User Equipment, Network Node and Methods in a Wireless Communications Network

A User Equipment (UE) configured for resuming a Radio Resource Control (RRC) connection to a target cell in a wireless communications network, the UE comprising:

• memory;
• and
• a processing circuit operatively coupled to the memory and configured, by way of computer program instructions stored in said memory, to:
• when the target cell has been found, generate a security token, wherein an input value in a security token generating function comprises a set of input parameters, which set of input parameters is adapted to comprise at least a cell identifier of the target cell and an indication of a Public Land Mobile Network (PLMN) of the target cell, and
• send a resuming request to a target network node serving the target cell, which resuming request is adapted to comprise the security token.

The UE according to claim 33, wherein any of the cell identifier, and the indication of the PLMN of the target cell is adapted to be represented by any one or more out of:

• a PLMN Identity (PLMN ID),
• a Cell Identity (Cell ID),
• a hash and/or checksum of broadcasted system information or parts thereof comprising PLMN ID and Cell ID information,
• multiple PLMN IDs, wherein the Cell identity comprises multiple Cell IDs,
• a Tracking Area Code (TAC) associated to the PLMN, and
• a RAN Area Code (RANAC) associated to the PLMN.

A source network node configured for resuming a Radio Resource Control (RRC) connection of a User Equipment (UE) to a target cell in a wireless communications network, the source network node comprising:

• memory;
• and
• a processing circuit operatively coupled to the memory and configured, by way of computer program instructions stored in said memory, to:
• receive from a target network node serving the target cell, a security token,
• generate a security token, wherein an input value in a security token generating function is adapted to comprise a set of input parameters, which set of input parameters is adapted to comprise at least a cell identifier of the target cell and an indication of a Public Land Mobile Network (PLMN) of the target cell, and
• if the received security token is successfully verified when compared with the generated security token, provide to the target network node a UE context related to the RRC connection of the UE, to enable the target network node to resume the RRC connection.