Radio Link Performance Prediction in Wireless Communication Terminal

• US 20100118856A1
• Filed: 10/26/2009
• Published: 05/13/2010
• Est. Priority Date: 11/07/2008
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kuchibhotla, Ravi, Krishnamurthy, Sandeep H.
• Granted Patent: US 8,457,112 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

A wireless communication terminal including a controller coupled to a transceiver wherein the controller is configured to determine a synchronization based on a mapping of channel state information to decoder error rate corresponding to a hypothetical control code word, to attempt to decode a control codeword in a received signal, and to conclude that an out of synchronization event has not occurred if the control codeword is decoded successfully regardless of an indication of the mapping.

Claims

1. A wireless communication terminal comprising:

a transceiver;

a controller coupled to the transceiver,

the controller configured to determine a synchronization based on a mapping of channel state information to decoder error rate corresponding to a hypothetical control code word,

the controller configured to attempt to decode a control codeword in a received signal,

the controller configured to conclude that an out of synchronization event has not occurred if the control codeword is decoded successfully regardless of an indication of the mapping.

2. The terminal of claim 1, the controller configured to conclude that an in synchronization event has occurred if the control codeword is decoded successfully regardless of an indication of the mapping.

3. The method of claim 1, the controller configured to conclude that an in synchronization event has not occurred if at least one control codeword addressed to the terminal was decoded unsuccessfully.

7. The terminal of claim 3, the first mode of operation is a first discontinuous reception mode and the second mode is a second discontinuous reception mode, a periodicity of the first discontinuous reception mode is different than a periodicity of the second discontinuous reception mode.

8. The terminal of claim 7, the controller configured to use the first filter output for determining radio link synchronization from a start of the transition to the second discontinuous reception mode until a time equal to a second evaluation interval of the second filter has elapsed.

4. A wireless communication terminal comprising:

a transceiver;

a controller coupled to the transceiver,

the controller configured to estimate a block error rate for a hypothetical control codeword,

the controller configured to determine radio link synchronization when the terminal is in a first mode of operation using a first filter output based on the estimated block error rate,

the controller configured to determine radio link synchronization when the terminal is in a second mode of operation using a second filter output based on the estimated block error rate.

upon transitioning from the first mode of operation to the second mode of operation, the controller configured to use the second filter output for determining radio link synchronization while operating in the second mode of operation from a time equal to a second evaluation interval of the second filter has elapsed after the start of the transition to the second mode.

5. The terminal of claim 4, the first mode of operation is discontinuous reception mode and the second mode of operation is non-discontinuous reception mode.

6. The terminal of claim 5, the controller configured to use the first filter output for determining radio link synchronization from a start of the transition to the non-discontinuous reception mode until a time equal to a second evaluation interval of the second filter has elapsed.

9. The method of claim 4, the first mode of operation is a first discontinuous reception mode and the second mode of operation is a second discontinuous reception mode, a periodicity of the first discontinuous reception mode is different than a periodicity of the second discontinuous reception mode.

10. The method of claim 9, using the first filter output for determining radio link synchronization from a start of transition to the second discontinuous reception mode until a time equal to a second evaluation interval of the second filter has elapsed.

11. A method in a wireless communication terminal, the method comprising:

estimating a block error rate for a hypothetical control codeword;

determining radio link synchronization when the terminal is in a first mode of operation using a first filter output based on the estimated block error rate;

determining radio link synchronization when the terminal is in a second mode of operation using a second filter output based on the estimated block error rate;

transitioning from the first mode of operation to the second mode of operation; and

using the second filter output for determining radio link synchronization while operating in the second mode of operation from a time equal to a second evaluation interval of the second filter has elapsed after the start of the transition to the second mode.

12. The method of claim 11, the first mode of operation is discontinuous reception mode and the second mode of operation is non-discontinuous reception mode.

13. The method of claim 12, using the first filter output for determining radio link synchronization from a start of transition to the non-discontinuous reception mode until a time equal to a second evaluation interval of the second filter has elapsed.