US 6,334,055 B1Granted

Mobile telephony standards converter

AssigneeLucent Technologies Inc.

InventorsWilliam J. Garner, Zhihong Huang, Winston H. Lieu

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Abstract

An adapter/converter circuit converts transmissions by a mobile telephone built for one standard (e.g., PCS) from the telephone transmit/base station receive frequency of that one standard to the telephone transmit/base station receive frequency of another standard (e.g., cellular), and converts transmissions by a base station or similar device (e.g., a base station simulator) from the telephone receive/base station transmit frequency of the one standard to the telephone receive/base station transmit frequency of the other standard. The two frequency conversions occur simultaneously on two parallel legs under the control of a PLL dual frequency synthesizer, which is in turn controlled by user input (in the case where the adapter is used to allow, e.g., PCS telephones to be tested on cellular test equipment) or by the base station (in the case where the adapter is used to allow, e.g., PCS telephones to be used with a cellular base station).

Claims7

Dependent claims

A standards converter for allowing a mobile telephone 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, to communicate with a base unit which transmits, at any one time, on one transmit frequency of a second set of transmit frequencies and which receives, at any one time, on one receive frequency of a second set of receive frequencies, said converter comprising:

a first interface which receives from said mobile telephone a signal at said one transmit frequency of said first set of transmit frequencies and which transmits to said mobile telephone a signal at said one receive frequency of said first set of receive frequencies;
a second interface which receives from said base unit a signal at said one transmit frequency of said second set of transmit frequencies and which transmits to said base unit a signal at said one receive frequency of said second set of receive 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 transmit frequency of said second set of transmit 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 receive frequencies;
and
a second frequency converter along said second propagation path which converts said one transmit frequency of said second set of transmit frequencies to a corresponding frequency of said first set of receive frequencies.

4 more elements

Dependencies are inferred from the claim text.