Remote Unit for Communicating with Base Stations and Terminal Devices

• US 20140269859A1
• Filed: 03/14/2014
• Published: 09/18/2014
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: Andrew LLC (CommScope Holding Company, Inc.)
• Inventors: Hanson, Van E., Kummetz, Thomas, Williamson, Michael J.
• Granted Patent: US 9,106,315 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• 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: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A remote unit of a distributed antenna system is disclosed that can communicate analog RF signals with both base stations and terminal devices in a coverage zone serviced by the remote unit. In some aspects, the remote unit can include a signal processing module and a transceiver. The transceiver can communicate RF signals between a master unit of the distributed antenna system and a terminal device. The transceiver can also receive analog downlink RF signals from a base station. The signal processing module can convert the analog downlink RF signals to digital downlink signals and provide the digital downlink signals to the master unit.

Claims

1. A distributed antenna system comprising:

a master unit;

a first remote unit communicatively coupled to the master unit; and

a second remote unit communicatively coupled to the master unit;

wherein the first remote unit is configured for;

receiving analog downlink RF signals from a base station,

converting the analog downlink RF signals to digital downlink signals, and

providing the digital downlink signals to the master unit;

wherein the master unit is configured for transmitting the digital downlink signals received from the first remote unit to the second remote unit.

2. The distributed antenna system of claim 1, wherein the master unit is further configured to communicate signals between an additional base station and the second remote unit.

3. The distributed antenna system of claim 1, wherein the first remote unit is further configured for communicating RF signals between the master unit and the terminal device.

4. The distributed antenna system of claim 3, wherein the first remote unit comprises:

a first duplexer configured for isolating downlink RF signals transmitted to the terminal device from uplink RF signals received from the terminal device; and

a second duplexer configured for isolating the analog uplink RF signals transmitted to the base station from analog downlink RF signals received from the base station.

5. The distributed antenna system of claim 3, wherein the first remote unit comprises:

a configurable isolation sub-system that is configured for operating in a first mode and a second mode, wherein the first mode comprises isolating downlink RF signals transmitted to the terminal device from uplink RF signals received from the terminal device and the second mode comprises isolating the analog uplink RF signals transmitted to the base station from analog downlink RF signals received from the base station.

6. The distributed antenna system of claim 5, wherein the configurable isolation sub-system comprises at least one configurable filter, wherein the at least one configurable filter in the first mode is configured to attenuate signals outside of a first frequency band for receiving the analog downlink RF signals from the base station, wherein the at least one configurable filter in the second mode is configured to attenuate signals outside of a second frequency band for receiving the analog uplink RF signals from the terminal device.

7. The distributed antenna system of claim 1,

wherein the first remote unit is further configured for:

receiving a signal from the terminal device, and

providing the signal to the master unit;

wherein the master unit is further configured for providing the signal received from the first remote unit to the second remote unit;

wherein the second remote unit is configured for transmitting the signal to at least one additional terminal device.

8. The distributed antenna system of claim 1, wherein the master unit is further configured for instructing the first remote unit to establish a communication link with the base station in response to detecting a malfunction with respect to an additional communication link between the master unit and an additional base station.

9. The distributed antenna system of claim 8, wherein each of the first and second remote units is further configured for:

identifying the base station by scanning downlink frequency bands, and

detecting signal traffic from the base station in at least one of the scanned downlink frequency bands;

wherein the master unit is further configured for configuring the first remote unit to establish the communication link with the base station based on the signal traffic detected by the first remote unit exceeding a threshold signal level or satisfying specified signal quality criteria.

10. The distributed antenna system of claim 9, wherein the master unit is further configured for responding to detecting a cessation of the malfunction by configuring the first remote unit to terminate the communication link with the base station.

11. A remote unit of a distributed antenna system, the remote unit comprising:

a transceiver configured for;

communicating RF signals between a master unit of the distributed antenna system and a terminal device, and

receiving analog downlink RF signals from a base station; and

a signal processing module configured for;

converting the analog downlink RF signals to digital downlink signals, and

providing the digital downlink signals to the master unit.

12. The remote unit of claim 11, wherein the remote unit further comprises:

a first duplexer configured for isolating downlink RF signals transmitted to the terminal device from uplink RF signals received from the terminal device; and

a second duplexer configured for isolating the analog uplink RF signals transmitted to the base station from analog downlink RF signals received from the base station.

13. The remote unit of claim 11, wherein the remote unit further comprises:

a configurable isolation sub-system that is configured for operating in a first mode and a second mode, wherein the first mode comprises isolating downlink RF signals transmitted to the terminal device from uplink RF signals received from the terminal device and the second mode comprises isolating the analog uplink RF signals transmitted to the base station from analog downlink RF signals received from the base station.

14. The remote unit of claim 13, wherein the configurable isolation sub-system comprises at least one configurable filter, wherein the at least one configurable filter in the first mode is configured to attenuate signals outside of a first frequency band for receiving the analog downlink RF signals from the base station, wherein the at least one configurable filter in the second mode is configured to attenuate signals outside of a second frequency band for receiving the analog uplink RF signals from the terminal device.

15. A distributed antenna system for providing device-to-device communication, the distributed antenna system comprising:

a first remote unit configured for receiving a signal from a first terminal device;

a second remote unit configured for transmitting the signal to a second terminal device; and

a master unit communicatively coupled to the first and second remote units, the master unit configured for receiving the signal from the first remote unit and providing the signal to the second remote unit for transmission to the second terminal device.

16. The distributed antenna system of claim 15, wherein the first remote unit is further configured for:

detecting that the signal is received at a signal level that exceeds a threshold signal level; and

switching to a receive mode for receiving signals from the first terminal device based on the signal level exceeding the threshold signal level.

17. The distributed antenna system of claim 16, wherein the first remote unit is further configured for:

receiving an additional signal from the first terminal device; and

detecting that the additional signal is received at an additional signal level that does not exceed the threshold signal level; and

switching to a transmit mode for transmitting signals to the second terminal device based on the additional signal level not exceeding the threshold signal level.

18. The distributed antenna system of claim 15, wherein the master unit is further configured for:

determining that the first terminal device is closer to a first geographical location of the first remote unit than a second geographical location of the second remote unit; and

based on the first terminal device being closer to the first geographical location;

setting the first remote unit to a receive mode for receiving signals from the first terminal device, and

setting the second remote unit to a transmit mode for transmitting signals to the second terminal device.

19. The distributed antenna system of claim 15,

wherein the first remote unit comprises a plurality of remote units configured for receiving the signal from the first terminal device, wherein the master unit is further configured for:

receiving the signal from each of the plurality of remote units;

combining the signals received from the plurality of remote units into a combined signal; and

providing the combined signal to the second remote unit for transmission to the second terminal device.

20. The distributed antenna system of claim 15, wherein the first and second remote units are configured for communicating the signal between the first and second terminals in a simplex mode.

21. The distributed antenna system of claim 15, wherein the first and second remote units are configured for communicating the signal between the first and second terminals in a duplex mode.

22. The distributed antenna system of claim 15, wherein the first remote unit is further configured for:

receiving analog downlink RF signals from a base station,

converting the analog downlink RF signals to digital downlink signals, and

providing the digital downlink signals to the master unit;

wherein the master unit is configured for transmitting the digital downlink signals received from the first remote unit to the second remote unit.