US20140192849A1 - System, a device and a method for adjusting output power in a distributed amplifier system - Google Patents

System, a device and a method for adjusting output power in a distributed amplifier system Download PDF

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Publication number
US20140192849A1
US20140192849A1 US14/149,832 US201414149832A US2014192849A1 US 20140192849 A1 US20140192849 A1 US 20140192849A1 US 201414149832 A US201414149832 A US 201414149832A US 2014192849 A1 US2014192849 A1 US 2014192849A1
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Prior art keywords
signals
controller
predetermined threshold
downlink signal
source
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Abandoned
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US14/149,832
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English (en)
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Scott Terry
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WHOOP WIRELESS LLC
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ZONE ACCESS TECHNOLOGIES Inc
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Priority to US14/149,832 priority Critical patent/US20140192849A1/en
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Publication of US20140192849A1 publication Critical patent/US20140192849A1/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • the present disclosure relates to a telecommunication system, and more particularly, but not exclusively to a system, a device and a method for adjusting signal output power in a distributed amplifier system.
  • DAS distributed amplifier system
  • the DAS system when the DAS system is located very close to the communications network source signal such as a cellular tower, a power of a communication device can be so low that it may result in degraded performance or a dropped call.
  • the DAS In order to protect the communications network, the DAS will lower the output power to where the noise is below the noise floor of the communications system. Unfortunately, lowering the output power of the DAS amplifier will lower the output power for communication signals that are going to different communication systems from different network providers, therefore reducing the effectiveness of the DAS for the wireless devices using a variety of communication networks. Therefore, a system and method for improving adjusting of signal output power across sub-bands may be needed.
  • a system comprises a first device and a second device.
  • the first device comprises a receiver, a spectrum analyzer, a controller, an amplifier, a filter, and a transmitter.
  • the first device receives, from at least one antenna, a plurality of signals from different sources.
  • a first device comprises a receiver, a spectrum analyzer, a controller and a transmitter.
  • the receiver receives, from at least one antenna, a plurality of signals from different sources.
  • the spectrum analyzer is communicatively coupled to the receiver and determines whether a downlink signal power from each of the sources to the system exceeds a predetermined threshold.
  • the controller is communicatively coupled to the spectrum analyzer and generates an indication indicating lowering gains on signals from at least one source with a downlink signal power larger than a predetermined threshold.
  • the amplifier is communicatively coupled to the controller and lowers gains of the amplifier according to the indication from the controller.
  • the transmitter transmits the plurality of signals after adjustment to at least one second device distributed within a site.
  • a method comprises receiving, from at least one antenna, a plurality of signals from different sources; determining whether a downlink signal power from each of the sources to the system exceeds a predetermined threshold; lowering gains on signals from at least one source with a downlink signal power larger than the predetermined threshold; transmitting the plurality of signals after adjustment to a plurality of second devices distributed within a site.
  • a system comprises a plurality of first devices and a second device.
  • the first devices are distributed in a site each comprising a first transmitter configured to transmit at least one signal to a second device.
  • the second device comprises a receiver, a spectrum analyzer, a controller, an amplifier and a transmitter.
  • the receiver receives a plurality of signals from the plurality of first devices.
  • the spectrum analyzer determines whether a downlink signal power from a source to the system exceeds a predetermined threshold.
  • the controller is communicatively coupled to the spectrum analyzer and generates an indication indicating lowering gains on signals from the first device to the second device when a downlink signal power from the source to the system exceeds a predetermined threshold.
  • the amplifier is communicatively coupled to the controller and lowers gains of the amplifier according to the indication from the controller.
  • the transmitter configured to transmit the plurality of signals after adjustment to the source.
  • FIG. 1A is a diagram illustrating a deployment of distributed amplifier system.
  • FIG. 1B is a block diagram illustrating a detailed embodiment of the distributed amplifier system.
  • FIG. 2 is a diagram illustrating a block diagram of a different embodiment of the distributed amplifier system.
  • FIG. 3 is a block diagram illustrating a different embodiment of a first device of FIGS. 1A and 1B .
  • FIG. 1A is a diagram illustrating a deployment of a distributed amplifier system 10 A.
  • the cellular signals from outdoor cellular towers may not provide clear and consistent coverage inside buildings, so wireless operators and building owners use distributed antenna systems 10 A to broadcast cellular signals throughout their sites.
  • the cellular signals are for illustration, and it may also include Wi-Fi signals, satellite signals, and other communication signals.
  • the communications signals are distributed throughout building interiors, campus environments, and outdoor areas using an active Distributed Amplifier System (DAS).
  • DAS Distributed Amplifier System
  • the DAS is active because it uses signal amplifiers to add gain to communications radio frequency (RF) signals. This gain also facilitates penetration of the signals throughout a building, campus environment, or outdoor areas despite physical obstructions such as walls, interior structures, poles, and trees without loss of signal integrity.
  • RF radio frequency
  • the distributed amplifier system 10 A comprises a head end 100 , a plurality of coverage nodes 150 and roof mounted antenna(s) 180 .
  • the distributed amplifier systems 10 A work by distributing wireless signals throughout an interior space: the signal is typically brought to the building using roof-mounted antennas 180 or with a base station (BTS) installed in a telecommunications equipment room.
  • the antennas 180 or BTS is then connected to the DAS using coaxial cabling or other wired or wireless connection mechanism.
  • the DAS network of coverage nodes 150 is placed strategically throughout the building using cable or other connection mechanism.
  • the DAS works with multiple coverage nodes 150 strategically placed within the building to provide reliable text messaging, data, and voice communications. All coverage nodes 150 in the system may be networked together to deliver a balanced and reliable signal throughout the site.
  • the head end unit 100 manages all of the coverage nodes 150 in the DAS system along with local and remote access for monitoring and status checking. Alternatively, management may be distributed across the network.
  • the DAS system can be installed in any site, which may include tunnels, fields, sports stadiums, subway or railway stations, buses, airports, or subways, etc. in additional to the building shown in FIG. 1A .
  • the modem 108 is a communication device that talks to all of the remote nodes including but not limited to modems 154 .
  • the spectrum analyzer 110 is communicatively coupled to the sub-band limiting unit 102 and analyzes spectrum of the signals outputted by the sub-band limiting unit 102 .
  • the calibration information unit 112 is communicatively coupled to the spectrum analyzer 110 and collects calibration information from the spectrum analyzer 110 .
