A Hybrid Approach to Reduction of Packet Loss in Wireless Sensor Network

摘要

Wireless sensor networks are spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. and to cooperatively pass their data through the network to a main location The major role of sensor networks is sensing and delivering data to sink node, reliability is an important characteristic. However WSNs are associated with packet loss, which gets worse through multi-hop routing paths in wireless sensor networks, nodes near the destination have higher packet delivery performance. Numerous reasons for packet loss such as: signal attenuation due to the distance between the nodes, asymmetry in wireless communication links, non-uniform radio signal strength, wireless propagation effects (fading and multipath), interference due to hidden terminal problem, in addition to being greatly affected by the deployment environment, and the behavior of wireless communication have been noticed. In an attempt to reduce packet loss via WSN, this research study proposes a combined approach of distributed storage system algorithm for wireless sensor networks coupled with Replacing Lost Packets (Packet Loss Concealment) methods. . In an attempt to reduce packet loss via WSN, this research study proposes a combined approach of Modified distributed storage algorithm for wireless sensor networks (MDSA) coupled with Replacing Lost Packets (Packet Loss Concealment) methods. During this study, a DSS was designed with both repetition code and regeneration code in case there is a link failure. Results from this study showed that for both codes the success probability of both theory and implementation correlate, while the regeneration code showed the highest success probability. And therefore it was chosen for further study. The implementation of regeneration code results showed that the increasing of field size also correlate with the increasing of success probability for both theory and implementation. The implementation of the proposed PLC results showed that showed that the proposed PLC algorithm improves significantly the quality of speech transmitted over an unreliable network with high packet loss rate. Though, the proposed PLC introduces additional delay which needs to be considered but the increased delay is often a necessary expense if the signal quality is a priority.