MASSIVE MULTIPLE-INPUT MULTIPLE-OUTPUT (M-MIMO) WIRELESS DISTRIBUTION SYSTEM (WDS) AND RELATED METHODS FOR OPTIMIZING THE M-MIMO WDS

• US 20180367190A1
• Filed: 08/27/2018
• Published: 12/20/2018
• Est. Priority Date: 06/13/2017
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Liang, Xiaojun, Ng'Oma, Anthony
• Granted Patent: US 10,419,083 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/02 Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas RAKE receivers H04B1/7115
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/0682 using phase diversity (e.g. phase sweeping)
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04W 88/085 Access point devices with remote components
• CPC Class Codes: H04W 88/12 Access point controller devices

Abstract

Embodiments of the disclosure relate to a massive multiple-input multiple-output (M-MIMO) wireless distribution system (WDS) and related methods for optimizing the M-MIMO WDS. In one aspect, the M-MIMO WDS includes a plurality of remote units each deployed at a location and includes one or more antennas to serve a remote coverage area. At least one remote unit can have a different number of the antennas from at least one other remote unit in the M-MIMO WDS. In another aspect, a selected system configuration including the location and number of the antennas associated with each of the remote units can be determined using an iterative algorithm that maximizes a selected system performance indicator of the M-MIMO WDS. As such, it may be possible to optimize the selected system performance indicator at reduced complexity and costs, thus helping to enhance user experiences in the M-MIMO WDS.

Claims

1. A massive multiple-input multiple-output (M-MIMO) wireless distribution system (WDS), comprising:

a plurality of remote units each configured to be deployed at a location to serve a respective remote coverage area; and

a central unit communicatively coupled to each of the plurality of remote units over a communications link among a plurality of communications links, the central unit being configured to;

encode a received downlink communications signal to generate a downlink MIMO communications signal; and

distribute the downlink MIMO communications signal over the plurality of communications links to the plurality of remote units, wherein;

each of the plurality of remote units comprises one or more antennas configured to distribute the downlink MIMO communications signal to at least one client device located in the respective remote coverage area; and

at least one remote unit among the plurality of remote units comprises a different number of antennas from at least one other remote unit among the plurality of remote units.

2. The M-MIMO WDS of claim 1, wherein each of the plurality of remote units is further configured to form at least one radio frequency (RF) beam to distribute the downlink MIMO communications signal to the at least one client device located in the respective remote coverage area.

3. The M-MIMO WDS of claim 2, wherein a location corresponding to each of the plurality of remote units is determined based on client device density distribution throughout a coverage area of the M-MIMO WDS to maximize system capacity of the M-MIMO WDS.

4. The M-MIMO WDS of claim 2, wherein the at least one remote unit among the plurality of remote units is configured to include a higher number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a higher client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

5. The M-MIMO WDS of claim 2, wherein the at least one remote unit among the plurality of remote units is configured to include a lesser number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a lower client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

6. The M-MIMO WDS of claim 2, wherein the central unit comprises electrical-to-optical (E/O) converters configured to convert the downlink MIMO communications signal into a plurality of downlink optical fiber-based MIMO communications signals for distribution to the plurality of remote units over a downlink optical fiber-based communications medium.

7. The M-MIMO WDS of claim 2, wherein the plurality of remote units comprises remote unit optical-to-electrical (O/E) converters and remote unit E/O converters.

8. The M-MIMO WDS of claim 1, wherein a location corresponding to each of the plurality of remote units is determined based on client device density distribution throughout a coverage area of the M-MIMO WDS to maximize system capacity of the M-MIMO WDS.

