Design And Implementation Of Digital Media Services Platform For Operations Support Services

With the number of network users increasing, the highly efficient content distribution of the popular data has attracted more and more attention. Digital media network is the one which adopts the unidirectional broadcast as the main data transmission form. So how to realize an operational service system over such a network is an important research subject in application field.In this thesis the research on access control mechanisms is summarized. Basing on the present technology situation of automatic update service in C/S software, the access control of operational support service in unidirectional broadcast network and software automatic update service are thoroughly discussed. The peer to peer solution for access control and software update in unidirectional network is therefore proposed here.According to the RABC model and the characteristics of unidirectional broadcast network, fine granularity authorization model frame based on tree service is also proposed here. Their design and realization of all modules are explained subsequently in detail, which features the frame level. The software automatic update model is applied under unidirectional network, which refers to the specific realization method in C/S pattern. This service system can be applied independently in all kinds of business application. Software category index and management of version can be built to the frame requirements of update model and protocol service;the update system can therefore control the automatic installation, execution.The innovation of this thesis lies in the following aspects.1. The traditional authorization and access control models in computer network are both based on mutual network. Though the conditional receivable in cable TV network is constructed on unidirectional network, the authorization for the programmer is granular. So their advantages are combined here, and fine granularity authorization model based on tree service is proposed and realized, which is applicable in broadcast network.2. All the present solutions of software update service are applied in mutual network C/S model. While the model proposed in this thesis, which features the broadcast network, is different with the traditional ones. What's more, the design idea of update service here can turn the update process into a sequence execution of several original actions, which greatly enhances the flexibility. So the present application service can be not only updated, but also the system can install the new application for the users.The authorization and update service in operational system presented in this thesis have been accomplished, and integrated in the digital media service platform. In reality the whole system has been applied on many remote education services, including modern remote education project for party members and cadres in the country, and it is also commercialized in other fields. The practical applications have verified the validation of operational support service, and obtained favorable social and economic results.