Considering firstly a twouser relay broadcast channel, we design a scheme based on superposition coding sc which maximizes the achievable sumrate under a proportional fairness constraint. In 46 proposed proportional fair pf scheduling algorithm that exploits the multiuser diversity to achieve fairness among users without. Proportional fair resource allocation also corresponds to an allocation that maximizes the sum of logarithms of received rates 5. Lte proportional fair scheduling free open source codes. Pdf in this work we consider the problem of downlink re source allocation for proportional fairness of long term received rates of data users and.
Lottery fairness study to make this process most ef. However, since a realistic deployment of wireless lans can consist of a network of aps, this paper considers proportional fairness in this much wider setting. A forward link, which can make a degree of balance between fairness and throughput. An opportunistic feedback technique is proposed for proportional fair pf scheduling in a downlink multiuser system. Lte mac scheduler analysis based on qos aware proportional. Hybrid scheduling schemes 14, 15 have also been proposed. Rr algorithm gives equal scheduling chance to each user in the cell, whereas pf. Lottery scheduling p the scheduler picks a winning ticket. Scheduling algorithm an overview sciencedirect topics. We apply proportional fair pf, round robin rr and modifiedpf scheduling algorithm for lte in order to find the best scheduler which provides. Also, it is the most powerful algorithm used in ltea because, it can work based on maintaining a balance between throughput and fairness for.
Abstractproportional fair pf scheduling algorithms are the defacto standard in cellular networks. The scheduler determines the optimal modulation and coding scheme for a scheduled user. Performance study of round robin and proportional fair. A proportional fair scheduling algorithm based on qos utility.
This script provides a means to test the performance of an lte. The proportional fair scheduling algorithm calculates a metric for all active users for a given scheduling interval. In broadband wireless access systems proportional fairness maintains a good tradeoff between spectral efficiency and fair ness. Proportional fair is a channelstate based scheduling al gorithm that relies on the. The scheduling algorithm running in the base station for the downlink can quickly adapt to fading channel conditions thanks to the feedback of the channel states. Proportional fair pf scheduling algorithms are the defacto standard for opportunistic schedulers in cellular networks. Pf scheduling algorithms have been extensively studied in the past e.
Adaptive proportional fair scheduling with globalfairness. In the satellite communication network system, in order to solve the problem of low system capacity and user fairness in multiuser access to satellite communication network in the downlink, combined with the characteristics of user data service, an algorithm study on throughput capacity and user fairness scheduling is proposed proportional fairness algorithm based on trafficbpf. The distinguishing value of the proposal resides in its. Quadratic proportional fair scheduling algorithm for ltea. Improved proportional fair scheduling algorithm in lte. Reduction of the feedback delay effect on a proportional. Currently, the classic scheduling algorithms are mainly round scheduling round robin, rr algorithm 7, the maximum carrier to interference scheduling max carrier to interference, max ci algorithm 8, proportional fair scheduling proportional fair, pf algorithm 10. Previous work has shown that proportional fair pf is an opportunistic scheduler that provides a good compromise between fairness and efficiency. These novel technologies implement opportunistic scheduling, taking advantage of the delaytolerance of elastic traffic, to augment the global capacity of the system. In 20, a weighted pf algorithm is proposed in order to maximize best. Ofdma represents a promising multiple access scheme for transmission over wireless channels, as it combines the orthogonal frequency division multiplexing ofdm modulation and subcarrier allocation. A proportional fair scheduling algorithm based on qos. The conventional proportional fair pf scheduling achieves fairness at the cost. A proportional fair scheduling algorithm pf provides balance between fairness and the overall system throughput.
Analytical model of proportional fair scheduling in. In our work, we propose a novel algorithm for scheduling of downlink resources with the objective of overcoming the performance limits of the wellknown existing solutions. However, with the deployment of new technologies, such as hdr high date rate and hsdpa high speed downlink packet access, this situation is bound to evolve rapidly and. In the satellite communication network system, in order to solve the problem of low system capacity and user fairness in multiuser access to satellite communication network in the downlink, combined with the characteristics of user data service, an algorithm study on throughput capacity and user fairness scheduling is proposed proportional fairness. Thus, at the cell edge, a combination of round robin and transmit diversity achieves very good data rate. Proportional fair scheduling algorithm in ofdmabased. Request pdf proportional fair multiuser scheduling in lte the challenge of scheduling user transmissions on the downlink of a long term evolution lte cellular communication system is addressed. Reduction of the feedback delay effect on a proportional fair. A proportional fair schedule is such that any positive change of a user in rate allocation must result in a negative overall change in the system.
