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Author

Johan Torsner

Other affiliations: Royal Institute of Technology
Bio: Johan Torsner is an academic researcher from Ericsson. The author has contributed to research in topics: Communications system & Network packet. The author has an hindex of 36, co-authored 163 publications receiving 5957 citations. Previous affiliations of Johan Torsner include Royal Institute of Technology.


Papers
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Journal ArticleDOI
TL;DR: The present paper analyzes in detail the potential of 5G technologies for the IoT, by considering both the technological and standardization aspects and illustrates the massive business shifts that a tight link between IoT and 5G may cause in the operator and vendors ecosystem.
Abstract: The IoT paradigm holds the promise to revolutionize the way we live and work by means of a wealth of new services, based on seamless interactions between a large amount of heterogeneous devices. After decades of conceptual inception of the IoT, in recent years a large variety of communication technologies has gradually emerged, reflecting a large diversity of application domains and of communication requirements. Such heterogeneity and fragmentation of the connectivity landscape is currently hampering the full realization of the IoT vision, by posing several complex integration challenges. In this context, the advent of 5G cellular systems, with the availability of a connectivity technology, which is at once truly ubiquitous, reliable, scalable, and cost-efficient, is considered as a potentially key driver for the yet-to emerge global IoT. In the present paper, we analyze in detail the potential of 5G technologies for the IoT, by considering both the technological and standardization aspects. We review the present-day IoT connectivity landscape, as well as the main 5G enablers for the IoT. Last but not least, we illustrate the massive business shifts that a tight link between IoT and 5G may cause in the operator and vendors ecosystem.

1,224 citations

Journal ArticleDOI
TL;DR: Promising technologies to fulfil 3G evolution targets are presented, including OFDM, multi-antenna solutions, evolved QoS and link layer concepts, and an evolved architecture, indicating that the requirements can indeed be reached using the proposed technologies.
Abstract: Work has started in the 3GPP to define a long-term evolution for 3G, sometimes referred to as super-3G, which will stretch the performance of 3G technology, thereby meeting user expectations in a 10-year perspective and beyond. The fundamental targets of this evolution - to further reduce user and operator costs and to improve service provisioning - will be met through improved coverage and system capacity as well as increased data rates and reduced latency. This article presents promising technologies to fulfil these targets, including OFDM, multi-antenna solutions, evolved QoS and link layer concepts, and an evolved architecture. Furthermore, the results of a performance evaluation are presented, indicating that the requirements can indeed be reached using the proposed technologies.

567 citations

Patent
Stefan Parkvall1, Janne Peisa1, Gunnar Mildh1, Robert Baldemair1, Stefan Wager1, Jonas Kronander1, Karl Werner1, Richard Abrahamsson1, Ismet Aktas1, Peter Alriksson1, Junaid Ansari1, Ashraf Shehzad Ali1, Henrik Asplund1, Fredrik Athley1, Håkan Axelsson1, Joakim Axmon1, Johan Axnäs1, Kumar Balachandran1, Gunnar Bark1, Jan-Erik Berg1, Andreas Bergström1, Håkan Björkegren1, Nadia Brahmi1, Cagatay Capar1, Anders Carlsson1, Andreas Cedergren1, Mikael Coldrey1, Icaro L. J. da Silva1, Erik Dahlman1, Ali El Essaili1, Ulrika Engström1, Mårten Ericson1, Erik Eriksson1, Mikael Fallgren1, Fan Rui1, Gabor Fodor1, Pål Frenger1, Jonas Fridén1, Jonas Fröberg Olsson1, Anders Furuskär1, Johan Furuskog1, Virgile Garcia1, Ather Gattami1, Fredrik Gunnarsson1, Ulf Gustavsson1, Bo Hagerman1, Fredrik Harrysson1, Ning He1, Martin Hessler1, Kimmo Hiltunen1, Song-Nam Hong1, Dennis Hui1, Jörg Huschke1, Tim Irnich1, Sven Jacobsson1, Niklas Jaldén1, Simon Järmyr1, Zhiyuan Jiang1, Martin Johansson1, Niklas Johansson1, Du Ho Kang1, Eleftherios Karipidis1, Patrik Karlsson1, Ali S. Khayrallah1, Caner Kilinc1, Göran N. Klang1, Sara Landström1, Christina Larsson1, Gen Li1, Lars Lindbom1, Robert Lindgren1, Bengt Lindoff1, Fredrik Lindqvist1, Liu Jinhua1, Thorsten Lohmar1, Qianxi Lu1, Lars Manholm1, Ivana Maric1, Jonas Medbo1, Qingyu Miao1, Reza Moosavi1, Walter Müller1, Elena Myhre1, Karl Norrman1, Bengt-Erik Olsson1, Torgny Palenius1, Sven Petersson1, Jose Luis Pradas1, Mikael Prytz1, Olav Queseth1, Pradeepa Ramachandra1, Edgar Ramos1, Andres Reial1, Thomas Rimhagen1, Emil Ringh1, Patrik Rugeland1, Johan Rune1, Joachim Sachs1, Henrik Sahlin1, Vidit Saxena1, Nima Seifi1, Yngve Selén1, Eliane Semaan1, Sachin Sharma1, Shi Cong1, Johan Sköld1, Magnus Stattin1, Anders Stjernman1, Dennis Sundman1, Lars Sundström1, Miurel Isabel Tercero Vargas1, Claes Tidestav1, Sibel Tombaz1, Johan Torsner1, Hugo Tullberg1, Jari Vikberg1, Peter von Wrycza1, Thomas Walldeen1, Pontus Wallentin1, Wang Hai1, Ke Wang Helmersson1, Wang Jianfeng1, Yi-Pin Eric Wang1, Niclas Wiberg1, Wittenmark Emma1, Osman Nuri Can Yilmaz1, Ali A. Zaidi1, Zhang Zhan1, Zhang Zhang1, Zheng Yanli1 
13 May 2016
TL;DR: In this article, the uplink access configuration index is used to identify an uplink AP from among a predetermined plurality of AP configurations, and then the AP is transmitted to the wireless communications network according to the identified AP.
Abstract: Methods and apparatus in a fifth-generation wireless communications, including an example method, in a wireless device, that includes receiving a downlink signal comprising an uplink access configuration index, using the uplink access configuration index to identify an uplink access configuration from among a predetermined plurality of uplink access configurations, and transmitting to the wireless communications network according to the identified uplink access configuration. The example method further includes, in the same wireless device, receiving, in a first subframe, a first Orthogonal Frequency-Division Multiplexing (OFDM) transmission formatted according to a first numerology and receiving, in a second subframe, a second OFDM transmission formatted according to a second numerology, the second numerology differing from the first numerology. Variants of this method, corresponding apparatuses, and corresponding network-side methods and apparatuses are also disclosed.

