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Two main technologies are competing for the International Mobile Telecommunications (IMT)-Advanced initiative: WiMAX and LTE. This comparison reviews their development and deployment and providesan outlook on their adoption as 4G technologies.

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Abstract-Broadband wireless access networks have received tremendous attention in terms of research and development in the recent years. There have also been test networks deployed in many cities across the globe. In the IEEE 802.16j standard, relay stations (RS) play a promising role of extending the range of a base station (BS) especially in rural areas where it is difficult to install a large number of BSs with wired connections. Therefore, the planning of the number and location of relay stations is an important step in their deployment. In this paper, we address the problem of relay station planning in wireless broadband networks and we present an optimization for the RS planning problem in wireless broadband networks.