EP0950326A2 - Station et systeme de radiocommunications - Google Patents

Station et systeme de radiocommunications

Info

Publication number
EP0950326A2
EP0950326A2 EP97947850A EP97947850A EP0950326A2 EP 0950326 A2 EP0950326 A2 EP 0950326A2 EP 97947850 A EP97947850 A EP 97947850A EP 97947850 A EP97947850 A EP 97947850A EP 0950326 A2 EP0950326 A2 EP 0950326A2
Authority
EP
European Patent Office
Prior art keywords
communications
wireless communications
plural
base unit
networks
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97947850A
Other languages
German (de)
English (en)
Other versions
EP0950326A4 (fr
Inventor
Allan Farber
Dmitri Petrov
Howard Loboda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corning Optical Communications Wireless Ltd
Original Assignee
Corning Optical Communications Wireless Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IL11983296A external-priority patent/IL119832A/xx
Application filed by Corning Optical Communications Wireless Ltd filed Critical Corning Optical Communications Wireless Ltd
Publication of EP0950326A2 publication Critical patent/EP0950326A2/fr
Publication of EP0950326A4 publication Critical patent/EP0950326A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Definitions

  • Cellular radio was conceived to provide high capacity mobile communications without requiring large amounts of spectrum.
  • the original concept as proposed by AT&T involves the use of a frequency band within a region known as a cell and reusing the same frequency band in other adjacent cells with manageable interference between cells.
  • the capacity of a cellular radio network increases as the number of cells increases with decreasing cell size
  • the small cells are known as microcells.
  • Optical fibers have been used to feed the RF signal to microcells. Optical fiber can be run inside buildings, train stations, malls, etc. to improve coverage in a wireless communications system
  • United States Patent 5,457,357 describes a number of details of a fiber optic microcellular radio system.
  • Present day wireless communications systems may be divided into a number of groups. These include cellular telephone networks, cordless telephones, wide area data networks, wireless local area networks, paging/messaging and satellite mobile systems Each wireless communications system has its own frequency band and modulation scheme as well as its own geographic location in which the system is deployed Some of these systems may become obsolete while others may evolve into future personal communication systems. Nevertheless, it appears that two or more wireless systems will commonly be found in any location.
  • each wireless communications system has its own network for improved coverage in buildings and other shadowed areas A building which requires improved coverage for more than one wireless service must be "wired" separately for each service
  • the present invention seeks to provide an improved distributed antenna network for microcells.
  • the present invention further seeks to provide a single optical fiber network which is used simultaneously for a number of wireless communications systems
  • a wireless communications station comprising a base unit including a communications interface for communicating with plural wireless communications networks; a received communications combiner for combining received communications signals received from the plural wireless communications networks into a single radio frequency output; a transmit communications splitter for splitting previously combined transmit communications signals to be transmitted to the plural wireless communications networks into plural radio frequency outputs; at least one fiberoptic transmitter receiving the single radio frequency output and providing a corresponding optical output; and at least one fiberoptic receiver receiving an optical input and providing an RF output containing previously combined transmit communications signals; a plurality of remote units, each including: plural antennas for communicating with communicators along plural wireless communications networks; a received communications splitter for splitting previously combined received communications signals from the base unit and supplying them to the plural antennas; a transmit communications combiner for combining transmit communications signals from the plural antennas into a combined radio frequency output; a fiberoptic transmitter receiving the combined radio frequency output and providing a corresponding optical output; and a fiberoptic receiver receiving an optical input and
  • each remote unit also comprises a diplexer or other isolation apparatus interposed between each of the plural antennas and the combiner and the splitter, so as to enable simultaneous two way communications via each antenna at different frequencies for transmission and reception.
  • the plural wireless communications networks include at least two communications networks selected from the group consisting of cellular telephone networks, cordless telephones, wide area data networks, wireless local area networks, personal communications systems, personal communications networks, paging/messaging networks and satellite mobile systems.
  • a low frequency control signal is multiplexed by the communications interface onto the fiber network for providing loop back alarm status of each remote unit and to provide control signals thereto, which control amplifier gain thereof.
  • the plural antennas include at last one swivel mounted directional antenna whose direction may be adjusted on site.
  • the base unit also includes tuning circuitry which permits dynamic tuning and transmission/reception balance of cell size of each of the remote units.
