High-Throughput and High-Efficiency Multiple Access Scheme for IEEE802.15.4 Based RFID Sensing

This paper presents a Multi-Frequency Time Division Multiple Access (MF-TDMA) scheme for long-packet and energy-constraint Radio Frequency Identification (RFID) sensing applications. The scheme takes advantages of both multiple transmission channels and scheduled time slots for high throughput and low latency. In addition, a dedicated channel is allocated to provide synchronization and coordination of the entire sensor tags to maximize the efficiency by re-using the scheduled slots. Meanwhile, an adaptive synchronization cycle is applied on each tag to minimize the probability of packets collision due to clock skew between sensor tags. Moreover, slots and channels reset mechanism is also suggested to cope with interference caused by other co-exist networks such as Wi-Fi. The performance analysis of the proposed MF-TDMA scheme shows that by employing 3 transmission channels it can achieve up to 3.3 times throughput compared to single channel TDMA. An optimal point of 90% packets delivery ratio can be obtained under the same experimental condition.