基于稀疏资源模式的物联网上行免授权接入解决方案

H. Huang, Jian Song
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引用次数: 2

摘要

随着物联网(IoT)的快速发展,大量设备同时接入网络变得至关重要。目前的4G多址方案是传统的基于授权的方案,需要接入系统的权限。随着设备数量的增加,它将遭受拥塞和过载的困扰。因此,用户不需要通过四步握手过程访问信道资源的免授权随机接入最近引起了人们对5G新无线电的广泛兴趣。此外,非正交技术是处理无授权方案中频繁碰撞的有效方法。本文提出了一种基于稀疏开关资源模式的无授权非正交随机存取(GF-NORA)方案。开关模式允许用户连续或间断地占用资源块。资源模式的稀疏性有助于改变信号中非碰撞部分的比例分布。由于资源模式的灵活使用,支持多种操作模式。仿真结果表明,当采用单用户检测时,该方法可以有效地改变信号中非碰撞部分的比例分布。通过选择合适的编码调制方案从非碰撞部分恢复消息,与开槽ALOHA相比,可以降低中断概率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Uplink Grant-Free Access Solution Based on Sparse Resource Pattern for IoT
With the rapid development of the Internet of things (IoT), simultaneous access of the massive devices to the network becomes essential. The current multiple access scheme in 4G is a traditional grant-based scheme which needs permission to access the system. It will suffer from congestion and overloading as the number of device increases. Therefore, grant-free random access, where users do not need to access channel resource through four step handshake process, recently gained wide interest in 5G new radio. Moreover, non-orthogonal technology is an effective way to deal with frequent collisions in the grant-free scheme. In this paper, we propose a grant-free non-orthogonal random access (GF-NORA) scheme based on sparse on-off resource pattern. The on-off pattern enables users to occupy resource blocks continuously or discontinuously. And the sparsity of resource pattern is helpful to change the distribution of non-collision part’s ratio of signals. A variety of operating modes are supported because of the flexible use of resource patterns. The simulation results indicate that the proposed method can effectively change the distribution of non-collision part’s ratio of signals when adopting the single user detection. By selecting the appropriate coded-modulation scheme to recover messages from the non-collision part, the outage probability will be reduced compared with slotted ALOHA.
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