Patent ID: 7787493
Filing Date: 2010-08-31
Classification: H04B,H04W,Y02D

Abstract:
1. A radio communication method including, a first channel in which a first radio communication device and a second radio communication device which are Ultra Wide Band (UWB) radio communication devices perform data communication, and which is in a sleep mode at an initial stage, and also a second channel in which communication is always possible, and which has lower power consumption than the first channel, comprising: a step in which the first radio communication device transmits control information to the second radio communication device in the second channel, the control information including communication time reservation request information in which a time slot when data transmission will be performed is written; a step in which the second radio communication device receives the control information in the second channel and puts the first channel in a data reception operating mode; a step in which after transmitting and receiving of data are performed in the first channel between the first radio communication device and the second radio communication device, the reception in the first channel is returned to the sleep mode; a step in which if the communication time reservation request information included in the received control information is addressed to the second radio communication device, in the second channel it transmits communication time reservation response information in which information notifying that communication reservation addressed to the second radio communication device has been received is added to the communication time reservation request information; a step in which a third radio communication device located in an area where communication is possible with the first radio communication device or the second radio communication device or both receives in the second channel: a) the communication time reservation request information from the first radio communication device, and stores the time slot written in the communication time reservation request information as a transmission prohibition time slot, together with an identifier of the first radio communication device and an identifier of the second radio communication device in a communication prohibition table, and b) the communication time reservation response information from the second radio communication device, a step in which the third radio communication device decides a time slot in which its own transmission and reception are possible, based on the communication prohibition table, and wherein the first radio communication device transmits data using the second channel in the time slot designated by the communication time reservation request information.