Remote distributed antenna system

• US 10,484,993 B2
• Filed: 08/29/2018
• Issued: 11/19/2019
• Est. Priority Date: 05/31/2013
• 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: Barzegar, Farhad, Barnickel, Jr., Donald J., Blandino, George, Gerszberg, Irwin, Henry, Paul Shala, Willis, III, Thomas M.
• Primary Examiner(s): Pezzlo, John
• Application Number:
  US16/115,615
• Publication Number:
  US 20190069296A1
• Time in Patent Office: 447 Days
• Field of Search: 370315, 370329, 370430
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04B 7/2612 Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity H04B7/2615 - H04B7/2643 take precedence; provision for broadband connection H04Q11/0478
• CPC Class Codes: H04L 5/0003 Two-dimensional division time-code division H04J11/00, H04J13/00; for time-space division H04B7/0413, H04B7/0697
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 67/561 Adding application-functional data or data for application control, e.g. adding metadata
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

A distributed antenna system is provided that frequency shifts the output of one or more microcells to a 60 GHz or higher frequency range for transmission to a set of distributed antennas. The cellular band outputs of these microcell base station devices are used to modulate a 60 GHz (or higher) carrier wave, yielding a group of subcarriers on the 60 GHz carrier wave. This group will then be transmitted in the air via analog microwave RF unit, after which it can be repeated or radiated to the surrounding area. The repeaters amplify the signal and resend it on the air again toward the next repeater. In places where a microcell is required, the 60 GHz signal is shifted in frequency back to its original frequency (e.g., the 1.9 GHz cellular band) and radiated locally to nearby mobile devices.

Claims

1. A device, comprising:

an antenna;

a memory to store instructions; and

a processor, coupled to the memory, to execute the instructions to facilitate performance of operations, the operations comprising;

receiving a first modulated signal operating in a first cellular band of a plurality of cellular bands, the first modulated signal conforming to a first signaling protocol;

selecting, according to a network condition, a first subcarrier from a plurality of subcarriers of a carrier wave to identify a selected first subcarrier for frequency conversion of the first modulated signal;

generating, via frequency shifting, a first frequency converted signal operating in the selected first subcarrier of the carrier wave by utilizing, according to the selected first subcarrier, a first carrier wave signal to mix with the first modulated signal operating in the first cellular band without modifying the first signaling protocol of the first modulated signal; and

transmitting, by the antenna, the first frequency converted signal operating in the selected first subcarrier.

2. The device of claim 1, wherein the transmitting comprises transmitting the first frequency converted signal for receipt by a first recipient antenna of a first recipient system of a plurality of systems.

3. The device of claim 2, wherein each system of the plurality of systems includes a respective antenna, the plurality of systems forming a distributed antenna system.

4. The device of claim 2, wherein the first recipient antenna provides the first frequency converted signal to the first recipient system to convert the first frequency converted signal operating in the selected first subcarrier to the first modulated signal operating in the first cellular band for wireless delivery to a wireless communication device.

5. The device of claim 4, wherein the first recipient system generates the first modulated signal in the first cellular band by down-converting the first frequency converted signal in the selected first subcarrier to the first modulated signal in the first cellular band for wireless delivery to the wireless communication device.

6. The device of claim 2, wherein the operations further comprise:

receiving a second modulated signal operating in a second cellular band of the plurality of cellular bands, the second modulated signal conforming to a second signaling protocol that differs from the first signaling protocol;

selecting, according to the network condition, a second subcarrier from the plurality of subcarriers of the carrier wave to identify a selected second subcarrier for frequency conversion of the second modulated signal;

generating, via frequency shifting, a second frequency converted signal operating in the selected second subcarrier of the carrier wave by utilizing, according to the selected second subcarrier, a second carrier wave signal to mix with the second modulated signal operating in the second cellular band without modifying the second signaling protocol; and

transmitting, by the antenna, the second frequency converted signal operating in the selected second subcarrier for receipt by the first recipient antenna of the first recipient system for wireless delivery of the second frequency converted signal operating in the selected second subcarrier to a second recipient antenna of a second recipient system of the plurality of systems.

