CDMA网络海域覆盖解决方案

简述海域覆盖的特点和必要性,并探讨了海域无线传播模型和链路预算,提出海域覆盖基站解决方案,重点分析了站址选择、天线选型、改善海域超远覆盖的技术手段、海岛基站配套建设方案等.     

无线基站用于海域覆盖时出现的问题及其解决方法

首先提出了用GSM900无线基站在做近海海域覆盖时会出现的一些问题，并阐述了其原因：随后给出了处理这些问题的解决方案，最后提供了一个在实际工程中对某海域覆盖型基站的测试实例。     

CDMA2000系统海域覆盖浅析

随着经济的发展,海域通信日益增多,沿海覆盖也是日益受到重视。从影响海域覆盖的因素、覆盖规划原则、天线选择、覆盖方案等方面介绍了cDMA无线网络的海域覆盖。     

基于卫星传输的远洋海域CDMA和LTE覆盖方案

远洋海域由于自然条件局限,用户使用较多的通信方式是卫星电话和船载电台,主要用于公务用途。对个人用户来说,通信资费较为昂贵且无法满足个人数据业务的需求。文章利用卫星传输技术建设远洋船栽CDMA和LTE通信系统,解决远洋海域覆盖问题,满足远洋海域用户日益增长的语音业务和数据移动办公需求。在大幅度提升海上用户语音和数据业务体验感知的同时,大幅降低通信资费。     

CDMA网络海域覆盖分析研究

海域覆盖具有覆盖距离远的特点.通过对江苏海域CDMA网络覆盖仿真研究,出了一种海域网络的分层覆盖方法.结合实际网络特点,过网络仿真分析调整实际CDMA网络的工作参数,到指导实际网络的海域覆盖方法,用于网络的优化.     

基于5G的海域覆盖解决方案研究及探索

随着海洋经济的发展，海上高速通信的需求开始显现。本文针对海域5G网络覆盖规划建设以及性能提升方面进行技术方案研究和探索，并以某省海域5G网络实测覆盖为例，对方案中运用到的解决方案进行了数据分析论证和实际效果验证，为后续海域5G网络覆盖提供可借鉴的经验。     

CDMA网络海域覆盖分析研究

海域覆盖具有覆盖距离远、受海面情况影响大的特点。具有重要的经济和社会意义。通过对某省海域CDMA（CodeDivisionMultipleAccess．码分多址）网络实际信号的海测数据分析,结合各种情况下海域覆盖仿真分析研究,提出了一种海域网络的分层覆盖方法。通过规划合适的远近海域区域,结合远近海区域CDMA信号覆盖特点,在远近海采用最优化的网络组合,达到远海覆盖尽量远,近海完全覆盖。同时分析并调整实际CDMA网络的工参,得到指导实际网络的海域覆盖方法,应用于网络的建设和优化。     

理想情况下海域网络覆盖分析

海域覆盖具有覆盖距离远、受海面情况影响大的特点。通过对某省海域CDMA(码分多址)网络覆盖仿真研究,文章提出了一种海域网络的分层覆盖方法,通过规划合适的远近海域区域,结合远近海区域CDMA信号覆盖特点,在远近海采用最优化的网络组合,达到远海覆盖尽量远、近海完全覆盖。同时分析并调整实际CDMA网络的工程参数,得到指导实际网络的海域覆盖方法,应用于网络的优化。     

基于两级接力的5G海域超远覆盖创新实践

海洋覆盖的关键是站点的海拔高度,对于沿海以平原为主的地区,常规手段难以实现5G海域超远覆盖。提出一种基于两级接力的5G海域超远覆盖方案,通过在海上平台部署海基站,与陆地岸基站实现两级接力的方式实现海域超远覆盖,并通过实测验证了方案的有效性。     

CDMA网络海域覆盖工程方案探讨

文章简述在近海海域实施无线网络覆盖的必要性,通过理论分析、测试数据,结合在北方某市海域网络覆盖工程经验,提出一套工程实施方案以供探讨。     

基于感知距离调节的无线传感器网络节能区域覆盖

传感器节点能够感知的物理世界的最远距离称为节点的感知距离。该文研究了基于节点感知距离调节的无线传感器网络节能区域覆盖方案,该方案通过设定合理的节点感知距离,使得传感器网络在满足区域覆盖要求的同时,能量消耗最低。首先将区域覆盖性能和网络能量消耗模化成网络节点感知距离的函数,然后将节能覆盖问题模化成带约束条件的优化问题,最后给出了基于网络区域划分的优化模型求解方法。仿真结果表明,与传统覆盖方案比较,所提方案在满足覆盖要求的同时,有效降低了网络能量消耗。     

Area coverage adaptive nulling from geosynchronous satellites: Phased arrays versus multiple-beam antennas

Antenna design trade-offs associated with providing an area coverage communication link via a geosynchronous satellite, where the geographical area to be serviced by the associated adaptive antenna system is characterized by a narrow-cone angle directed at an a priori known region on the earth's surface, are considered. Interference sources within and just surrounding the coverage area are adaptively nulled; interference sources located far from the coverage area are minimized by designing the antenna system to have low sidelobes outside the coverage area. This minimizes the number of adaptive channels which must be processed, with subsequent decrease in satellite weight and power requirements. The antenna design trade-off is between the phased array (PA) and the multiple-beam antenna (MBA). Three specific performance factors are considered in the MBA/PA design trade-off: susceptibility to out-of-coverage-area interference sources which use up the adaptive degrees of freedom allocated to the desired coverage area; effects of reduced link margin for low-gain thinned arrays; and nulling bandwidth restrictions imposed on spread spectrum communication systems. Three classes of PA's are considered: filled arrays, high gain thinned arrays, and low-gain thinned arrays.     

