Abstract
One of the challenges that must be overcome to realize the practical benefits of ad hoc networks is quality of service (QoS). However, the IEEE 802.11 standard, which undeniably is the most widespread wireless technology of choice for WLANs and ad hoc networks, does not address this issue. In order to support applications with QoS requirements, the upcoming IEEE 802.11e standard enhances the original IEEE 802.11 MAC protocol by introducing a new coordination function which has both contention-based and contention-free medium access methods. In this paper, we consider the contention-based medium access method, the EDCA, and propose an extension to it such that it can be used to provide QoS guarantees in WLANs operating in ad hoc mode. Our solution is fully distributed, uses admission control to regulate the usage of resources and gives stations with high-priority traffic streams an opportunity to reserve time for collision-free access to the medium.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
ANSI/IEEE Std 802.11, Part11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, 1999.
IEEE P802.11e/D10.0, Part11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications: Amendment 7: Medium Access Control (MAC) Quality of Service (QoS) Enhancements, September 2004.
A. Shepard: Hybrid Change Makes WLAN QoS Come to Life. http://www.us.designreuse.com/articles/article7742.html, April 2004.
I. Hwang and C. Wang, Improving the QoS Performance of EDCA in IEEE 802.11e WLANs Using Fuzzy Set Theory, Active Networking Workshop. 2004.
D. Skyrianoglou, N. Passas and A. Salkintzis, Traffic Scheduling in IEEE 802.11e Networks Based on Actual Requirements, Mobile Venue '04 Mobile Location Workshop Athens, May 2004.
A. Grilo, M. Macedo and M. Nunes, A Scheduling Algorithm for QoS Support in IEEE 802.11e Networks. IEEE Wireless Communications Magazine, June 2003, pp. 36–43.
W. Pattara-Atikom and P. Krishnamurthy, Distributed Mechanisms for Quality of Service in Wireless LANs. IEEE Wireless Communications Magazine, June 2003.
A. Branchs, A. and X. Perez, Providing Throughput Guarantees in IEEE 802.11 Wireless LAN, Proc. WCNC, 2002.
A. Branchs, A. and X. Perez, Distributed Weighted Fair Queuing in IEEE 802.11 Wireless LAN, Proc. IEEE ICC, 2002.
N.H. Vaidya, P. Bahl and S. Gupta, Distributed Fair Scheduling in a Wireless LAN, Proc. ACM MOBICOM, 2000.
W. Pattara-Atikom, S. Banerjee and P. Krishnamurthy, Starvation Prevention and Quality of Service in Wireless LANs, Proc. IEEE WPMC, 2002.
S.H. Shah, K. Chen and K. Nahrstedt, Dynamic Bandwidth Management in Single-Hop Ad Hoc Wireless Networks, Proc. IEEE Int'l. Conf. Pervasive Comp. and Commun., 2003.
IEEE Std 802.1 lb-1999, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-Speed Physical Layer Extension in the 2.4 GHz Band, September 2004.
S. McCanne and S. Floyd, The Network Simulator – ns-2. www.isi.edu/nsnam/ns/. K. Fall and K. Varadhan, “The ns Manual”.
M. Moreton: 802.11e patch for ns-2. http://cvs.sourceforge.net/viewcvs.py/ns2-wlanpatch/patch_802_11/
A. Muir and J.J. Garcia-Luna-Aceves, Group Allocation Multiple Access in Single-Channel Wireless LANs, Proc. Communication Networks and Distributed Systems Modeling and Simulation Conference, 1997.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hamidian, A., Körner, U. An enhancement to the IEEE 802.11e EDCA providing QoS guarantees. Telecommun Syst 31, 195–212 (2006). https://doi.org/10.1007/s11235-006-6520-z
Issue Date:
DOI: https://doi.org/10.1007/s11235-006-6520-z