7. The device of claim 6, wherein the first subcarrier and the second subcarrier are combined in the carrier wave by frequency division multiplexing.

8. The device of claim 6, wherein the selected first subcarrier comprises a first millimeter wave frequency band of the carrier wave, and wherein the selected second subcarrier comprises a second millimeter wave frequency band of the carrier wave.

9. The device of claim 2, wherein the first recipient system generates the first modulated signal in the first cellular band by up-converting the first frequency converted signal in the selected first subcarrier to the first modulated signal in the first cellular band for wireless delivery to a wireless communication device.

10. The device of claim 1, wherein the receiving comprises receiving the first modulated signal operating in the first cellular band from a base station.

11. The device of claim 1, wherein the carrier wave includes a control channel comprising metadata that indicates which antenna of a distributed antenna system is to process the first subcarrier of the carrier wave.

12. The device of claim 1, wherein mixing the first carrier wave signal with the first modulated signal in the first cellular band comprises up-converting the first modulated signal in the first cellular band to the first frequency converted signal operating in the selected first subcarrier, the selected first subcarrier having a higher frequency range than the first cellular band.

13. The device of claim 1, wherein mixing the first carrier wave signal with the first modulated signal in the first cellular band comprises down-converting the first modulated signal in the first cellular band to the first frequency converted signal operating in the selected first subcarrier, the selected first subcarrier having a lower frequency range than the first cellular band.

14. A method, comprising:

receiving, by a first system, wireless signals from a plurality of communication devices, the wireless signals corresponding to a plurality of modulated signals;

selecting by the first system, according to a network condition, a plurality of subcarriers of a carrier wave for frequency conversion of the plurality of modulated signals;

frequency shifting, by the first system, the plurality of modulated signals to a plurality of frequency shifted signals operating in the plurality of subcarriers of the carrier wave without modifying a plurality of signaling protocols of the plurality of modulated signals; and

transmitting, by the first system, the plurality of frequency shifted signals operating in the plurality of subcarriers.

15. The method of claim 14, wherein the first system is part of a plurality of systems that each includes an antenna, the plurality of systems forming a distributed antenna system.

16. The method of claim 15, wherein the transmitting comprises transmitting the plurality of frequency shifted signals operating in the plurality of subcarriers for receipt by a second system of the plurality of systems, the second system converting at least one frequency shifted signal of the plurality of frequency shifted signals operating in at least one subcarrier of the plurality of subcarriers to at least one modulated signal of the plurality of modulated signals operating in at least one frequency band of a plurality of frequency bands for delivery to a device.

17. The method of claim 14, wherein the plurality of modulated signals each operate in one of a plurality of frequency bands, and each conforms to one of the plurality of signaling protocols.

18. A base station, comprising:

a memory to store instructions; and

a processor, communicatively coupled to the memory, to execute the instructions to facilitate performance of operations, the operations comprising;

receiving a modulated signal;

selecting, according to a network condition, a subcarrier from a plurality of subcarriers of a carrier wave to identify a selected subcarrier for frequency conversion of the modulated signal, wherein the modulated signal conforms to a signaling protocol;

generating, via frequency shifting, a frequency converted signal operating in the selected subcarrier of the carrier wave by utilizing, according to the selected subcarrier, a carrier wave signal to mix with the modulated signal, wherein the generating comprises utilizing the carrier wave signal to mix with the modulated signal without modifying the signaling protocol of the modulated signal; and

transmitting, by an antenna, the frequency converted signal operating in the subcarrier.

19. The base station of claim 18, wherein the modulated signal operates in a frequency band of a plurality of frequency bands.

20. The base station of claim 18, wherein the transmitting comprises transmitting the frequency converted signal operating in the selected subcarrier to a recipient antenna of a recipient system of a plurality of systems, each system of the plurality of systems including a respective antenna, the plurality of systems forming a distributed antenna system, the recipient antenna providing the frequency converted signal operating in the selected subcarrier to the recipient system to convert the frequency converted signal in the selected subcarrier to the modulated signal for wireless delivery to a communication device.