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Beltramelli, Luca
Publications (5 of 5) Show all publications
Beltramelli, L., Mahmood, A., Gidlund, M., Österberg, P. & Jennehag, U. (2018). Interference Modelling in a Multi-Cell LoRa System. In: 2018 14th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob): . Paper presented at The 14th International Conference on Wireless and Mobile Computing, Networking and Communications, Limassol, Cyprus, October 15-17, 2018. IEEE
Open this publication in new window or tab >>Interference Modelling in a Multi-Cell LoRa System
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2018 (English)In: 2018 14th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), IEEE, 2018Conference paper, Published paper (Refereed)
Abstract [en]

As the market for low-power wide-area network (LPWAN) technologies expands and the number of connected devices increases, it is becoming important to investigate the performance of LPWAN candidate technologies in dense deployment scenarios. In dense deployments, where the networks usually exhibit the traits of an interference-limited system, a detailed intra- and inter-cell interference analysis of LPWANs is required. In this paper, we model and analyze the performance of uplink communication of a LoRa link in a multi-cell LoRa system. To such end, we use mathematical tools from stochastic geometry and geometric probability to model the spatial distribution of LoRa devices. The model captures the effects of the density of LoRa cells and the allocation of quasi-orthogonal spreading factors (SF) on the success probability of the LoRa transmissions. To account for practical deployment of LoRa gateways, we model the spatial distribution of the gateways with a Poisson point process (PPP) and Matèrn hard-core point process (MHC). Using our analytical formulation, we find the uplink performance in terms of success probability and potential throughput for each of the available SF in LoRa’s physical layer. Our results show that in dense multi-cell LoRa deployment with uplink traffic, the intercell interference noticeably degrades the system performance.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
stochastic geometry, interference modelling, LoRa
National Category
Communication Systems Computer Systems Telecommunications
Identifiers
urn:nbn:se:miun:diva-34715 (URN)10.1109/WiMOB.2018.8589100 (DOI)000459858400010 ()2-s2.0-85060784032 (Scopus ID)978-1-5386-6876-4 (ISBN)
Conference
The 14th International Conference on Wireless and Mobile Computing, Networking and Communications, Limassol, Cyprus, October 15-17, 2018
Projects
TIMELINESS
Funder
Knowledge Foundation
Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2019-03-19Bibliographically approved
Beltramelli, L., Guntupalli, L., Gidlund, M., Österberg, P. & Jennehag, U. (2018). Modeling of Enhanced Distributed Channel Access with Station Grouping: A Throughput Analysis. In: Proc. IEEE 88th Vehicular Technology Conference (VTC'18-fall), Chicago, USA, Aug. 2018.: . Paper presented at IEEE 88th Vehicular Technology Conference (VTC'18-fall), Chicago, USA, 27-30 Aug. 2018. IEEE conference proceedings, Article ID 8690814.
Open this publication in new window or tab >>Modeling of Enhanced Distributed Channel Access with Station Grouping: A Throughput Analysis
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2018 (English)In: Proc. IEEE 88th Vehicular Technology Conference (VTC'18-fall), Chicago, USA, Aug. 2018., IEEE conference proceedings, 2018, article id 8690814Conference paper, Published paper (Refereed)
Abstract [en]

Machine to Machine (M2M) communication networksare expected to connect a large number of power constrained devices in long range applications with differentquality of service (QoS) requirements. Medium access control with QoS support such as the Enhanced Distributed Channel Access (EDCA) defined by IEEE 802.11e provides traffic differentiation and corresponding priority classes, which guarantees QoSaccording to the needs of applications. In this paper, we employa station grouping mechanism for enhancing the scalability of EDCA to handle the massive number of access attempts expected in large M2M networks. Furthermore, we develop a discrete time Markov chain (DTMC) model to analyze the performance of EDCA with station grouping. Using the developed DTMC model, we calculate throughput for each access category as well as for different combinations of grouping and EDCA parameters. Thenumerical results show that the model can precisely reveal the behavior of EDCA mechanism. Moreover, it is demonstrated that employing the proposed grouping mechanism for EDCA increasesthe normalized throughput significantly for all classes of priority.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2018
Keywords
EDCA, IEEE 802.11e, Grouping, Throughput
National Category
Computer Engineering Communication Systems Telecommunications
Identifiers
urn:nbn:se:miun:diva-34526 (URN)10.1109/VTCFall.2018.8690814 (DOI)2-s2.0-85064912874 (Scopus ID)
Conference
IEEE 88th Vehicular Technology Conference (VTC'18-fall), Chicago, USA, 27-30 Aug. 2018
Projects
TIMELINESSSMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Funder
Knowledge Foundation
Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-09-09Bibliographically approved
Baswade, A. M., Beltramelli, L., Antony, F. A., Gidlund, M., Reddy Tamma, B. & Guntupalli, L. (2018). Modelling and Analysis of Wi-Fi and LAA Coexistence with Priority Classes. In: 2018 14th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob): . Paper presented at The 14th International Conference on Wireless and Mobile Computing, Networking and Communications, Limassol, Cyprus, during October, 2018.. IEEE
Open this publication in new window or tab >>Modelling and Analysis of Wi-Fi and LAA Coexistence with Priority Classes
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2018 (English)In: 2018 14th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), IEEE, 2018Conference paper, Published paper (Refereed)
Abstract [en]

