News and events - Tampere University of Technology

New solution for reliable wireless device-to-device connections in LTE cellular networks

In his dissertation, MSc Alexander Pyattaev proposes a novel connection management protocol for portable devices that utilizes a LTE cellular network for signaling and peer discovery, while also enabling reliable D2D data transfer over a Wi-Fi connection.

Cellular networks have accompanied us for nearly half a century. Surprisingly, very little has been done to change the underlying concept – the cell phones connect to a base station, which, in turn, connects the phones everywhere else (including other phones) via the operator’s infrastructure. The shortcomings of this star-like topology become apparent when large throughputs or low latencies are required, like in cases of file exchange or multiplayer gaming. While the slowness of a cellular link may appear acceptable when communicating with servers miles away, it becomes very inappropriate when the destination is just meters away.

To resolve this issue, a direct, wireless device-to-device (D2D) connection can be set up to complement the cellular network whenever possible. Such D2D links could utilize Wi-Fi interfaces, which are currently available on nearly all handheld platforms. However, while technically feasible, D2D connectivity requires a lot of work behind the scene to become a user-friendly and secure alternative for cellular connections.

In his dissertation, MSc Alexander Pyattaev proposes a novel connection management protocol for portable devices that utilizes a LTE cellular network for signaling and peer discovery, while also enabling reliable D2D data transfer over a Wi-Fi connection. By means of analysis and extensive system-level simulations, the study illustrates that the new system can efficiently leverage the unlicensed spectrum connectivity to boost the average speed of connections between proximal cellular users by as much as doubling it compared to the baseline LTE access, even in dense environments. Unlike most academic work, the dissertation also presents results from prototyping, and live trial activities run on a real commercial-grade LTE network to illustrate the applicability of the new system.

Public defence of a doctoral dissertation on Friday, 29 January 2016

MSc Alexander Pyattaev’s doctoral dissertation in the field of wireless communication entitled ‘Technological and Architectural Enablers for Direct Device Connectivity in LTE Cellular Networks’ will be publicly examined at the Faculty of Electronics and Communications Engineering of Tampere University of Technology (TUT) in auditorium SM221 in the Sähkötalo building (address: Korkeakoulunkatu 1, Tampere, Finland) at 12 noon on Friday, 29 January 2016. 

The opponent will be Professor Halim Yanikomeroglu from Carleton University, Ontario, Canada. Professor Yevgeni Koucheryavy from the Department of Electronics and Communications Engineering of TUT will act as Chairman.

Further information: Alexander Pyattaev, tel. +358 452 761 993,

News submitted by: Tiina Leivo
Keywords: science and research, lte cellular networks, device-to-device connections, d2d data transfer