24 documents found, page 1 of 3
Transmitted Power Formulation for the Optimization of Spectrum Aggregation in L...
Acevedo Flores, Jessica Elizabeth; Robalo, Daniel; Velez, FernandoThis work starts by proposing a formulation to calculate the transmitter power needed to cover cells of different sizes, whilst maintaining the average signal to interference-plus-noise ratio constant, and near the maximum, for two Long Term Evolution (LTE) systems operating over non-contiguous frequency bands, 800 MHz and 2 GHz, with an integrated common radio resource management (iCRRM) entity. In the context...
Supporting unified distributed management and autonomic decisions: design, impl...
Ferreira, Carlos; Guardalben, Lucas; Gomes, Tomé; Sargento, Susana; Salvador, Paulo; Robalo, Daniel; Velez, FernandoNowadays, the prevailing use of networks based on traditional centralized management systems reflects on a fast increase of the management costs. The growth in the number of network equipments and services reinforces the need to distribute the management responsibilities throughout the network devices. In this approach, each device executes common network management functionalities, being part of the overall ne...
Fundamental Limits for LTE Radio and Network Planning
Velez, Fernando J.; Acevedo Flores, Jessica; Robalo, DanielA comprehensive study on the variation of the carrier-to-noise-plus-interference ratio (CNIR) with different system parameters is of fundamental importance in the context of LTE planning. For cellular planning purposes, the UL and DL CNIRs from/at the mobile station are very important parameters, although we are only considering DL in this work. From a detailed analysis of its variation with the coverage and re...
LTE-Advanced Radio and Network Optimization: Basic Coverage and Interference Co...
Velez, Fernando J.; Sousa, Sofia; Acevedo Flores, Jessica; Robalo, Daniel; Mihovska, Albena; Prasad, RamjeeIn cellular optimization, the UL and DL the values from carrier-to-noise-plus-interference ratio (CNIR) from/at the mobile station are very important parameters. From a detailed analysis of its variation with the coverage and reuse distances for different values of the Channel Quality Indicator (CQI) and given ITU-R propagation models, an evaluation of the possible range for the reuse factor of LTE-A is perform...
Extending the LTE-Sim Simulator with Multi-Band Scheduling Algorithms for Carri...
Robalo, Daniel; Velez, Fernando J.; Paulo, Rui R.; Piro, GiuseppeCarrier Aggregation (CA) has been proposed by 3GPP LTE-Advanced to meet or even exceed IMT-Advanced systems enhanced peak data rates requirements. In its rationale, multiple Component Carriers (CC) can be flexibly aggregated so that user equipment can access a total bandwidth of up to 100 MHz. As each CC has the same structure as the one from LTE R8, CA does not require notable changes in the LTE physical layer...
Dynamic Configuration and Optimization of WiMAX Networks with Relay Power Savin...
Robalo, Daniel; Oliveira, João R.; Velez, Fernando J.; Holland, Oliver; Aghvami, A. HamidThis paper investigates the performances achievable by WiMAX networks deployed in various sectorization configurations, with and without relay stations (RSs). Further, it studies the dynamic adjustment of the configuration to serve traffic loads at different times of the day while maximising the use of opportunistic sleep modes by relays in conjunction with cell zooming, thereby saving energy. The configuration...
LTE radio and network planning: Basic coverage and interference constraints
Velez, Fernando J.; Robalo, Daniel; Acevedo Flores, JessicaIn the cellular planning process, the UL and DL the values from carrier-to-noise-plus-interference ratio (CNIR) from/at the mobile station are very important parameters. From a detailed analysis of its variation with the coverage and reuse distances for different values of the Chanel Quality Indicator (CQI) and given empirical propagation models, an evaluation of the possible range for the reuse pattern is perf...
Economic trade-off in the optimization of carrier aggregation with enhanced mul...
Robalo, Daniel; Velez, FernandoThis work proposes Long Term Evolution-Advanced (LTE-A) integrated Common Radio Resource Management (iCRRM) for inter-band carrier aggregation (CA) between band 7 (2.6 GHz) and band 20 (800 MHz), considering bandwidths of 5 and 20 MHz. The iCRRM entity performs component carrier (CC) scheduling and increases user’s quality of service and experience while considering mobile video traffic. The performance from a ...
Transmitted Power Formulation for the Optimization of Spectrum Aggregation in L...
Acevedo Flores, Jessica Elizabeth; Robalo, Daniel; Velez, Fernando J.This work starts by proposing a formulation to calculate the transmitter power needed to cover cells of different sizes, whilst maintaining the average signal to interference-plus-noise ratio constant, and near the maximum, for two Long Term Evolution (LTE) systems operating over non-contiguous frequency bands, 800 MHz and 2 GHz, with an integrated common radio resource management (iCRRM) entity. In the context...
A Model for Mapping between the Quality of Service and Experience for Wireless ...
Robalo, Daniel; Velez, Fernando J.With nowadays evolution of wireless network technologies and the growth of novel wireless multimedia services it is critical for network and service providers to be able to assess user's perceptual multimedia quality, for commercial and technical reasons. As so, we present wireless network services and applications characterization requirements, updated to current specifications. We considered recommendations f...