Channel aware optimized proportional fair scheduler for LTE downlink
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Channel aware optimized proportional fair scheduler for LTE downlink B. Satheesh Monikandan 1,2 & A. Sivasubramanian 3 & S. P. K. Babu 1 & G. K. D. Prasanna Venkatesan 4 & C. Arunachalaperumal 5 Received: 3 August 2019 / Accepted: 24 September 2019 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Long Term Evolution (LTE) mobile networks, time-frequency radio resources are allotted with respect to Quality of Service (QoS) requirements using scheduling algorithms. Buffer Occupancy (BO), Average Cellular Throughput (ACT), Average User Throughput (AUT), Blocking Probability (BP) and Fairness Index (FI) are the parameters to be considered when designing a scheduler. A new scheduling policy is proposed in this paper, called “Channel Aware Optimized Proportional Fair (CAOPF)” to optimize the channel behavior based on Channel Quality Indicator (CQI). The performance of the introduced scheduler is investigated and compared with the other schedulers such as Round Robin (RR) and Proportional Fair (PF). Simulation results indicate that the new scheduler gives the best level of QoS performance in terms of the above said parameters when compared with the other schedulers taken into account. It provides no pending data of users in good channel condition, higher ACT, higher improvement in user throughput in good and average channel conditions. In addition, very low blocking of user data in good channel condition and optimized FI and resource block (RB) allocated to the users in all channel conditions are seen. Keywords Channel . PF . LTE . Downlink . CQI
1 Introduction LTE is preferred in mobile networks nowadays due to the high growth of Internet applications and multimedia services. It adapts Orthogonal Frequency Division Multiple Access (OFDMA) in the downlink (DL) and Single Carrier FDMA (SC-FDMA) in the uplink (UL). As per LTE specifications, user equipments (UE) are assigned a number of subcarriers (SC) according to the flexible bandwidth [1], for a predefined period of time, called
* B. Satheesh Monikandan [email protected] 1
Department of ECE, Periyar Maniammai Institute of Science and Technology, Thanjavur, Tamil Nadu 613 403, India
2
Faculty of ECE, Indian Naval Academy, Ezhimala, Kerala 670 310, India
3
Mount Zion Institute of Science and Technology, Chengannur, Kerala 689 521, India
4
Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu 641 021, India
5
S.A. Engineering College, Chennai, Tamil Nadu 600 077, India
Transmission Time Interval (TTI). For the resource assignment to the users and to satisfy their QoS requirements [2, 3] lot of scheduling algorithms were introduced by the different researchers already. Scheduling in LTE DL is happening in two domains, time domain (TD) and frequency domain (FD) [4]. Particularly, user selection for the operation is happening in TD for every 1 ms TTI and RB allocation to the users is happening in FD. The structure of DL scheduling and RB allocation for different data services in LTE is shown in Fig. 1. We know that
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