Patent ID: 8837368

Claim:
A transmission method of a femtocell, comprising: receiving and temporarily storing a plurality of real-time transport protocol (RTP) packets from the Internet in a buffer by the femtocell; sampling the buffer at a sampling rate to generate a plurality of circuit switched (CS) data packets, and recording a plurality of timestamps of the CS data packets by the femtocell when the RTP packets are temporarily stored for a time period, wherein the CS data packets include a current CS data packet; calculating a connection frame number (CFN) of the current CS data packet according to a current CFN by the femtocell when there exists no previous CS data packet transmitted to a user equipment (UE); calculating the CFN of the current CS data packet according to the CFN and the timestamp of the previous CS data packet, and the timestamp of the current CS data packet by the femtocell when there exists the previous CS data packet; and transmitting the current CS data packet and the CFN of the current CS data packet to the UE by the femtocell.