Scheduling for constantly-evolving data broadcasting in asymmetric communication networks

Recent advances in wireless sensor networks and GPS have made constantly-evolving data a new type of data which bring a new challenge to traditional data processing methods. Data broadcasting is an effective means for data dissemination in asymmetric communication networks, such as wireless networks. In this paper, definition of the mean uncertainty ratio of data is presented and a broadcasting scheme is proposed for constantly-evolving data dissemination. Simulation results show that the scheme can reduce the uncertainty of the broadcasted constantly-evolving data effectively at the cost of minor increase in data access time, in the case of no transmission error, transmission errors present, and multiple broadcast channels. As a result it benefits the qualities of the query results based on the data.

Joint Power Control and Scheduling for Two-Cell Energy Efficient Broadcasting with Network Coding

We consider the energy minimization problem for a two-cell broadcasting system, where the focus is devising energy efficient joint power control and scheduling algorithms. To improve the retransmission efficiency, linear network coding is applied to broadcast packets. Combined with network coding, an optimal algorithm is proposed, which is based on dynamic programming. To reduce computational complexity, two sub-optimal algorithms are also proposed for large networks. Simulation results show that the proposed schemes can reduce energy consumption up to 57% compared with the traditional Automatic Repeat-reQuest (ARQ).

New mixed broadcast scheduling approach using neural networks and graph coloring in wireless sensor network

Due to the mutual interference and sharing of wireless links in TDMA wireless sensor networks, conflicts will occur when data messages are transmitting between nodes. The broadcast scheduling problem （BSP） is aimed to schedule each node in different slot of fixed length frame at least once, and the objective of BSP is to seek for the optimal feasible solution, which has the shortest length of frame slots, as well as the maximum node transmission. A two-stage mixed algorithm based on a fuzzy Hopfield neural network is proposed to solve this BSP in wireless sensor network. In the first stage, a modified sequential vertex coloring algorithm is adopted to obtain a minimal TDMA frame length. In the second stage, the fuzzy Hopfleld network is utilized to maximize the channel utilization ratio. Experimental results, obtained from the running on three benchmark graphs, show that the algorithm can achieve better performance with shorter frame length and higher channel utilizing ratio than other exiting BSP solutions.

Scheduling for Uncertain Data Broadcast in Mobile Networks

With the increasing popularity of wireless sensor network and GPS （ global positioning system）, uncertain data as a new type of data brings a new challenge for the traditional data processing methods. Data broadcast is an effective means for data dissemination in mobile networks. In this paper, the def＇mition of the mean uncertainty ratio of data is presented and a broadcasting scheme is proposed for uncertain data dissemination. Simulation results show that the scheme can reduce the uncertainty of the broadcasted uncertain data effectively at the cost of a minor increase in data access time, in the case of no transmission error and presence of transmission errors. As a result, lower uncertainty of data benefits the qualifies of the query results based on the data.

Broadcast Scheduling Strategy Based on the Priority of Real-Time Data in a Mobile Environment

Data broadcast is an important data dissemination approach in mobile environment. On broadcast channel, scalability and efficiency of data transmission are satisfied. In a mobile environment, there exists a kind of real-time database application in which both the transactions and data can have their timing constraints and priorities of different levels. In order to meet the requirement of real-time data disseminating and retrieving, a broadcast scheduling strategy HPF-ED F (Highest Priority First with Earlier Deadline and Frequency) is proposed under the BoD (Broadcast on Demand) model. Using the strategy, data items are scheduled according to their priority the transaction imposed on them or system set for them. The strategy also considers other characteristics of data items such as deadline and popularity of data. The extensive simulation experiments have been conducted to evaluate the performance of the proposed algorithm. Results show that it can achieve excellent performance compared with existing strategies.

Power duality for multi-antenna OFDM system in broadcast channel with user scheduling

This paper deals with design and analysis of user scheduling and power allocation for multi-antenna OFDM systems with DPC,ZF-DPC,ZF-BF and TDMA transmit strategies.We consider the general multi-user downlink scheduling problem and power minimization with multi-user rate constraints.According to the channel state,it is shown that there is a power optimal policy which selects a subset of users in each scheduling interval.We present user selection algorithms for DPC,ZF-DPC,ZF-BF and TDMA for multi-antenna OFDM system in broadcast channels,and we also present the practical water-filling solution in this paper.By the selected users with the consideration of fairness,we derive the power optimization algorithm with multi-user rate constraints.We also analyze the power duality of uplink-downlink for the transmit strategies of DPC,ZF-DPC and ZF-BF.Simulation results show that the present user-scheduling algorithm and power minimization algorithm can achieve good power performance,and that the scheduling algorithm can guarantee fairness.

