System and method for spatial on sub-band massive MIMO/BFN to provide a large number of orthogonal channels

Patent metadata

Field	Value
Publication number	US-9780856-B2
Application number	US-201514804936-A
Country	US
Kind code	B2
Filing date	Jul 21, 2015
Priority date	Jan 16, 2015
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Systems, methods, and computer-readable storage devices relate to a process for beamforming in a system. An available spectrum is divided into M sub-bands, with each of the M sub-bands having N beams. The system, through using M×N available beams, can maintain frequency domain and spatial domain orthogonality. A method includes receiving a direction indicating a location of a device relative to a transmitter and selecting a beam from the M×N beams. The beam can be a data beam for transmitting data to the device or a null to suppress interference. The bandwidth, spectrum and/or direction associated with the beam can be chosen and/or varied based on one of any number of parameters such as avoiding channel distortions, reducing mismatch in amplitude and/or delay, and adapting to a data type or data amount. Frequency assignments can be staggered through a cell-based region to reduce cell interference in assigning beams.

First claim

I claim:

1. A method comprising:
receiving data, to be transmitted from a first device to a second device, and a parameter;
receiving a direction indicating a location of the second device relative to the first device;
based on the parameter and the direction, receiving a selection of a frequency sub-unit chosen from a plurality of frequency sub-units covering an available frequency spectrum, to yield a selected frequency sub-unit, wherein a set of frequencies within the selected frequency sub-unit are variable and are chosen based on a mismatch between an amplitude parameter and a group delay parameter across the available frequency spectrum; and
transmitting the data, via a beamforming technique, from the first device to the second device using the selected frequency sub-unit.

2. The method of claim 1 , wherein the first device is a base station and the second device is a mobile device.

3. The method of claim 1 , wherein the first device is a mobile device and the second device is a base station.

4. The method of claim 1 , wherein both the first device and the second device are mobile devices or both the first device and the second device are base stations.

5. The method of claim 1 , wherein the parameter is associated with a data type of an application on the second device, the application being chosen by a user and requiring the data.

6. The method of claim 1 , wherein the selected frequency sub-unit is selected based on at least one of the direction, a data type, a latency parameter, an application chosen for use on the second device, a priority of the second device, an atmospheric condition, a distance between the first device and the second device, and a mismatch between an amplitude differential and a group delay differential, wherein the amplitude differential is associated with different amplitudes of different signals transmitted from different antennas from the first device, and wherein the group delay differential is associated with phase delay differences between the different signals transmitted from the different antennas from the first device.

7. The method of claim 1 , wherein the selected frequency sub-unit has one of a fixed frequency width and a variable frequency width.

8. The method of claim 1 , wherein the selected frequency sub-unit has one of a fixed frequency range and a variable frequency range.

9. The method of claim 1 , wherein (1) the amplitude parameter comprises an amplitude differential which identifies differences in amplitude between a first signal transmitted from a first antenna and a second signal transmitted from a second antenna, and (2) the group delay parameter comprises a group delay differential which identifies a difference in delay between the first signal and the second signal.

10. The method of claim 9 , wherein the set of frequencies within the selected frequency sub-unit are chosen based on characteristics of the mismatch.

11. The method of claim 1 , further comprising transmitting signals from a plurality of antennas from the first device having characteristics that cause a null in a second direction.

12. The method of claim 1 , wherein the selection of the frequency sub-unit is based in part on a parameter associated with how the first device can equalize any mismatch in frequencies associated with the selected frequency sub-unit between an amplitude parameter and a group delay parameter.

13. The method of claim 1 , wherein the data comprises a first portion of data and the transmitting comprises transmitting the first portion of data, the method further comprising:
after transmitting the first portion of data, receiving a selection of a second frequency sub-unit to yield a second selected frequency sub-unit; and
transmitting a second portion of data to the second device using the second selected frequency sub-unit.

14. The method of claim 13 , wherein a frequency range in the second selected frequency sub-unit differs from a frequency range of the selected frequency sub-unit.

15. The method of claim 1 , further comprising:
determining which frequencies within the selected frequency sub-unit experience interference.

16. The method of claim 15 , further comprising
excising the frequencies within the selected frequency sub-unit when transmitting the data.

17. The method of claim 1 , further comprising:
receiving a selection of a second frequency sub-unit chosen from the plurality of frequency sub-units to yield a second selected frequency sub-unit, wherein transmitting the data further comprises transmitting the data, via the beamforming technique, from the first device to the second device at a data type and using the selected frequency sub-unit and the second selected frequency sub-unit.

18. The method of claim 17 , wherein the selected frequency sub-unit and the second selected frequency sub-unit have one of a contiguous frequency range and a non-contiguous frequency range.

19. A system comprising:
a processor; and
a computer-readable storage medium having instructions stored which, when executed by the processor, cause the processor to perform operations comprising:
receiving data, to be transmitted from a first device to a second device, and a parameter;
receiving a direction indicating a location of the second device relative to the first device;
based on the direction and the parameter, receiving a selection of a frequency sub-unit chosen from a plurality of frequency sub-units covering an available frequency spectrum, to yield a selected frequency sub-unit, wherein a set of frequencies within the selected frequency sub-unit are variable and are chosen based on a mismatch between an amplitude parameter and a group delay parameter across the available frequency spectrum; and
transmitting the data, via a beamforming technique, from the first device to the second device using the selected frequency sub-unit.

20. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising:
receiving data, to be transmitted from a first device to a second device, and a parameter;
receiving a direction indicating a location of the second device relative to the first device;
based on the direction and the parameter, receiving a selection of a frequency sub-unit chosen from a plurality of frequency sub-units covering an available frequency spectrum, to yield a selected frequency sub-unit, wherein a set of frequencies within the selected frequency sub-unit are variable and are chosen based on a mismatch between an amplitude parameter and a group delay parameter across the available frequency spectrum; and
transmitting the data, via a beamforming technique, from the first device to the second device using the selected frequency sub-unit.

21. A method comprising:
partitioning a frequency spectrum into M sub-bands;
assigning N beams for each of the M sub-bands;
based on a location of a device relative to a cell, selecting a beam of the N beams having a sub-band chosen from the M sub-bands; and
transmitting the beam from a transmitter to the device, wherein the beam is transmitted in a direction associated with the location of the device, and wherein the method further comprises transmitting at least one other beam having a same frequency spectrum as the beam but in a different direction from the direction to maintain spatial domain orthogonality.

22. The method of claim 21 , wherein the beam is one of a beam for transm

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Cai Khiem Van

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04W28/06

  Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} · CPC title

• H04W28/18

  Negotiating wireless communication parameters · CPC title

• H04B7/0413

  MIMO systems · CPC title