论文标题
关于NS-3中真实无线通道占用的复制
On the Reproduction of Real Wireless Channel Occupancy in ns-3
论文作者
论文摘要
在无线网络研发中，我们通常依靠模拟和实验来评估和验证新的网络解决方案。虽然模拟允许对场景条件进行完全控制，但现实世界实验受外部随机现象的影响，可能会产生几乎不可重复和可重现的结果，从而影响评估中解决方案的验证。以前，我们提出了基于痕量的仿真方法（TS）方法来解决该问题。 TS使用无线电链路质量和节点位置的痕迹来准确再现NS-3中的过去实验。但是，在当前版本中，TS方法与无线电频谱与并发网络共享的方案不兼容，因为它不会重现其频道占用。在本文中，我们介绍了InterferencePropagationLossModel和修改后的Maclow，以允许复制过去实验中经历的通道占用率。为了验证所提出的模型，在W-ilab.T测试床中执行的不同实验中测量了网络吞吐量，以控制并发网络引入的通道占用。然后将实验结果与使用改进的TS方法，旧式TS方法和纯模拟实现的网络吞吐量进行了比较，从而验证了新提出的模型，并确认了它们与以前在真实环境中执行的实验相关性。
In wireless networking R&D we typically depend on simulation and experimentation to evaluate and validate new networking solutions. While simulations allow full control over the scenario conditions, real-world experiments are influenced by external random phenomena and may produce hardly repeatable and reproducible results, impacting the validation of the solution under evaluation. Previously, we have proposed the Trace-based Simulation (TS) approach to address the problem. TS uses traces of radio link quality and position of nodes to accurately reproduce past experiments in ns-3. Yet, in its current version, the TS approach is not compatible with scenarios where the radio spectrum is shared with concurrent networks, as it does not reproduce their channel occupancy. In this paper, we introduce the InterferencePropagationLossModel and a modified MacLow to allow reproducing the channel occupancy experienced in past experiments. To validate the proposed models, the network throughput was measured in different experiments performed in the w-iLab.t testbed, controlling the channel occupancy introduced by concurrent networks. The experimental results were then compared with the network throughput achieved using the improved TS approach, the legacy TS approach, and pure simulation, validating the new proposed models and confirming their relevance to reproduce experiments previously executed in real environments.