广播总控矩阵调度监控系统的设计方案研究

总控矩阵作为广播电视台信号实时调度的关键系统,在融媒体信息汇聚、分发、共享等信息交互环节发挥了重要作用。为了更好地满足融媒体信息传播的实际需求,提出一种新的广播总控矩阵调度监控系统的设计方案,对传统音视频类广播总控系统进行了智能化升级,以更好地满足4K/8K高清视频信号传播的需要。

基于SDN的广播IP音频信号调度系统设计

随着媒体传播方式的转变,广播电视中心正向融媒体转型,节目制作和发布越来越依赖互联网流媒体信号。传统广播信号调度系统已无法满足网际互连协议(Internet Protocol,IP)化制播的需求。基于此,设计基于软件定义网络(Software Defined Network,SDN)的广播IP音频信号调度系统,分析其优势、架构及未来发展方向。

柳州市融媒体中心高清硬盘播出系统改造方案

近年来,随着高清技术快速发展,各级电视台纷纷加快推进播出系统向高清化转型的步伐。柳州市融媒体中心积极响应这一趋势,致力于自办频道高清化改造工作,通过采用高清技术对整个播出系统进行了设计,并根据实际情况对播出系统进行高标清同播改造。对此,介绍柳州市融媒体中心三频道高清硬盘播出系统总体架构、各个组成部分以及系统建设的亮点。

基于NFV的电视云播控系统资源调度技术应用分析

随着互联网技术在传统电视行业中的广泛应用,电视播出模式正从专网独立制播向网际网融合的电视云制播转变,网络功能虚拟化(Network Functions Virtualization,NFV)技术为电视播出系统提供了重要的技术进化路径。首先介绍了NFV的相关概念以及NFV架构中的关键技术组件,分析了传统电视播控系统存在的资源调度问题,然后提出基于NFV的电视云播控系统框架,讨论了虚拟化资源池的实现方法和资源调度的关键算法。

广电移动直播指挥调度集群系统的设计

本文基于某广电集团云计算平台开发的广电移动直播指挥调度集群系统进行研究。该系统结合电信运营商公共平台调度系统,以手机为终端,优化传统无线调度系统内容,充分利用传统无线调度网络和移动承载网的技术优势,构建起一套一体化的指挥调度系统。这套适用于广播电视行业长距离移动直播指挥调度,其具有使用成本低、通信信号优质等特点,是具有较强实战指导作用的大型户外直播指挥调度系统。

Improved Delay Priority Resource Scheduling with Low Packet Loss Rate for MBMS in LTE Systems

An improved delay priority resource scheduling algorithm with low packet loss rate for multimedia broadcast multicast service(MBMS)in long term evolution(LTE)systems is proposed in this paper.Real-time services in LTE systems require lower delay and packet loss rate.However,it is difficult to meet the QoS requirements of real-time services using the current MBMS resource scheduling algorithm.The proposed algorithm in this paper jointly considers user delay information and real-time channel conditions.By introducing the user delay information,the lower delay and fairness of users are guaranteed.Meanwhile,by considering the channel conditions of users,the packet loss rate can be effectively reduced,improving the system throughput.Simulation results show that under the premise of ensuring the delay requirements of real-time services,the proposed algorithm achieves a lower packet loss rate compared to other existing algorithms.Furthermore,it can achieve a good balance between system throughput and user fairness.

Efficient Broadcast Retransmission Based on Network Coding for InterPlaNetary Internet

In traditional wireless broadcast networks,a corrupted packet must be retransmitted even if it has been lost by only one receiver.Obviously,this is not bandwidth-efficient for the receivers that already hold the retransmitted packet.Therefore,it is important to develop a method to realise efficient broadcast transmission.Network coding is a promising technique in this scenario.However,none of the proposed schemes achieves both high transmission efficiency and low computational complexity simultaneously so far.To address this problem,a novel Efficient Opportunistic Network Coding Retransmission(EONCR)scheme is proposed in this paper.This scheme employs a new packet scheduling algorithm which uses a Packet Distribution Matrix(PDM)directly to select the coded packets.The analysis and simulation results indicate that transmission efficiency of EONCR is over 0.1,more than the schemes proposed previously in some simulation conditions,and the computational overhead is reduced substantially.Hence,it has great application prospects in wireless broadcast networks,especially energyand bandwidth-limited systems such as satellite broadcast systems and Planetary Networks(PNs).

