(19)

(11)

EP 1 745 617 A1

(12)

(43) Date of publication: 24.01.2007 Bulletin 2007/04 (21) Application number: 05734759.3 (22) Date of filing: 18.04.2005

(51) International Patent Classification (IPC):  H04L 25/02(2006.01) (86) International application number: PCT/JP2005/007747 (87) International publication number: WO 2005/109805 (17.11.2005 Gazette 2005/46)

(84) Designated Contracting States: DE FR GB (30) Priority: 10.05.2004 JP 2004140488 01.12.2004 US 238 (71) Applicant: SONY CORPORATION Tokyo 141-0001 (JP)	(72) Inventor: TAKANO, Hiroaki, c/o Sony Corporation Tokyo 141-0001 (JP) (74) Representative: Körber, Martin Hans  Mitscherlich & Partner Patentanwälte Sonnenstrasse 33 80331 München 80331 München (DE)