Asmad Bin Abdul Razzaque, Hassaan Khaliq Qureshi, Andrea Baiocchi
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引用次数: 0
Abstract
Abstract The interplay of physical layer enhancements and classic random access protocols is the objective of this paper. Successive interference cancellation (SIC) is among the major enhancements of the physical layer. Considering the classic representatives of random access protocols, Slotted ALOHA and Channel Sensing Multiple Access (CSMA), we show that two regimes can be identified as a function of the communication link spectral efficiency. In case of high levels of spectral efficiency, multi-packet reception enabled by SIC is of limited benefit. Sum-rate performance is dominated by the effectiveness of the Medium Access Control (MAC) protocol. On the contrary, for low spectral efficiency levels, sum-rate performance is essentially dependent on physical layer SIC capability, while the MAC protocol has a marginal impact. Limitations due to transmission power dynamic range are shown to induce unfairness among nodes. However, the unfairness issue fades away when the system is driven to work around the sum-rate peak achieved for low spectral efficiency. This can also be confirmed by looking at Age of Information (AoI) metric. The major finding of this work is that SIC can boost performance, while still maintaining a fair sharing of the communication channel among nodes. In this regime, the MAC protocol appears to play a marginal role, while multi-packet reception endowed by SIC is prominent to provide high sum-rate, low energy consumption, and low AoI.
摘要本文主要研究物理层增强与经典随机接入协议的相互作用。连续干扰消除(SIC)是物理层的主要增强之一。考虑随机接入协议的经典代表,有槽ALOHA和信道感知多址(CSMA),我们证明了这两种机制可以被识别为通信链路频谱效率的函数。在高频谱效率的情况下,由SIC实现的多包接收的好处有限。和速率性能主要取决于介质访问控制(MAC)协议的有效性。相反,对于低频谱效率水平,和速率性能主要取决于物理层SIC能力,而MAC协议的影响很小。由于传输功率动态范围的限制导致节点间的不公平。然而,当系统被驱动在低频谱效率的和速率峰值附近工作时,不公平问题就消失了。这也可以通过查看信息时代(Age of Information, AoI)指标来证实。这项工作的主要发现是SIC可以提高性能,同时仍然保持节点之间通信通道的公平共享。在这种情况下,MAC协议似乎起着边缘作用,而SIC赋予的多包接收以提供高速率、低能耗和低AoI而突出。
期刊介绍:
Annals of Telecommunications is an international journal publishing original peer-reviewed papers in the field of telecommunications. It covers all the essential branches of modern telecommunications, ranging from digital communications to communication networks and the internet, to software, protocols and services, uses and economics. This large spectrum of topics accounts for the rapid convergence through telecommunications of the underlying technologies in computers, communications, content management towards the emergence of the information and knowledge society. As a consequence, the Journal provides a medium for exchanging research results and technological achievements accomplished by the European and international scientific community from academia and industry.