Cooperative Routing and Transmission over Multi-hop Network of RFID Tags

As the theory that passive RFID tags placed closely can communicate with each other was verified, tag-to-tag communications and networking have become a popular topic. We need to achieve communication between long-distance tags at most time, so this paper studies a multi-hop tag-to-tag network based on turbo backscattering operation (TBO). End-to-end bit error rate is as the selection standard through the design of the data frame structure of reader and passive tags. The reader chooses the best transmission route and then brodcasts the routing information including tags' IDs. The tags on the selective path are then activated and uses cooperative network coding to transmit information. Moreover, mu code encoding algorithm is used to reduce the interferences between the reflected signals. According to the requirements of different application scenarios, we analyze and adjust our proposed routing. The simulation results show that proposed routing scheme reduces bit error rate (BER) and transmission delay, in addition, improves throughput and channel utilization.