IEEE 802.11n MAC Enhancement and Performance Evaluation



The IEEE 802.11-based WiFi wireless technology is one of the most promising technologies to provide ubiquitous networking access. The IEEE 802.11 working group has always strived to improve this wireless technology through creating new amendments to the base 802.11 standard. Recently, IEEE 802.11n amendment was created to enhance 802.11 for higher throughput operation. Not only new Physical Layer enhancements are standardized, but new Medium Access Control Layer mechanism are also defined. In this paper, we examine the network performance enhancement by the proposed 802.11n MAC layer features: aggregation, block acknowledgement, and reverse direction mechanism. We implemented a new 802.11n module in the NS-2 simulation platform. The simulation results demonstrated the effectiveness of 802.11n MAC layer enhancement. VoIP performance is effectively improved with 802.11n MAC enhancement.


IEEE 802.11n performance evaluation ns-2 VoIP 



This work was supported by the National Science Council of Taiwan under Grant NSC-97-2220-E-002-012-.


  1. 1.
    Armitage GJ, Zander S (2004) Empirically measuring the QoS sensitivity of interactive online game players. In: ATNAC04: Australian Telecommunications Networks and Applications Conference, Sydney, December 2004Google Scholar
  2. 2.
    Cai LX, Ling X, Shen X, Mark JW, Cai L (2008) Supporting voice and video applications over IEEE 802.11n WLANs. Wirel Netw. doi:110.1007/s11276-007-0062-5
  3. 3.
    Cheng J, Wang H, Chen M, Cheng S (2001) Performance comparison and analysis between STTC and STBC. IEEE Veh Technol Conf 4:2487–2491Google Scholar
  4. 4.
    Chung J, Kim J, Kim T, Jo J (2004) Performance evaluation of MIMO-OFDM systems in correlated fading channels. Can Conf Electr Comput Eng 1:457–460Google Scholar
  5. 5.
    Cole RG, Rosenbluth JH (2001) Voice over IP performance monitoring. SIGCOMM Comput Commun Rev 31(2):9–24CrossRefGoogle Scholar
  6. 6.
    Foschini GJ, Gans MJ (1998) On limits of wireless communications in a fading environment when UsingMultiple antennas. Wirel Pers Commun 6(3):311–335CrossRefGoogle Scholar
  7. 7.
    Li T, Ni Q, Turletti T, Xiao Y (2005) Performance analysis of the IEEE 802.11 e block ACK scheme in a noisy channel. In: 2nd International Conference on Broadband Networks, vol 1. Boston, October, pp 511–517Google Scholar
  8. 8.
    Lin Y, Wong VWS (2006) WSN01-1: frame aggregation and optimal frame size adaptation for IEEE 802.11n WLANs. IEEE Global Telecommunications Conference, San Francisco, DecemberGoogle Scholar
  9. 9.
    Liu C, Stephens AP (2006) Delayed channel access for IEEE 802.11e based WLAN. IEEE Int Conf Commun 10:4811–4817CrossRefGoogle Scholar
  10. 10.
    Mangold S, Choi S, Hiertz GR, Klein O, Walke B (2003) Analysis of IEEE 802.11e for QoS support in wireless LANs. IEEE Wirel Commun 10(6):40–50CrossRefGoogle Scholar
  11. 11.
    McCanne S, Floyd S (2008) ns-2 network simulator.
  12. 12.
    Ozdemir M, Gu D, Mcdonald AB, Zhang J (2006) Enhancing MAC performance with a reverse direction protocol for high-capacity wireless LANs. In: IEEE 64th vehicular technology conference, Montreal, September 2006Google Scholar
  13. 13.
    Papapanagiotou I, Paschos GS, Kotsopoulos SA, Devetsikiotis M (2007) Extension and comparison of QoS-enabled Wi-Fi models in the presence of errors. In: Global telecommunications conference. Washington, DC, November, pp 2530–2535Google Scholar
  14. 14.
    Sinha R, Papadopoulos C, Heidemann J (2005) Internet packet size distributions: some observations. Technical report, OctoberGoogle Scholar
  15. 15.
    Skordoulis D, Ni Q, Chen H-H, Stephens AP, Liu C, Jamalipour A (2008) IEEE 802.11n MAC frame aggregation mechanisms for next-generation high-throughput WLANs. IEEE Wirel Commun 15(1):40–47CrossRefGoogle Scholar
  16. 16.
    Stephens A, Morioka Y, Adachi T, Akhmetov D, Shtin S (2006) TGn joint proposal MAC results, JanuaryGoogle Scholar
  17. 17.
    Wietholter S, Hoene C (2003) Design and verification of an IEEE 802.11 e EDCF simulation model in ns-2.26. Technische Universitet at Berlin, Tech. Rep. TKN-03-019, NovemberGoogle Scholar
  18. 18.
    Xiao Y (2005) IEEE 802.11n: enhancements for higher throughput in wireless LANs. IEEE Wirel Commun 12(6):82–91CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Electrical EngineeringNational Taiwan UniversityTaipeiRepublic of China

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