Research And Design On Software Reliability Of Distributed Mobile Value-added Billing System

Mobile value-added service is based on communication technology, computer technology, Internet technology are being developed and merged constantly, with people's encouragement to various kinds of the application demand to increase fast based on information, the premise that the social information-based level improves day by day, a kind of brand-new method of service to develop rapidly. Build up by network, CDMA 1X with CHINAUNICOM, value-added service billing mode and past speech have difference to billing, so settled account in billing and put forward the new demand in supporting in value-added service. To great erupting simultaneously amount, high reliability and request of the expansibility for CDMA 1X value-added service billing system, traditional centralized difficult to satisfy with these request. And the distributed system undertakes the parallel processing; its enormous flexibility should deal with the exploding growth of value-added service. By these researches on pattern of trouble expression, analysis on the characteristic of the distributed system, problems in the design and software reliability, finally carry on improving its reliability by fault-tolerant technology. With the reliability designs of the distributed value-added service billing system, it carries on the reliability design in two respects of the hardware and software. In reliability design of the hardware, it adopts one pair of machines to design fault-tolerantly and redundantly, the communication mechanism of the network to carry on the state inquiry of the hardware. In software, it monitor each state checkpoint which deal with the thread, so resume or restart when break down in thread, and make thread can normal running. Based on the reliability design, the reliability of the distributed value-added service billing system is realized. Indicate through the analysis of performance, it is reasonable and practical to design ideas and methods showed in this thesis. And these are valuable for developing similar systems.