2. Master or slave reader as power source.
This method is similar to 3.1 but the main difference is that the master-slave system acts only as RF energy source for wake-up and operation of the tags [8]. Otherwise the communication between MRFID reader and tags is as usual.
In cases 3.1 and 3.2 the master-slave and MRFID need to synchronize their communication [8]. So the MRFID reader sends only the first wake-up signal (step (6)). The master-slave reader continues with the second wake-up call to the tags synchronic to the first wake-up signal of the MRFID reader (step (7)). The tags send their ID information (step (8)). The MRFID consumes the information in listen mode.