Method of accessing optimal access network using access gateway in mobile terminal

A method of causing an access gateway to access an optimal access network, comprising:

• determining whether information of an optimal access network for communicating with a mobile terminal is received from a serving access network node;
• if the information of the optimal access network is received, establishing a communication path between the mobile terminal and the optimal access network node;
• and
• if the mobile terminal accesses the optimal access network node, changing a data transmission path to the serving access network node to a data transmission path to the optimal access network node.

A method of accessing an optimal access network in a heterogeneous network system, comprising:

• in a mobile terminal, measuring signal intensities of a serving access network node and at least one adjacent access network node for each predetermined period when the mobile terminal accesses the serving access network node or when the mobile terminal performs handover, and transmitting the measured signal intensities to the serving access network node;
• in the serving access network node, selecting an optimal access network node using the received signal intensities and information of adjacent network resources, and transmitting information of the optimal access network node to the mobile terminal and the access gateway;
• in the access gateway, establishing a communication path between the mobile terminal and the selected optimal access network node using a predetermined routing table;
• and
• in the mobile terminal, receiving a traffic channel allocated by the optimal access network node, through the communication path, and wirelessly accessing the optimal access network node through the traffic channel.