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AssigneeCirrus Logic, Inc.
InventorsSteven H. Gardner, Sheldon L. Gilbert, Carl Thomas Hardin, James E. Petranovich
Estimating the term…
A time sharing method and apparatus for frequency reuse in cellular communication systems. Frequency reuse is enhanced by synchronizing cell transmit/receive base stations in a cellular system to a common time base, and then sharing the available frequencies via allocated time slots. Cells using the same frequency that may interfere with each other are activated only during selected time intervals while same-frequency cells nearby are deactivated. The deactivated cells are then in turn activated while previously activated same-frequency cells nearby are deactivated. The frequency time slots may be of equal length, or longer time slots may be allocated to cells having higher usage rates, as determined in any of a number of ways. The time slots may be mutually exclusive, or may overlap. The time sharing technique of the present invention allows design of cell systems with many reuse patterns. Several particular cell reuse patterns are disclosed that provide good operational characteristics and low co-channel interference. The invention allows the use of a small number of cellular frequencies in a conventional cellular system without significant alteration of the existing system, and is particularly useful in two-way cellular paging systems. Improved reverse link data throughput is achieved via reuse of the reverse frequency channels.
A method of reusing reverse frequency channels in a cellular communication system having a plurality of cells arranged as a plurality of frequency reuse groups, each reuse group comprising a plurality of associated corresponding time-slotted cell subsets comprising a plurality of associated corresponding cells, each cell in an associated subset assigned an identical forward frequency channel which is unique to the subset within the reuse group corresponding to the subset, the method comprising:
A method of reusing reverse frequency channels in a cellular communication system having a plurality of reverse frequency channels and a plurality of forward frequency channels, the cellular communication system further having a plurality of cells arranged as a plurality of cell groups, each cell group comprising a plurality of associated corresponding time-slotted cell subsets comprising a plurality of associated corresponding cells, each cell in an associated subset assigned one identical forward frequency channel of the plurality of frequency channels which is unique to the cell subset within the cell group, wherein each cell of a corresponding subset is periodically enabled to transmit on its assigned forward frequency channel at least in part only during a time period in which no other cell in the corresponding subset is enabled, comprising:
Dependencies are inferred from the claim text.