ZigBee-based Dense Sensor Network Collision Avoidance Research

Aluminum production is mainly comp leted in the electrolytic tank, the temperature of tank bottom, column, anode, cathode and other current and groove shell, the upper structure and other parameters is an important parameter in the aluminum electrolysis production process, the level of the detectio n of these parameters plays an important guiding role in the production of aluminum. Due to the aluminum cell actual production environment needs too many nodes, it is easy to cause the data collision and packet loss, which causing a conflict of data communication. If the node conflict, it will choose backoff retransmission, not only will cause communication energy waste, data transmission delay and also affect the efficiency of date communication. The frequent occurrence of the conflict will have a very ne gative impact on the performance of the network.(1) This thesis introduce the ZigBee technology in the collision problems and relevant solutions, analysis the function of each layer ZigBee stack, expounds the characteristics of ZigBee technology and the advantages of application in the monitoring system of aluminum electrolysis cel.(2) This thesis analyzes the three topologies of ZigBee network, and according to the characteristics of the terminal node and coordinator in the one hop range designs the star network topology which is suitable for the monitoring of aluminum electrolysis cel. And designed nodes joining the network scheme.(3) The terminal node of the aluminum electrolysis cell is used to locate the node number, which can reflect the location of the node in the aluminum reduction cel.(4) A dense sensor network collision avoidance research based on ZigBee proposed in this thesis adopt a fixed time slot access mechanism,which can achieved a total of hundreds of nodes in the node temperature and the electric current data transmission. This thesis proposes a GTS time slot application mechanism based on data class priority, and combines with the TPSN clock synchronization mechanism to achieve the node's periodic acquisition and transmission.(5) Finally, the OMNe T++ object-oriented discrete event network simulator to realize this simulation. Analyze and design all kinds of frame structure will be used in this simulation.