9. The M-MIMO WDS of claim 1, wherein the at least one remote unit among the plurality of remote units is configured to include a higher number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a higher client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

10. The M-MIMO WDS of claim 1, wherein the at least one remote unit among the plurality of remote units is configured to include a lesser number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a lower client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

11. The M-MIMO WDS of claim 1, wherein:

each of the plurality of remote units is further configured to;

receive at least one uplink communications signal from the at least one client device located in the respective remote coverage area; and

provide the at least one uplink communications signal to the central unit over the communications link among the plurality of communications links; and

the central unit is further configured to combine a plurality of uplink communications signals received from the plurality of remote units.

12. The M-MIMO WDS of claim 11, wherein the central unit comprises electrical-to-optical (E/O) converters configured to convert the downlink MIMO communications signal into a plurality of downlink optical fiber-based MIMO communications signals for distribution to the plurality of remote units over a downlink optical fiber-based communications medium.

13. The M-MIMO WDS of claim 12, wherein the plurality of remote units comprises:

remote unit optical-to-electrical (O/E) converters configured to convert the plurality of downlink optical fiber-based MIMO communications signals into the downlink MIMO communications signal; and

remote unit E/O converters configured to convert the plurality of uplink communications signals into a plurality of uplink optical fiber-based communications signals.

14. The M-MIMO WDS of claim 13, wherein the central unit further comprises O/E converters configured to convert the plurality of uplink optical fiber-based communications signals received from the plurality of remote units into the plurality of uplink communications signals.

15. A massive multiple-input multiple-output (M-MIMO) wireless distribution system (WDS), comprising:

a plurality of remote units each configured to be deployed at a location to serve a respective remote coverage area, each remote unit including at least one remote unit optical-to-electrical (O/E) converter and at least one remote unit electrical-to-optical (E/O) converter; and

a central unit optically coupled to the plurality of remote units over a plurality of optical communications links, the central unit being configured to;

encode a received downlink communications signal to generate a downlink MIMO communications signal; and

distribute the downlink MIMO communications signal over the plurality of communications links to the plurality of remote units, wherein;

each of the plurality of remote units comprises one or more antennas configured to wirelessly distribute the downlink MIMO communications signal to at least one client device located in the respective remote coverage area; and

at least one remote unit among the plurality of remote units comprises a different number of antennas from at least one other remote unit among the plurality of remote units.

16. The M-MIMO WDS of claim 15, wherein the remote unit O/E converters are configured to convert downlink MIMO communications signals into electrical downlink MIMO communications signals prior to wireless distribution to the respective remote coverage areas of the remote units.

17. The M-MIMO WDS of claim 16, wherein a location corresponding to each of the plurality of remote units is determined based on client device density distribution throughout a coverage area of the M-MIMO WDS to maximize system capacity of the M-MIMO WDS.

18. The M-MIMO WDS of claim 16, wherein the at least one remote unit among the plurality of remote units is configured to include a higher number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a higher client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

19. The M-MIMO WDS of claim 16, wherein the at least one remote unit among the plurality of remote units is configured to include a lesser number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a lower client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

20. A massive multiple-input multiple-output (M-MIMO) wireless distribution system (WDS), comprising:

a plurality of remote units each configured to be deployed at a location to serve a respective remote coverage area; and

a central unit communicatively coupled to the plurality of remote units over a plurality of optical communications links, the central unit being configured to distribute a downlink MIMO communications signal over the plurality of optical communications links to the plurality of remote units, wherein;

each of the plurality of remote units comprises one or more antennas configured to distribute the downlink MIMO communications signal to at least one client device located in the respective remote coverage area, and

at least one remote unit among the plurality of remote units comprises a higher number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a higher client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.

21. The M-MIMO WDS of claim 20, wherein the plurality of remote units comprises remote unit optical-to-electrical (O/E) converters configured convert optical communications signals into electrical communications signals.

22. The M-MIMO WDS of claim 21, wherein at least one remote unit among the plurality of remote units is configured to include a lesser number of the antennas than the at least one other remote unit among the plurality of remote units when the respective remote coverage area served by the at least one remote unit has a lower client device density than the respective remote coverage area served by the at least one other remote unit among the plurality of remote units.