Patent ID: 7242674

Claim:
A system of controlling a multimedia call in a mobile communication system, comprising: first and second mobile stations to initiate and respond to a multimedia call, respectively and process a visual communication in accordance with a multimedia call service option; a base station/base station controller configured to set up the multimedia call using a multimedia bypass service option after recognizing the multimedia call service option of at least one of the first and second mobile stations; a mobile switching center configured to set up the multimedia call using the base station/base station controller to control the second mobile station according to the multimedia call service option from the base station/base station controller; radio link connecting means used to connect the first and second mobile stations while bypassing a radio link protocol after each of the first and second mobile stations establishes a traffic channel with the base station according to the multimedia call service option; and means for transmitting/receiving multimedia data using a higher application protocol than the radio link protocol to maintain a multimedia call in each of the first and second mobile stations connected by the radio link connecting means, wherein data is communicated between the first and second stations according to the multimedia call service option without passing through an Inter-Working Function (IWF) or a Packet Data Serving Node (PDSN), and wherein each of first and second mobile stations further comprises a packet data synchronization protocol for transmitting a frame for packet data synchronization with a counterpart mobile station.