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User-AP Association Management in Software-Defined WLANs
IEEE Transactions on Network and Service Management ( IF 4.7 ) Pub Date : 2020-09-01 , DOI: 10.1109/tnsm.2020.3001869
Suzan Bayhan , Estefania Coronado , Roberto Riggio , Anatolij Zubow

Despite the planned operation of enterprise wireless local area networks (WLANs), they still experience unsatisfactory performance due to several inefficiencies. One of the major issues is the so-called sticky user problem, in which users remain connected to an access point (AP) until the signal quality becomes too weak. In this paper, we leverage software-defined networking (SDN) to propose a user association solution for WLANs aiming to mitigate such inefficiencies, thus improving resource utilization. As it is a computationally hard problem, we also design various low-complexity user-AP association schemes that consider not only signal quality but also AP loads and minimum quality requirements for user traffic. Moreover, to provide simultaneous content distribution in a sustainable mode, we propose exploiting link-layer multicasting to decide on user-AP associations. Our analysis via simulations and experimentation on an open-source testbed shows that considering user-AP association jointly with multicast delivery leads to a significant performance increase over the default client-driven approach: the median throughput is $11\times$ higher when all users request the same content and the achieved improvement decreases to 68% for 100 contents. Moreover, due to more efficient use of the airtime, unicast users achieve higher throughput if multicast delivery is exploited.

中文翻译:

软件定义 WLAN 中的用户-AP 关联管理

尽管企业无线局域网 (WLAN) 已按计划运行,但由于一些效率低下,它们的性能仍然不尽如人意。主要问题之一是所谓的粘性用户问题,即用户保持与接入点 (AP) 的连接,直到信号质量变得太弱。在本文中,我们利用软件定义网络 (SDN) 为 WLAN 提出了一种用户关联解决方案,旨在减轻这种低效率,从而提高资源利用率。由于这是一个计算困难的问题,我们还设计了各种低复杂度的用户-AP 关联方案,不仅考虑了信号质量,还考虑了 AP 负载和用户流量的最低质量要求。此外,为了以可持续的模式提供同步内容分发,我们建议利用链路层多播来决定用户-AP 关联。我们通过在开源测试平台上的模拟和实验进行的分析表明,与默认的客户端驱动方法相比,考虑用户-AP 关联和多播交付会显着提高性能:当所有用户请求时,吞吐量中值高出 11 美元相同的含量,100 个含量,实现的改进降低到 68%。此外,由于更有效地使用通话时间,如果利用多播传送,单播用户可以获得更高的吞吐量。当所有用户请求相同的内容时,吞吐量中值高出 11 美元,而对于 100 个内容,实现的改进降低到 68%。此外,由于更有效地使用通话时间,如果利用多播传送,单播用户可以获得更高的吞吐量。当所有用户请求相同的内容时,吞吐量中值高出 11 美元,而对于 100 个内容,实现的改进降低到 68%。此外,由于更有效地使用通话时间,如果利用多播传送,单播用户可以获得更高的吞吐量。
更新日期:2020-09-01
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