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Dive into the research topics where Helka-Liina Määttanen is active.

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Featured researches published by Helka-Liina Määttanen.


ieee conference on standards for communications and networking | 2017

LTE-WLAN aggregation (LWA) in 3GPP Release 13 & Release 14

Helka-Liina Määttanen; Gino Luca Masini; Mattias Bergström; Antti Ratilainen; Torsten Dudda

Integrating different radio access technologies (RATs) is one effective method to meet the demand to provide ever increasing data rates to the users. For integrating LTE and WLAN in particular, the purpose is to enhance the operators control of when the UE uses WLAN. Another aim, in addition to better network control on which RAT is used, is the possible data aggregation which enables simultaneous utilization of both resources. In this paper, we present LTE-WLAN Aggregation (LWA) as specified in 3GPP and compare it to the LTE-WLAN Radio Level Integration with IPsec tunnel (LWIP), also specified in 3GPP. In addition, we provide simulation results comparing the schemes in an example scenario.


IEEE Communications Magazine | 2018

The Sky Is Not the Limit: LTE for Unmanned Aerial Vehicles

Xingqin Lin; Vijaya Yajnanarayana; Siva D. Muruganathan; Shiwei Gao; Henrik Asplund; Helka-Liina Määttanen; Mattias Bergström; Sebastian Euler; Y.-P. Eric Wang


Archive | 2017

Short PUCCH in Uplink sPUCCH

Helka-Liina Määttanen; Mattias Andersson; Stefan Parkvall; Per Synnergren; Stefan Wager; Hanzhi Zhang


Archive | 2016

Defining sub-subchannels for data communication using separately provided frequency and time resources and related wireless terminals and network nodes

David Astely; Stefan Parkvall; Helka-Liina Määttanen; Niklas Andgart; Mattias Andersson


Archive | 2015

Reducing reference signals when communicating multiple sub-subframes between a base station and a wireless terminal

Mattias Andersson; Niklas Andgart; Helka-Liina Määttanen


arXiv: Networking and Internet Architecture | 2018

Mobile Networks Connected Drones: Field Trials, Simulations, and Design Insights.

Xingqin Lin; Richard Wiren; Sebastian Euler; Arvi Sadam; Helka-Liina Määttanen; Siva D. Muruganathan; Shiwei Gao; Y.-P. Eric Wang; Juhani Kauppi; Zhenhua Zou; Vijaya Yajnanarayana


arXiv: Networking and Internet Architecture | 2018

Mobility Support for Cellular Connected Unmanned Aerial Vehicles: Performance and Analysis.

Sebastian Euler; Helka-Liina Määttanen; Xingqin Lin; Zhenhua Zou; Mattias Bergström; Jonas Sedin


Archive | 2016

Method for controlling transmission of data

Reem Karaki; Torsten Dudda; Hanzhi Zhang; Torbjörn Wigren; Helka-Liina Määttanen; Stefan Stefan


arXiv: Networking and Internet Architecture | 2018

An Overview of 3GPP Release-15 Study on Enhanced LTE Support for Connected Drones.

Siva D. Muruganathan; Xingqin Lin; Helka-Liina Määttanen; Zhenhua Zou; Wuri A. Hapsari; Shinpei Yasukawa


Archive | 2017

Methods, Source Network Node and Target Network Node for Handover of a Wireless Communication Device

Gino Luca Masini; Markus Drevö; Torsten Dudda; Vesa Lehtovirta; Helka-Liina Määttanen; Alexander Vesely

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