516 research outputs found
An efficient data transmission policy in an integrated voice-data ds-cdma network
CDMA schemes appear to be promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an adaptive S-ALOHA DS-CDMA access scheme as a method for integrating non-real time (i.e. Internet applications) and real-time (i.e. voice) services, by exploiting the potentials of CDMA under time-varying conditions. The adaptive component terminals autonomously change their transmission rate according to the total (voice+data) channel occupancy, so that the minimum possible data delay is almost always achieved.Peer ReviewedPostprint (published version
DECT-2020 New Radio: The Next Step Towards 5G Massive Machine-Type Communications
Massive machine type communications (mMTC) is one of the cornerstone services
that have to be supported by 5G systems. 3GPP has already introduced LTE-M and
NB-IoT, often referred to as cellular IoT, in 3GPP Releases 13, 14, and 15 and
submitted these technologies as part of 3GPP IMT-2020 (i.e., 5G) technology
submission to ITU-R. Even though NB-IoT and LTE-M have shown to satisfy 5G mMTC
requirements defined by ITU-R, it is expected that these cellular IoT solutions
will not address all aspects of IoT and ongoing digitalization, including the
support for direct communication between "things" with flexible deployments,
different business models, as well as support for even higher node densities
and enhanced coverage. In this paper, we introduce the DECT-2020 standard
recently published by ETSI for mMTC communications. We evaluate its performance
and compare it to the existing LPWAN solutions showing that it outperforms
those in terms of supported density of nodes while still keeping delay and loss
guarantees at the required level.Comment: Author-Submitted Paper to IEEE Communications Magazine, 7 pages, 4
figures, 2 table
Evaluación del rendimiento de la arquitectura de seguridad INDECT
This paper evaluates the performance of the key elements of the security architecture developed by the INDECT project. In particular it first evaluates three different concurrent error detection mechanism (parity check, Berger code, and cyclic redundancy check) developed in software- and hardware-based implementations of the INDECT block cipher. It also analyses the performance hit in secure web servers when enabling TLS/SSL with mutual authentication. Finally, it evaluates the throughput and delay of traffic in the virtual private network based on the OpenVPN software package with the implemented INDECT block cipher. The results of these evaluations demonstrate that the proposed mechanisms, and by extension the whole INDECT security architecture, are viable and can be used in high-performance Police information and communication systems.Este artículo evalúa el rendimiento de los principales elementos de la arquitectura de seguridad desarrollada por el proyecto INDECT. En particular, en primer lugar evalúa tres mecanismos diferentes de detección concurrente de errores (comprobación de paridad, códigos Berger y verificación por redundancia cíclica) desarrollados en las implementaciones software y hardware del algoritmo de cifrado de bloque INDECT. También se analiza el impacto en el rendimiento de los servidores web seguros cuando se activa TLS/SSL con autenticación mutua. Por último, evalúa el rendimiento y el retardo del tráfico en una red privada virtual, basada en el software OpenVPN con el algoritmo de cifrado INDECT. Los resultados de estas evaluaciones demuestran que los mecanismos propuestos, y el algoritmo de cifrado INDECT, son viables y pueden usarse en sistemas de información y comunicaciones de alto rendimiento para la Policía
Quality of Service Controlled Multimedia Transport Protocol
PhDThis research looks at the design of an open transport protocol that supports a range of
services including multimedia over low data-rate networks. Low data-rate multimedia
applications require a system that provides quality of service (QoS) assurance and flexibility.
One promising field is the area of content-based coding. Content-based systems use an array
of protocols to select the optimum set of coding algorithms. A content-based transport
protocol integrates a content-based application to a transmission network.
General transport protocols form a bottleneck in low data-rate multimedia
communicationbsy limiting throughpuot r by not maintainingt iming requirementsT. his work
presents an original model of a transport protocol that eliminates the bottleneck by
introducing a flexible yet efficient algorithm that uses an open approach to flexibility and
holistic architectureto promoteQ oS.T he flexibility andt ransparenccyo mesi n the form of a
fixed syntaxt hat providesa seto f transportp rotocols emanticsT. he mediaQ oSi s maintained
by defining a generic descriptor. Overall, the structure of the protocol is based on a single
adaptablea lgorithm that supportsa pplication independencen, etwork independencea nd
quality of service.
The transportp rotocol was evaluatedth rougha set of assessmentos:f f-line; off-line
for a specific application; and on-line for a specific application. Application contexts used
MPEG-4 test material where the on-line assessmenuts eda modified MPEG-4 pl; yer. The
performanceo f the QoSc ontrolledt ransportp rotocoli s often bettert hano thers chemews hen
appropriateQ oS controlledm anagemenatl gorithmsa re selectedT. his is shownf irst for an
off-line assessmenwt here the performancei s compared between the QoS controlled
multiplexer,a n emulatedM PEG-4F lexMux multiplexers chemea, ndt he targetr equirements.
The performanceis also shownt o be better in a real environmentw hen the QoS controlled
multiplexeri s comparedw ith the real MPEG-4F lexMux scheme
Self-optimizing Uplink Outer Loop Power Control for WCDMA Network
The increasing demands for high data rates, drives the efforts for more efficient usage of the finite natural radio spectrum resources. Existing wideband code division multiple access (WCDMA) uplink outer loop power control has difficulty to answer to the new load on air interface. The main reason is that the maximum allowed noise rise per single user is fixed value. In worst case uplink load can be so high that all services, including conversational service, could be blocked. In this paper investigation has been performed to present correlation of main system parameters, used by uplink outer loop power control, to uplink load. Simulation has been created and executed to present difference in current implementation of uplink outer loop power control against proposed changes. Proposed solution is self-optimizing uplink outer loop power control in a way that maximum allowed noise rise per single user would be dynamically changed based on current uplink load on cell
Regulatory and Policy Implications of Emerging Technologies to Spectrum Management
This paper provides an overview of the policy implications of technological developments, and how these technologies can accommodate an increased level of market competition. It is based on the work carried out in the SPORT VIEWS (Spectrum Policies and Radio Technologies Viable In Emerging Wireless Societies) research project for the European Commission (FP6)spectrum, new radio technologies, UWB, SDR, cognitive radio, Telecommunications, regulation, Networks, Interconnection
Possible Application of Short Range Communication Technologies in the Digital Tachograph System to Support Vehicles Filtering during Road Controls
The existing Digital Tachograph is a regulatory instrument (mandatory by Council Regulation since 1st May 2006) to enforce the application of social regulations in road transport especially with the view to increase traffic safety. It records the work and the rest times of drivers as well as the vehicle speed over time with the aim to ensure that appropriate rest periods are taken by drivers and that a maximum of permissible speed is not exceeded.
The original and prime functionality of the Digital Tachograph is to document, i.e. to record, the driving history of a driver and his vehicle. Nevertheless controls by the road safety authorities are rather inefficient while time-consuming. The proposed update to the existing regulation would rather guarantee the Digital Tachograph as a compliance device rather than as an accurate recorder of driving history. Basic innovation is the application of short range communication technologies (like RFID) allowing the road authorities to scan by-passing vehicles and thus increasing the throughput by the order of ten.JRC.DG.G.7-Traceability and vulnerability assessmen
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