WO2002027970A1 - Orientation de faisceau dans un systeme de communication cellulaire - Google Patents

Orientation de faisceau dans un systeme de communication cellulaire Download PDF

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Publication number
WO2002027970A1
WO2002027970A1 PCT/EP2001/011300 EP0111300W WO0227970A1 WO 2002027970 A1 WO2002027970 A1 WO 2002027970A1 EP 0111300 W EP0111300 W EP 0111300W WO 0227970 A1 WO0227970 A1 WO 0227970A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
mobile terminal
data
mobile
downlink
Prior art date
Application number
PCT/EP2001/011300
Other languages
English (en)
Inventor
Stephen Wales
Original Assignee
Roke Manor Research Limited
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 Roke Manor Research Limited filed Critical Roke Manor Research Limited
Priority to EP01969798A priority Critical patent/EP1320947A1/fr
Publication of WO2002027970A1 publication Critical patent/WO2002027970A1/fr

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Classifications

    • 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
    • H04W16/28—Cell structures using beam steering

Definitions

  • This invention relates to cellular communication systems, such as mobile telephone systems, and it relates in particular to such systems conforming to UTRA specifications.
  • Such systems are basically short-range cordless telephony systems, based upon the notional overlaying of a geographic area, representing the system's coverage limits, with a more-or-less regular tessellation of spatial cells, each served by at least one base station which primarily communicates with mobile terminals in its cell, but also communicates with base stations and mobile terminals in adjoining cells to perform various house-keeping activities, such as providing hand-over functions which allow mobiles to move freely from cell to cell.
  • the demands placed upon such systems are continually increasing, in terns not only of the number of mobiles to be supported, but also of the amounts of data traffic handled per mobile. These latter demands arise at least in part because of major increases in downlink traffic (i.e. data passed from base stations to mobiles) as access to major information centres and databases grows wider. Increased downlink traffic not only presents straightforward capacity problems; it also gives rise to data handling problems associated with the asymmetry between uplink and downlink traffic.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • a cellular communications system comprising a plurality of base stations serving respective system cells, each base station being capable of communicating with a plurality of mobile terminals within its cell and with at least some mobile terminals in adjacent system cells; wherein data are beamed from a base station to a mobile terminal in its cell, and wherein transmission of comparative data received by a mobile terminal from its serving base station and at least one other base station are communicated to the serving base station and utilised therein to adaptively influence at least the direction of transmission of said beam.
  • the downlink beam can be directed accurately at the intended mobile terminal, and the risk of interference, whether from a third party station or terminal into the downlink beam or from the downlink beam into a third party station or terminal, is substantially reduced.
  • the said comparative data include time difference signals relating to the time of arrival, at the mobile terminal, of signals from different base stations. This is advantageous, since these signals are already utilised within existing systems to enable the location of the mobile terminal to be calculated.
  • the comparative data may also include signal strength and interference measurements which, again, are in current use for hand- over purposes.
  • the invention also encompasses a base station for a cellular communications system; the station being capable, in response to its receipt of data indicative of the position of a mobile terminal, of adaptively directing its transmitter beam at the mobile terminal, to enable the mobile terminal to resist the reception of interfering data from other base stations or mobile terminals.
  • Figure 2 shows, schematically, the occurrence of inter-cell interference
  • Figure 3 shows, in block diagrammatic form, a cellular communications system in accordance with one embodiment of the invention.
  • a cell 1 of a cellular communications system is served by a base station 2.
  • the base station 2 primarily transmits down-link data to, and receives up-link data from, a plurality of mobile terminals in its cell.
  • two mobile terminals 3 and 4 are shown by way of example only, and the intention is that each mobile terminal can communicate independently with the base station 2 over respective paths 232 and 242.
  • downlink data intended for mobile terminal 3 can interfere with data being received by mobile terminal 4, and vice versa, as well as for uplink data from one of the mobile terminals to interfere with up-link data from the other.
  • the down-link interference is the more acute difficulty however, because as mentioned above, downlink data volumes tend to be significantly higher than on the up-link, and of course the power transmitted by the base station significantly exceeds that emitted from the mobile terminals.
  • intra-cell interference can occur between the base station 1 serving cell 1 and a mobile terminal 5 in an adjacent cell 6 served by another base station 7.
  • both intra-cell and inter-cell interference can be influenced by a number of factors, among which are the transmission characteristics of the geographic area in which the cells are located, the duplexing system used and other operational criteria, such as the occurrence of widely differing asymmetries in up- and down-link data as between different users of the system. In any event, however, such interference problems are exacerbated by accepting increased user number capacities.
  • This invention seeks to address the problem of capacity-induced interference by incorporating into the system the concept of smart antennas, i.e. antennas coupled to processors that are capable, when provided with information about the location of a target mobile terminal, of adaptively focusing the transmission/reception beam associated with an antenna upon the target mobile terminal.
  • Increased user capacity is accommodated because the reduced susceptibility to interference of a properly directed beam allows greater use of the orthogonal code space (in both TDD and FDD modes) and (in the TDD mode) through reduced inter-cell interference.
  • Use of the invention also offers enhanced range capabilities, by exploiting beamforming gains.
  • the downlink beam should direct the energy at the mobile terminal, whilst minimising the transmission of energy in other directions which could potentially cause interference to other mobile terminals.
  • multi-path propagation may cause the optimum direction of arrival of energy at the mobile terminal to differ from the direction based on.purely geographic considerations.
  • the downlink beamwidth is compatible with the azimuthal spread of the uplink signals, however, the geographic criteria should suffice to direct the beam adequately. In practice it is unlikely that the array order will be sufficiently high that beamwidths are significantly less than the azimuthal spread.
  • One simple ad-hoc approach to estimating the direction of a mobile terminal is to form a number of receiving beams spanning, between them, the entire azimuthal extent of the base station's coverage.
  • the beam receiving the maximum signal to noise plus interference ratio could be identified, thus to form a crude estimate of the direction of that mobile terminal from the base station. This estimate will, however, be affected by interference conditions, and for example a strong interfering signal received in a sidelobe null could affect the estimation process.
  • mobile terminals are required, by operating protocols for the system, to perform a number of measurements for purposes such as location services and handover.
  • location services the time difference of arrival measurement between signals received from different base stations is reported to the serving base station, in order to allow the location of the mobile terminal to be connected.
  • signal strength and interference measurements are also reported to the serving base station, and all measurements are reported at regular intervals.
  • the measurements for location services are utilised at the base station to direct the downlink beam towards the mobile terminal. Angle information is calculated from the time difference of arrival measurements, knowing the locations of the two base stations in question.
  • the information can be combined, perhaps using data fusion techniques, to determine the desired direction and beamwidth of the downlink transmission.
  • the beamwidth can be related to the uncertainty in the direction estimate, such that, in the event of a large uncertainty in direction, a larger beamwidth is used. Changes in beamwidth are, where necessary, accompanied by adjustments in the power of the downlink transmissions to ensure that sufficient signal strength is received at the mobile terminal.
  • a base station 10 comprises a receiving means 11, including antenna and receiving circuit components as will be known to those skilled in the art.
  • the base station 10 also includes circuits 12 coupled to the circuit components of the receiving means 11 and capable of extracting, from the received data, the time of arrival measurements relating to a given mobile terminal 13.
  • the measurements extracted by circuits 12 are applied to a digital signal processor 14 which calculates, using known algorithms, the preferred azimuthal angle to be adopted by the transmitted beam 15 of the base station 10 for communication with the mobile terminal 13 and applies, to the downlink signals to be transmitted along the beam 15, appropriate phasing to orient the beam correctly.
  • the signal processor 14 may perform further operations upon the time of arrival measurements and/or it may be supplied with further information, such as direction information derived from the received uplink signals by means of a circuit 16.
  • This expedient may be particularly effective if delayed until the beam 15 has been properly aligned with the mobile terminal 13, thereby ensuring that the signal to noise ratio of received uplink data is substantially optimised before these data are used in the adaptive alignment and/or beam-shaping process.
  • the signal processor 14 may with advantage use data fusion techniques to combine the information applied thereto from the circuits 12 and 16.

