The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Erik Dahlman - One of the best experts on this subject based on the ideXlab platform.
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Chapter 3 – LTE Radio Access: An Overview
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:This chapter provides an overview of LTE and its evolution. The most important technology components of LTE release 8—including transmission schemes, scheduling, multi-antenna support, and Spectrum Flexibility—as well as the additional features and enhancements (e.g., carrier aggregation, relaying, license-assisted access, enhancements for machine-type communication, and direct device-to-device communication) introduced in later releases up to and including release 13 are presented. The chapter can either be read on its own to get a high-level overview of LTE, or as an introduction to the subsequent chapters.
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Chapter 5 – Physical Transmission Resources
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan ParkvallAbstract:The basic time–frequency structure of LTE transmission is the topic of this chapter. LTE supports both FDD and TDD using the same basic radio-interface structure, thereby adding to the overall Spectrum Flexibility without fragmenting the LTE technology. This chapter also discusses coexistence between LTE TDD and 3G TDD systems such as TD-SCDMA.
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Chapter 22 – Spectrum and RF Characteristics
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan ParkvallAbstract:Radio-frequency (RF) requirements in terms of allowed transmission power, transmitted signal quality within the carrier, unwanted emissions outside the carrier, receiver sensitivity, and interference sensitivity are important to enable coexistence between operators and radio-access technologies. Spectrum Flexibility is a key feature of LTE radio access and also has a profound impact on the RF requirements. This chapter provides a detail on how these parameters are defined and how multi-standard base stations can be described in terms of RF requirements. RF requirements for multiband base stations, LAA base stations, relays, and active antenna systems are also treated.
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Chapter 9 – Physical Transmission Resources
4G: LTE LTE-Advanced for Mobile Broadband, 2014Co-Authors: Erik DahlmanAbstract:The basic time-frequency structure of LTE transmission is the topic of this chapter. LTE supports both FDD and TDD using the same basic radio-interface structure, thereby adding to the overall Spectrum Flexibility without fragmenting the LTE technology. This chapter also discusses coexistence between LTE TDD and 3G TDD systems such as TD-SCDMA.
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Chapter 7 – LTE Radio Access: An Overview
4G: LTE LTE-Advanced for Mobile Broadband, 2014Co-Authors: Erik DahlmanAbstract:Referring back to the previous chapters, this chapter provides an overview of the most important technology aspects of LTE, including the transmission scheme, the scheduling functionality, the retransmission mechanisms, interference handling, and Spectrum Flexibility. It also covers the basic principles for the additional technology components introduced in LTE releases 10 and 11, including carrier aggregation, relaying functionality, and multi-point coordination and transmission.
Stefan Parkvall - One of the best experts on this subject based on the ideXlab platform.
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5G New Radio: Unveiling the Essentials of the Next Generation Wireless Access Technology
arXiv: Networking and Internet Architecture, 2018Co-Authors: Jingya Li, Stefan Parkvall, Daniel Larsson, Havish Koorapaty, Robert Baldemair, Thomas Cheng, Mattias Frenne, Sorour Falahati, Asbjörn GrövlenAbstract:The 5th generation (5G) wireless access technology, known as new radio (NR), will address a variety of usage scenarios from enhanced mobile broadband to ultra-reliable low-latency communications to massive machine type communications. Key technology features include ultra-lean transmission, support for low latency, advanced antenna technologies, and Spectrum Flexibility including operation in high frequency bands and inter-working between high and low frequency bands. This article provides an overview of the essentials of the state of the art in 5G wireless technology represented by the 3GPP NR technical specifications, with a focus on the physical layer. We describe the fundamental concepts of 5G NR, explain in detail the design of physical channels and reference signals, and share the various design rationales influencing standardization.
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Chapter 3 – LTE Radio Access: An Overview
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:This chapter provides an overview of LTE and its evolution. The most important technology components of LTE release 8—including transmission schemes, scheduling, multi-antenna support, and Spectrum Flexibility—as well as the additional features and enhancements (e.g., carrier aggregation, relaying, license-assisted access, enhancements for machine-type communication, and direct device-to-device communication) introduced in later releases up to and including release 13 are presented. The chapter can either be read on its own to get a high-level overview of LTE, or as an introduction to the subsequent chapters.
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Chapter 5 – Physical Transmission Resources
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan ParkvallAbstract:The basic time–frequency structure of LTE transmission is the topic of this chapter. LTE supports both FDD and TDD using the same basic radio-interface structure, thereby adding to the overall Spectrum Flexibility without fragmenting the LTE technology. This chapter also discusses coexistence between LTE TDD and 3G TDD systems such as TD-SCDMA.
