Improving Resource Efficiency with Partial Resource Muting for Future Wireless Networks

We propose novel resource allocation algorithms that have the objective of finding a good tradeoff between resource reuse and interference avoidance in wireless networks. To this end, we first study properties of functions that relate the resource budget available to network elements to the optimal utility and to the optimal resource efficiency obtained by solving max-min utility optimization problems. From the asymptotic behavior of these functions, we obtain a transition point that indicates whether a network is operating in an efficient noise-limited regime or in an inefficient interference-limited regime for a given resource budget. For networks operating in the inefficient regime, we propose a novel partial resource muting scheme to improve the efficiency of the resource utilization. The framework is very general. It can be applied not only to the downlink of 4G networks, but also to 5G networks equipped with flexible duplex mechanisms. Numerical results show significant performance gains of the proposed scheme compared to the solution to the max-min utility optimization problem with full frequency reuse.Comment: 8 pages, 9 figures, to appear in WiMob 201

FDDS-MAC : Enhancing spectrum usage on full-duplex communications in 5G mobile wireless networks

Trabalho financiado pelo Edital DPI / DPG - UnB n° 02/2018 (Apoio à Publicação de Artigos em Anais de Eventos, resultantes de Pesquisa Científica, Tecnológica e de Inovação de servidores do Quadro da Universidade de Brasília).Full-duplex communications emerged as an alternative to improve throughput and spectrum usage on the forthcoming fifth-generation (5G) mobile networks. However, the existing medium access control schemes for full-duplex lack mechanisms designed to enhance spectrum usage. In this context, this work proposes FDDS-MAC, which is a full-duplex communication scheme tailored to improve spectrum usage. FDDS-MAC introduces a decision phase where the receiver with a higher probability of having data back to the sender is prioritized in the sender’s packet queue. Thus, FDDS-MAC is able to perform packet rescheduling to boost throughput and spectrum usage. Numerical results show that FDDS-MAC has a positive impact over full-duplex communications, achieving throughput up to 40% higher than a state-of-art full-duplex scheme

Low-latency Networking: Where Latency Lurks and How to Tame It

While the current generation of mobile and fixed communication networks has been standardized for mobile broadband services, the next generation is driven by the vision of the Internet of Things and mission critical communication services requiring latency in the order of milliseconds or sub-milliseconds. However, these new stringent requirements have a large technical impact on the design of all layers of the communication protocol stack. The cross layer interactions are complex due to the multiple design principles and technologies that contribute to the layers' design and fundamental performance limitations. We will be able to develop low-latency networks only if we address the problem of these complex interactions from the new point of view of sub-milliseconds latency. In this article, we propose a holistic analysis and classification of the main design principles and enabling technologies that will make it possible to deploy low-latency wireless communication networks. We argue that these design principles and enabling technologies must be carefully orchestrated to meet the stringent requirements and to manage the inherent trade-offs between low latency and traditional performance metrics. We also review currently ongoing standardization activities in prominent standards associations, and discuss open problems for future research