Open Access Open Access  Restricted Access Subscription or Fee Access

New Technique to Enhance Quality of Service Support for Real Time Applications in EDCA Protocol

Ahmed Abu-Khadrah(1*), Zahriladha Zakaria(2), Mohd Azlishah Othman(3)

(1) Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, Malaysia
(2) Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, Malaysia
(3) Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, Malaysia
(*) Corresponding author


DOI: https://doi.org/10.15866/irecos.v9i3.382

Abstract


Distributed Coordination Function (DCF) and Enhance Distributed Channel Access (EDCA) are two protocols which are used in Medium Access Control (MAC) layer. DCF sends its data without any differentiation between various data types. Real time application data such as voice or video do not have any preference to service it first. However the data with EDCA protocol are divided into four categories with different priorities. The voice category takes the highest priority, and then followed by video, best effort and background respectively. Specific EDCA parameters are used in each category. When using EDCA protocol, there is probability that the backoff time of two or more categories reach zero at the same time causing internal collision. Increasing the number of collisions will affect the Quality of Service (QOS) parameters requirement and decrease the throughput of the network. In this paper, the OPNET simulation is used to present some limitations in EDCA protocol with increasing the number of Voice Over Internet Protocol (VOIP) users and using default values of EDCA parameters. In addition to that, this paper proposed new technique to enhance EDCA protocol by adjusting contention window (CW) depending on the work load. Our technique will make EDCA protocol tolerates more VOIP users with achieving the QOS requirements. It will also decrease the collisions inside the network and increase the throughput.
Copyright © 2014 Praise Worthy Prize - All rights reserved.

Keywords


DCF; EDCA; QOS

Full Text:

PDF


References


R. Moraes, P. Portugal, F. Vasques, J. A. Fonseca, Limitations of the IEEE 802 . 11e EDCA Protocol when Supporting Real-Time Communication, IEEE International Workshop on Factory Communication Systems, pp. 119–128, 2008.
http://dx.doi.org/10.1109/wfcs.2008.4638712

J. Fitzpatrick, S. Murphy, M. Atiquzzaman, J. Murphy, Evaluation of VoIP in a Mobile Environment using an end-to-end Handoff Mechanism, IEEE 16th IST in Mobile and Wireless Communications Summit, pp. 1–5, 2007.
http://dx.doi.org/10.1109/istmwc.2007.4299284

J. D. Camp and E. W. Knightly, The IEEE 802 . 11s Extended Service Set Mesh Networking Standard, IEEE Communications Magazine, Vol.46, n. 8, pp. 120–126, 2008.
http://dx.doi.org/10.1109/mcom.2008.4597114

G. R. Hiertz, D. Denteneer, S. Max, R. Taori, J. Cardona, L. Berlemann, B. Walke, IEEE 802.11s: the WLAN mesh standard, IEEE Wireless Communications, Vol.17, n. 1, pp. 104–111, 2010.
http://dx.doi.org/10.1109/mwc.2010.5416357

J. Villalon, P. Cuenca, L. Orozco-Barbosa, Limitations and capabilities of QoS support in IEEE 802.11 WLANs, IEEE Conference on Communications, Computers and signal Processing, pp. 633–636, 2005.
http://dx.doi.org/10.1109/pacrim.2005.1517369

R. Shankar, A. T. Muthaiya, L. M. Janvier, P. Dananjayan, Quality of Service Enhancement for Converging Traffic in EDCA Based IEEE 802.11, IEEE International Conference on Process Automation, Control and Computing, pp. 1–6, 2011.
http://dx.doi.org/10.1109/pacc.2011.5978859

G. Sharma, A. Ganesh, P. Key, Performance analysis of contention based medium access control protocols, IEEE Transactions on Information Theory, Vol. 55, n. 4, pp. 1665–1682, 2009.
http://dx.doi.org/10.1109/tit.2008.2009608

R. Moraes, F. Vasques, P. Portugal, J. A. Fonseca, How to use the IEEE 802.11e EDCA Protocol when Dealing with Real-Time Communication, In 11th Brazilian Workshop on Real-Time and Embedded Systems, pp. 57–68, 2009.
http://dx.doi.org/10.1109/wfcs.2008.4638712

M. T. Koprivica, M. M. Ili, A. M. Neškovi, N. J. Neškovi, An Empirical Study of the EDCA QoS Mechanism for Voice over WLAN”, Telfor Journal, Vol. 3, n. 1, pp. 33–38, 2011.

H. T. Chern, H. T. Kuo, S. T. Chou, Enhanced distribution chnnel access- ¬ Modification of the intial & thereafter CW, IEEE International Conference on Systems and Informatics, pp. 1397–1401, 2012.
http://dx.doi.org/10.1109/icsai.2012.6223297

J. H. Zhou, L. Lei, W. K. Liu, L. B. Tao, Simulation Implementation and Performance Analysis of IEEE 802.11e EDCA Protocol, Applied Mechanics and Materials, Vol. 58, pp. 1429–1434, 2011.
http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.1429

A. Hamidian, U. Körner, An enhancement to the IEEE 802.11e EDCA providing QoS guarantees, Telecommunication Systems, Vol. 31, n. 2-3, pp. 195–212, 2006.
http://dx.doi.org/10.1007/s11235-006-6520-z

Z. Tao, S. Panwar, Throughput and delay analysis for the IEEE 802.11e enhanced distributed channel access, IEEE Transactions on Communications, Vol. 54, no. 4, pp. 596–603, 2006.
http://dx.doi.org/10.1109/tcomm.2006.873066

A. S. M. Tariq, K. Perveen, Contention Window Analysis and Proposed Algorithm for Collision Minimization of IEEE 802.11e EDCA, Proceedings of the World Congress on Engineering and Computer Science, Vol. 1, pp. 20–23, 2010.

W. Huibin, H. Yang, Z. Lili, X. Wei, A New Adaptive EDCA Approach to QoS of Wireless Communications, Wireless Engineering and Technology, Vol. 1, no. 1, pp. 1–9, 2010.
http://dx.doi.org/10.4236/wet.2010.11001

A. Dogman, R. Saatchi, S. Al-Khayatt, Improving Quality of Service in IEEE 802 . 11e Enhanced Distributed Channel Access Protocol, IEEE 8th International Symposium on Communication Systems, Networks & Digital Signal Processing, pp. 1-6, 2012.
http://dx.doi.org/10.1109/csndsp.2012.6292727

Shu'aibu, D.S., Syed-Yusof, S.K., Fisal, N., Partition-based bandwidth management for mobile WIMAX IEEE802.16e, (2010) International Review on Computers and Software (IRECOS), 5 (4), pp. 443-452.

Feng, Z., Wen, G., Gu, Y., Optimal contention window adjustment for asymmetry traffic over IEEE802.11 WLANs, (2011) International Review on Computers and Software (IRECOS), 6 (6), pp. 1145-1152.


Refbacks

  • There are currently no refbacks.



Please send any question about this web site to info@praiseworthyprize.com
Copyright © 2005-2019 Praise Worthy Prize