Radio link performance prediction in wireless communication terminal

• US 8,976,774 B2
• Filed: 04/03/2013
• Issued: 03/10/2015
• Est. Priority Date: 11/07/2008
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Krishnamurthy, Sandeep H., Kuchibhotla, Ravi
• Primary Examiner(s): Faroul, Farah
• Application Number:
  US13/855,746
• Publication Number:
  US 20130215783A1
• Time in Patent Office: 706 Days
• Field of Search: 370/252, 370/342, 370/350
• US Class Current: 370/342
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

A method for predicting performance of a radio link in a wireless communication terminal including hypothesizing a second codeword including information associated with a hypothesized first codeword, obtaining channel state information from a received signal, and estimating a decoder error rate of the first codeword under a condition that the second codeword may not be decoded correctly, wherein the decoder error rate is estimated using the channel state information.

Claims

1. A method for predicting the performance of radio link in a wireless communication terminal, the method comprising:

hypothesizing a first codeword;

hypothesizing a second codeword including information associated with the first codeword;

obtaining channel state information from a received signal; and

estimating a decoder error rate of the first codeword under a condition that the second codeword may not be decoded correctly, the decoder error rate is estimated using the channel state information;

wherein the first codeword corresponds to a data payload and the second codeword corresponds to a control channel necessary for determining transmission parameters and scheduling information of the data payload.

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

3. The method of claim 1 further comprising determining a synchronization status of the radio link based upon the estimated decoder error rate of the first codeword.

4. The method of claim 1 further comprising generating channel quality indication reports based on the estimated decoder error rate for the first codeword.

5. The method of claim 1 further comprising

hypothesizing a third codeword including information associated with the second codeword;

estimating the decoder error rate of the first codeword under a condition that the second and third codewords may not be decoded correctly, the decoder error rate is estimated using a mapping function that includes channel state information.

6. The method of claim 5, wherein

the first codeword corresponds to a data payload and the second codeword corresponds to a control channel, wherein the information of the second codeword includes transmission parameters and scheduling information of the data payload;

and

the third codeword corresponds to a control format indicator channel wherein the information of the third codeword includes information related to a transmission parameters of the control channel.

7. The method of claim 5 further comprising generating channel quality indication reports based on the estimated decoder error rate for the first codeword.

8. The method of claim 5, wherein the information in the third code word is a transmission parameter corresponding to any one of:

a number of symbols on which the second codeword is mapped,

time-frequency resources on which the second codeword is mapped, or

an encoding method used for generating the second codeword, or

an information size of a payload of the second codeword, or

a block length of the second codeword, or

a rate of the second codeword, or

a redundancy version number of the first codeword, or a transmit antenna configuration used for the second codeword or

pre-coding used for the second codeword.

9. A wireless communication terminal comprising:

a transceiver;

a controller coupled to the transceiver, the controller configured to hypothesize a first codeword and to hypothesize a second codeword including information associated with the first codeword, the controller configured to obtain channel state information from a received signal, the controller configured to estimate a decoder error rate of the first codeword under a condition that the second codeword is not decoded correctly, the decoder error rate is estimated using a mapping function that includes channel state information;

wherein the first codeword corresponds to a data payload and the second codeword corresponds to a control channel necessary for determining transmission parameters and scheduling information of the data payload.

10. The terminal of claim 9, the controller configured to determine synchronization status of the radio link based upon the estimated decoder error rate of the first codeword.

11. The method of claim 9, the controller configured to generate channel quality indication reports based on the estimated decoder error rate for the first codeword.

12. The terminal of claim 9, the controller configured to hypothesize a third codeword including information associated with the second codeword and to estimate the decoder error rate of the first codeword under a condition that the second and third codewords are not decoded correctly.

13. The terminal of claim 12, wherein the first codeword corresponds to a data payload and the second codeword corresponds to a control channel, wherein the information of the second codeword includes transmission parameters and scheduling information of the data payload, and the third codeword corresponds to a control format indicator channel wherein the information of the third codeword includes information related to a transmission parameters of the control channel.

14. The terminal of claim 12, the controller configured to generate channel quality indication reports based on the estimated decoder error rate for the first codeword.

15. The terminal of claim 12, the information in the third code word is a transmission parameter corresponding to any one of:

a number of symbols on which the second codeword is mapped,

time-frequency resources on which the second codeword is mapped, or

an encoding method used for generating the second codeword, or

an information size of a payload of the second codeword, or

a block length of the second codeword, or

a rate of the second codeword, or

a redundancy version number of the first codeword, or

a transmit antenna configuration used for the second codeword or

pre-coding used for the second codeword.