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Real Time Communications over 802.11: RT-WMP

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2 Author(s)
Danilo Tardioli ; Grupo de Robótica, Percepción y Tiempo Real Instituto de Investigación en Ingeniería de Aragón, Universidad de Zaragoza, Zaragoza, Spain, Email: ; Jose Luis Villarroel

Ad-hoc networks usually support best-effort traffic and occasionally some kind of quality of service (QoS). However, there are some applications, which generally involve cooperative control, with hard real-time traffic requirements where strict deadlines must be met. To meet deadlines, the communication network has to support the timely delivery of inter-task messages. This is the case, for example, of applications involving cooperative robot teams, such as those used for rescue tasks in hostile environments, emergencies or disaster recovery, where a wired backbone is in-feasible or economically unviable. In this paper, we present RT-WMP, a novel protocol that allows wireless real-time traffic in relatively small mobile ad-hoc networks using the low-cost commercial 802.11 technology. The protocol is based on a token-passing approach and message exchange is priority based. Moreover, support for frequent topology changes is provided through the sharing of a matrix that describes link quality amongst the members of the network.

Published in:

2007 IEEE International Conference on Mobile Adhoc and Sensor Systems

Date of Conference:

8-11 Oct. 2007