×

Soft handoff method in a cellular mobile communication system

  • US 6,330,449 B1
  • Filed: 05/14/1999
  • Issued: 12/11/2001
  • Est. Priority Date: 05/29/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. In a code division multiple access cellular mobile communication system, said system including a plurality of mobile stations which receive mobile communication services and manage active sets consisting of received identification signals identifying service areas, a plurality of BTSs (Base Transceiver Stations) for providing the mobile stations moving between a plurality of service areas with said mobile communication services, a BSC (Base Station Controller) connecting said plurality of BTSs with an MSC (Mobile Switching Center) and for providing the mobile stations with a handoff, a soft handoff method for completing a soft handoff when said soft handoff fails because the BSC does not receive an acknowledgement signal comprising the steps of:

  • (i) ordering the plurality of mobile stations by the BSC to report the change of the pilot signal of each sector;

    (ii) reporting said change of pilot signal of each sector to the BSC by the mobile station responsive to said ordering step;

    (iii) checking whether the contents of said second report is identical with a first report included in a previous pilot signal, and if said first and second report are identical, ordering the mobile stations by the BSC to change the active set to correspond with said second report; and

    (iv) reporting a completed change message to said BTS by the mobile station; and

    (v) completing the handoff.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×