网络游戏业务在LTE系统中信令时延分析

随着移动通信技术的迅猛发展,LTE作为目前移动通信系统的主要演进方向,越来越多的用户使用其网络业务.本文就以网络游戏业务的随机接入过程中信令优化为叙述重点.首先介绍了网络游戏业务,然后结合网络游戏业务的特点和随机接入的信令流程,找出在随机接入信令中影响网络游戏业务的时延参数,并进行信令参数优化.     

Dimensioning IP access links carrying data traffic

This paper proposes simple dimensioning rules for high speedip access links carrying data traffic. Assuming a finite source population and fair bandwidth sharing among user flows, we derive formulas relating capacity, demand and performance. These formulas allow link dimensioning for a target quality of service expressed in terms of useful per-flow throughput. They constitute a data traffic model equivalent of the Engset model for telephone access networks. Performance is shown to be largely independent of detailed traffic characteristics such as the statistical distributions of flow size and think time. Simple approximations are derived for two distinct performance regimes corresponding to transparency and saturation, respectively. Extensions to the basic model account for a heterogeneous user demand, unfair bandwidth sharing or different access rate classes. In any case, the key parameter for dimensioning is the offered traffic, defined as the average data rate a user would generate in the absence of congestion.     

关于LTE随机接入过程研究

LTE中规定了两种随机接入过程:同步随机接入过程和非同步随机接入过程。在开始非同步过程的随机接入之前,L1需要先从高层获得以下信息:随机接入信道参数(PRACH的配置,频率位置和Preamble格式);以及用于确定根序列的参数、小区的Preamble循环移位的设置(根序列表的索引,循环移位Ncs和集合的类型(普通和高速的设置))。     

LTE mobile network virtualization

Network virtualization is receiving immense attention in the research community all over the world. There is no doubt that it will play a significant role in shaping the way we do networking in the future. There have been different approaches to virtualize different aspects of the network: some are focusing on resource virtualization like node, server and router virtualization; while others are focusing on building a framework to set up virtual networks on the fly based on different virtual resources. Nevertheless, one very important piece of the puzzle is still missing, that is “Wireless Virtualization”. The virtualization of the wireless medium has not yet received the appropriate attention it is entitled to, and there have only been some early attempts in this field. In this paper a general framework for virtualizing the wireless medium is proposed and investigated. This framework focuses on virtualizing mobile communication systems so that multiple operators can share the same physical resources while being able to stay isolated from each other. We mainly focus on the Long Term Evolution (LTE) but the framework can also be generalized to fit any other wireless system. The goal of the paper is to exploit the advantages that can be obtained from virtualizing the LTE system, more specifically virtualizing the air interface (i.e. spectrum sharing). Two different possible gain areas are explored: spectrum multiplexing and multi-user diversity.     

LTE网络优化技术

LTE(Long Term Evolution)网络是继第三代移动通信网络之后国际上的新一代主流移动通信网络.介绍了LTE网络在特定场合采用的各种网络优化技术,包括在室内覆盖的家庭基站技术、在信号盲区和偏远地区覆盖的中继技术、在同频组网情况下抑制小区间干扰的小区间干扰协调技术,以及在小区边缘传输速率受限区域的多点协作技...     

浅析LTE承载网解决方案

文章首先介绍了LTE承载网的三层需求,在此基础上针对数据业务和语音业务给出了LTE承载网解决方案,包括IP与VLAN规划、QoS、保护方案以及同步方案。     

浅谈LTE网络优化技术

随着LTE商用网络的快速部署,LTE网络优化技术变得尤为重要。本文首先探讨了LTE网络优化的具体内容,并且分析了LTE网络优化的流程,最后给出在网络优化过程中,LTE网络优化的实施案例。     

LTE Part I: Core network

Current cellular networks based on Third Generation Partnership Project (3GPP) and 3GPP2 technologies provide evolution from circuit-switched technologies, originally developed for voice communications, to packetswitched technologies. Next-generation networks need to deliver IP-based services (voice, video, multimedia, data, etc.) for all kinds of user terminals while moving between fixed (fiber, DSL, cable) and wireless (3GPP-based, 3GPP2-based, IEEE-based) access technologies, and roaming between various operator networks. Users expect the network to originate, terminate, and maintain a session while the user is moving and roaming. Services have to be delivered to users based on serving network functionality (quality of service [QoS], bandwidth, etc.), availability, and user preferences. The network and users must be protected through various authentication, encryption, and other security mechanisms at the access, network, and application layers. Mobility has to be provided through coordinated link, network, and application layer mobility mechanisms that ensure user expectations of service performance are met. Requirements on the radio technology include improved performance as well as reduced system and device complexity. 3GPP Release 8 specifies the architecture to meet the above requirements.     

基于LTE的话音回落技术应用

本文基于CS Fallback技术的移动性管理流程和话音呼叫流程,分析了在一般场景下及MSC Pool场景下,CSFallback应用所面临的问题以及可能的解决方案.最后给出了在LTE网络部署CS Fallback的建议.     

