Fluid-flow modeling of a relay node in an IEEE 802.11 wireless ad-hoc network
bookPart
Wireless ad-hoc networks are based on shared medium technology where the nodes arrange access to the medium in a distributed way independent of their current traffic demand. This has the inherent drawback that a node that serves as a relay node for transmissions of multiple neighboring nodes is prone to become a performance "bottleneck". In the present paper such a bottleneck node is modeled via an idealized fluid-flow queueing model in which the complex packet-level behavior (MAC) is represented by a small set of parameters. We extensively validate the model by ad-hoc network simulations that include all the details of the widely used IEEE 802.11 MAC-protocol. Further we show that the overall flow transfer time of a multi-hop flow, which consists of the sum of the delays at the individual nodes, improves by granting a larger share of the medium capacity to the bottleneck node. Such alternative resource sharing strategies can be enforced in real systems by deploying the recently standardized IEEE 802.HE MAC-protocol. We propose a mapping between the parameter settings of IEEE 802. HE and the fluid-flow model, and validate the fluid-flow model and the parameter mapping with detailed system simulations. © Springer-Verlag Berlin Heidelberg 2007.
Topics
TNO Identifier
240353
Publisher
Springer
Source title
Managing Traffic Performance in Converged Networks. 20th International Teletraffic Congress, ITC20 2007, Ottawa, Canada, June 17-21, 2007. Proceedings
Editor(s)
Masdon, L.
et al
et al
Place of publication
Berlin : [etc]
Pages
321-324
Files
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