# US 9,439,242 B2 · Time synchronized routing in a distributed antenna system

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- Number: US 9,439,242 B2
- Document ID: US9439242B2
- Status: Granted
- Kind: B2
- Application number: 13/960,346
- Filed: 2013-08-06
- Published: 2014-06-12
- Granted: 2016-09-06
- Earliest claimed: 2012-08-13
- Assignees: Dali Systems Co. Ltd.
- Applicants: Dali Systems Co. Ltd.
- Inventors: Shawn Patrick Stapleton; Qianqi Zhuang
- Web page: https://patentgrep.com/patent/US9439242B2

## CPC

- H04W 56/0005: {synchronizing of arrival of multiple uplinks}
- H04W 88/085: {Access point devices with remote components}
- H04W 40/02: Communication route or path selection, e.g. power-based or shortest path routing
- H04W 40/06: based on characteristics of available antennas
- H04W 56/003: {Arrangements to increase tolerance to errors in transmission or reception timing}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A system for routing signals in a Distributed Antenna System includes a plurality of Digital Access Units (DAUs) and a plurality of Digital Remote Units (DRUs). The plurality of DAUs are coupled and operable to route signals between the plurality of DAUs. The plurality of DRUs are coupled to the plurality of DAUs and operable to transport signals between DRUs and DAUs. The system also includes a plurality of Base Transceiver Stations (BTS) and a plurality of Base Transceiver Station sector RF connections coupled to the plurality of DAUs and operable to route signals between the plurality of DAUs and the plurality of Base Transceiver Stations sector RF port connections. The system further includes one or more delay compensation merge units operable to delay signals transmitted from or received by each of the plurality of DRUs.

## Claims

### Claim 1

A system for routing signals in a Distributed Antenna System, the system comprising:
a plurality of Digital Access Units (DAUs), wherein the plurality of DAUs are coupled and configured to route signals between the plurality of DAUs;
a plurality of Digital Remote Units (DRUs) coupled to the plurality of DAUs and configured to transport signals between the plurality of DRUs and the plurality of DAUs;
a plurality of Base Transceiver Stations (BTSs);
a plurality of Base Transceiver Station sector RF connections coupled to the plurality of DAUs and configured to route signals between the plurality of DAUs and the plurality of Base Transceiver Stations sector RF connections; and
one or more delay compensation merge units configured to delay signals transmitted from or received by each of the plurality of DRUs.

### Claim 2 (depends on 1)

The system of claim 1 wherein each of the one or more delay compensation merge units are integrated as components of each of the plurality of DRUs.

### Claim 3 (depends on 1)

The system of claim 1 wherein at least one of the one or more delay compensation merge units is integrated as a component of one of the plurality of DAUs.

### Claim 4 (depends on 1)

The system of claim 1 wherein the plurality of DAUs are coupled via at least one of Ethernet cable, Optical Fiber, Microwave Line of Sight Link, Wireless Link, or Satellite Link.

### Claim 5 (depends on 1)

The system of claim 1 wherein the plurality of DAUs are coupled to the plurality of DRUs via at least one of Ethernet cable, Optical Fiber, Microwave Line of Sight Link, Wireless Link, or Satellite Link.

### Claim 6 (depends on 1)

The system of claim 1 wherein the plurality of DRUs are connected in a daisy chain configuration.

### Claim 7 (depends on 1)

The system of claim 1 wherein the plurality of DRUs are connected to the DAUs in a star configuration.

### Claim 8 (depends on 1)

The system of claim 1 wherein the plurality of DAUs are connected to the BTSs via at least one of a Ethernet cable, Optical Fiber, Microwave Line of Sight Link, Wireless Link, or Satellite Link.

### Claim 9 (depends on 1)

The system of claim 1 wherein the plurality of DRUs are connected in a loop to a plurality of DAUs.

### Claim 10 (depends on 1)

The system of claim 1 wherein a single DAU port is connected to a plurality of Base Transceiver Stations.

### Claim 11

A method for routing signals in a Distributed Antenna System including a plurality of Digital Access Units (DAUs), a plurality of Digital Remote Units (DRUs), a plurality of Base Transceiver Stations (BTSs), and a plurality of Base Transceiver Station sector RF connections, the method comprising:
transporting signals between the plurality of DRUs and the plurality of DAUs;
routing the signals between the plurality of DAUs;
routing the signals between the plurality of DAUs and the plurality of BTS sector RF connections;
providing routing tables;
using a first delay compensation merge unit in a first DRU of the plurality of DRUs to delay a first signal; and
using a second delay compensation merge unit in a second DRU of the plurality of DRUs to delay a second signal.

### Claim 12 (depends on 11)

The method of claim 11 wherein a power level of each carrier in each DRU of the plurality of DRUs is independently controlled.

### Claim 13 (depends on 11)

The method of claim 11 wherein the first signal comprises an uplink signal associated with the first DRU and the second signal comprises an uplink signal associated with the second DRU.