The Mobile Automatic Telephone System MATS-E is primarily developed for operation in the 900 MHz band allocated for mobile telephone service by the World Administrative Radio Conference (WARC) 1979. This contribution outlines the design principles of MATS-E in comparison to the approaches used in other systems. The paper concentrates on system operation including all functions governed by the specification of the radio interface between mobiles and base stations. The system allows to implement off-air call set-up and call queueing in both directions in order to improve spectrum efficiency, and gives mobile stations full roaming capability throughout the network. A continuous inaudible digital signalling during speech is used for adaptive power control, connection supervision and hand-off, in order to reduce interference and to allow implementation of small cell networks and cell splitting.
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