Joint Dirty Paper Coding and Linear Receiver Design for Multiuser MIMO Broadcast Channels

A multiuser multiple input multiple output (MIMO) broadcast scheme was proposed through applying dirty paper coding (DPC) at the transmitter and linear equalization at the receiver. Assuming single data stream communication for each user, joint transmitter and linear receiver design were done to enhance the system performance. Furthermore, a multiuser scheduling algorithm was presented to exploit multiuser diversity when the number of the users is larger than that of transmit antennas. The proposed system achieves the sum rate close to the Sato bound and is superior to some of the existing schemes.

Spectrum-Efficient and Fair Resource Scheduling for MBMS in LTE Systems

An improved spectrum-efficient and fair resource scheduling algorithm for multimedia broadcast multicast service(MBMS)in long term evolution(LTE)systems is proposed in this paper.By jointly considering the channel conditions of all the users,the average packet loss rate,and the fairness of users in the MBMS group,the transmission data rate of the MBMS group is first selected according to the link adaptation and the average packet loss rate of users.Then,the resource blocks are allocated to MBMS groups according to the scheduling priority.Such a resource scheduling algorithm further balances the system throughput and user fairness.Theoretical analysis and simulation results show that the proposed algorithm can achieve a good tradeoff between system throughput and user fairness in comparison with traditional scheduling algorithms.

基于元数据管理的气象数据广播精细化监控

作为气象数据和产品分发的主要渠道,中国气象局气象资料卫星数据广播系统为国内超过2400个各级气象部门、亚太地区气象用户及其他行业用户提供气象观测资料和气象服务产品。由于广播的气象数据种类众多,数据属性不一等特点,导致对气象数据的精细化监控力度不足。为解决上述问题,提出一种基于元数据管理的气象数据精细化监控方法。在建立气象广播资料元数据的基础上,针对重点气象资料进行数据播发规律研究,采用正则表达式、监控时间窗等指标进行判别计算,实现文件级广播监控,从而提升系统综合监控能力,建设完成中国气象局卫星广播精细化监控系统并投入使用。实践证明,精细化监控系统能够满足卫星广播的精细化监控需求,具有可扩展性与可维护性,保障广播系统的正常运行。

基于栏目状态进行播出调度的硬盘播出系统

根据硬盘播出系统在平度广播电视台的应用,探讨分析硬盘播出系统在实际使用时存在的问题和不足。为提高效率,保障新闻类节目的快速制作及准时播出,提出基于栏目状态进行调度的硬盘播出系统。新改进的系统充分发挥了硬盘播出系统的能力和潜力,既可帮客户有效节省设备资源,又可节省节目制作成本,同时也可大幅减少节目播出过程中的人工干预,减轻节目播出人员的值机压力,保障安全播出。

项目进度管理在广播电视监测系统建设中的应用

陕西省省级广播电视监测系统作为保障节目安全播出和提升节目播出质量的有力监测工具,是广播电视监测监管体系的核心部分,保障着陕西省广播电视安全播出,因此项目的进度就显得尤为重要。通过使用项目进度管理的方法和软件,结合陕西省省级广播电视监测系统建设实践,从规划进度管理、定义与排序、估算活动资源和持续时间、制定进度计划和控制项目进度等方面入手,制定项目里程碑清单以及项目进度甘特图。分析项目实施结果,制定合理的项目进度管理计划可以大大缩短工期,保障陕西省省级广播电视监测系统建设的时效性,为广播电视领域其他系统的建设提供参考。

广州广播电视台电视发射台信号源系统改造项目

为保障广州广播电视台电视发射台的安全播出,同时提高原信号源系统的利用率,结合广州广播电视台电视发射台信号源系统的实际情况,提出电视发射台信号源系统的建设思路和改造方案,提高了系统的稳定性和可靠性。

非对称网络环境中数据广播的启发式多盘调度算法

在以无线网络为代表的非对称网络环境中，数据广播是一种有效的数据访问方式．针对非均匀的访问概率分布，我们分析了数据广播访问时间的最优值，并提出了一种启发式多盘调度算法（ＨＭＤ），该算法能够根据给定的数据项访问概率分布，自动生成广播调度．我们的理论分析和实验结果表明，ＨＭＤ算法是一种高效的数据广播调度算法，具有接近于理论最优值的性能。