WLAN-3GPP融合架构中网络选择机制优化

为了综合利用WLAN与3GPP移动网络各自的优势,3GPP R9定义了3GPP与WLAN网络融合体系架构,并在3GPP与WLAN网间选择中引入接入网发现和选择功能单元(ANDSF)网络选择机制。文章在研究WLAN-3GPP融合参考体系架构与现有ANDSF网络选择机制基础上,分析了基于ANDSF网络选择机制的不足,提出了一种基于用户业务感知与ANDSF相结合的WLAN-3GPP融合架构网络选择方案,为融合架构中3GPP与WLAN网络切换提供了基础,有效提高用户体验与网络控制能力。     

基于智能终端辅助的ANDSF网络选择机制增强

随着LTE与WLAN热点的大规模建设部署,为了综合利用WLAN与3GPP移动网络各自的优势,3GPPR9定义了3GPP与WLAN网络融合架构体系,并在3GPP与WLAN网间选择中引入ANDSF(Access Network Discovery Support Functions,接入网发现和选择功能单元)网络选择机制。本文在研究3GPP-WLAN融合参考体系架构与现有ANDSF网络选择机制基础上,针对ANDSF网络选择机制的不足,提出了一种基于智能终端用户业务感知与ANDSF相结合的网络选择增强方案,为融合架构中3GPP与WLAN网络切换提供了基础,有效提高用户体验与网络控制能力。     

WLAN分流技术在智能管道中的应用

文章认为由于智能终端和移动互联网的发展给移动网络带来巨大压力,因此为移动用户提供无线局域网(WLAN)接入成为移动网络数据业务分流的重要手段。基于WLAN分流技术,文章分析了用于解决WLAN和移动网络业务连续性问题的新技术,如全球移动通信系统增强数据传输速率技术无线接入网络/陆地无线接入网/通用移动通信系统陆地无线接入网/陆地无线接入网/增强通用移动通信系统陆地无线接入网(GERAN/UTRAN/E-UTRAN)与WLAN网络之间的业务连续性技术、接入网络发现和选择功能和非无缝的WLAN分流技术。     

3GPP与WLAN互连的技术

主要介绍第三代移动通信合作计划(3GPP———3GPartnershipProject)与无线局域网(WLAN)互连的结构,3GPP用户可通过WLAN开展WLAN接入业务。在WLAN中,通过3GPP预约,使用客户识别模块(SIM)/用户服务识别模块(USIM)接入通用IC卡(UICC),使3GPP与WLAN终端互连。文中还介绍基于3GPP的WLAN接入认证授权、IEEE802.11i中的认证和密钥协定、3G-WLAN互连中的认证和授权、复用3GPP的归属位置注册器等,描述了用户数据如何选路和接入业务,最后介绍WLAN中基于3GPP的计费方法(预付费和后付费),以及如何对这些用户计费和对归属网络中基于IP的计费。     

PON＋WLAN方案实现固定移动网络融合

在智能终端大规模应用的刺激下,移动互联网业务也得到了蓬勃发展,消费市场对无线接入的带宽需求与目俱增。各运营商的2G／3G网络数据流量负荷严重,迫切需要低成本、高带宽的WLAN接入网来缓解2G／3G网络压力。而现有WLAN的网络带宽和服务质量还存在不足,用户体验有待提升。打造运营级的WLAN网络的需求日趋迫切,运营商在建设WLAN网络时遇到了很多难题。     

3G时代异构无线网络的融合

文章介绍了有关3GPP2和3GPP互操作的网络架构,分析了3GPP2 UE通过WLAN接入到3GPP2核心网的PS域的应用场景,提出了实现3GPP2 UE通过WLAN接入3GPP核心网的实现方法,以便实现多种接入方式下的业务融合.     

