Digital distributed antenna systems and methods for advanced cellular communication protocols

• US 9,722,703 B2
• Filed: 03/20/2015
• Issued: 08/01/2017
• Est. Priority Date: 03/21/2014
• Status: Active Grant

• Current Assignee: Outdoor Wireless Networks LLC (CommScope Holding Company, Inc.)
• Original Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Inventors: Fischer, Larry G., Forland, Jody
• Primary Examiner(s): Nguyen, Khai M
• Application Number:
  US14/663,884
• Publication Number:
  US 20150271793A1
• Time in Patent Office: 865 Days
• Field of Search: 455450, 4554521, 4554522, 455453
• CPC Class Codes: H04B 10/25752 Optical arrangements for wireless networks
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

Digital distributed antenna systems and methods for advanced cellular communication protocols are provided. In one embodiment, a digital distributed antenna system comprises: a host unit; a plurality of communication links; a plurality of remote antenna units each coupled to the host unit by one of the plurality of communication links, wherein the communication links transport a downlink digitized RF signal from the host unit to the plurality of remote antenna units, and wherein the remote antenna units are each configured to generate an over-the-air analog RF signal via an antenna from the downlink digitized RF signal; and a localized signal conditioning and control module that extracts from a first digitized RF signal at least one data stream and converts the at least one data stream to baseband data stored in a memory.

Claims

1. A digital distributed antenna system, the system comprising:

a host unit;

a plurality of remote antenna units each communicatively coupled to the host unit, wherein a downlink digitized RF signal is transported from the host unit to the plurality of remote antenna units, and wherein the remote antenna units are each configured to generate an over-the-air analog RF signal via an antenna from the downlink digitized RF signal; and

a localized signal conditioning and control module that extracts from a first digitized RF signal at least one data stream and converts the at least one data stream to baseband data stored in a memory.

2. The system of claim 1, wherein the first digitized RF signal is a downlink signal and the over-the-air analog RF signal is generated at least in part from the baseband data stored in memory.

3. The system of claim 1, wherein the first digitized RF signal is an uplink signal and an uplink digitized RF signal is generated at least in part from the baseband data stored in memory.

4. The system of claim 1, wherein the localized signal conditioning and control module is implemented within at least one of:

a first remote antenna unit of the plurality of antenna units;

the host unit;

or

an interviewing device between a first remote antenna unit and the host unit.

5. The system of claim 1, wherein baseband data comprises one or both of Digitized Baseband RF data and Digital Baseband data.

6. The system of claim 1, the localized signal conditioning and control module further comprising:

at least one digital demodulator;

a conditioner and control component;

the memory; and

at least one digital modulator;

wherein the digital demodulator converts the at least one data stream and stores a result as the baseband data into the memory.

7. The system of claim 6, wherein the digital modulator digitally re-modulates the baseband data into a re-modulated digital RF signal.

8. The system of claim 6, wherein the conditioner and control components applies one or more signal optimization algorithms to the baseband data.

9. The system of claim 6, wherein the digital demodulator demodulates the baseband data from a first RF channel and the digital modulator re-modulates the baseband data onto a second RF channel.

10. The system of claim 6, wherein the conditioner and control component modifies the baseband data before the digital modulator re-modulates the baseband data onto a second RF channel.

11. The system of claim 1, wherein the localized signal conditioning and control module applies one or more signal optimizations to the baseband data.

12. The system of claim 11, wherein the one or more signal optimizations include at least one of the following:

a signal gain adjustment;

a shift in RF carrier channel;

a signal phase adjustment; and

a digital pre-distortion.

13. The system of claim 1, wherein the localized signal conditioning and control module implements with the base station one or more of:

mobility control;

retransmission control;

user-data concatenation-segmentation-reassembly;

physical layer control signals.

14. The system of claim 1, wherein the localized signal conditioning and control module is configured to implement at least one of:

Packet Data Convergence Protocol (PDCP) for user data ciphering and header compression;

Radio Link Control (RLC) protocol for retransmission control by ARQ;

in-sequence packet delivery;

Medium Access Control (MAC) protocol for HARQ;

user data scheduling;

Radio Resource Control (RRC) protocol for mobility,

Quality of Service (QoS), and

security control.

15. A method for a digital distributed antenna system, the digital distributed antenna system including a host unit, and a plurality of remote antenna units each communicatively coupled to the host unit, wherein a downlink digitized RF signal is transported from the host unit to the plurality of remote antenna units, and wherein the remote antenna units are each configured to generate an over-the-air analog RF signal via an antenna from the downlink digitized RF signal, the method comprising:

receiving a digitized RF signal at a localized signal conditioning and control module associated with a first remote antenna unit of the plurality of remote antenna units;

with the localized signal conditioning and control module;

extracting from the digitized RF signal at least one data stream;

down-converting the at least one data stream to baseband data;

storing the baseband data in a memory; and

generating an up-converted stream of digital RF data from the baseband data in the memory.

16. The method of claim 15, wherein, the method further comprising:

generating at least part of the over-the-air analog RF signal by up-converting the baseband data in the memory.

17. The method of claim 15, wherein, the method further comprising:

transporting the up-converted stream of digital RF data to the host unit where it is combined with uplink digital RF signals from at least one other remote antenna unit into a unified uplink digital RF signal.

18. The method of claim 15, wherein the first remote unit comprises a conditioner and control component, the method further comprising:

with the conditioner and control component, applying one or more signal optimizations to the baseband data.

19. The method of claim 18, wherein the one or more signal optimizations include at least one of the following:

a signal gain adjustment;

a shift in RF carrier channel;

a signal phase adjustment; and

a digital pre-distortion.

20. The method of claim 18, wherein with the conditioner and control component, the method further comprises implementing on or more of:

mobility control;

retransmission control;

user-data concatenation-segmentation-reassembly;

physical layer control signals.

21. The method of claim 15, wherein the localized signal conditioning and control module modulates the baseband data onto a different RF channel than an RF channel from which it was down-converted from.

22. The method of claim 15, wherein with the localized signal conditioning and control module, the method further comprises implementing on or more of:

the Packet Data Convergence Protocol (PDCP) for user data ciphering and header compression;

Radio Link Control (RLC) protocol for retransmission control by ARQ;

in-sequence packet delivery;

Medium Access Control (MAC) protocol for HARQ;

user data scheduling;

Radio Resource Control (RRC) protocol for mobility,

Quality of Service (QoS), and

security control.