Mecanismo de Difusão de Padrões de Interferência para o Aumento da Capacidade de Redes Ad Hoc IEEE 802.11
Resumo
Este artigo apresenta um método eficiente para a difusão do padrão de interferência recebida por um terminal de uma rede sem fio ad hoc IEEE 802.11. As informações difundidas podem ser utilizadas por terminais vizinhos para ajuste de parâmetros de transmissão, visando ao aumento do reuso espacial. Foram realizadas simulações do funcionamento de redes ad hoc, nas quais a intensidade da interferência produzida por comunicações próximas é monitorada em um conjunto de terminais. Os resultados demonstram que a variação da interferência no tempo, sob certas condições, corresponde a transições entre valores pertencentes a um conjunto finito, com a adição de uma série de resíduos. O método proposto consiste basicamente em difundir o padrão de interferência recebido por meio da divulgação periódica desse conjunto de valores e das respectivas frequências relativas. Desta forma, é possível transmitir aos terminais vizinhos uma descrição sumária da interferência sofrida pelo terminal de interesse, sem a necessidade do envio de toda a série temporal coletada, minimizando a sobrecarga necessária.Referências
802.11. IEEE 802.11, 1999 Edition (ISO/IEC 8802-11: 1999). IEEE Standards for Information Technology – Telecommunications and Information Exchange between Systems – Local and Metropolitan Area Network – Specific Requirements – Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, 1999.
802.11g. IEEE 802.11g-2003 IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications - Amendment 4: Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band.
Akyildiz, I. F., Lee, W.-Y., Vuran, M. C., and Mohanty, S. (2006). NeXt Generation/Dynamic Spectrum Access/Cognitive Radio Wireless Networks: A Survey. Computer Networks, 50(13):2127 – 2159.
ARC (2007). Additions to the NS network simulator to handle Ricean and Rayleigh fading. Acessado em: 15/06/2009.
Fonseca, B. J. B. (2007). A Distributed Procedure for Carrier Sensing Threshold Adaptation in CSMA-based Mobile Ad Hoc Networks. In IEEE Vehicular Technology Conference, pages 66–70.
Frangoudis, P. A. and Polyzos, G. C. (2008). Coupling QoS provision with interference reporting in WLAN sharing communities. In Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008.
Fu, L., Liew, S. C., and Huang, J. (2009). Safe Carrier Sensing Range in CSMA Network under Physical Interference Model. Technical report, Department of Information Engineering - The Chinese University of Hong Kong.
J. Fuemmeler, N. H. Vaidya, V. V. V. (2004). Selecting transmit powers and carrier sense thresholds for CSMA protocols. Technical report, University of Illinois at Urbana-Champaign.
Kim, T.-S., Lim, H., and Hou, J. C. (2006). Improving spatial reuse through tuning transmit power, carrier sense threshold, and data rate in multihop wireless networks. In ACM MOBICOM.
Liu, Y., Zhang, X., Liu, Q., and Dai, S. (2008). Interference-aware physical carrier sensing for maximum throughput in ad hoc networks. In Communications and Networking in China, pages 60–64.
NS-2 (2009). The Network Simulator - ns-2. Acessado em: 24/05/2009.
Vasan, A., Ramjee, R., and Woo, T. (2005). ECHOS - enhanced capacity 802.11 hotspots. In IEEE INFOCOM, pages 1562–1572.
Yang, X. and Vaidya, N. H. (2005). On physical carrier sense in wireless ad hoc networks. In IEEE INFOCOM.
Yang, Y., Hou, J. C., and Kung, L.-C. (2007a). Modeling of Physical Carrier Sense in Multi-hop Wireless Networks and Its Use in Joint Power Control and Carrier Sense Adjustment. In IEEE INFOCOM.
Yang, Y., Hou, J. C., and Kung, L.-C. (2007b). Modeling the Effect of Transmit Power and Physical Carrier Sense in Multi-hop Wireless Networks. In IEEE INFOCOM.
Zhai, H. and Fang, Y. (2006). Physical carrier sensing and spatial reuse in multirate and multihop wireless ad hoc networks. In IEEE INFOCOM.
