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HARQ Aware Frequency Domain Packet Scheduler with Different Degrees of Fairness for the UTRAN Long Term Evolution | IEEE Conference Publication | IEEE Xplore

HARQ Aware Frequency Domain Packet Scheduler with Different Degrees of Fairness for the UTRAN Long Term Evolution


Abstract:

In this paper we evaluate the performance of downlink channel dependent scheduling in time and frequency domains. The investigation is based on the 3GPP UTRAN long term e...Show More

Abstract:

In this paper we evaluate the performance of downlink channel dependent scheduling in time and frequency domains. The investigation is based on the 3GPP UTRAN long term evolution (LTE) parameters. A scheduler framework is developed encompassing frequency domain packet scheduling, HARQ management and inter-user fairness control. It is shown that by dividing the packet scheduler into a time-domain and a frequency-domain part the fairness between users can be effectively controlled. Different algorithms are applied in each scheduler part, and the combined performance is evaluated in terms of cell throughput, coverage, and capacity. We show that frequency-domain packet scheduling can provide a gain of around 35% in both throughput and coverage over opportunistic time-domain only scheduling. Furthermore, it is shown that by using an equal throughput scheduler, coverage can be improved by 100% at the expense of a 5% loss in average cell throughput in comparison with the proportional fair scheduler.
Date of Conference: 22-25 April 2007
Date Added to IEEE Xplore: 29 May 2007
Print ISBN:1-4244-0266-2
Print ISSN: 1550-2252
Conference Location: Dublin, Ireland

I. Introduction

Orthogonal frequency division multiple access (OFDMA) has been selected as the downlink access technology for the 3GPP UTRAN long-term evolution (LTE) system [1]. It provides scalability, simple equalization and facilitates advanced frequency-domain adaptation techniques. In this paper we investigate the performance of various downlink packet scheduling (PS) algorithms that are able to exploit available multi-user diversity in both time and frequency domains. This is often referred to as frequency domain packet scheduling (FDPS).

References

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