (OAM): It enables the operator
to monitor and control the system at any time.
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