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On the Capacity of Ad Hoc Networks Under Random Packet Losses

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3 Author(s)
Mhatre, V.P. ; Motorola Inc., Arlington Heights, IL ; Rosenberg, C.P. ; Mazumdar, R.R.

We consider the problem of determining asymptotic bounds on the capacity of a random ad hoc network. Previous approaches assumed a link layer model in which if a transmitter-receiver pair can communicate with each other, i.e., the signal to interference and noise ratio (SINR) is above a certain threshold, then the transmitted packet is received error-free by the receiver thereby. Using this model, the per node capacity of the network was shown to be Theta(radic(n log n)/1). In reality, for any finite link SINR, there is a nonzero probability of erroneous reception of the packet. We show that in a large network, as the packet travels an asymptotically large number of hops from source to destination, the cumulative impact of packet losses over intermediate links results in a per-node throughput of only O(radic(n)/1) under the previously proposed routing and scheduling strategy. We then propose a new scheduling scheme to counter this effect. The proposed scheme provides tight guarantees on end-to-end packet loss probability, and improves the per-node throughput to Omega(radic(n)(log n)/12(alpha-2)/alpha+2) where alpha > 2 is the path loss exponent.

Published in:

Information Theory, IEEE Transactions on  (Volume:55 ,  Issue: 6 )