演进的3GPP核心网中基于网络的移动性管理

3GPP系统结构演进的一个关键方面是支持多种接入网的演进分组核心的规范。演进分组核心是使运营商部署3GPP无线接入网（如E—UTRAN、uTRAN和GERAN）以及其他非3GPP无线和有线接入网（如eHRPD、WLAN、WiMAX和DSL／电缆）并使其运行的一个公共分组核心网,它为运营商提供公共系列的服务和跨越各种网络的能力。对演进分组核心的关键要求是,当用户在一个接入网中和在不同的接入网间移动时,能保持IP层无缝隙的移动性。本文综述了演进分组核心的规范．该规范在PMIPv6协议的基础上用基于网络的移动性机制来实现接入网间的移动性。为用户跨越不同技术的会话提供无缝隙移动性的重要意义在于确保用户在不同接入网间运动时能同时保持服务质量。本文还对补充PMIPv6的“离径”QoS模型作了简要叙述。     

3G/WLAN交互网络

3G／WLAN系统的交互，通过无线局域网（WLAN）接入控制功能增加新业务功能，如先进业务支持、实时对等IP通信等；通过引进WLAN和蜂窝IP连接不同类型动态交换；利用多种接入技术和用户内部先进技术来提供不中断业务和可靠安全接入.3G／WLAN是迈向新一代无线移动网络的关键，在系统性能上具有巨大的技术优势，同时也将发挥出巨大的市场潜力。3G通信系统标准组织（3GPP）把3G／WLAN交互系统作为3GPP的附加标准。在移动环境中，3G／WLAN网络双模终端可提供无处不在、带宽可变、服务质量（QoS）可保证的多种高速率业务。     

基于MIH协议的WiMAX与WLAN重叠网络垂直切换研究

随着各种无线接入技术的迅速发展,用户多模终端设备如何在各种重叠覆盖的接入网络之间完戍快速的垂直切换成为热门研究课题。3GPP组织提出了UT黜州（UMTS陆地无线接入网）与WLAN网络信令互通标准．IEEE组织为了满足IEEE802体系之间各种接入技术的互通,提出了IEEEMIH（媒体独立切换）802．21标准。文章利用...     

基于ANDSF实现WLAN和蜂窝网间选网机制的增强

随着蜂窝网的不断升级、WLAN热点的广泛部署和智能终端的大量普及,用户希望拥有一致、平滑、高速的业务体验。为了合理地利用网络资源、方便用户选择最合适的接入网,在WLAN和蜂窝网间选择合适的接入网起着重要作用。本文综述了现有接入网发现和选择的相关技术,分析了基于ANDSF(access network discovery and selection function,接入网发现和选择功能)实现WLAN和蜂窝网间选网的局限性,提出了ANDSF机制中基于接入网状态进行接入网选择的方案。     

IMS及其与WLAN的互通模型研究

3GPP IMS与WLAN之间的互通可以将IMS核心网络业务扩展到WLAN接入环境中,同时使WLAN成为3GPP系统的一种补充接入技术。介绍了3GPPIMS的网络结构,分析了IMS中SIP协议及其扩展,重点讨论了IMS与WLAN的互通模型,以及如何支持3GPP目前定义的几种业务互通等级。     

Dynamic network composition for beyond 3G networks: a 3GPP viewpoint

The 3GPP network specification is currently undergoing major updates toward beyond 3G. The evolved 3GPP network will support interworking with multiple including non-3GPP - radio access networks, and support mobility between them. It will furthermore support personal area networks and moving networks. Generally, 3GPP is moving in the direction of an all-IP network. This article gives an overview of current beyond 3G trends in 3GPP, and particularly introduces a new 3GPP study item on network composition. The concept of network composition was developed by the EU project Ambient Networks. Whereas 3GPP until now assumes static networking relations, network composition addresses a dynamic, generic establishment of control-plane interworking between the heterogeneous network types of today, such as 3GPP core networks, non-3GPP operator networks, heterogeneous access networks, and personal area networks     

IP Flow Mobility in PMIPv6 Based Networks: Solution Design and Experimental Evaluation

The ability of offloading selected IP data traffic from 3G to WLAN access networks is considered a key feature in the upcoming 3GPP specifications, being the main goal to alleviate data congestion in cellular networks while delivering a positive user experience. Lately, the 3GPP has adopted solutions that enable mobility of IP-based wireless devices relocating mobility functions from the terminal to the network. To this end, the IETF has standardized Proxy Mobile IPv6 (PMIPv6), a protocol capable to hide often complex mobility procedures from the mobile devices. This paper, in line with the mentioned offload requirement, further extends PMIPv6 to support dynamic IP flow mobility management across access wireless networks according to operator policies. Considering energy consumption as a critical aspect for hand-held devices and smart-phones, we assess the feasibility of the proposed solution and provide an experimental analysis showing the cost (in terms of energy consumption) of simultaneous packet transmission/reception using multiple network interfaces. The end-to-end system design has been implemented and validated by means of an experimental network setup.     

