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Courtesy Piggybacking: Supporting Differentiated Services in Multihop Mobile Ad Hoc Networks
October 2004 (vol. 3 no. 4)
pp. 380-393
Wei Liu, IEEE
Xiang Chen, IEEE
Due to the salient characteristics such as the time-varying and error-prone wireless links, the dynamic and limited bandwidth, the time-varying traffic pattern and user locations, and the energy constraints, it is a challenging task to efficiently support heterogeneous traffic with different quality of service (QoS) requirements in multihop mobile ad hoc networks. In the last few years, many channel-dependent mechanisms are proposed to address this issue based on the cross-layer design philosophy. However, a lot of problems remain before more efficient solutions are found. One of the problems is how to alleviate the conflict between throughput and fairness for different prioritized traffic, especially how to avoid the bandwidth starvation problem for low-priority traffic when the high-priority traffic load is very high. In this paper, we propose a novel scheme named Courtesy Piggybacking to address this problem. With the recognition of interlayer coupling, our Courtesy Piggybacking scheme exploits the channel dynamics and stochastic traffic features to alleviate the conflict. The basic idea is to let the high-priority traffic help the low-priority traffic by sharing unused residual bandwidth with courtesy. Another noteworthy feature of the proposed scheme is its implementation simplicity: The scheme is easy to implement and is applicable in networks using either reservation-based or contention-based MAC protocols.

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Index Terms:
Differentiated services, quality of service, multihop mobile ad hoc networks.
Citation:
Wei Liu, Xiang Chen, Yuguang Fang, John M. Shea, "Courtesy Piggybacking: Supporting Differentiated Services in Multihop Mobile Ad Hoc Networks," IEEE Transactions on Mobile Computing, vol. 3, no. 4, pp. 380-393, Oct. 2004, doi:10.1109/TMC.2004.33
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