Communication control method, master base station, secondary base station, and user terminal

A secondary evolved Node-B (SeNB) that connects to a user terminal together with a master evolved Node-B (MeNB) in a dual connectivity scheme, the SeNB comprising:

• a receiver configured to receive an SeNB modification request message from the MeNB after the SeNB prepares resources for the dual connectivity scheme, via an X2 interface established between the MeNB and the SeNB, and the SeNB modifies the resources for the dual connectivity scheme based on the received SeNB modification request message, wherein
• the SeNB modification request message requests the SeNB to modify the resources for the dual connectivity scheme,
• the SeNB modification request message includes identification information of a serving gateway connected with the MeNB via an S1 interface, the serving gateway included in an evolved packet core (EPC) and performing transfer control of data, and
• the identification information includes an S1 tunnel endpoint ID (S1-TEID) of the serving gateway and an internet protocol (IP) address of the serving gateway.

An apparatus comprising:

• a processor and a memory coupled to the processor, the processor configured to control a master evolved Node-B (MeNB) that connects to a user terminal together with a secondary evolved Node-B (SeNB) in a dual connectivity scheme, wherein
• the processor executes a process of transmitting an SeNB modification request message to the SeNB after the SeNB prepares resources for the dual connectivity scheme, via an X2interface established between the MeNB and the SeNB,
• the SeNB modification request message requests the SeNB to modify the resources for the dual connectivity scheme,
• the SeNB modification request message includes identification information of a serving gateway connected with the MeNB via an S1 interface, the serving gateway included in an evolved packet core (EPC) and performing transfer control of data, and
• the identification information includes an S1 tunnel endpoint ID (S1-TEID) of the serving gateway and an internet protocol (IP) address of the serving gateway.

An apparatus comprising:

• a processor and a memory coupled to the processor, the processor configured to control a secondary evolved Node-B (SeNB) that connects to a user terminal together with a master evolved Node-B (MeNB) in a dual connectivity scheme, wherein
• the processor executes a process of receiving an SeNB modification request message from the MeNB after the SeNB prepares resources for the dual connectivity scheme, via an X2interface established between the MeNB and the SeNB, and the SeNB modifies the resources for the dual connectivity scheme based on the received SeNB modification request message,
• the SeNB modification request message requests the SeNB to modify the resources for the dual connectivity scheme,
• the SeNB modification request message includes identification information of a serving gateway connected with the MeNB via an S1 interface, the serving gateway included in an evolved packet core (EPC) and performing transfer control of data, and
• the identification information includes an S1 tunnel endpoint ID (S1-TEID) of the serving gateway and an internet protocol (IP) address of the serving gateway.