MBMS业务的技术实现及相关标准

介绍了移动通信网MBMS业务的特点和网络架构,阐述了MBMS系统中的主要功能实体和相关接口以及MBMS广播业务的业务流程,并指出移动通信网MBMS相关的国际、国内标准,分析了MBMS技术的创新点和MBMS业务的应用前景。     

从MBMS向E-MBMS的演进

经过长期的研究和发展,多媒体广播/组播业务(MBMS)在R6、R7版本的3G系统中已经取得了完整的实现,但是仍然无法满足日益增长的业务需求,尤其是用户和运营商对手机电视业务的强烈需求。随着R8规范的开始制定,一方面为了进一步提高MBMS的业务性能,另一方面需要适应新的系统架构演进/长期演进(SAE/LTE)系统,MBMS在逻辑架构、业务模式、传输方式和信道结构等方面进行了重大改进。通过分析研究,文章就这几个方面详细地阐述了从现有的MBMS(即R6/R7 MBMS)到演进多媒体广播/组播业务(E-MBMS)(包括SAE MBMS和LTE MBMS)的演进过程。     

基于LTE MBMS的手机电视业务的研究

文章介绍了目前世界手机业务的发展状况,分析了普遍使用的3G网络中的手机电视业务的应用瓶颈、弊端,并对手机电视业务的载体多媒体广播/组播业务（MBMS）网络结构、业务流程进行了分析,对基于长期演进（LTE）网络MBMS技术从逻辑架构、业务模式、传输模式、信道结构等方面进行了分析研究,最后给出了LTE中MBMS的实现方法及LTE网络中基于MBMS技术的手机电视业务的流程。     

MBMS密钥分发过程研究

移动多媒体业务是3G的关键业务,3GPP R6版本中引入多媒体广播组播业务MBMS(Multimedia Broadcast Multicast Service).业务安全在多媒体广播组播业务中至关重要,文中给出了3GPP中MBMS的密钥管理体系和基于GBA的MBMS业务安全体系架构,并分析了MBMS密钥分发的具体实现流程.     

基于MBMS的手机电视技术

多媒体广播组播业务(MBMS)是3GPP Release 6版本中引入的一项重大功能,目的在于节省系统资源,为用户提供广播或者组播的分组数据业务.作为一种具体的MBMS应用,手机电视技术在3G业务中占有重要的地位.文中介绍了多媒体广播和组播技术(MBMS),包括MBMS的网络结构、业务流程以及基于TD-SCDMA的MBMS系统架构,对LTE中的E-MBMS技术进行了初步研究,并从逻辑结构、业务模式和信道结构等方面简单分析了从MBMS到E-MBMS的演进.     

一种新颖的针对单小区点对多点e MBMS业务传输技术(英文)

多媒体广播多播业务(MBMS)是3GPP R6版本中定义的一种典型的广播、多播业务。随着技术的演进,在LTE系统中提出了增强的MBMS,即e MBMS业务。针对e MBMS业务,提出了一种有效的技术解决方案。该方案可看作下行发射分集、基于DoA的波束赋形与HARQ技术的结合。同     

MBMS的现状与发展

一、MBMS概要介绍 1．MBMS架构与功能 MBMS（Multimedia Broadcast Multicast Service多媒体广播组播业务）时一种可以将多媒体数据从单个源点传送到多个接收端的业务。这实质上是一种对网络资源进行优化使用的方式,MBMS架构使得无线资源和核心网资源能够得到有效的利用。为实现MBMS需要对3GPP架构进行两方面的改进：一方面在现有功能实体中（包括SGSN、GGSN、UTRAN、GERAN和UE）,增加支持MBMS的能力;     

移动多媒体广播业务中的密钥保护

MBMS移动多媒体广播业务是指以广播形式向具有操作系统和视频功能的移动通信终端传送数字音视频内容（例如电视等）,利用移动通信网络双向信道实现对业务及用户的管理和计费,并向用户提供互动应用的业务。MBMS中业务保护保障了计费和传输安全,使MBMS具有私密性。     

动态控制MBMS速率提高移动网络利用率

文中提出了两种通过动态控制MBMS(多媒体广播及组播)业务速率以提高网络利用率的方法.现有的MBMS业务都只能通过分配固定空口资源给用户提供固定不变的数据速率.文中通过分析移动网络中不同MBMS业务之间和非MBMS业务之间的资源抢占情况,发现动态调整MBMS业务数据速率可以极大提高网络利用率.根据此结论,设计可分层信息编码和设计不同数据流都可以实现动态控制.这两种解决方案都具有极高的使用价值.     