Such an approach can result in nonpareto optimal bandwidth allocation when considering the network. Abstract to this day, traffic in cellular networks is still mainly realtime. It is based upon maintaining a balance between two competing interests. Proportional fair frequencydomain packet scheduling for 3gpp. Disclosed in the present application are a proportional fair pf scheduling implementation method and apparatus, and a device and a computerreadable storage medium. A weighted proportional fair pf scheduling method is proposed in the context of nonorthogonal multiple access noma with successive interference cancellation sic at the receiver side. Weighted proportional fair scheduling for downlink. The weighted proportional fair scheduler proceedings of the. Improved proportional fair scheduling algorithm in. In 3g data networks, network operators would like to balance system throughput while serving users in a fair manner. Bei yang, kai niu, zhiqiang he, wenjun xu, and yingpei. Weighted proportional fair scheduling for downlink nonorthogonal multiple access marierita hojeij, student member, ieee, charbel abdel nour, member, ieee, joumana farah, member, ieee, and catherine douillard, senior member, ieee abstractin this paper, a weighted proportional fair pf scheduling method is proposed in the context of non. Qosaware proportional fair qapf downlink scheduling algorithm for lte network 1zin mar myo, 2myat thida mon 1,2university of computer studies, yangon email. In case of transmit diversity, an improvement of signal to noise ratio is obvious.
Coordinated multipoint comp transmission and reception are introduced as a promising technology in the 3gpp lteadvanced standard, to manage interference, improve the overall system performance, and enhance system reliability. Weighted proportional fair scheduling for downlink non. We show how a monolithic, singlethreaded operating system kernel such as the freebsd kernel can be extended to allow proportional share execution of network packet and protocol processing. It was first presented in codedivision multiple access high datarates cdmahdr 15, 16, but is now used extensively in ofdma based systems as well. Request pdf proportional fair multiuser scheduling in lte the challenge of scheduling user transmissions on the downlink of a long term evolution lte cellular communication system is. Computer science department huawei technologies ucla, ca 90095 shanghai, china abstractwith the power consumption issue of mobile handset taken into account, singlecarrier fdma scfdma has been. Pdf proportional fair scheduling algorithm in ofdma.
Note that having an o1 gpsrelative delay is not suf. Pdf performance comparison between round robin and. Proportional fair scheduling algorithm proportional fair is used mostly in wireless networks. Utilizing geometric mean in proportional fair scheduling. Using the channel state information csi from the receiver, the opportunistic pf scheduling pfs algorithm for wireless networks was proposed in 4. Proportional fair scheduling in hierarchical modulation aided.
An efficient scheduling for radio resources in the physical layer of ltea base stations is challenging due to the high demand for various types of 4g. How are the wfq weights and the priority function related to each other. An apparatus for implementing a proportional fair scheduling, wherein the apparatus comprises. I would also be glad if the same terminology was used to explain the difference between proportional fair, maxmin fairness, maximum throughput scheduling and channeldependent scheduling.
Wo2019192307a1 proportional fair scheduling implementation. The most challenge of a pfs problem is the lack of analytic expression. Proportional fair scheduling in a wireless network, as the channels of different users are independent and heterogeneous, opportunistic scheduling was proposed to exploit the multiuser diversity gain to improve system ef. Proportional fair is a compromisebased scheduling algorithm. Currently, proportional fair scheduling is adopted in cdma2000 1x evdo rev. The new scheme introduces weights that adapt the classical pf metric to the noma scenario, improving performance indicators and enabling new services. This solution was shown to achieve both high capacity and high fairness. The scheduling of mobile users often relies on accurate feedback from the channel quality indicator cqi. Proportional fair resource allocation for coordinated multipoint transmission in lteadvanced abstract. Aug, 2019 in practical communication systems, there are always multiple subscribers competing for limited resources, such as time and frequency, hence effective user scheduling is essential to multiuser communications in achieving good system throughput and fairness performance. Various scheduling strategies have been implemented in ofdma systems. Proportionalfair resource allocation for coordinated. In this paper, we consider the effects of scheduling algorithms on the throughput performance. Introduction cellular networks are facing a considerable increase in mobile data traf.
May 22, 2017 in order to reduce these collisions, we propose and evaluate through simulations a novel scheduling algorithm, called neighboraware proportional fair npf, which takes into account both channel state conditions and the number of uncoordinated nodes neighboring each scheduled node in the aggregate scheduling metric. Throughput analysis of the proportional fair scheduler in. In order to reduce these collisions, we propose and evaluate through simulations a novel scheduling algorithm, called neighboraware proportional fair npf, which takes into account both channel state conditions and the number of uncoordinated nodes neighboring each scheduled node in the aggregate scheduling metric. Neighborsaware proportional fair scheduling for future. Proportional fair is a channelstate based scheduling algorithm that relies on the concept of exploiting user diversity. In this paper, we analyzed the performances of round robin and proportional fair scheduling methods for two different. School of electronics and information engineering, harbin institute of technology, harbin, china. Exploiting mobility in proportional fair cellular scheduling. The worstcase single packet delay of bsfq is proportional to the number of o ws. Enhanced throughput and fairness in lte dl mahir ayhan. In case of long term evolution lte, the scheduler in the mac layer of the enodeb allocates the available radio resources among different ues in a cell through proper handling of priority. They exploit the users channel state diversity induced by fastfading, and are optimal for stationary channel state distributions and an in.
