Show simple item record

dc.contributorMahmood, Nurul Huda
dc.contributorPérez Romero, Jordi
dc.contributorPedersen, Klaus
dc.contributorLaselva, Daniela
dc.contributor.authorAl-Mshahde, Mohammed
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.coverage.spatialeast=9.921746999999982; north=57.0488195; name=Bispensgade 1, 9000 Aalborg, Dinamarca
dc.descriptionUser association in wireless networks has historically been done on the basis of single connectivity, i.e. the user equipment (UE) being connected to a single serving access point (AP). Such a design was quite efficient for conventional homogeneous networks with mostly voice-centric applications. However, as networks become more heterogeneous and services become diverse with different performance requirements, connecting to a single AP has proven to be quite inefficient
dc.description.abstractThe 5th Generation (5G) New Radio (NR) interface is expected to continue utilising the existing homogenous networks for some time in the near future serving a wide range of use cases, one of those cases is Ultra-Reliable Low Latency Communications (URLLC) services. For URLLC, short data packets must be correctly transmitted and received within very short latency up to 1ms with a reliability of 99.999%. There are several options being proposed to meet this difficult design target. One very promising suggested solution is the dual connectivity with data duplication, where the same packet is duplicated and independently transmitted via two different nodes. This work uses a system-level simulation to study how the data duplication at PDCP level for dual connectivity is functioning, where every copy of the designated packet is sent via the two connections that a certain User Equipment (UE) is connected. The studied scenario is a homogeneous network of 21 macro cells of 500m inter-site distance. The scenario is first optimized for the single connectivity mode, which supports less than 1Mbps URLLC offered load while meeting the IMT2020 latency requirements. As we enable dual connectivity, in a URLLC traffic only scenario, it is shown that dual connectivity provides some noticeable gain by enabling the support of up to 1.5Mbps URLLC load within the URLLC requirements but not improving the low load criteria in comparison to single connectivity results due to the low interference condition in single connectivity. As a second stage, the gain of DC is studied when the URLLC traffic coexist with a heavy full buffer background eMBB traffic. Results show that a latency gain as well as higher load support than the single connectivity case can be obtained by dual connectivity, however the sensitivity of this gain on the scenario conditions is very high. Finally, an enhanced duplication configuration is added, that is if a packet is successfully sent through one of the links and correctly decoded at the UE, the duplicated copy transmission on the other link is cancelled (i.e. the packet is dropped at the network side). This results in a significant performance improvement in terms of the latency and supported URLLC load especially at relatively high load because it avoids the queuing delay.
dc.publisherUniversitat Politècnica de Catalunya
dc.rightsS'autoritza la difusió de l'obra mitjançant la llicència Creative Commons o similar 'Reconeixement-NoComercial- SenseObraDerivada'
dc.subjectÀrees temàtiques de la UPC::Informàtica
dc.subject.lcshMobile communication systems
dc.subject.lcshWireless communication systems
dc.subject.otherDual Connectivity
dc.subject.otherData Duplication
dc.subject.otherUltra Reliability
dc.subject.otherLow Latency
dc.titleReliability-oriented intra-frequency dual connectivity for 5G systems: Configuration algorithms and performance evaluation
dc.title.alternativeReliability-Oriented Intra-Frequency Dual Connectivity for 5G Systems: Configuration Algorithms and Performance Evaluation
dc.typeMaster thesis
dc.subject.lemacComunicacions mòbils, Sistemes de
dc.subject.lemacComunicació sense fil, Sistemes de
dc.rights.accessOpen Access
dc.audience.mediatorEscola Tècnica Superior d'Enginyeria de Telecomunicació de Barcelona
dc.contributor.covenanteeAalborg universitet

Files in this item


This item appears in the following Collection(s)

Show simple item record

Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain