US 9,960,850 B2Granted

Reducing leaked downlink interference signals in a remote unit uplink path(s) in a distributed antenna system (DAS)

AssigneeCorning Optical Communications Wireless Ltd

InventorsLiav Moshe Daniel, Maor Saig, Motti Yakobi

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Abstract

Methods and systems for reducing leaked downlink interference signals in a remote unit uplink path(s) in a distributed antenna system (DAS) are provided. In a remote antenna unit (RAU) disclosed herein, a downlink interference signal may be leaked from a downlink path to an uplink path in the RAU. In this regard, an adjustment circuit is provided in the downlink path of the RAU to suppress the downlink interference signal. A control system is provided in the DAS to monitor the leaked downlink interference signal and control the adjustment circuit in the RAU to minimize the leaked downlink interference signal in the uplink path. By providing the adjustment circuit in the RAU and the control system in the DAS to minimize the leaked downlink interference signal in the uplink path, it is possible to reduce interferences between downlink and uplink communications signals without increasing costs of the RAU.

Claims18

Dependent claims

A wireless communication system, comprising:

a plurality of remote units located on multiple floors of an infrastructure, each remote unit configured to receive optical communications signals and having at least one antenna;
a head-end equipment (HEE) communicatively coupled to the plurality of remote units over at least one downlink optical communications medium and at least one uplink optical communications medium;
wherein at least one remote unit among the plurality of remote units comprises a coupling device coupled to a downlink path configured to carry a downlink signal and an uplink path configured to carry an uplink signal, the coupling device configured to:
receive the downlink signal from the downlink path and provide the downlink signal to an antenna, wherein the downlink signal comprises at least one downlink communications signal and at least one downlink interference signal;
and
provide the uplink signal to the uplink path, wherein the uplink signal comprises an uplink communications signal received from the antenna and the at least one downlink interference signal leaked from the downlink path to the uplink path;
and
an interference control system communicatively coupled to the at least one remote unit among the plurality of remote units, the interference control system configured to:
provide the at least one downlink communications signal to the at least one remote unit over the at least one downlink optical communications medium;
receive the uplink signal from the at least one remote unit over the at least one uplink optical communications medium;
measure signal strength of the at least one downlink interference signal comprised in the uplink signal;
and
generate and provide an adjustment control signal to an adjustment circuit in the at least one remote unit to reduce the at least one downlink interference signal in the uplink signal.

10 more elements

A wireless communication system, comprising:

a plurality of remote units distributed throughout an infrastructure, each remote unit configured to receive optical communications signals and having at least one antenna;
and
a head-end equipment (HEE) communicatively coupled to the remote units and comprising:
a signal generator coupled to at least one of the remote units over at least one downlink optical communications medium, the signal generator configured to generate and distribute at least one downlink communications signal to a downlink path in the at least one remoute unit over the at least one downlink optical communications medium;
and
a spectrum analyzer coupled to the at least one remote unit over at least one uplink optical communications medium, the spectrum analyzer configured to:
receive an uplink signal from an uplink path in the at least one remote unit over the at least one uplink optical communications medium, wherein the uplink signal comprises at least one downlink interference signal leaked from the downlink path to the uplink path in the at least one remote unit;
measure signal strength of the at least one downlink interference signal comprised in the uplink signal;
and
provide the measured signal strength of the at least one downlink interference signal to a process controller that is communicatively coupled to the spectrum analyzer and the signal generator;
and
wherein the process controller is configured to provide an adjustment control signal to the at least one remote to minimize the at least one downlink interference signal in the uplink signal based at least in part on the measured signal strength of the at least one downlink interference signal.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/425,389Filed 6 Feb 2017 · continuation
Priority: 31 Jul 2015
Published: US 2017/0034833 A125 May 2017
Granted: 1 May 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04B 10/25753
Optical arrangements for wireless networks: distribution optical network, e.g. between a base station and a plurality of remote units
H04W 72/21
Control channels or signalling for resource management: in the uplink direction of a wireless link, i.e. towards the network
H04W 72/541
Based on quality criteria: using the level of interference
H04W 88/085
Access point devices: access point devices with remote components

Family

Application14/815,138Parent of this continuation · filed 31 Jul 2015
US 2017/0149504 A1Pre-grant publication · published 25 May 2017
US 9,603,155 B2Parent of this continuation
US 2017/0034833 A1Published application
US 9,960,850 B2This patent

From the US filing history. Foreign family members aren’t listed.