Apparatus and method for reading multiple tags with different protocols in RFID system

• US 20070069862A1
• Filed: 09/22/2006
• Published: 03/29/2007
• Est. Priority Date: 09/23/2005
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Choi, Gil-Young, Chae, Jong-Suk, Lee, Dong-Han, Pyo, Cheol-Sig, Bae, Ji-Hoon, Mo, Hee-Sook, Quan, Cheng-Hao
• Application Number:
  US11/525,310
• Publication Number:
  US 20070069862A1
• Time in Patent Office: Days
• US Class Current: 340/10.200
• CPC Class Codes: H04L 67/60 Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources admission control or resource allocation H04L47/70
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols

Abstract

An apparatus and method for reading multiple tags with different protocols in a RFID system are provided. The method of reading multiple tags with different protocols in a RFID system including the steps of: a) setting scheduling parameters including target protocols to read, priorities of each protocol, and information about a scheduling algorithm mode for reading multiple tags; b) reading tags of a single protocol corresponding to the target protocol when the scheduling algorithm mode is a single mode; and c) reading multiple tags by the target protocols when the scheduling algorithm mode is a multi mode.

Claims

1. A method of reading multiple tags with different protocols in a RFID system, comprising the steps of:

a) setting scheduling parameters including target protocols to read, priorities of each protocol, and information about a scheduling algorithm mode for reading multiple tags;

b) reading tags of a single protocol corresponding to the target protocol when the scheduling algorithm mode is a single mode; and

c) reading multiple tags by the target protocols when the scheduling algorithm mode is a multi mode,

wherein the step c) includes the steps of;

c-1) setting a reading time per each protocol according to the priority and reading multiple tags according to the reading time; and

c-2) setting a reading time and a reading order by a protocol according to the priority, and reading multiple tags according to the reading time and the reading order.

2. The method as recited in claim 1, wherein the step c) further includes the step of:

setting a tag reading time and a reading order of each protocol according to the priority, and

canceling a remained reading time and reading tags of a next protocol if a tag of a corresponding protocol is not recognized for a query unit time of the corresponding protocol while reading multiple tags by protocols according to the reading time.

3. The method as recited in claim 1, wherein the step c) further includes the step of:

canceling a remained reading time and reading tags of a next protocol if a receiving signal level of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum receiving signal level while reading multiple tags by a protocol according to the reading time.

4. The method as recited in claim 1, wherein the step c) further includes the step of:

canceling a remained reading time and reading tags of a next protocol if a read rate of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum read rate while reading multiple tags by a protocol according to the reading time.

5. A method of reading multiple tags in a RFID system comprising the steps of:

a) setting scheduling parameters including target protocols to read, priorities of each protocol, and information about a scheduling algorithm mode for reading multiple tags;

b) reading tags of a single protocol corresponding to the target protocol when the scheduling algorithm mode is a single mode; and

c) setting a reading time by the target protocols according to the priority when the scheduling algorithm mode is a multi mode, and reading multiple tags by the target protocols according to the set reading time.

6. The method as recited in claim 5, wherein in the step c), a remained reading time is cancelled and tags of a next protocol are read if a tag of a corresponding protocol is not recognized for a query unit time of the corresponding protocol while reading multiple tags by protocols according to the reading time.

7. The method as recited in claim 5, wherein in the step c), a remained reading time is cancelled and tags of a next protocol are read if a receiving signal level of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum receiving signal level while reading multiple tags by a protocol according to the reading time.

8. The method as recited in claim 5, wherein in the step c), a remained reading time is cancelled and tags of a next protocol are read if a read rate of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum read rate while reading multiple tags by a protocol according to the reading time.

9. A method of reading multiple tags with different protocols in a RFID system, comprising the steps of:

a) setting priorities of protocols of multiple tags to read;

b) setting a reading time of each protocol according to the set priorities; and

c) reading multiple tags of each protocol according to the reading time.

10. The method as recited in claim 9, wherein the reading time is set to predetermined times of a query unit time of a corresponding protocol and the predetermined times is decided by the priority.

11. The method as recited in claim 10, wherein the reading time is set based on an equation:

For(i=0;

i<

nP;

i++){RCT[i]=Qt[i]*(nP−

Y[i]+1)}

wherein nP denotes the number of target protocols to read, RCT[i] denotes the reading time of a (i-1)^th type protocol, Qt[i] is the query unit time of a (i-1)th type protocol, and Y[i] denotes the priority of a (i-1)th type protocol.

