移动信令网引入DRA方案研究

随着LTE时代的到来,核心网分组域将向EPC网络演进,EPC网络将引入基于IP协议的Diameter信令,核心网将实现基于IP的全互联的网状网络。文章主要针对EPC网络中Diameter信令方式的寻址方式及特点进行分析,并为移动信令网引入DRA组网提供方案建议。     

基于Diameter的下一代信令网研究

介绍了核心网演进的SAE解决方案;阐述了SAE系统下的Diameter信令及DRA引入;通过对DRA的分析得出了DRA组网原则及设置原则;探讨了现网信令网向下一代信令网演进的思路.     

浅析Diameter信令网

随着LTE时代的到来,核心网分组域将向EPC网络演进,EPC网络将引入基于IP协议的Diameter信令。本文主要介绍了Diameter信令网的网络应用、组网模式,并对Diameter信令网与NO.7信令网的关系进行分析。     

爱立信信息（一）

爱立信助瑞士电信提供LTE漫游：近日,爱立信的最新产品--Diameter信令控制器帮助瑞士电信成为欧洲首家推出LTE全球漫游服务的运营商。LTE漫游基于Diameter信令,这是用于移动宽带网络中几乎所有节点之间的一种协议。爱立信Diameter信令控制器部署在爱立信刀片系统平台上,使得该产品的容量具备真正的可扩展性,能够应对持续增长的移动宽带流量,并且还有助于引入LTE语音服务,并发挥重要作用。Diameter信令控制器旨在协调Diamter信令在移动网络中的应用,能支持Di-ameter信令网络的扩展,对系统而言至关重要,需要配备运营商级的软件和硬件。     

4G核心网过渡阶段快速组网方案研究

针对EPC(演进的分组核心网)网络目前尚不具备商用条件,PTN(分组传送网)建设、DRA(路由代理节点)建设以及HLR/HSS(归属位置寄存器/归属用户服务器)融合改造都需要一定时间的情况下,基于网络现状,文章提出过渡阶段快速实现4G核心网的组网方案,重点阐述传输资源以及信令资源的解决方案,以满足4G数据业务需求及双待终端省内短信、语音业务需求。     

5G SA核心网信令组网方式分析

随着信息通信技术的不断发展,移动通信网络逐步向5G演进。5G SA网络基于服务化接口的新的网络架构,各功能实体间采用基于HTTP2.0协议的信令消息,信令网络如何组网成为5G核心网规划和建设的关键。本文通过分析5G信令的特点,提出信令组网的可行方案,为5G信令网组网提供建议和借鉴。     

Diameter信令网组网方案研究

4G、VoLTE以及后续融合通信等业务的出现,对Diameter信令网提出更高的要求。为满足信令转接需求,省内引入多对LDRA。多LDRA组网应划分信令汇接区,要求核心网网元按照LDRA分区方式进行分区,各网元POOL覆盖区域应小于LDRA信令汇接区,避免跨信令汇接区组POOL造成的信令迂回。     

爱立信DSC助澳洲电信应对智能手机浪潮

近日．澳洲电信公司宣布采用爱立信Diameter信令控制器（DSC）扩容无线网络并满足移动宽带使用高速增长的需求。控制信令是电信网络最关键的功能之一，而Diameter已迅速成为使用最广泛的协议之一、     

LTE网络测试仪S6a接口信令监测的实现

文章通过LTE网络测试仪这个平台完成了对LTE系统S6a接口中的Diameter协议信令的监测,阐述了LTE网络测试仪的整体设计方案,介绍了S6a接口Diameter协议的解码原理,重点设计完成了Diameter的呼叫数据记录(CDR)合成,并提出一种hash算法,解决了Diameter的CDR合成问题。最后,通过LTE网络测试系统仿真验证了结论。     

LTE信令监测系统中S6a接口Diameter协议解码模块设计与实现

通过对LTE网络中S6a接口所遵守的Diameter协议研究和分析,设计并实现了其解码模块。为了满足不同功能模块对解码结果的调用,在解码模块中设计和实现了两种不同接口-详细解码接口和简单解码接口。针对传统解码实现中执行速度慢、效率低、代码冗余度大、不易维护等缺点,创新性的提出了分层解码、递归解码等多个解决方案。并通过LTE信令监测系统成功实现了Diameter协议中位置更新请求(Update-Location-Request)过程的解码,证明了设计方案的可行性。此方案已应用于LTE信令监测系统中,效果良好,达到了对Diameter协议解码的目标。     

Towards successful VoLTE and VoWiFi deployment: network function virtualization solutions’ benefits and challenges

