Channel selection method for reading tag information, tag selection apparatus of radio frequency identification (RFID) reader, and RFID reader
First Claim
1. A channel selection apparatus of a first radio frequency identification (RFID) reader within a wireless communication portable terminal, the channel selection apparatus comprising:
- a channel selection unit which selects a channel to read tag information stored in an RFID tag; and
a channel determination unit which determines whether the selected channel is used by a second RFID reader by measuring a number of reception times of a received signal for a certain unit time period with respect to the selected channel, and if the channel determination unit determines that the selected channel is not used by the second RFID reader, determines the selected channel to be a channel to read the tag information,wherein the channel determination unit compares the number of reception times measured for the certain unit time period with a first reference value, and determines that the selected channel is not used by the second RFID reader if the number of reception times measured for the certain unit time period equals the first reference value, and,wherein if the number of reception times measured for the certain unit time period does not equal the first reference value, the channel determination unit further compares the number of reception times measured for the certain unit time period with a second reference value to determine whether the selected channel is used by the second RFID reader.
1 Assignment
0 Petitions
Accused Products
Abstract
A channel selection method for reading tag information, a channel selection apparatus of an RFID reader applying the same, and an RFID reader. A channel selection apparatus of a radio frequency identification (RFID) reader equipped within a wireless communication portable terminal, includes a channel selection unit which selects a channel to read tag information stored in an RFID tag, and a channel determination unit which, when determining that the selected channel is not used by another RFID reader, determines the selected channel to be a channel to read the tag information. Accordingly, when a plurality of RFID readers reads out the tag information from the RFID tag almost at the same time, the interference among them can be avoided.
-
Citations
42 Claims
-
1. A channel selection apparatus of a first radio frequency identification (RFID) reader within a wireless communication portable terminal, the channel selection apparatus comprising:
-
a channel selection unit which selects a channel to read tag information stored in an RFID tag; and a channel determination unit which determines whether the selected channel is used by a second RFID reader by measuring a number of reception times of a received signal for a certain unit time period with respect to the selected channel, and if the channel determination unit determines that the selected channel is not used by the second RFID reader, determines the selected channel to be a channel to read the tag information, wherein the channel determination unit compares the number of reception times measured for the certain unit time period with a first reference value, and determines that the selected channel is not used by the second RFID reader if the number of reception times measured for the certain unit time period equals the first reference value, and, wherein if the number of reception times measured for the certain unit time period does not equal the first reference value, the channel determination unit further compares the number of reception times measured for the certain unit time period with a second reference value to determine whether the selected channel is used by the second RFID reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A channel selection method of a radio frequency identification (RFID) reader within a wireless communication portable terminal, the channel selection method comprising:
-
selecting a channel to read tag information stored in an RFID tag; determining whether the selected channel is used by a second RFID reader by measuring a number of reception times of a received signal for a certain unit time period with respect to the selected channel; and when it is determined that the selected channel is not used by the second RFID reader, determining the selected channel to be a channel to read the tag information, wherein the determining whether the selected channel is used by the second RFID reader comprises comparing the number of reception times measured for the certain unit time period with a first reference value, and determining that the selected channel is not used by the second RFID reader if the number of reception times measured for the certain unit time period equals the first reference value, and, wherein if the number of reception times measured for the certain unit time period does not equal the first reference value, the determining further comprises comparing the number of reception times measured for the certain unit time period with a second reference value to determine whether the selected channel is used by the second RFID reader. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
-
-
41. A channel selection apparatus of a first RFID reader within a wireless communication portable terminal, wherein the channel selection apparatus selects a channel to read tag information of an RFID tag which resides outside, based on channel request times measured by using time information provided from the wireless communication portable terminal, and determines whether the selected channel is used by a second RFID reader by measuring a number of reception times of a received signal for a certain unit time period with respect to the selected channel, and when it is determined that the selected channel is not used by the second RFID reader, determines the selected channel to be a channel to read the tag information,
wherein the channel selection apparatus compares the number of reception times measured for the certain unit time period with a first reference value, and determines that the selected channel is not used by the second RFID reader if the number of reception times measured for the certain unit time period equals the first reference value, and, wherein if the number of reception times measured for the certain unit time period does not equal the first reference value, the channel selection apparatus further compares the number of reception times measured for the certain unit time period with a second reference value to determine whether the selected channel is used by the second RFID reader.
-
42. An RFID reader comprising:
-
a channel selection unit which selects a channel to read tag information of an RFID tag; and a channel determination unit which determines whether the selected channel is used by another RFID reader by measuring a number of reception times of a received signal for a certain unit time period with respect to the selected channel and, when it is determined that the selected channel is not used by the another RFID reader, determines the selected channel to be a channel to read the tag information, wherein the channel determination unit compares the number of reception times measured for the certain unit time period with a first reference value, and determines that the selected channel is not used by the another RFID reader if the number of reception times measured for the certain unit time period equals the first reference value, and, wherein if the number of reception times measured for the certain unit time period does not equal the first reference value, the channel determination unit further compares the number of reception times measured for the certain unit time period with a second reference value to determine whether the selected channel is used by the another RFID reader.
-
Specification