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Chapter 22 – Spectrum and RF Characteristics
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan ParkvallAbstract:Radio-frequency (RF) requirements in terms of allowed transmission power, transmitted signal quality within the carrier, unwanted emissions outside the carrier, receiver sensitivity, and interference sensitivity are important to enable coexistence between operators and radio-access technologies. Spectrum Flexibility is a key feature of LTE radio access and also has a profound impact on the RF requirements. This chapter provides a detail on how these parameters are defined and how multi-standard base stations can be described in terms of RF requirements. RF requirements for multiband base stations, LAA base stations, relays, and active antenna systems are also treated.
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Chapter 7 – LTE Radio Access: An Overview
4G LTE/LTE-Advanced for Mobile Broadband, 2011Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:Publisher Summary This chapter provides an overview of long-term evolution (LTE) up to and including release 10. At the core of the LTE transmission scheme is the use of shared-channel transmission with the overall time–frequency resource dynamically shared between users. A high degree of Spectrum Flexibility is one of the main characteristics of the LTE radio-access technology. The aim of this Spectrum Flexibility is to allow for the deployment of LTE radio access in different frequency bands with different characteristics. In practice the LTE radio-access technology supports a limited set of transmission bandwidths, but additional transmission bandwidths can easily be introduced by updating only the RF specifications. One of the main targets of LTE release 10 was to ensure that the LTE radio-access technology would be fully compliant with the IMT-Advanced requirements, thus the name LTE-Advanced is often used for LTE release 10. This chapter discusses the most important technologies used by LTE release 8—including transmission schemes, scheduling, multiantenna support, and Spectrum Flexibility. Additional features introduced in LTE releases 9 and 10 are also discussed.
Johan Sköld - One of the best experts on this subject based on the ideXlab platform.
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Chapter 3 – LTE Radio Access: An Overview
4g LTE Evolution and the Road to 5G, 2016Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:This chapter provides an overview of LTE and its evolution. The most important technology components of LTE release 8—including transmission schemes, scheduling, multi-antenna support, and Spectrum Flexibility—as well as the additional features and enhancements (e.g., carrier aggregation, relaying, license-assisted access, enhancements for machine-type communication, and direct device-to-device communication) introduced in later releases up to and including release 13 are presented. The chapter can either be read on its own to get a high-level overview of LTE, or as an introduction to the subsequent chapters.
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Chapter 7 – LTE Radio Access: An Overview
4G LTE/LTE-Advanced for Mobile Broadband, 2011Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:Publisher Summary This chapter provides an overview of long-term evolution (LTE) up to and including release 10. At the core of the LTE transmission scheme is the use of shared-channel transmission with the overall time–frequency resource dynamically shared between users. A high degree of Spectrum Flexibility is one of the main characteristics of the LTE radio-access technology. The aim of this Spectrum Flexibility is to allow for the deployment of LTE radio access in different frequency bands with different characteristics. In practice the LTE radio-access technology supports a limited set of transmission bandwidths, but additional transmission bandwidths can easily be introduced by updating only the RF specifications. One of the main targets of LTE release 10 was to ensure that the LTE radio-access technology would be fully compliant with the IMT-Advanced requirements, thus the name LTE-Advanced is often used for LTE release 10. This chapter discusses the most important technologies used by LTE release 8—including transmission schemes, scheduling, multiantenna support, and Spectrum Flexibility. Additional features introduced in LTE releases 9 and 10 are also discussed.
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Physical Transmission Resources
4G LTE/LTE-Advanced for Mobile Broadband, 2011Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:The basic time-frequency structure of LTE transmission is the topic of this chapter. LTE supports both FDD and TDD using the same basic radio-interface structure, thereby adding to the overall Spectrum Flexibility without fragmenting the LTE technology. This chapter also discusses coexistence between LTE TDD and 3G TDD systems such as TD-SCDMA.
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Chapter 17 – Spectrum and RF Characteristics
4G LTE/LTE-Advanced for Mobile Broadband, 2011Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:Publisher Summary This chapter presents an overview of the characteristics of Spectrum and RF. Spectrum Flexibility is a key feature of LTE radio access and is set out in the LTE design targets. It consists of several components, including deployment in different sized Spectrum allocations and deployment in diverse frequency ranges, both in paired and unpaired frequency bands. There are a number of frequency bands identified for mobile use and specifically for IMT today. Both paired and unpaired bands are included in the LTE specifications. One of the main challenges with LTE operation in some bands is the possibility of using channel bandwidths up to 20 MHz with a single carrier and even beyond that with aggregated carriers. The use of OFDM in LTE gives Flexibility both in terms of the size of the Spectrum allocation needed and in the instantaneous transmission bandwidth used. The OFDM physical layer also enables frequency-domain scheduling. This chapter begins with a discussion on Spectrum for LTE. The chapter discusses frequency bands for LTE, flexible Spectrum USE, and flexible channel bandwidth operation. An overview of the RF requirements for LTE is presented. The chapter concludes with a discussion on sensitivity and dynamic range, and receiver susceptibility to interfering signals.