LTE网络多载波负荷均衡优化

随着移动宽带业务增长,网络扩容不断加速.为保证LTE载波扩容后充分发挥效能、各载频用户分布相对均衡,从而达到负荷分担的目的,需要进行载波间负荷均衡优化.本文文章对负荷均衡的分类、流程、分场景的负荷均衡优化设置以及互操作策略等进行了深入分析.     

LTE核心网与PTN组网方案研究

研究了LTE核心网集中部署时PTN网络的组网方案,在此基础上分析了未来LTE核心网规模扩大局点分裂或下沉后PTN网络可能的组网演变,以期为LTE核心网与PTN承载网的合理组网提供借鉴。     

Dimensioning network links: a new look at equivalent bandwidth

One of the tasks of network management is to dimension the capacity of access and backbone links. Rules of thumb can be used, but they lack rigor and precision, as they fail to reliably predict whether the quality, as agreed on in the service level agreement, is actually provided. To make better predictions, a more sophisticated mathematical setup is needed. The major contribution of this article is that it presents such a setup; in this a pivotal role is played by a simple, yet versatile, formula that gives the minimum amount of capacity needed as a function of the average traffic rate, traffic variance (to be thought of as a measure of ?burstiness?), as well as the required performance level. In order to apply the dimensioning formula, accurate estimates of the average traffic rate and traffic variance are needed. As opposed to the average rate, the traffic variance is rather hard to estimate; this is because measurements on small timescales are needed. We present an easily implementable remedy for this problem, in which the traffic variance is inferred from occupancy statistics of the buffer within the switch or router. To validate the resulting dimensioning procedure, we collected hundreds of traces at multiple (representative) locations, estimated for each of the traces the average traffic rate and (using the approach described above) traffic variance, and inserted these in the dimensioning formula. It turns out that the capacity estimate obtained by the procedure, is usually just a few percent off from the (empirically determined) minimally required value.     

LTE与CDMA2000接入网的互通问题

分析了CDMA2000 HRPD互通架构,描述了它的附加单元和更新逻辑单元,给出了CDMA2000 HKPD互通架构中的接口与协议,讨论了LTE与CDMA2000 1xRTT的互通问题.     

LTE网络优化方法研究与分析

随着移动通信网络进入4G时代,该领域中的关键技术逐渐成为研究的重点,其中,对LTE网络的研究更是成为热门方向。文章简单介绍了LTE网络中的新架构、新技术与新问题,并阐述了对LTE网络进行优化的困难与解决方案。     

LTE中随机接入过程的解析及工程实现

LTE中进行随机接入的功能是实现UE和网络的同步,对于UE只有通过随机接入过程与系统上行同步之后,才能被系统调度进行上行传输。针对随机接入信道在LTE中的实现过程以及随机接入中涉及到的具体参数进行了详细研究,并且通过仿真对ZC序列在RACH中的相关特性进行分析,最后结合实际工程应用给出了在飞思卡尔的8157上的实现方式。     

LTE800MHz网络部署策略分析

在社会快速发展的今天,LTE800MHz网络部署策略的分析十分重要.其不仅能够让网络的覆盖面积得到整体性的提升,还能让网络部署的体系结构得到相应的优化.本文主要针对LTE800MHz网络部署的方法进行分析,并提出了相应的优化措施.     

IPRAN承载网LTE业务的可靠性部署

随着LTE(Long Term Evolution)网络的大规模部署及多业务发展战略的推进,无线宽带化趋势越来越明显,IP化业务的承载需求成为主导。承载网的建设需要满足高质量承载、高可靠性、可维护可管理、低代价演进的LTE承载特性。本文以中国联通承载网IPRAN（IP Radio Access Network）方案为例,阐述下IPRAN承载网LTE业务的可靠性部署。     

郑州市某簇LTE网络的优化研究

随着移动互联网的快速发展,LTE作为第三代合作伙伴计划(3rd Generation Partnership Project,3GPP)长期演进技术目前已取得突破性进展。长期演进(Long Term Evolution,LTE)以其低时延、高速率的特性,于2013年底正式用于商用。作为中原大都市以及主要文化经济交流中心,郑州市目前的LTE网络正处于前期建设和优化部署阶段。根据LTE网络的特性和建设方式,如何做好网络前期规划、快速优化网络性能是建设精品网络的关键,同时也是提高用户体验度和感知度的关键。文章实现了郑州某簇测试区域进行问题点分析,将全市范围内的网络划分为多个不同的区域,并在完成单站优化的基础上,将这些基站组成的连续区域进行簇优化,双调谐滤波器(Double Tuning,DT)测试指标评价结果表明了优化方案的有效性。     

Relay技术引入对无线网络规划的思考与研究

本文在对LTE-Advanced关键技术研究的基础上,主要针对R10版本中Relay技术的技术点和技术性能进行了深入分析和评估,并对由于Relay技术引入带来的在无线网络结构、无线网络规划以及无线网络规划工具研发等方面的影响进行了研究。为将来LTE网络演进奠定了技术基础。