降雪干扰下基于演化博弈的低轨量子卫星多用户切换策略  

Multi-User Switching Strategy of Evolutionary Game-Based Low-Orbit Quantum Satellite Under Snowfall Disturbance

作　　者：薛长春 聂敏 杨光 张美玲 孙爱晶 裴昌幸[2] Xue Changchun;Nie Min;Yang Guang;Zhang Meiling;Sun Aijing;Pei Changxing(School of Communications and Information Engineering&School of Artificial Intelligence,Xi'an University of Posts&Telecommunications,Xi'an 710121,Shaanxi,China;State Key Laboratory of Integrated Service Networks,Xidian University,Xi'an 710071,Shaanxi,China)

机构地区：[1]西安邮电大学通信与信息工程学院(人工智能学院),陕西西安710121 [2]西安电子科技大学空天地一体化综合业务网全国重点实验室,陕西西安710071

出　　处：《光学学报》2023年第24期240-248,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61971348,61201194);陕西省国际科技合作与交流计划项目(2015KW-013);陕西省自然科学基础研究计划(2021JM-464)。

摘　　要：低轨道量子卫星是构建全球天地一体化量子保密通信网的重要组成部分。单颗低轨量子卫星服务时间有限,为了保证卫星与地面用户之间的持续通信,地面终端需要及时切换至其他可供服务的卫星。为了解决降雪环境干扰下地面多用户量子卫星切换场景下的阈值判决问题,分析了大气雪环境对量子星地链路的衰减影响,提出了一种基于演化博弈的多属性量子卫星切换策略。根据用户的带宽、卫星剩余服务时间及链路衰减三个属性定义效用函数,根据星间传输时延、信道纠缠度定义开销函数,最终得到用户的收益函数,建立演化博弈切换模型。仿真结果表明,该策略具有稳定性和公平性,能够有效均衡卫星的负载,且与基于最低链路衰减和最优纠缠度的单属性切换策略相比,切换成功率分别提升了1.2%和1.5%,这对未来降雪干扰环境下低轨量子卫星网络的多用户动态切换有一定的参考意义。Objective Low-orbit quantum satellites are part of building a global secure communication network.However,as single quantum satellites move fast relative to ground terminals with limited service time and the satellite-ground quantum link is susceptible to atmospheric conditions(e.g.rain,snow,haze,etc.),ground end-users need to switch to other satellites available for service in time to meet the sustainable communication demands.In the common coverage area,if the user only chooses the currently proposed single-attribute decision strategy,such as the minimum communication elevation angle,the optimal entanglement degree or the minimum link attenuation,the optimal single attribute can be achieved with losing the advantage of other attributes.This will easily result in load imbalance and uneven resource allocation of quantum satellites,and even communications may be interrupted in serious cases.To this end,we consider the attenuation interference of snowfall on the satellite-ground link and the process of end-user-associated switching of quantum satellites,and build a multi-attribute evolutionary game switching model to achieve Nash equilibrium in the allocation of quantum satellite resources.Meanwhile,satellite resource allocation can be maximized to enhance the switching success rate of users in the low earth orbit(LEO)quantum satellite communication network.Methods Evolutionary game theory combines biological evolutionary properties with game theory to make the system stable through constant comparison and imitation in multiple choices.In actual quantum satellite switching,the users switching satellites at the same time do not know each other's state information in a completely rational way,which satisfies the non-rational conditions of evolutionary games.We analyze the quantum channel attenuation characteristics under snowfall and atmospheric turbulence according to the Gamma spectral distribution function of snow and obtain the variation of channel attenuation with transmission distance.The bandwidth that can be

关 键 词：量子卫星 演化博弈 收益函数 降雪 

分 类 号：TN929.1[电子电信—通信与信息系统] O431.2[电子电信—信息与通信工程]