Efficient mobile video access in wireless environments

Abstract

A novel middleware-based system providing effective and efficient video access for mobile users communicating over low bandwidth error-prone wireless links is proposed. The middleware, implemented as mobile proxy server located at the mobile support station, is chosen for the seamless integration of mobile users and video servers by hiding the specific details of the underlying system. For efficient video transmission, our threedimensional significant-linked connected component analysis video codec well suited for wireless environments, is used. To cope with wireless transmission errors, we propose multilayer error control mechanism, which incorporates synchronization, unequal forward error protection, and retransmission. As a result, mobile users experience better picture quality, less jerky video, and shorter delays when accessing video files. 0-7803-5668-3/99/$10.00 0 1999 IEEE.

Network-hosted avatar: User-terminal virtualization in the network

“…The streaming virtual client resident in the network-hosted avatar interfaces with external streaming servers and hides the discontinuity of delivery to streaming protocols such as Real Time Transport Protocol (RTP), Real Time Transport Control Protocol (RTCP), and Real Time Streaming Protocol (RTSP) acting as a proxy, as described in [13,18,19]. Content delivery is managed by the optimal DL delivery system, which has been designed for multi-user multicell environments.…”

Reconfiguration-based QoS management in multimedia streaming applications

“…Reconfiguration is not taken into account. This approach has been followed in many application-level proxy architectures such as [11,24,9,22,14]. An intermediate proxy is used to perform additional treatments on multimedia streams such as data transformations, protocol conversions, data transcoding, etc.…”

Adaptive Media Streaming Using Self-reconfigurable Proxies

“…Network-based solution has demonstrated the potential benefits of using the processing power available on the data path to perform adaptation tasks. This advantage has motivated numerous works such as [8,20,10,18,12]. Although these proposals have considered some heterogeneity problems, they have addressed specific class of adaptation and focused on algorithms for data stream transformations, congestion control, optimizing data transcoding, etc.…”

“…One of them consists in integrating media adaptation engines inside the network in order to adapt the multimedia content according to network, hardware or software capacities [6] (called Proxy or Network-based adaptation). An adaptation process may consist in filtering multimedia streams [8], changing their transmission protocol [10], transcoding content [1] or applying spatial and temporal transformations [20] [12]. The major benefit of network-based adaptation is its non-intrusivity with respect to legacy applications, while profiting of the processing power available in the data-path.…”