移动互联网的资源管理

未来的移动通信系统将是一个全IP网络,核心网采用IP技术,边缘是不同制式的通信系统,因此移动互联网的资源管理显得至关重要。文中针对未来移动互联网的服务质量(QoS)保证问题,探讨移动互联网中的资源管理,详细讨论网络资源管理和无线资源管理中具体的QoS控制技术。对于网络资源管理,主要讨论端到端的资源预留问题,针对资源预留机制不完全适用于移动环境,提出几种改进方案;对于无线资源管理,主要讨论切换、呼叫接纳控制和功率控制技术。最后提出移动互联网资源管理有待进一步研究的课题。     

MPLS在移动IP网络中的应用

移动通信网络和IP网络的融合推动了电信产业的发展。在一个统一的IP网络平台上传输话音、数据、视频、图像将是大势所趋。目前针对移动用户的服务质量(QoS)要求,也正面临着很大的挑战。在移动IP网络中,由于用户的频繁移动使得端到端的QoS保证和移动切换(handoff)管理更加复杂。多协议标签交换(MPLS)技术作为借鉴了面向连接网络的优越性和实现流量工程的重要技术,为网络提供了较好的QoS保证。文章介绍了MPLS技术是如何应用在移动IP网络中,解决了诸如认证、QoS、流量工程等问题。     

移动IP与VPN技术结合的研究

随着电信产业的不断发展,在一个统一的IP网络平台上传输话音、数据、视频、图像将是大势所趋。而下一代移动Internet将是移动通信技术和IP网络技术不断演进和融合的结果,而移动IP技术则是两者的重要结合点。在移动IP网络中,由于用户的频繁移动及切换使得网络的QoS要求面临挑战。又由于移动IP既通过有线链路又通过无线链路,安全问题比普通IP网络大大增加。文章主要应用主流的VPN技术如多协议标签交换（MPLS）、IPSec相结合来应对移动IP中的QoS及安全问题。     

下一代无线网络的移动性管理

在下一代无线网络中,用户可以任意地在不同的无线接入网之间切换。移动IP(MIP:Mobile IP)是当前无线IP网络中的移动性管理协议。但是移动IP协议难以为网络的服务质量(QoS:Qualicy ofService)提供保障。将多协议标记交换(MPLS:Multiprotocol Label Switching)和MIPv6结合的技术是解决这个问题的方案之一。本文介绍了MPLS和移动IP技术的基本原理,研究了基本移动MPLS和分层移动MPLS的实现方案,并基于HMIPv6 over MPLS网络结构介绍了一种为无线网络提供Qos支持的实现方案。     

移动数据与无线IP技术

数字通信技术大大推动了移动数据的发展 移动数据正由窄带低速向宽带高速、移动多媒体通信发展 宽带无线IP网络是移动数据网的发展方向,移动IP多媒体QoS将是人们关注的热点     

基于移动IPv6技术的无线城域网QoS研究

重点介绍了无线城域网中有关IPv6的QoS保证机制．为了提供端到端的QoS保证．除了需要在无线空中接口采用业务分类的动态业务流管理机制外．还需要在IPv6核心网络中采用能提供QoS保证的移动路由管理机制。并对各种支持移动性的InterServ、DiffServ和MPLS等QoS保证机制进行了研究和比较，建议在基于移动IPv6技术的无线城域网中采用扩展的MPLS机制进行核心网的QoS保证。     

基于IP的视频通信技术及相关应用

基于IP视频通信的概念、基本原理,介绍了IP网络的基础和构成,并就IP网络视频应用所采取的各种压缩算法及标准,QoS保证技术,信令技术进行了讨论,最后介绍了无线IP视频通信的相关技术。     

快速IP切换在无线局域网中的实现

在移动网络中,无缝切换是提供QoS的基础,也是支持实时业务应用(如视频点播和语音传输等)的保证。针对无线局域网(WLAN)的节点切换问题,建立了各种网络模型,提出了链路层、网络层和传输层的解决方案。文章根据切换过程的技术特征,研究了WLAN中网络层切换的各种方案,包括移动IP方案、TAP-DANCE方案以及网络辅助的IP移动支持,具体分析了上述方案的实现过程,比较了性能指标,指出了存在的问题及进一步研究方向。     

