(19)

(11)

EP 1 738 555 A1

(12)

(43) Date of publication: 03.01.2007 Bulletin 2007/01 (21) Application number: 05732863.5 (22) Date of filing: 12.04.2005

(51) International Patent Classification (IPC):  H04L 29/06(2006.01) (86) International application number: PCT/GB2005/001394 (87) International publication number: WO 2005/101787 (27.10.2005 Gazette 2005/43)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 19.04.2004 GB 0408687 (71) Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. Kadoma-shi, Osaka 571-8501 (JP)	(72) Inventor: TABATABAIAN, Seyed Thatcham, Berkshire, RG19 3TF (GB) (74) Representative: Dawson, Elizabeth Ann et al A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)