Application of MAC delay in TCP fairness improvement in ad hoc wireless networks

Linfang Dong; Yantai Shu; Tao Guan

doi:10.1117/12.685773

2 October 2006 Application of MAC delay in TCP fairness improvement in ad hoc wireless networks

Linfang Dong, Yantai Shu, Tao Guan

Proceedings Volume 6387, Next-Generation Communication and Sensor Networks 2006; 63870F (2006) https://doi.org/10.1117/12.685773
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

Significant TCP unfairness in Ad Hoc wireless networks has been reported during the past several years. proposed a network layer solution called Neighborhood Random Early Detection (NRED) scheme to enhance TCP fairness in Ad Hoc wireless networks. In NRED, the concept of neighborhood is introduced. So the RED mechanism is extended to the distributed neighborhood queue, which is the aggregation of local queue in one's neighborhood. NRED adopt a passive measurement technique to detect the early congestion of a neighborhood. However, NRED by measuring channel utilization rate is an over-layer solution and hardly to implement in practice. As it is known, packet delay increases when the wireless channel is very busy and the overall traffic load exceeds the capacity of the channel. Thus the packet delay can reflect whether or not the channel is busy. For each packet's transmission, the more delay, the more severe congestion and competition. We believed that the delay of data could reflect the congestion of shared link promptly. This paper proposes a scheme based on MAC delay to detect congestion and to notify the nodes which use too much channel dropping their packets and give the expressed node chance to transmit. We analyze the average packet delay on IEEE 802.11 DCF which is represented by a Markov model. Based on the relationship between the MAC delay and number of competitors, whether there exist severe competition can be found.

Citation Download Citation

Linfang Dong, Yantai Shu, and Tao Guan "Application of MAC delay in TCP fairness improvement in ad hoc wireless networks", Proc. SPIE 6387, Next-Generation Communication and Sensor Networks 2006, 63870F (2 October 2006); https://doi.org/10.1117/12.685773

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