Cordless telephone system and its propagation characteristics

Abstract

The cordless telephone system is designed to replace the indoor portion of a subscriber line with a radio so that a telephone set can be carried about freely and used anywhere within a limited service area. Therefore, it can be considered to be a partial realization of a portable telephone system. A description of the cordless telephone system using the 250-MHz and 400-MHz bands, which is scheduled to be put into commercial service is presented. The propagation characteristics, such as indoor propagation and urban area propagation for short distances, which are important for the system are also presented. Finally, the ultrasmall zone (minicellular zone) composition, which is newly employed in the system, is described.