We study this degradation under fairness constraints using a proportional fair scheduler. Analytical evaluation of the performance of proportional. User fairness scheme with proportional fair scheduling in multiuser mimo limited feedback system. The most commonly used and powerful scheduling algorithm in ltea is proportional fair 12. Throughput analysis of the proportional fair scheduler in hsdpa. There should be an article on scheduling communication. Consider a model where there are active users sharing a wireless channel with the channel condition seen. We show the nphardness of the frequencydomain scheduling.
In this paper, we determine the strength of the effect of feedback delay on the scheduler in a longterm evolution lte system. For example, a maximum rate scheduling is demonstrated to enhance both system throughput and fairness in multicarrier ofdma systems 3. In cdma spread spectrum cellular networks, the cost may be the required energy per bit in the transmit power control the. Proportional share scheduling of operating system services. The proportional fair scheduling pfs algorithm 2 4 9. The lte link level simulator simulator is provided with a test simulation scenario that can be used to verify that the simulator runs in the expected way. They aim to provide high throughput while maintaining fairness among the users. Proportional fair frequencydomain packet scheduling for 3gpp lte uplink sukbok lee. The scheduling method used largely impacts the throughput. Trying to maximize total throughput of the network wired or not while at the same time allowing all users at least a minimal level of service. Proportional fair frequencydomain packet scheduling for. An efficient scheduling for radio resources in the physical layer of ltea base stations is. Performance evaluation of proportional fairness scheduling in lte. Nov 15, 2012 the optimal power allocation parameters of each sc layer are derived by analysis.
Consider a model where there are n active users sharing a wireless channel with the channel condition. Generalized proportional fair scheduling in third generation. This technique requires each mobile station, the scheduling metric of which is higher than a threshold, to send onebit feedback for pf scheduling. In a practical wireless system, a greedy algorithm that selects the user with the best channel. At each scheduling instance, the priority of user i, ri, is calculated based on the users. Bin sort fair queuing bsfq 4 uses an approximate bin sort mechanism to schedule packets. The algorithm tries is provide fairness among ues while maximizing the. Proportionalfair resource allocation for coordinated multipoint transmission in lteadvanced abstract. Ofdma represents a promising multiple access scheme for transmission over wireless channels, as it combines the orthogonal frequency division multiplexing ofdm modulation and subcarrier. The selection of the user to schedule is based on a balance between the current possible rates and fairness. Proportional fair scheduling algorithm based on traffic in.
In practical communication systems, there are always multiple subscribers competing for limited resources, such as time and frequency, hence effective user scheduling is essential to multiuser communications in achieving good system throughput and fairness performance. Proportional fair multiuser scheduling in lte request pdf. Proportionally fair scheduling can be achieved by means of weighted fair queuing wfq, by setting the scheduling weights for data flow to, where the cost is the amount of consumed resources per data bit. User fairness scheme with proportional fair scheduling in. Analytical evaluation of the performance of proportional fair. Proposed scheduling algorithm the main important role of the scheduler is the allocation of resources to ues at each time slot to achieve maximization in throughput and fairness for each user. Proportionalfair resource allocation for coordinated multi. This is achieved using the notion of proportional fairness. This paper provides an analytical evaluation of the performance of proportional fair pf scheduling in orthogonal frequencydivision multiple access ofdma wireless systems. While the algorithm components of these schemes are similar to those.
Many works have tackled on the problem of throughput and fairness optimization in cellular cooperative relaying systems. Ioannis pefkianakis adam meyerson shugong xu songwu lu. However, so far, proportional fairness has been applied at each base station independently. Proportional fair scheduling was recently studied for multi. Proportional fair scheduling with superposition coding in a. The weighted proportional fair scheduler proceedings of. In this paper we explore this fundamental problem of lte scfdma uplink scheduling by adopting the conventional timedomain proportional fair algorithm to maximize its objective i. Proportional fair scheduling with superposition coding in. Performance of proportional fairness scheduling pfs 1 and. Next, we consider the general multiuser case in a cellular relay system, for which we design resource allocation algorithms based on proportional fair scheduling exploiting the proposed scbased scheme. Qosaware proportional fair qapf downlink scheduling algorithm for lte network proceedings of seventh theiier international conference, singapore, 3rd january 2015, isbn. Proportional fair scheduling algorithm in ofdmabased wireless systems with qos constraints article pdf available in journal of communications and networks 121.
The basic algorithm the proportional fair algorithm is a packet scheduling method that provides reasonable level of fairness to the users and in the same time it is able to achieve high overall throughput. Pdf proportional fair scheduling algorithm in ofdmabased. Pdf the weighted proportional fair scheduler eitan. The proportional fair pf scheduling technique is well known technique that is used to schedule radio resources at the mobile base station to the endusers. Performance evaluation of proportional fairness scheduling. The proportional fair scheduling pfs algorithm is considered an attractive bandwidth allocation criterion in wireless networks for supporting high resource utilization while maintaining good fairness among network flows.
Performance comparison between round robin and proportional. Pdf the weighted proportional fair scheduler eitan altman. The user with the highest metric is allocated the resource available in the given interval, the metrics for all users are updated before the next scheduling interval, and the process repeats. Analytical insight under rayleigh fading environment. Rr algorithm gives equal scheduling chance to each. Enhanced proportional fair scheduling for cdma2000 1x ev.