Zhu, J., Guo, X., Yang, L. L., and Conner, W. S. (2004). Leveraging spatial reuse in 802.11 mesh networks with enhanced physical carrier sensing. In IEEE ICC.
Zografos, D. I. (2009). Spectrum Sensing and Reporting in WLANs. Master’s thesis, Department of Informatics - Athens University.
802.11g. IEEE 802.11g-2003 IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications - Amendment 4: Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band.
Akyildiz, I. F., Lee, W.-Y., Vuran, M. C., and Mohanty, S. (2006). NeXt Generation/Dynamic Spectrum Access/Cognitive Radio Wireless Networks: A Survey. Computer Networks, 50(13):2127 – 2159.
ARC (2007). Additions to the NS network simulator to handle Ricean and Rayleigh fading. Acessado em: 15/06/2009.
Fonseca, B. J. B. (2007). A Distributed Procedure for Carrier Sensing Threshold Adaptation in CSMA-based Mobile Ad Hoc Networks. In IEEE Vehicular Technology Conference, pages 66–70.
Frangoudis, P. A. and Polyzos, G. C. (2008). Coupling QoS provision with interference reporting in WLAN sharing communities. In Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008.
Fu, L., Liew, S. C., and Huang, J. (2009). Safe Carrier Sensing Range in CSMA Network under Physical Interference Model. Technical report, Department of Information Engineering - The Chinese University of Hong Kong.
J. Fuemmeler, N. H. Vaidya, V. V. V. (2004). Selecting transmit powers and carrier sense thresholds for CSMA protocols. Technical report, University of Illinois at Urbana-Champaign.
Kim, T.-S., Lim, H., and Hou, J. C. (2006). Improving spatial reuse through tuning transmit power, carrier sense threshold, and data rate in multihop wireless networks. In ACM MOBICOM.
Liu, Y., Zhang, X., Liu, Q., and Dai, S. (2008). Interference-aware physical carrier sensing for maximum throughput in ad hoc networks. In Communications and Networking in China, pages 60–64.
NS-2 (2009). The Network Simulator - ns-2. Acessado em: 24/05/2009.
Vasan, A., Ramjee, R., and Woo, T. (2005). ECHOS - enhanced capacity 802.11 hotspots. In IEEE INFOCOM, pages 1562–1572.
Yang, X. and Vaidya, N. H. (2005). On physical carrier sense in wireless ad hoc networks. In IEEE INFOCOM.
Yang, Y., Hou, J. C., and Kung, L.-C. (2007a). Modeling of Physical Carrier Sense in Multi-hop Wireless Networks and Its Use in Joint Power Control and Carrier Sense Adjustment. In IEEE INFOCOM.
Yang, Y., Hou, J. C., and Kung, L.-C. (2007b). Modeling the Effect of Transmit Power and Physical Carrier Sense in Multi-hop Wireless Networks. In IEEE INFOCOM.
Zhai, H. and Fang, Y. (2006). Physical carrier sensing and spatial reuse in multirate and multihop wireless ad hoc networks. In IEEE INFOCOM.
Zhu, J., Guo, X., Yang, L. L., and Conner, W. S. (2004). Leveraging spatial reuse in 802.11 mesh networks with enhanced physical carrier sensing. In IEEE ICC.
Zografos, D. I. (2009). Spectrum Sensing and Reporting in WLANs. Master’s thesis, Department of Informatics - Athens University.
Publicado
20/07/2010
Como Citar
PIRES, Alexandre Andrade; REZENDE, José Ferreira de.
Mecanismo de Difusão de Padrões de Interferência para o Aumento da Capacidade de Redes Ad Hoc IEEE 802.11. In: WORKSHOP EM DESEMPENHO DE SISTEMAS COMPUTACIONAIS E DE COMUNICAÇÃO (WPERFORMANCE), 9. , 2010, Belo Horizonte/MG.
Anais [...].
Porto Alegre: Sociedade Brasileira de Computação,
2010
.
p. 1859-1872.
ISSN 2595-6167.
