BLUEPAC IP:通向新移动之路

针对传统IP协议的不足，提出了BLUEPAC区域概念和BLUEPAC IP概念协议。BLUEPAC IP（Bluetooth Public Access IP）意为蓝牙公众接入网络协议，它以IP为基础，融合移动IP和蜂窝IP之长，支持IP地址分配、路径选择和网间切换。     

ITU-T SG13研究组1999年9月会议IP标准新动态

ITt-TSC131999年9月会议讨论了IP有关问题,主要技术进展有：今后与IP相关的研究重点,涉及16个研究内容及移动IP的研究;IP接入网,以新建议Y．IPan为目标,给出了IP接入网的定义和参考模型;IP与现有网的互通,即IP网络的用户与现有电信网中使用IP业务的用户间的互通;IP的传送门（IPoverATM）;IP业务;支持IP网上业务的信令。     

业界要闻

国内要闻中国建成国家IP核库,服务IC/SoC设计及制造商中国国家软件与集成电路公共服务平台(C SIP)日前宣布,由CSIP筹建的国家IP核库已经建成,并开始正式向IC/SoC设计商、制造商提供服务,国家IP核库将在IP供应商和IP用户之间发挥桥梁和纽带的作用。国家IP核库以丰富的IP核资源为依托,目前可为用户提供IP检索、IP设计资料下载等免费服务。在适当的时候还将提供IP价格咨询服务,并建立IP验证平台,为IP用户提供购买前的IP功能验证服务。CSIP通过建立以上适应中国国情的IP交易体系,可为IP厂商解决各种实际问题,从而促进IP商…     

IP卡电话机的选购

随着通信技术和计算机技术的不断发展,早期使用IP电话卡拨打电话时头痛的通话质量问题,现已不复存在。加之各大运营商开通IP电话业务的城市逐渐遍及全国各地,IP电话卡越来越多地走进千家万户。但使用IP卡拨打电话浪费时间,IP卡电话机就是在这种情况下应运而生的。IP卡电话机,确切地说是具备IP卡拨号功能的电话机,并不是真正意义上的IP网络电话机。目前市面上出现了品种繁多的IP电话机,“IP王电话”、“智能IP电话”、“IP网     

集成电路IP技术标准

IP复用是SOCC设计的关键技术。为解决IP在SOC上的易集成性等问题，需要建立统一的标准和规范，因此，IP复用的基础是IP的标准化设计。文章介绍了国际上IP联盟/组织及IP标准的制定情况，研究了VSIA发布的IP标准和规范；从IP的可复用接口设计、IP可交付使用文档、IP保护三个方面集中介绍了VSIA制定的标准和规范。     

系统芯片设计中的可复用IP技术

可复用IP技术是系统芯片(SOC)设计业的关键技术之一,IP复用能够提高SOC的设计效率,缩短生产周期.鉴于此,论述了IP的基本概念与分类、IP模块的设计和基于IP复用技术的SOC设计过程,并讨论了IP设计与应用中的一些要点,如IP模块的接口、IP的产权保护和IP的选用等.     

面向未来基站IP化的无线回传方案

移动网IP化包括核心网IP化和接入网IP化。 核心网CN的IP化,PS域直接定义在IP上,GPRS的Gn和Gi接口直接通过IP网络承载;对于CS域,由于原有GSM核心网是层次化结构,一般分为汇接局和端局,因此其IP化的进程包括汇接局的IP化和端局IP化。随着端局IP化的全面完成,汇接局也将退出历史舞台,核心网将实现端局到端局直接IP互通。     

WSON关键技术和解决方案

纵观IP与光网络的发展与融合过程,IP over WDM光链路解决了IP业务对带宽的渴求。目前,3G、NGN、IPTV均可通过基于IP的路由型多业务平台实现综合承载。电信网络IP化的趋势越来越明显。此时的IP网络与几年前IP网络扮演的角色、承担的责任已大不相同。随着信息业务IP化、电信业务承载IP化,IP网络不但要承载日益增加的Internet上网业务,     

