Framed ALOHA for Multiple RFID Objects Identification

Abstract

Bin ZHEN †a) , Mamoru KOBAYASHI †b) , Nonmembers, and Masashi SHIMIZU †c) , Member SUMMARY Radio frequency identification (RFID) enables everyday objects to be identified, tracked, and recorded. The RFID tags are must be extremely simple and of low cost to be suitable for large scale application. An efficient RFID anti-collision mechanism must have low access latency and low power consumption. This paper investigates how to recognize multiple RFID tags within the reader's interrogation ranges without knowing the number of tags in advance by using framed ALOHA. To optimize power consumption and overall tag read time, a combinatory model was proposed to analyze both passive and active tags with consideration on capture effect over wireless fading channels. By using the model, the parameters on tag set estimation and frame size update were presented. Simulations were conducted to verify the analysis. In addition, we come up with a proposal to combat capture effect in deterministic anti-collision algorithms.

Energy-efficient active tag searching in large scale RFID systems

“…Generally, the existing RFID tag identification protocols can be classified into two categories [10,11]: ALOHA-based protocols [27][28][29][30] and tree-based protocols [19,31]. In ALOHA-based protocols, on average a tag needs to transmit its ID e times to the reader before being successfully identified [10,27], where e is the base of natural logarithm whose value is approximately equal to 2.72. The typical length of a tag ID is 96 bits [17,32].…”

Study on the Performance Improvement of Active RFID System

“…확도가 높은 것으로 평가되고 있다 [9] . S.R.Lee에 의해 서 제안된 EDFSA(Enhanced DFSA) [ Zhen [15] 의 알고리즘 또한 Schoute의 태그 추정함수를 사용하였고, 실험적인 방법을 통하여 도출시킨 최적프 레임 크기의 설정방법을 제안하였다. …”

Efficient Tag Identification in Mobile RFID Systems

“…The ALOHA protocol was first developed for random access in packet radio networks. To improve efficiency for RFID systems, the slotted ALOHA is developed [1] [2]. In [9], Schoute analyzes the performance of the dynamic frame-sized ALOHA.…”