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Bandwidth-allocated Rich Media Delivery Technology

In recent years, more people have been viewing such rich content as videos and high-quality images on their smartphones and tablet devices. However, combined with the explosive increase in the number of users, we will inevitably reach a bandwidth bottleneck, which will adversely affect the quality of delivered content. Fuji Xerox has thus developed a bandwidth-allocated rich media delivery technology that can optimize delivery and provide a pleasant viewing experience. This is made possible by measuring the transmission state instantaneously and sending a correspondingly optimized file, thereby allowing users to enjoy a stress-free viewing experience.


Fig. 1: Overview of bandwidth-allocated rich media delivery technology

Bandwidth has been conventionally measured by the throughputNote 1 performance achieved by transferring the maximum amount of packets that a transmission channel can accommodate at that instance via actual networks. While providing high accuracy, this method is still not an ideal way of measuring bandwidth, as measured values fluctuate significantly in actual operating environments. By utilizing the characteristics of Transmission Control Protocol (TCP), the standard Internet communication protocol, Fuji Xerox has devised a unique method of measuring bandwidth in real time by probing the transmission channel from user devices. Based on the results of measured bandwidth, optimized files are then selected and delivered to the user.
Fig. 1 explains how videos are delivered by using this technology. Video files of different bit ratesNote 2 are prepared in advance. The transmission channel is (1) probed from the user's

device to the server in order to (2) measure the bandwidth between the two in real time. According to the measured data, (3) a video file of the corresponding bit rate is selected and (4) streamed for viewers. By repeating this process, streaming will always be provided under optimum conditions, allowing users to continue watching videos without interruption. This technology can be adapted for media delivery via networks, both wired and wireless. In particular, having a relatively narrow band of frequencies and large fluctuations, mobile networks will potentially benefit more from this technology than other transmission modes.