  • the calibration info unit 112 is the place where all of the calibration information for all nodes and the head end are stored. This calibration information is used by the characterization unit 114 to determine if the environment has changed.
  • sub-band limiting unit 102 While only one sub-band limiting unit 102 is shown in the first device 100 , in an embodiment of the invention, there are multiple sub-band limiting units 102 to filter signals in different sub-bands.
  • FIG. 2 is a diagram illustrating a detailed embodiment 10 C of the distributed amplifier system 10 A shown in FIG. 1A .
  • the distributed amplifier system 10 C shows units or modules pertinent to the embodiment.
  • the system 10 C comprises a first device 100 A and at least one second devices 150 .
  • the first device 100 A comprises a receiver 200 , a spectrum analyzer 110 , a controller 210 , an amplifier 106 and a transmitter 220 .
  • the first device 100 A may be implemented by the head end 100 shown in FIGS. 1A and 1B .
  • the second devices 150 shown in FIG. 2 are substantially the same as the second devices 150 shown in FIGS. 1A and 1B .
  • the interconnect 230 may include, for example, a system bus, a form of Peripheral Component Interconnect (PCI) bus, a HyperTransport or industry standard architecture (ISA) bus, a small computer system interface (SCSI) bus, a universal serial bus (USB), IIC (I2C) bus, a CAN-bus (Controller Area Network), or an Institute of Electrical and Electronics Engineers (IEEE) standard 1394 bus, also called “Firewire”, and/or any other suitable form of physical or virtual connection, either wired or wireless.
  • PCI Peripheral Component Interconnect
  • ISA HyperTransport or industry standard architecture
  • SCSI small computer system interface
  • USB universal serial bus
  • I2C IIC
  • CAN-bus Controller Area Network
  • IEEE Institute of Electrical and Electronics Engineers
  • the controller 210 is communicatively coupled to both the spectrum analyzer 110 and an amplifier 106 and configured to generate a first indication indicating lowering gains of the amplifier 106 on signals from at least one source with downlink signal power larger than the predetermined threshold.
  • the amplifier 106 adjusts gains according to the first indication from the controller 210 . In other words, the gains of signals on the sub-band from the source nearer to the DAS system are lowered compared to the other signals on other sub-band across the band.
  • the filters are configured so that each of the different radio frequency (RF) sub-band may be handled independently.
  • the distributed amplifier system When the distributed amplifier system is closer to the tower, not as much signal gain is required as what is needed for a tower farther away. Since the distributed amplifier system is closer to that tower, it doesn't need a strong signal. The communication quality for a signal with a lower signal strength will not deteriorate when the DAS system is closer to the source.
  • the gain on the sub-bands used by the nearby towers are lowered thus lowering the noise on this sub-band, while still providing high gain on the sub-bands used by far away towers.
  • the effectiveness of the DAS system for the wireless devices using a variety of communication networks can be improved.
  • the first indication further comprises lowering output power of the signals from at least one source with downlink signal power larger than the predetermined threshold such that noises of the plurality of signals after adjustment are below a predetermined noise floor.
  • the predetermined noise floor may be ⁇ 100 dBm.
  • the transmitter 220 transmits the plurality of signals after adjustment to at least one of the second devices 150 distributed within a site.
  • the controller 210 may further generate a second indication indicating increasing gains on signals from at least one source with downlink signal power smaller than or equal to the predetermined threshold. In other words, the output power of an amplifier for signal from a farther source will be increased.
  • the filter 300 may include a radio frequency (RF) filter configured to lower output power of the signals from the at least one source with downlink signal power larger than the predetermined threshold.
  • the filter 300 may include a synthesizer configured to lower output power of the signals from the at least one source with downlink signal power larger than the predetermined threshold.
  • the filter 300 may comprise a digital signal processing (DSP) unit configured to lower output power of the signals from the at least one source with downlink signal power larger than the predetermined threshold.
  • DSP digital signal processing
  • the receiver 200 , the controller 210 , the filter 300 , the amplifier 106 and the spectrum analyzer 110 , and the transmitter 220 are connected in serial.
  • the filter 400 may change the signal to make it more flat, and the output of this filter 400 may feed into the transmitter 220 and the spectrum analyzer 110 .
  • the filter 300 will alter what the spectrum analyzer 110 , the amplifier 106 and the transmitter 220 will get.
  • FIG. 4 is a flow chart illustrating an embodiment of a method 40 .
  • the method 40 comprises receiving (in block 410 ), from at least one antenna, a plurality of signals from different sources, determining (in block 420 ) whether a downlink signal power from each of the sources to the system exceeds a predetermined threshold; lowering (in block 430 ) gains on signals from at least one source with a downlink signal power larger than the predetermined threshold; transmitting (in block 440 ) the plurality of signals after adjustment to at least one second devices distributed within a site.
  • FIG. 5 is a diagram illustrating another embodiment 100 of the distributed system 10 A operating for uplink transmission.
  • the distributed amplifier system 100 comprises a plurality of second devices 150 and a first device 100 A.
  • the plurality of second devices 150 are distributed in a site.
  • Each second device 150 comprises a first transmitter 500 that transmits at least one signal to the first device 100 A.
  • the first device 100 A comprises a receiver 510 , a spectrum analyzer 110 , a controller 210 , an amplifier 106 , and a second transmitter 520 .
  • the receiver 510 receives a plurality of signals from the plurality of second devices 150 .
  • the spectrum analyzer 110 is communicatively coupled to the receiver 510 and determines whether a downlink signal power from a source to the system exceeds a predetermined threshold.
  • the controller 210 is communicatively coupled to the spectrum analyzer 110 and generates an indication indicating lowering gains on output power of signals from the second device 500 to the first device 100 A when a downlink signal power from the source to the system exceeds a predetermined threshold.
  • the amplifier then lowers the output power of the received signals according to the indication from the controller 210 .
  • the second transmitter 520 transmits the plurality of signals after adjustment to the source.
  • the downlink signal which is used by the spectrum analyzer 110 are different from the uplink signals received by the receiver 510 from the second device 150 , adjusted by the amplifier and then transmitted by the second transmitter 520 .
  • noise refers to the noise emitted into the cellular network from an amplifier system.
  • Noise is emitted because any amplifier system amplifies the wanted cellular signal together with the noise contained in the air at the input antenna. The more gain an amplifier system has, the more noise it emits.
  • gains are reduced for uplink signal to nearer the cellular towers. Therefore, lowering the output power on an amplifier for signal to a nearer source will not affect the output power for communication signals that are going to different communication systems from different network providers.
  • the gain on the sub-bands used by the nearby towers are lowered thus lowering the noise on this sub-band, while still providing high gain on the sub-bands used by far away towers. As a result, the effectiveness of the DAS system for the wireless devices using a variety of communication networks can be improved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Amplifiers (AREA)
  • Radio Relay Systems (AREA)
US14/149,832 2013-01-08 2014-01-08 System, a device and a method for adjusting output power in a distributed amplifier system Abandoned US20140192849A1 (en)

