Cellular telephone system
First Claim
1. In a cellular telephone system wherein a plurality of contiguous cells, each having a different assigned set of transmission frequencies, are arranged with handoff means for maintaining continuous communication with mobile telephones moving from cell to cell, at least one of said cells comprising:
- a cell having a plurality of antenna sets, each set being positioned and having transmitting and receiving means directionally configured to limit propagation and reception of signals to substantially within the boundaries of said cell,control means including means for monitoring the strength of the signal received by each of said antenna sets at each frequency in the assigned set of transmission frequencies for said cell,and means for confining transmission, at each frequency in the assigned set of transmission frequencies for said cell, to the antenna set in said cell having the strongest received signal at each such frequency.
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Accused Products
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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Citations
15 Claims
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1. In a cellular telephone system wherein a plurality of contiguous cells, each having a different assigned set of transmission frequencies, are arranged with handoff means for maintaining continuous communication with mobile telephones moving from cell to cell, at least one of said cells comprising:
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a cell having a plurality of antenna sets, each set being positioned and having transmitting and receiving means directionally configured to limit propagation and reception of signals to substantially within the boundaries of said cell, control means including means for monitoring the strength of the signal received by each of said antenna sets at each frequency in the assigned set of transmission frequencies for said cell, and means for confining transmission, at each frequency in the assigned set of transmission frequencies for said cell, to the antenna set in said cell having the strongest received signal at each such frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cellular telephone system including a plurality of contiguous cells, each of said cells having different assigned sets of transmission frequencies, said cells being arranged with handoff means for maintaining continuous communication with mobile telephones moving from cell to cell, at least one of said cells comprising,
a cell having a plurality of antenna sets, each set being positioned and having transmitting and receiving means directionally configured to limit propagation and reception of signals to substantially within the boundaries of said cell, control means including means for monitoring the strength of the signal received by each of said antenna sets at each frequency in the assigned set of transmission frequencies for said cell, and means for confining transmission, at each frequency in the assigned set of transmission frequencies for said cell, to the antenna set in said cell having the strongest received signal at each such frequency.
Specification