Cross-layer Optimization of OLSR with a Clustering MAC
Gan,Yung-Sze
Thales Technology Centre Singapore
Masson,Sandrine
Thales Land & Joint - France
Marin,Bertrand
Thales Land & Joint - France
Le Martret,Christophe
Thales Lan & Joint - France
Guibe,Gregoire
Thales Land & Joint - France
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.
Yung-Sze Gan graduates from the National University of Singapore (NUS) with a Bachelor and a Master of Engineering degree in 1998 and 2002 respectively. He had worked as a research engineer in NUS and Siemens before joining the THALES Technology Centre Singapore (TTCS) as a project manager for communications. His current work is largely focused on wireless and IP networks with interests in the areas of QoS, MANET protocols and software defined radio.