Employing multiple channels in wireless multihop networks is regarded as an effective approach to increas-ing network capacity. This paper presents a centralized quasi-static channel assignment for multi-radio multi-channel Wireless Mesh Networks (WMNs). The proposed channel assignment can efficiently utilize multiple channels with only 2 radios equipped on each mesh router. In the scheme, the network end-to-end traffics are first modeled by probing data at wireless access points, and then the traffic load between each pair of neighboring routers is further estimated using an interference-aware estimation algorithm. Having knowledge of the expected link load, the scheme assigns channels to each radio with the objective of mini-mizing network interference, which as a result greatly improves network capacity. The performance evalua-tion shows that the proposed scheme is highly responsive to varying traffic conditions, and the network per-formance under the channel assignment significantly outperforms the single-radio IEEE 802.11 network as well as the 2-radio WMN with static 2 channels.
References
[1]
Mesh Networks Inc. http://www.meshnetworks.com.
[2]
I. F. Akyildiz, X. D. Wang, and W. L. Wang, “Wireless mesh networks: A survey,” Computer Networks, Vol. 47, No. 4, pp. 445–487, 2005.
[3]
Mesh Networking Forum, “Building the business case for implementation of wireless mesh networks,” Mesh Net-working Forum 2004, San Francisco, CA, October 2004.
[4]
R. Chandra and P. Bahl, “MultiNet: Connecting to multi-ple IEEE 802.11 networks using a single wireless card,” INFOCOM, Vol. 2, pp. 882–893, 2004.
[5]
I. Wormsbecker and C. Williamson, “On channel selec-tion strategies for multi-channel MAC protocols in wire-less ad hoc networks,” IEEE Conference on Wireless and Mobile Computing, Networking and Communications (WiMob’2006), pp. 212–220, 2006.
[6]
J. So and N. Vaidya, “Multi-channel MAC for ad hoc networks: Handling multi-channel hidden terminals using a single transceiver,” MobiHoc’04, May 24–26, 2004.
[7]
A. Raniwala, K. Gopalan, and T. Chiueh, “Centralized channel assignment and routing algorithms for multi- channel wireless mesh networks,” ACM Mobile Com-puting and Communications Review, Vol. 8, No. 2, pp. 50–65, 2004.
[8]
J. Tang, G. Xue, and W. Zhang, “Interference-aware to-pology control and QoS routing in multi-channel wireless mesh networks,” ACM SIGMOBILE, Urbana-Champaign, IL, pp. 68–77, 2005.
[9]
A. Subramanian, H. Gupta, and S. R. Das, “Mini-mum-interference channel assignment in multi-radio wire-less mesh networks,” Proceedings of 4th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks ( SECON’'07), pp. 481–490, June 18–21, 2007.
[10]
“ns-2 simulator,” http://www.isi.edu/nsnam/ns.
[11]
R. Draves, J. Padhye, and B. Zill, “Routing in multi-radio, multi-hop wireless mesh networks,” in Proceedings of ACM MOBICOM, pp. 114–128, September 2004.
[12]
C. Perkins, E. Royer, and S. Das, “Ad hoc on demand distance vector (AODV) routing,” IETF Internet Draft, draft-ietf-manet-aodv2-10.txt, January 24, 2002.
