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面向月表多设施通信网络的通信塔部署方案 被引量:1
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作者 覃凯 顾术实 +4 位作者 张智凯 王玉 刘倩 赵晨 张钦宇 《系统工程与电子技术》 EI CSCD 北大核心 2024年第2期729-739,共11页
为在月球建立长期驻留的月面科研基地,实现局部网络的通信覆盖,提出了月球通信塔(lunar communication tower,LCT)的模型设计方法和多基站的部署方案。通过对月面探测任务与月表多设施通信网络的需求分析,设计了LCT的功能模块和模型结... 为在月球建立长期驻留的月面科研基地,实现局部网络的通信覆盖,提出了月球通信塔(lunar communication tower,LCT)的模型设计方法和多基站的部署方案。通过对月面探测任务与月表多设施通信网络的需求分析,设计了LCT的功能模块和模型结构。引入基于地理信息的覆盖场强预测模型,结合月表地形对通信链路的损耗影响,评估了多基站通信塔的有效覆盖与传输速率指标。在部署方案上,首先,在月球南极光照区范围内采用遍历法得到覆盖平均场强最大的主基站部署位置;随后,采用遗传算法最大化主基站半径10 km范围内的覆盖场强,对月球表面特定区域进行搜索,获取多个副基站的最佳部署位置;最后,针对集中式和分布式通信塔主、副基站的部署方案,进行了对应于CCSDS Proximity-1协议、长期演进(long term evolution,LTE)、Wi-Fi制式下覆盖性和传输速率的仿真分析,充分验证了月表多设施通信网络建设的可行性。 展开更多
关键词 月球通信塔 月表地理信息 ITU-RP.526模型 场强预测 遗传算法
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Layered Coded Cache Placement and Cooperative Delivery with Sharing Links in Satellite-Terrestrial Integrated Networks
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作者 gu shushi Chen Zihan +2 位作者 Wu Yaonan Zhang Qinyu Wang Ye 《China Communications》 SCIE CSCD 2024年第3期217-229,共13页
Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content deliver... Cooperative utilization of multidimensional resources including cache, power and spectrum in satellite-terrestrial integrated networks(STINs) can provide a feasible approach for massive streaming media content delivery over the seamless global coverage area. However, the on-board supportable resources of a single satellite are extremely limited and lack of interaction with others. In this paper, we design a network model with two-layered cache deployment, i.e., satellite layer and ground base station layer, and two types of sharing links, i.e., terrestrial-satellite sharing(TSS) links and inter-satellite sharing(ISS) links, to enhance the capability of cooperative delivery over STINs. Thus, we use rateless codes for the content divided-packet transmission, and derive the total energy efficiency(EE) in the whole transmission procedure, which is defined as the ratio of traffic offloading and energy consumption. We formulate two optimization problems about maximizing EE in different sharing scenarios(only TSS and TSS-ISS),and propose two optimized algorithms to obtain the optimal content placement matrixes, respectively.Simulation results demonstrate that, enabling sharing links with optimized cache placement have more than 2 times improvement of EE performance than other traditional placement schemes. Particularly, TSS-ISS schemes have the higher EE performance than only TSS schemes under the conditions of enough number of satellites and smaller inter-satellite distances. 展开更多
关键词 coded content placement cooperative delivery energy efficiency sharing links STINs
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Big Data Application Simulation Platform Design for Onboard Distributed Processing of LEO Mega-Constellation Networks
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作者 Zhang Zhikai gu shushi +1 位作者 Zhang Qinyu Xue Jiayin 《China Communications》 SCIE CSCD 2024年第7期334-345,共12页
Due to the restricted satellite payloads in LEO mega-constellation networks(LMCNs),remote sensing image analysis,online learning and other big data services desirably need onboard distributed processing(OBDP).In exist... Due to the restricted satellite payloads in LEO mega-constellation networks(LMCNs),remote sensing image analysis,online learning and other big data services desirably need onboard distributed processing(OBDP).In existing technologies,the efficiency of big data applications(BDAs)in distributed systems hinges on the stable-state and low-latency links between worker nodes.However,LMCNs with high-dynamic nodes and long-distance links can not provide the above conditions,which makes the performance of OBDP hard to be intuitively measured.To bridge this gap,a multidimensional simulation platform is indispensable that can simulate the network environment of LMCNs and put BDAs in it for performance testing.Using STK's APIs and parallel computing framework,we achieve real-time simulation for thousands of satellite nodes,which are mapped as application nodes through software defined network(SDN)and container technologies.We elaborate the architecture and mechanism of the simulation platform,and take the Starlink and Hadoop as realistic examples for simulations.The results indicate that LMCNs have dynamic end-to-end latency which fluctuates periodically with the constellation movement.Compared to ground data center networks(GDCNs),LMCNs deteriorate the computing and storage job throughput,which can be alleviated by the utilization of erasure codes and data flow scheduling of worker nodes. 展开更多
关键词 big data application Hadoop LEO mega-constellation multidimensional simulation onboard distributed processing
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空间物联网的分布式数据存储与传输技术 被引量:8
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作者 张钦宇 顾术实 +1 位作者 王野 薛佳音 《物联网学报》 2018年第4期22-30,共9页
从物联网的基本概念和相关技术出发,追踪当前世界低轨通信星座系统和我国构建天地一体化信息网络的发展趋势,提出了空间物联网的基本概念。空间物联网与传统卫星物联网不同,不仅是利用卫星中继解决远程的机器通信问题,而是在天地一体化... 从物联网的基本概念和相关技术出发,追踪当前世界低轨通信星座系统和我国构建天地一体化信息网络的发展趋势,提出了空间物联网的基本概念。空间物联网与传统卫星物联网不同,不仅是利用卫星中继解决远程的机器通信问题,而是在天地一体化信息网络架构下的一种泛在物联网体系,是地面物联网在全球立体空间层面的拓展,是多种信息技术融合而成的综合性应用服务平台。总结了海量数据业务特征下的空间物联网面临的主要挑战,包括系统负载过大、数据损毁丢失、链路频繁中断、能耗开销过高等数据存储与传输问题。进而提出了建立面向空间物联网应用服务的星地一体化分布式存储与传输系统的设计思路,介绍了关键技术,实现了海量信息业务的安全保障和跨域互联。最后,对未来空间物联网的研究热点方向提出了展望和思考。 展开更多
关键词 卫星物联网 天地一体化网络 空间物联网 分布式存储 分布式传输
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基于势博弈的负载已知超密集网络用户关联算法
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作者 于佳 梁亚超 +1 位作者 顾术实 王野 《物联网学报》 2019年第1期30-36,共7页
针对采用多点协调传输技术的异构超密集网络,提出了基于势博弈的负载已知用户关联算法。负载已知用户关联算法可在满足用户服务质量需求的前提下均衡基站负载,避免宏基站过载,同时可有效提升网络吞吐量。该算法适用于对数据传输速率有... 针对采用多点协调传输技术的异构超密集网络,提出了基于势博弈的负载已知用户关联算法。负载已知用户关联算法可在满足用户服务质量需求的前提下均衡基站负载,避免宏基站过载,同时可有效提升网络吞吐量。该算法适用于对数据传输速率有一定要求的物联网应用场景,仿真实验验证了算法的有效性。 展开更多
关键词 超密集网络 多点协调 负载已知 用户关联
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