Channel Quality Reporting for Full-Duplex Radio

• US 20170141886A1
• Filed: 11/13/2015
• Published: 05/18/2017
• Est. Priority Date: 11/13/2015
• Status: Active Grant

• Current Assignee: National Instruments Corporation (Emerson Electric Company)
• Original Assignee: National Instruments Corporation (Emerson Electric Company)
• Inventors: Chung, MinKeun, Kim, Jaeweon, McCoy, James W., Aziz, Ahsan
• Granted Patent: US 9,935,757 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Techniques are disclosed relating to channel quality reporting for full-duplex (FD) wireless communications. In some embodiments an apparatus (e.g., a mobile device) is configured to receive a reference signal in a wireless communication and determine an effective signal to interference plus noise ratio (SINR) for FD communications based on a measured SINR of the reference signal and one or more self-interference cancelation levels. The apparatus may determine the one or more self-interference cancelation levels based on the transmit power of signals transmitted by the apparatus and residual power after SIC. The SIC levels may include both analog and digital SIC levels, which may be separately determined. One or more modulation and coding schemes may be determined based on the effective SINR. In some embodiments, multiple effective SINRs are determined for multiple different transmission modulation orders used by the apparatus.

Claims

1. An apparatus, comprising:

one or more processing elements configured to;

receive a reference signal in a wireless communication; and

determine an effective signal to interference plus noise ratio (SINR) for full-duplex (FD) communications, based on the reference signal, wherein the effective SINR for FD communications is based on;

a measured SINR of the reference signal; and

one or more measured self-interference cancelation (SIC) levels.

2. The apparatus of claim 1, wherein the apparatus is configured to determine the measured SINR during a time interval in which the apparatus is configured to wirelessly transmit using time and frequency resources that at least partially overlap with time and frequency resources of the reference signal.

3. The apparatus of claim 1, wherein the one or more processing elements include:

analog SIC circuitry; and

one or more digital SIC processing elements;

wherein the one or more measured SIC levels include an analog SIC level corresponding to the analog SIC circuitry and a digital SIC level corresponding to the one or more digital SIC processing elements.

4. The apparatus of claim 3, wherein the apparatus is configured to determine the analog SIC level based on power of a wireless transmission by the apparatus and a measured residual power of the wireless transmission after analog self-interference cancelation.

5. The apparatus of claim 3, wherein the apparatus is configured to determine the digital SIC level based on error vector magnitude (EVM).

6. The apparatus of claim 1, wherein the apparatus is configured to transmit information that indicates the effective SINR and wherein the information is usable to determine one or more modulation and coding schemes for subsequent wireless communications with the apparatus.

7. The apparatus of claim 1, wherein the apparatus is configured to determine multiple effective SINRs based on determined SIC levels corresponding to multiple different modulation orders used for wireless transmission.

8. The apparatus of claim 7, wherein the multiple different modulation orders include two or more quadrature amplitude modulation (QAM) orders.

9. A method, comprising:

transmitting, by a computing device, a reference signal for full-duplex (FD) wireless communication;

receiving, by the computing device, one or more channel quality indicators in a wireless communication from a receiving computing device that received the reference signal, wherein the one or more channel quality indicators are determined based on both a measured SINR of the reference signal and one or more measured self-interference cancelation (SIC) levels for the receiving device; and

selecting, by the computing device, one or more modulation and coding schemes for subsequent FD wireless communications.

10. The method of claim 9, further comprising:

determining, by the computing device, one or more SIC levels of the computing device;

wherein the one or more modulation and coding schemes include a first modulation and coding scheme for transmissions from the receiving device and a second modulation and coding scheme for transmissions to the receiving device; and

wherein the selecting of the second modulation and coding scheme is based on the determined one or more SIC levels.

11. The method of claim 9,

wherein the selecting is performed based on overall spectral efficiency for FD wireless communications with the receiving device;

wherein the one or more modulation and coding schemes include a first modulation and coding scheme for transmissions from the receiving device and a second modulation and coding scheme for transmissions to the receiving device; and

wherein the first and second modulation and coding schemes are different modulation and coding schemes.

12. The method of claim 9,

wherein the one or more channel quality indicators include multiple channel quality indicators corresponding to different modulation orders for transmissions from the receiving device, the method further comprising:

selecting the one or more modulation and coding schemes based on the multiple channel quality indicators.

13. The method of claim 9, further comprising:

receiving information indicating a SIC classification for the receiving computing device; and

estimating one or more channel quality indicators for the receiving device based on the SIC classification and the one or more received channel quality indicators;

wherein the selecting is based on the estimated one or more channel quality indicators.

14. A non-transitory computer-readable medium having instructions stored thereon that are executable by a computing device to perform operations comprising:

receiving a reference signal in a wireless communication; and

determining an effective signal to interference plus noise ratio (SINR) for full-duplex (FD) communications, based on the reference signal, wherein the effective SINR for FD communications is based on;

a measured SINR of the reference signal; and

one or more measured self-interference cancelation (SIC) levels.

15. The non-transitory computer-readable medium of claim 14, wherein the one or more measured SIC levels include an analog SIC level and a digital SIC level.

16. The non-transitory computer-readable medium of claim 15, wherein the analog SIC level based on power of a wireless transmission by the computing device and a measured residual power of the wireless transmission after analog self-interference cancelation.

17. The non-transitory computer-readable medium of claim 15, wherein the operations further comprise determining the digital SIC level using an error vector magnitude (EVM) determination.

18. The non-transitory computer-readable medium of claim 14, wherein the operations further comprise transmitting information that indicates the effective SINR and wherein the information is usable to determine one or more modulation and coding schemes for subsequent wireless communications with the computing device.

19. The non-transitory computer-readable medium of claim 18, wherein the information that indicates the effective SINR is a channel quality indicator (CQI).

20. The non-transitory computer-readable medium of claim 14, wherein the operations further comprise determining multiple effective SINRs based on determined SIC levels corresponding to multiple different modulation orders used for wireless transmission.