Analysis of Frequency Reuse and Throughput Enhancement in WiMAX Systems

The WiMAX (IEEE 802.16e-2005) standard supports fractional frequency reuse concept. To implement this idea, the WiMAX standard has proposed the concept of zones where different frequency reuse factors (FRFs) are employed. Here, each cell/cluster operates with multiple zones where different FRFs are used. The zone of operation for each user can be either permanently fixed or determined dynamically. The dynamic assignment of the zone can potentially utilize the bandwidth efficiently and improve the system throughput. Dynamic zone selection schemes based on the two metrics namely radio distance and bandwidth efficiency are proposed in this paper. The impact of the dynamic zone selection scheme on throughput is studied and compared with the fixed reuse zone schemes.