IT-UBI - Instituto de Telecomunicações
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The IT – Covilhã is a research unit of the IT (Instituto de Telecomunicações, Pole of Coimbra). It is hosted by Faculty of Engineering, University of Beira Interior, and where about 20 faculty members and 40 researchers develop their research activities in seven major topics: Computer Graphics and Multimedia; Mobile; Technologies and Telecommunications; Network and Multimedia Computing; Soft Computing and Image Analysis; Next Generation Networks and Applications; Applied Mathematics; Power Systems.
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Browsing IT-UBI - Instituto de Telecomunicações by Author "Acevedo Flores, Jessica"
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- Fundamental Limits for LTE Radio and Network PlanningPublication . 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 reuse distances for different modulation and coding schemes (MCS) and given empirical propagation models, an evaluation of the possible range for the reuse pattern is performed. By considering the CQI and reference CNIR requirements recommended by 3GPP. DL peak bit rates along with the Transport Block Size (TBS) assumed for single stream and bandwidth of 5 MHz, physical and supported throughputs are analysed. These formulations shows the clear decrease of the supported throughput for the longest coverage distances in the LTE 2.6 GHz band, a behaviour that is not so clear at 800 MHz, and gives hints to the optimization of the use of different frequency bands in the optimization of carrier aggregation between two different bands in LTE-A scenarios.
- LTE radio and network planning: Basic coverage and interference constraintsPublication . 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 performed for the DL. By considering the CQI and reference CNIR requirements recommended by 3GPP, DL peak bit rates along with the Transport Block Size (TBS) assumed for single stream and bandwidth of 5 MHz, physical and supported throughputs are analysed. These formulations shows the clear decrease of the supported throughput for the longest coverage distances in the LTE 2.6 GHz band, a behaviour that is not so clear at 800 MHz, and gives useful indications to the optimization of the use of different frequency bands in the optimization of carrier aggregation between two different bands in LTE-A scenarios.
- LTE-Advanced Radio and Network Optimization: Basic Coverage and Interference ConstraintsPublication . 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 performed for the DL. By considering CQI and reference CNIR requirements recommended by 3GPP, DL peak bit rates along with the Transport Block Size assumed for single stream and bandwidths of 10 and 20 MHz, PHY and supported throughputs are analysed. HetNets with Carrier Aggregation are considered, where macro cells operating at 800 MHz provide coverage and small cells (SCs) operating at 2.6 GHz provide throughput enhancement at hotspots. A clear decrease is shown for the supported throughput for the longest coverage distances in NLoS propagation conditions. In the given range of coverage distances, the same maximum value occurs for the supported throughput for K=3 and 7, both for macro and SCs.