The Recent decades have witnessed intensive efforts from operators to implement methods enabling better control over network utilization, service usage, and service monetization. Nevertheless, they report significant growth in Diameter signaling traffic, especially policy management signaling traffic. More specifically, operators offering long term evolution (LTE) data-only services and planning for a massive introduction of voice over LTE (VoLTE) and voice over WiFi (VoWiFi) services need to tackle the enormous growth in Diameter signaling traffic. The biggest challenge for those operators is to find an appropriate solution, scalable enough to handle the unpredictable growth of Diameter signaling traffic; as the VoLTE and VoWiFi services will reshape the landscape of LTE policies. Throughout this paper, we propose a network function virtualization (NFV) based model, mature enough to tackle the challenges of those operators planning to launch VoLTE and VoWiFi, without impacting existing services and without jeopardizing current revenues. In our approach we first used standard VoLTE and VoWiFi message flow and referenced users’ behavior; then we considered NFV architecture characteristics. We finally referred to the latest experiments and test results related to NFV maturity cycle.     

DRA多声道数字音频编码算法的改进

采用2遍扫描和金字塔编码技术对DRA(Digital Rise Audio)多声道数字音频编码算法进行了改进,新算法会依据网络的状况自适应调整传输码率,用可变的DRA码流适应可变的网络条件.当网络条件较好时,用户可欣赏高质量DRA音乐;当网络条件变差时,传输的DRA码流减少,但用户仍可以欣赏流畅的DRA音乐.用比特流容器配置的DRA格式音乐码流在移动智能终端上的播放测试结果表明,在网络状况较差的情况下DRA格式的音乐也能流畅播放.     

Study on Sequential Feeding Networks for Subarrays of Circularly Polarized Elliptical Dielectric Resonator Antenna

Circularly polarized (CP) dielectric resonator antenna (DRA) subarrays have been numerically studied and experimentally verified. Elliptical CP DRA is used as the antenna element, which is excited by either a narrow slot or a probe. The elements are arranged in a 2 by 2 subarray configuration and are excited sequentially. In order to optimize the CP bandwidth, wideband feeding networks have been designed. Three different types of feeding network are studied; they are parallel feeding network, series feeding network and hybrid ring feeding network. For the CP DRA subarray with hybrid ring feeding network, the impedance matching bandwidth (S₁₁<-10 dB) and 3-dB AR bandwidth achieved are 44% and 26% respectively     

Performance of WDM fiber-radio network using distributed Raman amplifier

We investigate the impairment induced by stimulated Brillouin scattering (SBS) effect and noise characteristics of wavelength-division-multiplexing fiber-radio network assisted by distributed Raman amplifier (DRA) or erbium-doped fiber amplifier. Experimental results indicate that forward-pumping DRA can increase the link optical output power limited by SBS effect in downstream transmission and backward-pumping DRA can improve signal-to-noise ratio in upstream transmission, which is verified by binary phase-shift keying transmission experiments. Moreover, our experimental results show that DRA does not introduce additional impairment from interchannel crosstalk due to cross-phase modulation and degradation in spur-free dynamic range.     

AAA新技术Diameter协议的研究及实现

随着IP技术和Internet技术的发展,网络系统中对于认证、授权、计费(AAA)的要求也越来越复杂。传统的认证协议已经无法满足未来网络的需求,为此IETF针对此问题提出并逐渐完善Diameter协议作为下一代AAA的标准协议。简要介绍了Diameter协议的结构特点和一般的AAA系统模型,设计了一个简单的基于Diameter协议的AAA模型,并详细说明了Diameter协议的实现流程。     

Diameter在3G中应用的研究

Diameter是一种新型的AAA协议,在3G系统中有着重要的应用.本文首先介绍了Diameter的基础协议,然后进一步分析了Diameter在3G中的具体应用,包括Diameter在HSS与其它网元交互接口上的应用,以及Diameter在IMS计费上的应用.     

基于国标音频编码标准DRA/DRA+的同步传输系统

本文对基于DRA/DRA+音频压缩算法建设和应用的音频同步传输系统进行了介绍,详细阐述了基于自主研发的DRA/DRA+音频同步编解码器为核心设备,建设的多个音频同步传输系统应用,并对系统建设后在广播传输、覆盖系统中的实际应用项目进行了阐述和分析。最后对基于DRA/DRA+的音频同步传输技术的推广应用的发展前景做了展望。     

User bandwidth usage-driven hnn neuron excitation method for maximum resource utilization within packet-switched communication networks

Mobile and wireless systems beyond 3G are being designed under the user-centric paradigm. Dynamic resource allocation (DRA) is a topic on intensive research to address efficiently such paradigm. Hopfield neural networks (HNN) have proved useful in the past to solve this kind of complex optimization problems. Recently, various approaches have been proposed to realize HNN-based user-centric DRA. However, the initial algorithms suffer from severe instability problems impacting the overall performance. This letter analyses the source of the existing limitations and proposes an enhanced formulation, ensuring maximum resource utilization while optimizing the convergence of the neural network. The letter highlights the improved performance in terms of optimum convergence and bandwidth utilization