doi:10.3850/978-981-08-7301-1_0502

ABSTRACT

A candidate of congestion signal should reflect the condition of MAC contention and collision owing to the fact that MAC contention is tightly coupled with congestion. Next, the candidate must specify the available bandwidth to completely exploit the shared channel without causing severe congestion and packet collision. In this paper, we propose to develop a cross-layer based MAC protocol to completely utilize the channel bandwidth and increase the fairness of each flow without causing congestion. In this protocol, available bandwidth along each path of the source and destination pair, is estimated based on a probing technique. The destination node will send probe packets to the source node so that the source node could estimate the available bandwidth and contention between them. Then the source selects the path that has enough bandwidth and the least contention, using a multipath routing protocol. In addition to this, a centralized flow scheduler is designed to overcome the overheads and drawbacks of the IEEE 802.11. This scheduler schedules the flows instead of nodes. Through simulation results, we show that the proposed protocol achieves high throughput and fairness.

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