  • the base unit may also include a network management interface which allows monitoring of the operational status of a base unit and the remote units connected thereto.
  • the fiberoptic transmitter employs a vertical cavity surface emitting laser or an edge emitting laser coupled to a single or multi mode fiber.
  • the edge emitting laser may be a distributed feedback laser integrated with an optical isolator.
  • a microcellular telecommunications system employing a fiber network including optical fibers which may be single or multi mode and optical transmitters for transmitting signals along the optical fibers, the optical transmitters comprising a vertical cavity surface emitting laser.
  • Fig. 1 is a simplified pictorial illustration of part of a wireless communications station, constructed and operative in accordance with a preferred embodiment of the present invention
  • Fig. 2 is a simplified block diagram illustration of circuitry employed in the apparatus of Fig. 1;
  • Fig. 3 is a somewhat more detailed block diagram illustration of part of the circuitry of Fig. 2;
  • Fig. 4 is a simplified block diagram illustration of a soft limiter, constructed and operative in accordance with a preferred embodiment of the present invention.
  • Fig. 5 A is a simplified block diagram of part of the circuitry of Fig. 2, in accordance with a preferred embodiment of the present invention;
  • Fig. 5B is a simplified block diagram of part of the circuitry of Fig. 2, in accordance with another preferred embodiment of the present invention, and including microprocessor control of remote antenna units;
  • Fig. 5C is a simplified illustration of a remote control unit for remotely controlling control parameters of a local cell, in accordance with a preferred embodiment of the present invention;
  • Fig. 6 is a simplified block diagram illustration of network management apparatus useful in the apparatus of Figs. 1 - 5B; and Fig. 7 is an illustration of the use of directional antennas in a system of the type illustrated in Figs. 1 - 6.
  • Figs. 1 and 2 illustrate a multi-system station which forms part of a wireless communications system constructed and operative in accordance with a preferred embodiment of the present invention.
  • a plurality of wireless network services such as PCS, GSM and other wireless telephone and radio services as well as paging services, each communicate via an appropriate antenna (not shown) with one or more multi-system stations such as that illustrated in Fig. 1.
  • Each station may be a building, part of a building or a plurality of buildings, depending upon system requirements.
  • each station comprises a base unit 10 which communicates with each of the required wireless network services, typically via wide bandwidth RF interface wired links which provide, typically a GSM input, a GSM output, a PCS input, a PCS output and a paging input. It is appreciated that any other suitable systems may also be connected to the base unit 10.
  • the base unit 10 preferably comprises an input combiner 12, which combines the various wireless inputs, such as the GSM, PCS and paging inputs into a combined output, typically in the form of a multiplexed signal, and provides the multiplexed signal via respective fiberoptic transmitters 14 and fiberoptic cables 16 to a plurality of remote units 20, which are typically distributed on different floors, or even in different rooms of one or more buildings or any indoor or shadowed areas, depending on the building construction and system requirements.
  • an input combiner 12 which combines the various wireless inputs, such as the GSM, PCS and paging inputs into a combined output, typically in the form of a multiplexed signal, and provides the multiplexed signal via respective fiberoptic transmitters 14 and fiberoptic cables 16 to a plurality of remote units 20, which are typically distributed on different floors, or even in different rooms of one or more buildings or any indoor or shadowed areas, depending on the building construction and system requirements.
  • Each remote unit 20 typically comprises a fiberoptic receiver 22 which receives the combined output, which is typically an RF output, and supplies it to a splitter 24 which is connected to individual antennas, such as antennas 30, 28 and 26 for PCS, GSM and paging networks respectively.
  • antennas 30, 28 and 30 preferably has at least one external antenna connection.
  • the splitter divides the combined output into individual output signals, such as, for example, PCS, GSM and paging signals which are sent to respective antennas 30, 28 and 26.
  • Antennas 26, 28 and 30 transmit signals received via combiner 12, transmitters 14, optical fibers 16, receivers 22, and splitters 24 to subscriber units such as cellular telephones 32 and pagers 34 (Fig. 1).
  • antennas 26, 28 and 30 preferably operate in a full duplex mode and also receive signals from subscriber units such as cellular telephones 32 operating on one or more networks, such as, for example, GSM and PCS networks.
  • These signals are supplied to a combiner 42 which combines the various wireless signal inputs, such as the GSM and PCS signals, into a combined output, typically in the form of a multiplexed signal, and provides the multiplexed signal via a fiberoptic transmitter 44 and a fiberoptic cable 46 to base unit 10.
  • Base unit 10 typically comprises a plurality of fiberoptic receivers 48, each corresponding to one of remote units 20, which receive the combined signal over fiberoptic cable 46 and supply it to an output splitter 50, which splits the combined signal into a plurality of individual signal outputs, such as, for example, a GSM output and a PCS output.
