METHODS FOR DETECTION OF FAILURE AND RECOVERY IN A RADIO LINK

• US 20130315358A1
• Filed: 07/30/2013
• Published: 11/28/2013
• Est. Priority Date: 08/08/2008
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Buckley, Eoin, Kuchibhotla, Ravi, Love, Robert T, Nory, Ravi, Krishnamurthy, Sandeep
• Granted Patent: US 9,451,567 B2
• Time in Patent Office: Days
• US Class Current: 375/357
• 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

1-20. -20. (canceled)

21. A method for a telecommunications apparatus to detect a status of a radio link, the method comprising:

receiving, by the telecommunications apparatus, a reference signal transmitted from a base station;

assuming, by the telecommunications apparatus, a transmission of a codeword of a first payload type from the base station; and

determining, by the telecommunications apparatus, a synchronization status based on the received reference signal and the assumed transmission of the codeword of the first payload type from the base station.

22. The method of claim 21 further comprising:

estimating a block error rate applicable to the assumed codeword of the first payload type based on the reference signal; and

determining the synchronization status from the estimated block error rate.

23. The method of claim 21 further comprising:

estimating, from the received reference signal, a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, and 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.

24. The method of claim 23 further comprising:

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

25. The method of claim 24 wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level, and power boost.

26. The method of claim 23 further comprising:

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

27. The method of claim 21 further comprising:

estimating, from the received reference signal, a metric of at least one of a block error rate, a mean mutual information per bit, average signal to noise ratio, and 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.

28. The method of claim 27 further comprising:

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

29. The method of claim 21 further comprising:

processing the received reference signal over a specified bandwidth.

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

31. The method of claim 22 further comprising:

estimating, from the received reference signal, 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.

32. The method of claim 25 wherein the payload corresponds to a physical downlink control channel format 1A.

33. The method of claim 22 further comprising:

estimating from the received reference signal 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.

34. The method of claim 28 wherein the payload parameter is at least one of a specific transmission format, sub-carrier mapping, transmit antenna configuration, aggregation level, and power boost.

35. The method of claim 34 wherein the payload corresponds to a physical downlink control channel format 1C.

36. The method of claim 25 wherein the specific transmission format is one of a downlink control information 1A and a downlink control information 1C.

37. The method of claim 22 wherein the block error rate applicable to the assumed codeword of the first payload type is assumed regardless of whether a codeword of the first payload type is actually transmitted by the base station.

38. The method of claim 22 wherein estimating the block error rate applicable to the assumed codeword of the first payload type based on the reference signal further comprises estimating the block error rate without decoding the assumed codeword.

39. The method of claim 21 wherein the first payload type is at least one of a control channel element size, a resource element group size, a size of subcarriers aggregated, a payload size, a subcarrier mapping, a power boost relative to the reference signal, a specific transmission format, a transmit antenna configuration, and a control region size.