(19)

(11)

EP 1 057 302 A1

(12)

(43) Date of publication: 06.12.2000 Bulletin 2000/49 (21) Application number: 99965516.0 (22) Date of filing: 17.12.1999

(51) International Patent Classification (IPC)7: H04L 12/28 (86) International application number: PCT/EP9910/197 (87) International publication number: WO 0039/964 (06.07.2000 Gazette 2000/27)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 29.12.1998 US 222403 (71) Applicant: Koninklijke Philips Electronics N.V. 5621 BA Eindhoven (NL)	(72) Inventor: CHENG, Doreen, Y. NL-5656 AA Eindhoven (NL) (74) Representative: Hoekstra, Jelle  Internationaal Octrooibureau B.V.Prof. Holstlaan 6 5656 AA Eindhoven 5656 AA Eindhoven (NL)