Interference cancelation for 5G or other next generation network

• US 10,742,343 B2
• Filed: 04/26/2019
• Issued: 08/11/2020
• 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:
  US16/395,812
• Publication Number:
  US 20190253171A1
• Time in Patent Office: 473 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 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:

determining, by a mobile device comprising a processor, a cause of a signal interference experienced by the mobile device based on a first subcarrier spacing of a wireless network;

in response to the determining, decoding, by the mobile device, signal interference data representative of the signal interference, 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 a frequency response associated with the second subcarrier spacing of the mobile device;

based on the signal interference, generating, by the mobile device, an equivalent 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, a request to transmit the channel state data at aperiodic intervals.

2. The method of claim 1, further comprising:

based on the first subcarrier spacing, analyzing, by the mobile device, the signal interference data representative of the signal interference.

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 a 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.

6. The method of claim 1, wherein the decoding comprises the decoding of the channel state data based on a sampling rate.

7. The method of claim 1, further comprising:

determining, by the mobile device, that the first subcarrier spacing is different than the second subcarrier spacing.

8. A system, comprising:

a processor; and

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

determining a cause of a signal interference associated with a first subcarrier spacing of a wireless network;

in response to the determining the cause of the signal interference, determining an estimated channel response frequency, decoding signal interference data representative of the signal interference, 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 a frequency response associated with 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 8, wherein the operations further comprise:

based on the first subcarrier spacing of the wireless network, analyzing the signal interference data representative of the signal interference.

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

in response to determining a scheduling parameter for transmission to a mobile device, receiving second signal interference data.

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

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

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

based on analyzing second signal interference data representative of a second channel state data reference signal, decoding the second signal interference data and decoding the first channel state data to determine an estimated channel response frequency, wherein determination of the estimated channel response frequency comprises removal of a frequency response associated with 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 second channel state data at aperiodic intervals.

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

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

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

analyzing the second signal interference data representative of the second channel state data reference signal, different than the first channel state data reference signals.

20. The non-transitory machine-readable medium of claim 19, wherein the analyzing the second signal interference data is based on a configuration of the mobile device.