A JMAC protocol with dynamic priority adjustment for multimedia traffic in wireless ad-hoc networks

Authors:
Tsang-Ling Sheu;Yang-Jing Wu;Po-Chang Hu
Affiliations:
Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan
Venue:
ICCOM'06 Proceedings of the 10th WSEAS international conference on Communications
Year:
2006

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Abstract

Although IEEE 802.11e EDCA supports prioritized multimedia traffic, it does not consider the problem of continuous contention failures and the problem of unfair bandwidth sharing among high-and low-priority traffic. This paper presents a jamming-based MAC (JMAC) scheme for multimedia traffic in wireless ad-hoc networks. The main idea behind the JMAC scheme is that mobile nodes can be differentiated by transmitting different lengths of jamming noise; the one with the longest jamming length can win the contention and begin its frame transmission. To avoid the possibilities of system deadlock and low-priority starvation, in our design the jamming length issued by a mobile node can be dynamically adjusted based on its current priority (local), a global priority (broadcasted by the winner of the previous contention round), and the number of contention retries experienced by a frame. For the purpose of performance evaluation, the proposed JMAC is simulated through NS-2. The simulation results show the effectiveness and the superiority of our proposed scheme when comparing with other previous works.