453 citations

Journal ArticleDOI
TL;DR: In this paper, the authors comprehensively review the most prominent existing and novel M2M radio technologies, as well as share their first-hand real-world deployment experiences, with the goal to provide a unified insight into enabling machine-to-machine architectures, unique technology features, expected performance, and related standardization developments.
Abstract: This article addresses the market-changing phenomenon of the Internet of Things (IoT), which relies on the underlying paradigm of machine-to-machine (M2M) communications to integrate a plethora of various sensors, actuators, and smart meters across a wide spectrum of businesses. Today the M2M landscape features an extreme diversity of available connectivity solutions which, due to the enormous economic promise of the IoT, need to be harmonized across multiple industries. To this end, we comprehensively review the most prominent existing and novel M2M radio technologies, as well as share our first-hand real-world deployment experiences, with the goal to provide a unified insight into enabling M2M architectures, unique technology features, expected performance, and related standardization developments. We pay particular attention to the cellular M2M sector employing 3GPP LTE technology. This work is a systematic recollection of our many recent research, industrial, entrepreneurial, and standardization efforts within the contemporary M2M ecosystem.

279 citations

Journal ArticleDOI
TL;DR: A thorough overview of this protocol stack, including the sub-layers and corresponding interactions in between them, in a manner that is more intuitive than in the respective 3GPP specifications is provided.
Abstract: The LTE radio interface for 3GPP Release 8 was specified recently. This article describes the LTE link-layer protocols, which abstract the physical layer and adapt its characteristics to match the requirements of higher layer protocols. The LTE link-layer protocols are optimized for low delay and low overhead and are simpler than their counterparts in UTRAN. The state of- the-art LTE protocol design is the result of a careful crosslayer approach where the protocols interact with each other efficiently. This article provides a thorough overview of this protocol stack, including the sub-layers and corresponding interactions in between them, in a manner that is more intuitive than in the respective 3GPP specifications.

276 citations


Cited by
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Journal ArticleDOI
TL;DR: The concepts of IoT, Industrial IoT, and Industry 4.0 are clarified and the challenges associated with the need of energy efficiency, real-time performance, coexistence, interoperability, and security and privacy are focused on.
Abstract: Internet of Things (IoT) is an emerging domain that promises ubiquitous connection to the Internet, turning common objects into connected devices. The IoT paradigm is changing the way people interact with things around them. It paves the way for creating pervasively connected infrastructures to support innovative services and promises better flexibility and efficiency. Such advantages are attractive not only for consumer applications, but also for the industrial domain. Over the last few years, we have been witnessing the IoT paradigm making its way into the industry marketplace with purposely designed solutions. In this paper, we clarify the concepts of IoT, Industrial IoT, and Industry 4.0. We highlight the opportunities brought in by this paradigm shift as well as the challenges for its realization. In particular, we focus on the challenges associated with the need of energy efficiency, real-time performance, coexistence, interoperability, and security and privacy. We also provide a systematic overview of the state-of-the-art research efforts and potential research directions to solve Industrial IoT challenges.

