| 1. |
- Fodor, Gábor, et al.
(författare)
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Device-to-device communications for national security and public safety
- 2014
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Ingår i: IEEE Access. - 2169-3536. ; 2, s. 1510-1520
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Tidskriftsartikel (refereegranskat)abstract
- Device-to-device (D2D) communications have been proposed as an underlay to long-term evolution (LTE) networks as a means of harvesting the proximity, reuse, and hop gains. However, D2D communications can also serve as a technology component for providing public protection and disaster relief (PPDR) and national security and public safety (NSPS) services. In the United States, for example, spectrum has been reserved in the 700-MHz band for an LTE-based public safety network. The key requirement for the evolving broadband PPDR and NSPS services capable systems is to provide access to cellular services when the infrastructure is available and to efficiently support local services even if a subset or all of the network nodes become dysfunctional due to public disaster or emergency situations. This paper reviews some of the key requirements, technology challenges, and solution approaches that must be in place in order to enable LTE networks and, in particular, D2D communications, to meet PPDR and NSPS-related requirements. In particular, we propose a clustering-procedure-based approach to the design of a system that integrates cellular and ad hoc operation modes depending on the availability of infrastructure nodes. System simulations demonstrate the viability of the proposed design. The proposed scheme is currently considered as a technology component of the evolving 5G concept developed by the European 5G research project METIS.
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| 2. |
- Astely, D, et al.
(författare)
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LTE release 12 and beyond
- 2013
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Ingår i: IEEE Communications Magazine. - : IEEE Press. - 0163-6804 .- 1558-1896. ; 51:7, s. 154-160
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Tidskriftsartikel (refereegranskat)abstract
- As the specification of Release 11 of the LTE standards is approaching its completion, 3GPP is gradually moving its focus toward the next major step in the evolution of LTE. The drivers of the LTE evolution include the increasing demand for mobile broadband services and traffic volumes as well as emerging usage scenarios involving short-range and machine-type communications. In this article we provide an overview of the key technology areas/components that are currently considered by 3GPP for Rel-12, including support for further enhanced local area access by tight interaction between the wide area and local area layers, signaling solutions for wireless local area network integration, multi-antenna enhancements, improved support for massive MTC, and direct device-to-device communications.
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| 3. |
- Dahlman, Erik, et al.
(författare)
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5G radio access
- 2014
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Ingår i: Ericsson Technology Review. - 0014-0171. ; 91:1, s. 42-47
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Mobile communication has evolved significantly from early voice systems to today's highly sophisticated integrated communication platforms that provide numerous services, and support countless applications used by billions of people around the world.
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| 4. |
- Fodor, G, et al.
(författare)
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Design Aspects of Network Assisted Device-to-Device Communications
- 2012
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Ingår i: IEEE Communications Magazine. - : IEEE Press. - 0163-6804 .- 1558-1896. ; 50:3, s. 170-177
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Tidskriftsartikel (refereegranskat)abstract
- Device-to-device (D2D) communications underlaying a cellular infrastructure has been proposed as a means of taking advantage of the physical proximity of communicating devices, increasing resource utilization, and improving cellular coverage. Relative to the traditional cellular methods, there is a need to design new peer discovery methods, physical layer procedures, and radio resource management algorithms that help realize the potential advantages of D2D communications. In this article we use the 3GPP Long Term Evolution system as a baseline for D2D design, review some of the key design challenges, and propose solution approaches that allow cellular devices and D2D pairs to share spectrum resources and thereby increase the spectrum and energy efficiency of traditional cellular networks. Simulation results illustrate the viability of the proposed design.
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| 5. |
- R, Baldemair, et al.
(författare)
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Future wireless communications
- 2013
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Ingår i: 2013 IEEE 77th Vehicular Technology Conference (VTC Spring). - New York : IEEE Press.
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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