(19)

(11)

EP 1 751 921 A1

(12)

(43) Date of publication: 14.02.2007 Bulletin 2007/07 (21) Application number: 05736226.1 (22) Date of filing: 12.05.2005

(51) International Patent Classification (IPC):  H04L 12/28(2006.01) H04L 29/06(2006.01) (86) International application number: PCT/IB2005/051564 (87) International publication number: WO 2005/112354 (24.11.2005 Gazette 2005/47)

(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 MC NL PL PT RO SE SI SK TR (30) Priority: 13.05.2004 US 570638 P 30.09.2004 US 614717 P (71) Applicant: Koninklijke Philips Electronics N.V. 5621 BA Eindhoven (NL)	(72) Inventors: LI, Pen, C. Briarcliff Manor, NY 10510-8001 (US) GARG, Parag Briarcliff Manor, NY 10510-8001 (US) GHOSH, Monisha Briarcliff Manor, NY 10510-8001 (US) (74) Representative: Rolfes, Johannes Gerardus Albertus  Philips Intellectual Property & Standards P.O. Box 220 5600 AE Eindhoven 5600 AE Eindhoven (NL)