WO2000051364A2 - Procede d'acquisition de gain d'antenne dans un systeme cellulaire - Google Patents

Procede d'acquisition de gain d'antenne dans un systeme cellulaire Download PDF

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Publication number
WO2000051364A2
WO2000051364A2 PCT/SE2000/000176 SE0000176W WO0051364A2 WO 2000051364 A2 WO2000051364 A2 WO 2000051364A2 SE 0000176 W SE0000176 W SE 0000176W WO 0051364 A2 WO0051364 A2 WO 0051364A2
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WIPO (PCT)
Prior art keywords
antenna
base station
gain
mobile station
difference
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PCT/SE2000/000176
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English (en)
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WO2000051364A3 (fr
Inventor
Michel Desgagne
Sylvain Labonte
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Telefonaktiebolaget Lm Ericsson (Publ)
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Priority to CA002362899A priority Critical patent/CA2362899A1/fr
Priority to AU36850/00A priority patent/AU3685000A/en
Priority to BR0008542-1A priority patent/BR0008542A/pt
Publication of WO2000051364A2 publication Critical patent/WO2000051364A2/fr
Publication of WO2000051364A3 publication Critical patent/WO2000051364A3/fr

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    • 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
    • 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

Definitions

  • the present invention relates to a cellular communications system and, in particular, to a system utilizing smart antenna technology in cellular base stations.
  • a cell site 10 may comprise either one omnidirectional cell or a plurality, for example, three (or more), sector cells 12.
  • Directive antennas 14, each with an appropriately selected beamwidth for the sector cell 12, are then utilized at each base station 16 to form a plurality of wide beams 18, one per sector cell, with the totality of the beams formed thereby providing substantially omni-directional radio frequency coverage throughout the cell site area.
  • each of the formed wide beams 18 is in continuous use to provide service within each corresponding sector cell 12.
  • FIGURE 2A Another example of directive antenna use in cellular communications networks is based on the use of smart antenna technology, as is illustrated in FIGURE 2A.
  • Directive antennas 20 are utilized at each base station 16 of a cell site 10 to form a plurality of separate, perhaps slightly overlapping, narrow beams 22 within each sector cell 12, with the totality of the beams formed thereby providing substantially omnidirectional radio frequency coverage throughout the cell site area.
  • the narrow beams 22 are intermittently used only when necessary to provide service to one or more mobile stations 24, as is illustrated in FIGURE 2B.
  • the base station 16 controls its directive antenna 20 to activate at any given time only those individual ones of the plurality of separate, perhaps slightly overlapping, narrow beams 22 as are needed to serve active mobile stations 24 within the cell site 10.
  • a first set of transceivers for a base station in a given cell is connected to a first directive (sector) antenna that forms one beam per sector cell. Both traffic and control channel communications with mobile stations located within the given cell may be effectuated through the first directive antenna utilizing the continuously activated sector beams.
  • a second set of transceivers for that same base station in that same given cell is connected to a second directive (smart) antenna that forms a plurality of separate, perhaps slightly overlapping, narrow beams per sector cell.
  • traffic channel communications may be effectuated through the second directive antenna by activating a certain one of the plurality of narrow beams which points generally in the direction of each mobile station within the given cell.
  • the present invention still further concerns a method and apparatus for identifying and characterizing any difference in gain between the first directive (sector) antenna array and the second directive (smart) antenna array.
  • a mobile station located at a known azimuth orientation with respect to the base station makes downlink signal strength measurements with respect to both control channel communications from the base station broadcast using the first directive antenna and traffic channel communications from the base station broadcast using the second directive antenna.
  • the signal strength measurements are reported and then subtracted from each other (taking into account certain power offsets such as backoff and power control) to determine a value indicative of the difference in gain between the first and second directive antennas as a function of the azimuth orientation.
  • a mobile station during pre-handoff verification makes a downlnk received power measurement on control channel communications that are broadcast from the target base station using the first directive antenna.
  • the target base station determines the azimuth orientation with respect to the mobile station and makes an uplink received power measurement using its second directive antenna on the traffic channel communications of the mobile station.
  • These received power measurements are reported, along with information relating to the power level settings for mobile station traffic channel broadcast and base station control channel broadcast, and mathematically manipulated to determine a value indicative of the difference in gain between the first and second directive antennas as a function of the azimuth orientation.
  • a base station during pre-handoff verification determines the azimuth orientation with respect to the mobile station and makes an uplink signal strength measurement using its first and second directive antennas on the traffic channel communications of the mobile station. The signal strength measurements are reported and then subtracted from each other to determine a value indicative of the difference in gain between the first and second directive antennas as a function of the azimuth orientation.
