METHOD AND APPARATUS FOR COMMUNICATION BETWEEN READERS HAVING DUAL SENSITIVITY MODES

• US 20090058613A1
• Filed: 03/31/2008
• Published: 03/05/2009
• Est. Priority Date: 08/29/2007
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: PYO, Cheol Sig, MO, Hee Sook, KIM, Nae-Soo, CHUNG, Byounghyun
• Application Number:
  US12/059,760
• Publication Number:
  US 20090058613A1
• Time in Patent Office: Days
• US Class Current: 340/10.200
• CPC Class Codes: H04Q 2209/47 using RFID associated with sensors
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

Provided is a method for communication with between readers having dual sensitivity modes for avoiding conflict between readers arising from interference each other when simultaneously used in a limited space. The method for communication between a tag and a reader using dual sensitivity modes for avoiding conflict between the reader and the tag includes: initializing the reader to a normal sensitivity mode; temporarily selecting a frequency channel by the reader; checking whether or not a different reader uses the selected frequency channel; repeatedly selecting another frequency channel if the other readers occupy the selected frequency channel; switching to a reduced sensitivity mode if the other readers do not occupy the selected frequency channel; and communicating with the tag by the reader in the reduced sensitivity mode.

Claims

1. A method for communication between a tag and a reader using dual sensitivity modes for avoiding conflict between the reader and the tag, comprising:

initializing the reader to a normal sensitivity mode;

temporarily selecting a frequency channel by the reader;

checking whether or not other readers occupy the selected frequency channel;

repeatedly selecting another frequency channel if the other readers occupy the selected frequency channel;

switching to a reduced sensitivity mode if the other readers do not occupy the selected frequency channel; and

communicating by the reader with the tag in the reduced sensitivity mode.

2. The method of claim 1, further comprising initializing the reader to the normal sensitivity mode when the communication between the reader and the tag is ended.

3. The method of claim 1, wherein the reader is a mobile or portable device.

4. The method of claim 1, wherein the reader operates irrespective of transmission synchronization or reception synchronization.

5. A reader apparatus having dual sensitivity modes for avoiding conflict among readers, comprising:

a frequency channel selector which allows the reader to temporarily select a frequency channel;

a channel scanner which checks whether or not other readers use the selected frequency channel;

a sensitivity mode controller which sets the reader to a normal sensitivity mode at an initial mode and switches to a reduced sensitivity mode as a result of the checking of the channel scanner if the other readers do not occupy the selected frequency channel; and

a communication unit which allows the reader to communicate with the tag in the reduced sensitivity mode.

6. The reader apparatus of claim 5, wherein the reader apparatus is a mobile or portable reader device.