Service differentiation and fairness in IEEE 802.11 DCF

The DCF (distributed coordination function) access method of IEEE 802.11 standard cannot support QoS (quality of service) for real-time traffics. Knowing that the use of multimedia applications over WLANs is increasing, it seems essential to overcome this problem. There are many methods to enable DCF with service differentiation and QoS. The difficulty in majority of these methods is unfair bandwidth allocation among low and high priority traffics at high loads, resulting starvation in low priority traffics. In this paper we employ a scheme to enable 802.11 with service differentiation which grants dynamic priority to low priority traffics to prevent from starvation in theme especially in high load. The results of our simulations show that the starvation in proposed method is less than in DCF access method.

[1]  P. Krishnamurthy,et al.  Starvation prevention and quality of service in wireless LANs , 2002, The 5th International Symposium on Wireless Personal Multimedia Communications.

[2]  Xiang Chen,et al.  A QoS-enabled MAC architecture for prioritized service in IEEE 802.11 WLANs , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[3]  Thierry Turletti,et al.  Adaptive EDCF: enhanced service differentiation for IEEE 802.11 wireless ad-hoc networks , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[4]  Paramvir Bahl,et al.  Distributed fair scheduling in a wireless LAN , 2000, IEEE Transactions on Mobile Computing.

[5]  Imrich Chlamtac,et al.  A survey of quality of service in IEEE 802.11 networks , 2004, IEEE Wirel. Commun..

[6]  Yuguang Fang,et al.  Design of MAC protocols with fast collision resolution for wireless local area networks , 2004, IEEE Transactions on Wireless Communications.

[7]  Ruay-Shiung Chang,et al.  A Priority Scheme for IEEE 802. 11 DCF Access Method , 1999 .

[8]  Thierry Turletti,et al.  Adaptive fair channel allocation for QoS enhancement in IEEE 802.11 wireless LANs , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[9]  Thierry Turletti,et al.  A survey of QoS enhancements for IEEE 802.11 wireless LAN , 2004, Wirel. Commun. Mob. Comput..