  • an output splitter 50 which splits the combined signal into a plurality of individual signal outputs, such as, for example, a GSM output and a PCS output.
  • Fig. 3 illustrates the circuitry of the base unit
  • the fiber optics transmitter typically comprises a laser diode 60.
  • the transmitter 14 employs a vertical cavity surface emitting laser or an edge emitting laser coupled to a single or multi-mode fiber 16.
  • each fiberoptic receiver 48 comprises a photodiode 62 which converts the optical signal to RF.
  • a 10 KHz detector 64 detects and filters out a 10 KHz tone. If the 10 KHz tone is not detected, this is an indication of a break in the communications link and detector 64 causes illumination of a pilot LED 66. Another indication of a break in the communications link is the absence of received light, which may be indicated by an optical alarm 68.
  • Fig. 4 illustrates a soft limiter 100, constructed and operative in accordance with a preferred embodiment of the present invention.
  • Soft limiter 100 may be used at the uplink to prevent laser diode 60 from being overdriven, and thereby prevent non-linear distortion in all of the services distributed.
  • soft limiter 100 protects any of the wireless services from inadvertently increasing input power to base unit 10.
  • Soft limiter 100 preferably includes a switched attenuator 102, a comparator
  • Fig. 5A is a block diagram of part of the circuitry of Fig. 2.
  • jumpers may be used to connect the GSM antenna 28 and the PCS antenna 30 to local and/or remote antennas.
  • a jumper 70 may be used to connect GSM antenna 28 solely to an internal antenna 72.
  • An additional jumper 72 may be used to connect GSM antenna 28 to a local antenna 76, which is preferably the same internal antenna 72, and to a remote antenna 78.
  • Remote antenna 78 preferably is DC powered to allow for amplification and may be connected by coax.
  • Local antenna 76 and remote antenna 78 are preferably connected via a power divider/combiner 80.
  • the foregoing description applies equally for PCS antenna 30, as shown in Fig. 5 A.
  • each GSM antenna 28 and PCS antenna 30 are each input to a low noise amplifier (LNA) 82 via an antenna duplexer 84 in order to enable the same antenna to be used for transmission and reception.
  • LNA low noise amplifier
  • the signals from both the GSM antenna 28 and PCS antenna 30 are combined by combiner 42 and input to fiberoptic transmitter 44.
  • the optical signal from base unit 10 is amplified and demultiplexed by a demultiplexer 85.
  • a demultiplexer 85 Preferably three signals are demultiplexed.
  • a 10 KHz tone is input to transmitter 44
  • a low frequency paging signal is input to paging loop antenna 26
  • an RF signal comprising combined GSM and PCS signals, is input to a demultiplexer 86.
  • These signals are each input to their respective antenna via antenna duplexer 84.
  • a gain control is provided at receiver 22 and transmitter 44. The gain level is controlled by the amplitude of the 10 KHz pilot tone.
  • the simultaneous gain control of the transmitted and received signals determines the size of the local cell.
  • a low frequency data signal may be multiplexed by a multiplexer 90 along with the RF signal.
  • a microprocessor 92 at each remote unit 20 receives the signal. The absence of the signal indicates an alarm status which microprocessor 92 relays to a microprocessor (not shown) at base unit 10.
  • the low frequency data signal may be used for status and control of remote unit 20, and may include the following control parameters: a. Cell size: This controls gains of the transmitted and received signals b. Balance between transmitted and received signals c. Threshold of soft limiter 100.
  • Control parameters may be from base unit 10 or remotely controlled through a network management interface. However, it is sometimes more convenient to set these control parameters locally while the unit is tested in situ.
  • Remote control unit 110 preferably includes a plurality of control buttons, such as a cell size control button 112 and a balance control button 114.
  • control button 112 may control volume
  • control button 114 may control transmit cell balance, such as stereo balance.
  • An additional control button 116 may be provided for controlling threshold of soft limiter 100.
  • the network management apparatus typically comprises a microprocessor 200 which communicates typically via an RS 232 interface 202 and a modem 204 with an external communications network such as an ordinary telephone network.
  • the microprocessor receives status indications from alarm indicators 206 which indicate malfunctions in remote units 20 (Fig. 1) based on receipt of loop back signals therefrom.
  • Microprocessor 200 provides gain control signals to the remote units via a D/A converter 208 and a loop back signal generator 210. Loop back signal generator 210 preferably operates at approximately 10 KHz.
  • FIG. 7 which is an illustration of the use of directional antennas in a system of the type illustrated in Figs. 1 - 6.
  • Fig. 7 shows the use of two such antennas, indicated by reference numerals 220 and 222, which are aimed in different directions. Directionality is achieved by rotating the ground plane around the vertical antenna.
  • Antennas 28 and 30 (Fig. 2) are preferably antennas of this type. This allows for tuning and balancing of cell size once the basic fixed installations have been made. This further allows for future tuning and balancing to overcome obstacles or partitions which may be constructed in the building in the future.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

