WO2000007389A1 - Lignes d'abonnes sans fil a antennes polarisees horizontalement - Google Patents

Lignes d'abonnes sans fil a antennes polarisees horizontalement Download PDF

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Publication number
WO2000007389A1
WO2000007389A1 PCT/US1999/012893 US9912893W WO0007389A1 WO 2000007389 A1 WO2000007389 A1 WO 2000007389A1 US 9912893 W US9912893 W US 9912893W WO 0007389 A1 WO0007389 A1 WO 0007389A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
rfp
wfau
wll
telephone
Prior art date
Application number
PCT/US1999/012893
Other languages
English (en)
Inventor
Zygmond Turski
Original Assignee
Ericsson, Inc.
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
Application filed by Ericsson, Inc. filed Critical Ericsson, Inc.
Priority to CA002336636A priority Critical patent/CA2336636A1/fr
Priority to EP99927358A priority patent/EP1101370A1/fr
Priority to AU44286/99A priority patent/AU4428699A/en
Priority to BR9912657-5A priority patent/BR9912657A/pt
Publication of WO2000007389A1 publication Critical patent/WO2000007389A1/fr
Priority to NO20010506A priority patent/NO20010506L/no

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system

Definitions

  • This invention relates to telecommunications systems and methods, and more particularly to wireless local loops for telephone communications systems and methods.
  • Wireless Local Loops are widely used in telecommunications systems.
  • a wireless local loop uses a radio to provide a telephone connection to or within a building such as a dwelling.
  • a dwelling is connected to a switching office via a local loop, then through a distribution node and a trunked cable that is connected to the switching office.
  • the local loop is copper cable buried in the ground or carried on overhead pylons to the dwelling, and the trunked cable includes multiple copper pairs.
  • WLL replaces the local loop section with a radio path rather than a copper cable. Accordingly, WLL replaces the connection from the distribution point to the dwelling with a radio path. All other parts of the network may be left unaffected.
  • the distribution point is connected to a radio transmitter, referred to herein as a Radio Fixed Part (RFP), that includes an RFP antenna that is responsive to a switching office to wirelessly transmit telecommunications messages from the switching office and to wirelessly receive telecommunications messages for the switching office via the RFP antenna.
  • RFP Radio Fixed Part
  • a Wireless Fixed Access Unit (WFAU) including a WFAU antenna is conventionally mounted on the side of the dwelling and is connected to a telephone using a network interface and customer interface to wirelessly transmit telecommunications messages from the telephone to the RFP and to wirelessly receive telecommunications messages for the telephone from the RFP via the WFAU antenna. Accordingly, apart from the WFAU on the side of the dwelling, the telephone subscriber need not notice any difference between a wireless local loop and a conventional wired local loop.
  • WLL is used in many telecommunications systems that do not already have conventional wired local loops. Moreover, for those telecommunications systems that already have wired local loops, WLL is being used by new operators to provide competition to an existing telephone company.
  • WLLs do not employ separate radio technologies but rather use an existing radio technology in an existing radio frequency band.
  • technologies include cordless technologies such as the Digital European Cordless Telephone (DECT), PHS which is a Japanese standard for use in the 1895-1918 MHz frequency band, and CT-2, which was developed in the United Kingdom as an alternative to analog cordless home phones.
  • DECT Digital European Cordless Telephone
  • PHS which is a Japanese standard for use in the 1895-1918 MHz frequency band
  • CT-2 which was developed in the United Kingdom as an alternative to analog cordless home phones.
  • Cellular technologies may also be used, including analog cellular systems, such as Analog Mobile Phone System (AMPS) and the Total Access Communications Systems (TACS), and digital cellular systems including GSM, IS-95 and D-AMPS.
  • AMPS Analog Mobile Phone System
  • TACS Total Access Communications Systems
  • WLL systems are present in the same geographic area as cellular, satellite and/or other wireless communications systems and generally use existing technologies, it may be difficult to avoid interference between the WLL telecommunications messages and existing cellular, satellite and/or other wireless communications messages. Interference may be reduced somewhat by intelligent frequency allocation of the WLL wireless transmissions. However, this frequency allocation may be difficult to perform in view of the many other wireless radiotelephone communications systems that already may be present. Moreover, the frequency allocation may need to be updated as additional cellular/satellite and/or other radiotelephone communications systems become operational or change.
  • the wireless local loop includes horizontally polarized antennas.
  • interference between cellular, satellite and/or other radiotelephone communications systems, which employ predominantly vertically polarized antennas can be reduced and preferably minimized.
  • the invention stems from the realization that conventional cellular and satellite radiotelephone systems use vertically polarized transmissions due to the vertical nature of the orientation of the mobile antennas on vehicles and/or mobile radiotelephones.
  • vertically polarized transmissions due to the vertical nature of the orientation of the mobile antennas on vehicles and/or mobile radiotelephones.
  • wireless local loop with its fixed wireless telecommunications, there is no need to use vertically oriented antennas.
  • wireless local loops include a Radio Fixed Part (RFP) including an RFP antenna that is responsive to a switching office, to wirelessly transmit telecommunications messages from the switching office and to wirelessly receive telecommunications messages for the switching office via the RFP antenna.
  • the wireless local loop also includes a Radio Fixed Part (RFP) including an RFP antenna that is responsive to a switching office, to wirelessly transmit telecommunications messages from the switching office and to wirelessly receive telecommunications messages for the switching office via the RFP antenna.
  • the wireless local loop also includes a Radio Fixed Part (RFP) including an RFP antenna that is responsive to a switching office, to wirelessly transmit telecommunications messages from the switching office and to wirelessly receive telecommunications messages for the switching office via the RFP antenna.
  • the wireless local loop also includes a Radio Fixed Part (RFP)
  • WFAU Wireless Fixed Access Unit
  • the RFP antenna and the WFAU antenna are primarily non-vertically polarized.
  • the RFP antenna is a horizontally polarized RFP antenna and the WFAU antenna is a horizontally polarized WFAU antenna.
  • the RFP antenna may be fixedly mounted to a telephone pole or pylon in an orientation that provides primarily non-vertical polarization.
  • the RFP antenna may be fixedly mounted to a cellular radiotelephone base station in an orientation that provides primarily non-vertical polarization.
  • the WFAU antenna is fixedly mounted to a building such as a dwelling in an orientation that provides primarily non-vertical polarization.
  • Wireless local loops may also include a network interface and a customer interface that connect the WFAU to the telephone.
  • the telecommunications messages may utilize cordless, cellular and/or other wireless technologies. Accordingly, primarily non-vertically polarized radio frequency telecommunications messages are transmitted between the RFP and the WFAU. Preferably, horizontally polarized radio frequency telecommunications messages are transmitted between the RFP and the WFAU. Cross-polarization interference with cellular, satellite and/or other radiotelephone communications system can thereby be reduced.
  • Figure 1 is a block diagram of telecommunications systems including first embodiments of WLL systems and methods according to the present invention.
  • Figure 2 is a block diagram of telecommunications systems including second embodiments of WLL systems and methods according to the present invention.
  • Figure 3 graphically illustrates typical response of a vertically polarized antenna to a vertically polarized wave and to a horizontally polarized wave.
  • the telecommunications system includes a wired telephone system 102 and a wireless radiotelephone system 104.
  • Wired telephone system 102 includes a switching office 106 that is connected to the Public Switched Telephone Network (PSTN) 108 and/or other networks 112, such as satellite or cellular radiotelephone communications networks.
  • PSTN Public Switched Telephone Network
  • Trunked cables 114 connect the switching office 106 to a plurality of telephone poles or pylons 116.
  • a wired local loop 118 connects selected ones of the pylons 116 to selected buildings such as dwellings 122.
  • the wired local loop 118 connects to the dwelling via a network interface 124 and a customer interface 126 that may include a standard RJ-11 connector.
  • a telephone 128 is connected to the customer interface 126.
  • telephone 128 is illustrated as being a wired telephone, a mobile or cordless telephone may also be used.
  • a wireless local loop 130 is used to connect a trunked cable 114 to a second selected dwelling 122'.
  • the wireless local loop 130 includes a Radio Fixed Part (RFP) 132 that includes an RFP antenna 134 that is responsive to the switching office 106 to wirelessly transmit telecommunications messages from the switching office 106 and to wirelessly receive telecommunications messages for the switching office 106.
  • the WLL also includes a Wireless Fixed Access Unit (WFAU) 136 that includes a WFAU antenna 138 that is responsive to a telephone 128' to wirelessly transmit telecommunications messages 140 from the telephone 128' to the RFP 132, and to wirelessly receive telecommunications messages 140 for the telephone 128 from the RFP 132 via the WFAU antenna 138.
  • WFAU Wireless Fixed Access Unit
  • telephone 128' has been designated with a "prime (')” notation, from the customer perspective, it can operate in the same manner as a conventional telephone 128, and includes a conventional network interface 124 and customer interface 126 between the WFAU
  • telephone 128' can be a wired or wireless telephone.
  • the RFP antenna 134 and the WFAU antenna 138 are primarily non-vertically polarized.
  • primarily non-vertically polarized it is meant that the antenna has a greater horizontally polarized component than a vertically polarized component.
  • the term “primarily non- vertically polarized” includes linearly polarized antennas that have a greater horizontal linear polarization than vertical linear polarization, but excludes circularly polarized antennas that have equal vertical and horizontal polarization components.
  • polarization refers to the direction of the electric (E) field vector.
  • Vertical polarization refers to an E field vector that is perpendicular to the earth's surface and horizontal polarization refers to an E field vector parallel to the earth's surface.
