SCIENCE CHINA Information Sciences, Volume 62, Issue 4: 042306(2019) https://doi.org/10.1007/s11432-018-9746-9

## Exponentially weighted proportional fair scheduling algorithm for the OFDMA system

• AcceptedDec 6, 2018
• PublishedMar 7, 2019
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### Abstract

This study aims to propose an exponentially weighted proportional fair (EWPF) scheduling algorithm for orthogonal frequency division multiple access (OFDMA) system for long-term evolution downlink transmission. The proposed algorithm improves the system performance in the user-perceived throughput (UPT) by adding exponential weights to different types of services. The UPT employed to measure the system capability is novel and customer oriented; it reflects the experiences of users in an efficient manner and determines whether the user's scheduling is reasonable. The EWPF algorithm is compared with two other schedulers, and our simulation results showed that the EWPF can increase the overall UPT and can maintain the fairness for prioritizing the transmission of some types of traffic.

### Acknowledgment

This work was partially supported by National Natural Science Foundation of China (Grant Nos. 61703326, 61673308, 61673014), Natural Science Foundation of Shaanxi Province (Grant No. 2017JQ5037), and Fundamental Research Funds for the Central Universities (Grant No. 20101186377).

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• Figure 1

(Color online) The difference between the UPT and UPT-cut.

• Figure 2

(Color online) Users attached to different schedulers.

• Figure 5

(Color online) Comparisons between PF, FAHT and EWPF algorithms. (a) UPT-cut of RT Traffic; (b) UPT-cut of NRT Traffic.

• Figure 6

(Color online) The amount of data left. (a) Number of users = 27; (b) number of users = 30. Each user is represented by a line of a different color. The real and dotted lines represent the RT and NRT traffic, respectively.

• Table 1   Simulation parameters for LTE downlink system
 Item Parameter settings Number of RB 5 Maximum power of directional antenna 43 dBm (20 W) Total bandwidth 180 kHz Subcarrier bandwidth 15 kHz Sector radius 200 m Height of BS 35 m BS antenna gain 15 dBi Mobile station antenna gain 0 Path-loss model 34.5+35$\times$log10(d) (dB) Shadow-fading standard deciation 8 dB Fast fading channel model Rayleigh distribution Thermal noise density $-$174 dBm/Hz System and link level mapping interface EESM Target bit-error-rate (BER) 10% Frequency reuse factor 1 Power allocation policy Equally distributed Number of users per sector Change from 3 to 30 User distribution Uniformly distributed per sector Average window size 5 TTI

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