La présente invention concerne une station de radiocommunications comprenant une unité de base faite de plusieurs éléments. Une interface de communication assure des communications avec plusieurs réseaux de radio communication. Un coupleur émission combine en un seul signal de sortie HF les signaux de communication reçus d'une pluralité de réseaux de radiocommunication. Un coupleur récepteur sépare les signaux de communication préalablement combinés émission de façon à les transmettre à la pluralité de réseaux de radiocommunication en une pluralité de signaux de sortie HF. Un émetteur fibre optique reçoit le signal de sortie HF et fournit un signal de sortie HF correspondant. Un récepteur fibre optique reçoit une entrée optique et fournit un signal de sortie HF véhiculant des signaux de communication préalablement combinés émission. Une pluralité d'unités à distance, comprenant chacune une pluralité d'antennes, assure les communications avec des communicateurs d'une pluralité de réseaux de radiocommunications. Un coupleur récepteur sépare les signaux de communication reçus de l'unité de base et les fournit à la pluralité d'antennes. Un coupleur émission combine en un signal de sortie HF combiné les signaux de communication émis par la pluralité d'antennes. Un émetteur fibre optique reçoit le signal de sortie HF combiné et fournit un signal de sortie optique correspondant. Un récepteur fibre optique reçoit une entrée optique et fournit une sortie HF au coupleur recepteur contenant les signaux de communication émission préalablement reçus. Une première fibre optique connecte chacun des émetteurs fibre optique à l'unité de base à un récepteur fibre optique correspondant dans une unité à distance correspondante. Une seconde fibre optique connecte chaque émetteur fibre optique d'une unité à distance à un récepteur fibre optique correspondant de l'unité de base.
EP97947850A 1996-12-15 1997-12-15 Station et systeme de radiocommunications Withdrawn EP0950326A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
IL11983296 1996-12-15
IL11983296A IL119832A (en) 1996-12-15 1996-12-15 Wireless communications systems employing optical fibers
US886695 1997-07-01
US08/886,695 US5969837A (en) 1996-12-15 1997-07-01 Communications system
PCT/IL1997/000411 WO1998027748A2 (fr) 1996-12-15 1997-12-15 Station et systeme de radiocommunications

