Coexistence Study in the 2500-2690 MHz Band between WiMAX and WCDMA Systems

WiMAX (802.16e) has been recognized as an official member of IMT-2000 by WRC-07, which permits its use of 3G systems bandwidth, including 2500 to 2690 MHz. The work of coexistence interference analysis between WiMAX and WCDMA systems in 2.5 GHz band is a potential research field. This paper presents several interference paths, investigates the methods of evaluating two coexisting systems in details, and analyzes necessary assumptions as well as simulation parameters. Some typical interference scenarios in which WiMAX and WCDMA systems are operated on the adjacent frequency bands are simulated and discussed from three different respects: separation distances for these two systems, uplink power control mechanisms of WiMAX system and frequency reuse schemes. It is shown that when uplink power control methods or frequency reuse scheme is implemented, the interference from WiMAX mobile stations to WCDMA system is not quite severe. At last, a few suggestions and mitigation technologies are introduced to better implement these two systems.