WCDMA网络规划中切换问题的研究

主要针对WCDMA网络规划中切换问题进行研究和分析。首先从移动通信系统切换的概念和功能入手．介绍常见的几种切换方式．并对WCDMA系统中的切换进行分类。然后介绍了切换流程以及切换过程所包含的测量控制、切换判决和切换执行等各个步骤。最后对切换带来的切换比例和开销问题进行了仿真分析,并给出了WCDMA规划中合理的切换比例和相关参数的设置。     

基于移动IPv6的分层式路由

移动节点在两个不同子网之间移动时将产生切换,这里简单介绍了移动IPv6的原理,对移动节点越区切换技术作了详细的分析HMIPv6,提出一种基于分层机制的移动IPv6路由管理模型。该模型支持路由优化,能在域内、域问移动时实现快速切换以减少延迟,提高网络资源利用率。     

蜂窝中继网络中协作切换策略研究

传统蜂窝网络架构存在着不少缺陷,小区边缘用户的服务质量远差于靠近基站中心的用户。通过部署中继,并完善其切换算法,提出了在该蜂窝中继网络中基于中继协作的切换策略,且对小区内及小区间切换策略进行细化,这样可以更精确的选择接入站点。比较了传统切换与协作切换中的切换阻塞率以及切换次数,通过仿真证明基于中继协作的协作切换的切换阻塞率小于传统切换,且基站间切换次数也得到降低,减轻了基站的负担,使系统性能得到提升。     

QoS-aware dynamic MAP selection schemes in HMIPv6 networks

We consider a dynamic Mobile Anchor Point (MAP) selection problem when there are both real-time and non-real time sessions in a Hierarchical Mobile IPv6 (HMIPv6) network. We propose schemes in which Mobile Nodes (MNs) holding real-time sessions register with the root MAP in a hierarchy of MAPs to reduce the inter-domain handovers while those with non-real time sessions select one either to balance the load or to reduce handover frequencies.     

SUPANET中的虚通道切换方式研究

以一种新的单物理层用户数据传输与交换平台体系结构(Single physical layer User-data transfer&switching Platform Architecture,SUPA)为研究背景,针对Internet与SUPA互联时由移动节点引起的虚通道切换问题,提出了两种基本的虚通道切换方式和一种混合的虚通道切换方式,并对每种虚通道切换方式进行了特点分析和仿真实验。仿真实验结果表明,混合切换方式的综合性能明显好于其他两种基本切换方式。     

Achieving high success rate in dual-arm handover using large number of candidate grasps,handover heuristics,and hierarchical search

Many dual-arm handover systems suffer from low success rates since the grasps are limited to a small number of candidate grasps and handover poses. Large number increases success rate but significantly explodes combinatorics and lowers system performance. How to efficiently exploit the large number of grasps and handover poses is a difficulty faced by many dual-arm manipulation researchers. This paper uses handover heuristics and hierarchical search to. challenge the difficulty. For one thing, it samples large number of grasps and handover poses to ensure success handover. For the other, it employs the handover heuristics to reduce combinatorics and the hierarchical search to reduce search space. Leveraging these technique leads to an algorithm that has high computational efficiency and high success rate. We report the algorithm in this paper and examine its performance using both statistical simulation analysis and real-world experiments. Results show that the algorithm can deal with thousands of grasps within a few seconds using a standard PC.     

被动微波/红外成像复合导引头交班仿真分析

通过对被动微波/红外成像舰空导弹复合导引头交班问题的研究,建立了复合导引头制导控制系统的数学模型,复合导引头跟踪回路主要由被动微波相位干涉仪与红外成像导引跟踪回路组成.以此模型为基础,进行了防御反舰导弹类目标典型运动情况下的交班过程仿真.分析了各因素在交班时对弹道扰动程度的影响.得出目标机动能力越强、速度越快、弹目距离越近,交班引起的弹道扰动越大;舰空导弹在拦截反舰导弹时,在反舰导弹巡航段进行拦截并交班时,交班过程引起的弹道扰动最小的结论.     

Advanced mobility management for reduced interference and energy consumption in the two-tier LTE-Advanced network

Femtocell deployment will play a key role for the wide adoption of LTE-Advanced, as it brings the access network closer to the end user in a cost-effective manner. This disruptive communication paradigm, however, necessitates the employment of advanced interference and mobility management to cope with the comparably denser yet unplanned network layout. This paper describes an advanced mobility management approach for the two-tier LTE-Advanced network, aiming to resourcefully utilize the femtocell superior characteristics in an energy-efficient and interference-aware manner. The key features of the proposed approach are (a) the exchange and utilization of standard signal quality measurements during the handover decision phase, to accurately estimate the mean user equipment (UE) transmit power on a per candidate cell basis, and (b) the use of a novel handover decision algorithm that jointly considers the impact of interference, power consumption, and user mobility. A comprehensive analysis of the required network signaling is provided, while extensive simulation results demonstrate that compared to existing approaches, the proposed approach attains improved performance at the cost of moderate increase of network signaling.     

Abis接口用户位置信息智能学习方法

在对Abis接口的信令进行解析分析时,绝大部分信令消息本身解码结果不携带位置区、小区等信息,而这些信息是后续应用分析所必须的维度。因此需要对不含位置小区信息的解码结果补全位置区、小区信息。这也是Abis接口信令监测系统所要解决的核心问题之一。通过Abis接口特殊的链路标识和系统消息的关联,可以得到信令消息当前小区的位置区、小区。通过关联呼叫接续过程中在小区间的切换过程,基于概率论,经过一段时间的自学习,可以学习邻区的位置区和小区号以及邻区的BCCH频点。     

一种无线切换认证协议的性能改进*

切换认证协议是确保移动节点在无线网络中多个接入点之间进行快速安全切换的关键。在设计切换认证协议时,必须充分考虑移动节点计算、存储能力低以及电池容量小等特点。针对无线局域网的切换认证协议HashHand双线性对运算消耗资源大的缺陷,提出了一种新的快速切换认证协议。该协议不使用对运算,仅使用加法群的点乘运算替代,提高了协议的效率。并且具有用户匿名性与不可追踪性,有条件的隐私保护性。用户与认证服务器满足互认证性,能够安全地协商会话密钥并且周期性地更新。该协议能有效地抵制重放攻击和拒绝服务攻击。