Publications (2)

Publication Number Publication Date
EP0950326A2 true EP0950326A2 (fr) 1999-10-20
EP0950326A4 EP0950326A4 (fr) 2002-03-13

Family

ID=26323334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97947850A Withdrawn EP0950326A4 (fr) 1996-12-15 1997-12-15 Station et systeme de radiocommunications

Country Status (6)

Country Link
EP (1) EP0950326A4 (fr)
JP (1) JP2001506826A (fr)
AU (1) AU735820B2 (fr)
BR (1) BR9713714A (fr)
CA (1) CA2275251A1 (fr)
WO (1) WO1998027748A2 (fr)

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US6480510B1 (en) 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
GB9923070D0 (en) 1999-09-29 1999-12-01 Nokia Telecommunications Oy Multilayer telecommunications network
US6842459B1 (en) 2000-04-19 2005-01-11 Serconet Ltd. Network combining wired and non-wired segments
EP1346513B1 (fr) 2000-08-30 2010-10-20 Tmt Coaxial Networks Inc. Procede et systeme de reseau a domicile
US8724485B2 (en) 2000-08-30 2014-05-13 Broadcom Corporation Home network system and method
US9094226B2 (en) 2000-08-30 2015-07-28 Broadcom Corporation Home network system and method
IT1403065B1 (it) 2010-12-01 2013-10-04 Andrew Wireless Systems Gmbh Distributed antenna system for mimo signals.
GB0229238D0 (en) * 2002-12-13 2003-01-22 Univ London An optical communication system
IL154921A (en) 2003-03-13 2011-02-28 Mosaid Technologies Inc A telephone system that includes many separate sources and accessories for it
IL157787A (en) 2003-09-07 2010-12-30 Mosaid Technologies Inc Modular outlet for data communications network
DE10344278B4 (de) * 2003-09-24 2013-10-31 Nokia Siemens Networks Gmbh & Co. Kg Vorrichtung für eine Funkstation, welche mehrere Funkstandards unterstützt
IL159838A0 (en) 2004-01-13 2004-06-20 Yehuda Binder Information device
JP4448955B2 (ja) 2004-03-29 2010-04-14 ユーティーシダカントンシュンユーシァンゴンシ マルチモード無線ネットワークにおけるリソース管理方法およびトラフィック誘導方法
FR2868634A1 (fr) * 2004-04-02 2005-10-07 Evolium Sas Soc Par Actions Si Transmission centralisee de flux de donnees provenant de sources radio de technologies differentes, par multiplexage temporel
US7697522B2 (en) 2006-11-20 2010-04-13 Broadcom Corporation Systems and methods for aggregation of packets for transmission through a communications network
US7782850B2 (en) 2006-11-20 2010-08-24 Broadcom Corporation MAC to PHY interface apparatus and methods for transmission of packets through a communications network
US8345553B2 (en) 2007-05-31 2013-01-01 Broadcom Corporation Apparatus and methods for reduction of transmission delay in a communication network
US9112717B2 (en) 2008-07-31 2015-08-18 Broadcom Corporation Systems and methods for providing a MoCA power management strategy
AU2010210771B2 (en) * 2009-02-03 2015-09-17 Corning Cable Systems Llc Optical fiber-based distributed antenna systems, components, and related methods for calibration thereof
US8553547B2 (en) 2009-03-30 2013-10-08 Broadcom Corporation Systems and methods for retransmitting packets over a network of communication channels
US20100254278A1 (en) 2009-04-07 2010-10-07 Broadcom Corporation Assessment in an information network
US8867355B2 (en) 2009-07-14 2014-10-21 Broadcom Corporation MoCA multicast handling
US8942250B2 (en) 2009-10-07 2015-01-27 Broadcom Corporation Systems and methods for providing service (“SRV”) node selection
US8611327B2 (en) 2010-02-22 2013-12-17 Broadcom Corporation Method and apparatus for policing a QoS flow in a MoCA 2.0 network
US8514860B2 (en) 2010-02-23 2013-08-20 Broadcom Corporation Systems and methods for implementing a high throughput mode for a MoCA device
EP3506521A1 (fr) 2010-10-01 2019-07-03 CommScope Technologies LLC Système d'antenne distribué pour signaux mimo

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US5400419A (en) * 1992-12-03 1995-03-21 Siemens Aktiengesellschaft Bidirectional optical transmission and reception module
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Also Published As

Publication number Publication date
EP0950326A4 (fr) 2002-03-13
AU735820B2 (en) 2001-07-19
BR9713714A (pt) 2000-06-13
AU5408298A (en) 1998-07-15
WO1998027748A2 (fr) 1998-06-25
CA2275251A1 (fr) 1998-06-25
JP2001506826A (ja) 2001-05-22
WO1998027748A3 (fr) 1998-09-17

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