WiMAX Metro Area Mesh Networks: Technologies and Challenges
MIMO-OFDM technology has emerged as a compelling high-speed solution for the next-generation wireless networks. The IEEE 802.16 standard-based WiMAX system will deploy MIMO-OFDM technology in the broadband wireless access (BWA) and backhaul markets that otherwise depended mostly on proprietary solutions. Standard-based solutions result in inexpensive devices and encourage large-scale deployments, bringing down the cost of the technology to end users, yet making it profitable for service providers and equipment manufacturers. Of the two deployment modes specified in the WiMAX system, mesh mode is currently optional while point-to-multipoint mode is mandatory. In this chapter, we present an overview of the PHY and medium access control (MAC) layer technologies deployed in the WiMAX system and examine the prospects and challenges of mesh operations using them. One of the main impediments for mesh operation in the WiMAX system is that network operators operating the system in licensed spectrum are not keen to provide separate radio channels for access and mesh relay services, as this reduces the numbers of users serviced per spectrum allocation. We discuss in this chapter, an interesting alternative approach that uses the concept of MIMO-multiplexing relaying at each mesh node to provide different links for the access and mesh relaying services on the same radio channel. This approach is cost-effective, and encourages more widespread WiMAX mesh network deployments.
KeywordsMedium Access Control Mesh Network Wireless Mesh Network Mesh Node OFDM Symbol
Unable to display preview. Download preview PDF.
- 6.Eklund C. et al. 2006.WirelessMANInside the IEEE 802.16 Standard for Wireless Metropolitan Networks, IEEE Press, New York,Google Scholar
- 8.H. D. Goldman, R. C. Sommer, An analysis of cascaded binary communication links, IRE Trans. Commun. Syst., 291–299, 1962.Google Scholar
- 10.IEEE Standard for Local and Metropolitan Area Networks – Parts 16: Air Interface for Fixed Broadband Wireless Access System, 2004.Google Scholar
- 11.IEEE Standard for Local and Metropolitan Area Networks – Parts 16: Air Interface for Fixed and Mobile Broadband Wireless Access System Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands, 2006.Google Scholar
- 12.T. Issariyakul, E. Hossain, Analysis of end-to-end performance in a multi-hop wireless network for different hop- level ARQ policies, Proc. Globecom'04, 3022–3026, 2004.Google Scholar
- 13.Kim, D. Ganz, A. 2005.Fair and Efficient Multihop Scheduling Algorithm for IEEE 802.16 BWA Systems, Proc. IEEE Int'l Conf. Broadband Netw., 2:895–901,Google Scholar
- 14.L. Litwin, M. Pugel, The principles of OFDM, RF Signal Processing, 30–48, 2001 (available online at: rfdesign.com).Google Scholar
- 15.MOTOROLA North America, Motorola Inc., 2004, www.motorola.com/mesh.
- 16.Nee, R. Wild, A. 1998.Reducing the peak-to-average power ratio of OFDM, IEEE VTC '98,3:2072–2076,Google Scholar
- 17.M. Settembre, M. Puleri, S. Garritano, P. Testa, R. Albanese, M. Mancini, V. L. Curto, Performance analysis of an efficient packet-based IEEE 802.16 MAC supporting adaptive modulation and coding, Proc. IEEE International Symposium Computer Networks, 11–16, 2006.Google Scholar
- 18.A. I. Sulyman, M. Ibnkahla, Performance analysis of nonlinearly amplified M-QAM signals in MIMO channels, Proc., IEEE ICASSP'04, Montreal, Canada, 2004.Google Scholar
- 19.H.-Y. Wei, S. Kim, S. Ganguly, R. Izmailov, Seamless handoff support in wireless mesh networks, Proc. IEEE Workshop Operator-Assisted (Wireless Mesh) Community Networks, 1–8, 2006.Google Scholar