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

Abstract

Les systèmes de communication cellulaire, tels que des systèmes de téléphonie cellulaire se conformant aux spécifications UTRA, font face à des demandes en augmentation, non seulement en ce qui concerne le nombre de téléphones cellulaires à prendre en charge, mais également en ce qui concerne les quantités de trafic de données acheminées pour chaque téléphone cellulaire. Ces demandes proviennent du moins en partie d'une augmentation importante dans le trafic de liaison descendante, alors que l'accès à des centres et des bases de données d'information principaux s'élargit. Ceci provoque non seulement des problèmes de capacité, mais également des problèmes d'acheminement de données en relation avec l'asymétrie entre le trafic de liaison ascendante et le trafic de liaison descendante. De plus, plus le nombre de téléphones cellulaires pris en charge par un système est grand, plus les difficultés de maintenir les interférences entre les cellules ou dans les cellules à des niveaux tolérables sont grandes. Cette invention concerne un système de communication cellulaire comprenant un certain nombre de stations de base desservant des cellules de système respectives. Chaque station de base est capable de communiquer avec de nombreux terminaux mobiles dans ses cellules et avec au moins quelques terminaux mobiles dans des cellules de système adjacentes. Selon le système de cette invention, les transmissions de données comparatives reçues par un terminal mobile de la station de base le desservant et d'au moins une autre station de base sont communiquées à la station de base le desservant, et sont utilisées pour influencer par ajustement au moins la direction de transmission du faisceau de liaison descendante. Ainsi, le faisceau de liaison descendante peut être dirigé avec précision au niveau du terminal mobile voulu, et le risque d'interférence, que ce soit d'une troisième station ou d'un troisième terminal dans le faisceau de liaison ascendante ou d'un faisceau de liaison ascendante dans une troisième station ou un troisième terminal, est sensiblement réduit.
PCT/EP2001/011300 2000-09-29 2001-09-28 Orientation de faisceau dans un systeme de communication cellulaire WO2002027970A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01969798A EP1320947A1 (fr) 2000-09-29 2001-09-28 Orientation de faisceau dans un systeme de communication cellulaire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0023855A GB2367455A (en) 2000-09-29 2000-09-29 Interference reduction in a cellular communication system having a beamed downlink
GB0023855.0 2000-09-29

