Age of Information: Can CR-NOMA Help?
Age of Information: Can CR-NOMA Help?
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DOI：
10.1109/tcomm.2023.3306573
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发表时间：
2022-09
影响因子：
8.3
通讯作者：
Z. Ding;R. Schober;H. Poor
中科院分区：
文献类型：
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作者：
Z. Ding;R. Schober;H. Poor
本文的目的是利用认知无线电启发的NOMA(CR-NOMA)传输来降低无线网络中的信息年龄。具体地，通过利用不同数据生成模型的关键特征并将CR-NOMA作为附加应用到基于传统的正交多址(OMA)的网络中，开发了两种CR-NOMA传输协议。CR-NOMA的实现对传统OMA网络的破坏很小，这意味着所提出的CR-NOMA协议可以在基于OMA的各种通信系统中实际实现。为了便于性能评估，建立了NOMA协议实现的AOI的闭合形式表达式，并进行了渐近研究，以确定在无线网络中使用NOMA来降低AOI的两个好处。其一是NOMA的使用为用户提供了更多的传输机会，这意味着用户可以更频繁地更新自己的基站。另一种是NOMA的使用可以减少接入时延，即用户被调度比OMA情况下更早地发送，这对于提高无线网络中可用的数据的新鲜度是有用的。
The aim of this paper is to exploit cognitive-radio inspired NOMA (CR-NOMA) transmission to reduce the age of information in wireless networks. In particular, two CR-NOMA transmission protocols are developed by utilizing the key features of different data generation models and applying CR-NOMA as an add-on to a legacy orthogonal multiple access (OMA) based network. The fact that the implementation of CR-NOMA causes little disruption to the legacy OMA network means that the proposed CR-NOMA protocols can be practically implemented in various communication systems which are based on OMA. Closed-form expressions for the AoI achieved by the proposed NOMA protocols are developed to facilitate performance evaluation, and asymptotic studies are carried out to identify two benefits of using NOMA to reduce the AoI in wireless networks. One is that the use of NOMA provides users more opportunities to transmit, which means that the users can update their base station more frequently. The other is that the use of NOMA can reduce access delay, i.e., the users are scheduled to transmit earlier than in the OMA case, which is useful to improve the freshness of the data available in the wireless network.