Patent ID: 6330449
Filing Date: 2001-12-11
Classification: H04W

Abstract:
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.