Publications (1)

Publication Number Publication Date
WO2002027970A1 true WO2002027970A1 (fr) 2002-04-04

Family

ID=9900347

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/011300 WO2002027970A1 (fr) 2000-09-29 2001-09-28 Orientation de faisceau dans un systeme de communication cellulaire

Country Status (3)

Country Link
EP (1) EP1320947A1 (fr)
GB (1) GB2367455A (fr)
WO (1) WO2002027970A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101753191A (zh) * 2008-12-05 2010-06-23 大唐移动通信设备有限公司 协同多小区干扰抑制的方法、系统及装置
US11218909B2 (en) * 2017-11-16 2022-01-04 Nokia Solutions And Networks Oy Adaptive transmission direction selection in cellular network

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1507427A1 (fr) * 2003-08-11 2005-02-16 Alcatel Sélection de faisceau dans un système de télécommunication cellulaire sans fil
WO2008051625A2 (fr) 2006-10-24 2008-05-02 Cisco Technology, Inc. Formation de faisceau collaboratif de stations émettrices/réceptrices de base en vue de diminuer les interférences dans un réseau à cellules muliples sans fil
JP4877858B2 (ja) * 2007-06-01 2012-02-15 三菱電機株式会社 通信システム
US9078269B2 (en) 2007-09-21 2015-07-07 Qualcomm Incorporated Interference management utilizing HARQ interlaces
US9137806B2 (en) 2007-09-21 2015-09-15 Qualcomm Incorporated Interference management employing fractional time reuse
US9374791B2 (en) 2007-09-21 2016-06-21 Qualcomm Incorporated Interference management utilizing power and attenuation profiles
US8824979B2 (en) 2007-09-21 2014-09-02 Qualcomm Incorporated Interference management employing fractional frequency reuse
US9066306B2 (en) 2007-09-21 2015-06-23 Qualcomm Incorporated Interference management utilizing power control
US8948095B2 (en) 2007-11-27 2015-02-03 Qualcomm Incorporated Interference management in a wireless communication system using frequency selective transmission
US8837305B2 (en) 2007-11-27 2014-09-16 Qualcomm Incorporated Interference management in a wireless communication system using beam and null steering
JP2011505102A (ja) * 2007-11-27 2011-02-17 クゥアルコム・インコーポレイテッド ビームおよびヌルステアリングを使用したワイヤレス通信システムにおける干渉管理
US8611331B2 (en) 2009-02-27 2013-12-17 Qualcomm Incorporated Time division duplexing (TDD) configuration for access point base stations
US9065584B2 (en) 2010-09-29 2015-06-23 Qualcomm Incorporated Method and apparatus for adjusting rise-over-thermal threshold
GB2584891A (en) * 2019-06-20 2020-12-23 Stratospheric Platforms Ltd A fleet of high altitude platforms comprising antennas and method of positioning thereof

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Publication number Priority date Publication date Assignee Title
WO1998039945A1 (fr) * 1997-03-05 1998-09-11 Nokia Telecommunications Oy Procede pour selectionner un signal et systeme de radiocommunication cellulaire
FR2780817A1 (fr) * 1998-07-06 2000-01-07 Sfr Sa Procede d'orientation de faisceau(x) rayonnant(s) radioelectrique(s) pour la communication entre une station de base et un radiotelephone mobile, et station de base correspondante
WO2000051367A2 (fr) * 1999-02-26 2000-08-31 Telefonaktiebolaget Lm Ericsson (Publ) Attribution d'un faisceau d'antenne intelligente lors de l'etablissement d'une communication avec une station mobile

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GB2307142A (en) * 1995-11-08 1997-05-14 Motorola Ltd Steering an antenna in accordance with mobile location

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998039945A1 (fr) * 1997-03-05 1998-09-11 Nokia Telecommunications Oy Procede pour selectionner un signal et systeme de radiocommunication cellulaire
FR2780817A1 (fr) * 1998-07-06 2000-01-07 Sfr Sa Procede d'orientation de faisceau(x) rayonnant(s) radioelectrique(s) pour la communication entre une station de base et un radiotelephone mobile, et station de base correspondante
WO2000051367A2 (fr) * 1999-02-26 2000-08-31 Telefonaktiebolaget Lm Ericsson (Publ) Attribution d'un faisceau d'antenne intelligente lors de l'etablissement d'une communication avec une station mobile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101753191A (zh) * 2008-12-05 2010-06-23 大唐移动通信设备有限公司 协同多小区干扰抑制的方法、系统及装置
US11218909B2 (en) * 2017-11-16 2022-01-04 Nokia Solutions And Networks Oy Adaptive transmission direction selection in cellular network

Also Published As

Publication number Publication date
GB0023855D0 (en) 2000-11-15
EP1320947A1 (fr) 2003-06-25
GB2367455A (en) 2002-04-03

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