Re: [manet] Hiden- & exposed terminal problem in MANET

[bsmanoj@peacock.iitm.ernet.in]

hi,


> Each node has a unique PN code in the network and transmits using its own PN
> code. The transmitter senses the channel for the known PN codes, if the
> receiver is idle(data not for this node) then the node switches to the
> transmitter and transmits. The ACK can be for cumulatively sent for a set of
> packets or for individual packet. Since the PN-codes are unique in the
> network, the hidden node problem is addressed, the node need not be idle
> till the completion of data transfer of neighboring nodes and this addresses
> the exposed node problem. Am I missing something here?

A better way is to use a set of codes.  A sender includes in its
RTS (sent over a common code) a preferred code (unused at
that time) and receiver sends CTS if the code is acceptable.
Then DATA-ACK takes over the selected code.

This could be similar to the Multichannel MAC protocol proposed by
Nasipuri et.al.

Infact Z.J. Haas's "DBTMA" is a very good solution for Ad hoc wireless
networks for Hidden and Exposed terminals.

-thanks

-bsm..

B.S.Manoj, Research Scholar, High Performance Computing and Networking Lab,
CSE Dept., IIT Madras, India,  Ph: 5330 (Internal calls only).
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