SOLDER stands for Spectrum OverLay through aggregation of heterogeneous DispERsed Bands. It is EU 7th Framework Program project with a budget of 3 275 296 EUR and a consortium consisting of the following partners: IS-Wireless, Thales, Sequans, ISI, Kings College London, Eurocom.

The goal of SOLDER is to develop a new spectrum overlay technology, which will provide the efficient aggregation of non-continuous dispersed spectrum bands licensed to heterogeneous networks (HetNets) and heterogeneous Radio Access Technology (h-RATs).

Within 5GNOW SOLDER IS-Wireless is responsible for radio resource management, scheduler implementation and MAC layer design implementation and system-level simulations.

Project Deliverables

  • D2.1 Carrier Aggregation over HetNets and h-RATs: Objectives, Scenarios and Requirements – Download
  • D2.2 Component-level requirements for scenarios and use cases – Download 
  • D2.3 System-Level Requirements for Scenarios and Use Cases – Download
  • D3.1 Initial report of heterogeneous Carrier Aggregation in LTE-A and Beyond – Download 
  • D3.2 Innovative solution for Carrier Aggregation in h-RATs, LTE-A and Beyond – Download
  • D3.3 Final report, Carrier aggregation in h-RATs: PHY, and system results – Download
  • D4.1 PoC Scenarios and system interfaces – Download
  • D4.2 PoC Scenarios and system interfaces – Download
  • D4.3 Experimental analysis of the integrated SOLDER system – Download


  • Kaltenberger F., Foukalas F., Holland O., Pietrzyk S., Thao S., Vivier G., “Spectrum overlay through aggregation of heterogeneous dispersed bands”, European Conference on Networks and Communications (EuCNC), pp. 1-5, June 2014.
  • Kaltenberger, F.; Roux, C.; Buczkowski, M. & Wewior, M., “The OpenAirInterface Application Programming Interface for Schedulers using Carrier Aggregation”, International Symposium on Wireless Communication Systems (ISWCS): SAS5G: Workshop on Spectrum Aggregation and Sharing for 5G Networks (ISWCS’2016 – SAS5G Workshop), 20-23 September 2016.
  • Holland O., Aijaz A., Kaltenberger F., Foukalas F., Vivier G., Buczkowski M., Pietrzyk S., „Management architecture for aggregation of heterogeneous systems and spectrum bands”, IEEE Communications Magazine, September 2016

Tutorials / Panels / Presentation

  • Pietrzyk, S. “System-level modelling of HetNets, Carrier Aggregation and Scheduling in MATLAB”, IEEE Globecom, December 2015 – View materials
  • Jemielity, M. “Custom eNB scheduler and lessons learnt from OAI development” , OAI Eurecom, May 2016 – View materials
  • Kaltenberger F., “Carrier aggregation implementation on the open airinterface platform”, Crowncom, Grenoble (France), 1 June 2016 – View materials