LTE核心网中基于PCC的QoS控制和能力开放技术研究

在LTE核心网中,通过引入PCC机制,来实现应用层业务数据流QoS需求到核心网承载层QoS分组过滤器之间的一致性映射和匹配问题。文章在详细介绍和分析LTE核心网中承载层QoS机制和PCC总体架构的基础上,研究如何将二者结合起来实现基于PCC和网络能力开放平台的QoS控制,从而提升运营商掌控网络提供业务的能力并改善用户的业务体验。     

UMTS及LTE／SAE网络端到端的QoS研究

通过对LTE／SAE系统的QoS与3GPPUMTS的QoS实现机制的分析与比较,介绍了移动通信网络中QoS的发展历程,最后概括介绍了基于策略和计费控制（PCC）架构的QoS研究。     

一种PCC对CDMA2000 HRPD网络进行QoS策略控制的方案

3GPP与3GPP2针对各自主要的承载网络提出了不同的策略控制架构,分别是PCC与SBBC。由于两者QoS策略控制的基本原理相同,所以SBBC将和PCC一起完成其标准的研究和制定。本文总结并比较了PCC与SBBC的架构及实体接口功能;然后基于已提出的E-UTRAN与eHRPD互操作规范基础设计出一种PCC对CDMA2000 HRPD网络进行QoS策略控制的方案,建立QoS来实现承载资源的分配。     

LTE网络中PCC架构的应用

LTE技术是新一代宽带无线移动通信网技术,可大幅提升无线网络业务速率,并采用统一的分组域核心网承载话音和数据业务,而IP网络承载语音等实时业务的质量保证是业界关注的问题。3GPP标准的PCC架构可有效实现LTE网络数据业务差异化的管理和运营,并提供业务端到端的质量保证,是LTE网络中实现语音业务等实时业务的关键。本文对PCC架构以及控制机制进行简要介绍,并结合LTE和PCC技术的发展情况,对PCC在LTE网络中的应用及引入方式进行探讨。     

移动互联网端到端流量管控策略研究

本文通过对无线网络新技术和新架构的分析,针对2G/3G/LTE/WLAN多网络环境下,研究如何对不同的用户类型、业务类型、时间段、累积量进行QoS控制,以提升业务体验和用户满意度。基于PCC承载架构和ANDSF多连接管理机制,通过端到端的流量管控技术提升互联网带宽的使用率。借鉴都江堰水利工程原理,通过实施网络流量控制、均匀网络流量、降低并有效控制流量峰值,提出了移动互联网网络协同的融合策略控制方案,实现了合理配置网络资源、合理有效控制网络投资,为移动互联网业务发展创造条件,为移动互联网时代应对数字洪水做好充分的技术储备。     

端到端的LTEQoS控制技术与策略研究

LTE网络提供了非常重要的QoS保证特性,为实现差异化服务和网络资源智能化管理提供了重要手段,然而,端到端QoS控制也是LTE技术的难点。分析了LTE QoS控制对象的含义、类型以及LTE QoS参数,并提出从业务支撑系统到LTE网络的端到端QoS控制架构以及系统控制流程,最后探讨了LTE QoS的控制策略。     

WiMAX网络中QoS机制和PCC架构研究

本文在介绍WiMAX空中接口QoS技术和其在网络中QoS控制模型的基础上,重点讨论集基于流计费和QoS管理为一体的WiMAX网络PCC架构,并给出了漫游情形下的一种PCC信令流程。摘要     

一种基于PCC与RACS的固移融合策略控制方案

固定网络与移动网络的融合已成为下一代网络发展的必然趋势,而IMS(IP Multimedia Subsystem)由于其实现具有接入无关性,已成为下一代网络核心控制的主流选择方案。本文基于IMS的核心网络架构,通过探讨两大规范组织——3GPP与TISPAN——对不同接入网类型(移动与固定)的策略控制方案(PCC/RACS),给出一种基于RACS和PCC的策略控制融合体系架构,实现对同一业务在不同网络间切换的统一资源控制,并提供连续的QoS保障。最后,本文对所提出的方案进行相应的实现与有效性测试。     