The Licensed Assisted Access (LAA) is shown asa required technology to avoid overcrowding of the licensedbands by the increasing cellular traffic. Proposed by 3GPP,LAA uses a Listen Before Talk (LBT) and backoff mechanismsimilar to Wi-Fi. While many mathematical models have beenproposed to study the problem of the coexistence of LAAand Wi-Fi systems, few have tackled the problem of QoSprovisioning, and in particular analysed the behaviour of thevarious classes of priority available in Wi-Fi and LAA. Thispaper presents a new mathematical model to investigate theperformance of different priority classes in coexisting Wi-Fi andLAA networks. Using Discrete Time Markov Chains, we modelthe saturation throughput of all eight priority classes used byWi-Fi and LAA. The numerical results show that with the 3GPPproposed parameters, a fair coexistence between Wi-Fi and LAAcannot be achieved. Wi-Fi users in particular suffer a significantdegradation of their performance caused by the collision withLAA transmissions which has a longer duration compared toWi-Fi transmissions.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
EDCA, Wi-Fi, Coexistence, QoS, LAA
National Category
Communication Systems
Identifiers
urn:nbn:se:miun:diva-34717 (URN)10.1109/WiMOB.2018.8589150 (DOI)000459858400038 ()2-s2.0-85060783880 (Scopus ID)978-1-5386-6876-4 (ISBN)
Conference
The 14th International Conference on Wireless and Mobile Computing, Networking and Communications, Limassol, Cyprus, during October, 2018.
Projects
TIMELINESSSMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Funder
Knowledge Foundation
Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2019-09-09Bibliographically approved
Beltramelli, L., Österberg, P., Jennehag, U. & Gidlund, M. (2017). Hybrid MAC Mechanism for Energy Efficient Communication in IEEE 802.11ah. In: Proceedings of the 2017 IEEE International Conference on Industrial Technology (ICIT): . Paper presented at 18th IEEE International Conference on Industrial Technology (ICIT'17), Toronto, Canada, March 2017. (pp. 1295-1300). IEEE, Article ID 7915550.
Open this publication in new window or tab >>Hybrid MAC Mechanism for Energy Efficient Communication in IEEE 802.11ah
2017 (English)In: Proceedings of the 2017 IEEE International Conference on Industrial Technology (ICIT), IEEE, 2017, p. 1295-1300, article id 7915550Conference paper, Published paper (Refereed)
Abstract [en]

Many applications for machine-to-machine (M2M) communications are characterized by large numbers of devices with sporadic transmissions and subjected to low energy budgets. This work addresses the importance of energy consumption by proposing a new Medium Access Control (MAC) mechanism for improving the energy efficiency of IEEE 802.11ah, a standard targeting M2M communication. We propose to use the features of IEEE 802.11ah MAC to realize a hybrid contention-reservation mechanism for the transmission of uplink traffic. In the proposed mechanism, any device with a buffered packet will first notify the Access Point (AP) during a contention phase before being given a reserved timeslot for the data transmission. We develop a mathematical model to analyse the energy consumption ofthe proposed mechanism and of IEEE 802.11ah. The results show that for a monitoring scenario, the proposed contention reservation mechanism reduces the energy consumption for a successful uplink data transmission by up to 55%.

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
Energy efficiency, IEEE 802.11ah, M2M communication, MAC protocol, RAW.
National Category
Communication Systems Telecommunications Computer Engineering
Identifiers
urn:nbn:se:miun:diva-30601 (URN)10.1109/ICIT.2017.7915550 (DOI)000404252400214 ()2-s2.0-85019602445 (Scopus ID)STC (Local ID)978-1-5090-5320-9 (ISBN)STC (Archive number)STC (OAI)
Conference
18th IEEE International Conference on Industrial Technology (ICIT'17), Toronto, Canada, March 2017.
Projects
M2M COMM
Funder
Knowledge Foundation
Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2018-01-13Bibliographically approved
Beltramelli, L. & Österberg, P. (2016). Modelling of EnergyConsumption in IEEE 802.11.ah Networks for M2M Traffic. In: Proceedings of SNCNW 2016: The 12th Swedish National Computer Networking Workshop. Paper presented at Swedish National Computer Networking Workshop, Sundsvall, June 1-2, 2016 (pp. 38-41).
Open this publication in new window or tab >>Modelling of EnergyConsumption in IEEE 802.11.ah Networks for M2M Traffic
2016 (English)In: Proceedings of SNCNW 2016: The 12th Swedish National Computer Networking Workshop, 2016, p. 38-41Conference paper, Published paper (Refereed)
Abstract [en]

IEEE 802.11ah is a sub-1 GHz standard designed to meet the requirements of future machine-to-machine (M2M) communications. The standard should be able to support use cases for the M2M communications with thousands of stations capable of generating both periodic and aperiodic traffic for a single access point. In some cases, like environmental and agricultural monitoring. the nodes are typically powered by battery or through energy harvesting. For this application it is important for the communication to be energy efficient. IEEE 802.11ah introduces new energy saving mechanisms and a novel channel access mechanism to achieve this objective even for networks with a large nodes number. This work proposes a mathematical model to compute the energy consumption of an IEEE 802.11ah network.

National Category
Communication Systems
Identifiers
urn:nbn:se:miun:diva-33118 (URN)
Conference
Swedish National Computer Networking Workshop, Sundsvall, June 1-2, 2016
Projects
Reliable and secure M2M communication in smart grid networks
Funder
Knowledge Foundation, 20140319
Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2018-11-06Bibliographically approved
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