A common air interface between wide-area cordless telephone and urban cellular radio: Frequency channel doubly-reused cellular systems

• Published in: Electronics & communications in Japan. Part 1, Communications Communications, 1994-08, Vol.77 (8), p.101-112
• Main Authors: Kinoshita, Yasuaki, Tsuychiya, Toshiki, Ohnuki, Sinya
• Format: Article
• Language: English
• Subjects: air interface; cellular telephone; Cordless telephone; spectrum utility efficiency
• ISSN: 8756-6621; 1520-6424
• DOI: 10.1002/ecja.4410770810

This paper proposes a new system [1] in which the frequency channel of the wide‐area cordless telephone is reused doubly by the frequency channel employed in the urban cellular mobile telephone with a weak power. A condition is imposed whereby the two systems can operate with equal telephone qualities when cochannel interferences exist between two systems. The radius of the microcell and the weak power are analyzed and completed. According to the analysis, the theoretical limit of the spectrum efficiency of the new system is doubled compared to the system where the frequency bands of the two systems are placed independently in adjacent bands (AB) [2, 3]. To realize the cooperation between the wide‐area cordless telephone and the urban cellular mobile telephone on the equally coexistent condition, an autonomous spectrum distributed management system is proposed in principle [3] which can maintain in a simple way the cochannel interference sharing.