Patent ID: 8488555

Claim:
A packet priority control method for a specific mobile device to perform a handover in a wireless communication system in which a base station calculates a wireless transmission priority for each predetermined data packet received from a base station control device based on a station retention time from a reception time at which the data packet is received until a current time, the packet priority control method comprising: inter-base-station packet transferring including a handover-source base station transferring a data packet destined to the mobile device received from the base station control device to a handover-destination base station as an inter-base-station transfer packet during a stopping period for which the handover-source base station stops a wireless transmission of a data packet to the mobile device; and transmission controlling including the handover-destination base station calculating a wireless transmission priority for the inter-base-station transfer packet based on a first retention time that is a station retention time in the handover-destination base station and a second retention time that is an estimated value of a retention time in the handover-source base station, wherein the calculating includes adding the second retention time to the first retention time to obtain a total retention time, and obtaining the wireless transmission priority based on the total retention time.