Patent ID: 8605888

Claim:
A method for controlling call connection in a base station, the method comprising: receiving a message; calling a state function, at a control subsystem, corresponding to the received message and a current call state among a plurality of state functions that are mapped to a plurality of elements of a state function matrix, wherein the state function matrix includes a plurality of call states as one index among row and column indexes, and a plurality of messages as the other index; and operating the called state function at the control subsystem, wherein the state function matrix includes a plurality of first state functions that are operated when receiving a message that is appropriate for a current call state and a plurality of second state functions that are operated when receiving no message that is appropriate for the current call state, wherein the plurality of messages of the state function matrix includes a plurality of call connection messages and a message indicating non-receipt of a call connection message within a period of time, and wherein the second state functions includes at least one of a function that is operated when a message that is not expected in the current call state and a function that is operated when an expected message is not received before a predetermined time expires.