移动互联网网络协同的融合策略控制研究

本文致力于移动互联网络的服务质量优化和管理。通过对网络新技术和新架构的分析,针对2G/3G/LTE/WLAN多网络环境下,研究对不同的用户类型、业务类型、时间段、时长进行QoS和流量、带宽的控制,提升业务体验和用户满意度的方法。从网络整体来看,可以通过端到端的流量管控技术提升互联网带宽的使用率,实施网络流量控制、均匀网络流量、降低并有效控制流量峰值,合理配置网络、合理有效控制网络投资,实现网络协同,为移动互联网业务发展创造条件。文中通过对移动互联网的特点和未来发展的分析,基于PCC承载架构,提出了致力于移动互联网网络协同的融合策略控制方案,为移动互联网时代应对数字洪水做好充分的技术储备。     

FMC演进及部署策略

FMC产生的技术背景 固网移动网融合（FMC）是当前电信业最热门的话题,其产生背景源于通信技术的快速进步及全网的IP化浪潮.目前,TISPAN、ITU-T、3GPP等多个标准组织均已在网络融合与演进方面开展了大量的工作,制定了一系列规范,其中3GPP的演进思路是在R5中引入IMS子系统,逐步在IMS中定义了对PLMN/PSTN的支持、QoS保障、用户的漫游管理、离/在线和基于流的计费模型、不同电信网间互连的支持以及CS/IMS融合等问题,并计划最终在R7基本实现基于IMS的FMC架构.同时,TISPAN的R1及后续版本的思路都是以3GPPR5的IMS架构为模型,从固网逐步演进到以IMS为单一核心、能够提供丰富多媒体业务、实现快速及低成本业务部署的全FMC架构网.     

基于电信网的家庭网关

下一代网络(NGN)业务的驱动和FMC融合的推动,以家庭网关为核心的家庭网络成为目前关注的焦点.家庭网关标准还处于起草的起步阶段,论证了家庭网络组网模型、家庭网关基本业务、基本功能、关键技术(如接入技术)、QoS、安全、管理及所存在的问题.     

固网软交换向IMS演进方案

固网软交换向IP多媒体子系统(IMS)演进应采用合理的方法、步骤和策略。演进可以在继承原软交换(SS)公共交换电话网络业务仿真子系统(PES)业务功能的前提下,平滑地向IMS演进,逐步引入、扩展多媒体和移动业务,实现核心网层面的固定和移动融合(FMC)。下一代网络(NGN)核心控制层的软交换和IMS在基本架构上没有实质冲突,软交换主要面向公共交换电话网(PSTN)仿真业务,而IMS为实现FMC和多媒体业务,在移动性、安全、服务质量(QoS)、开放业务架构等方面作了有益的扩展,软交换向IMS演进在技术上是完全可行的。对于已经采用软交换的运营商,采用演进的方式实现基于IMS的全业务的NGN网络,可以节约投资,减小网络改造风险,降低运营成本。     

An Absolute QoS Framework for Loss Guarantees in Optical Burst-Switched Networks

In order to meet the requirements of real-time applications, Optical Burst Switched backbone networks need to provide quantitative edge-to-edge loss guarantees to traffic flows. For this purpose, there have been several proposals based on the relative differentiation quality of service (QoS) model. However, this model has an inherent difficulty in communicating information about internal network states to the edge in a timely manner for making admission control decisions. In this paper, we propose an absolute QoS framework to overcome this difficulty. The key idea is to offer quantitative loss guarantees at each hop using a differentiation mechanism and an admission control mechanism. The edge-to-edge loss requirement is then translated into a series of small per-node loss probabilities that are allocated to the intermediate core nodes. The framework includes a preemptive differentiation scheme, a node-based admission control scheme and an edge-to-edge reservation scheme. The schemes are analyzed and evaluated through simulation. It is shown that the framework can effectively offer quantitative edge-to-edge loss guarantees under various traffic conditions.     

