Patent ID: 8548490

Claim:
A power-control based multiple access control method for a multi-objects positioning system, which comprises a plurality of tag devices carried by the objects and one or more positioning devices for determining the positions of the objects, wherein each of the tag devices includes a storage unit for storing a positioning device list, which is used for recording status information of the positioning devices, the method comprising: tag device broadcasting Channel Request Packet (CRP) intermittently; positioning device, which is idle and receives the CRP, broadcasting Channel Allocation Packet (CAP) in the range of coverage, wherein the CAP is used for allocating a channel to the tag device that is the sender of the CRP received by the positioning device and informing information of the positioning device to other tag devices; tag device, which receives the CAP, updating the positioning device list stored therein according to the contents of the CAP; and tag device adjusting transmission power of the CRP by referring to the positioning device list.