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基于IP的Gb接口技术及实现 总被引:1,自引:0,他引:1
1 引言 EGPRs和WCDMA/HSPA等网络业务的开通,提高了无线接入网络的带宽,促进了数据业务的发展,而目前基于帧中继传输的Gb接口成为数据业务开展的瓶颈. 相似文献
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1、概述
高速下行分组接入HSDPA(Hish Speed Downlink Package Access)是第三代移动通信中非常重要的增强技术,特别适用于多媒体、远程会议、Interact等大量下载信息的业务。HSDPA是在R5协议中为了满足上/下行数据业务不对称的需求而提出的,它可以在不改变已经建设的WCDMA网络结构的情况下,把下行数据业务速率提高到10Mb/S。该技术是WCDMA网络建设后期提高下行容量和数据业务速率的一种重要技术。 相似文献
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以太网自相似流量的建模及实现 总被引:3,自引:0,他引:3
刘 《信息安全与通信保密》2007,(2):81-82
EOS(Ethernet over SDH)设备的测试中,合理的业务源模型能很好地模拟现实的网络状况,传统泊松过程、指数分布等的模型不能准确描述现实业务流的突发性。因而,论文提出了一种以太接入数据业务的自相似性的业务流量模型,介绍了它的建立和实现方法,并在实际测试中得到应用。 相似文献
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3G传送网解决方案探讨 总被引:2,自引:0,他引:2
3G技术是当今无线通信乃至整个通信界的重要发展方向。随着数据业务的飞速发展,数据接入的可移动性要求不断凸现。结合现有网络基础,基于WCDMA系统分析了3G移动网络节点之间的业务传送问题,提出并分析了在保证3G业务传送质量的同时提高带宽利用率以降低传送带宽需求的高效低成本传送网解决方案。 相似文献
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分组数据业务和话音业务对资源的需求具有截然不同的特点:分组数据业务可以容忍时延及时延抖动,对差错敏感,前向需求与反向需求不对称,QoS等级多,追求的目标是系统的吞吐量最大化;而话音业务相对连续,对时延和时延抖动敏感,能容忍一定的差错,前反向需求对称,QoS等级相对单一。因此,各种3G标准都对分组接入业务提出了特有的解决方案,以提高分组数据业务的传输能力和性能。其中WCDMA系统和TD-SCDMA系统采用高速下行分组接入(HSDPA)技术,而cdma20001x系统则提出分阶段的1x EV-DO和1x EV-DV实现技术。1HSDPA技术特点及性能HSDPA… 相似文献
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随机接入过程WCDMA网络通信的初始阶段,UE终端快速、可靠的接入网络,是优质WCDMA网络的重要体现。本文深入研究随机接入原理,结合室分系统组成,分析室分系统干放对随机接入过程的影响。基于理论分析,我们提出参数优化方案。通过测试分析,从多方面对参数优化值进行验证,说明室分系统中,针对性进行随机接入参数优化的必要性。 相似文献
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结合3GPP协议的性能要求,根据理论分析和计算机仿真,提出了WCDMA随机接入信道前缀码捕获的一种实现方法。 相似文献
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Dong In Kim Hossain E. Bhargava V.K. 《Wireless Communications, IEEE Transactions on》2003,2(5):911-925
We propose a measurement-based dynamic random access (RA) code assignment procedure for prioritized packet data transmission in wideband code-division multiple access (WCDMA) networks. This dynamic adaptation process is based on analytical performance results derived for random packet access under Rayleigh fading in WCDMA networks. The performance of the proposed measurement-based RA code assignment procedure with three different adaptation methods is evaluated by using computer simulations. The performance of the proposed scheme is compared with those of a retransmission control-based and static channel allocation-based prioritized packet access scheme. An integrated (physical layer and link layer) delay-throughput performance model is presented for finite population RA WCDMA systems. The proposed dynamic RA code assignment procedure can be used in an adaptive quality of service (QoS) framework for dynamically adjusting the QoS of prioritized RA data traffic in the evolving WCDMA-based differentiated services wireless Internet protocol networks. 相似文献
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Traffic Modeling in WCDMA System Level Simulations 总被引:4,自引:0,他引:4
1 IntroductionThegradeofservicethatwirelesssubscriberswouldexperienceisdependentonthequalityoftheradionetwork planning .Therefore ,systemlevelsimulationisneededfornetworkplanning ,inwhichtrafficmodelsareemployedintwofundamentalways:eitheraspartofananalyt… 相似文献
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The traffic performance of integrated 3G wide-band code division multiple access (WCDMA) and GSM/GPRS network is evaluated.
This type of network links two cellular radio systems which have different set of frequency bands and the same coverage size.
The base station of 3G WCDMA is installed on an existing GSM/GPRS site. Dual-mode mobile terminals use handoff to establish
calls on the better system. The soft handoff or inter-frequency hard handoff occurs when mobile terminals of 3G WCDMA or GSM/GPRS
move between two adjacent cells, respectively. The inter-system hard handoffs are used between 3G WCDMA and GSM/GPRS systems.
The data rate conversions between different systems, soft handoff region size, multiple data rate multimedia services, and
the effect of the mobile terminal mobility on the user mean dwell time in each system are considered in the study. The simulation
results demonstrate that a great traffic performance improvement on the complementary use of 3G WCDMA and GSM/GPRS cellular
radio networks compared with the use of GSM/GPRS cellular radio networks. When high-data rate transmission is chosen for low-mobility
subscribers, both the handoff failure probability, and carried traffic rates increase with the new call generation rate. However,
both rates decrease conversely with the increasing new call generation rate as soon as the new call generation rate exceeds
a critical value. This causes the integrated networks saturation. The higher mean speed for the mobile terminals produces
lower new call blocking probabilities and total carried traffic. The new call blocking probabilities and total carried traffic
increase with the size of the soft handoff region. 相似文献
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