Systems and methods for secure supply chain management and inventory control
View Patent ↗Systems for encoding and reading RFID tags on a collection of items are shown. One embodiment of the invention includes a plurality of items, where each item possesses an item identifier string, and a plurality of RFID tags, where an RFID tag is affixed to each of the items and each RFID tag is encoded with a code word element generated using at least all of the item identifier strings. In many embodiments, the collection is a plurality of goods contained within a case, pallet, container or storage area.
1. A method of reconstructing item identifier strings that identify items in a collection using information read from RFID tags affixed to the items, the method comprising:
receiving, using a processor, a plurality of data packets read from a batch of RFID tags, where each data packet includes redundancy provided by a coding scheme, where information for each RFID tag in the batch is shared among the RFID tags in the batch in the form of redundancy provided by the coding scheme, and where a code correction capability of the data packets enables the information of all of the RFID tags in the batch of RFID tags to be reconstructed by reading the data packets of a subset of the batch of RFID tags;
reordering the received plurality of data packets using an item sequence number extracted from each of the received plurality of data packets using the processor;
generating a code word from a set of code word elements comprising a code word element extracted from each of the received plurality of data packets using the processor; and
extracting a plurality of item identifier strings from the code word using the processor, where the plurality of item identifier strings identify items in the collection.
2. The method of claim 1 further comprising matching at least one item identifier string to an RFID tag by matching an item sequence number within the at least one item identifier string with an item sequence number extracted from a data packet read from the RFID tag in the batch of RFID tags.
3. The method of claim 1 further comprising eliminating data packets of the received plurality of data packets having an incorrect collection serial number portion of the data packet.
4. The method of claim 1 wherein generating a code word from a code word element portion of each of the received plurality of data packets using the processor comprises identifying at least one missing code word element.
5. The method of claim 4 wherein generating a code word from a code word element portion of each of the received plurality of data packets using the processor further comprises recovering at least one missing code word element using error correction code from at least one read data packet.
6. The method of claim 1 wherein extracting a plurality of item identifier strings from the code word using the processor comprises decrypting the code word.
7. The method of claim 1 wherein extracting a plurality of item identifier strings from the code word using the processor comprises deinterleaving the code word.
8. The method of claim 1 further comprising extracting manifest information from the code word.
9. The method of claim 8 wherein the manifest information comprises the time and location of construction of a pallet of the items and intended destination of the pallet.
10. The method of claim 1 , wherein the coding scheme is a block coding scheme.
11. The method of claim 10 , wherein the block coding scheme is a BCH coding scheme.
12. The method of claim 10 , wherein the block coding scheme is an RS coding scheme.
13. The method of claim 1 , wherein the coding scheme is an LDPC coding scheme.