Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1989-02-06
1990-06-05
Lev, Robert
Telephonic communications
Audio message storage, retrieval, or synthesis
455 33, 379 59, H04B 710
Patent
active
049320491
ABSTRACT:
A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having a different assigned set of transmission frequency channels, are arranged with handoff circuitry for maintaining continuous communication with mobile telephones moving from cell to cell. The system includes at least one cell having a plurality of transmitting and receiving antenna sets. Each set is positioned at a respective antenna sub-site at the perpihery of the cell or other suitable location, and is configured so that propagation and reception of signals is limited to substantially within the boundaries of the cell. Control circuitry monitor the strength of the signal received by each of the antenna sets at each frequency channel in the assigned set. Transmission, at each frequency channel in the assigned set, is confined to the antenna set at one sub-site in the cell having the strongest received signal at each frequency.
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Lev Robert
PacTel Corporation
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