(19)

(11)

EP 0 940 018 A1

(12)

(43) Date of publication: 08.09.1999 Bulletin 1999/36 (21) Application number: 97937738.0 (22) Date of filing: 29.08.1997

(51) International Patent Classification (IPC):  H04J 3/ 00( . ) H04B 7/ 185( . ) H04W 68/ 00( . ) H04B 7/ 15( . ) H04B 7/ 26( . ) H04W 68/ 02( . ) (86) International application number: PCT/GB1997/002328 (87) International publication number: WO 1998/023045 (28.05.1998 Gazette 1998/21)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 20.11.1996 GB 19960024104 (71) Applicant: ICO Services Ltd. London W6 9BN (GB)	(72) Inventors: CHAMBERS, Charles Great Shelford, Cambridge CB2 (GB) CHAMBERS, Paul High Wycombe, Bucks HP13 7LJ (GB) BJORNSTROM, Gunnar, Arvid London W6 9BN (GB) (74) Representative: Read, Matthew Charles, et al  Venner Shipley & Co. 20 Little Britain London EC1A 7DH London EC1A 7DH (GB)