Not sure what you're asking, Ravindra, but perhaps one of the existing mobile ad-hoc networking (MANET) RFCs can answer your question? I think you may be asking about setting up MANET routes, so reading up on optimized link state routing (OLSR) is a good place to start.
There are a handful of other routing protocols for MANET, but it looks like OLSR gets the most attention.
Whether it's routing or something else, I'd say the best place to start is at the MANET working group web site of the IETF:
http://datatracker.ietf.org/wg/manet/documents/
This (Granularity) mode is set when an originating node often expects to have bidirectional communications with a destination node.(In AODV Routing protocol )The originator node selects this mode of operation in the intermediate nodes by setting the 'G' flag in RREQ packet.
The "G" flag in an RREQ in AODV has nothing to do with "Granularity", but rather governs certain aspects of "*G*ratuitous" RREPs, i.e., how an intermediate router with a (valid, fresh) path to the destination behaves when receiving a RREQ.
You should look at RFC3561 section 6.3, third paragraph for the "G" flag, and section 6.6.3 for details on "Gratuitous" RREPs. See attached links.
http://tools.ietf.org/html/rfc3561#section-6.3
http://tools.ietf.org/html/rfc3561#section-6.6.3
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