System for and method of configuring distributed antenna communications system

• US 20090061940A1
• Filed: 08/31/2007
• Published: 03/05/2009
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Inventors: Walther, Peter, Scheinert, Stefan
• Granted Patent: US 9,112,547 B2
• Time in Patent Office: Days
• US Class Current: 455/562.100
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A distributed antenna system comprises a plurality of antennas and a multi-port hub. The multi-port hub comprises an interface to a telecommunications network and a plurality of transceivers. The multi-port hub is configured to operate in a first mode (“normal” mode) in which the multi-port hub receives a downlink communications signal via the interface and distributes the downlink communications signal to the plurality of antennas using a selected downlink transmission frequency within a downlink frequency range and in which the multi-port hub receives uplink communications signals from the plurality of antennas at a selected uplink receive frequency. The multi-port hub is also configured to operate in a second mode (“listening” mode) in which the multi-port hub receives communications signals from the plurality of antennas at one or more frequencies within the downlink frequency range. The transmission frequency for the first mode (“normal” mode) may be selected based on field strength of the signals received in the second mode (“listening” mode).

Claims

1. A distributed antenna system comprising:

a plurality of antennas; and

a multi-port hub comprising an interface to a telecommunications network and a plurality of transceivers, wherein the multi-port hub is configured to operate in a first mode in which the multi-port hub receives a downlink communications signal via the interface and distributes the downlink communications signal to the plurality of antennas using a selected downlink transmission frequency within a downlink frequency range and in which the multi-port hub receives uplink communications signals from the plurality of antennas at a selected uplink receive frequency and wherein the multi-port hub is configured to operate in a second mode in which the multi-port hub receives communications signals from the plurality of antennas at one or more frequencies within the downlink frequency range.

2. The distributed antenna system according to claim 1, wherein each transceiver is configurable to transmit at a selected transmission frequency and wherein the transmission frequency for the first mode is selected based on measured field strength of the signals received in the second mode.

3. The distributed antenna system according to claim 1, wherein the multi-port hub enters the second mode in response to detecting the absence of a signal from the interface.

4. The distributed antenna system according to claim 3, wherein the multi-port hub enters the first mode in response to the signal being detected at the interface.

5. The distributed antenna system according to claim 1, further comprising a meter for measuring field strength of signals received by the antennas.

6. The distributed antenna system according to claim 5, the meter being located in a base station coupled to the distributed antenna system via the interface.

7. The distributed antenna system according to claim 1, wherein one or more of the transceivers further comprises a tunable receive signal path for receiving the uplink communications signals in the first mode and for receiving the communications signals at one or more frequencies within the downlink frequency range in the second mode.

8. The distributed antenna system according to claim 1, wherein one or more of the transceivers further comprises first and second receive signal paths, the first path for receiving the uplink communications signals in the first mode and the second path for receiving the communications signals at one or more frequencies within the downlink frequency range in the second mode.

9. The distributed antenna system according to claim 1, wherein the interface further comprises a tunable transmit signal path for transmitting the uplink communications signals to the telecommunications network in the first mode and for transmitting the communications signals at one or more frequencies within the downlink frequency range to the telecommunications network in the second mode.

10. The distributed antenna system according to claim 1, wherein the interface further comprises first and second transmit signal paths, the first path for transmitting the uplink communications signals to the telecommunications network in the first mode and the second path for transmitting the communications signals at one or more frequencies within the downlink frequency range to the telecommunications network in the second mode.

11. A distributed antenna system comprising:

a plurality of antennas;

a meter for measuring field strength of signals received by the antennas; and

a multi-port hub comprising an interface to a telecommunications network and a plurality of transceivers, each transceiver being configurable to transmit at a selected transmission frequency, wherein the multi-port hub is configured to operate in a first mode in which the multi-port hub receives a downlink communications signal via the interface and distributes the downlink communications signal to the plurality of antennas using a selected downlink transmission frequency and in which the multi-port hub receives uplink communications signals from the plurality of antennas at a selected uplink receive frequency and wherein the multi-port hub is configured to operate in a second mode in which the multi-port hub receives communications signals from the plurality of antennas and the meter measures the field strength of each of the signals at a plurality of frequencies, wherein the transmission frequency and the receive frequency for the first mode are selected based on the measured field strength of the signals received in the second mode.

12. The distributed antenna system according to claim 11, wherein in the first mode, the distributed antenna system receives uplink communications signals from one or more mobile units.

13. The distributed antenna system according to claim 12, wherein in the second mode, the distributed antenna system receives downlink communications from one or more nearby base transceiver stations of a cellular network.

14. The distributed antenna system according to claim 11, wherein the multi-port hub enters the second mode in response to receiving a message.

15. The distributed antenna system according to claim 11, wherein the multi-port hub enters the second mode in response to detecting the absence of a signal from the interface.

16. The distributed antenna system according to claim 15, wherein the multi-port hub enters the first mode in response to the signal being detected at the interface.

17. The distributed antenna system according to claim 15, further comprising a base transceiver station coupled to the multi-port hub via the interface wherein the base transceiver station includes the meter.

18. The distributed antenna system according to claim 11, wherein the transmission and receive frequencies used in the second mode are selected to avoid using any frequency detected during the first mode.

19. The distributed antenna system according to claim 11, wherein the transmission frequency used in the second mode is the same as a frequency detected at one or more of the antennas during the first mode and wherein the transmit power for those antennas is adjusted lower than the remaining antennas.

20. The distributed antenna system according to claim 11, wherein the distributed antenna system measures multiple different frequency bands in the first mode, each frequency band comprising a plurality of channel frequencies for which field strength measurements are taken.

21. The distributed antenna system according to claim 11, wherein the transceivers are reconfigurable to operate in the first and second modes by comprising a frequency tunable receive signal path.

22. The distributed antenna system according to claim 11, wherein the transceivers are reconfigurable to operate in the first and second modes by comprising a receive signal path for operation in the second mode and an alternative receive signal path for operation in the first mode.

23. The distributed antenna system according to claim 11, wherein the transceivers are tuned to each of the plurality of frequencies in the first mode.

24. The distributed antenna system according to claim 11, wherein the transceivers are tuned to a frequency band including each of the plurality of frequencies and wherein a tunable filter is coupled to the meter and selectively tuned to each of the plurality of frequencies in the first mode.

25. The distributed antenna system according to claim 11, wherein one or more of the transceivers further comprises a tunable receive signal path for receiving the uplink communications signals in the first mode and for receiving the communications signals at one or more frequencies within the downlink frequency range in the second mode.

26. The distributed antenna system according to claim 11, wherein one or more of the transceivers further comprises first and second receive signal paths, the first path for receiving the uplink communications signals in the first mode and the second path for receiving the communications signals at one or more frequencies within the downlink frequency range in the second mode.

27. The distributed antenna system according to claim 11, wherein the interface further comprises a tunable transmit signal path for transmitting the uplink communications signals to the telecommunications network in the first mode and for transmitting the communications signals at one or more frequencies within the downlink frequency range to the telecommunications network in the second mode.

28. The distributed antenna system according to claim 11, wherein the interface further comprises first and second transmit signal paths, the first path for transmitting the uplink communications signals to the telecommunications network in the first mode and the second path for transmitting the communications signals at one or more frequencies within the downlink frequency range to the telecommunications network in the second mode.