Multi-objects positioning system and power-control based multiple access control method
First Claim
1. 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.
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Abstract
The present invention provides a multi-objects positioning system and power-control based multiple access control method. The multi-objects positioning system according to the present invention comprises a plurality of tag devices carried by multiple objects and one or more positioning devices for determining the positions of the objects, wherein each of the tag devices includes a positioning device list for recording status information of the positioning devices. According to the present invention, tag device broadcasts Channel Request Packet (CRP) intermittently; positioning device, which is idle and receives the CRP, broadcasts Channel Allocation Packet (CAP) in its coverage range to allocate a channel to the tag device that is the sender of the CRP and inform information of the positioning device to other tag devices; tag device, which receives the CAP, updates its positioning device list according to the contents of the CAP; and the tag device adjusts transmission power of the CRP by referring to the positioning device list. With the present invention, the EN and HN problems existing in the prior arts can be solved effectively, and it is helpful to solve signal collision and improve spatio-temporal reuse capacity of the system.
12 Citations
18 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multi-objects positioning system capable of implementing power-control based multiple access control, which comprises a plurality of tag devices carried by the objects and a plurality of positioning devices for determining the positions of the objects, and wherein
the tag device comprises: -
a storage means for storing a positioning device list, which is used for recording status information of the positioning devices; a channel request means for broadcasting Channel Request Packet (CRP) intermittently; a positioning device list updating means for updating the positioning device list according to contents of Channel Allocation Packet (CAP) received from the positioning device; and a transmission power adjusting means for adjusting transmission power of the CRP by referring to the positioning device list, and the positioning device comprises; a status response means for receiving the CRP from the tag device, and when the positioning device is Idle, broadcasting the 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification