基于LTE的eMBMS业务平台架构及部署

主要对eMBMS业务平台技术进行了研究,首先对eMBMS业务平台在网络中的定位及与周边网元的关系进行了梳理,就国际标准对eMBMS业务平台的定义进行了分析,在此基础上结合运营商实际需求梳理了eMBMS管理流程及主要业务场景,提出了符合国际标准及运营商自身发展的eMBMS业务平台架构,并对平台关键技术及部署方式进行了研究.     

LTE中eMBMS技术探讨

本文介绍了LTE系统的中eMBMS技术,深刻描述了eMBMS的逻辑架构,用户面协议架构和控制面协议架构,并对eMBMS的中会话开始及会话结束流程做了详细介绍,最后对MBMS进行了总结并对业务应用前景进行了展望.     

eMBMS的业务应用及商业模式研究

首先介绍了eMBMS业务概念,分析了直播业务和推送业务的具体业务应用场景,其次分析了eMBMS业务的整个产业链、收费模式、内容聚集方式、业务管理需求、业务推广策略,最终提出平台模式是业务初期的最佳商业模式,并结合内容模式的优势提出开发电信运营商统一客户端,加强电信品牌营销.     

A novel slot scheduling technique for duty-cycle based data transmission for wireless sensor network

The duty cycling process involves turning a radio into an active and dormant state for conserving energy. It is a promising approach for designing routing protocols for a resource-constrained Wireless Sensor Networks (WSNs). In the duty cycle-based WSNs, the network lifetime is improved and the network transmission is increased as compared to conventional routing protocols. In this study, the active period of the duty cycle is divided into slots that can minimize the idle listening problem. The slot scheduling technique helps determine the most efficient node that uses the active period. The proposed routing protocol uses the opportunistic concept to minimize the sender waiting problem. Therefore, the forwarder set will be selected according to the node's residual active time and energy. Further, the optimum routing path is selected to achieve the minimum forwarding delay from the source to the destination. Simulation analysis reveals that the proposed routing scheme outperforms existing schemes in terms of the average transmission delay, energy consumption, and network throughput.     

LTE eMBMS无线技术研究与关键问题分析

对基于LTE中eMBMS的业务及网络构架进行介绍,结合LTE的技术优势,重点分析eMBMS的空口技术,并对空口资源调度进行深入研究和探讨.     

eMBMS中MBSFN区域管理策略研究

采用MBSFN传输时,LTE CELL对于用户是不可见的,为实现单播与多播之间的无缝切换,确定CELL与MBMS区域间对应关系成为关键问题。针对这一问题,文章在给出MBMS区域的分类及特点的基础上,明确了MBMS区域管理的主要内容及MBSFN区域管理问题;进而基于MBSFN区域特点及管理要求,提出了MBSFN区域管理策略,给出了CELL-MA-SAMBMS配置流程以及MBSFN区域管理流程。该MBSFN区域管理策略简单高效的确定出CELL-MA-SAMBMS间对应关系,有效地保障了LTE系统中的组波及广播服务。     

eMBMS终端和业务实现方案浅析

从终端和业务实现角度出发,阐述了eMBMS系统的整体架构和技术实现框架,并对eMBMS业务中关键流程及安全机制进行了分析,是研究eMBMS业务的有益参考。     

基于eMBMS的LTE Broadcast技术及应用发展策略

随着移动互联网的快速发展,日益增长的视频业务将对移动运营商的LTE网络产生越来越大的压力。为了应对这一压力,基于eMBMS的LTE Broadcast技术逐渐得到行业的关注。本文分析了LTE Broadcast的产生背景、主要技术方案、应用场景,并对其未来的发展进行了展望。     

PTN网络承载eMBMS业务技术及网络部署方案

eMBMS业务被提上了日程,作为承载eMBMS业务的PTN回传网络同样需考虑支持多播业务。本文针对网络部署进行了分析和研究,并提出了PTN支持多播业务的技术方案。     

一种无时间标记的包调度策略

本文提出一种多队列的包调度算法，该方法在调度的公平性、延时和所需的缓冲空间等性能方面与PGPS，PRPS等调度算法有相同的性能，同时无需对各个到达的数据包记上时间标记，使调度操作更为简单有效。     

