移动IPv6技术

本文简要介绍了移动IPv6的基本概念和工作机制，在此基础上详细地介绍了移动IPv6中的关键技术。最后介绍了移动IPv6的一些应用。     

基于人口迁移的ABC支持型切换决策机制

提出一种总最佳连接ABC (always best connected)支持型切换决策机制.综合考虑接入网络状况、应用需求、用户对接入网络编码制式偏好、用户对接入网络供应商偏好、终端当前运动速率和终端当前剩余电量等因素,通过博弈分析,基于人口迁移算法,寻找使用户和网络提供方效用达到或接近Nash均衡下Pareto最优的切换决策方案.仿真研究表明,该机制是有效的.     

A solution for transparent mobility with route optimization in the IP multimedia subsystem

This paper presents TRIM+, an architecture for transparent mobility management with route optimization in IMS based networks. The design of our architecture is based on a previous work referred to as TRIM. TRIM was originally devised to provide transparent mobility support in the IMS, although transparency came at the cost of using a suboptimal data path between communicating end points. TRIM+ maintains transparency as a design criterium, and thus end-user applications, running at the mobile node and its correspondent communication peers, are unaware of mobility management procedures. Additionally, the proposed design defines a set of route optimization procedures, allowing compliant devices to use the optimal data path for media communications. Furthermore, TRIM+ addresses packet loss management in scenarios where the media path cannot be maintained during the handover of the MN. To this end, our architecture enables the MN to request buffering capacity in its home network to temporarily store incoming media traffic during the handover, which would otherwise be dropped. This mechanism, as well as route optimization procedures, are executed transparently to the end-user applications running at the communicating end points. As a proof-of-concept, we have implemented a software prototype of the TRIM+ architecture, deploying it over a real IMS testbed. By means of a set of experiments, we have validated the mechanisms proposed in this paper, considering both UDP and TCP user traffic.     

Uncertainty in cellular fuzzy handover

The rapid growth of mobile subscribers throughout the world has generated an unexpected demand for nomadic services. In order to answer such demands an increase in spectral efficiency must be reached. Considering current trends in reducing cell size in order to achieve a higher spectral efficiency which on the other hand causes an increase in the number of handovers executed by the system, it is of major importance to improve the success rate of the current handover algorithms, because an excessive number of handovers adversely impact the signaling load as well as subscriber annoyance. Therefore, effort needs to be devoted to finding optimum handoff strategies. In this paper, the impact of the novel fuzzy reasoning handoff strategy is assessed. The results obtained from the proposed fuzzy model are compared with those from a classical model with a hysteresis strategy using proposed entropy criteria.     

浅析LEO卫星网络中的QoS路由问题

LEO卫星网络能够提供全球覆盖,为任何地点的用户提供适时应用服务。然而由于LEO的高速运动,LEO卫星网络的网络拓扑一直处于动态变化的过程中。文中首先分析了在这种动态变化的网络环境中QoS路由面临的新问题,接着提出了解决这些问题的几点考虑。     

LTE和LTE-A系统切换及数据重传过程研究

详细分析了LTE所规范的切换过程,对存在的问题进行了分析,并为LTE及LTE-A设计了平衡资源利用率和可靠性2方面因素的切换和数据重传机制。     

超密集分簇网络中基于预测门限滞后余量可调的切换算法

在第五代移动通信(5G)系统中,大规模MIMO天线和超密集部署网络是实现高吞吐量的两种方式。针对超密集网络的切换管理的问题,该文基于网络分簇的思想提出了根据终端设备运动情况动态调节滞后余量的切换管理算法。在该算法中,基于小基站分簇化管理的前提,用户设备在小区间切换分为预切换和正式切换两个阶段,预切换阶段完成最佳目标小区选择、小区资源预留和预鉴权等操作,正式切换阶段根据预切换阶段监测的设备速度动态调节切换门限的滞后余量。仿真结果表明了该算法可以有效降低设备的切换时延和切换失败率。     

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。     

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。