Frequency hopping code division multiple access system and method
First Claim
1. A communication system having a base station for communication with multiple remote units, the system comprising:
- a base station utilizing a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area, said coverage area divided into N concentric regions which in turn are divided into M sectors to define M*N concentric sector areas, each concentric sector area being assigned one of said plurality of frequency sets such that for any given concentric sector area a different frequency set is assigned which is different than the frequency sets assigned to all other adjacent concentric sector areas;
said base station including means for communicating data to a remote unit over the set of frequencies associated with the respective concentric sector area as the remote unit travels from one concentric sector area to another; and
at least one remote unit having means for communicating with said base station over the set of frequencies associated with the respective concentric sector area as the remote unit travels from one concentric sector area to another.
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Abstract
A frequency hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units. The frequency-hopping-communications system includes a plurality of base stations for communicating base-message data to the plurality of remote units. Each of the base stations has a coverage area divided into a plurality of concentric regions with each concentric region assigned one of the N sets of frequencies. For communicating with a selected-remote unit located within a particular-concentric region, each base station has a frequency-hopping device for frequency hopping the base-message data over a set of frequencies assigned to the particular-concentric region, thereby generating a frequency-hopped signal, a controller, responsive to the selected-remote unit being located in the particular-concentric region, for controlling the set of frequencies use by said frequency-hopping device, and a base antenna coupled to the power amplifier for radiating the frequency-hopped signal. Each of the remote units has a receiver for recovering the base-message data from the frequency-hopped signal.
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Citations
20 Claims
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1. A communication system having a base station for communication with multiple remote units, the system comprising:
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a base station utilizing a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area, said coverage area divided into N concentric regions which in turn are divided into M sectors to define M*N concentric sector areas, each concentric sector area being assigned one of said plurality of frequency sets such that for any given concentric sector area a different frequency set is assigned which is different than the frequency sets assigned to all other adjacent concentric sector areas; said base station including means for communicating data to a remote unit over the set of frequencies associated with the respective concentric sector area as the remote unit travels from one concentric sector area to another; and at least one remote unit having means for communicating with said base station over the set of frequencies associated with the respective concentric sector area as the remote unit travels from one concentric sector area to another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A base station for a communication system having at least one base station for communication with multiple remote units, the base station comprising:
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means for utilizing a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area, said coverage area divided into N concentric regions which in turn are divided into M sectors to define M*N concentric sector areas, each concentric sector area being assigned one of said plurality of frequency sets such that for any given concentric sector area a different frequency set is assigned which is different than the frequency sets assigned to all other adjacent concentric sector areas; and means for communicating data to a remote unit over the set of frequencies associates with the respective concentric sector area as the remote unit travels from one concentric sector area to another. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A communication method for communicating data between a base station and a remote unit, said base station having a predetermined coverage area, the method comprising the steps of:
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dividing said coverage area into N concentric regions which in turn are divided into M sectors to define M*N concentric sector areas; assigning each concentric sector area one of a plurality of sets of frequencies such that for any given concentric sector area a frequency set is assigned which is different than the frequency sets assigned to all other adjacent concentric sector areas; and communicating with a remote unit over the set of frequencies associated with the respective concentric sector area as the remote unit travels from one concentric sector area to another. - View Dependent Claims (18, 19, 20)
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Specification