Code division multiple access (CDMA) inbound messaging system utilizing re-use of sequences
First Claim
1. A method for distributing at least a portion of a plurality of seeds which are used by pseudo-noise (PN) generators to spread and despread spread spectrum signals in a spread spectrum code division multiple access (CDMA) communication system comprising base stations for communicating with portable transceivers, the communication system further comprising a central controller having a memory for storing the plurality of seeds in a database and a processing unit for controlling operation of the base stations and distribution of the at least a portion of the plurality of seeds to the bases stations via a data port, the method comprising the steps of:
- at the central controller(a) receiving a seed request from a first base station coupled to the central controller by the data port,(b) determining which of the plurality of seeds stored in the database are available seeds that are used for communication between the first base station and one or more portable transceivers within an associated coverage area thereof without interfering with other base stations within the communication system, and(c) providing a subset of the available seeds to the data port for transfer to the first base station; and
at the first base station(d) subsequently transmitting the subset of the available seeds to the one or more portable transceivers for use in generating uniquely identifiable spread spectrum signals for reception by the first base station.
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Accused Products
Abstract
A central controller (10) controls the operation of a code division multiple access (CDMA), spread spectrum communication system, which includes base stations (15) and portable transceivers (20) for communicating with the base stations (15). The central controller (10) stores a plurality of seeds, which are used by the portable transceivers (20) in generating pseudo-noise (PN) sequences, and, in response to requests from base stations (15), the central controller (10) distributes at least a portion of the assignable seeds to each of the requesting base stations (15). The base stations (15) that have received seeds from the central controller (10) subsequently transmit the seeds over the air to the portable transceivers (20) within their respective coverage areas. The portable transceivers (20) then utilize the seeds to generate spread spectrum signals for reception by a closest base station (15) having a coverage area in which they are located.
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Citations
13 Claims
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1. A method for distributing at least a portion of a plurality of seeds which are used by pseudo-noise (PN) generators to spread and despread spread spectrum signals in a spread spectrum code division multiple access (CDMA) communication system comprising base stations for communicating with portable transceivers, the communication system further comprising a central controller having a memory for storing the plurality of seeds in a database and a processing unit for controlling operation of the base stations and distribution of the at least a portion of the plurality of seeds to the bases stations via a data port, the method comprising the steps of:
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at the central controller (a) receiving a seed request from a first base station coupled to the central controller by the data port, (b) determining which of the plurality of seeds stored in the database are available seeds that are used for communication between the first base station and one or more portable transceivers within an associated coverage area thereof without interfering with other base stations within the communication system, and (c) providing a subset of the available seeds to the data port for transfer to the first base station; and at the first base station (d) subsequently transmitting the subset of the available seeds to the one or more portable transceivers for use in generating uniquely identifiable spread spectrum signals for reception by the first base station. - View Dependent Claims (2, 3, 4)
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5. A central controller for distributing a plurality of seeds stored by the central controller to base stations for transmission therefrom to portable transceivers which have pseudo-noise (PN) generators which use the plurality of seeds to generate and transmit spread spectrum signals which are received by the base stations, wherein the central controller, base stations, and portable transceivers are included in a code division multiple access (CDMA) communication system, the central controller comprising:
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a database for storing the plurality of seeds; a data port for receiving a seed request from a first of the base stations; and a processing unit, coupled to the database and the data port, for determining by reference to the database, which, if any, of the plurality of seeds are suitable for utilization by one or more portable transceivers located within the coverage area of the first base station without interfering with other base stations in the communication system, and for retrieving from the database one or more of the plurality of seeds that are to be utilized by the one or more portable transceivers located within the coverage area of the first base station without interfering with the other base stations, wherein the retrieved seeds are provided to the data port for subsequent transmission therefrom to the first base station. - View Dependent Claims (6, 7, 8)
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9. A spread spectrum, code division multiple access (CDMA) communication system for providing two-way communication, the communication system comprising:
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base stations for receiving spread spectrum signals over the air and for generating seed requests depending upon the number of received spread spectrum signals; and a central controller, coupled to and controlling the base stations and having a memory in which a plurality of seeds are stored, the plurality of seeds are used by pseudo-noise (PN) generators within the base stations for generating PN sequences for despreading signals which have been spread using the plurality of seeds by pseudo-random noise (PN) generators within portable transceivers the central controller selectively distributing a portion of the plurality of seeds to each of the base stations in accordance with the seed requests. - View Dependent Claims (10, 11, 12)
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13. A communication system for providing two-way spread spectrum, code division multiple access (CDMA) communication, the communication system comprising:
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a portable transceiver for using a pseudo-noise (PN) generator to generate spread spectrum signals using at least one seed; base stations for transmitting and receiving spread spectrum signals, wherein a first of the base stations provides the portable transceiver with the at least one seed and receives the spread spectrum signals generated by the portable transceiver; and a central controller coupled to and controlling the base stations, the central controller comprising; memory means for storing a plurality of seeds, including the at least one seed provided to the portable transceiver by the first base station, for use in spread spectrum communication; determining means for determining which one of the base stations, other than the first base station, is a second base station, wherein communications between the first base station and the portable transceiver will not interfere with communications within the coverage area of the second base station when the second base station also utilizes the at least one seed provided to the first base station; and processing means coupled to the memory means for also providing the at least one seed to the second base station for use thereby in spread spectrum communication.
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Specification