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WO2001052580A2 - Procede et systeme de selection d'un emplacement d'antenne optimal - Google Patents

Procede et systeme de selection d'un emplacement d'antenne optimal Download PDF

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Publication number
WO2001052580A2
WO2001052580A2 PCT/SE2001/000056 SE0100056W WO0152580A2 WO 2001052580 A2 WO2001052580 A2 WO 2001052580A2 SE 0100056 W SE0100056 W SE 0100056W WO 0152580 A2 WO0152580 A2 WO 0152580A2
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
base station
measured
signal strength
error rate
Prior art date
Application number
PCT/SE2001/000056
Other languages
English (en)
Other versions
WO2001052580A3 (fr
Inventor
Olof Erik Grimlund
Kjell Arne Ljungdahl
Jan Arie Van Houvelingen
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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 Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to AU2001228962A priority Critical patent/AU2001228962A1/en
Publication of WO2001052580A2 publication Critical patent/WO2001052580A2/fr
Publication of WO2001052580A3 publication Critical patent/WO2001052580A3/fr

Links

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
    • H04W16/18—Network planning tools
    • 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]

Definitions

  • This invention relates generally to a method and system for selecting an antenna location. More particularly, this invention relates to a method and system for selecting a location for an antenna for a fixed radio terminal in a telecommunication system.
  • Radio in the Local Loop cellular systems employing fixed cellular terminals, e.g., GSM/TDMA/WCDMA systems, satellite systems, and Wireless LAN systems.
  • RLL Radio in the Local Loop
  • the fixed terminals are installed quickly and in a manner such that later reinstallation will not be needed. It is also important that the terminals are installed with as low a path loss as possible to provide a good link budget and thereby minimize the number of base station sites required.
  • the optimal spot for mounting an antenna is found by making signal strength measurements of the received signal at various locations and selecting the location with the strongest received signal strength. These signal strength measurements are often made by the terminal.
  • a problem with this approach is that the terminals are typically not calibrated and may thus lead to inexact measurements. Assume, for example, that the terminals have a tolerance of ⁇ 4 dB in measured received signal strength as required, e.g., by the GSM specification. A margin of 4 dB has to be added to compensate for terminals reporting signal strengths higher or lower than the actual received signal strength. Then, if the actual received signal strength measured by a terminal to be installed is 4 dB too low, the indication from the terminal is 8 dB too low. Thus, the signal strength indicated by the terminal might be too low, though the location is acceptable. It might, therefore, be hard for the installer to find an acceptable location for installing the antenna.
  • Interference can be estimated by measuring the bit error rate (BER).
  • BER bit error rate
  • a problem with BER measurements is that they generally require a long period of time to perform, thus adding significantly to the installation time. For example, a 10 ⁇ 3 BER target with a 6 dB margin for seasonal change means that a BER below 10 "5 should be measured. It may take up to 10 hours to collect enough measurements to ensure that the BER is below 10 "5 .
  • this and other objects are met by a method and system for determining an optimal location for an antenna connected to a terminal.
  • An initial location for the antenna is selected, and a signal is exchanged between, e.g., a base station and the antenna at the selected location.
  • a signal strength of the signal is measured, and an interference level of the signal is estimated.
  • the terminal may be mounted indoors or outdoors.
  • the antenna may be mounted indoors, e.g., if the antenna is close to the base station, or outdoors.
  • the signal strength may be measured at the terminal.
  • the signal strength may be measured at the base station and reported to the terminal.
  • the estimation of the interference level may be performed by measuring an error rate of the signal at the terminal or the base station.
  • the signal may be attenuated by decreasing the output power from the base station or from the terminal.
  • FIGS. 1 A and IB illustrate exemplary fixed radio communication systems according to the present invention.
  • FIG. 2 illustrates a method according to exemplary embodiments.
  • signal strength and signal interference are considered in determining where to install an antenna for a fixed terminal.
  • the signal strength and the signal interference may by derived from several measurements averaged together or from a maximum measured value.
  • FIG. 1 A illustrates a communication system with a fixed radio terminal, e.g., a fixed cellular terminal (FCT) 100, mounted indoors and an antenna unit 200 mounted outdoors.
  • the FCT 100 receives signals from and transmits signals over an air interface 25 to, e.g., a base station 50, via the antenna unit 200.
  • the FCT 100 may be connected to a telephone 500.
  • the FCT 100 includes radio parts, digital parts and other parts, e.g., a power supply.
  • the FCT 100 may include a data adaptor 105 for fax and data to facilitate communication with a personal computer 400 via a modem 300.
  • the FCT 100 is connected to the antenna unit 200 via, e.g., a coaxial cable.
  • the antenna unit 200 may, instead, be mounted indoors, e.g., if the terminal is placed close to the base station.
  • FIG. IB illustrates an exemplary communication system according to another aspect of the invention.
  • the radio parts are located outdoors.
  • Other devices e.g., a data adaptor (FDA) 160 and a power supply (PS) 170, 180 may be located indoors to facilitate installation and replacement.
  • received signal strength may be measured at the fixed terminal or at the antenna.
  • external calibrated measurement equipment can be used, e.g., equipment connected to the external antenna.
  • the terminal can be calibrated, e.g., in the factory, or hardware/software can be added in the terminal so that the terminal measures with higher accuracy.
  • the signal strength may be measured by measuring the received signal strength in a signal transmitted from the radio terminal to the base station.
  • the transmitted signal from the terminal has a relatively high accuracy, e.g., ⁇ 1 dB, thus affording an accurate measurement.
  • the measurement equipment in the base station can be calibrated with a low relative increase in cost.
  • the measured signal strength can be reported by the base station to the terminal, e.g., as a short message service (SMS) message.
  • SMS short message service
  • a BER measurement may be made at the terminal.
  • the BER measurement may be made at the base station, and the result of the measurement may be sent to the terminal, e.g., as an SMS message.
  • the terminal may transmit a known bit pattern to the base station, the base station may receive and re-transmit the pattern back to the terminal, and the terminal may then measure the BER in the received re-transmitted pattern.
  • the BER measurement can be made faster by attenuating the received signal. Assume for example, that the target BER for an acceptable amount of interference is 10 "5 (including margin). If the received signal is attenuated by 6 dB, the BER target of 10 "5 translates into a target of about 10 "3 .
  • Attenuation may be achieved by reducing the output power at the base station, if the BER measurement is made at the terminal, or by reducing the power of the terminal, if the BER measurement is made at the base station or if the BER measurement is made at the terminal using a re-transmitted pattern received from the base station.
  • attenuation may be achieved using the downlink power control mechanism in which the radio terminal reports a measured signal strength to the base station which uses the reported measured signal strength to control the downlink output power. If the radio terminal purposely reports too high a measured signal strength during the measurement period, the base station responds by reducing the downlink output power, thus attenuating the signal received by the terminal.
  • the terminal determines whether the selected location for the antenna is acceptable. This determination may be made, e.g., by a microprocessor in the terminal. For example, if the measured signal strength is within a predetermined range, and the BER is less than a predetermined target, the location is determined to be acceptable.
  • the range for the measured signal strength depends, e.g., on the technology, environment, and the distance from the base station. For a GSM terminal, an example of an acceptable measured signal strength range may be -80 dBm to -90 dBm.
  • FIG. 2 illustrates a method for selecting a location for mounting an antenna according to an exemplary embodiment.
  • the method begins at step 200 at which an initial location of an antenna is selected based, e.g., on the direction of the base station.
  • a signal is exchanged between the base station and the antenna at the selected location.
  • a signal strength of the signal is measured. The signal strength may be measured, at the terminal or may be measured at the base station and reported to the terminal.
  • an interference level of the signal is estimated based, e.g., on BER measurements made at the terminal or made at the base station and reported to the terminal.
  • a determination is made whether the selected location is acceptable, based on the measured signal strength and the estimated interference level. If the location is not acceptable, the process starts again, and another location is selected. If the location is acceptable, the antenna and terminal are mounted at step 250.
  • a location for mounting an antenna for a fixed radio terminal is selected based on measured signal strength and estimated interference level. According to exemplary embodiments, the selection of the location is made easily, quickly and accurately, leading to a low average line cost.

