Base station, mobile station, communication system, transmission method and reordering method

摘要

A reordering method wherein packets to which numbers indicative of an order have been added are transmitted from a base station to a mobile station and then reordered in the numerical order at the mobile station. There are included a step in which packets, which have not been transmitted to a mobile station, or packets, for which no acknowledgment of successful reception has not been received from the mobile station, are forwarded from a source base station to a destination base station, which then transmits those packets to the mobile station, while packets received from a host station are transmitted to the mobile station; a step in which if the destination base station is to transmit the packets received from the host station to the mobile station out of the order, it adds, to those packets, information indicating that those packets are out of the order; and a step in which the mobile station determines that those out-of-the-order packets are not to be reordered, and then performs a reordering process for the packets to be reordered.