Adaptive generation of channel quality indicators (CQIs) based on a current communication scenario

• US 8,761,039 B2
• Filed: 09/04/2012
• Issued: 06/24/2014
• Est. Priority Date: 03/28/2012
• Status: Expired due to Fees

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Ji, Zhu, Damji, Navid, Sebeni, Johnson O.
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): Kirillova, Ellen A
• Application Number:
  US13/602,551
• Publication Number:
  US 20130258877A1
• Time in Patent Office: 658 Days
• Field of Search: 370/252
• US Class Current: 370/252
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04M 1/00 Substation equipment, e.g. for use by subscribers subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Adaptive generation of channel quality indicators based on a current communication scenario. A plurality of sets of channel quality indicator information may be stored for each of a plurality of UE communication scenarios. The information may be usable in generating a channel quality indicator. During operation of the UE, a current communication scenario of the UE may be determined. A first set of channel quality indicator information may be selected based on the determined current communication scenario being experienced by the UE. At least one channel quality indicator may be determined based on the selected first set of channel quality indicator information. Finally, the channel quality indicator may be provided to a base station.

Claims

1. A user equipment (UE) device, the UE device comprising:

an antenna for performing wireless communications with a base station;

a memory which stores a plurality of sets of communication scenario information for each of a plurality of UE communication scenarios, wherein each of the stored plurality of sets of communication scenario information is based on two or more of receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift, wherein each set of communication scenario information is useable in generating a channel quality indicator for a respective communication scenario;

a processor configured to;

determine a current communication scenario of the UE device during operation of the UE, wherein determining the current communication scenario is based on the two or more of receiver type, MIMO scheme, and amount of Doppler shift;

select a first set of communication scenario information from the plurality of sets of communication scenario information based on the determined current communication scenario of the UE device;

determine a current channel estimation for the UE device; and

generate at least one channel quality indicator based on the selected first set of communication scenario information and the current channel estimation, wherein the current channel estimation is used to generate the channel quality indicator for each of the plurality of UE communication scenarios;

wherein the UE device is configured to transmit the channel quality indicator to a base station.

2. The UE device of claim 1,

wherein each of the stored plurality of sets of communication scenario information is based on receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift;

wherein said determining the current communication scenario of the UE comprises determining a receiver type of the UE, a MIMO scheme used by the base station, and the amount of Doppler shift experienced by the UE.

3. The UE device of claim 1,

wherein each of the stored plurality of sets of communication scenario information comprises one or more mapping tables for mapping spectral efficiency to the channel quality indicator.

4. The UE device of claim 1,

wherein each of the stored plurality of sets of communication scenario information comprises at least:

1) a first mapping table for mapping signal to noise ratio to spectral efficiency and

     2) a second mapping table for mapping spectral efficiency to the channel quality indicator.

20. The UE device of claim 1, wherein the current communication scenario is based on the receiver type, wherein the receiver types comprise one or more of Linear Minimum Mean Square Error (LMMSE), Maximum Likelihood Method (MLM), or Linear Minimum Mean Square Error with Serial Interference Cancellation (LMMSE-SIC).

5. A method performed by wireless user equipment (UE), the method comprising:

determining a current communication scenario of the UE during operation of the UE, wherein determining the current communication scenario is based on two or more of receiver type, MIMO scheme, and amount of Doppler shift;

selecting a first set of communication scenario information based on the determined current communication scenario of the UE, wherein the first set of communication scenario information is selected from a stored plurality of sets of communication scenario information, wherein each of the stored plurality of sets of communication scenario information is based on the two or more of receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift, wherein each set of communication scenario information corresponds to a respective UE communication scenario;

determining a current channel estimation for the UE;

generating at least one channel quality indicator based on the selected first set of communication scenario information and based on the current channel estimation for the UE, wherein the current channel estimation is used to generate the channel quality indicator for each of the communication scenarios; and

transmitting the channel quality indicator to a base station.

6. The method of claim 5,

wherein each of the stored plurality of sets of communication scenario information is based on receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift;

wherein said determining the current communication scenario of the UE comprises determining a receiver type of the UE, a MIMO scheme used by the base station, and the amount of Doppler shift experienced by the UE.

7. The method of claim 5,

wherein each of the stored plurality of sets of communication scenario information comprises one or more mapping tables for mapping spectral efficiency to the channel quality indicator.

8. The method of claim 5,

wherein each of the stored plurality of sets of communication scenario information comprises at least:

1) a first mapping table for mapping signal to noise ratio to spectral efficiency and

     2) a second mapping table for mapping spectral efficiency to the channel quality indicator.

21. The method of claim 5, wherein the current communication scenario is based on the receiver type, wherein the receiver types comprise one or more of Linear Minimum Mean Square Error (LMMSE), Maximum Likelihood Method (MLM), or Linear Minimum Mean Square Error with Serial Interference Cancellation (LMMSE-SIC).

