name: IM
full_form: IP Multimedia
context: If integrity protection is in use, the integrity mode bit (IM) indicates the behaviour of the LLC layer at the receiving side if the MAC verification fails. The IM bit replaces PM bit in legacy UI frame content. The IM bit is set to 1 to indicate that in the case of MAC verification fails, the message is discarded, and not delivered to the upper layer. NOTE: It is possible that this one message type (when I_bit = 1 and IM_bit = 1) includes both the FCS field and MAC. From security point of view, however, this is not required. The functionality that would be achieved by including both fields would be that messages that may include bit errors are still discarded. However, protecting the FCS field with the integrity key would not provide enhanced security because the assumption in this special case is that the verification of the MAC will fail. The FCS field can be modified by third parties. The IM bit is set to 0 to indicate that in the case of MAC verification fails, the message is not
description: The Integrity Mode (IM) bit is a parameter used in the LLC layer to determine the behavior when integrity protection is enabled and MAC verification fails. It indicates whether the message should be discarded or delivered to the upper layer.
explanation: The context explicitly describes IM as a bit that influences the behavior of the LLC layer under specific conditions, making it a critical network attribute for operation, thus classifying it as a Parameter.
section_title: 6.8.2	Integrity protection bit, integrity mode bit and MAC
biotag_Context: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,B-Protocol,O,O,O,B-Service,O,O,B-Service,O,O,O,B-Parameter,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Procedure,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Procedure,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,B-Procedure,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O
biotag_Description: O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O