LTE (telecommunication)

Summary

In telecommunications, long-term evolution (LTE) is a standard for wireless broadband communication for mobile devices and data terminals, based on the GSM/EDGE and UMTS/HSPA standards. It improves on those standards' capacity and speed by using a different radio interface and core network improvements. LTE is the upgrade path for carriers with both GSM/UMTS networks and CDMA2000 networks. Because LTE frequencies and bands differ from country to country, only multi-band phones can use LTE in all countries where it is supported. Terminology The standard is developed by the 3GPP (3rd Generation Partnership Project) and is specified in its Release 8 document series, with minor enhancements described in Release 9. LTE is also called 3.95G and has been marketed as 4G LTE and Advanced 4G; but the original version did not meet the technical criteria of a 4G wireless service, as specified in the 3GPP Release 8 and 9 document series for LTE Advanced. The requirements were set forth

Official source

https://en.wikipedia.org/wiki/LTE_(telecommunication)

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iTETRIS: Adaptation of ITS Technologies for Large Scale Integrated Simulation

Kumar Vineet

The European Union (EU) Framework Program 7 (FP7) funded project, iTETRIS [1] (An Integrated Wireless and Traffic Platform for Real-Time Road Traffic Management Solutions) targets to extend state of art in simulation of wireless vehicular cooperative systems for evaluation of road traffic management services and applications. In particular, iTETRIS addresses four important and distinct challenges: (a) road traffic and wireless integrated open-source simulation platform, (b) large scale trials, (c) realistic Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communication simulation and (d) dynamic, distributed and self-autonomous Intelligent Transport Systems (ITS) [2] applications based on cooperative systems. iTETRIS will provide a standard compliant, open-source integrated communication and traffic platform suited for large scale scenario simulation. This Paper addresses extension of traffic simulator being used in iTETRIS, scalability studies of networking simulator, which have been achieved as project results. Further the paper presents the adaptation of the Intelligent Communications for Transport Systems (ICTS) [2] reference architecture functionalities being developed by the European Telecommunication Standard Institute (ETSI) at its Technical Committee (TC) on ITS.

2010

Bringing physical layer cooperation closer to practical wireless systems

Emre Atsan

Nowadays the demand for communication over the wireless medium is significantly increasing, while the available wireless spectrum is already limited. In this thesis, we introduce new practical physical layer designs that employ node cooperation for more efficient wireless spectrum utilization. First, a cooperative scheme is introduced that takes advantage of the existence of simultaneous multiple frequency band operation in modern wireless devices. The main idea of this scheme is to use one frequency band for sharing data among collaborating nodes, and another one for cooperatively transmitting to a common destination. The benefits of such a cooperative design across frequency bands are evaluated on a testbed of software-defined radios, where we investigate and identify the possible network conditions under which our scheme enables better throughput compared to the traditional operation. Second, we present a practical design that facilitates physical layer cooperation in Long Term Evolution (LTE) networks. The main idea here is to adapt the inherent Hybrid Automatic Repeat-reQuest (H-ARQ) in standard LTE operation, so that multiple relays can cooperate over the transmission of one encoded block. Performance evaluation of the design reveals significant throughout gains under asymmetric channel conditions for parallel relay networks in LTE framework. Finally, we look at the node cooperation from a privacy perspective in wireless sensor networks. To this end, we design and evaluate a low-overhead message encryption protocol based on network coding. The main idea of the protocol is to employ node cooperation to increase the inherent weak security that network coding offers. Results show up to 60% increase in terms of extra security added on top of the inherent one.

EPFL2015

IDIAP1999