9. A method for operating wireless user equipment (UE), the method comprising:

storing a plurality of sets of communication scenario information for each of a plurality of UE communication scenarios, wherein each of the stored plurality of sets of communication scenario information is based on two or more of receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift, wherein each set of communication scenario information is useable in generating a channel quality indicator for a respective communication scenario;

determining a current communication scenario of the UE during operation of the UE, wherein determining the current communication scenario is based on the two or more of receiver type, MIMO scheme, and amount of Doppler shift;

selecting a first set of communication scenario information from the plurality of sets of communication scenario information based on the determined current communication scenario of the UE;

determining a current channel estimation for the UE device;

generating at least one channel quality indicator based on the selected first set of communication scenario information and the current channel estimation, wherein the current channel estimation is used to generate the channel quality indicator for each of the plurality of UE communication scenarios; and

providing the channel quality indicator to a base station.

10. The method of claim 9,

wherein each of the stored plurality of sets of communication scenario information is based on receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift;

wherein said determining the current communication scenario of the UE comprises determining a receiver type of the UE, a MIMO scheme used by the base station, and the amount of Doppler shift experienced by the UE.

11. The method of claim 9,

wherein each of the stored plurality of sets of communication scenario information comprises one or more mapping tables for mapping spectral efficiency to the channel quality indicator.

12. The method of claim 9,

wherein each of the stored plurality of sets of communication scenario information comprises at least:

1) a first mapping table for mapping signal to noise ratio to spectral efficiency and

     2) a second mapping table for mapping spectral efficiency to the channel quality indicator.

22. The method of claim 9, wherein the current communication scenario is based on the receiver type, wherein the receiver types comprise one or more of Linear Minimum Mean Square Error (LMMSE), Maximum Likelihood Method (MLM), or Linear Minimum Mean Square Error with Serial Interference Cancellation (LMMSE-SIC).

13. A non-transitory computer-accessible memory medium storing program instructions, wherein the program instructions, when executed by a computer system, cause the computer system to:

determine a current communication scenario of the UE during operation of the UE, wherein determining the current communication scenario is based on two or more of receiver type, MIMO scheme, and amount of Doppler shift;

select a first set of communication scenario information based on the determined current communication scenario of the UE, wherein the first set of communication scenario information is selected from a stored plurality of sets of communication scenario information, wherein each of the stored plurality of sets of communication scenario information is based on the two or more of receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift, wherein each set of communication scenario information corresponds to a respective UE communication scenario;

determine a current channel estimation for the UE; and

generate at least one channel quality indicator based on the selected first set of communication scenario information and based on the current channel estimation for the UE, wherein the current channel estimation is used to generate the channel quality indicator for each of communication scenarios;

wherein the channel quality indicator is configured to be transmitted to a base station.

14. The non-transitory computer-accessible memory medium of claim 13,

wherein each of the stored plurality of sets of communication scenario information is based on receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift.

15. The non-transitory computer-accessible memory medium of claim 13,

wherein each of the stored plurality of sets of communication scenario information comprises one or more mapping tables for mapping spectral efficiency to the channel quality indicator.

23. The non-transitory computer accessible memory medium of claim 13, wherein the current communication scenario is based on the receiver type, wherein the receiver types comprise one or more of Linear Minimum Mean Square Error (LMMSE), Maximum Likelihood Method (MLM), or Linear Minimum Mean Square Error with Serial Interference Cancellation (LMMSE-SIC).

16. A method for configuring wireless user equipment (UE), the method comprising:

performing a channel quality indicator adaptation method for each of a plurality of UE communication scenarios to determine a plurality of sets of communication scenario information, wherein each of the stored plurality of sets of communication scenario information is based on two or more of receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift, wherein each set of communication scenario information corresponds to one of the UE communication scenarios;

storing the plurality of sets of communication scenario information in the UE;

configuring the UE to selectively utilize ones of the plurality of sets of communication scenario information to generate a channel quality indicator based on current communication conditions of the UE and based on a current channel estimation for the UE, wherein the current channel estimation is used to generate the channel quality indicator for each of the plurality of UE communication scenarios.

17. The method of claim 16,

wherein said performing the channel quality indicator adaptation method for each of the plurality of UE communication scenarios comprises:

a) selecting a signal to noise ratio value;

b) defining a spectral efficiency value based on the signal to noise ratio;

c) determining a modulation and coding scheme based on the signal to noise ratio;

d) generating a channel quality indicator value based on the modulation and coding scheme and the selected signal to noise ratio value;

performing a)-d) a plurality of times to generate a mapping table which maps spectral efficiency values to channel quality indicator values, wherein the mapping table comprises the communication scenario information.

18. The method of claim 16, wherein each of the stored plurality of sets of communication scenario information is based on receiver type, multiple input-multiple output (MIMO) scheme, and amount of Doppler shift.

19. The method of claim 16,

wherein said configuring the UE comprises storing a software program in a memory of the UE which is executable by the processor.

24. The method of claim 16, wherein the communication scenarios are based on the receiver type, wherein the receiver types comprise one or more of Linear Minimum Mean Square Error (LMMSE), Maximum Likelihood Method (MLM), or Linear Minimum Mean Square Error with Serial Interference Cancellation (LMMSE-SIC).