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全球能源互联网的监测、调度、授时、同步及定位等业务均需要能提供广域覆盖、泛在灵活接入服务的可靠通信网络。针对该需求,首先分析阐述全球能源互联背景下各种新型业务需求及其特点,并总结各种业务的共性数据特征;然后论述卫星通信技术的特点以及与全球能源互联网业务特点与数据传输需求的高度契合性,最终提出融合卫星通信网络的全球能源互联网天空地协同网络体系架构。其以IP技术为基础,各层网络通过星间、星地、星空、空空、空地以及地面有线、无线链路连接起来,构建全球覆盖的一体化网络体系。 相似文献
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Cloud computing is one of the space-ground integration information network applications.Users can access data and retrieve service easily and quickly in cloud.The confidentiality and integrity of the data cloud have a direct correspondence to data security of the space-ground integration information network.Thus the data in cloud is transferred with encrypted form to protect the information.As an important technology of cloud security,access control should take account of multi-factor and cipher text to satisfy the complex requirement for cloud data protection.Based on this,a proxy re-encryption based multi-factor access control (PRE-MFAC) scheme was proposed.Firstly,the aims and assumptions of PRE-MFAC were given.Secondly,the system model and algorithm was defined.Finally,the security and properties of PRE-MFAC were analyzed.The proposed scheme has combined the PRE and multi-factor access control together and realized the multi-factor permission management of cipher text in cloud.Meanwhile,it can make the best possible use of cloud in computing and storing,then reduce the difficulty of personal user in cryptographic computing and key managing. 相似文献
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天地一体化信息网络通过多轨道卫星星座将陆基、海基、空基网络连接起来,构成覆盖全球的一体化通信网络,可以为我国海洋、航空、航天、信息普惠、商用全球宽带通信等多种应用场景提供全新的解决方案,为“一带一路”等国家战略实施提供通信应用及服务支撑。在充分汲取国际先进技术、产业和应用服务经验的基础上,通过开展典型应用示范系统的建设,可以进一步验证天地一体化信息网络的能力,牵引出更多应用需求和商业模式,并就未来天地一体化信息网络典型应用系统的建设提出了一些初步的考虑和设想,为全球各类用户提供基础公共服务及专业服务。 相似文献
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提出了基于资源重组的可重构柔性网络(RFNet)。RFNet中的网络服务是构件的有机组合,并且能够根据新的业务需求,利用构件复用思想,从软硬件出发重构出满足需求的新的网络服务。首先介绍RFNet的体系结构,然后提出RFNet的"资源管理—承载网映射—网络服务映射"的流程机制。经过评估,提出的RFNet"资源管理—承载网映射—网络服务映射"机制能够很好地支持差异化服务的构建与共存,并且基于负载均衡的可重构服务承载网映射算法RSCNM在网络构建成功率、最大节点强度、平均链路利用率和构建平均收益上具有明显的优势。 相似文献
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车联网通信系统中通信节点的高移动性、移动行为的复杂性,使得此场景下通信业务呈现数据实时交互性强、空时分布不均、尺度多变、规律复杂的特征,导致传统的车联网网络部署、资源调配难以有效满足用户的差异化服务质量需求。因此,迫切需要设计“车-人-路-云”泛在互联的智能异构车联网网络,通过充分挖掘车辆行为数据的潜在价值,精准预测、刻画车辆行为的空时分布特性,以提升车联网资源利用率、改善车联网服务性能。该文全面梳理了国内外在车辆行为分析、网络部署与接入以及资源优化方面的相关工作,重点阐述了智能车联网关键使能技术,即如何借助先进的人工智能、数据分析技术,探索车联网中车辆行为的空时分布特性,建立车辆行为预测模型,进行智能化网络部署与多网接入、动态资源优化管理,实现高容量、高效率的智能车联网通信。 相似文献
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In mobile cloud computing(MCC) systems,both the mobile access network and the cloud computing network are heterogeneous,implying the diverse configurations of hardware,software,architecture,resource,etc.In such heterogeneous mobile cloud(HMC) networks,both radio and cloud resources could become the system bottleneck,thus designing the schemes that separately and independently manage the resources may severely hinder the system performance.In this paper,we aim to design the network as the integration of the mobile access part and the cloud computing part,utilizing the inherent heterogeneity to meet the diverse quality of service(QoS)requirements of tenants.Furthermore,we propose a novel