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LTE Radio Access: An Overview
3G Evolution, 2007Co-Authors: Erik Dahlman, Stefan Parkvall, Johan SköldAbstract:This chapter provides an overview of some of the most important components and features of Long-Term Evolution (LTE). These include transmission schemes, scheduling, hybrid ARQ with soft combining, multi-antenna support, and Spectrum Flexibility. The LTE downlink transmission scheme is based on orthogonal frequency division multiplex (OFDM). Due to the relatively long OFDM symbol time in combination with a cyclic prefix, OFDM provides a high degree of robustness against channel frequency selectivity. Moreover, OFDM with its inherent robustness to frequency-selective fading is attractive for the downlink, especially when combined with spatial multiplexing. At the heart of the LTE transmission scheme is the use of shared-channel transmission. In this transmission, the time-frequency resource is dynamically shared between users. The use of shared-channel transmission is well matched to the rapidly varying resource requirements posed by packet data and also enables several of the other key technologies used by LTE. Finally, one important part of the LTE requirements in terms of Spectrum Flexibility is the possibility to deploy LTE-based radio access in both paired and unpaired Spectrum that is LTE should support both frequency- and time-division-based duplex arrangements.
Kambiz Zangi - One of the best experts on this subject based on the ideXlab platform.
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VTC Fall - LTE-Advanced - Evolving LTE towards IMT-Advanced
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Stefan Parkvall, Stefan WÄnstedt, Magnus Olsson, Anders Furuskar, Erik Dahlman, Ylva Jading, Kambiz ZangiAbstract:This paper provides a high-level overview of some technology components currently considered for the evolution of LTE including complete fulfillment of the IMT-advanced requirements. These technology components include extended Spectrum Flexibility, multi-antenna solutions, coordinated multipoint transmission/reception, and the use of advanced repeaters/relaying. A simple performance assessment is also included, indicating potential for significantly increased performance.
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LTE-Advanced - Evolving LTE towards IMT-Advanced
IEEE Vehicular Technology Conference, 2008Co-Authors: Stefan Parkvall, Stefan WÄnstedt, Magnus Olsson, Anders Furuskar, Erik Dahlman, Ylva Jading, Kambiz ZangiAbstract:This paper provides a high-level overview of some technology components currently considered for the evolution of LTE including complete fulfillment of the IMT-advanced requirements. These technology components include extended Spectrum Flexibility, multi-antenna solutions, coordinated multipoint transmission/reception, and the use of advanced repeaters/relaying. A simple performance assessment is also included, indicating potential for significantly increased performance.
Anders Furuskar - One of the best experts on this subject based on the ideXlab platform.
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LTE: the evolution of mobile broadband
IEEE Communications Magazine, 2009Co-Authors: David Astely, Anders Furuskar, Erik Dahlman, Ylva Jading, Magnus Lindström, Stefan ParkvallAbstract:This article provides an overview of the LTE radio interface, recently approved by the 3GPP, together with a more in-depth description of its features such as Spectrum Flexibility, multi-antenna transmission, and inter-cell interference control. The performance of LTE and some of its key features is illustrated with simulation results. The article is concluded with an outlook into the future evolution of LTE.
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VTC Fall - LTE-Advanced - Evolving LTE towards IMT-Advanced
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Stefan Parkvall, Stefan WÄnstedt, Magnus Olsson, Anders Furuskar, Erik Dahlman, Ylva Jading, Kambiz ZangiAbstract:This paper provides a high-level overview of some technology components currently considered for the evolution of LTE including complete fulfillment of the IMT-advanced requirements. These technology components include extended Spectrum Flexibility, multi-antenna solutions, coordinated multipoint transmission/reception, and the use of advanced repeaters/relaying. A simple performance assessment is also included, indicating potential for significantly increased performance.
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LTE-Advanced - Evolving LTE towards IMT-Advanced
IEEE Vehicular Technology Conference, 2008Co-Authors: Stefan Parkvall, Stefan WÄnstedt, Magnus Olsson, Anders Furuskar, Erik Dahlman, Ylva Jading, Kambiz ZangiAbstract:This paper provides a high-level overview of some technology components currently considered for the evolution of LTE including complete fulfillment of the IMT-advanced requirements. These technology components include extended Spectrum Flexibility, multi-antenna solutions, coordinated multipoint transmission/reception, and the use of advanced repeaters/relaying. A simple performance assessment is also included, indicating potential for significantly increased performance.
