Evaluation of channel allocation with distributed control scheme for street microcellular systems

Distributed control is indispensable to any personal communication service. However, distributed control makes it difficult to obtain the required frequency bandwidth considering the offered traffic and interference because there is no definite relationship between the base stations and the channels that they use. This paper proposes the virtual frequency reuse pattern, namely a virtual cluster size. The virtual cluster size gives the number of required control channels on a TDMA frame, assuming that once selected, the base station permanently uses the same control channel. The upper bound and the lower bound of the virtual cluster size are obtained theoretically and the practical virtual cluster size is obtained by computer simulations. Traffic channel assignment by dynamic channel allocation is designed for street microcellular systems as well. Both synchronized and asynchronized TDMA frames between base stations are discussed in this study. The optimum radio access method (TDMA/TDD or FDD) following all system conditions is reported in this paper