UMTS-WLAN异构网络互联的方案研究

通用移动通信系统(UMTS)为移动数据用户提供了较广阔的覆盖范围,而无线局域网(WLAN)能在局部热点地区提供较高的接入带宽.两种网络的显著优势能够相互结合,为处于异构网络覆盖地区的用户提供网间无缝连接.本文总结了目前UMTS-WLAN互联的三种实施方案:移动IP、互联网关和仿真器.在分别介绍三种方案的体系架构、互联机制和切换流程后从互联层次、信令和数据流向、对现有网络的改造、安全认证机制及用户管理方式等不同层面分析三种方案的特点.     

3GPP LTE/WLAN无线融合技术研究进展

总结了4种在无线侧实现长期演进(LTE)系统与无线局域网(WLAN)相互融合的技术方案.在分析传统的核心网融合方案不足之处的基础上,重点介绍了无线融合在3 GPP R12和R13阶段的研究进展和标准化情况,讨论了各方案对终端、演进型节点B(eNodeB)和WLAN的影响,综合对比了每种方案的特征、优缺点及应用场景,为运营商部署LTE/WLAN融合网络提供了思路.     

A novel congestion control model for interworking AAA in heterogeneous networks

In the 3rd generation partnership project (3GPP) and wireless local area network (WLAN) interworking networks, 3GPP authentication, authorization, accounting (AAA) server located in 3GPP core network will be responsible for the AAA request from WLAN access network (AN). However, centralized AAA deployment is bound to give rise to the single point failure, resulting in system congestion. In order to solve this problem, this paper presents a novel congestion control model for AAA. In addition, through analyzing the model, the conclusion can be drawn that the average congestion rate of extensible authentication protocol (EAP) user request is related with factors, such as the arrival rate of EAP request, the number of EAP re-authentication, and the system buffer queue length. Finally, the simulation results show that EAP request arrival rate is directly proportional to the congestion rate, and when the number of EAP re-authentication and system buffer queue length are fixed, the number of corresponding user authentication vectors should be directly proportional to the EAP request arrival rate, so as to ensure the average congestion rate of EAP request is less than 0.005.     

一种改进的WLAN与3GPP系统互连框架

提出了一种改进的WLAN与3GPP系统互连框架及其网络切换的方法,新增一个服务器MS,负责建立和维护AP信息列表,检测假冒AP,均衡网络AP负载;参与预认证过程,防止恶意终端进行DOS攻击;基于移动终端的位置、移动性的预测选择目标AP,避免切换的盲目性和不必要的开销;结合终端的业务类型和签约服务等级进行具有优先级的切换,提高运营商运营效益和QoS,保证资源的合理利用.     

Improved IPSec tunnel establishment for 3GPP–WLAN interworking

Interworking between wireless local area network (WLAN) and the 3rd Generation Partnership Project (3GPP) such as Long Term Evolution (LTE) is facing more and more problems linked to security threats. Securing this interworking is a major challenge because of the vastly different architectures used within each network. Therefore, security is one of the major technical concerns in wireless networks that include measures such as authentication and encryption. Among the major challenges in the interworking security is the securing of the network layer. The goal of this article is twofold. First, we propose a new scheme to secure 3GPP LTE–WLAN interworking by the establishment of an improved IP Security tunnel between them. The proposed solution combines the Internet Key Exchange (IKEv2) with the Host Identity Protocol (HIP) to set up a security association based on two parameters, which are location and identity. Our novel scheme, which is called HIP_IKEv2, guarantees better security properties than each protocol used alone. Second, we benefit from Mobile Internet Key Exchange protocol (MOBIKE) in case of mobility events (handover). And we extend HIP_IKEv2 to HIP_MOBIKEv2 protocol in order to reduce the authentication signaling traffic. The proposed solution reinforces authentication, eliminates man‐in‐the‐middle attack, reduces denial‐of‐service attack, assures the integrity of messages, and secures against reply attack. Finally, our proposed solution has been modeled and verified using the Automated Validation of Internet Security Protocols and Applications and the Security Protocol Animator, which has proved its security when an intruder is present. Copyright © 2014 John Wiley & Sons, Ltd.