Microcell system in digital cellular
First Claim
1. In a cellular telephone system wherein a plurality of contiguous cells, each having an assigned set of transmission frequencies, are arranged with handoff means for maintaining continuous communication with mobile telephones moving from cell to cell;
- a cell having a plurality of antenna sets, each set being positioned and having transmitting and receiving means directionally configured to limit propagation of signals substantially to a zone within the boundaries of said cell;
means for assigning at least one of the assigned transmission frequencies of the assigned set thereof to more than one mobile telephone located in said cell including means for allocating first and second of a plurality of characteristic information signals within said one frequency respectively corresponding to first and second mobile telephones of the plurality of mobile telephones, respectively;
control means including means for monitoring the strength of signals received by each of said antenna sets of said cell; and
means for confining transmission, at said first and second characteristic information signals, to the selected antenna set in said cell having the strongest received signal from said first and second mobile telephones, respectively, to thereby limit transmission of said first and second characteristic information signals to the zones associated with the selected antenna sets.
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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 control for maintaining continuous communication with mobile telephones moving from cell to cell. The system allows multiple access by including assigning at least one of the frequencies in the assigned set of transmission frequencies to more than one mobile telephone. Three embodiments of the multiple access systems are disclosed. In one embodiment, a frequency division multiple access is used. In a second embodiment, a time division multiple access is used. In a third embodiment, a code division multiple access is used.
331 Citations
25 Claims
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1. In a cellular telephone system wherein a plurality of contiguous cells, each having an assigned set of transmission frequencies, are arranged with handoff means for maintaining continuous communication with mobile telephones moving from cell to cell;
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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 of signals substantially to a zone within the boundaries of said cell; means for assigning at least one of the assigned transmission frequencies of the assigned set thereof to more than one mobile telephone located in said cell including means for allocating first and second of a plurality of characteristic information signals within said one frequency respectively corresponding to first and second mobile telephones of the plurality of mobile telephones, respectively; control means including means for monitoring the strength of signals received by each of said antenna sets of said cell; and means for confining transmission, at said first and second characteristic information signals, to the selected antenna set in said cell having the strongest received signal from said first and second mobile telephones, respectively, to thereby limit transmission of said first and second characteristic information signals to the zones associated with the selected antenna sets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification