Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249281
Boris Malčić, G. Gardasevic, S. Sajic
In this paper, we propose a novel algorithm for increasing energy efficiency of individual IEEE 802.11 WAPs (Wi-Fi Access Points). The algorithm is trained based on monitoring Traffic Flow, Clients/Subscribers Flow and RF coverage map Flow, using cross-correlation to determine the optimal Traffic Level Filling by WAPs during the observed time period. WAPs are managed by central monitoring system to increase the energy efficiency. The proposed algorithm enables a significant percentage increase in energy efficiency for IEEE 802.11 WAPs systems.
{"title":"A new algorithm for energy-efficient IEEE 802.11 access points","authors":"Boris Malčić, G. Gardasevic, S. Sajic","doi":"10.1109/TELFOR.2017.8249281","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249281","url":null,"abstract":"In this paper, we propose a novel algorithm for increasing energy efficiency of individual IEEE 802.11 WAPs (Wi-Fi Access Points). The algorithm is trained based on monitoring Traffic Flow, Clients/Subscribers Flow and RF coverage map Flow, using cross-correlation to determine the optimal Traffic Level Filling by WAPs during the observed time period. WAPs are managed by central monitoring system to increase the energy efficiency. The proposed algorithm enables a significant percentage increase in energy efficiency for IEEE 802.11 WAPs systems.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132955651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249293
Ufuk Altun, S. T. Basaran, Hakan Alakoca, G. Kurt
Traditional wireless sensor network applications separate the functionalities for communication and computation. However, through simultaneous transmission and superposition property, multiple access wireless channels can enable joint communication and computation. Recent studies successfully highlight the benefit that can be harnessed from the wireless transmission channel in order to improve the network throughput and to reduce the computational load. In this paper, the usage of analog function computation (AFC) strategy is studied to combine communication and computation as a case study targeting a wireless sensor network. The proposed network executes summation, multiplication, maximum and minimum operations on channel with the help of pre-processing and post-processing functions. Mathematical model of the network is supported with computer simulations and the obtained benefits when compared to a time division multiple access (TDMA) based transmission scheme are highlighted. The real-time implementation of the sensor network is achieved by using software defined radio (SDR) nodes and extensive tests are run for summation operation in order to investigate the performance of the network.
{"title":"A testbed based verification of joint communication and computation systems","authors":"Ufuk Altun, S. T. Basaran, Hakan Alakoca, G. Kurt","doi":"10.1109/TELFOR.2017.8249293","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249293","url":null,"abstract":"Traditional wireless sensor network applications separate the functionalities for communication and computation. However, through simultaneous transmission and superposition property, multiple access wireless channels can enable joint communication and computation. Recent studies successfully highlight the benefit that can be harnessed from the wireless transmission channel in order to improve the network throughput and to reduce the computational load. In this paper, the usage of analog function computation (AFC) strategy is studied to combine communication and computation as a case study targeting a wireless sensor network. The proposed network executes summation, multiplication, maximum and minimum operations on channel with the help of pre-processing and post-processing functions. Mathematical model of the network is supported with computer simulations and the obtained benefits when compared to a time division multiple access (TDMA) based transmission scheme are highlighted. The real-time implementation of the sensor network is achieved by using software defined radio (SDR) nodes and extensive tests are run for summation operation in order to investigate the performance of the network.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133079567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249433
Kosa R. Nenadić, Milan Gavric, Vladimir I. Đurđević
In this paper, we analyze an application of the W3C's Shapes Constraint Language (SHACL) on the Common Information Model (CIM) for validation purposes. A mapping of CIM RDF Schema into SHACL shapes is defined and an SHACL implementation is made. The CGMES profiles and test configuration provided by ENTSO-E were used for evaluation. In an iterative validation process, required enhancements of CIM datasets were defined. A novel approach for validation of CIM datasets is proposed.
{"title":"Validation of CIM datasets using SHACL","authors":"Kosa R. Nenadić, Milan Gavric, Vladimir I. Đurđević","doi":"10.1109/TELFOR.2017.8249433","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249433","url":null,"abstract":"In this paper, we analyze an application of the W3C's Shapes Constraint Language (SHACL) on the Common Information Model (CIM) for validation purposes. A mapping of CIM RDF Schema into SHACL shapes is defined and an SHACL implementation is made. The CGMES profiles and test configuration provided by ENTSO-E were used for evaluation. In an iterative validation process, required enhancements of CIM datasets were defined. A novel approach for validation of CIM datasets is proposed.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114327326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249289
S. R. Aldaeabool, M. Abbod
In this paper, a new power consumption model for Cloud Radio Access Network (C-RAN) architecture based on virtualization of Base Band Unit (BBU) has been introduced. Moreover, it is proposed a Host Server (HS) in the BBU pool that hosts a Modified Best Fit Decreasing (MBFD) algorithm to optimize reconfiguration of BBUs to proper Remote Radio Heads (RRHs). The simulation results show the MBFD effectively better in decreasing the number of active BBUs and decrease power consumption compared with Best Fit Decreasing (BFD) algorithm and traditional network.
