Improving BitTorrent's Peer Selection For Multimedia Content On-Demand Delivery

The great efficiency achieved by the BitTorrent protocol for the distribution of large amounts of data inspired its adoption to provide multimedia content on-demand delivery over the Internet. As it is not designed for this purpose, some adjustments have been proposed in order to meet the related QoS requirements like low startup delay and smooth playback continuity. Accordingly, this paper introduces a BitTorrent-like proposal named as Quota-Based Peer Selection (QBPS). This proposal is mainly based on the adaptation of the original peer-selection policy of the BitTorrent protocol. Its validation is achieved by means of simulations and competitive analysis. The final results show that QBPS outperforms other recent proposals of the literature. For instance, it achieves a throughput optimization of up to 48.0% in low-provision capacity scenarios where users are very interactive.Comment: International Journal of Computer Networks & Communications(IJCNC) Vol.7, No.6, November 201

Closest playback-point first: A new peer selection algorithm for P2P VoD systems

Peer-to-peer (P2P) based video-on-demand (VoD) streaming service has been gaining popularity recently. Unlike live streaming, a VoD peer always starts its playback from the beginning of a stored video. The playback-points of different peers, as well as the amount of video contents/pieces they cached, depend on when they join the video session, or their viewing ages. As a result, the upload bandwidth of younger peers tends to be underutilized because older peers are not interested in their cached video pieces. The collaborative piece exchange among peers is undermined due to the unbalanced supply and demand. To address this issue, a playback-point based request peer selection algorithm is proposed in this paper. Specifically, when a peer requests a particular video piece, among the set of potential providers, a request is sent to the peer that has the smallest playback-point difference with itself. We call this request peer selection algorithm closest playback-point first (CPF). With CPF, peers with similar available content can be loosely grouped together for a more balanced collaborative piece exchange. Extensive packet-level simulations show that with CPF, the video playback quality is enhanced and the VoD server load is significantly reduced. © 2011 IEEE.published_or_final_versionThe IEEE Global Telecommunications Conference (GLOBECOM 2011), Houston, TX, USA, 5-9 December 201

Analyzing Peer Selection Policies for BitTorrent Multimedia On-Demand Streaming Systems in Internet

The adaptation of the BitTorrent protocol to multimedia on-demand streaming systems essentially lies on the modification of its two core algorithms, namely the piece and the peer selection policies, respectively. Much more attention has though been given to the piece selection policy. Within this context, this article proposes three novel peer selection policies for the design of BitTorrent-like protocols targeted at that type of systems: Select Balanced Neighbour Policy (SBNP), Select Regular Neighbour Policy (SRNP), and Select Optimistic Neighbour Policy (SONP). These proposals are validated through a competitive analysis based on simulations which encompass a variety of multimedia scenarios, defined in function of important characterization parameters such as content type, content size, and client interactivity profile. Service time, number of clients served and efficiency retrieving coefficient are the performance metrics assessed in the analysis. The final results mainly show that the novel proposals constitute scalable solutions that may be considered for real project designs. Lastly, future work is included in the conclusion of this paper.Comment: 19 PAGE

A DISPERSÃO DE DADOS COMO CRITÉRIO PARA A POLÍTICA DE SELEÇÃO DE PEERS EM UMA REDE BITTORRENT PARA STREAMING SOB DEMANDA INTERATIVO

Este artigo analisa o impacto da dispersão de dados na política de seleção de peers de uma rede BitTorrent utilizada para o serviço de streaming sob demanda interativo. Para tanto, a política original de seleção de peers do protocolo BitTorrent é modificada com o intuito de priorizar aqueles peers que menos introduzem dispersão. Em seguida, através de simulações em cenários reais de distribuição de conteúdo multimídia, a qualidade de serviço do sistema é avaliada usando diferentes métricas de desempenho. Comparado ao sistema tradicional, os resultados finais permitem conjecturar que a dispersão de dados é um importante critério a ser considerado para a seleção de peers em virtude da otimização de serviço que foi possível observar. Por exemplo, houve registro de reduções de até 34% com relação ao número de pedaços perdidos pelos clientes durante sessões de transferências de dados multimídia. Ante o exposto, a principal contribuição deste artigo é a possibilidade de implementação de protocolos de streaming sob demanda mais eficientes usando o critério da dispersão de dados

Data dispersion as a criterion for the peer-selection policy in a BitTorrent network for interactive on-demand streaming network

Este artigo analisa o impacto da dispersão de dados na política de seleção de peers de uma rede BitTorrent utilizada para o serviço de streaming sob demanda interativo. Para tanto, a política original de seleção de peers do protocolo BitTorrent é modificada com o intuito de priorizar aqueles peers que menos introduzem dispersão. Em seguida, através de simulações em cenários reais de distribuição de conteúdo multimídia, a qualidade de serviço do sistema é avaliada usando diferentes métricas de desempenho. Comparado ao sistema tradicional, os resultados finais permitem conjecturar que a dispersão de dados é um importante critério a ser considerado para a seleção de peers em virtude da otimização de serviço que foi possível observar. Por exemplo, houve registro de reduções de até 34% com relação ao número de pedaços perdidos pelos clientes durante sessões de transferências de dados multimídia. Ante o exposto, a principal contribuição deste artigo é a possibilidade de implementação de protocolos de streaming sob demanda mais eficientes usando o critério da dispersão de dados.http://www.revistas.unifacs.br/index.php/rs

On the Optimization of BitTorrent-Like Protocols for Interactive On-Demand Streaming Systems

This paper proposes two novel optimized BitTorrent-like protocols for interactive multimedia streaming: the Simple Interactive Streaming Protocol (SISP) and the Exclusive Interactive Streaming Protocol (EISP). The former chiefly seeks a trade-off between playback continuity and data diversity, while the latter is mostly focused on playback continuity. To assure a thorough and up-to-date approach, related work is carefully examined and important open issues, concerning the design of BitTorrent-like algorithms, are analyzed as well. Through simulations, in a variety of near-real file replication scenarios, the novel protocols are evaluated using distinct performance metrics. Among the major findings, the final results show that the two novel proposals are efficient and, besides, focusing on playback continuity ends up being the best design concept to achieve high quality of service. Lastly, avenues for further research are included at the end of this paper as well.Comment: 20 page

On the optimization of bittorrent-like protocols for interactive on-demand streaming systems

This paper proposes two novel optimized BitTorrent-like protocols for interactive multimedia streaming: the Simple Interactive Streaming Protocol (SISP) and the Exclusive Interactive Streaming Protocol (EISP). The former chiefly seeks a trade-off between playback continuity and data diversity, while the latter is mostly focused on playback continuity. To assure a thorough and up-to-date approach, related work is carefully examined and important open issues, concerning the design of BitTorrent-like algorithms, are analyzed as well. Through simulations, in a variety of near-real file replication scenarios, the novel protocols are evaluated using distinct performance metrics. Among the major findings, the final results show that the two novel proposals are efficient and, besides, focusing on playback continuity ends up being the best design concept to achieve high quality of service. Lastly, avenues for further research are included at the end of this paper as well