Software Defined Network (SDN) makes network management more flexible\nby separating control plane and data plane, centralized control and being\nprogrammable. Although, network measurement still remains in primary\nstage in SDN, it has become an essential research field in SDN management.\nIn this context, this paper presents a low-cost high-accuracy measurement\nframework to support various network measurement tasks, such as throughput,\ndelay and packet loss rate. In this framework, we only measure per-flow\nedge switches (the first and the last switches). In addition, a new adaptive\nsampling algorithm is proposed to significantly improve measurement accuracy\nand decrease network overhead. Meanwhile, we consider a low-cost topology\ndiscovery approach into our framework instead of topology discovery\ncurrently implemented by SDN controller frameworks. In order to improve\nthe accuracy of delay, we also join a time threshold value to adjust the time\ndelay. Furthermore, we consider and analyze the balance between measurement\noverhead and accuracy in several aspects. Last, we utilize POX controller\nto implement the proposed measurement framework. The effectiveness of our\nsolution is demonstrated through simulations in Mininet and Matlab.
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