  • FIGURE 1 is a diagram of directive antenna beam coverage within a sectorized cell of a cellular communications system
  • FIGURES 2A and 2B previously described, are diagrams of directive antenna beam coverage within a smart antenna equipped cell of a cellular communications system
  • FIGURES 3 A and 3B are diagrams of directive antenna beam coverage within a combined sectorized/smart antenna cell of the present invention.
  • FIGURE 4 is a block diagram of a cellular system including base stations implementing the combined sectorized/smart antenna cell illustrated in FIGURES 3A and 3B;
  • FIGURE 5 is a flow diagram for a first method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in
  • FIGURES 3A and 3B are identical to FIGURES 3A and 3B;
  • FIGURE 6 is a schematic diagram illustrating an operating scenario for a second method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3A and 3B
  • FIGURE 7 is a flow diagram for a second method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B and the scenario of FIGURE 6;
  • FIGURE 8 is a schematic diagram illustrating an operating scenario for a third method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B; and
  • FIGURE 9 is a flow diagram for a third method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B and the scenario of FIGURE 8.
  • FIGURE 3 A wherein there is shown a diagram of directive antenna beam coverage within a combined sectorized/smart antenna cell 100 of the present invention.
  • a base station 102 for the cell 100 includes a first directive (sector) antenna 104 operable to form a plurality of wide beams 106, one per sector 108, with the totality of the sector coverage formed thereby providing substantially omni-directional radio frequency coverage throughout the cell site area.
  • the base station 102 for the cell 100 further includes a second directive (smart) antenna 110 operable to form a plurality of separate, perhaps slightly overlapping, narrow beams 112 (either switched or steerable) within each sector 108, with the totality of the smart beams formed thereby providing substantially omni-directional radio frequency coverage throughout the cell site area.
  • a second directive antenna 110 operable to form a plurality of separate, perhaps slightly overlapping, narrow beams 112 (either switched or steerable) within each sector 108, with the totality of the smart beams formed thereby providing substantially omni-directional radio frequency coverage throughout the cell site area.
  • only one sector 108 is shown.
  • only one physical directive antenna comprising, for example, an antenna array
  • each of the wide beams 106 formed by the first directive antenna 104 is in continuous use to provide service within each corresponding sector 108 to mobile stations 114 present therein.
  • the second directive antenna 110 only those narrow beams 112 which are needed to serve active mobile stations 114 therein are in use at a given
  • FIGURES 3 A and 3B wherein there is further illustrated the differences in measured antenna gain between the beams 106 and 112 as a function of azimuth orientation. It may be seen in FIGURE 3B that at a certain azimuth orientation angle ( ⁇ ,) the gain of the first directive (sector) antenna 104 is equal to the gain of the second directive (smart) antenna 110. Conversely, at another angle ( ⁇ 2 ) shown in FIGURE 3 A the gain of the first directive antenna 104 differs quite significantly from the gain of the second directive antenna 110.
  • ⁇ azimuth orientation angle
  • FIGURE 4 a block diagram of a cellular system 120 including base stations 122 implementing the combined sectorized/smart antenna cell illustrated in FIGURES 3A and 3B.
  • Each base station 122 includes a plurality of transceivers (Tx/Rx) 124 which operate in either as digital or analog mode on a certain frequency assigned to the cell 100 where the base station is located.
  • a first set 124(1) of one or more of these transceivers 124 are connected to the first directive (sector) antenna 104 supporting the sector beams 106 (see, FIGURES 3 A and 3B).
  • a second set 124(2) of a plurality of these transceivers 124 are connected to the second directive (smart) antenna 110 supporting the smart antenna beams 112 (see, FIGURES 3 A and 3B).
  • Each base station 122 is connected to a mobile switching center (MSC) 126. This connection may be made either directly (as generally indicated at 128(1)) or through a base station controller (BSC) 130 (as generally indicated at 128(2)).
  • MSC mobile switching center
  • BSC base station controller
  • the base station 122 further includes a first location verification module (LVM1) 132 operable in connection with the first directive (sector) antenna 104 to make measurements on mobile station uplink communications.
  • the location verification module 132 is provided with an order to make these measurements. This order specifies a frequency on which the measurements are to made, a time slot within which the measurements are to be made, and a digital voice color code (DVCC) necessary to unambiguously identify the mobile station whose uplink communications are to be measured. Responsive to the received order, the location verification module 132 tunes to the proper frequency within the proper time slot, decodes the DVCC, and then makes the uplink measurements on certain metrics such as signal strength and signal quality. The measurements are then reported for subsequent evaluation in connection with system operation, such as, for example, handoff determinations.
  • LIM1 first location verification module operable in connection with the first directive (sector) antenna 104 to make measurements on mobile station uplink communications.
