A COMMON AIR INTERFACE BETWEEN WIDE-AREA CORDLESS TELEPHONE AND URBANCELLULAR RADIO - FREQUENCY CHANNEL DOUBLY-REUSED CELLULAR-SYSTEMS

This paper proposes a new system [1] in which the frequency channel of the wide-area cordless telephone is reused doubly by the frequency ch annel employed in the urban cellular mobile telephone with a weak powe r. A condition is imposed whereby the two systems can operate with equ al telephone qualities when cochannel interferences exist between two systems. The radius of the microcell and the weak power are analyzed a nd completed. According to the analysis, the theoretical limit of the spectrum efficiency of the new system is doubled compared to the syste m where the frequency bands of the two systems are placed independentl y in adjacent bands (AB) [2, 3]. To realize the cooperation between th e wide-area cordless telephone and the urban cellular mobile telephone on the equally coexistent condition, an autonomous spectrum distribut ed management system is proposed in principle [3] which can maintain i n a simple way the cochannel interference sharing.