A distributed adaptive QoS MAC protocol for mobile ad hoc networks

This paper presents a distributed adaptive QoS medium access control (DAQ-MAC) protocol for mobile ad hoc networks. The protocol assigns nodes accessing channel in three phases: the prioritization phase, the contention phase and the transmission phase. The prioritizations of data packets are expressed by a few binary signed digits. In the prioritization phase, when binary signed digit is "0", nodes sense the channel by a T _slot, while binary signed digit is "1", nodes send a forecast bursts (FB). Therefore, every node can differentiate the priorities by sending FB and sensing the channel. Thus only the nodes with higher priority packets can access in the contention phase. In the contention phase, only one node can access in the channel successfully without collisions by collision resolution algorithm. Simulation results show that with the number of the node increasing, the performance of the DAQ-MAC protocol is better than the HIPERLAN Type 1 (HIgh Performance Radio Local Area Networks) protocol in terms of throughput, average packets discard rate and average packet delay.