(19)

(11)

EP 2 401 850 A2

(12)

(88) Date of publication A3: 21.10.2010 (43) Date of publication: 04.01.2012 Bulletin 2012/01 (21) Application number: 10708354.5 (22) Date of filing: 26.02.2010

(51) International Patent Classification (IPC):  H04L 29/06(2006.01) H04W 4/14(2009.01) H04W 12/02(2009.01) (86) International application number: PCT/GB2010/000341 (87) International publication number: WO 2010/097590 (02.09.2010 Gazette 2010/35)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 26.02.2009 GB 0903313 16.03.2009 GB 0904503 (71) Applicant: Sepura PLC Cambridge CB4 1GR (GB)	(72) Inventors: RAYNE, Mark, Wentworth Cambridgeshire CB6 3ND (GB) LANGFORD, Nicholas, Alan, Stewart Cambridgeshire CB6 3JH (GB) (74) Representative: Tothill, John Paul  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)