(19)

(11)

EP 0 980 552 A1

(12)

(43) Date of publication: 23.02.2000 Bulletin 2000/08 (21) Application number: 98917175.6 (22) Date of filing: 04.05.1998

(51) International Patent Classification (IPC)7: G06F 15/02, G01S 5/00 (86) International application number: PCT/FI9800/377 (87) International publication number: WO 9853/405 (26.11.1998 Gazette 1998/47)

(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: 05.05.1997 FI 971915 30.09.1997 FI 973848 (71) Applicant: Nokia Networks Oy 02150 Espoo (FI)	(72) Inventors: WESBY, Philip, B. FIN-02600 Espoo (FI) AHNLUND, Hans, K., O. FIN-00100 Helsingfors (FI) (74) Representative: Antila, Harri Jukka Tapani et al Kolster Oy Ab,P.O. Box 148,Iso Roobertinkatu 23 00121 Helsinki 00121 Helsinki (FI)