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IMS网络的引入为电信运营商带来新机会,多媒体业务的丰富可为IMS用户带来新的业务体验,但是,在引入IMS网络后,业务网络将基于IMS核心网络进行融合,现有的固定网络和移动网络上的语音增值业务将大大丰富IMS用户和融合业务用户的业务体验,同时提升不同网络接入用户语音业务体验一致性。文中针对中国电信IMS网语音增值业务融合发展需求,结合广东电信典型业务创新性地提出IMS网络初期阶段语音增值业务融合发展思路,包括三种业务融合实现方式,分析其优缺点并提供应用建议,为建设初期基于IMS的业务融合提供参考。 相似文献
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VoLTE(基于IP多媒体子系统的语音业务)技术的应用是LTE发展的主要趋势之一,是LTE网络的最终语音解决方案。VoLTE的部署对于促进LTE网络演进具有重要作用,何时部署VoLTE以及如何部署Vo LTE对于运营商的业务发展具有重要意义。文章介绍VoLTE业务及产业链发展情况,对CSFB(电路域回落)、SVLTE(LTE与语音网同步)、OTT(Over the Top)等几种VoLTE部署前的语音过渡方案进行分析,指出运营商的网络现状及部署VoLTE面临的主要问题,对比几种过渡方案的特点,探讨运营商部署VoLTE的策略。 相似文献
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在分析语音业务发展趋势的基础上,提出了目前电信运营商核心网络发展与演进的趋势、策略与发展步骤,阐述了现网核心网向IMS架构演进的各阶段目标结构与重点建设方案。 相似文献
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当前我国已经正式迈进了4G时代的大门,语音和视频通信也朝着更加高清的方向发展,而VoLTE在此发挥了至关重要的作用.VoLTE是一种网络架构,通过将IMS网络语音业务融入其中,使得自身可以同时支持多种多媒体业务.而本文则以此为背景,分别从集中建设和分省建设两种部署方式出发,着重围绕IMS网络在VoLTE阶段的发展与部署进行简要研究. 相似文献
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随着终端、基站、EPC、IMS网元的大量端到端性能及配合问题解决,VoLTE业务在接通率、掉话率指标均已经基本达到了CDMA网络的水平,接入性能和保持性能方面的感知得到了较大改善。VoLTE作为LTE网络实现语音通话的最终方案,其通话质量、用户感知成为主要关注方向。本文主要介绍了衡水电信网优团队针对VoLTE语音通话在无线层问题导致的丢弃包、时延问题进行分析、定位的基本思路、优化方法。希望能够为网优工程师在VoLTE优化工作中提供帮助和支撑。 相似文献
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随着IMS(IP多媒体子系统)网络大规模的建设,IMS网络的组网、技术和业务提供能力等成为运营商关注的焦点.彩铃业务作为电信运营商的一项增值业务,不仅为固网、C网用户提供,同时也为IMS用户提供.对IMS用户彩铃和现网用户彩铃业务的融合进行了探讨,提出了五种不同解决方案. 相似文献
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VoLTE(Voice over LTE),即在LTE网络下承载语音业务。VoLTE是一个宽泛的概念,从运营商的角度来看,VoLTE包括SV-LTE、CSFB、IMS和SRVCC共4种方案。这些方案实现方式各不相同,在LTE演进的不同阶段,它们都将发挥各自重要的作用。罗德与施瓦茨(中国)科技有限公司刘轶旻所撰《VoLTE测试与CMW500射频测试仪》一文将就几种VoLTE(SV-LTE、CSFB、IMS和SRVCC)方案的基本原理以及罗德与施瓦茨(中国)科技有限公司的CMW500射频测试仪对VoLTE(SV-LTE、CSFB、IMS和SRVCC方案)的测试能力进行介绍。 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system. 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
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. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's. 相似文献
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It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory. 相似文献
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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. 相似文献
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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. 相似文献
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《中国通信》2014,(7)
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 相似文献