Method or device for integrity protection

An integrity protection method for a Uu interface communication, comprising:

• obtaining a first BEARER parameter value based on at least one of the following:
• a bit length of a logical channel identity (LCD) for a sidelink communication, a BEARER parameter value allocated for the Uu interface communication, or a preset BEARER parameter value;
• and
• based on the first BEARER parameter value, calculating a Message Authentication Code-Integrity (MAC-I) or an eXpected Message Authentication Code-Integrity (XMAC-I) for the Uu interface communication.

An integrity protection device for a sidelink communication, comprising:

• a memory for storing computer programs;
• and
• a processor;
• wherein the processor is configured to execute the computer programs to:
• obtain a first BEARER parameter value based on at least one of the following:
• a logical channel identity (LCD) corresponding to data transmitted in the sidelink communication, an access communication standard adopted by the sidelink communication, a BEARER parameter value allocated for the sidelink communication, or a preset BEARER parameter value, wherein a bit length of the LCID corresponding to the transmitted data is greater than a bit length of the first BEARER parameter value;
• and
• based on the first BEARER parameter value, calculate a Message Authentication Code-Integrity (MAC-I) or an eXpected Message Authentication Code-Integrity (XMAC-I) for the sidelink communication.