GATEWAY DEVICE, MOBILE COMMUNICATION SYSTEM, MOBILE TERMINAL, METHOD FOR CONTROL OF PACKET TRANSFER, METHOD FOR CONTROL OF MOBILE TERMINAL, AND NON-TEMPORARY COMPUTER-READABLE MEDIUM

摘要

A passing packet determination unit (112) included in an anchor GW (100A) performs control, on the basis of a transfer policy, as to whether or not to transfer a layer 3 packet arriving from an external network (20), to a downlink transmission path established between the passing packet determination unit (112) and a mobile terminal (700). In addition, a transfer policy control unit (111), in order to start transfer of a multicast packet or broadcast packet to the mobile terminal (700) by means of the downlink transmission path, modifies the transfer policy in response to receiving a predetermined layer 3 packet from the mobile terminal (700) in such a way that the multicast packet or broadcast packet is transferred to the mobile terminal (700) by means of the downlink transmission path.