A METHOD FOR LINK SWITCHING USING PREDICTIVE POSITION OF LED-ID READER DEVICE IN LED-ID SYSTEM

摘要

PURPOSE: A link switching method in an LED(Light Emitting Diode)-ID(Identification) system based on a prediction position of an LED-ID reader is provided to execute a link switching procedure based on list information by calculating the list information of an LED-ID tag. CONSTITUTION: An LED-ID reader and a connected LED-ID tag generate list information of an LED-ID tag based on a prediction position. The LED-ID tag transmits a link switching response message including the list information to the LED-ID reader. The LED-ID reader receives the link switching response message. The LED-ID reader interrupts connection with the LED-ID tag. The LED-ID reader scans another LED-ID tag based on the list information. [Reference numerals] (AA) LED-ID reader; (B1) (a) step; (B2) Measuring the position of a user by the predetermined time interval and storing into user position information DB(DataBase); (C1) (b) step; (C2) Measuring the intensity of signals transmitted from LED-ID tags accessed to a user; (D1) (c) step; (D2) Comparing whether the result of the measurement is more than or equal to a reference value; (D3) Transmitting a link switching request message; (EE) No; (FF) Yes; (GG) LED-ID tags(LED-ID tags currently accessed to an LED-ID reader); (H1) (d) step; (H2) Receiving the link switching request message and calculating the estimated position of the LED-ID reader after the predetermined time; (I1) (e) step; (I2) Generating the list information of LED-ID tags which are accessible to the LED-ID reader; (J1) (f) step; (J2) Transmitting a link switching response message to the LED-ID reader; (K1) (g) step; (K2) Receiving the link switching response message and scanning LED-ID tags to be newly accessed based on the link switching response message