Mobile video communications in wireless environments

Abstract

A novel system providing effective and efficient access t o video archives for mobile users communicating over low bandwidth error-prone wireless links is proposed. T h e developed system has three components: First, the middleware, implemented as mobile proxy server located a t the mobile support station, is chosen for the seamless integration of both mobile users and video servers by hiding the specific details of the underlying system. Second, for efficient video transmission, our three-dimensional significant-linked connected component analysis video codec well suited for wireless environments, is used. Finally, multilayer transmission error control mechanism is applied to cope with channel errors. As a result, no additional requirements are imposed on the mobile client and video server so that mobile users interact with the server i n exactly the same way as stationary users, and all they experience are better picture qualit,y, less jerky video, and shorter delays.

Cost-Based Cache Replacement and Server Selection for Multimedia Proxy Across Wireless Internet

“…Therefore, the redundant video object in the computation cache also has video-quality revenue. Given a redundant video object , we define the video-quality revenue rate (2) Given the population of wireless client among all clients, can be wireless (3) where wireless indicates the proportion of the wireless clients to all clients. Note that video-quality revenue rate represents how much contribution each video object provides for end clients, either 1 [Online] Available at: http://www.xycoon.com/lsmodelperformance.htm for cached objects or noncached objects.…”

“…The work of L. Gao was supported in part by National Science Foundation (NSF) CAREER Award Grant ANI-0196039. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Tak [2], [3]. Considering the inherent unreliability of the wireless channel that results from fading or shadowing effects, it is essential to adopt efficient error control scheme to cope with errors in wireless channel.…”

MobileCache: an efficient proxy cache mechanism for cell-based wireless multimedia streaming

“…There is little work in literature directed specifically to wireless proxy. Most of the existing wireless proxy schemes are designed as a rate control module for streaming relay 6 or as a transcoder to perform format conversion 7,8 . It is known that the key to effective proxy caching is the performance of the replacement policy.…”

Adaptive and integrated video communications for wireless ATM in WCDMA systems

“…More specifically, source coding, channel coding, packetization and RAKE receiver are jointly implemented as part of the application. For source coding, we propose to use three-dimensional significancelinked connected component analysis (3D-SLCCA) video codec [3] [4]. [4] only put the method to fading channels, but there isn't any method to combat fading.…”

“…For source coding, we propose to use three-dimensional significancelinked connected component analysis (3D-SLCCA) video codec [3] [4]. [4] only put the method to fading channels, but there isn't any method to combat fading. For channel coding, we used Turbo coding.…”