Full-Duplex SIMO Relaying for Machine-Type Communications in Cellular Networks

Utku Tefek, Teng Joon Lim
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引用次数: 3

Abstract

To address massive access in machine-type communication (MTC), we consider in-band full- duplex (IBFD) relays to aggregate MTC packets. IBFD allows devices to receive and transmit concurrently on the same frequency band, potentially doubling the spectral efficiency. On the downside, the use of IBFD raises the interference due to an increased density of simultaneously transmitting nodes. This paper deals with a key trade-off between the increased spectral efficiency and interference in utilizing IBFD uplink relays in a densely deployed MTC network. Using stochastic geometry, we develop a framework to evaluate the end-to-end outage probability and uplink data aggregation rate. The model consists of MTC devices and IBFD relay nodes that forward MTC packets to base stations (BSs) over single-input-multiple-output channels. The BSs employ linear zero-forcing filters to cancel the interference from their associated relay nodes which may transmit simultaneously on the same frequency band. We show the somewhat surprising result that IBFD relaying does not lead to performance gains over half-duplex relays, when devices and relays are independently and homogeneously distributed in space.
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蜂窝网络中机器型通信的全双工SIMO中继
为了解决机器型通信(MTC)中的大量访问问题,我们考虑了带内全双工(IBFD)中继来聚合MTC数据包。IBFD允许设备在同一频带上同时接收和发送,可能使频谱效率翻倍。缺点是,由于同时传输节点的密度增加,使用IBFD会增加干扰。本文讨论了在密集部署的MTC网络中利用IBFD上行中继提高频谱效率和干扰之间的关键权衡。利用随机几何,我们开发了一个框架来评估端到端中断概率和上行数据聚合率。该模型由MTC设备和IBFD中继节点组成,IBFD中继节点通过单输入多输出通道将MTC数据包转发给基站。BSs采用线性强制零滤波器来消除可能在同一频带上同时传输的关联中继节点的干扰。当设备和继电器在空间中独立且均匀分布时,IBFD继电器不会比半双工继电器带来性能提升,这一结果有些令人惊讶。
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