On the Performance of Network Coding in Multi-Resolution Wireless Video Streaming

Gheorghiu, Steluta; Lima, Luísa; Toledo, Alberto Lopéz; Barros, João; Médard, Muriel

doi:10.1109/netcod.2010.5487688

Cited by 10 publications

(8 citation statements)

References 12 publications

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“…Recently, there have also been a few practical works that demonstrated the effectiveness of combining MRC video streaming with variations of the canonical triangular coding 2 scheme for multihop wireless networks [7], [8]. [7] uses the triangular coding scheme combined with ARQ and a creditbased rate control system but it assumes that each client requests the desired number of layers from the server.…”

Section: Related Workmentioning

confidence: 99%

“…[7] uses the triangular coding scheme combined with ARQ and a creditbased rate control system but it assumes that each client requests the desired number of layers from the server. In contrast, in our work, the AP automatically determines the optimal number of layers and the optimal coding strategy for any objective function.…”

Section: Related Workmentioning

confidence: 99%

“…Recent work [7], [18], [8], inspired by previous work on the classic subject of combining unequal error protection with video delivery mechanisms [21], [22], [23], have proposed and showed the effectiveness of a canonical triangular scheme. Canonical triangular schemes only consider the following L ways of coding packets from the L layers: the kth way being coding the first k layers, for k = 1, ..., L.…”

Section: Preliminaries: Triangular Coding Schemementioning

confidence: 99%

“…Recent practical work [7], [8] that studied this approach have proposed and showed the effectiveness of an even canonical triangular heuristic which essentially evenly splits the total number of transmissions (that can be sent before the deadline) among the K ways of coding the packets, with the ith way being coding packets from the first i layers.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Online WiFi Delivery of Layered-Coding Media Using Inter-layer Network Coding

Koutsonikolas

Wang

et al. 2011

2011 31st International Conference on Distributed Computing Systems

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Abstract-A primary challenge in multicasting video in a wireless LAN to multiple clients is to deal with the client diversity -clients may have different channel characteristics and hence receive different numbers of transmissions from the AP. A promising approach to overcome this problem is to combine multi-resolution (layered) video coding with interlayer network coding. The fundamental challenge in such an approach is to determine the strategy of coding the packets across different layers that maximizes the number of decoded layers at all clients. This paper makes three contributions.(1) We first show that even for one client, the previously proposed canonical triangular scheme for inter-layer network coding can perform poorly. We show how to enhance the triangular scheme by incorporating the estimated target number of layers which significantly improves its effectiveness. (2) We show that such an enhanced triangular scheme still performs poorly for multiple clients with diverse channel characteristics, which motivates the need for searching for the optimal coding strategy. The naive way of searching for the optimal strategy is computationally prohibitive. We present several optimizations that drastically reduce the complexity of exhaustively searching for the optimal strategy, making it feasible in real time. (3) Finally, we design and evaluate an online video delivery scheme, Percy, to be deployed at a proxy behind the AP of a wireless LAN. Our simulation results show that Percy outperforms the previous inter-layer coding heuristic by up to 22-80% with varying numbers of clients.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Preliminaries: Triangular Coding Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Online WiFi Delivery of Layered-Coding Media Using Inter-layer Network Coding

Koutsonikolas

Wang

et al. 2011

2011 31st International Conference on Distributed Computing Systems

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“…In the first case, users 2 are heterogeneous and have different subscription levels, thus requiring a different resolution of the content [9]. In the second case, the receivers are not able to receive the whole content due to channel fading, that can be modeled as erasures at higher layers.…”

Section: Introductionmentioning

confidence: 99%

Degraded Multicasting with Network Coding over the Combination Network

Gheorghiu

Bidokhti

Fragouli

et al. 2011

2011 International Symposium on Networking Coding

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In this paper, we give a characterization of the rate region for the degraded two message set problem, applied to a combination network with erasure channels. We also provide an algorithm that uses topological information in order to deliver the two messages to the receivers, and we show that our algorithm is optimal, in the sense that it achieves any rate pair in the region. We compare our algorithm analytically with a naive approach oblivious to the network structure, and we give an insight on what benefits should be expected for different classes of networks.

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