Application-centric networking proposes a novel approach to provision connectivity services in transport networks based on application-specific requirements. By exploiting this paradigm, an application can request a service with several requirements to a generic control and management plane, which can leverage this information to differentiate a service on the overall network layers. However, an application-centric provisioning can lead to higher blocking probability when satisfying multiple requirements at the same time, thus impacting negatively both network operators and applications. This paper proposes a framework for the negotiation of connectivity services between a transport network and the applications running on top. In particular, an application can communicate its requirements to it and, in case of resource scarcity (either in term of bandwidth, latency, availability, etc.), the network can offer alternative solutions with a degraded service quality. The effectiveness of the proposed approach is proved by the lower blocking probability experienced by the service requests against a standard approach lacking negotiation capabilities, without in turn causing significant service degradation to the applications. In addition, the paper describes the software architecture behind the negotiation framework and its implementation on top of the ONOS SDN controller.

以应用程序为中心的联网提出了一种新颖的方法，可以根据特定于应用程序的要求在传输网络中提供连接服务。通过利用这种范例，应用程序可以向通用控制和管理平面请求具有若干要求的服务，该控制和管理平面可以利用此信息来区分整个网络层上的服务。但是，以应用程序为中心的置备在同时满足多个要求时会导致更高的阻塞概率，从而对网络运营商和应用程序造成负面影响。本文提出了一个谈判框架传输网络和运行在顶部的应用程序之间的连接服务的概念。尤其是，应用程序可以向其传达其要求，并且在资源稀缺的情况下（就带宽，延迟，可用性等而言），网络可以提供服务质量下降的替代解决方案。相对于缺乏协商能力的标准方法，服务请求遇到的阻塞概率较低，从而证明了该方法的有效性，而又不会导致应用程序的服务质量显着下降。此外，本文还介绍了协商框架背后的软件体系结构及其在ONOS SDN控制器之上的实现。