End-to-End Adaptive QoS Provisioning over GPRS Wireless Mobile Network

The General Packet Radio Service (GPRS) offers performance guaranteed packet data services to mobile users over wireless frequency-division duplex links with time division multiple access, and core packet data networks. This paper presents a dynamic adaptive guaranteed Quality-of-Service (QoS) provisioning scheme over GPRS wireless mobile links by proposing a guaranteed QoS media access control (GQ-MAC) protocol and an accompanying adaptive prioritized-handoff call admission control (AP-CAC) protocol to maintain GPRS QoS guarantees under the effect of mobile handoffs. The GQ-MAC protocol supports bounded channel access delay for delay-sensitive traffic, bounded packet loss probability for loss-sensitive traffic, and dynamic adaptive resource allocation for bursty traffic with peak bandwidth allocation adapted to the current queue length. The AP-CAC protocol provides dynamic adaptive prioritized admission by differentiating handoff requests with higher admission priorities over new calls via a dynamic multiple guard channels scheme, which dynamically adapts the capacity reserved for dealing with handoff requests based on the current traffic conditions in the neighboring radio cells. Integrated services (IntServ) QoS provisioning over the IP/ATM-based GPRS core network is realized over a multi-protocol label switching (MPLS) architecture, and mobility is supported over the core network via a novel mobile label-switching tree (MLST) architecture. End-to-end QoS provisioning over the GPRS wireless mobile network is realized by mapping between the IntServ and GPRS QoS requirements, and by extending the AP-CAC protocol from the wireless medium to the core network to provide a unified end-to-end admission control with dynamic adaptive admission priorities.     

PCC端到端QoS部署策略研究

PCC系统是运营商网络智能化管控的基础,而分级QoS保障是其一项标志性应用,可有效实现基于用户、业务分级及其他组合策略的网络管控。本文从PCC端到端QoS部署关键技术、网络架构、实现机制进行分析,并对PCC端到端QoS实际部署的关键问题进行研究。     

基于WiBro接入技术的FMC解决方案

简要介绍FMC的基本概念和IMS的体系结构,分析以IMS为核心的FMC技术策略。最后重点介绍KT提出的基于WiBro技术的FMC实现方案。     

Improving session continuity through user mobility tracking for EPS inter‐serving gateway handover

The Evolved Packet System (EPS) is standardized to support a common IP‐based core network with heterogeneous radio accesses in the latest 3GPP release. In the EPS, the Policy and Charging Control (PCC) framework provides dynamic policy control combined with real‐time charging management. Long core network signaling for PCC degrades session continuity performance during handover. In this paper, we investigate the handover for an EPS session. Based on the results, we propose a proactive scheme along with a user mobility tracking model to improve session continuity. More specifically, our proposed scheme attempts to reduce PCC reauthorization signaling delay during the handover procedure. Then, we formulate a Markov process to model the user mobility pattern and to derive the session continuity probability. Numerical results show that our scheme can significantly keep the session continuity at a user acceptable level even when the mobility pattern is high. We also provide guidelines for operators to set up the network configuration parameters according to various traffic conditions. Copyright © 2011 John Wiley & Sons, Ltd.     

Quality of Service for Rapidly Deployable Radio Networks

In this paper, we present an end-to-end QoS provisioning mechanism for a Rapidly Deployable Radio Network (RDRN). A flow specification tailored for a highly dynamic mobile networking environment has been proposed. The instability of wireless links and the mobility of the nodes influence the flow specification. A flow establishment scheme that uses in-band signaling to establish the flows has been described. This approach is designed to make efficient use of the features of IP at the network level and ATM at the link level. In the event of non-availability of the requested QoS, the flow establishment scheme constantly attempts to scale up to the maximum requirements of the application, and establishes the flow when the resources become available. A QoS architecture for an RDRN system has also been proposed, which provides the framework for the configuration, prediction and maintenance of the end-to-end QoS.