(19)

(11)

EP 1 652 341 A2

(12)

(88) Date of publication A3: 19.05.2005 (43) Date of publication: 03.05.2006 Bulletin 2006/18 (21) Application number: 04743993.0 (22) Date of filing: 15.07.2004

(51) International Patent Classification (IPC):  H04L 12/26(1990.01) H04L 12/28(1990.01) H04L 29/06(1990.01) (86) International application number: PCT/IB2004/002332 (87) International publication number: WO 2005/011195 (03.02.2005 Gazette 2005/05)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 24.07.2003 GB 0317308 (71) Applicant: Koninklijke Philips Electronics N.V. 5621 BA Eindhoven (NL)	(72) Inventor: CHIMOMBO, Christopher Z., Philips IP & Standards Redhill, Surrey RH1 5HA (GB) (74) Representative: White, Andrew Gordon  Philips Intellectual Property & Standards, Cross Oak Lane Redhill, Surrey RH1 5HA Redhill, Surrey RH1 5HA (GB)