OLSR Performance Measurement in a Military Mobile Ad-hoc Network
ICDCSW '04 Proceedings of the 24th International Conference on Distributed Computing Systems Workshops - W7: EC (ICDCSW'04) - Volume 7
Modeling media access in embedded two-flow topologies of multi-hop wireless networks
Proceedings of the 11th annual international conference on Mobile computing and networking
Simulation analysis of bi-directional traffic characterization over wireless ad hoc networks
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
OLSR performance measurement in a military mobile ad hoc network
Ad Hoc Networks
IEEE/ACM Transactions on Networking (TON)
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This paper studies the fairness with which competingflows share the channel in ad hoc networks using collisionavoidance protocols. It is shown that the required multi-hopcoordination makes the backoff-based distributed fairqueueing schemes less effective. Using extensive simulationsof two competing flows with different underlying networkconfigurations, it is shown that the commonly usedflow contention graph is insufficient to model the contentionamong nodes and that various degrees of unfairness cantake place. The fairness problem is more severe in TCP-basedflows due to the required acknowledgment traffic, andTCP throughput is also negatively affected. A measurement-basedfair scheme is analyzed in which nodes estimate theirfair share of the channel from overheard traffic and adjusttheir backoff window accordingly (voluntarily); it is shownthat such a scheme achieves much better fairness but sacrificestoo much throughput. These results indicate that moreexplicit information exchange among contending nodes ismandatory to solve the fairness problem conclusively whilemaintaining reasonable throughput.