VoLTE应用价值与网络优化方向

本文根据移动通信用户及运营商对于VoLTE（移动语音技术）应用价值的需要,做好VoLTE网络优化方向的研究工作。根据各类语音业务解决方案的特点和优势,选择VoLTE的发展方向。同时做好eSRVCC的切换成功率、呼叫建立时延、切换时延、MOS值等指标优化研究工作,积极地促进VoLTE服务业务开展。     

CDMA EVDO反向软切换成功率优化探讨

CDMA EVDO系统中反向软切换成功率是EVDO移动性能中的一项重要指标,影响了EVDO系统的吞吐量,同时也影响了用户的感知度。文章系统性地介绍了CDMA EVDO系统中软切换成功率指标定义、软切换信令流程指标统计点,重点介绍了影响CDMA EVDO系统中软切换成功率的主要因素,以及相应的解决办法,通过具体案例详细介绍软切换成功率问题分析及定位的思路方法。     

LTE与EV-DO互操作性能研究

分析了LTE与EV-DO数据业务互操作方案,非优化切换方案、流程和相关参数,并对非优化切换时延、切换成功率进行实测分析,与脱网重选时延进行对比,提出LTE数据业务互操作方案实施策略与建议,提升用户业务体验.     

基于速度触发的提前切换算法在LTE-R中的应用研究

随着高铁的快速发展,铁路移动通信系统对切换时延、切换成功率等要求更为苛刻。该文针对铁路长期演进(LTE-R)系统提出基于速度触发的提前切换算法,通过提前进行信令交互、设置切换预承载点切换的方式抑制过早或过迟切换所带来的通信中断、掉话等问题。通过信令流程图进行理论分析,并对长期演进(LTE)各结构类型数据计算可知,该算法均可缩短切换时延,其中TDD帧结构类型2时效果最为显著。最后通过仿真对比得到提前切换算法相比传统切换算法有着更高且更稳定的切换成功率,验证算法的有效性,为LTE-R在未来铁路专网的应用提供技术支持。     

移动卫星网络中基于最小费用的切换算法

对于移动卫星网络,合理的星地链路切换方案需要在保证最小切换时延的同时,能够最优地使用网络资源。该文通过引入业务的中断概率和费用模型,给出了切换过程中重路由的最优触发条件,提出一种基于最小费用的切换(SMCH)算法。该算法可在保证切换业务通信的连续性和时延等指标不被破坏的基础上,通过适当的触发重路由来降低切换费用。仿真表明该算法在保证切换业务的QoS,降低切换费用以及适应性、灵活性等方面都优于同类切换算法。     

一种适合于第四代公网集群系统的切换算法

提出了一种适合于公网集群系统的小区切换算法.在公网集群系统中,多个群组用户同时进行越区切换,可能造成信令风暴,导致更高的切换时延,降低了小区切换成功率.通过引入桥梁群组用户这一概念,通过桥梁群组用户同时连接2个网络,利用2次垂直切换代替一次水平切换的方法,避免了大量群组用户同时发起切换测量.仿真结果表明,利用移动自组织网络为准备切换的集群用户组成一个小网络,桥梁群组用户带领其他群组用户切换的方法比传统切换算法的切换成功率高,切换时延更短.     

GSM切换掉话的分析及解决方法

所谓切换,就是指当移动台在通话过程中从一个基站覆盖区移动到另一个基站覆盖区,或由于外界干扰而造成通话质量下降时,必须改变原有的话剖言道而转接到一条新的空闲话音信道上去,以继续保持通话的过程。切换是移动通信系统中一项非常重要的技术,切换失败会导致掉话,影响网络的运行质量。因此,切换成功率(包括切入和切出)是我们网络考核的一项重要指标,如伺提高切换成功率,降低切换掉话率是我们网络优化工作的重点之一。     

新疆移动BSC间切换成功率降征问题分析处理

切换失败会导致用户通话掉话，导致用户对网络连续通话质量感知度下降。切换成功率是移动网的KPI指标，切换成功率在99．5％以上，相当于掉话率指标应低于0．5％。因此对于切换失败原因需要跟踪分析并尽快解决问题；本文提供了遇到切换成功率降低后分析处理过程，并最终解决了问题，提升了移动网络业务质量。     

5G移动性增强关键技术及应用分析

3GPP在Rel-15版本中,NR移动性管理只引入了基本的切换功能,而NR切换0 ms中断时延是为UE提供无缝切换感受的性能需求之一,且在高频移动时UE可能会遇到快速的信号恶化,切换的可靠性也会降低,如何减少切换过程中的数据中断时间以及提高移动鲁棒性是R16一个重要研究方向.针对以上问题,R16移动性增强提出了两个关键...     

基于切换预测的移动IPv6无缝切换方案

分析F-HMIPv6和S-MIP切换方案,提出一种基于节点运动模式预测的、移动辅助网络控制的智能预测无缝切换方案。该方案综合考虑多种因素进行切换信息预测,根据切换预测对切换模式划分,使节点可以自适应进行切换。同时,优化信令交互流程尽可能提前且迅速完成绑定注册。分析表明,该方案增强了切换预测的命中率,提前并加快了绑定注册,降低了切换时延,继而提高了快速预先切换的成功率。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.