(19)
(11) EP 1 610 474 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
26.04.2006 Bulletin 2006/17

(43) Date of publication:
28.12.2005 Bulletin 2005/52

(21) Application number: 05108181.8

(22) Date of filing: 05.11.1999
(51) International Patent Classification (IPC): 
H04B 7/26(1974.07)
 H04L 9/00(1968.09)
(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 LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 05.11.1998 FI 982399
08.03.1999 FI 990499
25.05.1999 FI 991184

(62) Application number of the earlier application in accordance with Art. 76 EPC:
99956044.4 / 1125449

(71) Applicant: Nokia Corporation
02150 Espoo (FI)

(72) Inventors:
  • Longoni, Fabio
    20020 Arese (Milan) (IT)
  • Vialén, Jukka
    02300 Espoo (FI)
  • Niemi, Valtteri
    00180 Helsinki (FI)
  • Ranta, Jukka
    20300 Turku (FI)

(74) Representative: Äkräs, Tapio Juhani 
Kolster Oy Ab,P.O. Box 148, Iso Roobertinkatu 23
00121 Helsinki
00121 Helsinki (FI)

 
Remarks:
This application was filed on 07-09-2005 as a divisional application to the application mentioned under INID code 62.
Remarks:
A request for correction of the text of claim 19 has been filed pursuant to R.88 EPC. A decision on the request will be taken during proceedings before the Examining Division (Guidelins for Examination in the EPO A-V, 3.).
 


(54) Mechanism for encrypting transmission of frames


(57) A mechanism for encrypting transmission of frames in a telecommunications network comprising a mobile station (MS), a radio network controller (SRNC) and at least one base station (BS1, BS2). The mobile station (MS) and each base station (BS1,BS2) have a corresponding timing reference (MSFN,BS1FN,BS2FN). The mechanism comprises the step of establishing a connection-specific timing reference which is common to all nodes (MS,BS1,BS2,RNC) involved in the connection and which comprises a common frame numbering scheme agreed between the mobile station (MS) and the radio network controller (SRNC) while establishing the connection, wherein said reference comprises a connection-specific frame number (CFN) and a frame number extension (HFN); the mobile station (MS) and the radio network controller (SRNC) use the CFN and the HFN for ciphering and deciphering the frames.