TCP goes one step further than IP and provides two important features: connections and quality of service.
TCP的功能比IP更进一步，并提供两个重要特性：连接和服务质量。
IMS specifies enablement of quality of Service within the IP network and takes advantage of th QoS mechanism to improve and guarantee the transmission quality.
IMS指定了IP网络内的服务质量增强功能，并利用QoS机制来提高和保证传输质量。
From the shortcomings existing in the classical network, the future network should base on the all IP network and provide quality of service and mobile support.
鉴于当前网络存在的不足，未来其发展趋势应该是一个全ip的具有服务质量保证、支持移动应用的网络。
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