Scheduling algorithms for quality of service aware OFDMA wireless systems

Farrokhi, Farrokh; Olfat, M.; Alasti, Mehdi; Liu, K.J.R.

doi:10.1109/glocom.2004.1378493

Cited by 14 publications

(7 citation statements)

References 6 publications

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“…QoS-aware packet schedulers are studied in [1] and [2], however, these solutions do not consider LTE-specific requirements. In LTE, the resources that can be assigned to a UE have both time and frequency dimensions.…”

Section: Introductionmentioning

confidence: 99%

DRX and QoS-aware energy-efficient uplink scheduling for long term evolution

Ergül

Yılmaz

Koc

et al. 2013

2013 IEEE Global Communications Conference (GLOBECOM)

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Discontinuous reception (DRX) is supported in 3GPP Long Term Evolution (LTE) to reduce power consumption of user equipments (UEs). Power conservation achieved via DRX can be further increased with a packet scheduler that takes DRX states into consideration. Thus, in addition to quality of service (QoS) and fairness factors, which have been the main focus so far in scheduler design, energy efficiency must also be considered in scheduling. In this paper, we introduce a DRX and QoS-aware uplink packet scheduling algorithm (DQEPS) for LTE networks. One of the main reasons of poor DRX utilization is the continuous uplink packet traffic generated by applications working in the background. Accordingly, we first lay out the cumulative distribution functions (CDF) of interpacket arrival durations constructed by inspecting uplink packet transmission for various applications. Then, we form metrics for each bearer using these CDFs along with the DRX states, QoS parameters, channel conditions, and the buffer status of the bearers. Using these metrics, we develop a scheduling algorithm for the uplink, which aims to maximize power conservation of DRX mechanism by scheduling packets in a way that tries to minimize ON duration, while meeting the QoS requirements. Performance evaluations indicate that DQEPS reduces power consumption significantly compared to the previously proposed methods for LTE.

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Section: Introductionmentioning

confidence: 99%

DRX and QoS-aware energy-efficient uplink scheduling for long term evolution

Ergül

Yılmaz

Koc

et al. 2013

2013 IEEE Global Communications Conference (GLOBECOM)

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“…While time domain multiplexing radio access system like High Speed Downlink Packet Access (HSDPA) allows time domain user diversity packet scheduling [2], OFDMA also provides the possibility of performing frequency domain packet scheduling and thereby obtain significant gains in cell throughput and coverage thanks to multiuser frequency diversity [3]. QoS aware packet schedulers for OFDMA are studied in [4] and [5]. Those algorithms do not consider practical aspects and restrictions that will be met in an actual system like LTE.…”

Section: Introductionmentioning

confidence: 99%

QoS Oriented Time and Frequency Domain Packet Schedulers for The UTRAN Long Term Evolution

Mongha

Pedersen

Kovács

et al. 2008

VTC Spring 2008 - IEEE Vehicular Technology Conference

142

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In this paper we introduce Orthogonal Frequency Division Multiple Access (OFDMA) downlink general packet scheduling methods for throughput fairness control among users. The investigation is based on the 3GPP UTRAN Long Term Evolution (LTE) and a decoupled time/frequency domain packet scheduler approach is used. It is shown that fairness can be effectively controlled with frequency domain metric weighting or Time Domain Priority Set Scheduling (TD-PSS) depending on the number of users in the cell. Furthermore we introduce a principle of metric decoupling between time and frequency domain schedulers that is fundamental for maximizing throughput control. The algorithms are simulated in Best Effort (BE) and Constant Bit Rate (CBR) users conditions. They are shown to provide coverage gains of up to 60% for a cell throughput loss of 5% over the well known time-frequency domain proportional fair scheduler.

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“…In [15], Aniba and Aissa presented a similar approach for adaptive PF. Other approaches by Hosein [10] and Farrokhi [9] has been proposed and they aims to define a network revenue function which allow capacity maximization and QoS fulfilment.…”

Section: Introductionmentioning

confidence: 99%

Scheduling Algorithms for 3GPP Long-Term Evolution Systems: From a Quality of Service Perspective

Gidlund

Laneri

2008

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications

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3GPP is in the process of defining the long-term evolution (LTE) for 3G radio access in order to maintain the future competitiveness for 3G technology. In this paper, we consider packet scheduling for the 3GPP LTE downlink in a multiuser OFDMA environment. The Quality of Service (QoS) concept proposed for LTE is a realization of Diffserv for 3GPP access networks, where each QoS class is associated with a policy profile. Our main goal is to design 3GPP LTE scheduler within this Diffserv context under realistic traffic models such as file transfer and web browsing. Our obtained results show that the associated Diffserv polices can enforced and hence provide an effective way of dividing bandwidth between QoS classes. We further show possible benefits of having service-dependent scheduling algorithms 1

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Scheduling algorithms for quality of service aware OFDMA wireless systems

Cited by 14 publications

References 6 publications

DRX and QoS-aware energy-efficient uplink scheduling for long term evolution

DRX and QoS-aware energy-efficient uplink scheduling for long term evolution

QoS Oriented Time and Frequency Domain Packet Schedulers for The UTRAN Long Term Evolution

Scheduling Algorithms for 3GPP Long-Term Evolution Systems: From a Quality of Service Perspective

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