Research On Isolated Issue And Energy-saving Routing Algorithm For ZigBee Network

As the rapid process of city infrastructure construction and urbanization, how to protect the safe operation of urban drainage pipeline network is an urgent problem. Consequently, it is essential to construct a dynamic monitoring system for the safe operation of urban drainage pipeline network. In mountainous environments, it is extremely hard to wiring and maintaining the network. While in huge and medium city, the scale of monitoring area is so large and it is infeasible to collect field data from sensors by deploying GSM/GRPS cellular communication module on each one due to the large due to the cost and high energy consumption.ZigBee wireless sensor network technology has already been applied in many fields like agriculture and industry. It is characterized by low investment, flexible topology, easy reconstruction and no wiring. Some disadvantages still exist although it is already a new short-range wireless communication technology. For example, the ZigBee distributed address allocation mechanism may impact fully utilization of the network address resources. Some nodes may be turned to be isolated when the node parameters are configured poorly, which may disconnects some expecting connection and leads to hardware wastes or serious consequences when the network connection ratio decreased and vacancy of some deployed devices.In order to satisfy the application demands of the drainage pipeline network in cities, extend network covering range, and avoid rendering the network monitor devices isolated. This thesis did some research on connection mechanisms of ZigBee technology. The reason why the ZigBee distributed address allocation mechanism may cause isolated nodes is analyzed. A new algorithm is proposed to reduce the number of isolated nodes. A program is composed to test it. Meanwhile, in order to increase the use of equipment and longer network life cycle, a MBC-AODV-Cluster energy saving algorithm is designed by taking the idea of clustering. The algorithm was tested by developed codes and the testing results were analyzed.The isolated nodes reducing algorithm was tested and results show that the algorithm utilizes ZigBee network resources efficiently by reducing the number of isolated nodes in ZigBee network, the deployed devices connection ratio could also be increased about 7-13%. The MBC-AODV-Cluster and AODV algorithms were tested under identical testing environment. The results were analyzed and compared. It can be concluded that algorithm of MBC-AODV-Cluster is much better than AODV, because it saved 5% of energy, the ratio of successful message transmission decreased as the number of nodes reduced, and message transmission delay and number of routing message reduced both.