| 1. |
- Fallgren, Mikael, et al.
(författare)
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Introduction
- 2021
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Ingår i: Cellular V2X for Connected Automated Driving. - : Wiley. ; , s. 1-20
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter presents a brief background and motivation for cellular vehicle-to-everything (C-V2X), connected automated driving (CAD), and connected road user (CRU) services, including key technical terminology. Although sensor technologies have been and are used for ITS services, performance is severely degraded in non-line-of-sight (NLOS) situations and certain weather conditions. Hence, radio technologies are considered a crucial enabler for ITS, with a special focus on CAD. The chapter describes the ambitions of the telecommunication and automotive industries for a joint roadmap for CAD. It then goes into more detail about communication technologies for CAD and the standardization organizations. The chapter also provides an overview of the key concepts discussed in this book. The book describes the ecosystem around CAD, including business aspects and standardization as well as technical solutions enabling successful delivery of such systems from a communication perspective.
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| 2. |
- Laya, Andres, et al.
(författare)
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Goodbye, ALOHA!
- 2016
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Ingår i: IEEE Access. - : IEEE. - 2169-3536. ; 4, s. 2029-2044
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Tidskriftsartikel (refereegranskat)abstract
- The vision of the Internet of Things (IoT) to interconnect and Internet-connect everyday people, objects, and machines poses new challenges in the design of wireless communication networks. The design of medium access control (MAC) protocols has been traditionally an intense area of research due to their high impact on the overall performance of wireless communications. The majority of research activities in this field deal with different variations of protocols somehow based on ALOHA, either with or without listen before talk, i.e., carrier sensing multiple access. These protocols operate well under low traffic loads and low number of simultaneous devices. However, they suffer from congestion as the traffic load and the number of devices increase. For this reason, unless revisited, the MAC layer can become a bottleneck for the success of the IoT. In this paper, we provide an overview of the existing MAC solutions for the IoT, describing current limitations and envisioned challenges for the near future. Motivated by those, we identify a family of simple algorithms based on distributed queueing (DQ), which can operate for an infinite number of devices generating any traffic load and pattern. A description of the DQ mechanism is provided and most relevant existing studies of DQ applied in different scenarios are described in this paper. In addition, we provide a novel performance evaluation of DQ when applied for the IoT. Finally, a description of the very first demo of DQ for its use in the IoT is also included in this paper.
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| 3. |
- Li, Zexian, et al.
(författare)
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5GCAR project D3.1 Intermediate 5G V2X Radio
- 2018
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The 5GCAR project aims to contribute to 5G network design, and specifically to design V2X technology components for V2X use case classes identified in the project. The requirements on reliability, latency, data rates, spectral and energy efficiency cannot be fully supported by today’s wireless networks and V2X solutions and call for novel and innovative approaches, including the design of a new radio interface.
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