Remotely reconfigureable distributed antenna system and methods

• US 9,419,714 B2
• Filed: 01/31/2014
• Issued: 08/16/2016
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Dali Wireless Inc. (Dali Systems Co., Ltd.)
• Original Assignee: Dali Systems Co., Ltd.
• Inventors: Lemson, Paul, Stapleton, Shawn Patrick, Trajkovic, Sasa, Lee, Albert S.
• Primary Examiner(s): Rego, Dominic
• Application Number:
  US14/169,719
• Publication Number:
  US 20140286247A1
• Time in Patent Office: 928 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H03F 1/3247 using feedback acting on predistortion circuits H03F1/3264 takes precedence
• CPC Class Codes: H03F 2200/204 A hybrid coupler being used at the output of an amplifier circuit
• CPC Class Codes: H03F 2201/3224 Predistortion being done for compensating memory effects
• CPC Class Codes: H03F 2201/3233 Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 10/2575 Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
• CPC Class Codes: H04B 10/25753 Distribution optical network, e.g. between a base station and a plurality of remote units
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54
• CPC Class Codes: H04L 45/56 Routing software
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04Q 11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 2011/0081 Fault tolerance; Redundancy; Recovery; Reconfigurability
• CPC Class Codes: H04Q 2213/1301 Optical transmission, optical switches
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. The present disclosure enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as flexible simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc.

Claims

1. A system for transmitting signals, comprising:

a plurality of remote radio units; and

a plurality of digital access units each coupled to another one of the plurality of digital access units via a bidirectional cable, wherein one of the plurality of digital access units is coupled to a first base station, the one of the plurality of digital access units configured to communicate with at least a first portion of the plurality of remote radio units, and wherein another one of the plurality of digital access units is coupled to a second base station, the another one of the plurality of digital access units configured to communicate with at least a second portion of the plurality of remote radio units,

wherein the first portion of the plurality of remote radio units are each configured to packetize first uplink signals for transmission to the one of the plurality of digital access units, and the one of the plurality of digital access units is configured to packetize first downlink signals for transmission to the first portion of the plurality of remote radio units, and

wherein the second portion of the plurality of remote radio units are each configured to packetize second uplink signals for transmission to the another one of the plurality of digital access units, and the another one of the plurality of digital access units is configured to packetize second downlink signals for transmission to the second portion of the plurality of remote radio units.

2. The system of claim 1 wherein the first downlink signals correspond to a first plurality of carriers, and each of the first portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the first plurality of carriers, and wherein the second downlink signals correspond to a second plurality of carriers, and each of the second portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the second plurality of carriers.

3. The system of claim 1 wherein the first portion of the plurality of remote radio units are interconnected with each other in a daisy chain configuration via bidirectional fiber optic cables, and the second portion of the plurality of remote radio units are interconnected with each other in a daisy chain configuration via bidirectional fiber optic cables.

4. The system of claim 1 wherein a first one of the first portion of the plurality of remote radio units is coupled to the one of the plurality of digital access units using a first bidirectional cable, and a second one of the second portion of the plurality of remote radio units is coupled to the another one of the plurality of digital access units using a second bidirectional cable.

5. The system of claim 1 wherein the one of the plurality of digital access units and the another one of the plurality of digital access units are configured to communicate via the bidirectional cable.

6. The system of claim 1 wherein the one of the plurality of digital access units is configured to transmit the first uplink signals to the another one of the plurality of digital access units via the bidirectional cable.

7. The system of claim 1 wherein the one of the plurality of digital access units is configured to receive the second downlink signals from the another one of the plurality of digital access units via the bidirectional cable, and the one of the plurality of digital access units is configured to transmit the second downlink signals to the first portion of the plurality of remote radio units.

8. The system of claim 1 wherein the first downlink signals include signals from the first base station and signals from the second base station.

9. The system of claim 1 wherein the first uplink signals include signals directed to the first base station and signals directed to the second base station.

10. The system of claim 1 wherein the first downlink signals correspond to a first plurality of channels, and each of the first portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the first plurality of channels, and wherein the second downlink signals correspond to a second plurality of channels, and each of the second portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the second plurality of channels.

