Conference Paper

Proportional Fair Frequency-Domain Packet Scheduling for 3GPP LTE Uplink

Comput. Sci. Dept., UCLA, Los Angeles, CA
DOI: 10.1109/INFCOM.2009.5062197 Conference: INFOCOM 2009. 28th IEEE International Conference on Computer Communications, Joint Conference of the IEEE Computer and Communications Societies, 19-25 April 2009, Rio de Janeiro, Brazil
Source: DBLP


With the power consumption issue of mobile handset taken into account, Single-carrier FDMA (SC-FDMA) has been selected for 3GPP Long-Term Evolution (LTE) uplink multiple access scheme. Like in OFDMA downlink, it enables multiple users to be served simultaneously in uplink as well. However, its single carrier property requires that all the subcarriers allocated to a single user must be contiguous in frequency within each time slot. This contiguous allocation constraint limits the sch eduling flexibility, and frequency-domain packet scheduling algor ithms in such system need to incorporate this constraint while trying to maximize their own scheduling objectives. In this paper we explore this fundamental problem of LTE SC-FDMA uplink scheduling by adopting the conventional time- domain Proportional Fair algorithm to maximize its objective (i.e. proportional fair criteria) in the frequency-domain setting. We show the NP-hardness of the frequency-domain scheduling problem under this contiguous allocation constraint and present a set of practical algorithms fine tuned to this problem. We demonstrate that competitive performance can be achieved in terms of system throughput as well as fairness perspective, which is evaluated using 3GPP LTE system model simulations.

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Available from: Shugong Xu, Oct 08, 2015
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    • "Error bars in the results are the 95% confidence intervals. Although our approach can be tested with any scheduler , here we refer to the Proportional Fair (PF) scheme for scheduling cellular users, since it represents the state of the art for schedulers used in real implementations [12], [22]. In addition to our heuristics, we evaluate three benchmark schemes, namely, Forced-LTE, Forced-WiFi, and Optimal. "
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    • "The work done in [1], explores the issue of contiguous allocation of subcarriers with the help of uplink scheduling with time domain. It uses the Proportional Fair algorithm to achieve fairness. "
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    • "Solving the scheduling problem can be a very complex task, given the number of factors to take into account, mainly because the number of scheduling patterns to examine can be huge and the scheduler has a hard-time constraints of one TTI to come up with the optimal allocation scheme (mapping of resources allocated to devices). Indeed, as uplink scheduling has the constraint that the RBs allocated to a device need to be continuous with respect to the frequency, the optimization problem of uplink packet scheduler is NP-Hard [13]. "
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