Hierarchical cache optimization in IPTV networks

Krogfoss, Bill; Sofman, Lev B.; Agrawal, Anshul

doi:10.1109/isbmsb.2009.5133767

Cited by 10 publications

(2 citation statements)

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“…Sofman and Krogfoss [6] indicated that a portion of the video content could be stored in caches closer to clients to reduce the IPTV traffic and further presented an analytical model of hierarchical cache optimization depending on traffic, topology, and cost parameters. A heuristic model [7] was proposed for hierarchical cache optimization in an IPTV network. Chen et al [8] presented an IPTV system based on a peer-to-peer hierarchical cache architecture.…”

Section: Introductionmentioning

confidence: 99%

Adjustable Two-Tier Cache for IPTV Based on Segmented Streaming

Liang

2012

International Journal of Digital Multimedia Broadcasting

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Internet protocol TV (IPTV) is a promising Internet killer application, which integrates video, voice, and data onto a single IP network, and offers viewers an innovative set of choices and control over their TV content. To provide high-quality IPTV services, an effective strategy is based on caching. This work proposes a segment-based two-tier caching approach, which divides each video into multiple segments to be cached. This approach also partitions the cache space into two layers, where the first layer mainly caches to-be-played segments and the second layer saves possibly played segments. As the segment access becomes frequent, the proposed approach enlarges the first layer and reduces the second layer, and vice versa. Because requested segments may not be accessed frequently, this work further designs an admission control mechanism to determine whether an incoming segment should be cached or not. The cache architecture takes forward/stop playback into account and may replace the unused segments under the interrupted playback. Finally, we conduct comprehensive simulation experiments to evaluate the performance of the proposed approach. The results show that our approach can yield higher hit ratio than previous work under various environmental parameters.

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Section: Introductionmentioning

confidence: 99%

Adjustable Two-Tier Cache for IPTV Based on Segmented Streaming

Liang

2012

International Journal of Digital Multimedia Broadcasting

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“…Designing a content distribution network (CDN) includes the dimensioning of the head-end platform, decisions regarding the placement and the connections of the cache-media servers, dimensioning of the cache-media servers themselves [5], traffic engineering to accommodate for the offered services [6], [6] and grooming the access network.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary Algorithm Optimization of Edge Delivery Sites in Next Generation Multi-service Content Distribution Networks

Stephanakis

Logothetis

2011

Engineering Applications of Neural Networks

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In the past decade or so we have been experiencing an extraordinary explosion of data volumes first in wireline networks and recently even in mobile wireless networks. Optimizing bandwidth utilization is critical for planning and deploying efficient networks that are capable of delivering new services like IPTV over cost-oriented implementations. Models of distributed content caching in the access network have been employed-for example-as analytical optimization tools in order to tackle associated problems. A modified capacitated quality-ofservice network (QoS) model is proposed herein in order to optimize the placement of the sites of surrogate media servers (central offices-COs) on the access part of a content distribution network (CDN). The novelty of the proposed approach lies in the fact that capacitated quality-of-service network optimization is cast as an optimization problem over two rather than one optimization variables-objectives. Implementation cost and link delay as determined by capacity/utilization requirements are the optimization functionals-objectives. Optimization of the network architecture is carried out via a multiobjective evolutionary algorithm that encodes all possible edges between the first level aggregation points of the access network. Proper priorities are assigned to different types of traffic according to class of service. Two main services are considered, namely live broadcast/IPTV and video on demand services (VoD). The media servers/COs are incorporated into the infrastructure of the access nodes in a step-by-step fashion modifying the traffic requirements between source and sink nodes of the optimal configurations of the access network. The evolution of the Pareto front is investigated in each case.

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