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This paper focuses on an essential task of the enhanced NodeB eNodeB elementin LTE architecture, the Radio Resource Manager RRM, which aims to accept orreject requests for connection to the network based on some constraints andensuring optimal distribution of radio resources between Users Equipments UEs.Its main functionalities include Admission Control AC and Packet Scheduling PS.This paper will center mainly on the PS part of the RRM task, which performsthe radio resource allocation in both uplink and downlink directions. Severalapproaches and algorithms have been proposed in the literature to address thisneed ie : allocate resources efficiently, the diversity and multitude ofalgorithms is related to the factors considered for the optimal management ofradio resource, specifically, the traffic type and the QoS Quality of Servicerequested by the UE. In this article, an art's state of the radio resourceallocation strategies and a detailed study of several scheduling algorithmsproposed for LTE (uplink and downlink) are made. Therefore, we offer ourevaluation and criticism.

Survey On Scheduling And Radio Resources Allocation In Lte