NDLI: Benefits and limitations of spatial reuse in wireless mesh networks

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Benefits and limitations of spatial reuse in wireless mesh networks

Content Provider	ACM Digital Library
Author	Hiertz, Guido R. Max, Sebastian Weiss, Erik
Abstract	Local area wireless networks are based on the cell topology: Clients associate to one of several access points, which are connected using a wired backbone. As high data rates are only available close to the access points, a dense infrastructure is needed. This results in high costs, especially for the installation of the wired backbone. A wireless mesh network can be used to reduce the deployment costs by connecting only few access points to the backbone; mesh nodes extend the coverage by forwarding data over wireless hops. Since the wireless medium has to be shared by the nodes, multi-hop traffic requires a high capacity. Hence, mechanisms which increase the system capacity in wireless mesh networks are needed. In this paper, we rate how much capacity can be gained by the introduction of spatial reuse. First, a system model of the wireless network is presented. This model includes a stochastic channel behavior and the signal strength/SINR requirements of a link. Additionally, the possibility of link adaption is incorporated. As the exact calculation of the system capacity using this model is NP-hard, we develop and survey heuristics that reduce the complexity. Then, we apply the developed algorithms to evaluate different spatial reuse strategies. An upper bound is given by a network controlled by a omniscient scheduling entity; a lower bound is provided by refraining from spatial reuse. The results show that under the assumptions of the models at least a capacity increase by a factor of two is feasible; under optimal conditions a 12-fold increase is possible.
Starting Page	244
Ending Page	251
Page Count	8
File Format	PDF
ISBN	9781595938510
DOI	10.1145/1298126.1298170
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2007-10-23
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Spatial reuse Capacity Wireless mesh networks
Content Type	Text
Resource Type	Article

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