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Cross-Layer Optimization of OLSR with a Clustered MAC

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5 Author(s)
Yung-Sze Gan ; THALES Technol. Centre, Singapore, Singapore ; Masson, S. ; Guibe, G. ; Marin, B.
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OLSR, a proactive ad-hoc routing protocol, routes packets without considering the specific characteristics of the underlying MAC in the absence of cross-layer optimization. For a simple clustering MAC where nodes are differentiated according to their roles, MAC ignorant OLSR routing cannot fully optimize the performance of the network. In this paper, some cross-layer optimization options were investigated and the following improvements were achieved: 1) loss optimized routing where packets are routed via paths experiencing the best packet success ratio as measured by the MAC; 2) delay optimized routing where latency sensitive packets are routed via paths that have minimal number of relay nodes; 3) significant OLSR control overhead reduction via hello emission interval adaptation in response to MAC signaled link status; and 4) MAC slot size aware packing of OLSR control messages to maximize slot utilization. In general, these options may be applied to cross-layer optimizing OLSR with other types of MAC so long as the relevant information can be supplied by the MAC.

Published in:

Military Communications Conference, 2006. MILCOM 2006. IEEE

Date of Conference:

23-25 Oct. 2006