llandover Performance Improvement by Adaptive Hystresis Margin Selection based on Estimation of Fading Characteristics

The performance of a proposed handover algorithm based on both adaptive averaging and adaptive hysteresis margin assignment is evaluated. The algorithm performs handoff through the conven-tional RSS based algorithm by mitigating received signal strength fluctuations and adaptively assignment of hysteresis margin. The Cross over point and number of handoffs are used as criteria for performance. Numerical results are presentecl to demonstrate the feasibility of this algorithm. The proposed algorithm ,J compared with an algorithm based on absolute and relative signal strength measurements with a fixed hysteresis margin assignment. Best combination of averaging and adaptive hysteresis margin assignment ,s robust to variation of fading c har act er istic s of environment.

Keywords:

handover , shadow and fast fading , adaptive averaging