A low-complexity packet classification algorithm for multiple description video streaming over IEEE802.11E networks (original) (raw)
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Real-Time Multiple Description Video Streaming over QoS-Based Wireless Networks
2007 IEEE International Conference on Image Processing, 2007
We consider the problem of robust video streaming over networks that support QoS differentiation, such as the 802.11e wireless network infrastructure. We consider the benefits obtained matching the H.264 Data Partitioning (DP) mode with such a QoS-based interface. We compare this solution with an innovative scheme which combines a Multiple Description (MD) coding framework with a QoS-based network. Results are reported using both a simple IID channel model and a more realistic wireless network, simulated using the OmNet++ network simulator.
Wireless Personal Communications, 2005
For the performance evaluation of future wireless communication systems, such as the fourth generation wireless networks, traffic traces of realistic services are needed. Multiple description coding (MDC) is gaining a lot of interest lately and is a viable solution to provide robust video services over single or multi hop wireless networks and MDC introduces more flexibility for network coding. Furthermore it has the capability to support heterogeneous terminals as they are accepted to be used in 4G wireless networks. By means of twelve well known video sequences, in different video formats, we generate the frame size traces and evaluate the multiple description coding characteristics. In addition to that we highlight the expected overhead due to the underlying RTP/UDP/IP protocol suite. As an objective quality measurement at the application layer, we investigate the video quality in dependency of lost and error-prone descriptors. This allows researcher to convert the network losses of their network models directly into video quality values. This step makes the work unique as single layer coded video streams would always need further postprocessing to retrieve the video quality.
Frame based multiple description for multimedia transmission over wireless networks
2004
In this paper, we propose a simplified Frame based Multiple Description (MD) coding system for video streams. The proposed system uses an overdetermined filter bank to generate multiple descriptions of the original video stream, and allows for exact signal reconstruction even in the presence of packet losses. Each description is coded using the recent H264 / AVC video coding standard. With no loss, the coded signal can be reconstructed by means of the dual synthesis filter bank. In the presence of packet losses, we adopt a "restoring stage" before the synthesis filter bank whose purpose is to recover of lost coefficients. This solution has limited computational complexity and does not introduce excessive delay in interactive applications. We compare the robustness and rate-distortion performance of the proposed solution with that of other MD solutions based on polyphase spatial subsampling. The experimental results show that the proposed scheme is competitive for relatively high bit-rates and loss probability.
Packetisation strategies for enhanced video transmission over wireless LANs
2004
In this paper, packetisation strategies are presented for enhanced video transmission over IEEE 802.11 Wireless LANs. Emphasis is given to robust broadcast transmissions to several handheld devices sharing the same channel and without reliance on the MAC ARQ. In order to improve the low throughput efficiency at the MAC level with small packets, the proposed schemes map several video packets (IP packets) into one single MAC frame. Moreover, corrupted MAC frames may contain error-free video packets which are then recovered. In order to support such packetisation mechanisms, the IEEE 802.11 legacy MAC needs modifications. The required modifications are presented and discussed for the case of a No ACK policy, where packets are not acknowledged and for the case of a Block ACK scheme. They can however be easily implemented in an already existing IEEE 802.11 MAC. The physical layer considered is the IEEE 802.11a/g COFDM based PHY. Simulations are presented using the H.264 video coding standard, with a NAL unit encapsulated in a RTP/UDP/IP packet. Improvements over the legacy MAC and results in terms of PSNR and NAL Error Rate are presented for different numbers of NAL units per MAC frame for fixed NAL unit length and for fixed PHY packet length. Compared to the legacy case that does not allow retrieval of error-free blocks in a MAC frame, mapping several NAL units in the MAC frame using our scheme allows a 3dB gain in PSNR at a PER of 10 −2 for the particular scenario of low bit rates broadcast transmission over handheld devices. Moreover, mapping multiple NAL units allows higher throughput.
Video over IP using standard-compatible multiple description coding: An IETF proposal
Journal of Zhejiang University SCIENCE A, 2006
Standard-compatible multiple description coding (MDC) and layered coding (LC) are efficient ways to ensure erasure resilient, scalable transmission of encoded multimedia sources via RTP, allowing a gradual degradation of the application quality with increasing packet loss rate and decreasing bandwidth/throughput on the network. In this paper we review the standard-compatible framework proposed to IETF. Alternative techniques such as robust source coding and channel coding techniques (ARQ: automatic repeat request, FEC: forward error correction) are presented; their integration into the proposed framework is also discussed. The performances of MDC and LC either coupled with channel coding or not, are summarized by reference to current literature. Typical cases and examples are illustrated.
Channel-aware robust video streaming over wireless LANs using multiple-description FGS coding
2005 International Conference on Wireless Networks, Communications and Mobile Computing, 2005
In this paper, a novel error-resilient coding technique, named multiple description scalar quantization for fine granularity scalability (MDSQ-FGS), is presented to enhance error resilience capability and to improve the temporal prediction efficiency for video coding over lossy packet networks and wireless channels. MDSQ-FGS video coding scheme based on multiple descriptions coding (MDC) with modified multiple description scalar quantization (MDSQ) and partial predictions are proposed to control drifting error without too much reduction in efficiency. We also combine the benefits of multiple stream coding and multiple path transmission to maintain best constant video quality despite packet loss when roaming in wireless LANs (WLANs). Simulation results indicate that the proposed coding system outperforms the normal MPEG-4 FGS coder for coding efficiency, and can significantly improve the quality ofstreamed video when mobile client roams in WLAN.
Traffic analysis of multiple description coding of video services over IP networks
Proc. Wireless Personal Multimedia Communications, 2004
Abstract—For the performance evaluation of future wireless com-munication systems traffic traces are needed for simulation purpose. Multiple description coding is gaining a lot of interest lately and is a viable solution to provide robust video services over unreliable wireless links. By means of twelve well known video sequences, in different video formats, we generate the frame size traces and evaluate the multiple description coding characteristics. Furthermore we investigate the video quality in dependency of lost ...
Multiple description coding for Internet video streaming
2004
We present a system for video streaming well adapted to the unpredictable and varying nature of Internet. The proposed system uses a superposition of several Multiple Description Coding (MDC) schemes, each with N = 2 descriptions, to reach rate scalability and adaptability to varying channel conditions. Each MDC (N = 2 descriptions), that we will call base MDC has a bit rate and a redundancy associated. The superposition of several base MDC results on a MDC scheme for N > 2 descriptions with different bit rates, allowing rate scalability, for different redundancies. The proposed scheme is well adapted to varying channel conditions. In the proposed method multiple descriptions are generated by the coder and downloaded in the server, leaving to the server the only task to choose sending out the right description at the right time depending of channel conditions (bandwidth and loss rate).
System Scheduling for Multi-Description Video Streaming Over Wireless Multi-Hop Networks
IEEE Transactions on Broadcasting, 2000
Providing real-time multimedia applications over wireless multi-hop networks is a challenging problem because the wireless channels are highly sensitive to delay, interference and topology changes. Multiple description coding (MDC), as a new emerging error-resilient technique, has been widely used recently in wireless video transmission. Its fundamental principle is to generate multiple correlated descriptions such that each description approximates the source