Adaptive Radio Resource Allocation for Multiple Traffic OFDMA Broadband Wireless Access System

In this paper, an adaptive radio resource allocation (RRA) algorithm applying to multiple traffic OFDMA system is proposed, which distributes sub-carrier and loading bits among users according to their different QoS requirements and traffic class. By classifying and prioritizing the users based on their traffic characteristic and ensuring resource for higher priority users, the scheme decreases tremendously the outage probability of the users requiring a real time transmission without impact on the spectrum efficiency of system, as well as the outage probability of data users is not increased compared with the RRA methods published.

Authors:

• Lu Yanhui
• Zhang Lizhi
• Yin Changchuan
• Yue Guangxin

Keywords:

• OFDMA
• adaptive radio resource allocation
• QoS.

References:

[1] Hermann Rohling and Rainer Grunheid, "Performance Comparison of
Different Multiple Access Schemes for the Downlink of an OFDM
Communication System", 1997
[2] Guoqing Li and Hui Liu, "On the Optimality of the OFDMA Network",
July 15, 2004, Draft
[3] Wu Junli, Teng Yong, Yin Changchuan and Yue Guangxin, "On
Performance of Multiple Access for OFDM Transmission Technique in
Rayleigh Fading Channel", Proceedings of ICCT2003
[4] R.Berezdivin, R.Breinig, and R.Topp, "Next-generation Wireless
Communications Concepts and Technologies," IEEE Commun. Mag.,
Vol.40, pp.108-116, Mar.2002
[5] C.Y.Wong, R.S.Cheng, K.B.letaief and R.D.Murch, "Multicarrier
OFDM with Adaptive Subcarrier, Bit, and Power Allocation", IEEE
J.Select. Areas Commun., Vol. 17, No. 10, pp.1747-1758 Oct. 1999.
[6] Ying Jun Zhang, K.B.Letaief, "Multiuser Adaptive Subcarrier-and-Bit
Allocation With Adaptive Cell Selection for OFDM Systems", IEEE
Transactions on Wireless Communications, Vol.3, No.5, Sept.2004
[7] C.Y.Wong, C.Y.Tsui, R.S.Cheng, and K.B.Letaief, "A Real-time
Subcarrier Allocation Scheme for Multiple Access Downlink OFDM
Transmission," in IEEE Proc. VTC-99, vol.2, 1999, pp.1124-1128
[8] Slawomir Pietrzyk, Gerard J.M.Janssen, "Multiuser subcarrier
Allocation for QoS Provision in the OFDMA Systems", in Proc. VTC
2002, Vol.2, 2002, pp.1077-1081 Fall.
[9] M.Ergen, S.Coleri, and P.Varaiya, "QoS Aware Adaptive Resource
Allocation Techniques for Fair Scheduling in OFDMA Based
Broadband Wireless Access Systems"
[10] Zukang Shen, "Multiuser OFDM Capacity Analysis with Partial Channel
Information", Multiuser Wireless Communications Course Project, Fall
2002
[11] D.G. Luenberger, Optimization by Vector Space Methods, New York:
Wiley, 1969.
[12] J.G. Proakis, Digital Communication, 3rd ed. New York: McGraw-Hill,
1995.
[13] T.S. Rappaport, Wireless Communications Principles and Practice,
Englewood Cliffs, NJ: Prentice-Hall, 1996.
[14] Kong Jian, Liu Fang, Wang Wen-bo, Liu Yuan-an, "Loading Schemes
for Downlink OFDMA System," The Journal of China Universities of
Posts and Telecommunications, Vol.11, No.4, pp.86-90, Dec.2004.
[15] Zhou Wenan, Li Zhen, Zhuge Qing, Song Junde, "An Optimal Bit
Loading Algorithm in Multi-cell Multi-user OFDM Systems," The
Journal of China Universities of Posts and Telecommunications, Vol.27
Sup., pp.212-216, Dec.2004.