A new mobile subscriber set for high-capacity land mobile communication system

The authors describe the design concept, configuration, and characteristics of a new mobile subscriber set (MSS) for NTT´s new high-capacity land mobile communication system. In spite of many complicated features, such as diversity reception, cochannel interference detection, automatic frequency control, and system compatibility, the new MSS has been made smaller than the conventional MSS through common use of radio portions and software modules in addition to redevelopment of LSIs. The standby and transmitting time of the MSS in battery operation was drastically improved as against the conventional MSS by thorough reduction of component current drain and application of intermittent reception. The sets have worked well in Tokyo´s high-capacity system (MCS-L2) and over the whole area of Japan (MCS-L1)