Patent ID: 7447237

Claim:
A radio access network system having a synchronous server and at least one node, wherein the synchronous server comprises: a clock generator configured to periodically generate a clock; and a synchronous message transmitter configured to generate a synchronous message for notifying information regarding the generated clock, and to transmit the generated synchronous message to the node using an IP packet; and the node comprises: a time calculator configured to obtain a time of receiving the synchronous message; and a clock correction processor configured to calculate a clock correction value in accordance with the time of receiving the synchronous message and the information regarding the clock notified by the synchronous message, and to correct a generated timing of a clock in the node in accordance with the clock correction value, wherein the time calculator is configured to measure a reception interval of the synchronous message, and the clock correction processor is configured to calculate, without using the synchronous message, the clock correction value when the reception interval of the synchronous message is more than a predetermined threshold.