Radio network node, ue and methods performed therein for handling communication in a wireless communication network

A method performed by a radio network node for handling communication of a user equipment, UE, in a wireless communication network, the method comprising:

• transmitting, to the UE, a mobile identifier in a message during a transition of states of the UE, wherein a length of the mobile identifier is based on one or more types of radio access technologies, RAT, of cells in a registration area configuration of the UE, and wherein the mobile identifier is associated with a UE context of the UE.

(canceled)

A user equipment, UE, for handling communication in a wireless communication network, wherein the UE is capable of receiving a registration area configuration including area identifiers associated with different radio cells of different radio access technologies, wherein the UE is configured to:

• receive, from a radio network node, a first mobile identifier and a second mobile identifier in a message during a transition of states of the UE, wherein the first mobile identifier is of a first length and the second mobile identifier is of a second length being different than the first length;
• and
• use the first mobile identifier to resume to a first radio network node of a first RAT in the registration area configuration of the UE, and the second mobile identifier to resume to a second radio network node of a second RAT in the registration area configuration of the UE.

A radio network nod for handling communication of a user equipment, UE, in a wireless communication network, wherein the radio network node is configured to:

• transmit, to the UE, a mobile identifier in a message during a transition of states of the UE, wherein a length of the mobile identifier is based on one or more types of RATs of cells in a registration area configuration of the UE, and wherein the mobile identifier is associated with a UE context of the UE.

(canceled)