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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (2): 426-436    DOI: 10.3785/j.issn.1008-973X.2023.02.021
电子与通信工程     
基于安全状态更新的信息年龄-能量权衡
刘蕾1(),李保罡1,2,*(),杨志1
1. 华北电力大学 电子与通信工程系，河北 保定 071003
2. 华北电力大学 河北省电力物联网技术重点实验室，河北 保定 071003
Age of information-energy tradeoff based on security status update
Lei LIU1(),Bao-gang LI1,2,*(),Zhi YANG1
1. Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China
2. Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China
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摘要：

考虑状态更新系统中传感器节点要尽可能及时地将随机生成的状态更新传送给基站，以信息年龄（AoI）作为时间新度量，同时引入平均保密年龄和保密年龄中断概率的性能指标，保证系统的通信安全性. 采用实用的截断自动重复请求（TARQ）方案，传感器节点持续传输不断更新当前状态，直到达到允许的最大传输次数或生成新的状态更新. 推导出平均AoI、平均峰值AoI的闭合形式表达式，以及平均能耗的表达式，通过优化物联网(IoT)设备的传输功率和平均传输功率约束下的最大允许传输次数来最小化平均AoI，实现系统的信息年龄-能量权衡. 仿真结果表明，在相同的平均传输功率约束下，采用的TARQ方案比允许无限次重传的经典自动重复请求（ARQ）方案的平均AoI更低，性能更好.
关键词： 信息年龄(AoI);  信息年龄-能量权衡;  物理层安全;  状态更新;  保密中断概率    
Abstract:

Considering that the sensor node in the status update system should transmit the status update randomly to the base station as timely as possible, Age of information (AoI) was introduced as a new time measurement, and the performance indexes of average confidentiality age and secrecy age outage probability were introduced to ensure the communication security of the system. A practical truncation of automatic repeated requests (TARQ) scheme was adopted, in which the sensor node continuously transmitted and updated the current state until the maximum number of transfers allowed was reached or a new state update was generated. The average AoI, the closed form expression of the average peak AoI, and the expression of average energy consumption were derived, and then the average AoI was minimized by optimizing the transmission power of Internet of Things (IoT) devices and the maximum allowed transmission times under the constraint of the average transmission power, to realize the information age-energy tradeoff of the system. Simulation results show that the TARQ scheme has lower average AoI and better performance than the classical automatic repeat request (ARQ) scheme which allows infinite retransmission under the same average transmission power constraint.
Key words: age of information (AoI)    age of information-energy tradeoff    physical layer security    status update    secrecy outage probability
收稿日期: 2022-05-20 出版日期: 2023-02-28
CLC:  TN 92  
基金资助: 国家自然科学基金资助项目 (61971190)；河北省自然科学基金资助项目(F2022502020)
通讯作者: 李保罡     E-mail: llan0825@163.com;baogangli@ncepu.edu.cn
作者简介: 刘蕾（1998—），女，硕士生，从事无线通信中信息年龄研究. orcid.org/0000-0003-2543-908X. E-mail: llan0825@163.com
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引用本文:

刘蕾,李保罡,杨志. 基于安全状态更新的信息年龄-能量权衡[J]. 浙江大学学报(工学版), 2023, 57(2): 426-436.

Lei LIU,Bao-gang LI,Zhi YANG. Age of information-energy tradeoff based on security status update. Journal of ZheJiang University (Engineering Science), 2023, 57(2): 426-436.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2023.02.021    或    https://www.zjujournals.com/eng/CN/Y2023/V57/I2/426

图 1  单天线传感器节点向基站传输状态更新信息的系统模型图
图 2  瞬时AoI演化图
参数 数值
衰落模型 瑞利衰落
频段/MHz 940
系统带宽/kHz 200
距离/m 200
路径损耗指数 2
信息率/kps 100
生成速率/（状态更新/时隙） 0.05，0.20，0.40
表 1  TARQ方案仿真参数设置
图 3  不同最大允许传输次数下TARQ方案的平均AoI随传输功率的变化
图 4  不同最大允许传输次数下TARQ方案的平均峰值AoI随传输功率的变化
图 5  不同传输功率下TARQ方案的平均发射功耗随最大允许传输次数的变化
图 6  不同平均传输功率约束和不同发射概率下的最佳允许传输次数
图 7  不同传输速率下，最佳平均AoI随平均发射功率约束的变化
图 8  状态更新概率对性能的影响
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