摘要
针对日益复杂的通信场景和日渐稀缺的频谱资源,以及信息新鲜度极其重要的现状。本文结合全双工(Full duplex,FD)、双向中继等技术,并基于短数据包传输(Short packet communication,SPC),构建一个选择中继辅助的全双工双向(Full duplex two-way,FDTW)模型。采用信息年龄(Age of Information,AoI)作为度量信息新鲜度的性能指标,为了深入研究中继辅助链路在此类模型中对AoI所带来的性能增益,同时考虑直连链路、中继辅助链路与中继的工作状态,设计三种传输方案:无中继辅助(Non relay-assisted,NRA)方案、放大转发中继辅助(Amplifyand-forward relay-assisted,AFRA)方案、解码转发中继辅助(Decode-and-forward relay-assisted,DFRA)方案。利用短包传输理论对每种方案下目的节点接收数据包的平均包错误率公式进行建模;利用图形分解法求解在每种方案下的平均信息年龄(Average Age of Information,AAoI)。其中在考虑中继辅助的方案中,AoI的演变较复杂,因此借助马尔可夫链进一步求解,这是对复杂传输情况下利用图形分解法求AoI方法的进一步补充。在仿真部分依据直连链路和中继辅助链路的相对状态进行分类讨论,结果表明,在直连链路信道状态相对较差时,中继辅助对AAoI的降低明显,最佳AAoI在AFRA方案下C为220 bits左右获得,可降低8.33%,在所考虑情况下由于数据包长度对误包率的影响,在数据包长度较小时,DFRA方案获得更优的AAoI,在数据包长度超过160~180 bits时,AFRA方案则获得更优的AAoI,同时随着直连链路状态不断变好,整体AAoI也会降低。
Given the increasingly complex communication scenarios and the scarcity of spectrum resources,along with the critical importance of information freshness,this paper proposes a full duplex two-way(FDTW)model that inte‐grates Full Duplex(FD)and bidirectional relay technologies based on Short Packet Communication(SPC).Utilizing the Age of Information(AoI)as a metric for measuring information freshness,three transmission schemes are de‐signed:Non relay-assisted(NRA),Amplify-and-forward relay-assisted(AFRA),and Decode-and-forward relay-assisted(DFRA).Mathematical models are developed using short packet transmission theory to analyze the average packet error rate at the destination node under each scheme.Graph decomposition methods are employed to compute the Average Age of Information(AAoI)for each scheme.Furthermore,considering the complexity of AoI evolution in relay-assisted schemes,Markov chain analysis is used as a supplementary method to graph decomposition,particularly under scenarios of transmission complexity.Simulation results demonstrate that relay assistance significantly reduces AAoI when the direct link channel conditions are poor.The optimal AAoI,approximately 220 bits,is achieved with the AFRA scheme,resulting in an 8.33%reduction.The DFRA scheme performs better in AAoI for small packet lengths,while the AFRA scheme outperforms the others when the packet lengths exceed 160~180 bits.Additionally,the overall AAoI decreases as the direct link conditions improve.
作者
牛夏秧
贾向东
张亮
薛凯来
NIU Xiayang;JIA Xiangdong;ZHANG Liang;XUE Kailai(College of Computer Science and Engineering,Northwest Normal University,Lanzhou,Gansu 730070,China;Wireless Communication Key Lab of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China)
出处
《信号处理》
CSCD
北大核心
2024年第12期2138-2150,共13页
Journal of Signal Processing
基金
国家自然科学基金(62261048)。
关键词
信息年龄
全双工
中继协作
短包通信
非正交多址接入
双向通信
age of information
full duplex
relay cooperation
short packet communication
non-orthogonal mul‐tiple access
two-way communication
