A New Distributed Scheduling Algorithm to Guarantee QoS Parameters for 802.11e WLAN
The existing distributed QoS mechanisms for WLAN MAC layer are only able to differentiate between various traffic streams without being able to guarantee QoS. On the other hand, most of the centralized QoS mechanisms are only able to guarantee QoS parameters for CBR traffic effectively. This paper addresses these deficiencies by proposing a new distributed QoS scheme that guarantees QoS parameters such as delay and throughput for both CBR and VBR traffics. The proposed scheme can also adapt to the various conditions of the network. To achieve this, three fields are added to the RTS/CTS frames that their combination with the previously existing duration field of RTS/CTS frames, guarantees the periodic access of a station to the channel. The performance of the proposed method has been evaluated with a specific simulator. The result are compared with IEEE 802.11e HCCA mechanism, and shown that it outperforms HCCA.
KeywordsDistribute Coordination Function Traffic Stream Beacon Frame Contention Period Channel Load
Unable to display preview. Download preview PDF.
- 1.IEEE 802.11 WG: IEEE Std 802.11-1999, Part 11: Wireless LAN MAC and physical layer specifications, Reference number ISO/IEC 8802-11:1999 (E) (1999)Google Scholar
- 2.IEEE 802.11 WG: IEEE 802.11e/D8, Wireless MAC and physical layer specifications: MAC enhancements. for QoS (2004)Google Scholar
- 3.Ansel, P., Ni, Q., Turletti, T.: FHCF: An Efficient Scheduling Scheme for IEEE 802.11e. ACM/Kluwer Journal on Mobile Networks and Applications (MONET), Special Issue on Modeling and Optimization in Wireless and Mobile Networks (2005)Google Scholar
- 4.Malli, M., Ni, Q., Turletti, T., Barakat, C.: Adaptive Fair Channel Allocation for QoS Enhancement in IEEE 802.11 Wireless LANs. In: IEEE ICC 2004 (International Conference on Communications), Paris, France (June 2004)Google Scholar
- 5.Zhao, J., Guo, Z., Zhang, Q., Zhu, W.: Distributed MAC Adaptation for WLAN QoS Diffrerentiation. IEEE GLOBECOM (2003)Google Scholar
- 6.Romdhani, L., Ni, Q., Turletti, T.: Adaptive EDCF: Enhanced Service Differentiation for IEEE 802.11 Wireless Ad Hoc Networks. In: IEEE WCNC 2003 (Wireless Communications and Networking Conference), New Orleans, Louisiana, USA, March 16-20 (2003)Google Scholar
- 7.Wong, G.W., Donaldson, R.W.: Improving the QoS Performance of EDCF in IEEE 802.11e Wireless LANs. IEEE 2003 (2003)Google Scholar
- 8.Atikon, W.P., Banerjee, S., Krishnamurthy, P.: A-DRAFT: An Adaptive QoS Mechanism to Support Absolute and Relative Throughput in 802.11 Wireless LANs. In: MSWiM 2004, Venezia, Italy, October 4-6, ACM, New York (2004)Google Scholar
- 9.Grilo, A., Macedo, M., Nunes, M.: A Scheduling Algorithm for QoS Support in IEEE802.11e Networks. IEEE Wireless Communication, 36–43 (June 2003)Google Scholar
- 10.Boggai, G., Camarda, P., Grieco, L.A., Mascolo, S.: Feedback-based bandwidth allocation with call admission control for providing delay guarantees in IEEE 802.11e networks. Computer Communications (2004)Google Scholar
- 11.Venkatakrishnan, B.A., Selvakennedy, S.: An Enhanced HCF for IEEE 802.11e Wireless Networks. In: MSWiM 2004, Venezia, Italy, October 4-6, ACM, New York (2004)Google Scholar
- 12.Soni, P.M., Chockalingam, A.: Performance analysis of UDP with energy efficient link layer on Markov fading channels. IEEE Transactions on Wireless Communications 1 (2002)Google Scholar