Wireless Image Transmission Algorithm Baded On Balance Tree Routing

In the energy-constrained WSN data aggregation applications, a high-quality routingprotocol can reduce energy consumption. Data aggregation mainly adopted many-to-onedata transfer mode, in this mode, the network can be centrally collect data from monitoredobject at a full range. But this transfer mode can easily cause load imbalance in network.In such mode, some nodes carry too many data transfer tasks, deplete their energy rapidly,leading to lack of network coverage area or that the original data can not be delivered, andfinally make a energy hole. Load imbalance will increase the data transfer delay andshorten the network lifetime. Therefore, load imbalance mechanism must be considered inrouting protocol design. In this paper, for the purpose of network load balance, do thefollowing researches:First, for the load imbalance problem caused by CTP route in WSN, a kind of routeprotocol CTP-PLR was proposed. To achieve the goal of network load balance, the newalgorithm introduced the "overload node avoidance","choice of suboptimal parent node","neighbor entry update" mechanism. By establishing the mapping between data traffic andthe size of the tree structure, network load balance evaluation was designed. Simulationresults show that,compared with CTP, CTP-PLR algorithm improves the load balanceperformance of key words in network53percent, can achieve relative load blance betweennodes ofdifferent levels.Secondly, on the basis of CTP-PLR routing algorithm, an improved routing algorithmCTP-HNLB was proposed. CTP-HNLB routing algorithm was to improve overload nodejudgment in CTP-PLR routing algorithm, by introducing IDT, overload node judgment nolonger consider the node itself only, but to make a threshold by calculating the mean valueof IDT of the next hop node set. Simulation results show that, CTP-HNLB shows betterperformance than two other algorithms.Finally, in order to verify the practicability of CTP-PLR routing algorithm in the realenvironment, and to meet the need for wireless image transmission under limited powersupply circumstances, a wireless image transmission system based on TinyOS operating system was designed. The entire system consists of image acquisition nodes, wirelessrelay nodes, wireless data receiving station and monitoring stations. Arrange nodes in thereal environment and make a test, results show that data collection nodes can transfer datathrough a balanced multi-hop to the Sink under the control of the improved routingalgorithm.