Multi-band wireless radiotelephone operative in a plurality of air interface of differing wireless communications systems
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United States of America Patent
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Apr 11, 1995
Grant Date -
N/A
app pub date -
Aug 4, 1993
filing date -
Aug 4, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A universal wireless radiotelephone communication apparatus is operative in both a first radiotelephone communication system including a first base station having a wide area of coverage, transmitting radiotelephone signals at a first band of frequencies and in a second radiotelephone communication system including a second base station having a localized area of coverage, transmitting radiotelephone signals at a second band of frequencies higher than said first band of frequencies. The second band of frequencies is optimally selected with an offset of less than twice a frequency contained within said first band. The wireless radiotelephone communication apparatus has a common baseband circuitry for operating with both the first base station covering the wide area and with the second base station covering the local area. The common baseband circuitry processing received radiotelephone signals from both base stations and processes signals generated by a user of the handset for transmission to either of these base stations.
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