Wireless communication system and wireless communication method

A wireless communication system performing wireless communication in carrier sense multiple access/collision avoidance system, the wireless communication system comprising:

• a plurality of remote controllers that corresponding to a plurality of control targets and transmitting control information for controlling each of the control targets through wireless communication, each of the remote controllers having a battery as power source;
• and
• an access point that receives and relays the control information to a control apparatus of the control target,
• wherein:
• the access point includes an access point side wireless communication control portion transmitting a beacon signal at a particular cycle and performing wireless communication with each of the remote controllers, the beacon signal having communication condition information;
• each of the remote controllers includes a remote controller side wireless communication control portion performing wireless communication with the access point in accordance with the communication condition information, which is included in the beacon signal received;
• the remote controller side wireless communication control portion performs a carrier sense for a predetermined carrier sense period after receiving the beacon signal;
• and
• when determining that transmission of the control information by one of the remote controllers is available by the carrier sense, the remote controller side wireless communication control portion transmits the control information, and the remote controller side wireless communication control portion shortens the carrier sense period for a next carrier sense in accordance with number of times of transmission of the control information.