基于语义的NGN自适应业务提供关键技术研究
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摘要
下一代网络(NGN)是业务驱动型网络,能否快速高效地为用户提供所需要的各种业务决定着网络未来的发展。不同的用户终端类型和偏好,不同网络环境以及当时可用业务的不同都会影响到提供给用户的业务不同。如何实现业务提供者自适应用户环境、网络环境和业务环境来为用户提供个性化的服务,是通信业界十分关注的研究课题,对于NGN的发展和部署具有重要的指导意义和实用价值。
论文着重研究基于语义的自适应业务提供若干关键技术,包括自适应业务提供架构、自适应业务发现、自适应业务合成和自适应业务环境感知。
首先,论文在分析和比较已有NGN架构的基础上,提出了融合SOA和语义技术的自适应业务提供架构,并设计了典型自适应提供业务流程和实现方法。然后,分析了目前业务发现技术中存在的不足,提出了两种改进的基于语义的业务发现方法。一种是基于扩展业务简档的自适应业务匹配技术,可解决业务发现不能自适应用户终端能力的问题;另一种是语义匹配与词汇相似度匹配结合的混合业务匹配算法,可解决已有算法不能区分具有相同输入输出参数而功能不同的业务问题。接着,论文针对现有业务合成算法由于WSDL语言缺乏语义描述而不能实现网络域和电信域业务的自动合成问题,提出了采用OWL-S本体语言扩展CSTA业务简档的自动业务合成与验证方法,藉此实现NGN融合业务的自动合成与验证。最后,论文提出重用NGN主流控制协议SIP获得网络实时环境参数的机制,开发了基于语义的上下文感知SIP代理服务器,并设计了两种自适应业务验证它对网络和业务环境变化的自适应能力。
论文对提出的架构模型和算法进行了详尽的仿真。仿真结果表明,和已有模型和算法相比,本文提出的模型和算法性能良好,能很好地满足自适应用户环境、网络环境和业务环境向用户提供个性化业务的需要,对于NGN业务提供技术的实现和未来发展有较好的参考价值。
Next Generation Network (NGN) is a type of network driven by services. Its evolution is directed by its capability of providing users with varieties of services according to their requirements rapidly and efficiently. Diverse user terminals and preferences, distinctive network environment and different available services on the site altogether will have impacts on the service provisioning. How to adapt the network environment, user environment and service environment to provide the user with personalized services is an important research topic in communication industry. It is of vital guiding significance and practical value in NGN development and deployment.
The thesis focuses on the research on key technologies of semantics based adaptapive service provisioning, including adaptative service provisioning architecture, adaptative service discovery, adaptative service composition and adaptative service context awreness.
Following the performance analysis and comparison of existing NGN architectures, an adaptive service provisioning architecture integrating SOA with semantic technique is proposed together with its typical procedures and implementation approaches. Then, considering the shortcomings of existing service discovery techniques, two improved methods are proposed. One is an adaptive service matching technique based on extended service profile to tackle the problem of lacking of adaptability to the user terminal capability. The other is a hybrid semantic matching algorithm integrating semantic matching with lexical similarity matching. It tackles the problem that the existing algorithms are unable to distinguish those services with identical I/O parameters but with different functionalities. Furthermore, considering the fact that the existing service composition algorithms cannot support the automatic composition of telecom services and web services due to the absence of semantic description in WSDL, an automatic service composition and validation method is proposed. It extends CSTA service profile with OWL-S and can be used to realize the automatic composition and validation of NGN converged services. Finally, a mechanism is proposed to acquire network real-time environment parameters by reusing SIP, the NGN dominant control protocol. A semantics based context-aware SIP proxy server is developed and two adaptive services are designed to validate its capability adaptable to the change of network and service environment.
Detailed simulation is conducted to verify the proposed architectural models and algorithms. The simulation results have shown that their performance is superior to existing ones and can meet the requirements of provisioning personalized services adaptable to user, network and service environments. They are of good reference value to the realization and evolution of NGN service provisioning technologies.
论文着重研究基于语义的自适应业务提供若干关键技术,包括自适应业务提供架构、自适应业务发现、自适应业务合成和自适应业务环境感知。
首先,论文在分析和比较已有NGN架构的基础上,提出了融合SOA和语义技术的自适应业务提供架构,并设计了典型自适应提供业务流程和实现方法。然后,分析了目前业务发现技术中存在的不足,提出了两种改进的基于语义的业务发现方法。一种是基于扩展业务简档的自适应业务匹配技术,可解决业务发现不能自适应用户终端能力的问题;另一种是语义匹配与词汇相似度匹配结合的混合业务匹配算法,可解决已有算法不能区分具有相同输入输出参数而功能不同的业务问题。接着,论文针对现有业务合成算法由于WSDL语言缺乏语义描述而不能实现网络域和电信域业务的自动合成问题,提出了采用OWL-S本体语言扩展CSTA业务简档的自动业务合成与验证方法,藉此实现NGN融合业务的自动合成与验证。最后,论文提出重用NGN主流控制协议SIP获得网络实时环境参数的机制,开发了基于语义的上下文感知SIP代理服务器,并设计了两种自适应业务验证它对网络和业务环境变化的自适应能力。
论文对提出的架构模型和算法进行了详尽的仿真。仿真结果表明,和已有模型和算法相比,本文提出的模型和算法性能良好,能很好地满足自适应用户环境、网络环境和业务环境向用户提供个性化业务的需要,对于NGN业务提供技术的实现和未来发展有较好的参考价值。
Next Generation Network (NGN) is a type of network driven by services. Its evolution is directed by its capability of providing users with varieties of services according to their requirements rapidly and efficiently. Diverse user terminals and preferences, distinctive network environment and different available services on the site altogether will have impacts on the service provisioning. How to adapt the network environment, user environment and service environment to provide the user with personalized services is an important research topic in communication industry. It is of vital guiding significance and practical value in NGN development and deployment.
The thesis focuses on the research on key technologies of semantics based adaptapive service provisioning, including adaptative service provisioning architecture, adaptative service discovery, adaptative service composition and adaptative service context awreness.
Following the performance analysis and comparison of existing NGN architectures, an adaptive service provisioning architecture integrating SOA with semantic technique is proposed together with its typical procedures and implementation approaches. Then, considering the shortcomings of existing service discovery techniques, two improved methods are proposed. One is an adaptive service matching technique based on extended service profile to tackle the problem of lacking of adaptability to the user terminal capability. The other is a hybrid semantic matching algorithm integrating semantic matching with lexical similarity matching. It tackles the problem that the existing algorithms are unable to distinguish those services with identical I/O parameters but with different functionalities. Furthermore, considering the fact that the existing service composition algorithms cannot support the automatic composition of telecom services and web services due to the absence of semantic description in WSDL, an automatic service composition and validation method is proposed. It extends CSTA service profile with OWL-S and can be used to realize the automatic composition and validation of NGN converged services. Finally, a mechanism is proposed to acquire network real-time environment parameters by reusing SIP, the NGN dominant control protocol. A semantics based context-aware SIP proxy server is developed and two adaptive services are designed to validate its capability adaptable to the change of network and service environment.
Detailed simulation is conducted to verify the proposed architectural models and algorithms. The simulation results have shown that their performance is superior to existing ones and can meet the requirements of provisioning personalized services adaptable to user, network and service environments. They are of good reference value to the realization and evolution of NGN service provisioning technologies.
引文
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