基于NB-IoT网络覆盖的最小投资方法研究

构建了NB-IoT网络与需求满足度的评估体系,该体系基于有4G覆盖区域的A-GPS MR数据和无覆盖区域的仿真预测,考虑了网络制式的覆盖差异因子、不同典型场景覆盖差异因子及不同承载频率的覆盖差异因子,形成20×20 m的、可迭代更新的底层NB-IoT网络覆盖数据库,并利用最小投资算法成功实现NB-IoT网络与市场满足度评估以及最小开站规模评估,实现网络覆盖评估和投资效益最大化,加快5G的mMTC场景应用业务推广。     

A pragmatic approach to area coverage in hybrid wireless sensor networks

Success of Wireless Sensor Networks (WSN) largely depends on whether the deployed network can provide desired area coverage with acceptable network lifetime. This paper seeks to address the problem of determining the current coverage achieved by the non‐deterministic deployment of static sensor nodes and subsequently enhancing the coverage using mobile sensors. We identify three key elements that are critical for ensuring effective area coverage in Hybrid WSN: (i) determining the boundary of the target region and evaluating the area coverage (ii) locating coverage holes and maneuvering mobile nodes to fill these voids, and (iii) maintaining the desired coverage over the entire operational lifetime of the network. We propose a comprehensive solution that addresses all of the aforementioned aspects of the area coverage, called MAPC (mobility assisted probabilistic coverage). MAPC is a distributed protocol that operates in three distinct phases. The first phase identifies the boundary nodes using the geometric right‐hand rule. Next, the static nodes calculate the area coverage and identify coverage holes using a novel probabilistic coverage algorithm (PCA). PCA incorporates realistic sensing coverage model for range‐based sensors. The second phase of MAPC is responsible for navigating the mobile nodes to plug the coverage holes. We propose a set of coverage and energy‐aware variants of the basic virtual force algorithm (VFA). Finally, the third phase addresses the problem of coverage loss due to faulty and energy depleted nodes. We formulate this problem as an Integer Linear Program (ILP) and propose practical heuristic solutions that achieve similar performance as that of the optimal ILP solution. A guiding principle in our design process has been to ensure that the MAPC can be readily implemented in real‐world applications. We implemented the boundary detection and PCA algorithm (i.e., Phase I) of the MAPC protocol on off‐the‐shelf sensor nodes and results show that the MAPC can successfully identify boundary nodes and accurately determine the area coverage in the presence of real radio irregularities observed during the experiments. Extensive simulations were carried out to evaluate the complete MAPC protocol and the results demonstrate that MAPC can enhance and maintain the area coverage, while reducing the total energy consumption by up to 70% as compared with the basic VFA. Copyright © 2010 John Wiley & Sons, Ltd.     

卫星覆盖区测试方法及工程应用

卫星覆盖区是卫星系统为用户提供服务能力的重要指标之一,也是卫星系统测试的重要内容。研究通过几个主要评判参数:出站链路卫星发射EIRPs、用户接收误码率,入站链路卫星G/T值的测试评判卫星覆盖区范围。同时介绍并对比了目前卫星覆盖区测试的2种测试方法:移动测试法和卫星姿态偏置测试法,以及测试所需测试设备组成和测试流程,并通过卫星覆盖区测试的工程实践说明了测试的可行性和有效性。     

基于用户感知的WCDMA网络深度覆盖评估研究

提出了一种WCDMA网络中关联用户感知和路测数据的深度覆盖评估方法,通过对无线信令中的传播时延和路测数据进行关联分析,能较准确地确定用户分布范围,精确评估基站小区覆盖区域内的用户感知和深度覆盖水平。该方法能主动有效地发现深度覆盖不足的区域,为精细化优化提供了参考。     

中国联通高铁覆盖GSM＆DCS混合组网方案介绍

以胶济客运专线（高密段）的覆盖方案为例,通过理论分析和现场模拟测试,验证了市区段高铁采用DCS1800覆盖的可行性,提出了高铁覆盖GSM＆DCS混合组网方案。其中在郊区路段采用GSM900进行专网覆盖,市区路段引入DCS1800进行专网覆盖。     

一种规划无线网络目标覆盖区域的方法

本文提出一种新的目标覆盖区域规划方法,首先建立了统一的考核指标体系,对覆盖区域进行综合评估。然后,在上述覆盖区域评估结果的基础上,编制网络覆盖区域自动选取的算法,使得通过软件方式计算目标覆盖区域成为可能。通过该技术方法,可更加全面、准确、系统、便捷的完成网络覆盖区域规划。     

Optimal Location of the Secondary Base Station for Broadcasting Cognitive Radio Networks with Spectrum Underlay

This paper focuses on where to place the secondary base station (SBS) so as to obtain the maximum coverage area for a broadcasting cognitive radio network with spectrum underlay. Aiming to solve this problem, the coverage area is first obtained, considering the interference constraints for the primary user (PU) and quality of service constraints for the secondary user. It is found that the location of the SBS takes an important role in the coverage area determination. Then, an optimal location of the SBS is derived to maximize the coverage area in the broadcasting cognitive radio network. Further, considering the local environment can largely determine the characteristics of radio propagation in practice, a typical scenario with an obstacle located between the PU and SBS is analyzed. Numerical results show that the optimal location of the SBS is different with different locations of the obstacle, and will converge to a fixed point as the distance between the PU and the obstacle increases when the obstacle is assumed to be a hill, which is exactly the optimal location of the SBS without the obstacle.