An Implementation of Active Push Technology for WLAN

• Main Authors: Zih-Tong Wu, 吳治同
• Other Authors: Wen-Tzu Chen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/37650210947550033745

碩士 === 國立成功大學 === 電信管理研究所 === 93 === As the increase of the demand of mobile access and the reduction of the cost of wireless access devices, the applications of wireless local network will gain significant benefits in the future. When the number of WLAN users increases, the network traffic load of the WLAN will become heavy. By applying active push technology on the WLAN, the traffic load can be dramatically reduced. Instead of spending considerable time in searching for the wanted information, the WLAN users can simply receive their information through active push technology. Hence, the traffic load between the servers and the mobile devices could be improved dramatically. In WLAN systems, mobile users usually access the Internet through Access Point (AP). In general, the AP can be deployed with or without NAT (Network Address Translation) function. In order to implement an active push technology under different WLAN conditions, we need to overcome some difficulties, such as initializing a pushing connection outside the NAT, and optimizing the push efficiency in accordance with different WLAN conditions. Therefore, it is necessary to design an auto-detecting mechanism to make sure whether the NAT function is built in an AP or not. In this thesis, we take advantage of two available technologies, PushRegistry (a Java package allowing you to register push alarms and connections) and STUN (Simple Traversal of UDP through NAT) protocol, to design our push system, named active push system. Also, we will take some critical issues into consideration to improve the performance of our Active Push System, like the power consuming, flexibility of the service server and the real-time messaging. This implementation of push technology is useful for designing and developing a prototype of the active push system based on a real WLAN.