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Submitted on: 03 July 2011.
Revised on: 23 August 2011.
Accepted on: 06 October 2011.
___________________Annals of Telecommunications---SPRINGER INT PUBL AG
Submitted on: 12 March 2019.
Revised on: 19 April 2019.
Accepted on: 31 May 2019.
___________________Annals of Telecommunications---SPRINGER INT PUBL AG
Submitted on: 18 March 2002.
Revised on: 13 May 2002.
Accepted on: 27 June 2002.
___________________Annals of Telecommunications---SPRINGER INT PUBL AG
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