Patent ID: 8355383

Claim:
A method of coordinating handover of a mobile station (MS) from a serving base station (BS) to a target base station in a mobile communication system supporting both MS-initiated handover and BS-initiated handover, wherein the method includes: in the case of BS-initiated HO, said base station (BS) sending to the mobile station (MS) or, in the case of MS-initiated HO, said mobile station (MS) sending to the base station (BS), a message (MOB_BSHO-REQ; MOB_MSHO-REQ) indicating a target base station for the mobile station (MS) to attempt a handover; both in the case of BS-initiated handover and in the case of MS-initiated handover, said mobile station (MS) sending an information message (MOB_HO-IND) indicating the base station to which the handover was attempted; said serving base station (BS) sending to the mobile station (MS) an indication message (MOB_BSHO-REQ; MOB_BSHO-RSP) indicating a target base station for the mobile station (MS) to attempt handover; checking if handover trigger events are detected for base stations different from said target base station indicated in said indication message (MOB_BSHO-REQ; MOB_BSHO-RSP); if no such trigger events are detected, said mobile station (MS) attempting the handover to said target base station indicated in said indication message (MOB_BSHO-REQ; MOB_BSHO-RSP); and if any such trigger events are detected for a target base station different from said target base station indicated in said indication message (MOB_BSHO-REQ; MOB_BSHO-RSP), said mobile station (MS) attempting the handover to said different target base station (B) for which trigger events were detected.