Green T

Project Overview

Green T  logo

One of the biggest impediments of future wireless communications systems is the need to limit the energy consumption of the battery-driven devices so as to prolong the operational times and to avoid active cooling. In fact, without new approaches for energy saving, there is a significant threat that the 4G mobile users will be searching for power outlets rather than network access, and becoming once again bound to a single location. GREEN-T aims to overcome the energy trap of 4Gmobile systems by investigating and demonstrating energy saving technologies for multi-standard wireless mobile devices, exploiting the combination of cognitive radio and cooperative strategies while still enabling the required performance in terms of data rate and QoS to support active applications. This notion is further extended by investigating lightweight security approaches, which is a pivotal requirements of 4G systems that will constitute a multitude of players from network operators to services provides cooperating under a converged service platform.

Project Implementation

GREEN-T commits to the creation of tangible outputs, this includes not only implementations and showcases, but also inputs to standardisation, and where regulation is affected to regulation (via input to, for example, future editions of the ERO (European Radiocommunications Office) workshops on SDR/CR) and finally through creation of commercially exploitable intellectual property. By definition GREEN-T is a research not a development project, however with having a rather large number of SMEs and industry, with a clear scope for commercial exploitation of the project outcomes. Envisaged products include:

a) LTE emulator platform; to serve as an experimental platform for operators to investigate new deployment scenarios for LTE energy saving

b) Energy-efficient demonstrators for cooperation with short-range and vertical handovers; The GREEN-T is in line with the European strategy on Green communications, and can provide the knowledge that will be the base of new products and even new industries. Particularly, the energy efficiency solutions will have a very direct impact on the network operator OPEX, and hence significantly change the operator’s competitiveness.

c) Products for public safety scenarios, specifically for the PMR devices of TETRA and TETRAPOL networks.

d) Incentives to encourage cooperation among users/handsets and develop attractive business models for the network/service providers to stimulate and motivate cooperative networking among users and between heterogeneous networks.

Key Objectives

As the prime authors and co-ordinator of the “Energy efficient network discovery mechanisms” deliverable, WIT investigated and analysed various energy efficient network discovery, identification and selection mechanisms. It also provided:

  • a state-of-the-art review for current network discovery techniques
  • an analysis of several standardisation bodies has been carried out i.e. 3GPP, IETF and ETSI
  • an analysis of network access and discovery enablers – i.e. parameters that need to be identified and the geo-location information that can be used to determine the most energy efficient access technologies
  • energy efficient network discovery mechanisms and outlined ways to optimally select the most energy efficient interface

TSSG provided a comprehensive state-of-the-art analysis of vertical handover techniques and technologies for the “Green vertical handover algorithms” deliverable. At the same time, WIT-TSSG provided extensive details of the vertical handover algorithm that was used to develop the energy efficient network selection application.

Project Achievements

WIT-TSSG developed an Android application to monitor the various interfaces on a tablet pc – 2G, 3G and Wifi.

For this application, there are 3 scenarios:

  1. In the first scenario, the user device is connected through the Wifi interface.  In this case, the phone uses the Wifi connection for data communications.  The 2G interface also needs to be on for the phone to be able to make and receive phone calls. In this case we can turn off the 3G interface.
  2. In the second scenario, the user device is connected through the 3G interface for both voice and data.  In this case we can turn off the 2G and Wifi interfaces.
  3. And in the third scenario, the user device is connected using 2G for both voice and data.  The 3G and Wifi interfaces are now turned off.

This has been showcased at the IEEE CAMAD conference where GREEN-T co-organized a special session in Barcelona – September 2012.


Enterprise Ireland.


Jesse Kielthy

Phone: +353 (0)51 83 4054