A method for transmitting data between at least one central office and a plurality of mobile radio stations via a relay station by a time multiplex transmission procedure in which signals are transmitted in a succession of time frames structure and the central office transmits on a first frequency to...http://www.google.co.uk/patents/US4356484?utm_source=gb-gplus-sharePatent US4356484 - Method for transmitting data in a time multiplex transmission
