Impact of the clients' position on performance of VoD systems based on collocated APs

ABSTRACT

This paper investigates the impact of clients' position in scalable wireless VoD systems, based on collocated access points. In particular, it evaluates the use of several transmission modes provided by the 802.11a standard, aiming to service different area sizes, using the CINAPS (Cluster of Inexpensive Access Points) system, which was extended with a novel distance-aware association control heuristic. Overall, our simulated results showed that the clients' position influences only when the blockage rate of requests given by the other system variables is up to the uncovered area coefficient. Moreover, they suggest that an adaptive approach of transmission mode choice could achieve a slightly better average blockage rate but significantly far from the ideal values.Este artigo investiga o impacto da posição dos clientes no desempenho de sistemas de VoD sem fio escal´veis, baseados em pontos de acesso co-localizados. Em particular, é avaliado o uso de v´rios modos de transmissão do padrão 802.11a, visando atender ´reas de diferentes tamanhos, utilizando como base o sistema CINAPS (Cluster of Inexpensive Access Points), estendido com uma nova heurĩstica de controle de associação distance-aware. Os resultados mostram que o posicionamento dos clientes influencia apenas quando a taxa de bloqueio determinada pelas demais vari´veis do sistema é inferior ao coeficiente de ´rea descoberta. Além disso, eles sugerem que uma abordagem adaptativa de escolha de modo de transmissão poderia melhorar levemente a taxa de bloqueio média mas ainda distante dos valores ideais.

REFERENCES

• 1: Ivaylo Haratcherev , Jacco Taal , Koen Langendoen , Reginald Lagendijk , Henk Sips, Automatic IEEE 802.11 rate control for streaming applications: Research Articles, Wireless Communications & Mobile Computing, v.5 n.4, p.421-437, June 2005 [doi>10.1002/wcm.v5:4]
• 2: M. Heusse, F. R. G. Berger-Sabbatel, and A. Duda. Performance anomaly of 802.11b. In Proceedings of the 22th Annual Joint Conference of the IEEE Computer and Communications Societies (INFOCOM), volume 2, pages 836--843, San Francisco, USA, March-April 2003.
• 3: Gavin Holland , Nitin Vaidya , Paramvir Bahl, A rate-adaptive MAC protocol for multi-Hop wireless networks, Proceedings of the 7th annual international conference on Mobile computing and networking, p.236-251, July 2001, Rome, Italy [doi>10.1145/381677.381700]
• 4: Wireless lan medium access control and physical layer specification. ANSI/IEEE Standard 802.11, 1999.
• 5: Video Ipod. {OnLine}. Available: http://www.apple.com/ipod/ipod.html {Accessed July 28, 2006}.
• 6: E. Ishikawa and C. L. Amorim. Collapsed Cooperative Video Cache for Content Distribution Networks. In Proceedings of the 21th Brazilian Simposium on Computer Networks (SBRC), pages 249--264, Natal, Brazil, May 2003.
• 7: Kenji Hisazumi , Akira Fukuda, WiPS: Location and Motion Sensing Technique of IEEE 802.11 Devices, Proceedings of the Third International Conference on Information Technology and Applications (ICITA'05) Volume 2, p.346-349, July 04-07, 2005 [doi>10.1109/ICITA.2005.312]
• 8: M. H. Manshaei and T. Turletti. Simulation-based performance analysis of 802.11a wireless lan. In Proceedings of the International Symposium on Telecommunications (IST), pages 758--762, Isfahan, Iran, August 2003.
• 9: L. B. Pinho and C. L. Amorim. Investigating the Performance of Video-on-Demand Systems over WLANs Using Generic Association Control. In Proceedings of the 4th Latin American Network Operations and Management Symposium (LANOMS), pages 187--198, Porto Alegre, Brazil, August 2005.
• 10: Leonardo Bidese de Pinho , Claudio Luis de Amorim, Assessing the efficiency of stream reuse techniques in P2P video-on-demand systems, Journal of Network and Computer Applications, v.29 n.1, p.25-45, January 2006 [doi>10.1016/j.jnca.2004.10.009]
• 11: Leonardo Bidese de Pinho , Claudio Luis de Amorim, Efficient Support to Scalable Delivery of VoD Systems Using Collocated Access Points, Proceedings of the International Conference on Networking, International Conference on Systems and International Conference on Mobile Communications and Learning Technologies (ICNICONSMCL'06), p.107, April 23-29, 2006 [doi>10.1109/ICNICONSMCL.2006.86]
• 12: L. B. Pinho and C. L. Amorim. Otimizando o Consumo de Energia de Dispositivos Móveis em Sistemas de VoD Baseados em Pontos de Acesso Co-localizados. In Proceedings of the 24th Brazilian Symposium on Computer Networks (SBRC), volume 1, pages 621--636, Curitiba, Brazil, May 2006.
• 13: L. B. Pinho, E. Ishikawa, and C. L. Amorim. GloVE: A Distributed Environment for Scalable Video-on-Demand Systems. International Journal of High Performance Computing Applications (IJHPCA), 17(2):147--161, Summer 2003.
• 14: D. A. Tran, M. Le, and K. A. Hua. MobiVoD: A Video-on-Demand System Design for Mobile Ad Hoc Networks. In Proceedings of the 5th IEEE International Conference on Mobile Data Management (MDM), pages 212--223, Berkeley, USA, January 2004.

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.4 Distributed Systems
          Subjects: Client/server

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Wireless communication
      C.2.3 Network Operations
          Subjects: Network management
      C.2.5 Local and Wide-Area Networks
          Subjects: Access schemes

General Terms:
Design, Management