Design of a single phone cellular system with underlying indoor microcells at initial stages of deployment

A single phone cellular system having underlying microcells inside buildings and employing the same frequency channels used by conventional cellular telephones has been reported successful on operational tests. All previous analyses done on such system assumed the most heavy case of interference, i.e., the microcells are fully deployed and operational all over the cellular service area. However, only a few systems are installed initially and the analysis results are different from those in a complete final system. This paper shows simplified conceptual system design formulas and compares the microcell radius of the single phone system in its initial stage with that of a system fully deployed. The microcell radius in this initial stage was found to be very close to that in a fully deployed system and they can be considered equal. The use of the single phone cellular system implies an increase in the cluster size. However, it is shown that for initial stages of system deployment the changes on cluster size are minimal. It is also shown that the spectrum efficiency enhancement obtained from this system on an initial stage is larger as that of a fully deployed one, given that at least one cluster of microcells is installed