MBMS业务平台测试浅析

对MBMS业务进行了简要介绍,然后就MBMS系统构架中的主要部分,MBMS业务流程以及MBMS相关标准进行了系统阐述,最后针对MBMS测试提出了相关测试方案。     

IMT—Advanced增强多媒体多播技术

多媒体多播（MBMS）通过点到多点方式实现由一个数据源向多个用户发送数据,能有效节省网络资源,是下一代宽带移动通信系统关注的重点技术。文章基于MBMS技术的发展历程、最新标准进展、前沿研究热点、演进过程,剖析了第3代移动通信系统（UMTS）R6MBMS和第3．9代移动通信系统（LTE）R10增强多媒体多播（E—MBMS）的逻辑架构;阐述了LTER10中E-MBMS的协议设计,包括关键术语、区域配置、逻辑信道映射和复用、控制消息流程及计数过程;给出了IMT—Advanced中E-MBMS技术发展,包括多基站协作、分层编码、喷泉码传输和终端协作传输的新趋势。     

The multimedia broadcast/multicast service

This article provides an overview of the multimedia broadcast/multicast service (MBMS) for universal mobile telecommunications system (UMTS) networks. We first outline the features of UMTS networks as defined by the 3rd generation partnership project (3GPP) in order to provide a background for the discussion to follow. We then present the overall MBMS architecture, the services that it provides to the users and the differences between the broadcast and multicast options. The implementation details of MBMS are explained in terms of the modifications needed to the network, the new signaling procedures required and the impact of MBMS on the radio part of the network. We then describe how the security architecture of UMTS is used to support content protection and key distribution for MBMS groups. We evaluate the prospects of MBMS by comparing it first with IP multicast and then with DVB‐H, considered by many to be the closest competitor of MBMS. Finally, we conclude with a discussion of the technical and business challenges still faced by MBMS. Copyright © 2006 John Wiley & Sons, Ltd.     

Cost optimization of MBSFN and PTM transmissions for reliable multicasting in LTE networks

Long Term Evolution (LTE) systems have been specified and designed to accommodate small, high performance, power-efficient, end-user devices. The evolved Multimedia Broadcast/Multicast Service (e-MBMS) feature is introduced by the 3rd Generation Partnership Project (3GPP) as a complement to the existing MBMS service in order to accommodate multicast groups that are interested in receiving the same data. MBMS service is provided by MBMS over a Single Frequency Network (MBSFN) and/or Point-To-Multipoint (PTM) transmission methods. One of the challenges of MBMS is the complete error recovery of the transmitted files, a matter of great importance since the distribution of binary data must result in 100% error-free download. To fulfill this tight requirement, Forward Error Correction (FEC) mechanism has been proposed by 3GPP. In this work, we investigate the reliable multicasting by introducing a transmission method that combines the advantages of MBSFN and PTM transmission methods. We compare several FEC-based file recovery methods and evaluate them against various network parameters in a realistic simulation environment. The comparison is based on a cost-oriented analysis of MBMS service that takes into account the transmission cost over all the interfaces and nodes of the LTE architecture. The simulation results are performed with the aid of a new simulation tool and show that the performance of the file repair schemes depend on the network configuration.     

TD-MBMS关键技术及UTN组网试验分析

本文介绍了TD-SCDMA系统的中MBMS技术,深刻描述了MBMS的总体架构和关键技术,对MBMS的组网技术进行了分析;通过在外场的组网测试对UTN宏分集进行了测试和验证,并对测试数据给出对比分析以及得出初步测试结论,最后对MBMS业务应进行了展望。     

An improved mechanism for multiple MBMS sessions assignment in B3G cellular networks

In Universal Mobile Telecommunication System (UMTS), the downlink capacity is limited by the base station transmission power. Therefore, power control plays an important role to minimize the transmitted power shared among unicast and multicast users within a cell. In Multimedia Broadcast/Multicast Service (MBMS), power control targets to the efficient utilization of radio and network resources. However, the expected high demand for such services stresses the need for an efficient scheme, capable of dynamically allocating radio resources to parallel MBMS sessions. This paper proposes a power control mechanism for efficient MBMS session assignment in next generation UMTS networks. The mechanism shares efficiently the available power resources of UMTS base stations to MBMS sessions running in the network. Furthermore, the mechanism is evaluated through several realistic scenarios and the results indicate the ability of the mechanism to utilize efficiently the radio resources and to ensure the service continuity when parallel MBMS services run in the network. Our approach is compared with current 3rd Generation Partnership Project (3GPP) approaches, such as these presented in TS 25.346 and in TR 25.922, in order to highlight the enhancements that it provides.     

基于TD-SCDMA的MBMS技术的研究

本文介绍了基于TD-SCDMA系统的MBMS技术现状与发展,对MBMS技术进行了总体介绍,针对基于3GPP MBMS组网方面的主要演进方式SFN(单频网)技术进行了重点的介绍并给出了一定深度的探讨,展望了SFN的一种改进技术,TD-SCDMA MBMS(TD-MBMS)的UTN(同时隙网)技术.本文的主要目的是强调MBMS技术在未来发展和商用中的重要性,基于TD-SCDMA的MBMS技术在物理层上的最主要发展MBSFN技术在实现过程中的改进方法和发展.证明了SFN组网技术在提高频谱效率,减少信令的开销等方面有明显的优势,在SFN技术基础上发展起来的UTN和SFN组网结合的方法的高效性和灵活性.