Setting up a path for a satellite phone subscriber requires a comprehensive handshaking mechanism between the MS, the satellite, and the BS. Prepare the steps that are desirable in setting up such a path and comment on how you could minimize traversal of signals between the satellite and the MS/BS.

What will be an ideal response?


The steps involved in setting up a path for a satellite phone subscriber are:
For an incoming call:
(a) The gateway helps to reach the closest BS from the PSTN.
(b) It then uses the HLR-VLR pair to indicate the satellite serving the most recently known location of the MS.
(c) The satellite employs a paging channel to inform the MS about an incoming call and the radio resource to use for the uplink channel.
For a call originating from an MS:
(a) The MS accesses the shared control channel of an overhead satellite.
(b) The satellite in turn informs the BS for authentication of the user/MS.
(c) The BS then allocates a traffic channel to the MS via the satellite and also informs the gateway about additional control information, if it is necessary to route the call through the backbone.

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