Mobility management entity, network entity, and method and computer readable medium therefor

A mobility management entity comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory and configured to:
• receive, from a network entity directly or through a subscriber server, a request message in order to configure the mobility management entity to report a second identifier to be used by a radio access network node to identify a radio terminal that establishes a radio connection with the radio access network node, the radio access network node being different from the network entity;
• and
• send the second identifier to the network entity directly or through the subscriber server, the second identifier including one or any combination of a C-RNTI, an MME UE S1AP ID, an eNB UE S1AP ID, an S1 S-GW TEID, and an S1 eNB TEID.

A method in a network entity, the method comprising:

• sending, to a mobility management entity or a subscriber server, a request message in order to configure the mobility management entity to report a second identifier to be used by a radio access network node to identify a radio terminal that establishes a radio connection with the radio access network node, the radio access network node being different from the network entity;
• receiving the second identifier from the mobility management entity directly or through the subscriber server, the second identifier including one or any combination of a C-RNTI, an MME UE S1AP ID, an eNB UE S1AP ID, an S1 S-GW TEID, and an S1 eNB TEID;
• and
• communicating with the radio access network node by using the second identifier.