5G信令网SCP引入策略及部署建议分析

信令网是移动通信的神经网络,随着5G网络部署网元规模的增加,现有网元通信模式出现局限性。通过分析SCP引入必要性及组网模式,结合现网特点从业务需求、与周边网元对接、运维管理、网络演进等因素,给出初期组网模式、节点设置和网络架构建议。     

5G核心网网络健壮性增强方案研究

网络故障容易引起信令风暴，进而对网络的稳定运行造成冲击。通过增强5GC网元功能可降低网络故障的影响、减少信令风暴的产生，提升网络健壮性。重点研究了AMF主备网元用户动态数据热备和5GC免UDM惯性运行增强功能，并基于实验室环境进行了测试验证。初步验证了该功能的有效性和可行性，为进一步开展现网测试验证提供了参考依据。     

ROADM网络的开通和测试

1引言 与任何其他网络一样,ROADM网络测试要求涵盖光纤、光性能和最终传输服务3个方面.网元(NE)如此,完整的端到端网络也不例外. 2.节点开通期间ROADM网元的测试 一旦ROADM网元全部连接好且准备投入运行,就必须进行功能测试.第一步是检查光特性.     

统一Centrex业务平台与现网SCP融合方案

本文首先提出了统一Centrex业务平台的部署方案,分析了现网各厂家SCP设备升级改造成统—Centrex业务平台的可能性及相关改造方案.最后提出了统一Centrex业务平台与现网SCP融合步骤.     

中国电信:完善智能网确保业务创新

中国电信的智能网采用叠加网的方式,SSP与DC1交换机合设,DC2的一些交换机也具备SSP功能。SCP根据业务开放的范围不同分为骨干网的SCP和省网的SCP。在南、北拆分之后,现在的中国电信又重新拥有了完整的智能网体系架构。目前,中国电信的智能网已经开展了种类繁多、各具特色的智能     

利用SDH实现高精度时间同步

首先分析了同步数字体系(SDH)网络的时频特性,然后提出了一种利用SDH实现高精度时间同步的方法。经实验验证,经过300 km,5个SDH网元传递后时间同步偏差平均值1.4 ns,最大值不超过11 ns。文章分析了技术实现的关键问题,并给出解决方案,然后通过测试及分析,验证了此方案的可行性和性能。     

移动智能网中SCP的性能测试

移动智能网建设中,需要对SCP系统的性能进行测试,以保证最终的系统能够符合设计要求.在SCP性能测试中,压力测试和故障切换测试是两个主要方面,本文从测试需求、测试原理、测试方法等方面对这两类测试分别进行了简要的介绍.     

电信CDMA网语音时延分析和改善措施研究

主要研究CDMA系统语音时延对用户感知的影响。首先,对CDMA网典型场景下的语音时延进行测试,并把测试结果与GSM,TD-SCDMA,WCDMA和固话等几种系统的语音时延进行比较。其次,重点分析CDMA虚拟网业务时延产生原因,提出2种改善措施:改造C网MSCe与固网SS之间SIP路由直接互通方式和改造SCP及软交换平台以开通IVPN主叫短号一次触发功能。最后,对上述2种改进后的方案进行测试,测试结果反映接续时长和语音时延都得到了较大的改善。     

中兴IM-SSF与MSG9000组网安全分析

IMS可以通过IM-SSF网元代理触发SCP的智能业务来继承现网PSTN的智能业务。目前,在中国电信IMS工程中,中兴公司采用IMS-SSF与MSG9000为口字型组网与SCP互通,该组网存在信令转发和放音收号单点故障风险。为了解决网络安全性,讨论了4个解决方案,最终中兴公司采用IM-SSF与MSG9000交叉组网方式来满足容灾要求。     

航空机载设备中可编程逻辑器件的第三方测评方法研究

目前航空机载设备中可编程逻辑器件的应用领域和规模逐步扩大,在设备软件测评过程中软件测试人员面临着是否需要对FPGA/CPLD进行测试、如何测试的困惑。针对该疑问,本文对传统的软件测试方法和可编程逻辑器件验证方法进行分析,并借鉴军用产品软件第三方测评进入条件评估的思路,提出了能够较好地适应高安全性设备软件第三方测评的流程和方法,提高可编程逻辑器件测评的效率。     

In-line monitoring of 300 mm silicon epitaxial and CZ wafers using surface charge profiler

The surface charge profiler (SCP) offering non-contact electrical characterization of the near-surface region of silicon wafers is discussed. The system permits fully automatic handling of 300- and 200-mm wafers. The SCP method, based on a low intensity illumination a.c. surface photo-voltage principle, does not require any surface preparation. It allows for a fast (600 points/min), high-resolution mapping of the active doping concentration in the near-surface region as well as surface recombination lifetime. The capabilities of the SCP method for process monitoring and development are illustrated with 200- and 300-mm wafers, focusing on the effects of epi growth conditions on the layer uniformity and its resistivity.     