本文介绍了一种基于基带单元(BBU)虚拟化的云无线接入网(C-RAN)架构的新功耗模型。此外，还在BBU池中提出了一个主机服务器(HS)，该服务器承载了一种改进的最佳拟合减少(MBFD)算法，以优化BBU重新配置为合适的远程无线电头(RRHs)。仿真结果表明，与传统网络和最佳拟合减少(Best Fit reduction, BFD)算法相比，MBFD在减少活动bbu数量和降低功耗方面具有更好的效果。
{"title":"Reducing power consumption by dynamic BBUs-RRHs allocation in C-RAN","authors":"S. R. Aldaeabool, M. Abbod","doi":"10.1109/TELFOR.2017.8249289","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249289","url":null,"abstract":"In this paper, a new power consumption model for Cloud Radio Access Network (C-RAN) architecture based on virtualization of Base Band Unit (BBU) has been introduced. Moreover, it is proposed a Host Server (HS) in the BBU pool that hosts a Modified Best Fit Decreasing (MBFD) algorithm to optimize reconfiguration of BBUs to proper Remote Radio Heads (RRHs). The simulation results show the MBFD effectively better in decreasing the number of active BBUs and decrease power consumption compared with Best Fit Decreasing (BFD) algorithm and traditional network.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114573509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249430
Jovan Popovic, Nenad Korolija, Ž. Marković, D. Bojic
The Use Case Point method of effort estimation in software projects quantifies project size based on both functional and non-functional requirements. The latter ones are hard to assess and therefore often neglected. This paper presents a methodology for assessing the influence of non-functional requirements on the overall estimate. Two data sets of software projects are used for comparing the correlation between unadjusted and adjusted use case weights. Based on the results, the guidelines for software development effort estimation are concluded.
{"title":"The influence of non-functional requirements in UCP method on the accuracy of effort estimates","authors":"Jovan Popovic, Nenad Korolija, Ž. Marković, D. Bojic","doi":"10.1109/TELFOR.2017.8249430","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249430","url":null,"abstract":"The Use Case Point method of effort estimation in software projects quantifies project size based on both functional and non-functional requirements. The latter ones are hard to assess and therefore often neglected. This paper presents a methodology for assessing the influence of non-functional requirements on the overall estimate. Two data sets of software projects are used for comparing the correlation between unadjusted and adjusted use case weights. Based on the results, the guidelines for software development effort estimation are concluded.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"78 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132772348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249380
Y. Aşçı, M. Pehlivan, K. Yeğin
Circular waveguide to dual-cavity transition is proposed for wideband, high gain, high aperture efficiency and low profile (60.6mm) antenna. Target bandwidth is Ku band downlink and uplink frequency bands. Simulation result shows 40% (10–15GHz) fractional bandwidth at VSWR<1.5. Propose antenna has minimum 11.3 dBi gain at downlink band and minimum 12.4 dBi at uplink band. Aperture efficiency is better than 65% throughout the band. The structure offers a good alternative to standard gain horn antennas but with much less antenna profile. It can be used in phased array applications as well.
{"title":"Dual cavity Ku-band antenna for SatCom applications","authors":"Y. Aşçı, M. Pehlivan, K. Yeğin","doi":"10.1109/TELFOR.2017.8249380","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249380","url":null,"abstract":"Circular waveguide to dual-cavity transition is proposed for wideband, high gain, high aperture efficiency and low profile (60.6mm) antenna. Target bandwidth is Ku band downlink and uplink frequency bands. Simulation result shows 40% (10–15GHz) fractional bandwidth at VSWR<1.5. Propose antenna has minimum 11.3 dBi gain at downlink band and minimum 12.4 dBi at uplink band. Aperture efficiency is better than 65% throughout the band. The structure offers a good alternative to standard gain horn antennas but with much less antenna profile. It can be used in phased array applications as well.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116671173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249277
Natasa Banovic-Curguz, D. Ilišević
The development of every new generation of wireless communications begins with increased requirements for speed and capacity. In addition to the above, the 5G (5th generation) systems must also satisfy new scenarios of using very different requirements, including various ways of communicating the devices. Several research initiatives address the issues of regulation and standardization in this area. In this paper, we gave a brief overview of research on future 5G systems, the requirements they are facing, user scenarios, functionalities, and KPIs (Key Performance Indicators) as a measure of assessing the performances of these systems.
