Modified TCP to Handle Corruption loss over bursty links in Wireless Sensor Networks

TCP performance over the wireless links between sensor node and gateway in wireless sensor networks is studied, by deploying a wireless rate-control technique, whose link characteristics are identified by variable link rate and bursty transmission error. A modified TCP is presented which caches TCP packets selectively based on the wireless channel condition and the cached packets are retransmitted locally over the wireless link in case corruption loss is detected. In addition, for effective adaptation to variable bandwidth, the window feedback is calculated based on the bandwidth-delay product estimation and the queue level, and then this feedback information is conveyed on the receiver´s advertised window field in the acknowledgements returning to TCP sources (sensor source node). The proposed scheme will be useful when the WSN is used for multimedia data transmission, which involves high rate data. Simulation results proves the performance improvement.