Network apparatus, base station, communication method, radio resource control method, and non-transitory computer readable medium

A base station comprising:

• a communication unit configured to receive, from a network apparatus, an instruction message when allocable radio resources are insufficient or the allocable radio resources are expected to become insufficient, the instruction message indicating a stop of using some of frequency bands for a communication terminal performing communication using a plurality of frequency bands simultaneously;
• an evaluation unit configured to evaluate as to whether or not the allocable radio resources are insufficient or whether or not the allocable radio resources are expected to become insufficient;
• and
• a control unit configured to stop, when the evaluation unit evaluates that the allocable radio resources are insufficient or the allocable radio resources are expected to become insufficient, the some of the frequency bands for the communication terminal performing the communication using the plurality of frequency bands simultaneously.

A radio resource control method comprising:

• receiving, from a network apparatus, an instruction message when allocable radio resources are insufficient or the allocable radio resources are expected to become insufficient, the instruction message indicating a stop of using some of frequency bands for a communication terminal performing communication using a plurality of frequency bands simultaneously;
• evaluating as to whether or not the allocable radio resources are insufficient or whether or not the allocable radio resources are expected to become insufficient;
• and
• stopping, when it is evaluated that the allocable radio resources are insufficient or the allocable radio resources are expected to become insufficient, using the some of the frequency bands for the communication terminal performing the communication using the plurality of frequency bands simultaneously.