DISTRIBUTED ANTENNA SYSTEM WITH UPLINK BANDWIDTH FOR SIGNAL ANALYSIS

• US 20140140225A1
• Filed: 11/20/2012
• Published: 05/22/2014
• Est. Priority Date: 11/20/2012
• Status: Active Grant

• Current Assignee: Outdoor Wireless Networks LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Wala, Philip M.
• Granted Patent: US 9,191,993 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/17 Detection of non-compliance or faulty performance, e.g. response deviations H04B17/18 takes precedence
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• 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 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04W 24/06 Testing, supervising or monitoring using simulated traffic
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

One embodiment is directed towards a distributed antenna system (DAS). The DAS includes a host unit a plurality of remote units communicatively coupled to the host unit. The plurality of remote units are configured to implement a common arrangement of resource blocks for uplink transport signals. The host unit is configured to instruct a subset of the plurality of remote units to send a digital sample stream over a monitor path of their respective uplink transport signals. One or more simulcast modules are configured to sum the monitor paths from the respective uplink transport signals to generate a summed digital sample stream, the one or more simulcast modules configured to send the summed digital sample stream to the host unit. The host unit is configured to provide a signal based on the summed digital sample stream to one or more signal analysis modules.

Claims

1. A distributed antenna system comprising:

a host unit;

a plurality of remote units communicatively coupled to the host unit;

a plurality of communication links to communicatively coupling the host unit to the plurality of remote units, wherein the plurality of remote units are configured to implement a common arrangement of resource blocks for uplink transport signals on associated ones of the plurality of communication links;

one or more simulcast modules configured to implement simulcasting of signals;

wherein the host unit is configured to instruct a subset of the plurality of remote units to send a digital sample stream over a monitor path of their respective uplink transport signals;

wherein the one or more simulcast modules are configured to sum the monitor paths from the respective uplink transport signals to generate a summed digital sample stream, the one or more simulcast modules configured to send the summed digital sample stream to the host unit; and

wherein the host unit is configured to provide a signal based on the summed digital sample stream to one or more signal analysis modules.

2. The distributed antenna system of claim 1, wherein the host unit is configured to command all remotes units in the plurality of remote units except the subset of remote units to send a null signal on the monitor path of their respective uplink transport signals.

3. The distributed antenna system of claim 1, wherein the plurality of remote units are configured to send digital sample streams destined for a base transceiver station on one or more other resource blocks of their respective uplink transport signals;

wherein the plurality of remote units are configured to send like portions of the received RF spectrum on like resource blocks of their respective uplink transport signals;

wherein the one or more simulcast modules are configured to sum the one or more other resource blocks of the respective uplink transport signals to generate one or more other summed digital sample streams;

wherein the one or more simulcast modules are configured to sum like portions of the respective uplink transport signals together and maintain the positioning of digital sample stream within their respective uplink transport signal according to the common arrangement of resource blocks; and

wherein the host unit is operable to provide the one or more other summed digital sample streams to one or more base transceiver stations.

4. The distributed antenna system of claim 3, wherein the monitor path includes one or more first timeslots in a respective digital transport frame and the one or more other resource blocks include one or more other timeslots in the respective digital transport frame.

5. The distributed antenna system of claim 4, wherein the one or more simulcast modules are configured to send a summed digital transport frame wherein one or more first timeslots in the summed digital transport frame correspond to a sum of the one or more first timeslots in the respective digital transport frames, and wherein one or more other timeslots in the summed digital transport frame correspond to a sum of the one or more other timeslots in the respective digital transport frames.

6. The distributed antenna system of claim 1, wherein the one or more signal analysis modules include a position measurement device configured to determine a location of a mobile device.

7. The distributed antenna system of claim 6, wherein the one or more signal analysis modules are configured to determine a location of the mobile device sending signals based on a location of the subset of remote units.

8. The distributed antenna system of claim 6, wherein the position measurement device instructs the host unit which remote units to include in the subset of remote units.

9. The distributed antenna system of claim 5, wherein the one or more signal analysis modules include a self-organization monitor configured to track usage and interference patterns and use that information to direct wireless capacity.

10. The distributed antenna system of claim 1, wherein the host unit is configured to repeatedly modify which of the plurality of remote units send a digital sample stream over the monitor path of their respective uplink transport signals.

11. The distributed antenna system of claim 10, wherein the signal analysis module is configured to analyze signals based on the summed digital sample stream in order to analyze signals from different remote units within the plurality of remote units.

12. The distributed antenna system of claim 11, wherein the host unit is configured to scan through all the remote units such that the signal analysis module can scan signals received by all the remote units.