11. A system for transmitting signals, comprising:

a plurality of remote radio units; and

a plurality of digital access units each coupled to another one of the plurality of digital access, wherein a first digital access unit of the plurality of digital access units is coupled to a first signal source, the first digital access unit configured to communicate directly with a first portion of the plurality of remote radio units and to communicate with a second portion of the plurality of remote radio units via a second digital access unit of the plurality of digital access units,

wherein the first portion of the plurality of remote radio units are each configured to transmit first uplink signals, the first uplink signals including signals directed to the first digital access unit and signals directed to the second digital access unit, and the first digital access unit is configured to transmit first downlink signals to the first portion of the plurality of remote radio units, and

wherein the second portion of the plurality of remote radio units are each configured to transmit second uplink signals, the second uplink signals including signals directed to the first digital access unit and signals directed to the second digital access unit, and the second digital access unit is configured transmit second downlink signals to the second portion of the plurality of remote radio units.

12. The system of claim 11 wherein the first downlink signals correspond to a first plurality of carriers, and each of the first portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the first plurality of carriers, and wherein the second downlink signals correspond to a second plurality of carriers, and each of the second portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the second plurality of carriers.

13. The system of claim 11 wherein the first portion of the plurality of remote radio units are interconnected with each other in a daisy chain configuration, and the second portion of the plurality of remote radio units are interconnected with each other in a daisy chain configuration.

14. The system of claim 11 wherein a first one of the first portion of the plurality of remote radio units is coupled to the first digital access unit using a first bidirectional cable, and a second one of the second portion of the plurality of remote radio units is coupled to the second digital access unit using a second bidirectional cable.

15. The system of claim 11 wherein the first digital access unit and the second digital access unit are configured to communicate via a bidirectional cable.

16. The system of claim 11 wherein the first digital access unit is configured to transmit the first uplink signals to the second digital access unit.

17. The system of claim 11 wherein the first digital access unit is configured to receive the second downlink signals from the second digital access unit, and the first digital access unit is configured to transmit the second downlink signals to the first portion of the plurality of remote radio units.

18. The system of claim 11 wherein the first downlink signals correspond to a first plurality of channels, and each of the first portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the first plurality of channels, and wherein the second downlink signals correspond to a second plurality of channels, and each of the second portion of the plurality of remote radio units is configured to receive or transmit a respective subset of the second plurality of channels.

19. A system for transmitting signals, comprising:

a plurality of remote radio units; and

a plurality of digital access units each coupled to another one of the plurality of digital access units, wherein one of the plurality of digital access units is coupled to a first signal source, and another one of the plurality of digital access units is configured to communicate with at least a portion of the plurality of remote radio units,

wherein the portion of the plurality of remote radio units are each configured to packetize first uplink signals for transmission to the another one of the plurality of digital access units, and the another one of the plurality of digital access units is configured to packetize first downlink signals for transmission to the portion of the plurality of remote radio units.

20. A system for transmitting signals, comprising:

a plurality of remote radio units; and

a plurality of digital access units each coupled to another one of the plurality of digital access units, wherein a first digital access unit of the plurality of digital access units is coupled to a first signal source and to a second digital access unit of the plurality of digital access units, the first digital access unit configured to communicate with at least a first portion of the plurality of remote radio units, and

wherein the first portion of the plurality of remote radio units are each configured to packetize first uplink signals for transmission to the first digital access unit, and the first digital access unit is configured to packetize first downlink signals for transmission to the first portion of the plurality of remote radio units.

21. A system for transmitting signals, comprising:

a plurality of remote radio units; and

a plurality of digital access units each coupled to another one of the plurality of digital access units, wherein a first digital access unit of the plurality of digital access units is coupled to a first signal source, and a second digital access unit of the plurality of digital access units is configured to communicate with at least a first portion of the plurality of remote radio units,

wherein the first portion of the plurality of remote radio units are each configured to packetize first uplink signals for transmission to the first digital access unit via the second digital access unit, and

wherein the first digital access unit is configured to packetize first downlink signals for transmission to the first portion of the plurality of remote radio units via the second digital access unit.