Telecommunications – Radiotelephone system
Reexamination Certificate
2005-06-21
2005-06-21
Beamer, Temica M. (Department: 2681)
Telecommunications
Radiotelephone system
C455S410000, C455S411000, C455S422100, C380S249000, C380S250000
Reexamination Certificate
active
06909887
ABSTRACT:
The infrastructure has a core network, radio network controllers linked to the core network and base stations provided with radio interfaces and each linked to one of the controllers. Ciphered information is transmitted over a first communication path in circuit mode between the core network and the terminal, passing through a first master controller, then over a second communication path in circuit mode between the core network and the terminal, passing through a second master controller. The second path is established in a transfer procedure comprising the transmission of adjustment data from the first to the second master controller and the suppression of the first path. These data are representative of a current value of a sequence number used to encipher the information and incremented at regular intervals, and of an offset between this sequence number and a time reference available to the second controller.
REFERENCES:
patent: 2 236 458 (1991-04-01), None
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patent: WO 93 25021 (1993-12-01), None
patent: WO 98 09458 (1998-03-01), None
Technical Specification 3G TS 25.301, “Radio Interface Protocol”, version 3.4.0, Publication of the 3rdGeneration Partnership Project, Mar. 2000.
Technical Specification 3G TS 25.321, “MAC Protocol Specification”, version 3.3.0, Publication of the 3rdGeneration Partnership Project, Mar. 2000.
Technical Specification 3G TS 25.331, “RRC Protocol Specification”, version 3.2.0, Publication of the 3rdGeneration Partnership Project, Mar. 2000.
Technical Specification 3G TS 25.401, “UTRAN Overall Description”, version 3.1.0, Publication of the 3rdGeneration Partnership Project, Jan. 2000.
Technical Specification 3G TR 25.832, “Manifestations of Handover and SRNS Relocation”, version 3.0.0, Publication of the 3rdGeneration Partnership Project, Oct. 1999.
Fauconnier Denis
Mousset Claire
Beamer Temica M.
DLA Piper Rudnick Gray Cary US LLP
Nortel Networks Limited
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