Title :
On channel-aware frequency-domain scheduling with QoS support for uplink transmission in LTE systems
Author :
Lung-Han Hsu ; Hsi-Lu Chao
Author_Institution :
Dept. of Comput. Sci., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
Oct. 29 2013-Nov. 1 2013
Abstract :
Due to the power consumption issue of user equipment (UE), Single-Carrier FDMA (SC-FDMA) has been selected as the uplink multiple access scheme of 3GPP Long Term Evolution (LTE). Similar to OFDMA downlink, SC-FDMA enables multiple UEs to be served simultaneously in uplink as well. However, the single carrier characteristic requires that all the allocated subcarriers to a UE must be contiguous in frequency with each time slot. Moreover, a UE should adopt the same modulation and coding scheme at all allocated subcarriers. These two constraints do limit the scheduling flexibility. In this paper, we formulate the UL scheduling problem with proportional fairness support by taking two constraints into consideration. Since this optimization had been proven to be an NP-hard problem, we further develop one heuristic algorithm. We demonstrate that competitive performance can be achieved in terms of system throughput, which is evaluated by using 3GPP LTE system model simulations.
Keywords :
3G mobile communication; Long Term Evolution; OFDM modulation; computational complexity; frequency allocation; frequency division multiple access; heuristic programming; optimisation; quality of service; radio links; scheduling; wireless channels; 3GPP Long Term Evolution; LTE; NP-hard problem; OFDMA; QoS; SC-FDMA; UE; UL scheduling problem; channel-aware frequency-domain scheduling; frequency allocation; heuristic algorithm; modulation coding scheme; optimization; power consumption; proportional fairness support; single-carrier FDMA; subcarrier allocation; uplink multiple access scheme; uplink transmission; user equipment; Long Term Evolution; Resource management; Robustness; Scheduling; Scheduling algorithms; Signal to noise ratio; Throughput; LTE; SC-FDMA; channel-aware scheduling; contiguous constraint; proportional fairness; resource allocation; robust rate constraint; uplink;
Conference_Titel :
Signal and Information Processing Association Annual Summit and Conference (APSIPA), 2013 Asia-Pacific
Conference_Location :
Kaohsiung
DOI :
10.1109/APSIPA.2013.6694224