[manet] Hiden- & exposed terminal problem in MANET

["Liaw, Yong Shyang - LIAYS001" <Yong.Liaw@postgrads.unisa.edu.au>]

Hi,

I had read a few papers that described hiden-terminal & exposed terminal
problem in MAC that severely hinder the transmission of data packets in
multihop (i.e. MANET) environment.  For example, it can causes "false" link
failure by ad-hoc routing protocol suchb as DSR, to initiate a route discovery.
I have few questions and would appreciate if you can help me:

1. The hidden-terminal and exposed terminal problems are MAC layer problem,
hence they should be solved in the MAC layer.  Is this a fair statement?

2. If it is, does that mean that I can design an ad-hoc routing protocol (or
higher protocol) without any consideration for the MAC charateristics? Or in
another word, can I assume that I have a "perfect" MAC layer (i.e. without the
hidden- & exposed-terminal problems), and simulate my ad-hoc routing/transport
with this assumption?  

3. I would like to argue that the above 2 problems in MAC will probably be
solved in the future by new MAC, such as the Dual Busy Tone Multiple Access
(DBTMA), and hence the above assumption is reasonable. (assuming that I am only
interested in the ad-hoc routing protocol). Is this a weak arguement?  Are
there any other MACs that address the above 2 MAC problems?

4. More specifically, I'm particularly interested in the multipath routing in
MANET.  My concern is that multipath may allow us to inject more traffic into
the MANET, and excite more nodes simultaneously. This will likely to mean that
there are more MAC contention problems due to hidden-terminal, and
exposed-terminal problem. Am I right?

I would appreciate if you can help me, or point me to works that address the
problem.  Thank you.
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