Patent ID: 7817595

Claim:
A synchronization method for a communication system, the communication system comprising a user device and a wireless network, the synchronization method comprising: transmitting a RRC re-configuration message containing ciphering configuration information to the user device on a logical link using the wireless network; suspending transmission of messages on the logical link using the user device after receiving the RRC re-configuration message; changing to a new ciphering configuration according to the RRC re-configuration message using the user device; changing to the new ciphering configuration using the wireless network; transmitting a RRC response message to respond the RRC re-configuration message to the wireless network on the logical link using the user device; and resuming the transmission of messages on the logical link after changing to the new ciphering configuration using the user device; wherein the transmission of messages on the logical link is resumed before the RRC response message is transmitted to the wireless network.