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Development of Integrated image broadcast and unicast systems for heterogeneous network environment

异构网络环境下综合图像广播和单播系统的开发

基本信息

批准号：
11555098
负责人：
SEZAKI Kaoru
金额：
$ 8.51万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Owing to the rapid advance of recent image coding technique and the performance of personal computers, the number of terminals with the ability of receiving and sending images are growing dramatically. On the contrary, broadband network is not available for every user and the network environment is very heterogeneous ranging from mere 9600 bps PDC type cellular phone to Giga bit network. The aim of this research was to tackle with various problems under such environment to efficiently transmit images.The outcomes of the research are as follows. We proposed an -innovative method for traffic balancing by the adaptive allocation of contents servers and adaptive replication of contents. We also studied the new rate control for image traffic. As for the layered image coding, we proposed very efficient hierarchical image coding techniques both for loss-less and lossy cases and fine-tuned the parameters for bit assignment for each class. Then we applied them to transparent media scaling and proposed a scheme for flexible and easy bandwidth assignment.From the viewpoint of development of network control method under heterogeneous network environment, we also focused WDM network as very high speed network and proposed an efficient yet simple path assignment algorithms. Then we showed the feasibility of real time traffic engineering with this algorithm. Although it is beyond the scope of our original research proposal, we also studied the routing constructing method of ad-hoc networks assuming the hierarchical transmission since they are. becoming realistic now as the very low speed part of die heterogeneous networks.The research term is now over, however we are still trying to integrate these specific research topics and still developing a prototype commercial system.

由于近年来图像编码技术的迅速发展和个人计算机的性能，具有接收和发送图像能力的终端的数量急剧增加。相反，宽带网络并不是对每个用户都可用的，并且网络环境是非常异构的，从仅仅9600bps的PDC型蜂窝电话到千兆比特网络。本研究的目的是解决在这种环境下的各种问题，以有效地传输图像。提出了一种基于内容服务器自适应分配和内容自适应复制的流量均衡方法。我们还研究了新的速率控制的图像流量。至于分层图像编码，我们提出了非常有效的分层图像编码技术的无损和有损的情况下，微调的参数为每个类的比特分配。然后将其应用于透明媒体缩放中，提出了一种灵活、方便的带宽分配方案，并从异构网络环境下网络控制方法发展的角度出发，针对WDM网络这一超高速网络，提出了一种高效、简单的路径分配算法。并证明了该算法用于真实的实时流量工程的可行性。虽然这超出了我们原来的研究计划的范围，我们也研究了自组织网络的路由构造方法，假设分层传输，因为他们是。作为异构网络中速度非常低的部分，现在已经成为现实。研究期已经结束，但是我们仍在努力整合这些特定的研究主题，并仍在开发一个原型商业系统。