The Effectiveness And Privacy Design For Wireless Body Area Networks And Its Application

The development of wireless communication technology has promoted people's expect for short-range wireless technology,mobile communication is now designed with more personalization and miniaturization.Wireless body area network is short-range and human centered,it has a broad application prospect in daily life,health,entertainment,military and other fields.The effectiveness,security and privacy of data transmission in body area network has drawn extensive attention from researchers.Effectiveness refers to the low energy consumption of data in transmission process.Security and privacy represents that in wireless transmission process,the data will not be stolen thus causing information lost or leaking.In a result,how to realize the effectiveness while ensuring the data security has become the main challenge faced in body area network study.This paper analyzes three-tier architecture of body area network respectively,then works out one control method and strategy which can improve the effectiveness,secu-rity and privacy according to principal problems faced in each layer.The proposed technical solution is effective and easy to be implemented.Besides,experiment plat-form is built to verify our strategy.Compressed Sensing-based adaptive sampling and compression method is pro-posed for the first layer of body area network,which refers to data transmission from sensor nodes to coordinator.This method can ensure the reconstruction error under the condition of unstable wireless channel or sparse change of node data in order to realize effective clinical treatment.At the same time,we propose a new reconstruction algo-rithm by optimizing the subspace tracking algorithm,which can further improve the quality of system reconstruction quality and get higher compression ratio.Simulation results prove that our proposed method can maintain the stability of the reconstruction quality in condition that the sparse degree of wireless channel changes or the wireless channel is unstable.In the process of data collection from multi-sensors to coordinator,a new MAC layer protocol is designed considering the character of low energy consumption and influence of node heterogeneity in wireless body area network.The protocol is within network architecture of master-slave star and adopted time division multiplexing access(TDMA)control strategy,then one dynamic slot allocation mechanism is proposed.Our proposed method can fully use allocated time slots,reduce the number of infor-mation interaction and meet the requirements of low energy consumption under the condition of time delay and cache limit.In addition,time slots reservation mechanism is proposed according to the influence of packet loss rate in the scene.In both nor-mal and alarming cases,this mechanism can maintain low energy consumption while meeting the requirements of high reliability and real-time performance.Finally,one experimental platform is designed based on the proposed mechanism,and the MAC layer protocol is tested and evaluated through the platform,which reflects low energy consumption of our proposed MAC protocol.In the cloud platform layer of body area network,one emergency response schedul-ing system model is first put forward based on cloud computing technology.Then we design an emergency response scheduling mechanism under this model,including e-mergency detection,distance privacy calculation,attribute matching calculation and safety scheduling algorithm.By the use of MDRQs method and bilinear pairing tech-nology,the first part effectively guarantees the accuracy and privacy of emergency detection.Then the distance privacy and attribute matching calculation algorithm are designed based on the homomorphic encryption technology,which protects both lo-cation and attribute information privacy of users and medical service providers,this technology can also protect against collusion attacks by the way.Finally,in combining calculated elements of both distance and attributes matching degree,we design a new scheduling algorithm to guarantee the timeliness and effectiveness of the scheduling.The simulation results show that the design of scheduling mechanism in this chapter has short running time and communication overhead,which can verify the feasibility and effectiveness of our proposed method.