METHODS FOR DETECTION OF FAILURE AND RECOVERY IN A RADIO LINK

• US 20100034092A1
• Filed: 08/08/2008
• Published: 02/11/2010
• Est. Priority Date: 08/08/2008
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: KRISHNAMURTHY, Sandeep, Nory, Ravi, Buckley, Michael E., Kuchibhotla, Ravi, Love, Robert
• Granted Patent: US 8,300,757 B2
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

A method, telecommunication apparatus, and electronic device for detecting a status of a radio link are disclosed. A transceiver 302 may maintain a radio link with a network base station 104. A processor 304 may map channel state information to a synchronization status associated with the radio link based on the received signal and determine the synchronization status via a block error rate estimate in the radio link based on the channel state information.

Claims

1. A method for detecting a status of a radio link, comprising:

receiving a downlink signal transmitted from a network base station;

monitoring a synchronization status associated with the radio link;

determining a channel state information from the downlink signal; and

determining the synchronization status from the channel state information based on the downlink signal.

2. The method of claim 1, further comprising:

determining the synchronization status via a block error rate estimate in the radio link based on the channel state information.

3. The method of claim 1, further comprising:

estimating from the channel state information a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a failure format; and

determining if the radio link has an out of synchronization event if the metric is within a failure range.

4. The method of claim 3, further comprising:

setting the failure range based upon at least one of payload parameter.

5. The method of claim 4, wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level or power boost.

6. The method of claim 3, further comprising:

determining the out of synchronization event for the radio link if a signal strength is below a synchronization check threshold.

7. The method of claim 1, further comprising:

estimating from the channel state information a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a recovery format; and

determining if the radio link has an in synchronization event if the metric is within a recovery range.

8. The method of claim 7, further comprising:

setting the recovery range based upon at least one payload parameter.

9. The method of claim 1, further comprising:

mapping the channel state information over a specified bandwidth.

21. The method of claim 1, wherein the downlink signal corresponds to a cell-specific reference signal.

22. The method of claim 1, further comprising:

estimating from the channel state information an average block error rate over an out of synchronization processing duration; and

determining if the radio link has an out of synchronization event if the average block error rate exceeds a failure threshold.

23. The method of claim 5, wherein the payload corresponds to a physical downlink control channel format 1A.

24. The method of claim 1, further comprising:

estimating from the channel state information an average block error rate over an in-synchronization processing duration; and

determining if the radio link has an in synchronization event if the average block error rate is below a recovery threshold.

25. The method of claim 8, wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level, or power boost.

26. The method of claim 25, wherein the payload corresponds to a physical downlink control channel format 1C.

10. A telecommunications apparatus for detecting a status of a radio link, comprising:

a transceiver that maintains a radio link with a network base station; and

a processor that maps a channel state information to a synchronization status associated with the radio link based on a received signal and determines the synchronization status via a block error rate estimate in the radio link based on the channel state information.

11. The telecommunications apparatus of claim 10 wherein the processor estimates from the channel state information a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a failure format and determines if the radio link has an out of synchronization event if the metric is within a failure range.

12. The telecommunications apparatus of claim 11, wherein the processor sets the failure range based upon at least one payload parameter.

13. The telecommunications apparatus of claim 11, wherein the processor determines the out of synchronization event for the radio link if a signal strength is below a synchronization check threshold.

14. The telecommunications apparatus of claim 10, wherein the processor estimates from the channel state information a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, or channel capacity using a recovery format and determines if the radio link has an in synchronization event if the metric is within a recovery range.

15. The telecommunications apparatus of claim 14, wherein the processor sets the recovery range based upon at least one payload parameter.

16. The telecommunications apparatus of claim 10, wherein the processor maps the channel state information over a specified bandwidth.

17. An electronic device for detecting a status of a radio link, comprising:

a transceiver that maintains a radio link with a network base station; and

a processor that maps channel state information for the radio link based on a received signal and determines a synchronization event of the radio link based on the channel state information.

18. The electronic device of claim 17, wherein the processor determines if the radio link has an in synchronization event using a recovery format.

19. The electronic device of claim 17, wherein the processor determines if the radio link has an out of synchronization event using a failure format.

20. The electronic device of claim 19, wherein the processor determines the out of synchronization event for the radio link if a signal strength is below a synchronization check threshold.