(19)

(11)

EP 1 636 947 A2

(12)

(88) Date of publication A3: 31.03.2005 (43) Date of publication: 22.03.2006 Bulletin 2006/12 (21) Application number: 04724617.8 (22) Date of filing: 31.03.2004

(51) International Patent Classification (IPC):  H04L 12/56(1990.01) (86) International application number: PCT/EP2004/050399 (87) International publication number: WO 2004/109989 (16.12.2004 Gazette 2004/51)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 06.06.2003 GB 0313099 (71) Applicant: MOTOROLA, INC. Schaumburg, IL 60196 (US)	(72) Inventors: BARRETT, Stephen Thatcham Berkshire RG18 9DX (GB) VILLIER, Eric Wiltshire SN2 3WG (GB) LEGG, Peter Wiltshire SN2 6MG (GB)