Compression of radio signals with adaptive mapping

Patent metadata

Field	Value
Publication number	US-10637540-B2
Application number	US-201815876842-A
Country	US
Kind code	B2
Filing date	Jan 22, 2018
Priority date	Jan 22, 2018
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

The described technology is generally directed towards selecting a compression and/or quantization function for communicating data to and from an analog front end of a radio unit of a base station coupled to a digital baseband processor of a central unit of the base station. The compression function and/or quantization function can be adaptively and/or otherwise selected based on various criteria, such as the amount of data being transmitted, whether the data corresponds to reference signals or other data, the network architecture (e.g., digital beamforming or hybrid beamforming) in use, and so on.

First claim

What is claimed is:

1. A method, comprising:
transmitting, by a transmitter of a cellular base station device comprising an analog front end of a radio device coupled to a digital baseband processor of a central device, radio signal data to a receiver via a link, wherein operations associated with the transmitting comprise:
selecting, by the transmitter, a compression mapping function for compression of the radio signal data, wherein the selecting comprises:
selecting a first compression mapping function as the compression mapping function in response to the transmitting employing hybrid beamforming, and
selecting a second compression mapping function as the compression mapping function in response to the transmitting employing digital beamforming, wherein the first compression mapping function is different from the second compression mapping function;

compressing, by the transmitter, the radio signal data using the compression mapping function that is based on a parameter vector, resulting in compressed data;
quantizing, by the transmitter, the compressed data based on a quantization parameter;
transmitting, by the transmitter, the parameter vector to the receiver; and
transmitting, by the transmitter, the compressed data to the receiver.

2. The method of claim 1 , wherein the radio device operates as the transmitter of the cellular base station device, wherein the compressed data corresponds to uplink data, and wherein the method further comprises determining, by the radio device, the parameter vector based on an estimated amount of the uplink data.

3. The method of claim 1 , wherein the operations associated with the transmitting further comprise transmitting, by the transmitter, the quantization parameter to the receiver.

4. The method of claim 3 , wherein the radio device operates as the transmitter of the cellular base station device, wherein the compressed data corresponds to uplink data, and wherein the method further comprises determining, by the radio device, the quantization parameter based on an estimated amount of the uplink data.

5. The method of claim 3 , wherein the central device operates as the transmitter of the cellular base station device, wherein the compressed data corresponds to downlink data, and wherein the method further comprises determining, by the central device, the parameter vector based on information received from a scheduler.

6. The method of claim 3 , wherein the central device operates as the transmitter of the cellular base station device, wherein the compressed data corresponds to downlink data, and wherein the method further comprises determining, by the central device, the quantization parameter based on an estimated amount of the downlink data.

7. The method of claim 1 , wherein the transmitting the compressed data to the receiver comprises transmitting the compressed data via a serial link or an IP network.

8. The method of claim 1 , further comprising estimating a channel between the cellular base station device and a user equipment using reference signals originating from the central device.

9. The method of claim 8 , wherein the operations associated with the transmitting further comprise compressing, by the transmitter, the reference signals with a third compression mapping function having a higher resolution than respective resolutions of the first compression mapping function and the second compression mapping function.

10. The method of claim 8 , wherein the operations associated with the transmitting further comprise compressing, by the transmitter, a demodulation reference signal of the reference signals with a third compression mapping function that is different than the first compression mapping function and the second compression mapping function.

11. The method of claim 1 , further comprising selecting, by the transmitter, a number of bits for the compressing based on a network architecture determined to be applicable to the cellular base station device.

12. A radio network device, comprising:
a processor; and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, the operations comprising:
compressing radio signal data with a compression mapping function that is based on a parameter vector, into compressed data, wherein the compressing comprises:
selecting a first compression mapping function as the compression mapping function in response to determining that hybrid beamforming is to be employed for a transmission of the compressed data, and
selecting a second compression mapping function as the compression mapping function in response to determining that digital beamforming is to be employed for the transmission of the compressed data, wherein the first compression mapping function is different from the second compression mapping function;

quantizing the compressed data based on a quantization parameter; and
transmitting the compressed data from a transmitter associated with the radio network device to a receiver associated with the radio network device.

13. The radio network device of claim 12 , wherein the operations further comprise transmitting the parameter vector and quantization parameter to the receiver.

14. The radio network device of claim 13 , wherein the operations further comprise receiving the parameter vector and quantization parameter at the receiver, and decompressing the compressed data by the receiver.

15. The radio network device of claim 12 , wherein the transmitter comprises a central device, and wherein operations further comprise estimating a channel between a user equipment and the radio network device based on reference signals sent from the transmitter to the receiver.

16. The radio network device of claim 15 , wherein the operations further comprise, compressing the reference signals sent from the transmitter to the receiver.

17. The radio network device of claim 15 , wherein the operations further comprise, compressing the reference signals sent from the transmitter to the receiver, comprising using a first reference signal compression function for demodulation reference signals and a second reference signal compression function for other reference signals other than the demodulation reference signals.

18. A machine-readable storage medium, comprising executable instructions that, when executed by a processor of a radio unit of a base station device, facilitate performance of operations, the operations comprising:
compressing radio signal data using a compression mapping function that is based on a parameter vector, resulting in compressed data, wherein the compressing comprises:
selecting a first compression mapping function as the compression mapping function in response to determining that hybrid beamforming will be employed for a transmission of the compressed data, and
selecting a second compression mapping function as the compression mapping function in response to determining that digital beamforming will be employed for the transmission of the compressed data, wherein the first compression mapping function is different from the second compression mapping function;

quantizing the compressed data based on a quantization parameter;
transmitting the parameter vector and the quantization parameter to a central unit of the base station device via a link; and
transmitting the compressed data to the central unit via the link.

19. The machine-readable storage medium of claim 18 , wherein the operations further comprise, decompressing compressed reference signals into

Assignees

• At & T Ip I Lp

Inventors

• Chopra Aditya
• Ghosh Arunabha
• Majmundar Milap
• Nammi Sairamesh

Classifications

• H04B7/0617

  for beam forming · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title

• H03M7/302

  characterised by the number of quantisers and their type and resolution · CPC title