1. Nokia Siemens Networks Portugal, Amadora, Portugal and University of Beira Interior Covilhã, Portugal
2. University of Coimbra and Institute of Telecommunications, Aveiro, Portugal
3. University of Beira Interior and Institute of Telecommunications, Covilha, Portugal
4. University of Coimbra and Institute of Telecommunications, Coimbra, Portugal
5. Nokia Siemens Networks Portugal and Institute of Telecommunications, Aveiro, Portugal