IP协议及IP路由

1 前言 目前,广电系统的宽带网络建设正在如火如荼地进行着,IP Over WDM、IP Over DWDM、IP Over Optical、IP Over SDH等技术不时出现在各种技术资料中,到底IP是什么意思,这种技术的任务主要是什么?怎样才能将IP技术和IP网络应用得更广泛,有些人并不是很清楚,下面就IP协议和IP路由的技术简要介绍一下。     

IP光网络设计

系统介绍了 IP组网技术 ,一般地 ,IP光网络设计包括 IP光传送层设计和 IP业务层设计。重点介绍了 IP/ Ethernet over SDH技术、IP over re- configurable WDM技术和 p- cycle恢复技术     

Investigations on combined XPM and FWM effects on optical pulse propagation in dynamic IP traffic over WDM networks

The influence of IP bursty traffic on combined nonlinear effects of XPM (cross phase modulation) and FWM (four-wave mixing) in IP over WDM networks are investigated and calculated by solving the nonlinear Schrodinger equation (NLSE) using a novel method under two conditions: on–off Poisson distributed IP traffic and self-similar traffic. Different eye diagrams are obtained under various IP traffic types and input optical powers. When the input power of a single channel is larger than 3 dBm, the effect of IP bursty traffic will deteriorate eye diagrams dramatically in a 40-channel WDM network. We also calculate the FWM powers and interchannel power distribution under different IP traffic loads. Based on the interchannel power distribution, we could find out which channels affect the probe channel seriously by the FWM effect. All these numerical results are useful for the Quality-of-Service (QoS) design, traffic grooming, lightpath routing, and wavelength assignment of IP over WDM networks.     

利用IP欺骗进行网络攻击的原理及预防

IP欺骗是适用于TCP/IP环境的一种复杂的技术攻击,是网络中黑客攻击时采用的一种重要手段。本文阐述了目前在Internet领域中IP欺骗的实现方法和预防措施。     

图像融合IP软核设计与实现

设计并实现了一种针对多聚焦图像融合算法的图像融合IP软核。在ISE环境下实现了图像融合IP软核的Verilog语言描述,之后进行了测试与评估。将融合结果与Matlab处理结果进行对比,验证了文中设计IP软核的准确性。该图像融合IP软核设计方法为其他图像融合算法的IP软核设计建立了基础。     

基于C/S模型的视频信息传输系统研究

讨论了IP网络与C／S模型，并对多媒体网络的传输协议作了分析，借助RTP／RTCP协议来确保视频信息传输的质量，采用C／S模型，在Windows2000环境下，设计了一个支持IP组播的视频信息传输系统，用它能够实现IP网络上的实时视频信息传输。     

The interface between IP and WDM and its effect on the cost of survivability

A summary of research on survivable IP networks overlaid over WDM networks is presented. The WDM networks are part of optical transport service providers, who lease lightpath services to institutions with IP networks. The lightpath services realize IP links for IP networks, and they have different protection grades such as unprotected and protected. The research included considering new network survivability requirements and incorporating them into network design problems. The cost of survivable IP over WDM networks is compared over three scenarios. Each succeeding scenario has the WDM network provide more flexible services, and the IP and WDM networks become more integrated. We consider the problem of setting up lightpaths for an IP network so that the network will remain connected after a fiber link fault. Algorithms to find the lightpaths and minimize cost are given. The network costs under the three scenarios are compared by simulations.     

