Wireless communication terminal, method, program, recording medium, and wireless communication system

摘要

A wireless communication terminal (1) which performs handover control of wireless base stations acquires a layer 2 address concerning a new wireless base station (3) from a wireless communication interface unit (1A) before handover. A presence confirmation request transmitting unit (1D) transmits a presence confirmation request message to the layer 2 address acquired by an address acquisition unit (1B) via a currently connected wireless base station (2). Based on the presence confirmation response message reception result of a presence confirmation response receiving unit (1E), a subnet determination unit (1F) determines whether the new wireless base station (3) belongs to the same subnet as that of the wireless communication terminal (1).

主权项

1. A wireless communication terminal which determines, before a handover, whether a wireless base station as a handover candidate belongs to the same subnet as that of the currently connected wireless base station, comprising:
an address acquisition unit which acquires, via a wireless communication interface unit, a layer 2 address of a wireless communication interface of a new wireless base station different from a currently connected wireless base station; a presence confirmation request generation unit which generates a presence confirmation request message by designating the acquired layer 2 address as a destination address, and one of a broadcast address and a multicast address as a layer 3 address; a presence confirmation request transmitting unit which transmits, via the currently connected wireless base station, the presence confirmation request message specifically to the new base station, whose IP address is unknown to the terminal, by using the layer 2 address and the layer 3 address; a presence confirmation response receiving unit which receives a presence confirmation response message for the presence confirmation request message; and a subnet determination unit which, when said presence confirmation response receiving unit has received the presence confirmation response message replied from the new wireless base station in response to a match between the destination address and the layer 2 address, determines that the new wireless base station belongs to the same subnet as that of the currently connected wireless base station, and when said presence confirmation response receiving unit has not received the presence confirmation response message, determines that the new wireless base station belongs to a subnet different from that of the currently connected wireless base station.