Abstract: Timeliness is one of the most important considerations in wireless multimedia sensor networks(WMSN)，and whether the MAC protocol can efficiently use the radio channel plays a decisive role in guaranteeing timeliness of WMSN. According to the data features of the wireless multimedia sensor networks, we proposed a multi channel real-time MAC protocol based on time slots reservation. hhe protocol establishes a time slots reservation based flow path from the source node to the convergent node before responding to the streaming media inquiries, thereby it can minimize each channel access delay while transmitting the data package. hhe simulation results show that the protocol can significantly reduce the end to end delay and the delay dithering of the streaming media data, and it also has better energy efficiency.

Key words: WMSN, MAC, Real-time, Multi-channel