{"title":"Trends of digital society development towards 5G technology","authors":"Natasa Banovic-Curguz, D. Ilišević","doi":"10.1109/TELFOR.2017.8249277","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249277","url":null,"abstract":"The development of every new generation of wireless communications begins with increased requirements for speed and capacity. In addition to the above, the 5G (5th generation) systems must also satisfy new scenarios of using very different requirements, including various ways of communicating the devices. Several research initiatives address the issues of regulation and standardization in this area. In this paper, we gave a brief overview of research on future 5G systems, the requirements they are facing, user scenarios, functionalities, and KPIs (Key Performance Indicators) as a measure of assessing the performances of these systems.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130263247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249455
D. Sutic, E. Varga
We propose an architecture that aims to improve the execution times of compute intensive calculations that are part of prominent power system analysis functions. The approach uses the distributed framework Apache Spark to target the common problems in linear algebra, like the solving of a matrix equation, that increase the complexity of said functions. Our analysis focuses on the load flow study as a common and important procedure that could benefit from distributed computing.
{"title":"Apache spark as distributed middleware for power system analysis","authors":"D. Sutic, E. Varga","doi":"10.1109/TELFOR.2017.8249455","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249455","url":null,"abstract":"We propose an architecture that aims to improve the execution times of compute intensive calculations that are part of prominent power system analysis functions. The approach uses the distributed framework Apache Spark to target the common problems in linear algebra, like the solving of a matrix equation, that increase the complexity of said functions. Our analysis focuses on the load flow study as a common and important procedure that could benefit from distributed computing.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127053449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249272
A. Prasad, Zexian Li, S. Holtmanns, M. Uusitalo
The demand for wireless information exchange in the form of data and multimedia content has been growing exponentially over the past few years, and the trends are expected to persist for the future. Due to the continued growth in demand and support required for new use cases and features, currently the fifth generation (5G) of mobile networks are being developed. We build on top of the concept of micro-operators and discuss the use of cloud-based deployments to enable connectivity and service provisioning in the new paradigms. The use of such networks for supporting new application and services from verticals, related challenges and impacts on network security and the regulatory support from new spectrum regimes are also discussed. Performance issues and optimization approaches are outlined to enable a fast and efficient deployment of 5G networks which are suitable for new verticals and markets, providing tailored services and applications.
{"title":"5G micro-operator networks — A key enabler for new verticals and markets","authors":"A. Prasad, Zexian Li, S. Holtmanns, M. Uusitalo","doi":"10.1109/TELFOR.2017.8249272","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249272","url":null,"abstract":"The demand for wireless information exchange in the form of data and multimedia content has been growing exponentially over the past few years, and the trends are expected to persist for the future. Due to the continued growth in demand and support required for new use cases and features, currently the fifth generation (5G) of mobile networks are being developed. We build on top of the concept of micro-operators and discuss the use of cloud-based deployments to enable connectivity and service provisioning in the new paradigms. The use of such networks for supporting new application and services from verticals, related challenges and impacts on network security and the regulatory support from new spectrum regimes are also discussed. Performance issues and optimization approaches are outlined to enable a fast and efficient deployment of 5G networks which are suitable for new verticals and markets, providing tailored services and applications.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1109/TELFOR.2017.8249407
Arnis Salmins, J. Judvaitis, Rihards Balass, K. Nesenbergs
When developing a wireless sensor network or embedded device debugging and testing is a time consuming and complex process. It involves tedious routine works, especially when testing is done in real-world environment. To make things worse, simulations and emulations are not sufficient for deployment of new embedded devices, since they are too far from ever changing real world conditions. Some of those problems are solved by testbeds, allowing to increase the prototyping speed by quite a margin, but testbeds still operate in some-what semi real-world conditions due to limited mobility of testbed nodes. In this paper authors present an approach to provide testbed functionality in real-world environment without making any sacrifices on functionality. Authors provide the implementation and evaluation of mobile nodes proving that they can be used to prototype embedded devices in actual real-world scenarios while using all the functionality a stationary testbed provides.
{"title":"Mobile wireless sensor network TestBed","authors":"Arnis Salmins, J. Judvaitis, Rihards Balass, K. Nesenbergs","doi":"10.1109/TELFOR.2017.8249407","DOIUrl":"https://doi.org/10.1109/TELFOR.2017.8249407","url":null,"abstract":"When developing a wireless sensor network or embedded device debugging and testing is a time consuming and complex process. It involves tedious routine works, especially when testing is done in real-world environment. To make things worse, simulations and emulations are not sufficient for deployment of new embedded devices, since they are too far from ever changing real world conditions. Some of those problems are solved by testbeds, allowing to increase the prototyping speed by quite a margin, but testbeds still operate in some-what semi real-world conditions due to limited mobility of testbed nodes. In this paper authors present an approach to provide testbed functionality in real-world environment without making any sacrifices on functionality. Authors provide the implementation and evaluation of mobile nodes proving that they can be used to prototype embedded devices in actual real-world scenarios while using all the functionality a stationary testbed provides.","PeriodicalId":422501,"journal":{"name":"2017 25th Telecommunication Forum (TELFOR)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127711116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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