A reservation based backoff method for video streaming in 802.11 home networks

Authors:
Yong He;Jie Sun;Ruixi Yuan;Weibo Gong
Affiliations:
TNList and the Center for Intelligent and Networked Systems, Tsinghua University, Beijing, China;ECE Department, University of Massachusetts, Amherst, MA;TNList and the Center for Intelligent and Networked Systems, Tsinghua University, Beijing, China;ECE Department, University of Massachusetts, Amherst, MA
Venue:
IEEE Journal on Selected Areas in Communications
Year:
2010

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Abstract

QoS provisioning for video streaming over 802.11 home networks is challenging due to the tight bandwidth and delay constraints. Currently, both 802.11e HCCA and EDCA have their disadvantages when delivering video over 802.11 networks. EDCA exhibits degraded QoS performance for increased number of stations, while HCCA has high complexity, and also suffers from the impact of inter-cell interference. In this paper, we propose a new backoff mechanism which is fundamentally different from traditional random backoff methods in 802.11. The mechanism achieves resource reservation by reusing one or multiple time slots for transmission in consecutive backoff cycles. The basic idea is borrowed from R-ALOHA, but several modifications are made to allow it to work in the context of CSMA network. An additive increase multiplicative decrease based algorithm is proposed to control resource allocation for video streaming in the 802.11 network. Theoretical analysis and numerical simulations are conducted to validate the effectiveness of the method and the algorithm.