13. A distributed antenna system comprising:

a host unit operable to receive a first uplink digital transport frame and to send one or more signals based on a first one or more timeslots of a first digital transport frame to one or more base transceiver stations and to send a signal analysis signal based on a second one or more timeslots of the first digital transport frame to one or more signal analysis modules;

a plurality of remote units communicatively coupled to the host unit, each of the plurality of remote antenna units configured to convert received radio frequency (RF) spectrum into a plurality of respective intermediate frequency (IF) digital sample streams, each of the plurality of remote units including a first digital down converter to convert a first digital sample stream of its respective IF digital sample streams into a first baseband digital sample stream and send the first baseband digital sample stream to the host unit over a first one or more timeslots of their respective digital transport frames, each of the plurality of remote units including a second digital down converter configured to selectively convert a second digital sample stream of its respective IF digital sample streams into a second baseband digital sample stream and send the second baseband digital sample stream to the host unit over a second one or more timeslots of their respective digital transport frames; and

one or more simulcast modules between the plurality of remote units and the host unit, the one or more simulcast modules configured to sum the first one or more timeslots of the respective digital transport frames to form the first one or more timeslots of the first digital transport frame and to sum the second one or more timeslots of the respective digital transport frames to form the second one or more timeslots of the first digital transport frame, and to send the first digital transport frame to the host unit.

14. The distributed antenna system of claim 13, wherein each of the plurality of remote units can individually set which spectral region, if any, corresponds to the first digital sample stream and the second digital sample stream.

15. The distributed antenna system of claim 13, wherein the plurality of remote units consists of a first subset and a second subset of remote units, the first subset having their respective second digital down converter set to convert its second digital sample stream into a second baseband digital sample stream and send the second baseband digital sample stream to the host unit over a second one or more timeslots of their respective digital transport frames;

wherein the second subset has their respective second digital down converter set to send zeros on the second one or more timeslots of their respective digital transport frames.

16. The distributed antenna system of claim 15, wherein the plurality of remote units are configured to set whether a baseband digital sample stream is provided on the second one or more timeslots based on a command from the host unit.

17. The distributed antenna system of claim 13, wherein the plurality of remote units are configured to set which spectral region, if any, corresponds to the first digital sample stream and the second digital sample stream based on a command from the host unit.

18. A method of providing digital transport of signals on a radio-frequency (RF) distributed antenna system, the method comprising:

at a remote unit, converting a first spectral region into a first digital sample stream;

at the remote unit, sending the first digital sample stream to the host unit over a first subset of resource blocks of an uplink transport signal;

at the remote unit, receiving a command from the host unit to duplicate at least a portion of the first spectral region;

at the remote unit, converting the at least a portion of the first spectral region into a second digital sample stream; and

at the remote unit, sending the second digital sample stream over a monitor path of the uplink transport signal.

19. The method of claim 18, comprising:

receiving at a simulcast module a plurality digital sample streams from a plurality of uplink transport signals from a plurality of remote units;

summing like resource blocks of the plurality of uplink transport signals to form a summed uplink transport signal; and

sending the summed uplink transport signal to an upstream component.

20. The method of claim 19, comprising:

receiving, at the upstream component, the summed uplink transport signal;

providing portions of the summed uplink transport signal corresponding to the first subset of resource blocks to one or more base stations; and

providing portions of the summed uplink transport signal corresponding to the monitor path to one or more signal analysis modules.

21. The method of claim 20, comprising:

receiving at the host unit a request from the one or more signal analysis modules indicating which subset of the plurality of remote units that the one or more signal analysis modules is to receive signals;

sending a command from the host unit to each remote unit of the subset of the plurality of remote units to instruct each remote unit of the subset of the plurality of remote units to send the at least a portion of the first spectral region over the monitor path of their respective uplink transport signals; and

sending a command from the host unit to all other remote units of the plurality of remote units except the subset of the plurality of remote units to send a null signal on the monitor path of their respective uplink transport signals.

22. The method of claim 21, comprising:

receiving at the host unit a request from the one or more signal analysis modules indicating which portion of the received RF spectrum that the subset of the plurality of remote units is to send over the monitor path of their respective uplink transport signal; and

sending a command from the host unit to each remote unit of the subset of the plurality of remote units indicating which portion of the received RF spectrum to send over the monitor path of their respective uplink transport signal.

23. The method of claim 20, comprising:

repeatedly re-assigning which of the plurality of remote units sends a digital sample stream over the monitor path of their respective uplink transport signal.

24. The method of claim 23, wherein repeatedly re-assigning includes scanning through each of the plurality of remote units.

25. The method of claim 20, determining a position of a mobile device sending signals within the at least a portion of the first spectral region based on which of the plurality of remote units are receiving signals from the mobile device.