Hybrid NOMA/OMA Broadcasting-and-Buffer-State-Based Relay Selection
Hybrid NOMA/OMA Broadcasting-and-Buffer-State-Based Relay Selection
复制标题
DOI：
10.1109/tvt.2021.3054904
复制
发表时间：
2021-02-01
影响因子：
6.8
通讯作者：
Sugiura, Shinya
中科院分区：
文献类型：
--
作者：
Kochi, Jun;Nakai, Ryota;Sugiura, Shinya
在支持多中继的两跳协作网络中，我们提出了一种能够融合非正交多址(NOMA)和正交多址(OMA)概念的缓存辅助的中继选择方案。这是通过允许中继节点借助于源到中继广播模式在其缓冲器中共享公共信息分组来实现的。因此，所提出的中继选择方案在上行链路NOMA、下行链路NOMA、单播、源广播和协作波束形成的不同模式之间切换。基于马尔可夫链模型，推导了该方案的中断概率、吞吐量、平均时延和分集阶数的理论界。通过我们的分析和数值结果表明，该方案能够以自适应的方式切换到最佳模式之一，同时优于传统的缓冲区辅助协作方案。
In this paper, we propose a novel buffer-aided relay selection scheme that is capable of amalgamating the concepts of non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA) in the context of two-hop cooperative networks supporting multiple relays. This is enabled by allowing relay nodes to share a common information packet in their buffers with the aid of a source-to-relay broadcasting mode. Hence, the proposed relay selection scheme switches between diverse modes of uplink NOMA, downlink NOMA, unicast, source broadcasting, and cooperative beamforming. The theoretical bounds of the outage probability, throughput, average delay, and diversity order are derived for the proposed scheme, based on a Markov chain model. Through our analytical and numerical results, it is demonstrated that the proposed scheme is capable of switching to one of the best modes in an adaptive manner while outperforming the conventional buffer-aided cooperative schemes.