Performance of a distributed dynamic channel assignment algorithm incorporating power control in a wireless environment

Abstract

A distributed dynamic channel assignment (DDCA) scheme, entitled UFDMA PDA PC has been developed which incorporates power control and which is designed to substantially reduce call dropping without the need for intra-cell handoffs. It has been shown that the scheme increases capacity by at least a factor of 3 compared with the best previous non-power control UFDMA scheme. The scheme has been developed with the aid of mathematical analysis and a pictorial model. Results are presented which show that call dropping may be virtually eliminated in a correlated shadowing environment and median transmitter power is reduced by 15 dB. Discussion of the different call dropping mechanisms are presented and it is suggested that the residual level of call dropping is now a result of multiple additional call arrivals close to an active link. Methods to make further reductions in the call dropping probability are also explored.