cross-network radio and cloud resource management scheme for HMC networks,which is QoS-aware,with the objective of maximizing the tenant revenue while satisfying the QoS requirements.The proposed scheme is formulated as a restless bandits problem,whose "indexability" feature guarantees the low complexity with scalable and distributed characteristics.Extensive simulation results are presented to demonstrate the significant performance improvement of the proposed scheme compared to the existing ones. 相似文献
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介绍了支持透明跨内外网的制播分离架构所需要的软件体系设计架构以及作为制作系统核心的音频制作编辑系统提供的功能。还简要介绍了要实现安全、透明的内外网互联的关键设备、媒体网闸的安全机制和内部工作原理。结合东莞广播电视台和其他电台对新一代播出与制作系统中的一些需求,介绍了架构设计方面的原理,并结合一些具体产品来思考如何建设一个比较符合现代媒体要求、制播分离要求、适应因特网时代的制播系统。 相似文献
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Carlos Figuera Eduardo Morgado Esteban Municio Javier Sim‐Reigadas 《International Journal of Communication Systems》2019,32(15)
Management in wireless backhaul networks is a challenging task, especially in rural and isolated environments. In these scenarios, the backhaul network usually consists of a set of heterogeneous wireless links that provide limited and variable bandwidth to the access networks, often 3G/4G small cells. Because of the highly constrained nature of this type of backhaul network, intelligent and joint management in both the backhaul network and the access network is crucial in order to avoid performance degradation caused by traffic congestion. In order to avoid the saturation in the backhaul network, access networks should consider the backhaul state when taking decisions in the admission control and scheduling procedures. However, no standardized mechanisms currently exist for sharing management information between both networks. In this work, we propose to use the Explicit Congestion Notification (ECN) bit in the outer IP headers present in the Iuh 3GPP IPSec‐enabled interfaces in order to notify the backhaul congestion state to the access network. We analyze for the referred scenario, compatibility and security details, validating our approach by running numerically simulations and implementing the notification mechanism. Our low complexity approach offers 2% accuracy and backhaul update latency lower than 10 ms during 80% of the time, which makes the solution appropriate for admission control and scheduling intervals in small cells. 相似文献
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宽带综合业务HFC网 总被引:3,自引:2,他引:1
在宽带综合业务接入网中,HDSL和ADSL技术受到双绞线性能的限制,不能满足高质量服务要求,只是一种过渡性的技术,以HFC为基础的CATV宽带接入网既能满足近期要求,经过升级亦能满足将来全数字宽带接入网的要求,在设计宽带接入网时,要解决网络中系统的双向传输,接口技术,信号变换,调制解调,频谱安排,网管等一系列技术问题,要设计符事宽带服务要求的前端,光节点及终端设备。目前一些技术已经可供网络升级使用 相似文献
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无线网状网组网技术及实验研究 总被引:2,自引:0,他引:2
面对日益增长的高速无线因特网接入需求,传统的无线接入方式,如蜂窝网、无线局域网(WLAN)面临许多挑战,而无线网状网(WMN)作为因特网“最后一公里”接入方案,提供一种灵活而低成本的多跳通信,也将成为各种无线网络融合的主要技术。针对这一极具发展前途的网络结构,从WMN的两种典型应用出发,文章从网络配置、功率控制、移动性管理和接入控制以及路由协议设计等方面说明了WMN组网中的相关问题和技术,对WMN与移动自组织(Ad hoc)网路由协议的设计进行了对比,并给出了一种基于WLAN和第二层交换技术的WMN试验床实现方案。 相似文献
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针对网络环境下多自治域之间互操作安全需求,提出了一个基于角色和映射规则的跨域使用控制模型CD_UCON(Cross-Domain UCON)。该模型结合了基于角色的访问控制(RBAC)模型的权限机制和使用控制模型(UCON)的框架。为实现属性易变性和访问控制连续性,CD_UCON对UCON模型中的属性和授权规则进行扩展;通过映射规则实现跨域交互。以CD_UCON模型在物资采购管理系统中的应用分析说明了该模型的可行性。 相似文献