Patent ID: 8964697
Filing Date: 2015-02-24
Classification: H04L,H04W

Abstract:
1. A connection management method in a communication system comprising a mobile terminal capable of establishing a plurality of packet data connections using a plurality of Internet Protocol (IP) addresses; a packet data gateway establishing a packet data connection with the mobile terminal and a mobility management gateway managing connection information on a packet transmission/reception with the mobile terminal, the method being for managing connections when the mobile terminal performs a handover from a multi-address type connection network capable of establishing a packet exchange connection using a plurality of IP address types to a single address type connection network capable of establishing a communication path with a single IP address type only, the method comprising: a detection step of detecting, by the mobile terminal, a handover from the multi-address type connection network to the single address type connection network; a temporary connection establishment step of establishing, by the mobile terminal, on a basis of a result of the detection step, a temporary connection via a single address type connection network with the mobility management gateway to maintain a communication state before the handover; a packet data gateway-to request transmission step of transmitting, by the mobile terminal, after the temporary connection establishment step, a request to maintain a packet data connection before the handover to the packet data gateway using the temporary connection; a mobility management gateway-to request transmission step of determining, by the packet data gateway receiving the request, whether or not to transmit the received request to the mobility management gateway, and when the packet data gateway determines that the request is to be transmitted to the mobility management gateway, transmitting the received request to the mobility management gateway; and a modification step of modifying, by the mobility management gateway, the connection information on a packet transmission/reception with the mobile terminal on a basis of information included in the request.