Patent ID: 7295842
Filing Date: 2007-11-13
Classification: H04W

Abstract:
1. A handover method in mobile communication system, comprising the step of: A) before handover, measuring signals of adjacent cells by a mobile terminal while maintaining communication between a certain handover-forward base station and the mobile terminal, and confirming candidate handover target base stations to be switched to by the mobile terminal; B) sending a measurement report of the handover target base stations satisfying a handover decision criterion to the network by the mobile terminal; C) sending a handover command to the mobile terminal by the network when the network determining to the perform handover according to the handover decision criterion; D) handover directly to the handover target base station according to the handover command by the mobile terminal; E) releasing the communications link between the mobile terminal and the handover-forward base station; and, between Steps B and C, further carrying out a pre-synchronization procedure between the mobile terminal and the handover target base station, comprising the steps of: sending a training sequence to the handover target base station by the mobile terminal while the mobile terminal is sending the measurement report to network, after the handover target base station receives the training sequence, returning a training sequence response message to the mobile terminal by the handover target base station; and maintaining open-loop or closed-loop uplink synchronization between the mobile terminal and the handover target base station.