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Method and apparatus for selecting a receive frequency in a communication receiver

  • US 5,682,147 A
  • Filed: 04/13/1995
  • Issued: 10/28/1997
  • Est. Priority Date: 01/24/1995
  • Status: Expired due to Term
First Claim
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1. A method for selecting a receive frequency in a communication receiver operating in a communication system having a plurality of coverage areas, a coverage area accommodating a transmission of messages to the communication receiver, wherein the coverage area is divided into a plurality of zones, the method comprising the steps of:

  • storing in the communication receiver a primary scan list having a top and a bottom and containing coverage area identification parameters, the primary scan list initially ordered from a most frequented coverage area at the top to a least frequented coverage area at the bottom, the parameters including at least one of a coverage area identifier for identifying a coverage area and a zone identifier for identifying a zone within a corresponding coverage area, and at least one corresponding frequency identifier for identifying the receive frequency on which the communication receiver can receive message information in the corresponding coverage area;

    choosing from the primary scan list a frequency identifier corresponding to the most frequented coverage area;

    tuning the communication receiver to the receive frequency identified by the frequency identifier andthereafter performing baud rate detection on a signal received on the receive frequency, wherein, in response to finding a baud rate matching one of at least one predetermined baud rate, the method further comprises the steps of;

    decoding, from the signal received, at least one of a received coverage area identifier and a received zone identifier in an attempt to find a coverage area match by determining that the at least one of the received coverage area identifier and the received zone identifier matches one of the corresponding coverage area identification parameters stored in the communication receiver; and

    locking the communication receiver to the signal on the receive frequency in response to finding the coverage area match.

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