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.     

移动IPv6越区切换算法的研究与仿真

分析移动IPv6中的TCP拥塞控制机制和移动检测技术,讨论一个改进的越区切换算法,并采用OPNET网络仿真软件对其进行仿真.仿真结果表明,该算法有效地抑制了由于移动节点的越区切换而导致的拥塞控制机制的启动,增强了移动网络的通信能力.     

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。     

移动IPv6的切换优化方案

移动节点在两个子网之间移动时将产生切换,而基本的移动IPv6切换延迟太大,不能满足实时业务的要求,因此IETF提出了移动IPv6快速切换协议.本文对移动IPv6的切换原理和性能进行了分析,对目前快速移动IPv6和层次移动IPv6切换进行了比较,并提出快速层次移动IPv6的切换方案,减小移动IPv6的切换时延,提高网络性能.     

Assessing the public-private partnership handover: Experience from China's water sector

Most infrastructure public-private partnerships (PPPs) are returned to the government once the contract term expires. Before the handover, a preparatory period, known as the “handover stage (HS),” is needed to determine whether the project is fit for handover. However, to date, no means to assess the performance status of the handover management has been established. This study addresses this practical demand by establishing a definition of handover success and identifying and evaluating criteria for the measurement of handover success, which contributes to a better understanding of HS management.