Internet综合业务模型在IP-ATM互联网络的服务映射

IIS SERVICES MAPPING IN IP ATM INTERNETWORKINGWT〗

在ＩＰ－ＡＴＭ互联网络环境，ＡＴＭ子网在ＩＰ主机通信经过的路径上，ＡＴＭ网络边缘（入口和出口）设备将ＩＰ与ＡＴＭ网络物理上互联起来．在这种互联网络环境支持ＩＳ服务的时候，资源预约机制在ＩＰ网络实现资源预约，在ＡＴＭ子网，由边缘设备执行ＩＷＦ（ｉｎｔｅｒｗｏｒｋｉｎｇｆｕｎｃｔｉｏｎ）功能，为ＡＴＭ子网进行资源预约代理．边缘设备执行的ＩＷＦ功能中，一项重要的工作是进行ＩＰＩＳ服务模型到ＡＴＭＱｏＳ模型的服务映射，通过服务映射，在ＡＴＭ子网入口边缘设备和出口边缘设备之间建立起满足ＩＳ服务要求的ＶＣ连接，并对连接进行管理．文中给出互联环境中，ＩＳ服务模型到ＡＴＭＱｏＳ模型的服务类型和服务参数映射解决方案，在进行服务参数映射的时候基于流模型提出利用边缘设备的缓存调节数据流参数映射，并导出相应的公式．

In IP ATM internetworking, edge devices are used to connect IP and ATM subnets physically. To support IIS services, edge devices, functioning as a proxy, setup VC connections inside the ATM subnet to support the IIS services QoS requirements including services mapping between the IIS service model and the ATM QoS model. A service mapping solution is given in the paper. And based on the ideal stream model, formulas are deduced which use the buffer of edge devices to influence the stream description parameters mapping.