Abstract
In a mobile radio-frequency identification (RFID) system, tagged items enter and leave the reader's field at a constant speed. The possibility of tags leaving the reader's interrogation zone without being identified is known as tag loss. Minimizing the tag loss ratio in the presence of random denial-of-service (DoS) attacking signals by optimizing the number of frames is investigated in this paper. The results show that the number of frame control is not needed to reduce the tag loss ratio if the tag entering rate is below a critical limit. The number of frames has to abruptly reduce to keep the tag loss ratio lower if the tag entering rate exceeds that critical limit. This critical limit of the tag entering rate is derived analytically. An analytical solution of the optimum number of frames in the presence of attacking signals that also minimize the tag loss ratio is devised. The technique for setting the optimum number of frames is also presented. The presented results in this paper with random DoS attacking signals is so general that those can be converted without DoS attacking signals by setting the DoS attacking signals equal to zero. The results of this paper can be used for mobile RFID system design with and without DoS attacking signals.
Note to Practitioners-The designers of a mobile RFID system where the moving tags pass the reader's interrogation region with constant speed have a challenging task for selecting the appropriate parameters. The parameters will be selected in such a way that the system will work most efficiently or the moving tags will be unidentified with minimum probability. The optimum number of frames plays an important role in the design of an efficient mobile RFID system and the computation of this parameter and the relationship with other related parameters have been presented in this paper. The efficiency of a mobile RFID system can be drastically reduced in the presence of random DoS attacking signals. We have presented the computation methods and results of the optimum number of frames in a mobile RFID system with and without the presence of random DoS attacking signals.