Interference cancelation for 5G or other next generation network

• US 10,320,512 B2
• Filed: 01/08/2017
• Issued: 06/11/2019
• Est. Priority Date: 01/08/2017
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Nammi, SaiRamesh, Wang, Xiaoyi, Ghosh, Arunabha
• Primary Examiner(s): Nowlin, Eric
• Application Number:
  US15/401,083
• Publication Number:
  US 20180198548A1
• Time in Patent Office: 884 Days
• CPC Class Codes: H04J 11/004 using regenerative subtractive interference cancellation
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 27/2691 involving interference determination or cancellation
• CPC Class Codes: H04L 27/2695 with channel estimation, e.g. determination of delay spread, derivative or peak tracking channel estimation H04L25/0202

Abstract

An interference cancelation receiver can cancel channel state information reference signal interference using a single fast fourier transform (FFT), thereby reducing the complexity of the receiver. The transmitter can multiplex a channel state information reference signal (CSI-RS) with a physical downlink shared channel (PDSCH) of another numerology, thereby improving a resource utilization. Thus, significant gains in link and system throughputs can be achieved via the use of the interference cancelation receiver.

Claims

1. A method, comprising:

based on a first subcarrier spacing of a wireless network, analyzing, by a mobile device comprising a processor, signal interference data representative of a signal interference;

based on a first result of the analyzing, determining, by the mobile device, a cause of the signal interference;

in response to the determining, decoding, by the mobile device using a sampling rate, the signal interference data, and decoding channel state data associated with a channel state data reference signal, wherein the channel state data is further associated with a second subcarrier spacing of the mobile device;

based on the signal interference data and the channel state data, determining, by the mobile device, an estimated channel response frequency, wherein the determining the estimated channel response frequency comprises subtracting the second subcarrier spacing of the mobile device;

based on the signal interference, generating, by the mobile device, an equivalent signal interference generated to be equivalent to the signal interference, wherein the equivalent signal interference has been modified as a function of the estimated channel response frequency, resulting in an estimated cancelation signal;

based on the estimated cancelation signal, canceling, by the mobile device, a received signal from a network device of the wireless network; and

based on physical downlink shared channel data associated with the signal interference, receiving, by the mobile device via a radio resource control signal, a request to transmit the channel state data at aperiodic intervals.

2. The method of claim 1, further comprising:

determining, by the mobile device, that the first subcarrier spacing is not the second subcarrier spacing.

3. The method of claim 1, wherein the decoding comprises applying a fast fourier transform to the decoding of the signal interference data and the decoding of the channel state data based on the sampling rate.

4. The method of claim 1, further comprising:

converting, by the mobile device, the received signal from a serial format to a parallel format.

5. The method of claim 1, wherein the mobile device is preconfigured to analyze the signal interference data in response to receiving the signal interference data.

6. The method of claim 1, wherein the received signal encodes information associated with the physical downlink shared channel of the mobile device, and wherein a modifying comprises multiplying the equivalent signal interference by the estimated channel response frequency.

7. The method of claim 1, wherein the decoding of the signal interference is a first decoding, wherein the decoding of the channel state data is a second decoding and further comprising:

initiating, by the mobile device, a third decoding, and wherein the third decoding is not based on the cause of the signal interference.

8. A system, comprising:

a processor; and

a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising;

based on a first subcarrier spacing of a wireless network, analyzing signal interference data representative of a signal interference;

determining a cause of the signal interference;

in response to the determining the cause of the signal interference, determining an estimated channel response frequency, decoding the signal interference data using a sampling rate, and decoding channel state data, associated with a channel state data reference signal, associated with a second subcarrier spacing of the wireless network, wherein the determining the estimated channel response frequency comprises subtracting the second subcarrier spacing of the wireless network;

in response to a condition being determined to have been satisfied, generating an equivalent signal interference to the signal interference;

modifying the equivalent signal interference as a function of the estimated channel response frequency, resulting in an estimated cancelation signal;

based on the estimated cancelation signal, canceling a received signal from a network device of the wireless network; and

based on physical downlink shared channel data associated with the signal interference, receiving, via a radio resource control signal, a request to transmit the channel state data according to an aperiodic interval.

9. The system of claim 8, wherein the condition is associated with a failed cyclic redundancy check for the physical downlink shared channel data.

10. The system of claim 8, wherein the modifying comprises multiplying equivalent signal interference data associated with the equivalent signal interference with estimated channel response frequency data associated with the estimated channel response frequency.

11. The system of claim 8, wherein the signal interference data is first signal interference data, and wherein the operations further comprise:

receiving second signal interference data from the network device to facilitate signal interference cancelation.

12. The system of claim 11, wherein the receiving the second signal interference data is in response to determining a scheduling parameter for transmission to a mobile device.

13. The system of claim 8, wherein the analyzing the signal interference data is based on a configuration of a mobile device.

14. The system of claim 8, wherein the first subcarrier spacing is different from the second subcarrier spacing.

15. A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processor, facilitate performance of operations, comprising:

receiving first channel state data reference signals associated with first signal interference data;

in response to the receiving the first channel state data reference signals, facilitating canceling the first channel state data reference signals based on a condition associated with a mobile device;

based on a first subcarrier spacing of a wireless network, analyzing second signal interference data representative of a second channel state data reference signal, not of the first channel state data reference signals;

based on the analyzing, decoding the second signal interference data and decoding the channel state data to determine an estimated channel response frequency, wherein determination of the estimated channel response frequency comprises removing a second subcarrier spacing associated with the mobile device; and

based on a physical downlink shared channel associated with the second signal interference data, receiving, via a radio resource control signal, a request to transmit the channel state data at aperiodic intervals.

16. The non-transitory machine-readable storage medium of claim 15, wherein the second signal interference data is decoded at a first sampling rate and the channel state data is decoded at a second sampling rate.

17. The non-transitory machine-readable storage medium of claim 16, wherein the channel state data is associated with a channel state data reference signal.

18. The non-transitory machine-readable storage medium of claim 15, wherein operations further comprise:

generating third signal interference data to be equivalent to the estimated channel response frequency.

19. The non-transitory machine-readable storage medium of claim 18, wherein the operations further comprise:

multiplying the equivalent signal interference by the estimated channel response frequency, resulting in an estimated cancelation signal.

20. The non-transitory machine-readable storage medium of claim 19, wherein the operations further comprise:

based on the estimated cancelation signal, canceling a third channel state data reference signal from a network device of the wireless network.