(19)

(11)

EP 1 036 452 A1

(12)

(43) Date of publication: 20.09.2000 Bulletin 2000/38 (21) Application number: 98958945.2 (22) Date of filing: 10.12.1998

(51) International Patent Classification (IPC)7: H04L 27/20, H04L 27/12 (86) International application number: PCT/FI9800/964 (87) International publication number: WO 9933/237 (01.07.1999 Gazette 1999/26)

(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: 11.12.1997 FI 974495 (71) Applicant: Nokia Networks Oy 02150 Espoo (FI)	(72) Inventors: PIIRAINEN, Olli FIN-90100 Oulu (FI) NIEMELÄ, Kari FIN-90650 Oulu (FI) (74) Representative: Brockman, Pertti Erik et al Kolster Oy Ab,P.O. Box 148,Iso Roobertinkatu 23 00121 Helsinki 00121 Helsinki (FI)