COMMUNICATION SESSION ESTABLISHMENT

• US 20100328047A1
• Filed: 03/17/2008
• Published: 12/30/2010
• Est. Priority Date: 03/17/2008
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Varteva, Jaakko Valtteri, Jantunen, Joni Jorma
• Application Number:
  US12/867,698
• Publication Number:
  US 20100328047A1
• Time in Patent Office: Days
• US Class Current: 340/10.4
• CPC Class Codes: G06K 19/0707 the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation G06K19/0702 takes precedence
• CPC Class Codes: G06K 19/0712 the arrangement being capable of triggering distinct operating modes or functions dependent on the strength of an energy or interrogation field in the proximity of the record carrier active means for hindering electromagnetic reading or writing G06K19/07336
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10029 the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
• CPC Class Codes: G06K 7/10306 ultra wide band
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy

Abstract

A radio frequency identification system that has a radio frequency identification reader and a set of tags, in which the tags are interrogated in order to establish a connection with a responding tag. The responding tag determines a desired data rate and indicates this desired data rate to the reader during the interrogation so as to set the data rate for subsequent communication with the reader.

Claims

1. An apparatus comprising:

a transceiver configured to transmit first radio signals adapted to interrogate communication units, and to responsively receive second radio signals from a responding communication unit;

wherein the transceiver is further configured to determine based on the first and second radio signals a first data rate desired by the responding communication unit and to communicate with the responding communication unit using the first data rate; and

wherein the transceiver is further configured to determine the first data rate by testing different data rates and detecting associated responses.

3. An apparatus according to claim 1, wherein the testing involves transmitting data pulses during particular data frames and checking if responses are detected.

4. An apparatus according to claim 1, wherein the transceiver is configured to determine a predetermined response pattern as an indication of the first data rate.

5. An apparatus according to claim 4, wherein the transmitter is further configured to transmit predetermined pulses and the predetermined response pattern comprises selective responses to the predetermined pulses.

6. An apparatus according to claim 1, wherein the transceiver is configured to perform the determination of the data rate in connection with a second phase of interrogation in which a timing synchronization is being established between the apparatus and the responding communication unit.

7. An apparatus according to claim 1, wherein the first radio signals are adapted to interrogate radio frequency identification system communication units.

2. (canceled)

8. A method comprising:

transmitting first radio signals adapted to interrogate communication units, and responsively receiving second radio signals from a responding communication unit;

determining based on the first and second radio signals a first data rate desired by the responding communication unit;

communicating with the responding communication unit using the first data rate; and

determining the first data rate by testing different data rates and detecting associated responses.

10. A method according to claim 8, wherein the testing involves transmitting data pulses during particular data frames and checking if responses are detected.

11. A method according to claim 8, further comprising determining a predetermined response pattern as an indication of the first data rate.

12. A method according to claim 11, further comprising transmitting predetermined pulses;

wherein the predetermined response pattern comprises selective responses to the predetermined pulses.

13. A method according to claim 8, further comprising performing the determination of the data rate in connection with a second phase of interrogation in which a timing synchronization is being established between the apparatus and the responding communication unit.

14. A method according to claim 8, wherein the first radio signals are adapted to interrogate radio frequency identification system communication units.

15. A computer program product comprising a non-transitory computer-readable medium having computer-executable instructions stored thereon, which when executed by a processor causes an apparatus to perform the method according to claim 8.

9. (canceled)

16. A communication unit comprising:

a transceiver configured to receive interrogation signals from an interrogation source and to provide a response to the interrogation signals;

wherein the transceiver is configured to identify to the interrogation source a data rate that is desired by the communication unit on providing the response to the interrogation signals and to communicate with the interrogation source using the desired data rate;

wherein the transceiver is configured to successfully respond to the interrogation signals only when the interrogation signals have a data rate desired by the communication unit.

17. A communication unit according to claim 16, wherein the transceiver is configured to communicate with the interrogation source using a predetermined response pattern so as to identify the desired data rate.

19. A communication unit according to claim 16, wherein the transceiver is further configured to receive the second radio signals from the responding communication unit in a radio frequency identification system.

18. (canceled)

20. A method comprising:

receiving interrogation signals from an interrogation source;

responding to the interrogation signals;

identifying to the interrogation source a data rate that is desired by the communication unit on responding to the interrogation signals and communicating with the interrogation source using the desired data rate, and

successfully responding to the interrogation signals only when the interrogation signals have a data rate desired by the communication unit.

21. A method according to claim 20, further comprising communicating with the interrogation source using a predetermined response pattern so as to identify the desired data rate.

23. A method according to claim 20, further comprising receiving the second radio signals from the responding communication unit in a radio frequency identification system.

24. A computer program product comprising a non-transitory computer-readable medium having computer-executable instructions stored thereon, which when executed by a processor causes a communication unit to perforin the method according to claim 20.

22. (canceled)

25. (canceled)

26. An apparatus comprising:

means for transmitting first radio signals adapted to interrogate communication units, and for responsively receiving second radio signals from a responding communication unit;

means for determining based on the first and second radio signals a first data rate desired by the responding communication unit;

means for communicating with the responding communication unit using the first data rate; and

means for determining the first data rate by testing different data rates and detecting associated responses.

27. (canceled)