浅谈无线IP网络中的QoS规范

随着下一代网络的飞速发展,用户之间可以通过多种多样的无线设备相互联络,而这些无线设备则通过一个基于IP的核心网络所提供的无线链路相互连结的。虽然存在如IP协议之类的共同规范,但是要将许多不同的网络融合起来,而这些网络有着各自不同的QoS模型,这无疑将使端到端的QoS保证变得更加复杂。文中讨论了对端到端QoS协议进行标准化的必要性,重点研究了位于服务层的QoS规范,提出了一种通用服务规范(GSS),并对端到端提供QoS保证的服务等级进行了规范。     

移动WiMAX网络端到端QoS解决方案的研究

本文根据移动WiMAX的组网特点和业务流分类,深入分析了无线承载和IP传输承载的QoS机制,给出了一种无线承载和IP传输承载的QoS对应的映射方案,从而解决移动WiMAX系统中端到端的QoS问题.     

利用上下文转移实现移动IPv6上的IMS无缝切换

Mobility support for the next generation IPv6 networks has been one of the recent research issues due to the growing demand for wireless services over internet. In the other hand, 3GPP has introduced IP Multimedia Subsystem as the next generation IP based infrastructure for wireless and wired multimedia services. In this paper we present two context transfer mechanisms based on predictive and reactive schemes, to support seamless handover in IMS over Mobile IPv6. Those schemes reduce handover latency by transferring appropriate session ＇information between the old and the new access networks. Moreover, we present two methods for QoS parameters negotiations to preserve service quality along the mobile user movement path. The performances of the proposed mechanisms are evaluated by simulations.     

Providing quality of service in always best connected networks

The next generation of mobile systems is expected to support multiple radio access technologies, as well as diverse types of terminals, including mobile phones, personal digital assistants, and laptops, as well as personal area, moving, and sensor networks. Thus, future wireless systems will not only continue to break technological barriers in terms of new air interface capabilities, higher bit rates, mobility, security, and QoS management, but will present new end-to-end scenarios in which applications access services over multiple L2 hops and multiple IP networks. The term always best connected refers to the concept of defining a set of access selection criteria and mechanisms that allow users to get connected to various services in a nearly optimal manner. Providing QoS in this type of heterogeneous multihop environment is a challenging task because applications may be completely unaware of them scenario and the underlying layer 2 technologies that can be quite different at different hops. For instance, some wireless links may have scarce resources and highly optimized QoS mechanisms; others may not support explicit QoS handling at all. In this article we consider the use of IP-level QoS signaling as a key component to support the end-to-end QoS for various applications. We propose a small set of application programmer- and wirelesslink-friendly IP QoS parameters (wireless hints) and illustrate the use of these in a specific WLAN-to-cellular handover situation. We conclude that the proposed model, signaling protocol, and wireless information elements can efficiently support QoS in heterogeneous mobile environments.     

Mobility management in next-generation wireless systems

This paper describes current and proposed protocols for mobility management for public land mobile network (PLMN)-based networks, mobile Internet protocol (IP) wireless asynchronous transfer mode (ATM) and satellite networks. The integration of these networks will be discussed in the context of the next evolutionary step of wireless communication networks. First, a review is provided of location management algorithms for personal communication systems (PCS) implemented over a PLMN network. The latest protocol changes for location registration and handoff are investigated for mobile IP followed by a discussion of proposed protocols for wireless ATM and satellite networks. Finally, an outline of open problems to be addressed by the next generation of wireless network service is discussed     

RSVP Extensions for Real-Time Services in Hierarchical Mobile IPv6

The Mobile IPv6 (MIPv6) provides many great features, such as sufficient addressing space, mobility, and security; MIPv6 is one of the most important protocols for next generation mobile Internet. Simultaneously, with the rapid improvement of wireless technologies, the real-time multi-media IP services such as video on demand, videoconference, interactive games, IP telephony and video IP phone will be delivered in the near future. Thus, to furnish accurate QoS for real-time services is one of the most important thing in the next generation mobile Internet. Although RSVP, which is a resource reservation protocol, processes signaling messages to establish QoS paths between senders and receivers, RSVP was originally designed for stationary networks and not aware of the mobility of MNs. Therefore, this paper proposes a novel RSVP extension to support real-time services in Hierarchical Mobile IPv6 (HMIPv6) environments. For intra-site mobility, the concept of QoS Agent (QA) is proposed to handle the RSVP QoS update messages and provide the advanced reservation models for real-time services. For inter-site mobility, IP multicast can help to invite inter-site QAs to make pre-reservation and minimize the service disruption caused by re-routing the data path during handover. Simulation results show that the proposed scheme over HMIPv6 is more suitable for real-time services than the famous RSVP tunnel-based solution.     

