FIELD: cellular communication systems. SUBSTANCE: communication network user establishes communication by means of mobile station through single base station. Communication network has first mobile communication switching center to control communications through first group of base stations and second mobile communication switching center to control communications through second group of base stations. Network also has base station rendering services and controlled by first mobile communication switching center for servicing first intermediate service area using first pseudonoise code. EFFECT: enhanced reliability of service transmission in response to call between base stations of different systems. 9 cl, 6 dwg
