(19)

(11)

EP 1 072 134 A1

(12)

(43) Date of publication: 31.01.2001 Bulletin 2001/05 (21) Application number: 99915785.2 (22) Date of filing: 16.04.1999

(51) International Patent Classification (IPC)7: H04L 27/20 (86) International application number: PCT/FI9900/312 (87) International publication number: WO 9955/048 (28.10.1999 Gazette 1999/43)

(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: 17.04.1998 FI 980861 (71) Applicant: Nokia Networks Oy 02150 Espoo (FI)	(72) Inventor: PIIRAINEN, Olli FIN-90100 Oulu (FI) (74) Representative: Brockman, Pertti Erik et al Kolster Oy Ab,P.O. Box 148,Iso Roobertinkatu 23 00121 Helsinki 00121 Helsinki (FI)