Achievable Bandwidth Estimation for Stations in Multi-Rate IEEE 802.11 WLAN Cells

This paper analyzes the effect of multi-rate transmissions in a CSMA wireless LAN environment. Observations in a real testbed showed that bandwidth resources (in Bytes/s) are shared fairly among all stations even though transmissions carried out at lower rates capture the medium for longer periods, which drastically reduces the overall throughput. The intrinsic concept of fairness in a CSMA scheme with multiple rates is quantified by means of a new formulation which is validated through simulations and practical measurements. The algorithm presented provides the maximum achievable bandwidth that can be offered to a given IEEE 802.11 station. Having this information has evident applications in realtime multimedia transmissions over WLANs. The algorithm was also run in commercial APs as a proof of concept, after analyzing its implementation issues.

[1]  Mark Davis,et al.  The Effects Of background Traffic on the End-To-End Delay for Video Streaming Applications over IEEE 802.11B WLAN Networks , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[2]  Ye Chen,et al.  Voice capacity evaluation of IEEE 802.11a with automatic rate selection , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[3]  Kang G. Shin,et al.  Goodput Analysis and Link Adaptation for IEEE 802.11a Wireless LANs , 2002, IEEE Trans. Mob. Comput..

[4]  Mike Y. Chen,et al.  Improved access point selection , 2006, MobiSys '06.

[5]  Martin Heusse,et al.  Performance anomaly of 802.11b , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[6]  John G. Proakis,et al.  Digital Communications , 1983 .

[7]  Periklis Chatzimisios,et al.  Influence of channel BER on IEEE 802.11 DCF , 2003 .

[8]  C. Macian,et al.  QoS Adaptation in SIP-based VoIP calls in Multi-rate IEEE 802.11 Environments , 2006, 2006 3rd International Symposium on Wireless Communication Systems.

[9]  Ashok K. Agrawala,et al.  IEEE 802.11 DCF enhancements for noisy environments , 2004, 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754).

[10]  Ilenia Tinnirello,et al.  Improving load balancing mechanisms in wireless packet networks , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[11]  Sachin Garg,et al.  Can I add a VoIP call? , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[12]  Sachin Garg,et al.  Admission control for VoIP traffic in IEEE 802.11 networks , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[13]  Mark Davis,et al.  Gauging VoIP call quality from 802.11 WLAN resource usage , 2006, 2006 International Symposium on a World of Wireless, Mobile and Multimedia Networks(WoWMoM'06).

[14]  Gianni Pasolini,et al.  Measurement based call admission control strategies in infrastructured IEEE 802.11 WLANs , 2005, 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications.

[15]  野村 祐士.  International Conference on Communications (ICC'99) , 1999 .