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US201361749922P 2013-01-08 2013-01-08
US14/149,832 US20140192849A1 (en) 2013-01-08 2014-01-08 System, a device and a method for adjusting output power in a distributed amplifier system

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US14/149,824 Expired - Fee Related US9832739B2 (en) 2013-01-08 2014-01-08 System and method for calibration of a distributed amplifier system
US14/149,832 Abandoned US20140192849A1 (en) 2013-01-08 2014-01-08 System, a device and a method for adjusting output power in a distributed amplifier system
US14/149,830 Expired - Fee Related US9526075B2 (en) 2013-01-08 2014-01-08 System, a device and a method for adjusting signal strength in a distributed amplifier system
US15/348,982 Abandoned US20170099639A1 (en) 2013-01-08 2016-11-11 System, a device and a method for adjusting signal strength in a distributed amplifier system

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US15/348,982 Abandoned US20170099639A1 (en) 2013-01-08 2016-11-11 System, a device and a method for adjusting signal strength in a distributed amplifier system

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EP (2) EP2944157B1 (de)
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US9526075B2 (en) 2016-12-20
EP2944157B1 (de) 2016-08-24
WO2014110059A1 (en) 2014-07-17
US20140194135A1 (en) 2014-07-10
US20140192911A1 (en) 2014-07-10
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WO2014110060A1 (en) 2014-07-17

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