An Interference-Aware Admission Control Design for Wireless Mesh Networks
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Research Article An Interference-Aware Admission Control Design for Wireless Mesh Networks Devu Manikantan Shila and Tricha Anjali Department of Electrical and Computer Engineering, 3300 S Dearborn Street, Chicago, IL 60616, USA Correspondence should be addressed to Devu Manikantan Shila, [email protected] Received 7 October 2009; Revised 1 January 2010; Accepted 27 April 2010 Recommended by Ping Wang In this paper, we present IAC, an interference aware admission control algorithm for use in wireless mesh networks. The core concept of IAC is to use a low overhead dual threshold based approach to share the bandwidth information with its neighbors in the interfering range. As a result, IAC guarantees that the shared wireless bandwidth is not overutilized and the quality of all existing flows are preserved. Moreover, IAC takes into account the intraflow interference effect to estimate the bandwidth consumption of the flow in a multihop path. We have further proposed two approaches of bandwidth allocation, FCFS and MCU, and demonstrated that proper tuning of thresholds can lead to high performance of both schemes. Simulation results illustrate that IAC effectively limits the overutilization of channel resources which in turn results in high throughput, low delay and low packet loss rate for all admitted flows. Copyright © 2010 D. Manikantan Shila and T. Anjali. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
1. Introduction Recent advances in wireless network communications have lead to the development of Wireless Mesh Networks (WMNs) [1–3], a promising technology that has the potential to provide wireless services in locations where there is currently little or no infrastructure. In WMNs, a collection of wireless mesh routers, usually employing IEEE 802.11based commodity hardware operating in ad hoc mode, provides network access to the wireless clients. However, communications between mesh routers are realized by radio transmissions usually in a multihop fashion. One or more mesh routers in the network are connected to the Internet and serve as gateways to provide Internet connectivity for the entire mesh network. The existence of a wireless backhaul provides many advantages for mesh networks like market coverage, scalability, and low upfront cost. As WMNs grow in popularity with numerous public and private deployments [4–6], the demand for multimedia services, such as Voice over IP (VoIP), Video on Demand (VoD), and interactive gaming, along with traditional data services is also increasing rapidly. These real-time services have stringent Quality of Service (QoS) requirements (e.g.,
low packet loss ratio and delay) for effective communication as compared to best-effort services that are tolerant to changes in bandwidth and delay [7–11]. In spite of the multiple advantages, it is fairly difficult to maintain a desired level of QoS for multimedia applications
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