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US 7,120,421 B2Granted
Wireless network with a cipher key change procedure
AssigneeKoninklijke Philips Electronics N.V.
InventorsChristoph Hermann, Josef Wasel
Life of this patent
Estimating the term…
Abstract
The invention relates to a wireless network comprising a radio network controller and a plurality of assigned terminals which are provided for coding certain data to be transmitted over traffic and control channels and which are provided for changing the respective key necessary for the coding at certain instants. The radio network controller sends a message about a change of the key coded with an old cipher key to a terminal. The terminal responds with a message coded with a new cipher key as an acknowledgement for the new cipher key.
Claims25
A wireless network, comprising:
- a radio network controller;
- and
- a terminal,
- wherein the radio network controller is for transmitting a first message to the terminal, the first message at least indicating an initiation of a cipher key change, and
- wherein the terminal is for transmitting a second message to the radio network controller upon or subsequent to reception of the first message by the terminal, the second message being coded with a new cipher key as an acknowledgement of the cipher key change by the terminal, and
- wherein the radio network controller is for transmitting a third message to the terminal upon or subsequent to reception of the second message by the radio network controller, the third message at least indicating a deciphering by the radio network controller of the second message with the new cipher key or a failure by the radio network controller to decipher the second message with the new cipher key.
3 more elements
A radio network controller, comprising:
- means for transmitting a first message to a terminal, the first message at least indicating an initiation of a cipher key change;
- means for receiving a second message from the terminal upon or subsequent to reception of the first message by the terminal, the second message being coded with a new cipher key as an acknowledgement of the cipher key change by the terminal;
- and
- means for transmitting a third message to the terminal upon or subsequent to reception of the second message by the radio network controller, the third message at least indicating a deciphering by the radio network controller of the second message with the new cipher key or a failure by the radio network controller to decipher the second message with the new cipher key.
1 more element
A terminal, comprising:
- means for receiving a first message from a radio network controller, the first message at least indicating an initiation of a cipher key change;
- means for transmitting a second message to the radio network controller upon or subsequent to reception of the first message by the terminal, the second message being coded with a new cipher key as an acknowledgement of the cipher key change by the terminal;
- and
- means for receiving a third message from the radio network controller upon or subsequent to reception of the second message by the radio network controller, the third message at least indicating a deciphering by the radio network controller of the second message with the new cipher key or a failure by the radio network controller to decipher the second message with the new decipher key.
1 more element
A method of operating a wireless network including a radio network controller and a terminal, the method comprising the steps of:
- transmitting, via the radio network controller, at least a first message to the terminal, the first message at least indicating an initiation of a cipher key change;
- transmitting, via the terminal, a second message to the radio network controller upon or subsequent to a reception of the first message by the terminal, the second message being coded with either an old cipher key or a new cipher key as an acknowledgement of the cipher key change;
- and
- transmitting, via the radio network controller, a third message to the terminal upon or subsequent to a reception of the second message by the radio network controller, the third message at least indicating a deciphering by the radio network controller of the second message with the new cipher key or a failure by the radio network controller to decipher the second message with the new decipher key.
1 more element
A radio network controller, comprising:
- means for transmitting a first message to a terminal, the first message at least indicating an initiation of a cipher key change;
- means for receiving a second message from the terminal upon or subsequent to a reception of the first message by the terminal, the second message being coded with either of an old cipher key or a new cipher key as an acknowledgement of the cipher key change by the terminal;
- and
- means for transmitting a third message to the terminal upon or subsequent to a reception of the second message by the radio network controller, the third message at least indicating a deciphering by the radio network controller of the second message with the new cipher key or a failure by the radio network controller to decipher the second message with the new decipher key.
1 more element
A terminal, comprising:
- means for receiving a first message from a radio network controller, the first message at least indicating an initiation of a cipher key change involving an old cipher key and a new cipher key;
- and
- means for transmitting a second message to the radio network controller upon or subsequent to a reception of the first message by the terminal, the second message being coded with one of the old cipher key or the new cipher key as an acknowledgement of the cipher key change by the terminal;
- and
- means for receiving a third message from the radio network controller upon or subsequent to a reception of the second message by the radio network controller, the third message being coded with one of the old cipher key or the new cipher key as an indication of one of a successful termination of an unsuccessful termination of the cipher key change.
2 more elements
Dependencies are inferred from the claim text.