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Institution

TeliaSonera

CompanyStockholm, Sweden
About: TeliaSonera is a company organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Mobile station & Terminal (electronics). The organization has 425 authors who have published 391 publications receiving 5974 citations.


Papers
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Journal ArticleDOI
TL;DR: This article addresses the issue of cross-layer networking, where the physical and MAC layer knowledge of the wireless medium is shared with higher layers, in order to provide efficient methods of allocating network resources and applications over the Internet.
Abstract: As the cellular and PCS world collides with wireless LANs and Internet-based packet data, new networking approaches will support the integration of voice and data on the composite infrastructure of cellular base stations and Ethernet-based wireless access points. This article highlights some of the past accomplishments and promising research avenues for an important topic in the creation of future wireless networks. We address the issue of cross-layer networking, where the physical and MAC layer knowledge of the wireless medium is shared with higher layers, in order to provide efficient methods of allocating network resources and applications over the Internet. In essence, future networks will need to provide "impedance matching" of the instantaneous radio channel conditions and capacity needs with the traffic and congestion conditions found over the packet-based world of the Internet. Furthermore, such matching will need to be coordinated with a wide range of particular applications and user expectations, making the topic of cross-layer networking increasingly important for the evolving wireless buildout.

917 citations

Rami Lehtonen1, Toni Paila2, Vincent Roca, Michael Luby3, Rod Walsh2 
06 Nov 2012
TL;DR: FLUTE, a protocol for the unidirectional delivery of files over the Internet, which is particularly suited to multicast networks, is defined.
Abstract: This document defines FLUTE, a protocol for the unidirectional delivery of files over the Internet, which is particularly suited to multicast networks. The specification builds on Asynchronous Layered Coding, the base protocol designed for massively scalable multicast distribution. This memo defines an Experimental Protocol for the Internet community.

340 citations

Journal Article
Anne Kaikkonen1, Aki Kekäläinen2, Mihael Cankar2, Titti Kallio2, Anu Kankainen 
TL;DR: Results indicate that conducting a time-consuming field test may not be worthwhile when searching user interface flaws to improve user interaction, and it is possible that field testing is worthwhile when combining usability tests with a field pilot or contextual study where user behavior is investigated in a natural context.
Abstract: Usability testing a mobile application in the laboratory seems to be sufficient when studying user interface and navigation issues. The usability of a consumer application was tested in two environments: in a laboratory and in a field with a total of 40 test users. The same problems were found in both environments, differences occurred in the frequency of findings between the contexts. Results indicate that conducting a time-consuming field test may not be worthwhile when searching user interface flaws to improve user interaction. In spite of this, it is possible that field testing is worthwhile when combining usability tests with a field pilot or contextual study where user behavior is investigated in a natural context.

336 citations

Journal ArticleDOI
TL;DR: A previously proposed Kronecker-structure-based narrow-band model for nonline-of-sight (NLoS) indoor multiple-input-multiple-output (MIMO) radio channels based on 5.2-GHz indoor MIMO channel measurements is verified and it is shown that the MIMo channel covariance matrix can be well approximated by the Kr onecker product of the covariance matrices.
Abstract: In this paper, we first verify a previously proposed Kronecker-structure-based narrow-band model for nonline-of-sight (NLoS) indoor multiple-input-multiple-output (MIMO) radio channels based on 5.2-GHz indoor MIMO channel measurements. It is observed that, for the narrow-band case, the measured channel coefficients are complex Gaussian distributed and, consequently, we focus on a statistical description using the first- and second-order moments of MIMO radio channels. It is shown that the MIMO channel covariance matrix can be well approximated by the Kronecker product of the covariance matrices, seen from the transmitter and receiver, respectively. A narrow-band model for NLoS indoor MIMO channels is thus verified by these results. As for the wide-band case, it is observed that the average power-delay profile of each element of the channel impulse response matrix fits the exponential decay curve and that the Kronecker structure of the second-order moments can be extended to each channel tap. A wide-band MIMO channel model is then proposed, combining a simple COST 259 single-input-single-output channel model and the Kronecker structure. Monte Carlo simulations are used to generate indoor MIMO channel realizations according to the models discussed. The results are compared with the measured data using the channel capacity and good agreement is found.

266 citations

Patent
Rantanen Kari1
20 Feb 1997
TL;DR: In this article, the authors propose a system and method to transmit data to a company's data system by a mobile phone connected to a mobile communications network, and receive an acknowledgment to the same mobile phone from the data system.
Abstract: Disclosed is a system and method to transmit data to a company's data system by a mobile phone connected to a mobile communications network, and receive an acknowledgment to the same mobile phone from the company's data system. A preset target number dialed by a mobile phone is directed to an intelligent network center. The target number is decoded into data which is transmitted to a company's data system during the connection. The intelligent network center uses the caller's identifying number to check whether the caller is entitled to use the service, and to check to which information system of which company the data has been sent. The intelligent network center transmits a telecommunications network signaling the target number, caller's number and address of the company's to a voice server computer capable of identifying telephone numbers and formulate voice messages. The voice server converts the target number into data and transmits the data and the caller's number to the company's data system using a data network protocol. The company's data system stores the data in the data system and formulates a return message, which includes an acknowledgment of the received data and further a possible additional information, and transmits it to the voice server using the data network. The voice server transmits using the mobile communications network the return message either as a GSM short message or as a voice message to the mobile station which transmitted the data code, or as a pager message to a desired pager device.

127 citations


Authors

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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20181
20173
20162
20157
20146
201312