A subcarrier allocation algorithm for OFDMA using buffer and channel state information

We propose a new subcarrier allocation algo- rithm for Orthogonal Frequency Division Multiple Access (OFDMA) that gives fair allocation of capacity to multiple users with different channel and traffic characteristics. This is achieved by utilizing buffer state information and mea- sured traffic statistics in addition to channel state feedback. Multiuser diversity gains are achieved in the proposed al- gorithm by scheduling across both time (buffering) and fre- quency (subcarriers). Simulation results are shown to illus- trate (a) improved capacity allocation and throughput, and (b) larger admissible traffic when compared to the existing algorithms.

[1]  Pravin Varaiya,et al.  QoS aware adaptive resource allocation techniques for fair scheduling in OFDMA based broadband wireless access systems , 2003, IEEE Trans. Broadcast..

[2]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[3]  Guocong Song,et al.  Joint channel-aware and queue-aware data scheduling in multiple shared wireless channels , 2004, 2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733).

[4]  Kung Yao,et al.  Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System , 2002, EURASIP J. Adv. Signal Process..

[5]  Thomas M. Cover,et al.  Elements of Information Theory , 2005 .

[6]  Jeffrey G. Andrews,et al.  Optimal power allocation in multiuser OFDM systems , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[7]  Douglas L. Jones,et al.  Computationally efficient optimal power allocation algorithms for multicarrier communication systems , 2000, IEEE Trans. Commun..

[8]  Hui Liu,et al.  Dynamic resource allocation with finite buffer constraint in broadband OFDMA networks , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[9]  John M. Cioffi,et al.  Increase in capacity of multiuser OFDM system using dynamic subchannel allocation , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[10]  M. Andrews,et al.  Instability of the proportional fair scheduling algorithm for HDR , 2004, IEEE Transactions on Wireless Communications.

[11]  Raymond Knopp,et al.  Information capacity and power control in single-cell multiuser communications , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[12]  Ashutosh Sabharwal,et al.  Delay-bounded packet scheduling of bursty traffic over wireless channels , 2004, IEEE Transactions on Information Theory.

[13]  Matthew Andrews,et al.  Providing quality of service over a shared wireless link , 2001, IEEE Commun. Mag..