Neighbor Table Based Performance Improvement in ZigBee Mesh Networks with Multiple Gateways

• Main Authors: Da-Wei Yang, 楊大威
• Other Authors: 吳坤熹
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/55875257190993196720

碩士 === 國立暨南國際大學 === 資訊工程學系 === 103 === Wireless Sensor Networks consist of lots of sensors and communicate with lower data rates, short range wireless technologies. In ZigBee wireless communication systems, when a system is collecting data, all data will pass through the coordinator which serves as a gateway to the database. Due to the nature of wireless communication, all nodes sending data to the coordinator will compete with each other to gain access to the wireless channel. When lots of data are waiting in a queue, the limited buffer size may easily cause packet loss, and the overall performance will decrease. Some previous work was proposed to use multiple gateways to disperse traffic flows. Although it can solve the bottleneck problem, sometimes the actual performance is still bad due to the imbalanced gateways which receive data. In my thesis, a modified routing method was proposed to solve the imbalanced problem, and reached balanced state to improve transmission efficiency. A ZigBee network management system was also developed, which has a graphical interface for users to observe current ZigBee topology easily. Managers could also easily modify the routing and topologies of wireless sensor networks with this system.