In RFID system there is a single communication channel, and messages are exchanged between reader and tags, which are not able to communicate with each other.
在RFID系统中只有一个通信频道，数据能够在读写器与标签之间传送但不能在标签与标签之间传送。
2
In RFID system with several e-tags and one reader, tags often transfer data to reader at the same time, leading to channel collision, so reader is not able to read the information stored intags.