Method of verifying an operation of a mobile radio communication network

A method of verifying an operation of a mobile radio communication network, the method comprising:

• receiving an Initiation Message from a first network entity at a second network entity, the Initiation Message defining an undo request and comprising an UNDO section defining an undo area, a TRIGGERING_CM section indicating changes to the network, and an ASSISTANCE section;
• creating and sending an Assistance-Response Message, the Assistance-Response Message comprising the UNDO section, and an ASSISTED_CM section;
• and
• receiving an Assistance-Acknowledge Message including an ACK flag and the UNDO section from the first network entity at the second network entity.

A first network entity for a mobile radio communication network, wherein the first network entity is configured to:

• send an Initiation Message to a second network entity, the Initiation Message defining an undo request and comprising an UNDO section defining an undo area, a TRIGGERING_CM section indicating changes to the network, and an ASSISTANCE section;
• receive an Assistance-Response Message, the Assistance-Response Message comprising the UNDO section, and an ASSISTED_CM section;
• and
• send an Assistance-Acknowledge Message including an ACK flag and the UNDO section to the second network entity.

A second network entity for a mobile radio communication network, the second network entity configured to:

• receive an Initiation Message from a first network entity, the Initiation Message defining an undo request and comprising an UNDO section defining an undo area, a TRIGGERING_CM section indicating changes to the network, and an ASSISTANCE section;
• create and send an Assistance-Response Message, the Assistance-Response Message comprising the UNDO section, and an ASSISTED_CM section;
• and
• receive an Assistance-Acknowledge Message including an ACK flag and the UNDO section from the first network entity.