Patent ID: 8055221

Claim:
A method of providing a video call service in a mobile station in a weak signal environment, the method comprising the steps of: determining, by a receiving mobile station (MS), whether the receiving mobile station is in a weak signal environment based on the quality of audio and video (A/V) data included in a multiplexer protocol data unit (MUX-PDU) and transmitted from a transmitting mobile station during a video call; if it is determined that the MS is in a weak signal environment, requesting, by the receiving mobile station, that only the audio data is transmitted; generating, by the transmitting mobile station, the MUX-PDU by allocating only the audio data to a video data field of the MUX-PDU in response to the request, and repeatedly transmitting the MUX-PDU for a preset time before generating and repeatedly transmitting a next MUX-PDU from the sequence; and when the MUX-PDU is received, processing the audio data by the receiving mobile station so that the audio data is continuously reproduced.