Data communication method in non-beacon wireless network and non-beacon wireless network communication system

A non-beacon wireless network communication system comprising:

• a first end node for checking whether a coordinator uses a channel or not, transmitting a first control information message including its ID and a first data size to the coordinator after checking whether the channel is busy or not, receiving broadcast_ACK information of the coordinator for the first control information message, and transmitting first transmit_data to the coordinator or receive first receive_data from the coordinator after receiving the broadcast_ACK information;
• and
• the coordinator for receiving the first control information message from the first end node, broadcasting the broadcast_ACK information including the ID and a second data size, and receiving the first transmit_data from the first end node or transmitting the first receive_data to the first end node, wherein when the first end node transmits the first transmit_data, the first data size and the second data size are the size of the first transmit_data, and when the first end node requests the first receive_data, the first data size is 0 (zero) and the second data size is the size of the first receive_data.