Remotely reconfigurable distributed antenna system and methods

• US 9,531,473 B2
• Filed: 11/23/2015
• Issued: 12/27/2016
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Dali Wireless Inc. (Dali Systems Co., Ltd.)
• Original Assignee: Dali Wireless Inc. (Dali Systems Co., Ltd.)
• Inventors: Lemson, Paul, Stapleton, Shawn Patrick, Trajkovic, Sasa, Lee, Albert S.
• Primary Examiner(s): REGO, DOMINIC E
• Application Number:
  US14/949,405
• Publication Number:
  US 20160080082A1
• Time in Patent Office: 400 Days
• Field of Search: 455/562.1, 455/436, 455443-445, 455/447, 455450-454, 455/464, 455/509, 370/328, 370/310.2, 370/338
• 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 method of communicating in a distributed antenna system (DAS), the method comprising:

receiving downlink optical signals at a remote radio unit, the downlink optical signals received from a digital access unit, the downlink optical signals comprising a plurality of carriers;

converting a portion of the downlink optical signals received at the remote radio unit to downlink signals, the portion of the downlink optical signals corresponding to a subset of the plurality of carriers, wherein a number of carriers in the subset of the plurality of carriers is less than a number of carriers in the plurality of carriers, and a number of carriers in the subset of the plurality of carriers is configurable;

transmitting the downlink signals from the remote radio unit as radio frequency signals;

receiving uplink signals at the remote radio unit;

converting the uplink signals received at the remote radio unit to uplink optical signals, wherein the uplink optical signals correspond to the subset of the plurality of carriers; and

sending the uplink optical signals from the remote radio unit to the digital access unit.

2. The method of claim 1 further comprising converting a second portion of the downlink optical signals received at the remote radio unit to downlink signals, the second portion of the downlink optical signals corresponding to a second subset of the plurality of carriers, wherein a number of carriers in the second subset of the plurality of carriers is different from the number of carriers in the subset of the plurality of carriers.

3. The method of claim 1 further comprising increasing the number of carriers in the subset of the plurality of carriers.

4. The method of claim 1 further comprising decreasing the number of carriers in the subset of the plurality of carriers.

5. The method of claim 1 wherein each of the plurality of carriers corresponds to a respective RF band.

6. A host unit for use in the transport of wireless communications, comprising:

at least one interface to communicatively couple the host unit to at least one signal source;

wherein the host unit is capable of receiving a plurality of downlink signals from the at least one signal source;

at least one interface to communicatively couple the host unit to a plurality of remote units, including at least a first remote unit and a second remote unit;

wherein the host unit is capable of sending a digital representation of any downlink signal it receives to any of the plurality of remote units;

wherein the host unit is configurable to transmit a digital representation of a first subset of the plurality of downlink signals to the first remote unit and a digital representation of a second subset of the plurality of downlink signals to the second remote unit, the second subset being different than the first subset; and

wherein the host unit is capable of receiving a digital representation of at least one uplink signal from each of the plurality of remote units.

7. The host unit of claim 6 wherein each downlink signal in the plurality of downlink signals comprises a signal from a mobile telephone carrier.

8. The host unit of claim 6 wherein at least one interface to communicatively couple the host unit to a plurality of remote units comprises an optical interface.

9. The host unit of claim 6 wherein the host unit is capable of packetizing each digital representation of an uplink signal.

10. The host unit of claim 6 wherein the host unit is capable of packetizing each digital representation of an uplink signal in compliance with the Common Public Interface Standard (CPRI) standard.

11. A system for transporting wireless communications, comprising:

a host unit;

a plurality of remote units, including at least a first remote unit and a second remote unit;

wherein the host unit comprises at least one interface to communicatively couple the host unit to at least one signal source;

wherein the host unit is capable of receiving a plurality of downlink signals from the at least one signal source;

wherein the host unit further comprises at least one interface to communicatively couple the host unit to the plurality of remote units;

wherein the host unit is capable of sending a digital representation of any downlink signal it receives to any of the plurality of remote units;

wherein the host unit is configurable to transmit a digital representation of a first subset of the plurality of downlink signals to the first remote unit and a digital representation of a second subset of the plurality of downlink signals to the second remote unit, the second subset being different than the first subset;

wherein the host unit is capable of receiving a digital representation of at least one uplink signal from the each of the plurality of remote units.

12. The system of claim 11 wherein each downlink signal in the plurality of downlink signals comprises a signal from a mobile telephone carrier.

13. The system of claim 11 wherein the at least one interface to communicatively couple the host unit to a plurality of remote units comprises an optical interface.

14. The system of claim 11 wherein the host unit is capable of packetizing each digital representation of an uplink signal.

15. The system of claim 14 wherein each remote comprises at least one interface to communicatively couple the remote unit to another remote unit in a daisy-chain configuration.

16. The system of claim 11 wherein the host unit is capable of packetizing each digital representation of an uplink signal in compliance with the Common Public Interface Standard (CPRI) standard.

17. The system of claim 16 wherein each remote comprises at least one interface to communicatively couple the remote unit to another remote unit in a daisy-chain configuration.

18. The system of claim 11 wherein the host unit is connected to each of the plurality of remote units through a direct connection.

19. The system of claim 11 wherein the host unit is connected to each of the plurality of remote units through an indirect connection.

20. The system of claim 11 wherein the host unit is connected to some of the plurality of remote units through a direct connection and others of the plurality of remote units through an indirect connection.

21. The system of claim 11 wherein each remote comprises at least one interface to communicatively couple the remote unit to another remote unit in a daisy-chain configuration.