×

Telephone registration and cancellation control in a wide area cordless telephone system

  • US 4,833,702 A
  • Filed: 05/13/1988
  • Issued: 05/23/1989
  • Est. Priority Date: 05/13/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for making a registration of a roaming cordless telephone in one of a plurality of local service areas and cancelling the registration, each of said service areas being identified by a unique area code and having a central controller, comprising:

  • (a) transmitting a pre-registration polling signal from said central controller at periodic intervals, said polling signal containing a unique area code identifying the own local service area;

    (b) receiving said polling signal at said roaming cordless telephone and transmitting a pre-registration response signal from said cordless telephone when said area code contained in said received polling signal mismatches a unique area code stored in said telephone;

    (c) making a registration of said cordless telephone in said central controller in response to said pre-registration response signal and transmitting an acknowledgement signal;

    (d) receiving said acknowledgement signal at said cordless telephone, updating said stored area code with an area code contained in said acknowledgement signal and transmitting a post-registration signal from said cordless telephone at periodic intervals; and

    (e) detecting said post-registration signal at said central controller and cancelling said registration in the absence of the detected post-registration signal for a prescribed time interval.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×