| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multiple access control method capable of effectively solving existing EN (Exposed Node) and HN (Hidden Node) problems, solving signal collision, and improving spatio-temporal reuse capacity of a system. <P>SOLUTION: A multi-objects positioning system includes a plurality of tag devices mounted on objects and one or more positioning devices for determining the positions of the objects. Each tag device includes a positioning device list for recording status information of the positioning devices. The tag device transmits a Channel Request Packet (CRP) intermittently, and a positioning device, which is idle and receives the CRP, allocates a channel to the tag device that is the sender of the CRP received by the positioning device into an effective range, and transmits Channel Allocation Packet (CAP) for informing other tag devices of information of the positioning device, and the tag device, which receives the CAP, updates its positioning device list stored according to the content of the CAP, and the tag device adjusts transmission power of the CRP by referring to the positioning device list. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
