Radio access network apparatus, controlling method, mobile communication system, and non-transitory computer readable medium embodying instructions for controlling a device

A radio access network apparatus comprising:

• a first storage are and a second storage area different from the first storage area;
• a receiver that receives, from at least one mobile station, a plurality of request signals, each comprising context information used to communicate with a mobile station;
• a detector that detects a number of the plurality request signals received by the receiver;
• and
• a controller
• wherein, when a number of the plurality of request signals received by the receiver exceeds a predetermined number, the controller controls storage of the context information in the first storage area, in response to receiving the request signal, and
• wherein, when a number of the plurality of request signals received by the receiver does not exceed the predetermined number, the controller controls storage of the context information in the second storage area, in response to receiving the request signal.

A control method for a radio access network apparatus, the method comprising:

• receiving, from a mobile station, a request signal comprising context information used to communicate with the mobile station;
• in response to receiving the request signal, allocating a sub-section of a first storage area for storing the context information;
• receiving, from the mobile station, a completion signal that indicates that a connection with the mobile station is established, and
• in response to receive the completion signal, allocating a sub-section of a second storage area, different from the first storage area, for storing the context information previously allocated to the sub-section of the first storage area.

A mobile communication system comprising:

• a mobile station;
• and
• a radio access network apparatus,
• wherein the radio access network apparatus comprises:
• a first storage area and a second storage area different from the first storage area;
• a receiver that receives, from the mobile station, a request signal comprising context information used to communicate with the mobile station and subsequently receives, from the mobile station, a completion signal that indicates that a connection with the mobile station is established;
• a controller that controls storage of the context information in the first storage area in response to receiving the request signal and that controls storage of the context information in the second storage area in response to receiving the completion signal;
• and
• wherein the mobile station comprises:
• a transmitter that transmits, to the radio access network apparatus, the request signal and the completion signal.

A non-transitory computer readable medium embodying instructions for controlling a device to implement a control method for radio access network apparatus, the control method comprising:

• receiving, from a mobile station, a request signal comprising context information used to communicate with the mobile station;
• in response to receiving the request signal, allocating a sub-section of a first storage area for storing the context information;
• receiving, from the mobile station, a completion signal that indicates that the connection with the mobile station is established, and
• in response to receive the completion signal, allocating a sub-section of a second storage area, different from the first storage area, for storing the context information previously allocated to the sub-section of the first storage area.