A novel robust and low cost chips package and its thermalperformance

In an attempt to provide a high density memory solution, especially for workstation and PC servers, a stack chips package (SCP) has been developed. The major characteristics of SCP are as follows: (1) SCP contains a plurality of both memory chips and lead frames within a molded plastic package; (2) chip selection is made through the wire bonding option, resulting in the package with a memory capacity twice or four times that of monolithic chip; (3) plural lead frames are electrically interconnected all at once, using metal solders electroplated on the lead frame surface; and (4) SCP is found reliable and cost competitive when compared to other stack packages because it basically adopts the molded plastic packaging technology as well as the metal solder interconnection method. As electrical interconnection methods, both a fluxless soldering joint of Ag/Sn and a high-pressure mechanical joint of Ag were evaluated extensively and they successfully provided a reliable electrical conduction path without any signal degradation. Temperature cycle test and pressure cooker test were proved not to produce any micro cracks across the joint. The thermal performance of SCP was simulated by a thermal model based on finite element method (FEM) and also experimentally verified, showing good agreement within 10% deviation from simulated value. 128M SCP showed better thermal performance than stacked two TSOP's because one chip could serve as a heat sink while the other chip is activated and thermal conduction path through the lead frame is short     

An EEG-driven brain-computer interface combined with functional magnetic resonance imaging (fMRI)

Self-regulation of slow cortical potentials (SCPs) has been successfully used to prevent epileptic seizures as well as to communicate with completely paralyzed patients. The thought translation device (TTD) is a brain-computer interface (BCI) that was developed for training and application of SCP self-regulation. To investigate the neurophysiological mechanisms of SCP regulation the TTD was combined with functional magnetic resonance imaging (fMRI). The technical aspects and pitfalls of combined fMRI data acquisition and EEG neurofeedback are discussed. First data of SCP feedback during fMRI are presented.     

Ensuring robust call throughput and fairness for SCP overloadcontrols

The paper analyzes the performance of two different types of service control point (SCP) overload control algorithms, table-driven controls and an adaptive control. As performance measures, the author uses aggregate transaction throughput and fairness (whether the control algorithm allocates SCP capacity to individual traffic sources as desired). It is found that, even when parameters are well-matched to source characteristics, table-driven controls do not perform as well as the adaptive control. In addition, the adaptive control is more robust to traffic patterns and SCP internal operation than the table-driven controls     

智能网业务控制点容灾备份的组网方案研究

本文所提出的业务控制点容灾备份的组网方案可以实现通过采用虚拟全局码(GT),将多套业务控制点(SCP)组成一个负荷分担的集群组,集群里负荷分担的业务控制点分布在不同的机房,负荷分担处理触发上来的呼叫,其中任何一个业务控制点或任何一个机房的设备故障时,业务自动切换到集群组里的其它业务控制点,由其它的业务控制点共同负荷分担处理业务,不影响业务。从而在不闲置设备、不增加系统复杂度的情况下,有效解决业务控制点的容灾问题。     

空调温控电子膨胀阀驱动电路的设计

介绍了一种利用单片机驱动电子膨胀阀电路的设计方案.单片机对传感器测得的温度和其他信号进行处理,驱动步进电机开闭电子膨胀阀,并通过RS485将信息传给上位机.给出驱动电路的软硬件实现方案,该电路已成功地应用于某空调制冷电子膨胀阀测试系统.     

智能网系统SCP的实现技术

介绍了智能网系统的物理体系结构和业务控制点的逻辑结构，高级智能网系统的ＳＣＰ的各个模块的主要功能，ＳＣＰ与其他物理实体以及ＳＣＰ各逻辑之间通信和ＳＣＰ与业务逻辑处理程序实例的通信方法。     

An Extended Service Filtering Technique for Mass Calling-Type Services Using Intelligent Peripheral in an SCP-Bound Network

This paper proposes an extended service filtering technique to prevent overload in service control point (SCP) due to televoting (VOT) or mass calling (MAS) services with the heavy traffic characteristics. Also, this paper compares this extended technique with the existing overload control techniques, and calculates steady state call blocking probabilities in intelligent network (IN) under overload conditions. The proposed technique considers SCP overload and IN Capability Set (CS)-1 services (such as VOT or MAS service) that have to use the specialized resources of intelligent peripheral (IP). This technique uses first an activating step in which SCP requests service filtering to service switching point (SSP). Then, in the filtering step, SSP sends filtering results to SCP periodically or each Ncalls. Also, when filtering time-out expires, SSP stops service filtering, and sends service filtering response to SCP in the deactivating step. This paper applies this technique to VOT/MAS service, and calculates SCP and SSP-IP (circuit) call blocking probabilities by using an analytical VOT/MAS service model. With the modeling and analyzing of this new technique, it shows that this technique reduces the traffic flow into SCP from SSP and IP prominently.     

无线传感器网络中分簇安全路由协议保密通信方法的能效研究

保密通信方法研究的是如何保证路由信息在传输的过程中的安全性,是无线传感器网络中的核心技术之一。针对现阶段大多无线传感器网络路由协议都存在路由安全性问题,该文从均衡能耗的角度出发,引入保密通信协议(SCP)保密通信方法,提出一种能耗均衡的保密通信协议,并对该协议的安全方案进行了分析。然后对协议的性能进行了仿真,结果证明了该协议在能耗和安全性上的性能和利用价值。