IMS应用层连续性研究

应用层移动性对在移动环境下的IP应用很重要,底层的移动性支持保证了切换中数据传输的平滑性,而应用层移动性要保证上层应用在移动中正确收发数据。文中提出了移动扩展SOCKET,即MESOCK(Mobile Extension SOCKET)来实现应用层的移动性。它允许应用数据传送中变换数据传输的源和目的IP地址,使得数据可以直接经路由到达目的地而不是采用隧道的方式。能够很好地配合底层的IP地址切换,即终端地址一旦变化,应用层即启用新的IP地址来收发数据,而不是通过数据隧道发送数据。并在地址切换过程中很好地保持连接的持续性,从而保证服务的连续性和数据传输的完整性。仿真结果证明MESOCK可以很好地实现这一目标。     

Performance of hybrid ARQ for IP packet transmission on fadingchannel

This paper proposes and analyzes the performance of a hybrid selective repeat (SR)/multicopy (MC) automatic repeat request (ARQ) scheme to transmit fragmented Internet protocol (IP) packets. The ARQ scheme works in the SR mode until the last IP packet fragment is transmitted. If a fragment is negatively acknowledged after the last fragment is transmitted, then the system goes in the MC mode. In the MC mode, multiple copies of the erroneous fragment are transmitted. After all IP fragments are received without error, the system goes back to the SR mode. The performance of the proposed scheme is evaluated in terms of the bit error rate (BER), IP packet size, and fragmentation size with and without Bose Chaudhuri Hocquenghem (BCH) error correction codes. Both the results are obtained under additive white Gaussian noise (AWGN) as well as flat Rayleigh fading channels. The proposed scheme gives a throughput of 0.9, even at high BER conditions, for any IP packet size under an AWGN channel while, an 8-dB improvement is achieved, when using BCH(63, 51, 2) for throughput of 0.9, over selective repeat+stutter scheme 2 (SR+ST 2) under a flat Rayleigh fading channel     

Experiments and enhancements for IP and ATM integration: the IthACIproject

IthACI has been a European project in the ACTS framework concentrating on fast layer 2 forwarding methods for IP traffic based on labeled flow mechanisms. The approach is also known as IP switching and is considered promising for enhancing IP performance. Several flavors of IP switching have been proposed by various vendors (e.g., IP switching by Ipsilon, Tag Switching by Cisco, ARIS by IBM, IPSOFACTO by the NEC), all of them different and not interoperable. IP switching has been adopted by the IETF under the umbrella of multiprotocol label switching (MPLS). Although MPLS has made remarkable progress, a number of issues remain largely open for further investigation. The scope of the IthACI project was to address such issues and propose solutions. The issues addressed were multicast, QoS, resource management, and mobility support in a multicast environment. IthACI conducted both theoretical and experimental work. Three network islands, each based on a different flavor of IP switching, were set-up and the interoperability of these different IP switching/MPLS flavors were investigated and demonstrated     

0.18μm BCD工艺平台LogicEE IP的数据保持力

研究表明,0.18μm BCD工艺中SAB膜的厚度对Logic EE IP的数据保持力特性有重大影响。SAB膜越厚,Logic EE IP的数据保持力特性越好;如果SAB膜厚度小于一定尺寸,那么Logic EE IP的数据保持力将会失效。因此适当的SAB膜厚度对保证Logic EE IP的数据保持力通过合格性测试非常重要。主要研究在标准工艺条件下,通过3种SAB膜厚(标准厚度55 nm、80 nm和100 nm)、老衬底(标准厚度55 nm)、新衬底延长清洗时间(标准厚度55 nm)以及新衬底新生长材料的SAB膜(标准厚度55 nm)等试验,最终确定了在华虹宏力0.18μm BCD工艺平台上,当SAB膜厚度为100 nm时,Logic EE IP核的数据保持力通过了JEDEC标准的合格性测试。     

基于IP集成的功能增强型MCU设计

文章采用基于IP集成的方法设计了功能增强型的MCU,讨论了基于IP集成设计方法的几个关键问题,并给出了具体的设计实例。文章讲述的方法对于SOC系统的构建有一定的启发意义。此外,文章还涉及了在集成环境中通过门控时钟实现低功耗的设计方法。