1,402 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive tutorial on the potential benefits and applications of UAVs in wireless communications is presented, and the important challenges and the fundamental tradeoffs in UAV-enabled wireless networks are thoroughly investigated.
Abstract: The use of flying platforms such as unmanned aerial vehicles (UAVs), popularly known as drones, is rapidly growing. In particular, with their inherent attributes such as mobility, flexibility, and adaptive altitude, UAVs admit several key potential applications in wireless systems. On the one hand, UAVs can be used as aerial base stations to enhance coverage, capacity, reliability, and energy efficiency of wireless networks. On the other hand, UAVs can operate as flying mobile terminals within a cellular network. Such cellular-connected UAVs can enable several applications ranging from real-time video streaming to item delivery. In this paper, a comprehensive tutorial on the potential benefits and applications of UAVs in wireless communications is presented. Moreover, the important challenges and the fundamental tradeoffs in UAV-enabled wireless networks are thoroughly investigated. In particular, the key UAV challenges such as 3D deployment, performance analysis, channel modeling, and energy efficiency are explored along with representative results. Then, open problems and potential research directions pertaining to UAV communications are introduced. Finally, various analytical frameworks and mathematical tools, such as optimization theory, machine learning, stochastic geometry, transport theory, and game theory are described. The use of such tools for addressing unique UAV problems is also presented. In a nutshell, this tutorial provides key guidelines on how to analyze, optimize, and design UAV-based wireless communication systems.

1,395 citations

Journal ArticleDOI
TL;DR: The design goals and the techniques, which different LPWA technologies exploit to offer wide-area coverage to low-power devices at the expense of low data rates are presented.
Abstract: Low power wide area (LPWA) networks are attracting a lot of attention primarily because of their ability to offer affordable connectivity to the low-power devices distributed over very large geographical areas. In realizing the vision of the Internet of Things, LPWA technologies complement and sometimes supersede the conventional cellular and short range wireless technologies in performance for various emerging smart city and machine-to-machine applications. This review paper presents the design goals and the techniques, which different LPWA technologies exploit to offer wide-area coverage to low-power devices at the expense of low data rates. We survey several emerging LPWA technologies and the standardization activities carried out by different standards development organizations (e.g., IEEE, IETF, 3GPP, ETSI) as well as the industrial consortia built around individual LPWA technologies (e.g., LoRa Alliance, Weightless-SIG, and Dash7 alliance). We further note that LPWA technologies adopt similar approaches, thus sharing similar limitations and challenges. This paper expands on these research challenges and identifies potential directions to address them. While the proprietary LPWA technologies are already hitting the market with large nationwide roll-outs, this paper encourages an active engagement of the research community in solving problems that will shape the connectivity of tens of billions of devices in the next decade.

1,362 citations

Journal ArticleDOI
TL;DR: Among the possible subcarrier mapping approaches, it is found that localizedFDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (JFDMA), however, the PARR performance of IFDMA is better than that of LFDMA.
Abstract: Single carrier frequency division multiple access (SC FDMA), a modified form of orthogonal FDMA (OFDMA), is a promising technique for high data rate uplink communications in future cellular systems. SC-FDMA has similar throughput performance and essentially the same overall complexity as OFDMA. A principal advantage of SC-FDMA is the peak-to-average power ratio (PARR), which is lower than that of OFDMA. SC FDMA is currently a strong candidate for the uplink multiple access scheme in the long term evolution of cellular systems under consideration by the third generation partnership project (3GPP). In this paper, we give an overview of SC-FDMA. We also analyze the effects of subcarrier mapping on throughput and PARR. Among the possible subcarrier mapping approaches, we find that localized FDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (JFDMA). However, the PARR performance of IFDMA is better than that of LFDMA. As in other communications systems there are complex tradeoffs between design parameters and performance in an SC-FDMA system

1,328 citations

Journal ArticleDOI
TL;DR: The present paper analyzes in detail the potential of 5G technologies for the IoT, by considering both the technological and standardization aspects and illustrates the massive business shifts that a tight link between IoT and 5G may cause in the operator and vendors ecosystem.
Abstract: The IoT paradigm holds the promise to revolutionize the way we live and work by means of a wealth of new services, based on seamless interactions between a large amount of heterogeneous devices. After decades of conceptual inception of the IoT, in recent years a large variety of communication technologies has gradually emerged, reflecting a large diversity of application domains and of communication requirements. Such heterogeneity and fragmentation of the connectivity landscape is currently hampering the full realization of the IoT vision, by posing several complex integration challenges. In this context, the advent of 5G cellular systems, with the availability of a connectivity technology, which is at once truly ubiquitous, reliable, scalable, and cost-efficient, is considered as a potentially key driver for the yet-to emerge global IoT. In the present paper, we analyze in detail the potential of 5G technologies for the IoT, by considering both the technological and standardization aspects. We review the present-day IoT connectivity landscape, as well as the main 5G enablers for the IoT. Last but not least, we illustrate the massive business shifts that a tight link between IoT and 5G may cause in the operator and vendors ecosystem.

1,224 citations