There is disclosed a method in a User Equipment, UE, for enabling interception, decoding and/or processing of at least parts of a Media Access Control, MAC, level message. The method comprises the steps of receiving configuration information comprising information to add additional information to a MAC level message, and creating a bit string representing the additional information. The method also comprise the step of adding the created bit string to the MAC level message, to enable a recipient of said MAC level message to determine, based on the additional information represented by the bit string, whether at least part of a payload of the MAC level message is to be intercepted, decoded and/or processed. There is further disclosed a method in a base station for decoding a corresponding MAC level message. A corresponding User Equipment, UE, and a base station configured for the methods are also disclosed.