Patent ID: 6181951
Filing Date: 2001-01-30
Classification: H04W

Abstract:
Base station apparatus for communicating with a mobile telephone, said mobile telephone being of a first type which transmits, at any one time, on one transmit frequency of a first set of transmit frequencies and which receives, at any one time, on one receive frequency of a first set of receive frequencies, said base station apparatus comprising:a base station unit for communicating with mobile telephones of a second type each of said mobile telephones of said second type transmitting, at any one time, on a respective one transmit frequency of a second set of transmit frequencies and receiving, at any one time, on a respective one receive frequency of a second set of receive frequencies; andan adapter comprising:a first interface which receives from said mobile telephone of said first type a signal at said one transmit frequency of said first set of transmit frequencies and which transmits to said mobile telephone of said first type a signal at said one receive frequency of said first set of receive frequencies,a second interface which receives from said base station unit a signal at said one receive frequency of said second set of receive frequencies and which transmits to said base station unit a signal at said one transmit frequency of said second set of transmit frequencies,a first propagation path which propagates said signal at said one transmit frequency of said first set of transmit frequencies from said first interface to said second interface,a second propagation path which propagates said signal at said one receive frequency of said second set of receive frequencies from said second interface to said first interface,a first frequency converter along said first propagation path which converts said one transmit frequency of said first set of transmit frequencies to a corresponding frequency of said second set of transmit frequencies, anda second frequency converter along said second propagation path which converts said one receive frequency of said second set of receive frequencies to a corresponding frequency of said first set of receive frequencies.