共查询到20条相似文献,搜索用时 265 毫秒
1.
TD-HSDPA无线网络规划浅析 总被引:1,自引:0,他引:1
文章通过分析HSDPA引入后对TD-SCDMAR4无线网络规划覆盖及容量方面的影响,得出结论:采用混合组网方式,HSDPA和R4共载频分时隙或者单独载频组网,HSDPA的引入不影响R4的规划,HSDPA无需单独规划,只需和R4规划统一考虑即可。由于不同覆盖电平和邻区干扰的位置会有不同的覆盖速率,HSDPA网络性能的评估较为困难,规划时可借助无线网络规划工具进行系统仿真,提供更为准确、细致的分析结果。 相似文献
2.
3.
4.
5.
无线网络覆盖是网络规划工作中的难点和重点,不同的覆盖策略会导致截然不同的网络投资、覆盖效果、工程难度和网络质量,UMTS网络规划也不例外,必须在合理的网络覆盖策略指导下进行.就典型商业楼宇的无线网络覆盖方案进行了分析和探讨,提出了室内覆盖系统的三种方案. 相似文献
6.
7.
梅辉 《电信工程技术与标准化》2004,(9):25-28
本文在简述GSM系统和UMTS系统不同规划特点的基础上,对WCDMA无线网络规划中的软容量和软覆盖问题进行了详细的阐述,并给出了仿真结果.另外对WCDMA系统初始布局阶段容量和覆盖的规划作了详细说明. 相似文献
8.
9.
详细阐述了接入光缆网的规划流程和规划原则,并结合网络规划实践经验,就需求的确认、光缆网与ODN的映射关系、不同业务需求对基础网络的要求、预覆盖与薄覆盖、资源命名等重点关注问题进行了详细分析。 相似文献
10.
随着LTE网络的大规模建设,2G/3G和LTE网络将在一定时期内长期并存。对各种制式的网络容量进行协调规划,首先需要对各种制式的网络配置数据和参数进行分析;其次是预测不同类型业务量的增长和网络负荷情况;最后,基于不同的驱动环境制定容量规划方案。本文总结了基于市场驱动、覆盖、容量和无线频谱等场景的容量规划方法。基于市场驱动的容量规划,网络为市场服务,业务需求预测成为对网络容量规划的依据;基于覆盖驱动的容量规划,首先满足覆盖要求,分步建站,逐步提高系统容量;基于容量驱动的容量规划,需要满足用户的服务质量要求,用户的业务需求和服务质量等级成为容量规划的依据;基于无线频谱的容量规划,需要在不同制式系统之间合理分配容量,以达到频率效率最优。 相似文献
11.
针对无线传感网预覆盖过程中存在覆盖盲区以及数据频繁重传而导致的节点覆盖抑制现象,提出了一种基于拨备满足模型的无线传感网网络覆盖算法。设计一种新的无线传感网节点覆盖模型,并构建覆盖指数、覆盖强度、覆盖均衡评估系数等评估维度,快速评估节点覆盖质量。再计算覆盖均衡评估系数,并采用拨备模型优化覆盖质量,确定覆盖性能优越的备用工作节点。随后,基于覆盖相似性原则评估工作节点覆盖性能,设计了节点首次覆盖评估方法,按节点移动路径依次评估覆盖指数统计均值,并根据目标节点进入覆盖区域的先后,逐次激活性能最佳的工作节点进行监测。仿真实验表明:与当前无线传感网常数节点覆盖方案相比,所提方案具有更高的网络覆盖率、更短的覆盖启动时间和更少的工作节点数目。 相似文献
12.
13.
能耗与覆盖问题是无线传感器网络研究领域的基本问题,也是一个重点问题。针对传感器节点所呈现的同构性特点,提出了一种带有可控动态参数的优化覆盖算法(OCCDP)。该算法首先给出了3节点联合覆盖时,最大无缝覆盖率的求解过程;其次,给出了在监测区域内存在传感器节点覆盖时,覆盖质量期望值求解方法以及与邻居节点进行覆盖比对时覆盖率的判定方法;当存在冗余覆盖时,给出了任意传感器节点处于冗余节点覆盖时的覆盖率的计算过程;最后,通过仿真实验与其他算法在覆盖质量和网络生存周期等方面进行对比,其性能指标平均提升了11.02%和13.27%,从而验证了提出算法的有效性和可行性。 相似文献
14.
15.
由于5G使用频谱资源的频段相对较高,其绕射能力及电磁波穿透能力相对较弱,因此存在室外基站覆盖、室内隔墙传输难度较大的问题。为满足室内深度覆盖需求,需要做好室内深度覆盖规划。文中通过对5G室内深度覆盖基本情况的介绍,分析了覆盖规划原则,并重点探讨了深度覆盖的解决方案,旨在提高5G室内覆盖效果,保证深度覆盖规划方案的质量。 相似文献
16.
17.
关于WLAN覆盖的研究 总被引:1,自引:0,他引:1
针对目前WLAN建设中普遍存在的覆盖范围小、覆盖信号弱及覆盖不连续等覆盖问题,通过采用衰减因子模型对2.4 GHz频段进行链路预算分析,得出室内独立型AP及室内分布型AP、室外独立型AP等3种不同覆盖方式下的WLAN理论覆盖范围。根据不同覆盖方式的覆盖范围,结合不同的应用场景,提出了AP密集覆盖和室外AP+高增益定向天线等2种加强WLAN覆盖的措施,为WLAN覆盖提供了有效的解决思路。 相似文献
18.
19.
Nadeem Ahmed Salil S. Kanhere Sanjay Jha 《Wireless Communications and Mobile Computing》2011,11(1):23-45
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. 相似文献
20.
Cell-coverage estimation based on duration outage criterion for CDMA cellular systems 总被引:2,自引:0,他引:2
Previous papers addressing coverage analysis for code-division multiple-access (CDMA) cellular networks have focused on cell expansion from soft handoff or estimation of cell coverage based on an instantaneous outage criterion. Instantaneous outage estimates of cell coverage are a worst case assessment in that the predicted coverage as a function of the number of users is necessarily smaller than the actual coverage. We present the theoretical framework for estimating reverse-link cell coverage based on a duration outage criterion. Our results show that coverage estimates based on duration outage are typically 15%-30% larger than coverage estimates based on instantaneous outage when the correlation distance of the large-scale shadowing environment is small. We compare our theoretical duration outage results of cell coverage with simulated results that considered various large-scale shadowing conditions as well as Rayleigh small-scale fading. The theoretical and simulated coverage results are found to be in very good agreement. The simulations confirm that the presented theoretical duration outage analyses provide accurate and realistic estimates of reverse-link CDMA cell coverage. 相似文献