Landscapes

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

Abstract

Dans un système de télécommunications utilisant au moins un terminal radio fixe et au moins une station de base, on détermine un emplacement acceptable pour une antenne. On choisit l'emplacement de l'antenne et un signal est échangé entre la station de base et l'antenne au niveau de l'emplacement choisi. On mesure l'intensité du signal et on évalue son niveau d'interférence. Puis on détermine si l'emplacement choisi est acceptable en fonction de l'intensité du signal mesurée et du niveau d'interférence estimé.
PCT/SE2001/000056 2000-01-14 2001-01-12 Procede et systeme de selection d'un emplacement d'antenne optimal WO2001052580A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001228962A AU2001228962A1 (en) 2000-01-14 2001-01-12 Method and system for selecting an optimal antenna location

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48330300A 2000-01-14 2000-01-14
US09/483,303 2000-01-14

Publications (2)

Publication Number Publication Date
WO2001052580A2 true WO2001052580A2 (fr) 2001-07-19
WO2001052580A3 WO2001052580A3 (fr) 2002-01-24

Family

ID=23919534

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/000056 WO2001052580A2 (fr) 2000-01-14 2001-01-12 Procede et systeme de selection d'un emplacement d'antenne optimal

Country Status (4)

Country Link
AR (1) AR026827A1 (fr)
AU (1) AU2001228962A1 (fr)
UY (1) UY26531A1 (fr)
WO (1) WO2001052580A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380898A (en) * 2001-10-09 2003-04-16 Motorola Inc Arrangement for location registration in more than one communication network
GB2447439A (en) * 2007-02-02 2008-09-17 Ubiquisys Ltd Controlling maximum total transmit power of a base station to minimise interference
US8463281B2 (en) 2009-08-11 2013-06-11 Ubiquisys Limited Power setting

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5463673A (en) * 1993-04-29 1995-10-31 Northern Telecom Limited In-building radio deployment technique for wireless personal communications systems
EP0696151A3 (fr) * 1994-08-05 1999-02-17 Ascom Business Systems Ag Dispositif pour déterminer l'emplacement d'une station de base
GB9525110D0 (en) * 1995-12-08 1996-02-07 Northern Telecom Ltd An antenna assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380898A (en) * 2001-10-09 2003-04-16 Motorola Inc Arrangement for location registration in more than one communication network
GB2380898B (en) * 2001-10-09 2004-01-14 Motorola Inc Communication network location register and subscriber device
GB2447439A (en) * 2007-02-02 2008-09-17 Ubiquisys Ltd Controlling maximum total transmit power of a base station to minimise interference
US8032142B2 (en) 2007-02-02 2011-10-04 Ubiquisys Limited Access point power control
GB2447439B (en) * 2007-02-02 2012-01-25 Ubiquisys Ltd Access point power control
US8463281B2 (en) 2009-08-11 2013-06-11 Ubiquisys Limited Power setting

Also Published As

Publication number Publication date
WO2001052580A3 (fr) 2002-01-24
AR026827A1 (es) 2003-02-26
AU2001228962A1 (en) 2001-07-24
UY26531A1 (es) 2001-03-16

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