Priority based efficient data scheduling technique for VANETs

As vehicular networks are gaining popularity, large number of vehicles want to take advantage of these networks, by utilizing the information they have, in order to take decision. Vehicle receives data from other vehicles or from the road side units (RSUs) available across the road. Since RSUs act as router to connect with the external world as well as it is a high capacity storage place where important data (e.g. data used in traffic safety, location dependent query, etc.) can be stored for download purpose for other vehicles moving through the service area. Since the RSUs have limited communication range and vehicles usually moves at very high speed in the service area, they have limited time to serve data to vehicles moving in the service area. For this purpose RSUs have to schedule data in such a way that maximum vehicles can get benefit from the data available with the RSUs. There are many algorithms proposed in the past to schedule data at RSUs. This paper proposes a mechanism to schedule data of those vehicles which are in the coverage range of the RSU. The proposed algorithm outperforms to serve requests whose deadline is about to expire i.e. vehicles which have left the service area after forwarding request to RSU. This scheme performs well in dense network and has good results in highway scenario.     

一种两阶段的敏捷卫星任务并行调度技术

敏捷卫星灵巧的姿态机动能力令其观测能力和使用效率得到大幅提升,也使得卫星任务调度变得更加复杂和困难.首先,通过分析敏捷卫星的工作模式、任务调度特点和使用约束,构建了基于任务重要性、任务满足度和任务成像质量等目标的敏捷卫星任务调度优化模型;然后,通过对敏捷卫星多种成像模式进行统一编码,设计了一种新的差分变异策略——基于排名的变异算子,提出了基于主从式的改进并行差分进化算法;最后,和基于时间轴的成像质量贪心算法相结合,给出一种新的两阶段敏捷卫星观测任务调度方法,并通过仿真对比验证了方法的有效性.     

A novel scheduling scheme for multiple traffic classes

In this paper, a novel scheduling scheme is proposed for multiple traffic classes to exploit multiuser diversity of the non-real-time (NRT) traffic. The proposed scheduling algorithm consists of two stages, i.e. at the first scheduling stage, the inter-traffic scheduler dynamically allocates the bandwidth resources to each traffic class by a periodic and triggered way with the objective of maximizing a room for NRT traffic while guaranteeing the quality of service (QoS) requirements of real-time (RT) traffics; at the second scheduling stage, the intra-traffic scheduler is used to schedule different users' packets within each traffic class simultaneously. The proposed algorithm not only enhances the system throughput but also satisfies the QoS requirements of RT traffic. Simulation results validate the effectiveness and good performance of the proposed scheme.     

Grid coding: A novel technique for image processing

The encoding of information as the modulation of a grid is explored as the means for allowing the extraction of relevant details or features from images. A major aspect of this approach is the replacement of the heuristics in certain image processing tasks by simple Fourier filtering. Specific examples and particular implementations of coding schemes are described in order to show the wide applicability of the concept. The examples chosen fall in the domains of scene analysis, difference extraction from successive images, automatic extraction of range, extraction of features such as planes, recording of three-dimentional imagery, and the processing of a single coded view to give a set of stereo related pairs.     

一种新的航迹与量测互联技术

为了同时解决存在于航迹与量测互联问题中的两种不确定性：目标运动和量测源的不确定性,本文提出一种基于BP的变结构交互式多模型2-D互联技术。首先,采用全局2-D分配算法确定量测与目标的分配问题,确定量测序列;其次,提出一种元模式的概念,采用离散小波变换,将目标量测序列映射到目标模式序列,从而由BP神经网络对目标运动模型对应的概率进行估计。再利用变结构的交互式多模型进行目标滤波估计。初步实验结果表明：本文提出的技术能较好地解决密集目标、特别是机动目标的互联问题。     

WCDMA HSUPA技术中的Node B调度算法研究

HSUPA（High Speed Uplink Packet Access）是继HSDPA（High Speed Downlink Packet Access）后，WCDMA（Wideband Code Division Multiple Access）标准的又一次重要演进。阐述了HSUPA采用的三种主要技术之一的基于Node B（基站）的快速调度，讨论了HSUPA可以采用的几种分组调度算法，并对几种算法作了简要比较。     

相控阵制导雷达自适应调度技术应用

相控阵制导雷达需要在进行空域搜索、目标捕获跟踪的同时精确地导引导弹攻击来袭目标,为此需要使用基于优先级排序的雷达自适应调度技术完成各种雷达任务的调度,描述了相控阵制导雷达应用自适应调度技术的实现方法,实际应用结果表明该技术能够有效提高雷达时间资源的利用率,保证雷达整体工作效能。