Mobile station, base station, maintenance device, mobile communication system and handover position determination method

A handover position determination method for a mobile communication system comprising a mobile station to measure received quality of downlink signals received from a base station, the base station to measure received quality of uplink signals received from the mobile station, and a maintenance device to monitor states of the mobile station and the base station, the handover position determination method comprising:

• a measurement result request step performed by the mobile station of transmitting a measurement result request to a handover destination base station to be connected next, the mobile station being currently connected to a handover source base station;
• a handover destination base station transmission step performed by the handover destination base station of, when the handover destination base station receives the measurement result request, transmitting to the handover source base station, a first measurement result that includes received quality information on the measurement result request and time information on time of measuring received quality of the measurement result request;
• a handover source base station transmission step performed by the handover source base station of transmitting, to the mobile station, a second measurement result that includes
• received quality information on an uplink signal at the handover source base station at a time indicated by the time information on the first measurement result and
• the received quality information on the measurement result request of the handover destination base station included in the first measurement result;
• a measurement information storage step performed by the mobile station of
• acquiring
• position information at a time of transmitting the measurement result request,
• received quality information that is measurement result of received quality of downlink signals received from the handover source base station and the handover destination base station, and
• from the handover source base station, received quality information on uplink signals measured at the handover destination base station and the handover source base station, and
• storing measurement information that is received quality information on signals transmitted and received between the mobile station and the base station;
• and
• a handover position determination step performed by the maintenance device of determining a handover position of the mobile station on the basis of the measurement information acquired from the mobile station.