Mobility management in current and future communications networks

This article describes current and proposed protocols for mobility management for public land mobile networks (PLMNs), Mobile IP, wireless ATM, and satellite networks. The integration of these networks is discussed in the context of the next evolutionary step of wireless communications networks. First, a review is provided of location management algorithms for PCS implemented over a PLMN. The latest protocol changes for location registration and handoff are investigated for Mobile IP, followed by a discussion of proposed protocols for wireless ATM and satellite networks. Finally, an outline of open problems to be addressed by the next generation of wireless network service is discussed     

Extensions for Internet QoS paradigms to mobile IP: a survey

Mobile IP has been chosen as the core mobility management mechanism for wireless LANs, 3G cellular networks, and, most recently, aeronautical networks. It is viewed as a key element in providing a universal roaming solution across different wireless access technologies. However, mobile IP in its basic form inherits the IP incapability to provide QoS guarantees. This results in mobile IP's lack of support for seamless intradomain mobility. This article surveys extensions that have been proposed to enhance the QoS functionality of mobile IP. It gives a brief overview of mobile IP and Internet QoS paradigms, and describes their general shortcomings with regard to QoS and mobility, respectively. It then discusses the extensions that have been proposed in the literature and provides a qualitative comparison.     

移动服务质量框架的研究与展望

支持服务质量是下一代移动互联网的重要目标之一.然而,在移动环境下支持服务质量是一项非常有挑战性的工作.本文探讨了目前提出的支持移动服务质量的各种框架,并对这些框架的技术特点做了分析与比较,最后讨论了未来移动服务质量的发展趋势和有待研究的课题.     

QoS Challenges in Wireless Sensor Networked Robotics

Wireless sensor networks and mobile robotics are two hot research topics. Integrating them leads to a wide range of new applications in many different environments such as terrestrial, underwater, underground and aerial. Where sensor networks are mainly used for large-scale monitoring and control, mobile robotics are used for performing fine-scale actions and automation. Network heterogeneity together with stringent Quality of Service (QoS) demands from applications such as voice and video make QoS support very challenging. Therefore, this paper investigates the QoS challenges in wireless sensor networked robotics and presents a novel QoS framework as solution to cope with these challenges.     

Mobile flow-aware networks for mobility and QoS support in the IP-based wireless networks

As the volume of mobile traffic consisting of video, voice, and data is rapidly expanding, a challenge remains with the mobile transport network, which must deliver data traffic to mobile devices without degrading the service quality. Since every Internet service holds its own service quality requirements, the flow-aware traffic management in fine granularity has been widely investigated to guarantee Quality of Service (QoS) in the IP networks. However, the mobile flow-aware management has not been sufficiently developed yet because of the inherent constraints of flow routing in the mobile networks regarding flow-aware mobility and QoS support. In this paper, we propose a flow-aware mobility and QoS support scheme called mobile flow-aware network (MFAN) for IP-based wireless mobile networks. The proposed scheme consists of dynamic handoff mechanisms based on QoS requirements per flow to reduce the processing overhead of the flow router while ensuring QoS guarantee to mobile flows. The performance analyses of the proposed scheme demonstrate that MFAN successfully supports the mobile flow traffic delivery while satisfying the QoS requirement of flows in the wireless mobile IP networks.     

A Novel Optimal Channel Partitioning Algorithm for Integrated Wireless and Mobile Networks

How to efficiently support multi-class services is a very important issue in integrated wireless and mobile networks because each type of services has distinct characteristics and quality of service (QoS) requirements. This paper presents an efficient algorithm for near optimal channel allocation when different types of services are to be provided in the next generation integrated wireless and mobile networks. We specifically propose a preemptive priority scheme for an integrated wireless and mobile network by first dividing channels into three independent groups and classifying traffic into four different types. The proposed system is modeled by a multi-dimension Markov chain model. Then such a model is used to obtain a set of relations that correlate performances with various system parameters. A novel recursive algorithm is developed to determine the minimal number of channels in each channel group that would be necessary to satisfy the QoS requirements. We also investigate the impact of load ratio for different types of traffic on channel assignment. Finally, we discuss some limitations of our approach and indicate possible future work. We believe that the partitioning scheme proposed in this paper can become a starting point for analysis of future integrated wireless and mobile networks.