Patent ID: 7957281

Claim:
A method for interworking between an access control router and a position determination entity in a position recognition system based on a portable Internet, the method comprising the steps of: transmitting, by the position determination entity to the access control router, a socket connection request; determining, by the position determination entity, if a socket connection response is received in response to the socket connection request within a predetermined period of time after transmitting the socket connection request; transmitting, by the position determination entity, an alive request regarding a currently connected port, when it is determined that the socket connection response has been received; transmitting, to the access control router, a position determination request including a message for requesting a position determination, after receiving a response to the alive request; performing, by the position determination entity, position determination by using a measurement value included in a response to the position determination request; retransmitting the alive request a predetermined number of times, when the response to the alive request fails to be received within a predetermined period of time after transmitting the alive request; and releasing the socket connection, when the response to the alive request fails to be received, after retransmission is performed the predetermined number of times.