(19)

(11)

EP 1 769 616 A2

(12)

(88) Date of publication A3: 13.07.2006 (43) Date of publication: 04.04.2007 Bulletin 2007/14 (21) Application number: 05761018.0 (22) Date of filing: 18.07.2005

(51) International Patent Classification (IPC):  H04L 29/06(2006.01) (86) International application number: PCT/EP2005/053461 (87) International publication number: WO 2006/008290 (26.01.2006 Gazette 2006/04)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 21.07.2004 US 896353 21.07.2004 US 896316 (71) Applicant: International Business Machines Corporation Armonk, New York 10504 (US)

(72) Inventors: HINTON, Heather, Maria Austin, Texas 78732 (US) FALOLA, Dolapo, Martin Austin, Texas 78717 (US) MORAN, Anthony, Scott Santa Cruz, California 95060 (US) WARDROP, Patrick, Ryan Austin, Texas 78728 (US) (74) Representative: Watson, Justine Nicola C.  IBM United Kingdom Limited, Intellectual Property Department, Hursley Park Winchester, Hampshire SO21 2JN Winchester, Hampshire SO21 2JN (GB)