  • a primarily non-vertically polarized radio frequency telecommunications message may also be regarded as a radio frequency telecommunication message having an ellipticity that is less than 1, where ellipticity is defined as the ratio of the vertical and horizontal E field component. Preferably, the ellipticity is, or approaches 0.
  • the coupling between a vertically polarized antenna such as is commonly used for a mobile communications, for example in the Personal Communications System (PCS) band (1850 MHz- 1990 MHz) may be reduced to -15 dB or more, where cross- polarization refers to the difference in antenna gain to a vertical and horizontal illumination.
  • PCS Personal Communications System
  • RFP antenna 134 and WFAU antenna 138 are a horizontally polarized RFP antenna 134 and a horizontally polarized WFAU antenna 138, so that the rejection of vertically polarized radio frequencies may be maximized.
  • a cellular radiotelephone system 104 including a Mobile Telephone Switching Office (MTSO) 142 and a plurality of base stations 144 and portable radiotelephones 146 and mobile radiotelephones 148 exist in the same geographic area as the WLL 130
  • the vertically polarized radiotelephone communications between the base stations 144, the portable radiotelephones 146 and the mobile radiotelephones 148 will preferably minimally interfere with the primarily non-vertically polarized WLL 130. Accordingly, improved performance in the WLL may be obtained and reduced interference in the existing radiotelephone system 104 may be obtained.
  • the RFP 132 is preferably fixedly mounted to a telephone pole or pylon 116 in an orientation that provides primarily non- vertical polarization. More preferably, as shown in Figure 1, the RFP antenna 134 is fixedly horizontally mounted to the telephone pole or pylon 116. Similarly, the WLL 136 is preferably fixedly mounted to the dwelling 122' in an orientation that provides primarily non- vertical polarization. More preferably, as shown in Figure 1, the
  • WFAU antenna is preferably fixedly horizontally mounted to the dwelling 122'.
  • the telecommunication messages 140 may utilize cordless or cellular wireless technologies and/or other technologies, the details of which need not be described herein.
  • the RFP 132 may also be referred to as a "fixed part", a "base station”, or a "radio port”.
  • the WFAU may also be referred to as a "portable part", a “Cordless Terminal Adapter (CTA)", a “Fixed Access Unit (FAU)” or a "Wireless Access Fixed Unit (WAFU)”.
  • the WLL may also be referred to as a "Radio Local Loop (RLL)".
  • FIG. 2 a telephone communications system including second embodiments of WLL systems and methods according to the invention will now be described.
  • the embodiment of Figure 2 differs from that of Figure 1 in that the RFP 132' is mounted on a cellular radiotelephone base station 144' rather than being mounted on a telephone pole or pylon 116.
  • the RFP 132' and the RFP antenna 134' are mounted on a radiotelephone base stations 144', interference between the RFP antenna 134' and a monopole antenna 152 or a patch antenna 154 of the cellular radiotelephone communications system may be severe due to their close proximity.
  • the RFP antenna 134' according to the present invention is primarily non-vertically polarized, this interference can be reduced and preferably minimized.
  • Figure 3 illustrates a typical radiation pattern of a patch antenna that may be used for the RFP antenna 132 and/or the WFAU antenna 138.
  • the higher gain represents a vertically positioned antenna's response to a vertically polarized wave.
  • the lower gain is a response to a horizontally polarized wave.
  • the ratio of the outer loop to the inner loop indicates the cross- polarization of the antenna.
  • the cross-polarization is -28 dB, while along the 30 degree azimuth, the cross polarization is -15 dB. Accordingly, proper antenna selection, positioning and alignment to provide non- vertically polarized transmissions and preferably to provide horizontally polarized transmissions, can reduce and preferably minimize cross-polarization, thereby allowing a maximum rejection of an undesired signal.
  • radio links need not be degraded, while allowing a significant reduction in coupling to surrounding interferers and hence allowing reduction in the interference in the WLL system.
  • the cross-polarization reduction can reduce such interference as well.
  • WLL may operate in the PCS frequency band of 1850 MHz-1990 MHz.
  • WLL may need to coexist with other, much more powerful wireless, cellular and/or PCS systems, often having to share the cellular base station tower.
  • WLL RFPs and WFAUs may be radiated upon with high intensity uncoordinated RF power that can lead to a rise in interference and increase the probability of call blocking.
  • potential interference can be reduced and preferably minimized.
  • the present invention may be used in combination with other interference-reducing techniques.
  • FDD Frequency Division Duplex
  • a WLL Frequency Division Duplex
  • the present invention may be added to WLL systems that use FDD mode to provide further reduction in interference with non- WLL systems.
  • Modern WLL systems may employ miniature base stations that accommodate small duplexers, typically constructed of high dielectric materials and capable of approximately 30 dB of isolation. The present invention can increase this isolation without the need to detrimentally affect other important parameters.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Radio Relay Systems (AREA)
  • Details Of Aerials (AREA)

