Redundant Transmission of Sensed data in Wireless Sensors and Actor Networks for Improved Reliability
Selvaradjou1, K. Bharathi Manjula2

1Ka. Selvaradjou, Department of Computer Science & Engineering, Pondicherry Engineering College, Puducherry, India.
2K. Bharathi Manjula, Department of Information Technology, Dhanalakshmi Srinivasan College of Engineering, Mamallapuram, Chennai, India.

Manuscript received on May 11, 2013. | Revised Manuscript received on May 15, 2013. | Manuscript published on May 25, 2013. | PP: 38-41 | Volume-1 Issue-7, May 2013. | Retrieval Number: G0305051713/2013©BEIESP

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Abstract: In Wireless Sensor and Actor Network (WSAN), sensors and actors are linked through wireless channel. Sensor nodes are those which sense data and forward them to actors, which in turn process the data and perform a suitable action on the environment. An actor is a node that also acts as a data sink in the WSANs. The actor node, which can be a mobile, or a static node, may take actions on the environment either individually or collaboratively with other such nodes that may be present in the network. It is important that the sensed events are reported to the sink nodes with high reliability and in a timely manner in order to effect a real-time response behavior of the network. We consider a network in which sensors deliver the sensed events in the form of messages and data in a multi-hop manner. While forwarding data there is a possibility of data loss due to various reasons such as collision, noise interference, and congestion in the network. In such cases, the messages need to be re-transmitted to ensure reliability. Such re-transmissions would waste bandwidth and scarce energy of the sensor nodes and will lead to a shorter lifetime of the network. We propose redundant data transmission schemes in which, the messages are retransmitted by embedding the neighbor node’s message as backup data along with the original message. So data even when lost, reaches the destination via neighbour nodes’ messages. We evaluated the performance of the protocol using TOSSIM simulator and the embedding of data packets helps improving the lifetime of the network.
Keywords: Medium Access, Reliability, Sensor Networks, Wireless.