A mobile multimedia broadcast transmission system is provided, which comprises: a Reed-Solomon coding and byte interleaving unit, a Low Density Parity Check coder, a bit interleaver, a constellation mapping unit, a frequency domain symbol generator, a scrambler, an Inverse Fast Fourier Transform unit, a time domain framing unit, and a transmitter. A control state machine defines various commands and generates corresponding control signals. The group member application server nodes can send and receive messages through associated group leader application server nodes. Individual information of the image sensor is stored in the data region, as digital information. A status associated with a threshold is attained when the rate is exceeded the requisite threshold number of times. The optical disk drive module includes a chassis module, a drive carrier, a cover, a button, and an engaging switch.