SAR: A Self-Adaptive and Reliable protocol for wireless multimedia sensor networks

Recent years have witnessed a substantial growth in wireless multimedia sensor networks (WMSNs) due to the development of low-cost camera together with low-power system-on-chip (SoC). Unlike previous wireless sensor networks (WSNs), WMSNs strictly requires sustained multimedia data to be delivered over long periods of time, in contrast to the environmental noises. In this paper, Self-Adaptive and Reliable Point-to-Point (SAR) protocol for WMSN is presented. This transport protocol not only guarantees to dispatch all messages successfully but also adapts the data rate of the higher layer to prevent the network from congestion. The design is validated in a pair of Raspberry Pi and Atmel AT86RF212 module under different conditions. The experimental results indicate that SAR can carry out a wide range of transmission rates, from 16.6 to 470.5 Kbps, with distance up to 50 m. Moreover, the number of lost messages is eliminated around 47%, upon the utilization of proposed self-adaptive framework, Decrease Quickly Increase Slowly (DQIS).