  • the location verification module 132 is provided with an order to make these measurements. This order
  • the base station 122 still further includes a second location verification module (LVM2) 134 operable in connection with the second directive (smart) antenna 110 to make measurements on mobile station uplink communications.
  • the location verification module 134 is similarly provided with an order to make these measurements. This order specifies a frequency on which the measurements are to made, a time slot within which the measurements are to be made, and a digital voice color code (DVCC) necessary to unambiguously identify the mobile station whose uplink communications are to be measured. Responsive to the received order, the location verification module 134 tunes to the proper frequency within the proper time slot, decodes the DVCC, and then makes the uplink measurements on certain metrics such as signal strength and signal quality.
  • DVCC digital voice color code
  • the measurements are then reported for subsequent evaluation in connection with system operation, such as, for example, handoff determinations.
  • the measurements may also be processed by the second location verification module 134 to determine a direction of arrival (DO A) azimuth orientation angle ⁇ (see, FIGURE 3A) with respect to the mobile station.
  • DO A direction of arrival
  • ⁇ azimuth orientation angle
  • first directive (sector) antenna 104 and the second directive (smart) antenna 110 Although illustrated as having a location verification module for each of the first directive (sector) antenna 104 and the second directive (smart) antenna 110, it will of course be understood that only one location verification module is typically needed for most applications and it is preferably used in conjunction with, and connected to, the second directive (smart) antenna. It is also possible to utilize a single location verification module in connection with both the first directive (sector) antenna 104 and the second directive (smart) antenna 110.
  • the base station 122 still further includes a smart antenna controller 136.
  • the smart antenna controller 136 operates responsive to a determined direction of arrival (DOA) azimuth orientation angle ⁇ (see, FIGURE 3 A) identification with respect to a certain mobile station, and then identifies a certain one of the plurality of separate, perhaps slightly overlapping, narrow beams 112 corresponding to that angle for serving the mobile station.
  • DOA direction of arrival
  • the smart antenna controller 136 then configures the second directive antenna 110 for operation to activate the identified beam 112 for handling communications with the mobile station (see, FIGURE 3B).
  • FIGURE 5 wherein there is shown a flow diagram for a first method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B.
  • a mobile station 114 within a cell 100 is currently in an on-call mode and is thus engaged in a cellular call on a traffic channel associated with a transceiver 124 in the second set 124(2) of transceivers.
  • the mobile station 114 is in voice channel communication with the base station 122 through use of a selected one of the smart antenna beams 112.
  • the base station 122 is aware of the direction of arrival (i.e., the azimuth orientation angle ⁇ ) with respect to the mobile station 114. It is still further assumed that a control channel for the cell 100 is supported by a transceiver 124 in the first set 124(1) of transceivers. Thus, the mobile station 114 is in control channel communication with the base station 122 through use of a sector antenna beam 106.
  • the mobile station makes a signal strength measurement on its serving control channel (SS MS cc ).
  • SS MS cc serving control channel
  • the signal strength measurement is accordingly indicative of sector antenna beam gain.
  • the mobile station may be told to make this measurement by the mobile switching center or base station by modifying the conventionally downloaded measurement list (which identifies measurement channels of neighboring cells) to additionally include an identification of the control channel utilized by the mobile station in the currently serving cell.
  • the mobile station makes a signal strength measurement on its serving traffic channel (SS MS ⁇ c ).
  • SS MS ⁇ c serving traffic channel
  • the signal strength measurement is accordingly indicative of smart antenna beam gain.
  • This traffic channel measurement is a conventional measurement made periodically by mobile stations in connection with normal operation.
  • the values of the signal strength measurements made in steps 200 and 202 are then reported to the base station and/or mobile switching center in step 204 along with an identification of the base station made azimuth orientation angle ⁇ to which these measurements relate.
  • the signal strength measurements may then be subtracted from each other (taking into account certain power offsets such as backoff and power control) in step 206 to determine a value indicative of the difference in gain between the sector beam 106 of the first directive antenna array 104 and the selected smart antenna beam 112 of the second directive antenna array 110 at the angle ⁇ .
  • PL is the path loss between the mobile station and base station
  • ANT is tne gain of the first directive antenna 104 in the base station
  • G SMART G SMART .
  • a N T C ⁇ ) is tne g am of the second directive antenna 110 in the base station at the determined direction of arrival angle ⁇ ; and ATT is the attenuation at the output of the transceiver (i.e., by an attenuator), wherein SS BS TC is measured before the output signal is attentuated.
  • the value of ATT is dynamically controlled by a power control algorithm.
