Gprs Data Communications. Pda Power-site Calibration System Reliability Study

In Power sector, Field-Checkout is a process which checks and data mining from the meters in order to ensure the grid working stably, it's one of most important tasks in the power sector, but the old ways can't be satisfied the requirements. With computers and wireless communication technology and the rapid development of the popularity of the Internet, the use of advanced communication technology for the power sector to provide a better measurement of service, it's critical for efficiency and reliability in power sector. This paper refers to the PDA field-checkout service, using the extensive coverage of GPRS network and the powerful and scalability of WCE operation system, designing and implementing a wireless distance communication system to manage data between PDA and servers based on GPRS network. But PDAs will disconnect if there are lost and error package in case of large scale data, and the servers can't provide service if there are many connections at the same time, this paper designs and implements a data compression algorithm to reduce the PDA terminals and servers interactive data flow, thereby reducing packet loss and packet wrong probability. Design and implement an error recovery mechanism, which recover the task when the connection lost. At the server side, design and implement a distribute system which uses loading balance strategy, it can enhance the response speed, lower probability when a number of terminals and connecting with the server at the same time and they fail to provide timely service ; the other hand, increased server resource utilization, and give full play to the role of the server system. This paper describes the overall system design and realization, the performance of the system shows good performance and it can better meet the requirements of wireless communications services.