404 research outputs found

    Analysis of MAC-level throughput in LTE systems with link rate adaptation and HARQ protocols

    Get PDF
    LTE is rapidly gaining momentum for building future 4G cellular systems, and real operational networks are under deployment worldwide. To achieve high throughput performance, in addition to an advanced physical layer design LTE exploits a combination of sophisticated mechanisms at the radio resource management layer. Clearly, this makes difficult to develop analytical tools to accurately assess and optimise the user perceived throughput under realistic channel assumptions. Thus, most existing studies focus only on link-layer throughput or consider individual mechanisms in isolation. The main contribution of this paper is a unified modelling framework of the MAC-level downlink throughput of a sigle LTE cell, which caters for wideband CQI feedback schemes, AMC and HARQ protocols as defined in the LTE standard. We have validated the accuracy of the proposed model through detailed LTE simulations carried out with the ns-3 simulator extended with the LENA module for LTE

    Analysis and Simulation of LTE Downlink and Uplink Transceiver

    Get PDF
    LTE (Long Term Evolution) is a next generation standard by 3rd Generation Partnership Project (3GPPP) consortium. In this paper, the physical layer (PHY) of LTE transceiver is analyzed in downlink and uplink transmissions. Simulations of the physical layer of LTE transceiver are obtained with the use of LTE System Toolbox by Mathworks. Simulation results are presented to show the performance of LTE transceivers in Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH). Measurements of throughput and Bit Error Rate (BER) are obtained for different simulation configurations

    Efficient Multicast in Next Generation Mobile Networks

    Get PDF

    Analisi di protocolli HARQ per il sistema cellulare LTE. Analysis of HARQ protocols for LTE cellular system

    Get PDF
    In questa tesi vengono studiati i protocolli di Hybrid-ARQ (HARQ) implementati in LTE. Vengono ricavati modelli analitici dei suddetti protocolli e viene proposta una modifica che, tramite un approccio Bayesiano, ne migliora le prestazioni in termini di throughput e di ritardo. La quantificazione dei miglioramenti viene effettuata valutando i modelli proposti per via numerica. Il lavoro è stato ispirato dai requisiti delle reti cellulari 5G che sono in fase di definizioneopenEmbargo temporaneo per motivi di segretezza e/o di proprietà dei risultati e/o informazioni sensibil

    WIMAX LINK PERFORMANCE ANALYSIS FOR WIRELESS AUTOMATION APPLICATIONS

    Get PDF
    Wireless broadband access technologies are rapidly growing and a corresponding growth in the demand of its applicability transcends faster internet access, high speed file download and different multimedia applications such as voice calls, video streaming, teleconferencing etc, to industrial operations and automation. Industrial and automation systems perform operations that requires the transmission of real time information from one end to another through high-performance wireless broadband communication links. WiMAX, based on IEEE 802.16 standard is one of the wireless broadband access technologies that has overcome location, speed, and access limitations of the traditional Digital Subscriber Line and Wireless Fidelity, and offers high efficient data rates. This thesis presents detailed analysis of operational WiMAX link performance parameters such as throughput, latency, jitter, and packet loss for suitable applicability in wireless automation applications. The theoretical background of components and functionalities of WiMAX physical and MAC layers as well as the network performance features are presented. The equipment deployed for this field experiment are Alvarion BreeZeMAX 3000 fixed WiMAX equipment operating in the 3.5 GHz licensed band with channel bandwidth of 3.5 MHz. The deployed equipment consisting of MBSE and CPE are installed and commissioned prior to field tests. Several measurements are made in three link quality scenarios (sufficient, good and excellent) in the University of Vaasa campus. Observations and results obtained are discussed and analyzed.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format
    corecore