Abstract
This paper proposes the design of a scheduling framework for the downlink of the Long Term Evolution (LTE) system with the objective of meeting the Quality of Service (QoS) requirements as defined by the QoS architecture of the 3G Partnership Project (3GPP) specifications. We carry out a thorough review of 3GPP specifications analyzing the requirements of the 3GPP QoS architecture. LTE bearers may be associated with a Guaranteed Bit Rate (i.e., GBR bearers) or not (i.e., non-GBR bearers). Additionally, the specifications establish a Packet Delay Budget (PDB) to limit the maximum packet transfer delay. To achieve our goal, we design a channel-aware service discipline for GBR bearers which is able to fulfill not only the GBR but also the PDB. Additionally, we also design an algorithm for prioritizing GBR and non-GBR bearers from different QoS Class Identifiers (QCIs) following 3GPP QoS rules. We compare the proposed framework with two reference schedulers by means of network-level simulations. The results will show the ability of the proposed framework to address the QoS requirements from 3GPP specifications while providing an interesting performance from a spectral efficiency viewpoint.
Highlights
Numerous operators worldwide have commercially launched Long Term Evolution (LTE) and LTE-Advanced (LTE-A) networks in recent years
We identify that if the PDB cannot be fulfilled for all bearers prioritization between bearers of different Quality of Service (QoS) classes should be triggered. (ii) The design of a channel-aware service discipline for GBR bearers that is able to fulfill the Guaranteed Bit Rate and the Packet Delay Budget
We conclude that a 3G Partnership Project (3GPP)-based scheduling framework has to be able to detect if the PDB cannot be fulfilled for all bearers and, in that case, prioritize between bearers of different QoS Class Identifiers (QCIs)
Summary
Numerous operators worldwide have commercially launched Long Term Evolution (LTE) and LTE-Advanced (LTE-A) networks in recent years. 2.1 QoS-aware strategies for real-time traffic Concentrating on QoS-aware scheduling algorithms, the Modified-Largest Weighted Delay First (M-LWDF) [6], the Exponential/Proportional Fair (EXP/PF), the Exp rule, and the Log rule are relevant proposals described in those overviews Despite these scheduling algorithms providing very interesting performance benefits [3,4,5], they are not well suited to fulfilling the QoS requirements of 3GPP specifications. They were originally designed for a scenario with real-time traffic only. The assignment of bearer k to QCIm will be denoted as k QCIm
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