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Performance of Downlink Frequency Domain Packet Scheduling for the UTRAN Long Term Evolution | IEEE Conference Publication | IEEE Xplore

Performance of Downlink Frequency Domain Packet Scheduling for the UTRAN Long Term Evolution


Abstract:

In this paper we investigate the potential of downlink frequency domain packet scheduling (FDPS) for the 3GPP UTRAN long-term evolution. Utilizing frequency-domain channe...Show More

Abstract:

In this paper we investigate the potential of downlink frequency domain packet scheduling (FDPS) for the 3GPP UTRAN long-term evolution. Utilizing frequency-domain channel quality reports, the scheduler flexibly multiplexes users on different portions of the system bandwidth. Compared to frequency-blind, but time-opportunistic scheduling, FDPS shows gains in both average system capacity and cell-edge data rates on the order of 40%. However, the FDPS performance is shown to depend significantly on the frequency-domain scheduling resolution as well as the accuracy of the channel state reports. Assuming typical urban channel profile, studies show that the scheduling resolution should preferably be as low as 375 kHz to yield significant FDPS gain with two-branch receive diversity and in 20 MHz. Further, to have convincing FDPS gain the std. of error of radio state reports needs to be kept within 1.5-2 dB
Date of Conference: 11-14 September 2006
Date Added to IEEE Xplore: 11 December 2006
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Conference Location: Helsinki, Finland

I. Introduction

The ambitious design goal of the 3GPP UTRAN long-term evolution (LTE) is to provide spectral efficiency gains in the order of 3–4 compared to e.g. Release 6 high-speed downlink packet access (HSPDA) [1], [4]. For the LTE downlink OFDMA is considered to be the best access technology for providing high scalability up to large system bandwidths and to facilitate advanced frequency-domain scheduling methods. As LTE is optimized for packet data transfer only, the packet scheduler functionality assumes great significance. In this paper we study specifically the potential of frequency-domain multiplexing of users according to their instantaneous radio conditions. This is most often referred to as frequency domain packet scheduling (FDPS), although time-domain scheduling is inherent as well.

References

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