Method and apparatus for reducing overhead for integrity check of data in wireless communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsYoung-Kyo Baek, Ji-Cheol Lee, Jung-Je Son
Life of this patent
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Abstract
A method and an apparatus reduce overhead for data integrity checks in a wireless communication system. When receiving a message, a first Integrity Check Value (ICV) is compared with a second ICV to detect an integrity error in the message. When the integrity error exists in the message, a frequency of the integrity error is counted. When the frequency of the integrity error is more than a threshold, a key update procedure is performed. Therefore, the overhead of the information for integrity check may be reduced in the wireless communication system.
Claims14
A method for operating a base station in a wireless communication system, the method comprising:
- receiving, from a terminal, a message;
- detecting an integrity check value (ICV) error of the message, while a first traffic encryption key (TEK) for downlink is a first key and a second TEK for uplink is a second key;
- determining that update of the second TEK used for encrypting data by the terminal is required due to the ICV error;
- performing a first key update procedure by discarding the first key, using the second key associated with the ICV error as the first TEK, deriving a third key, and using the third key as the second TEK;
- after performing the first key update procedure, performing a second key update procedure by discarding the second key, using the third key as the first TEK, deriving a fourth key, and using the fourth key as the second TEK;
- transmitting, to the terminal, a TEK invalid message informing that a TEK is invalid, after performing the second key update procedure;
- receiving, from the terminal, a TEK request message, after transmitting the TEK invalid message;
- and
- transmitting, to the terminal, a TEK_reply message comprising the third key and the fourth key.
An apparatus of a base station in a wireless communication system, the apparatus comprising:
- a transceiver;
- and
- at least one processor coupled to the transceiver and configured to:
- receive, from a terminal, a message,
- detect an integrity check value (ICV) error of the message, while a first traffic encryption key (TEK) for downlink is a first key and a second TEK for uplink is a second key,
- determine that update of the second TEK used for encrypting data by the terminal is required due to the ICV error,
- perform a first key update procedure by discarding the first key, using the second key associated with the ICV error as the first TEK, deriving a third key, and using the third key as the second TEK,
- after performing the first key update procedure, perform a second key update procedure by discarding the second key, using the third key as the first TEK, deriving a fourth key, and using the fourth key as the second TEK,
- transmit, to the terminal, a TEK invalid message informing that a TEK is invalid, after performing the second key update procedure,
- receive, from the terminal, a TEK request message, after transmitting the TEK invalid message, and
- transmit, to the terminal, a TEK_reply message comprising the third key and the fourth key.
Dependencies are inferred from the claim text.