METHOD AND APPARATUS FOR USE WITH A RADIO DISTRIBUTED ANTENNA SYSTEM HAVING A CLOCK REFERENCE

• US 20170079038A1
• Filed: 06/10/2016
• Published: 03/16/2017
• Est. Priority Date: 09/16/2015
• 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: Gerszberg, Irwin, Henry, Paul Shala, Bennett, Robert, Barzegar, Farhad, Barnickel, Donald J., Willis, Thomas M. III
• Granted Patent: US 10,079,661 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04J 3/0638 Clock or time synchronisation among nodes; Internode synchronisation synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 7/0008 Synchronisation information channels, e.g. clock distribution lines

Abstract

Aspects of the subject disclosure may include, for example, receiving, by a network element of a distributed antenna system, a clock signal, a control channel and a first modulated signal at a first carrier frequency, the first modulated signal including first communications data provided by a base station and directed to a mobile communication device. The clock signal synchronizes timing of digital control channel processing by the network element to recover instructions from the control channel. The instructions in the control channel direct the network element of the distributed antenna system to convert the first modulated signal at the first carrier frequency to the first modulated signal in a first spectral segment. Other embodiments are disclosed.

Claims

1. A method, comprising:

receiving, by a system including circuitry, a first modulated signal in a first spectral segment directed to a mobile communication device, wherein the first modulated signal conforms to a signaling protocol;

converting, by the system, the first modulated signal in the first spectral segment to the first modulated signal at a first carrier frequency based on a signal processing of the first modulated signal and without modifying the signaling protocol of the first modulated signal, wherein the first carrier frequency is outside the first spectral segment;

transmitting, by the system, instructions in a control channel to direct a network element of a distributed antenna system to convert the first modulated signal at the first carrier frequency to the first modulated signal in the first spectral segment; and

transmitting, by the system, a clock signal with the first modulated signal at the first carrier frequency to the network element of the distributed antenna system, wherein the clock signal synchronizes timing of digital control channel processing of the network element to recover the instructions from the control channel.

2. The method of claim 1, further comprising transmitting, by the system, a reference signal with the first modulated signal at the first carrier frequency to the network element of the distributed antenna system, the reference signal enabling the network element to reduce a phase error when reconverting the first modulated signal at the first carrier frequency to the first modulated signal in the first spectral segment for wireless distribution of the first modulated signal to the mobile communication device in the first spectral segment.

3. The method of claim 1, wherein the instructions are transmitted as digital data via the control channel.

4. The method of claim 1, wherein the first carrier frequency is in a millimeter-wave frequency band.

5. The method of claim 1, wherein the first modulated signal is generated by modulating signals in a plurality of frequency channels according to the signaling protocol to generate the first modulated signal in the first spectral segment.

6. The method of claim 1, wherein the signaling protocol comprises a Long-Term Evolution (LTE) wireless protocol or a fifth generation cellular communications protocol.

7. The method of claim 1, wherein the converting by the system comprises up-converting the first modulated signal in the first spectral segment to the first modulated signal at the first carrier frequency.

8. The method of claim 7, wherein the converting by the network element comprises down-converting the first modulated signal at the first carrier frequency to the first modulated signal in the first spectral segment.

9. The method of claim 1, wherein the converting by the system comprises down-converting the first modulated signal in the first spectral segment to the first modulated signal at the first carrier frequency.

10. The method of claim 9, wherein the converting by the network element comprises up-converting the first modulated signal at the first carrier frequency to the first modulated signal in the first spectral segment.

11. The method of claim 1, further comprising receiving, by the system, a second modulated signal at a second carrier frequency from the network element, wherein the mobile communication device generates the second modulated signal in a second spectral segment, and wherein the network element converts the second modulated signal in the second spectral segment to the second modulated signal at the second carrier frequency and transmits the second modulated signal at the second carrier frequency and a reference signal.

12. The method of claim 11, further comprising:

converting, by the system, the second modulated signal at the second carrier frequency to the second modulated signal in the second spectral segment utilizing the reference signal to remove distortion in the second modulated signal at the second carrier frequency; and

sending, by the system, the second modulated signal in the second spectral segment to a base station for processing.

13. The method of claim 11, wherein the second spectral segment differs from the first spectral segment, and wherein the first carrier frequency differs from the second carrier frequency.

14. The method of claim 1, wherein the clock signal is transmitted via modulation of the reference signal.

15. A device, comprising:

a base station interface configured to receive from a base station a first modulated signal in a first spectral segment for transmission to a mobile communication device, wherein the first modulated signal conforms to a signaling protocol; and

a transceiver configured to convert the first modulated signal in the first spectral segment to the first modulated signal at a first carrier frequency based on a signal processing of the first modulated signal and without modifying the signaling protocol of the first modulated signal, wherein the transceiver is further configured to transmit instructions in a control channel to direct a network element of a distributed antenna system to convert the first modulated signal at the first carrier frequency to the first modulated signal in a selected spectral segment and to transmit a clock signal with the first modulated signal at the first carrier frequency to the network element of the distributed antenna system, wherein the clock signal synchronizes timing of digital control channel processing of the network element to recover the instructions from the control channel.

16. The device of claim 15, wherein the transceiver is further configured to transmit a reference signal with the first modulated signal at the first carrier frequency to the network element of the distributed antenna system for wireless distribution of the first modulated signal to the mobile communication device in the first spectral segment, the reference signal enabling the network element to reduce a phase error during processing of the first modulated signal from the first carrier frequency to the first spectral segment, wherein the reference signal is transmitted at an in-band frequency relative to the control channel.

17. The device of claim 16, wherein the clock signal is transmitted via modulation of the reference signal.

18. The device of claim 15, wherein the transceiver receives a second modulated signal at a second carrier frequency from the network element and a reference signal, wherein the mobile communication device generates the second modulated signal in a second spectral segment, wherein the network element converts the second modulated signal in the second spectral segment to the second modulated signal at the second carrier frequency and transmits the second modulated signal at the second carrier frequency and wherein the reference signal is provided to reduce a phase error during processing of the second modulated signal from the second carrier frequency to the second spectral segment.

19. A method, comprising:

receiving, by a network element of a distributed antenna system, a clock signal, a control channel and a modulated signal at a carrier frequency, the modulated signal including communications data provided by a base station and directed to a mobile communication device, wherein the clock signal synchronizes timing of digital control channel processing by the network element to recover instructions from the control channel, wherein the instructions in the control channel direct the network element of the distributed antenna system to convert the modulated signal at the carrier frequency to the modulated signal in a spectral segment;

converting, by the network element, the modulated signal at the carrier frequency to the modulated signal in the spectral segment in accordance with the instructions and based on a signal processing of the modulated signal; and

wirelessly transmitting, by the network element, the modulated signal at the spectral segment to the mobile communication device.

20. The method of claim 19, wherein the clock signal is received via demodulation of a reference signal provided to reduce a phase error during processing of the modulated signal from the carrier frequency to the spectral segment.