传统网络只能依照预先定义的协议被动地传输数据.随着网络应用的不断扩大,新的用户需求和应用也不断涌现,而新的协议及服务却很难在现行网络上快速实施.主动网络为解决传统网络存在的问题提供了一条新思路.主动网络的主要优点是用户可...传统网络只能依照预先定义的协议被动地传输数据.随着网络应用的不断扩大,新的用户需求和应用也不断涌现,而新的协议及服务却很难在现行网络上快速实施.主动网络为解决传统网络存在的问题提供了一条新思路.主动网络的主要优点是用户可以根据需要向网络节点中插入程序,以完成定制的网络协议和服务.因此,主动刚络的核心功能是按照用户要求识别,传输,加载并运行主动应用程序,以完成用户所需要的计算.本文提出了一种基于XML的主动应用程序描述符AADX(Active Application Descriptor based on XML).该描述符可以用来标识主动程序并为其传输和加载提供基础.它为主动网络提供了一种有效灵活的主动程序识别和分发机制.展开更多
Resource reservation is an effective measure to ensure end-to-end quality of service （QoS）, however, the burstyness of the traffic makes the reservation idle some time, and forms a waste of re- sources. Based on the...Resource reservation is an effective measure to ensure end-to-end quality of service （QoS）, however, the burstyness of the traffic makes the reservation idle some time, and forms a waste of re- sources. Based on the analysis of active queue management （AQM） of DiffServ network, we propose a resource management scheme, which allows borrowing resources from unused reservation, accord- ing to the characteristics and advantages of cognitive networks. First, some nodes reserve certain proportion capacity for some special services （for instance, some services pay additional money） to guarantee the priority of these applications. Then resources are assigned according to the different parameters of services. If the available resource can not meet the requirements of new services, real- time ones are admitted with higher priority and allow borrowing the unused reservation from other nodes appropriately. Simulations show that, the proposed scheme has good performance at network resource utilization, the admission rate of new aDolications and OoS of users.展开更多
文摘传统网络只能依照预先定义的协议被动地传输数据.随着网络应用的不断扩大,新的用户需求和应用也不断涌现,而新的协议及服务却很难在现行网络上快速实施.主动网络为解决传统网络存在的问题提供了一条新思路.主动网络的主要优点是用户可以根据需要向网络节点中插入程序,以完成定制的网络协议和服务.因此,主动刚络的核心功能是按照用户要求识别,传输,加载并运行主动应用程序,以完成用户所需要的计算.本文提出了一种基于XML的主动应用程序描述符AADX(Active Application Descriptor based on XML).该描述符可以用来标识主动程序并为其传输和加载提供基础.它为主动网络提供了一种有效灵活的主动程序识别和分发机制.
基金Supported by the High Technology Research and Development Program of China(No.2009AA01Z211)the Fundamental Research Funds for Central Universities of China(No.2009YJS034)+1 种基金Beijing Nature Science Foundation of China(No.4112044)the Research Fund for the Doctoral Program of Higer Education of China(No.20120009110009)
文摘Resource reservation is an effective measure to ensure end-to-end quality of service （QoS）, however, the burstyness of the traffic makes the reservation idle some time, and forms a waste of re- sources. Based on the analysis of active queue management （AQM） of DiffServ network, we propose a resource management scheme, which allows borrowing resources from unused reservation, accord- ing to the characteristics and advantages of cognitive networks. First, some nodes reserve certain proportion capacity for some special services （for instance, some services pay additional money） to guarantee the priority of these applications. Then resources are assigned according to the different parameters of services. If the available resource can not meet the requirements of new services, real- time ones are admitted with higher priority and allow borrowing the unused reservation from other nodes appropriately. Simulations show that, the proposed scheme has good performance at network resource utilization, the admission rate of new aDolications and OoS of users.
