Patent ID: 8374193

Claim:
A communication method for performing a communication among a plurality of communication devices sharing a communication band, comprising: a first step of transmitting notification signal during a first period to notify information for arbitrating the communication device capable of performing data transmission during a second period subsequent to the first period; and a second step of transmitting data from the communication device, capable of performing the data transmission during the second period based on the notification signal transmitted during the first period, in specific period in the second period allocated to the data transmitted from the communication device, wherein priority groups indicating the priority of the data or the communication device is used for categorizing the communication device capable of performing the data transmission during the second period; wherein slots for dividing the second period are used as the specific period in the second period, and the slots are allocated to the data or the communication device for each of the priority groups, slot IDs being applied to the slots respectively; and wherein the communication device, capable of performing the data transmission during the second period in the second step, transmit the data in the second period or at the period of the slot IDs allocated to the data of the communication device itself when another signal already transmitted is not detected during the second period.