Communication terminal and communication method

1. A communication terminal in which a plurality of communication protocols are executed, the communication terminal comprising:

a communication device configured to form an association with communication equipment and communicate with the communication equipment based on the association;

a communication managing unit configured to decide an operational mode of the communication device; and

a device power managing unit configured to control power state of the communication device in accordance with an operational mode decided by the communication managing unit,

wherein the device power managing unit sets, when a first operational mode is decided by the communication managing unit, the communication device in a first power state, the first power state being a state in which transmission and reception are not allowed, and then transitions a power state of the communication device from the first power state to a second power state at a first cycle temporarily during when the communication device is in the first power state, the second power state being a state in which transmission and reception are allowed, and

wherein the communication terminal selects a frame based on an execution situation of the plurality of communication protocols when the communication device is set in the second power state, and

the communication terminal returns the communication device to the first power state after receiving a response frame to the selected frame.

2. The communication terminal according to claim 1 ,

wherein the device power managing unit returns the communication device to the first power state after a first period elapses from when the second power state is set.

3. The communication terminal according to claim 1 ,

wherein the communication device discards the association in a case where the response frame is not received.

4. The communication terminal according to claim 1 ,

wherein the device power managing unit transitions, in a case that the first power state is set due to the first operational mode, a power state of the communication device from the first power state to a third power state at a second cycle for a second period where reception is allowed, and

wherein the communication device tries to receive a beacon that includes a presence notification of communication equipment with a predetermined channel in the second period.

5. The communication terminal according to claim 1 , further comprising:

a connection processing unit configured to establish a connection with the communication equipment or establish a connection with a first communication terminal through the communication equipment which carries out a relay,

wherein the communication managing unit decides an operational mode of the communication device to the first operational mode when the connection is released.

6. The communication terminal according to claim 1 , further comprising:

a connection processing unit configured to establish a connection with the communication equipment or establish a connection with a first communication terminal through the communication equipment which carries out a relay,

wherein the communication managing unit decides an operational mode of the communication device to the first operational mode when it is detected that a session on the connection has ended.

7. The communication terminal according to claim 1 , further comprising:

a display unit configured to display whether or not the association is being formed when the communication device is in the second power state.

8. A communication method performed in a communication terminal in which a plurality of communication protocols are executed, the method comprising:

forming an association between a communication device in the communication terminal and communication equipment and communicating with the communication equipment based on the association;

deciding an operational mode of the communication device;

controlling feeding of power to the communication device in accordance with an operational mode decided;

setting, when a first operational mode is decided, the communication device in a first power state, the first power state being a state in which transmission and reception are not allowed, and then transitioning the communication device from the first power state to a second power state at a first cycle temporarily during when the communication device is in the first power state, the second power state being a state in which transmission and reception are allowed;

selecting a frame based on an execution situation of the plurality of the communication protocols when the communication device is set in the second power state, and transmitting the selected frame via the association; and

returning the communication device to the first power state after receiving a response frame to the selected frame.

9. The communication terminal according to claim 1 , wherein

the association is formed according to a first protocol of the communication protocols,

a communication protocol of the selected frame is a second protocol of the communication protocols, and

the second protocol is different from the first protocol.

10. The communication terminal according to claim 9 , wherein

the first protocol is a communication protocol compliant with IEEE 802.11, and

the second protocol is one of TCP, IPSEC, Websocket, ICMP, IKE, GRE, L2TP, PPTP, UDP and DHCP.