TRANSPORT DATA REDUCTION FOR DAS SYSTEMS

• US 20140079112A1
• Filed: 11/22/2013
• Published: 03/20/2014
• Est. Priority Date: 06/18/2010
• Status: Active Grant

• Current Assignee: Outdoor Wireless Networks LLC (CommScope Holding Company, Inc.)
• Original Assignee: Andrew LLC (CommScope Holding Company, Inc.)
• Inventors: Ranson, Christopher, Phillips, Fred William, Kummetz, Thomas
• Granted Patent: US 9,014,256 B2
• Time in Patent Office: Days
• US Class Current: 375/240
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/08 at the receiving station
• CPC Class Codes: H04J 3/02 Details electronic switching or gating H03K17/00
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

An endpoint element of a distributed antenna system includes processing circuitry configured for processing a plurality of digital signals for conditioning the signals and compression circuitry configured for compressing at least one of the digital signals according to a compression scheme to yield at least one compressed digital signal and compression settings. The digital signals are combined into a single digital stream and combined and time division multiplexed onto a serial data link with the compression settings. The digital signals are also transmitted with compression settings to another endpoint element over the serial data link.

Claims

1. An endpoint element of a distributed antenna system having multiple endpoints coupled together by serial data links, comprising:

processing circuitry configured for processing a plurality of digital signals, including first and second digital signals, for conditioning the signals;

compression circuitry configured for compressing at least one of the first and second digital signals according to a compression scheme to yield at least one compressed digital signal and compression settings;

circuitry configured for combining the digital signals into a single digital stream;

circuitry configured for combining and time division multiplexing the single digital stream of the digital signals onto a serial data link with the compression settings;

signal transmission circuitry configured for transmitting the digital signals and compression settings to another endpoint element over the serial data link.

2. The endpoint element of claim 1 wherein the compression circuitry is configured for compressing the at least one of the first and second digital signals by individually compressing the first and second digital signals.

3. The endpoint element of claim 1 wherein the compression circuitry is configured for compressing the at least one of the first and second digital signals by:

interlacing the first and second digital signals to form an interlaced stream;

compressing the interlaced stream.

4. The endpoint element of claim 1 wherein the compression circuitry is configured for compressing the at least one of the first and second digital signals by:

forming a delta signal reflective of a difference between the first and second digital signals;

encoding the delta signal;

compressing the encoded delta signal.

5. The endpoint element of claim 1 wherein the signal transmission circuitry is configured for transmitting, over the serial data link, processing information regarding the processing of the digital signals.

6. The endpoint element of claim 1 wherein the compression circuitry is configured for compressing both the first and second digital signals, and compressing the first digital signal using a compression scheme different the a compression scheme used to compress the second digital signal.

7. The endpoint element of claim 1 wherein processing circuitry is configured for processing first and second digital signals that are one of MIMO signals or diversity signals.

8. The endpoint element of claim 1 wherein the circuitry for combining and time division multiplexing the signals combines other data with the compressed digital signal in the digital stream and further comprising data flow circuitry configured for adjusting the amount of other data that is combined.

9. The endpoint element of claim 1 wherein the compression circuitry is configured for providing multiple different compression schemes, and further comprising a compression manager circuit configured for selecting the compression scheme used for compressing signals.

10. The endpoint element of claim 1 wherein the processing circuitry is configured for providing processing coefficients or settings associated with the digital signals.

11. The endpoint element of claim 1 wherein the endpoint element is one of a master unit or a remote unit of a distributed antenna system.

12. The endpoint element of claim 1 further comprising a compression manager circuit coupled with the compression circuitry for controlling the compression circuitry.

13. A method of transmitting data between endpoint elements of a distributed antenna system over a serial data link, comprising:

processing a plurality of digital signals at an endpoint element, including first and second digital signals, for conditioning the signals;

compressing at least one of the first and second digital signals according to a compression scheme to yield at least one compressed digital signal and compression settings;

combining the digital signals into a single digital stream;

combining and time division multiplexing the single digital stream of the digital signals onto a serial data link with the compression settings;

transmitting the digital signals and compression settings to another endpoint element over the serial data link.

14. The method of claim 13 further comprising compressing the at least one of the first and second digital signals by:

interlacing the first and second digital signals to form an interlaced stream;

compressing the interlaced stream.

15. The method of claim 13 further comprising compressing the at least one of the first and second digital signals by:

forming a delta signal reflective of a difference between the first and second digital signals;

encoding the delta signal;

compressing the encoded delta signal.

16. The method of claim 13 further comprising transmitting, over the serial data link, processing information regarding the processing of the digital signals.

17. The method of claim 13 further comprising compressing both the first and second digital signals, and compressing the first digital signal using a compression scheme different the a compression scheme used to compress the second digital signal.

18. The method of claim 13 further comprising processing first and second digital signals that are one of MIMO signals or diversity signals.

19. The method of claim 13 further comprising combining other data with the compressed digital signal in the digital stream.

20. The method of claim 13 further comprising providing multiple different compression schemes and selecting the compression scheme used for compressing signals.