Communication apparatus and communication control method

A communication apparatus comprising:

• a communication unit which transmits and receives a radio wave;
• a first setting unit which determines, according to a first reference of received signal strength in a first communication apparatus which is either an external communication apparatus or the communication apparatus when in a predetermined communication state with the external communication apparatus through the communication unit, a transmitted signal strength for a transmission radio wave from a second communication apparatus which is the other one of the communication apparatus and the external communication apparatus, as a first reference of transmitted signal strength;
• a second setting unit which determines a second reference of transmitted signal strength between the first reference of transmitted signal strength and a maximum strength of transmitted signal strength from the second communication apparatus;
• and
• a setting updating unit which, when a predetermined condition is satisfied, outputs to the second communication apparatus a radio wave transmission instruction which requests the transmission radio wave to be transmitted at the second reference of transmitted signal strength, obtains a received signal strength at the first communication apparatus for the transmission radio wave at the second reference of transmitted signal strength transmitted from the second communication apparatus in response to the radio wave transmission instruction, and determines a transmitted signal strength of a transmission radio wave from the second communication apparatus according to the received signal strength.

A communication control method used in a communication apparatus including a communication unit which transmits and receives a radio wave, the method comprising:

• determining, according to a first reference of received signal strength in a first communication apparatus which is either an external communication apparatus or the communication apparatus when in a predetermined communication state with the external communication apparatus through the communication unit, a transmitted signal strength for a transmission radio wave from a second communication apparatus which is the other one of the communication apparatus and the external communication apparatus, as a first reference of transmitted signal strength;
• determining a second reference of transmitted signal strength between the first reference of transmitted signal strength and a maximum strength of transmitted signal strength from the second communication apparatus;
• and
• when a predetermined condition is satisfied, outputting to the second communication apparatus a radio wave transmission instruction which requests the transmission radio wave to be transmitted at the second reference of transmitted signal strength, obtaining a received signal strength at the first communication apparatus for the transmission radio wave at the second reference of transmitted signal strength transmitted from the other communication apparatus in response to the radio wave transmission instruction, and determining a transmitted signal strength of a transmission radio wave from the second communication apparatus according to the received signal strength.