Abstract

Des lignes d'abonnés sans fil comprennent essentiellement des antennes polarisées non verticalement. De préférence, la ligne d'abonné sans fil comprend des antennes polarisées horizontalement. Par l'utilisation d'antennes polarisées essentiellement non verticalement dans la ligne d'abonné sans fil, on peut réduire et de préférence minimiser les interférences entre les systèmes de communication cellulaire, par satellite et/ou autre système téléphonique utilisant des antennes polarisées essentiellement verticalement. Les systèmes radiotéléphoniques classiques cellulaires et par satellite utilisent des transmissions polarisées verticalement du fait de la nature verticale de l'orientation des antennes mobiles sur des véhicules et/ou des radiotéléphones mobiles. Toutefois, dans une ligne d'abonné sans fil, avec ses télécommunications sans fil fixes, il n'est pas nécessaire d'utiliser des antennes orientées verticalement. Par conséquent, pour réduire les interférences, on utilise des antennes polarisées essentiellement non verticalement.
PCT/US1999/012893 1998-07-31 1999-06-08 Lignes d'abonnes sans fil a antennes polarisees horizontalement WO2000007389A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002336636A CA2336636A1 (fr) 1998-07-31 1999-06-08 Lignes d'abonnes sans fil a antennes polarisees horizontalement
EP99927358A EP1101370A1 (fr) 1998-07-31 1999-06-08 Lignes d'abonnes sans fil a antennes polarisees horizontalement
AU44286/99A AU4428699A (en) 1998-07-31 1999-06-08 Wireless local loops including horizontally polarized antennas
BR9912657-5A BR9912657A (pt) 1998-07-31 1999-06-08 Laço local sem fio, processo de transmissão sem fio de mensagens de telecomunicações de radiofrequência, parte fixa de rádio, e, unidade de acesso fixa sem fio
NO20010506A NO20010506L (no) 1998-07-31 2001-01-30 TrÕdløse lokale sløyfer innbefattende horisontalpolariserte antenner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12688798A 1998-07-31 1998-07-31
US09/126,887 1998-07-31

