Asmad Bin Abdul Razzaque, Hassaan Khaliq Qureshi, Andrea Baiocchi
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引用次数: 0
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.
物理层增强与经典随机存取协议的相互作用是本文的目标。连续干扰消除(SIC)是物理层的主要改进之一。考虑到随机接入协议的经典代表--插槽式 ALOHA 和信道感知多路访问 (CSMA),我们发现可以根据通信链路的频谱效率确定两种状态。在频谱效率较高的情况下,由 SIC 实现的多数据包接收效果有限。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,在频谱效率较低的情况下,和速率性能基本上取决于物理层 SIC 的能力,而 MAC 协议的影响微乎其微。传输功率动态范围的限制导致了节点间的不公平。然而,当系统在低频谱效率下达到总速率峰值时,不公平问题就会消失。信息年龄(AoI)指标也证实了这一点。这项工作的主要发现是,SIC 可以提高性能,同时仍能保持节点间通信信道的公平共享。在这种情况下,MAC 协议的作用似乎微乎其微,而 SIC 赋予的多数据包接收功能则在提供高总和速率、低能耗和低 AoI 方面表现突出。
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.