การเพิ่มประสิทธิภาพของโปรโตคอลป้องกันการชนกันในระบบอาร์เอฟไอดี

Abstract

Radio Frequency identification (RFID) system is an automatic identification method. An RFID reader recognizes objects through wireless communications with tags having unique ID and information attached to the objects. The reader must be able to identify tags as quickly as possible. If only one tag responds, the reader will receive one response. But if there is more than one tag response, their responses will collide on the communication channel, and thus cannot properly be received by the reader. The problem is called Tag collision. This paper, we approach the problem of identifying a set of objects in the RFID system. We propose a modified version of EPC Class 1 Generation 2 using Slotted ALOHA Protocol to reduce the number of transmission collision. All tags select a slot to transmit their ID by generating a random number. If there is collision in the slot, the reader will broadcast the next identification request only to the tag which collided in that slot. Simulation results show our approach performs better than EPC Class1 Generation 2 in terms of identification time.