Method and system for soft frequency reuse in a distributed antenna system

• US 9,197,358 B2
• Filed: 05/14/2013
• Issued: 11/24/2015
• Est. Priority Date: 05/18/2012
• Status: Active Grant

• Current Assignee: Dali Wireless Inc. (Dali Systems Co., Ltd.)
• Original Assignee: Dali Systems Co., Ltd.
• Inventors: Hejazi, Seyed Amin, Stapleton, Shawn Patrick
• Primary Examiner(s): Chery, Dady
• Application Number:
  US13/894,309
• Publication Number:
  US 20140233468A1
• Time in Patent Office: 924 Days
• Field of Search: 370/329, 370/330, 370/335, 370/336, 370/338, 370341-347, 455/403, 455/429, 455/427, 455/430, 455/446, 455/447, 455/450, 455/452.1, 455/509, 455/517
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• 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
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A method for routing and switching operator RF signals includes providing one or more Digital Remote Units (DRUs) and providing at least one Digital Access Unit (DAU) configured to communicate with at least one of the one or more DRUs. A first DRU is operable to communicate using a first set of frequencies characterized by a first frequency band over a first geographic footprint and a second set of frequencies characterized by a second frequency band different from the first frequency band over a second geographic footprint including and surrounding the first geographic footprint. A second DRU is operable to communicate using the first set of frequencies over a third geographical footprint and a third set of frequencies characterized by a third frequency band different from the first frequency band and the second frequency band over a fourth geographic footprint including and surrounding the third geographic footprint.

Claims

1. A method for routing and switching operator RF signals, the method comprising:

providing one or more Digital Remote Units (DRUs), each configured to receive one or more downlink radio frequencies and to transmit one or more uplink radio frequencies;

providing at least one Digital Access Unit (DAU) configured to communicate with at least one of the one or more DRUs;

wherein a first DRU in a first cell is operable to communicate using;

a first set of frequencies characterized by a first frequency band over a first geographic footprint; and

a second set of frequencies characterized by a second frequency band different from the first frequency band over a second geographic footprint including and surrounding the first geographic footprint;

wherein a second DRU in a second cell is operable to communicate using;

the first set of frequencies over a third geographical footprint; and

a third set of frequencies characterized by a third frequency band different from the first frequency band and the second frequency band over a fourth geographic footprint including and surrounding the third geographic footprint.

2. The method of claim 1 wherein the DRUs comprise remote radio units.

3. The method of claim 1 further comprising communicating between a plurality of Base Transceiver Stations (BTS) coupled to the at least one DAU.

4. The method of claim 3 wherein one or more of the plurality of BTSs are coupled to the at least one DAU using BTS sector RF connections.

5. The method of claim 1 further comprising transporting signals between the one or more DRUs and the at least one DAU.

6. The method of claim 1 wherein a power level associated with the first set of frequencies is less than power levels associated with the second set of frequencies and the third set of frequencies.

7. A method of distributing communications frequencies, the method providing:

providing a set of communications units;

transmitting and receiving, from a first communications unit of the set of communications units;

a first set of frequencies characterized by a first frequency band and a first geographic footprint; and

a second set of frequencies characterized by a second frequency band different from the first frequency band and a second geographic footprint larger than and at least partially surrounding the first geographic footprint; and

transmitting, and receiving, from a second communications unit of the set of communications units;

a third set of frequencies including one or more frequencies in the first frequency band and a third geographical footprint; and

a fourth set of frequencies including one or more frequencies in a third frequency band and a fourth geographical footprint larger than and at least partially surrounding the third geographical footprint.

8. The method of claim 7 wherein the set of communications units includes a plurality of remote units in communication with a host unit.

9. The method of claim 7 wherein the first geographic footprint includes a location of the first communications unit.

10. The method of claim 9 wherein the second geographic footprint covers the first geographic footprint and further extends over a peripheral footprint adjacent the first geographical footprint.

11. The method of claim 7 wherein the third geographical footprint includes a location of the second communications unit.

12. The method of claim 11 wherein the fourth geographical footprint covers the third geographical footprint and extends over a peripheral footprint adjacent the third geographical footprint.

13. The method of claim 7 wherein the second geographical footprint abuts the fourth geographical footprint.

14. The method of claim 7 further comprising transmitting, and receiving, from a third communications unit of the set of communications units:

a fifth set of frequencies including one or more frequencies in the first frequency band and a fifth geographical footprint; and

a sixth set of frequencies in a fourth frequency band and a sixth geographical footprint larger than and at least partially surrounding the fifth geographical footprint.

15. A communications system comprising:

a host unit;

a first communications unit coupled to the host unit and operable to transmit and receive communications using a first set of frequencies in a first frequency range and associated with a first geographical footprint and a second set of frequencies in a second frequency range and associated with a second geographical footprint larger than the first geographical footprint; and

a second communications unit coupled to the host unit and operable to transmit and receive communications using one or more of the first set of frequencies in a region associated with a third geographical footprint and a third set of frequencies in a third frequency range and associated with a fourth geographical footprint larger than the third geographical footprint.

16. The communications system of claim 15 wherein the host unit comprises a DAU, the first communications unit comprises a first DRU, and the second communication unit comprises a second DRU.

17. The communications system of claim 15 wherein the communications using the first set of frequencies in the first frequency range are associated with a first power level and the communications using the second set of frequencies in the second frequency range are associated with a second power level greater than the first power level.

18. The communications system of claim 15 wherein the communications using one or more of the first set of frequencies in the region associated with a third geographical footprint are associated with a first power level and the communications using the third set of frequencies in the third frequency range are associated with a second power level greater than the first power level.

19. The communications system of claim 15 wherein the first geographic footprint is characterized by a first border and the second geographic footprint is characterized by a second border, wherein a predetermined distance separates the first border and the second border.

20. The communications system of claim 15 wherein the first frequency band and the second frequency band are contiguous frequency bands.

21. The communications system of claim 15 wherein the first frequency range, the second frequency range, and the third frequency range include distinct frequencies.