COMPARISONS OF MULTIPLE-ACCESS SCHEMES FOR PERSONAL COMMUNICATION-SYSTEMS IN A MIXED CELLULAR ENVIRONMENT

The paper deals with the evaluation of performances of packet reservat ion multiple access (PRMA) and code division multiple access (CDMA) in a mixed cellular environment, composed by a regular grid of macrocell s plus microcells deployed in the most congested areas. This investiga tion aims at evaluating the impact of the different interference mecha nisms on traffic performance and bases on the comparison between two t echnical solutions proposed in literature. The approach is quite innov ative since the analysis is carried out considering realistic spatial traffic statistics, which are characterized, even with a nominally uni form user distribution, by fluctuations resulting in uneven traffic lo ads on different cells. Different propagation models for macrocells an d microcells have been adopted.