12. The method as recited in claim 9, wherein in the step c), a remained reading time is cancelled and tags of a next protocol are read if a tag of a corresponding protocol is not recognized for a query unit time of the corresponding protocol while reading multiple tags by protocols according to the reading time.

13. The method as recited in claim 9, wherein in the step c), a remained reading time is cancelled and tags of a next protocol are read if a receiving signal level of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum receiving signal level while reading multiple tags by a protocol according to the reading time.

14. The method as recited in claim 9, wherein in the step c), a remained reading time is cancelled and tags of a next protocol are read if a read rate of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum read rate while reading multiple tags by a protocol according to the reading time.

15. A method of reading multiple tags with different protocols in a RFID system comprising the steps of:

a) setting priorities of protocols of multiple tags to read;

b) setting a reading time of each protocol according to the set priorities;

c) setting a reading order for each protocol according to the set priorities; and

d) reading multiple tags of each protocol according to the reading time.

16. The method as recited in claim 15, wherein the reading time is set to predetermined times of a query unit time of a corresponding protocol and the predetermined times is decided by the priority.

17. The method as recited in claim 15, wherein in the step d), a remained reading time is cancelled and tags of a next protocol are read if a tag of a corresponding protocol is not recognized for a query unit time of the corresponding protocol while reading multiple tags by protocols according to the reading time.

18. The method as recited in claim 15, wherein in the step d), a remained reading time is cancelled and tags of a next protocol are read if a receiving signal level of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum receiving signal level while reading multiple tags by a protocol according to the reading time.

19. The method as recited in claim 15, wherein in the step d), a remained reading time is cancelled and tags of a next protocol are read if a read rate of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum read rate while reading multiple tags by a protocol according to the reading time.

20. An apparatus for reading multiple tags with different protocols in a RFID system comprising:

a scheduling control unit for setting priorities of protocols of multiple tags to read and setting a reading time of each protocol according to the set priorities; and

a multi tag reading unit for reading multiple tags of each protocol according to the reading time.

21. The apparatus as recited in claim 20, wherein the reading time is set to predetermined times of a query unit time of a corresponding protocol and the predetermined times is decided by the priority.

22. The apparatus as recited in claim 20, wherein the reading time is set based on an equation:

For(i=0;

i<

nP;

i++){RCT[i]=Qt[i]*(nP−

Y[i]+1)}

wherein nP denotes the number of target protocols to read, RCT[i] denotes the reading time of a (i-1)^th type protocol, Qt[i] is the query unit time of a (i-1)th type protocol, and Y[i] denotes the priority of a (i-1)th type protocol.

23. The apparatus as recited in claim 20, wherein the multi tag reading unit cancels a remained reading time and reads tags of a next protocol if a tag of a corresponding protocol is not recognized for a query unit time of the corresponding protocol while reading multiple tags by protocols according to the reading time.

24. The apparatus as recited in claim 20, wherein the multi tag reading unit cancels a remained reading time and reads tags of a next protocol if a receiving signal level of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum receiving signal level while reading multiple tags by a protocol according to the reading time.

25. The apparatus as recited in claim 20, wherein the multi tag reading unit cancels a remained reading time and reads tags of a next protocol if a read rate of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum read rate while reading multiple tags by a protocol according to the reading time.

26. An apparatus for reading multiple tags with different protocols in a RFID system comprising:

a scheduling control unit for setting priorities of protocols of multiple tags to read and setting a reading time and a reading order of each protocol according to the set priorities; and

a multi tag reading unit for reading multiple tags of each protocol according to the reading time and the reading order.

27. The apparatus as recited in claim 26, wherein the multi tag reading unit cancels a remained reading time and reads tags of a next protocol if a tag of a corresponding protocol is not recognized for a query unit time of the corresponding protocol while reading multiple tags by protocols according to the reading time.

28. The apparatus as recited in claim 26, wherein the multi tag reading unit cancels a remained reading time and reads tags of a next protocol if a receiving signal level of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum receiving signal level while reading multiple tags by a protocol according to the reading time.

29. The apparatus as recited in claim 26, wherein the multi tag reading unit cancels a remained reading time and reads tags of a next protocol if a read rate of a corresponding protocol tag received for a query unit time of the corresponding protocol is smaller than a predetermined minimum read rate while reading multiple tags by a protocol according to the reading time.