Publications (1)

Publication Number Publication Date
WO2000007389A1 true WO2000007389A1 (fr) 2000-02-10

Family

ID=22427205

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/012893 WO2000007389A1 (fr) 1998-07-31 1999-06-08 Lignes d'abonnes sans fil a antennes polarisees horizontalement

Country Status (9)

Country Link
EP (1) EP1101370A1 (fr)
AR (1) AR023324A1 (fr)
AU (1) AU4428699A (fr)
BR (1) BR9912657A (fr)
CA (1) CA2336636A1 (fr)
CO (1) CO5060450A1 (fr)
NO (1) NO20010506L (fr)
UY (1) UY25630A1 (fr)
WO (1) WO2000007389A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009002317A1 (fr) * 2007-06-27 2008-12-31 Thomson Licensing Appareil et procédé de commande d'un signal

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5444762A (en) * 1993-03-08 1995-08-22 Aircell, Inc. Method and apparatus for reducing interference among cellular telephone signals
WO1998011678A2 (fr) * 1996-09-13 1998-03-19 Aircell Incorporated Voie de commande pour poste mobile de telecommunication cellulaire non terrestre
EP0847209A2 (fr) * 1996-12-06 1998-06-10 Nortel Networks Corporation Système de communication multipoint fixe, sans fil, à fréquence ultra-haute
EP0851698A2 (fr) * 1996-12-23 1998-07-01 Texas Instruments Incorporated Systèmes de communication sans fil
WO1998033338A2 (fr) * 1997-01-29 1998-07-30 Telefonaktiebolaget Lm Ericsson (Publ) Systeme d'acces radio point a multipoint

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5444762A (en) * 1993-03-08 1995-08-22 Aircell, Inc. Method and apparatus for reducing interference among cellular telephone signals
WO1998011678A2 (fr) * 1996-09-13 1998-03-19 Aircell Incorporated Voie de commande pour poste mobile de telecommunication cellulaire non terrestre
EP0847209A2 (fr) * 1996-12-06 1998-06-10 Nortel Networks Corporation Système de communication multipoint fixe, sans fil, à fréquence ultra-haute
EP0851698A2 (fr) * 1996-12-23 1998-07-01 Texas Instruments Incorporated Systèmes de communication sans fil
WO1998033338A2 (fr) * 1997-01-29 1998-07-30 Telefonaktiebolaget Lm Ericsson (Publ) Systeme d'acces radio point a multipoint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009002317A1 (fr) * 2007-06-27 2008-12-31 Thomson Licensing Appareil et procédé de commande d'un signal

Also Published As

Publication number Publication date
AR023324A1 (es) 2002-09-04
AU4428699A (en) 2000-02-21
EP1101370A1 (fr) 2001-05-23
NO20010506D0 (no) 2001-01-30
UY25630A1 (es) 1999-11-17
BR9912657A (pt) 2001-05-02
CA2336636A1 (fr) 2000-02-10
NO20010506L (no) 2001-01-30
CO5060450A1 (es) 2001-07-30

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