  • the value of interest is the difference in gain between the sector beam 106 of the first directive antenna 104 and the selected smart antenna beam 112 of the second directive antenna 110 at the angle ⁇ . This may be obtained by subtracting Equation (1) from Equation (2) and rewriting as follows:
  • steps 200-206 may then be repeated (step 208) many times at different angles ⁇ to collect a statistically significant sampling of data and thus create in step
  • 210 a table (or corresponding function) specifying the difference in gain between the first directive antenna array 104 sector beams 106 and the second directive antenna array 110 smart antenna beams 112 as a function of the azimuth orientation angle ⁇ .
  • FIGURE 6 a schematic diagram illustrating an operating scenario for a second method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B and 4.
  • a mobile station 114 is engaged in a cellular call on a traffic channel and is currently being served by base station 122(s) in the currently serving cell 100(s). While engaged in this call, the mobile station 114 makes conventional MAHO measurements on the control channels broadcast by its neighboring cells 100. Downlink measurements made by the mobile station 114 (and perhaps also uplink measurements made by the currently serving base station 122(s)) indicate that a need for handing off the on going call may arise.
  • a request is accordingly made to the neighboring cells 100, including the cell 100(t), for uplink verification measurements to be made by their base stations 122, such as base station 122(t), on the current traffic channel.
  • the neighboring cell 100 reported verification measurements are then evaluated to select a target cell 100(t) for hand off.
  • the cellular call is then handed over to a traffic channel provided by the target base station 122(t) in the target cell 100(f).
  • FIGURE 7 a flow diagram for a second method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B and the scenario of FIGURE 6.
  • the verification process prior to mobile station 114 handoff is being performed. It is further assumed that the mobile station 114 is engaged in a cellular call on a traffic channel associated with a transceiver 124 in the second set 124(2) of transceivers for the serving base station 122(s).
  • the base station 122(f) second location verification module 134 operable in connection with the second directive antenna array 110 has made uplink measurements on that traffic channel and is aware of the direction of arrival (i.e., the angle ⁇ ) with respect to the mobile station 114. It is still further assumed that a control channel for the target cell 100(t) is supported by a transceiver 124 in the first set 124(1) of transceivers for the base station 122(f). Finally, it is assumed that the gain on the second directive (smart) antenna is substantially the same on both the uplink and downlink.
  • the mobile station 114 makes downlink received power measurements on the control channel for the target cell 100(t).
  • the mobile station 114 makes its received power measurement with respect to cellular communications operation use of the first directive antenna array 104 sector antenna beam 106 of the target cell 100(t).
  • the mobile station 114 reports its target cell 100(t) downlink control channel received power measurement value (P R,MS ) to m e serving base station 122(s) and mobile switching center along with an identification of its own power level setting (P T MS ) for uplink traffic channel communications.
  • P R,MS downlink control channel received power measurement value
  • P T MS power level setting
  • the target base station 122(f) in step 224, it makes uplink received power measurements on the traffic channel currently being utilized by the mobile station 114 for its communications with the serving base station 122(s).
  • the base station 122(t) makes its received power measurement with respect to cellular communications operation use of the second directive antenna array 110 smart antenna beam 112 of the target cell 100(t).
  • the target base station 122(t) reports its uplink traffic channel received power measurement value (P R ⁇ S ) to the mobile switching center along with an identification of its own power level setting
  • P T BS for downlink control channel communications as well as the determined direction of arrival (i.e., the angle ⁇ ) with respect to the mobile station 114.
  • the uplink traffic channel received power measurement value (P R ⁇ S ) is related to the mobile station 114 power level setting (P T MS ) for uplink traffic channel communications in accordance with the following equation:
  • PL is the path loss between the mobile station and base station
  • G MS ANT is the gain of the mobile station 114 antenna; and G SMART ANT ( ⁇ ) is the gain of the second directive antenna array 110 in the target base station 122(f) at the determined direction of arrival angle ⁇ .
  • the mobile station 114 downlink control channel received power measurement value (P R ⁇ M s) i s related to the target base station 122(f) power level setting (P T>BS ) for downlink control channel communications in accordance with the following equation:
  • G SECT0R ANT is the gain of the first directive antenna array 104 in the target base station 122(f).
  • the value of interest is the difference in gain between the sector beam 106 of the first directive antenna array 104 and the selected smart antenna beam 112 of the second directive antenna array 110 at the angle ⁇ . This may be obtained by subtracting Equation (5) from Equation (4) and rewriting as follows:
  • ⁇ , P R BS and P ⁇ BS are known and reported by the target base station in step 226;
  • P R MS and P T MS are known and reported by the mobile station 114 in step 222; and
  • the ⁇ GATN( ⁇ ) value may be normalized as needed for use in any subsequent evaluation, processing or review operation.
  • the mobile switching center processes the collected power information supplied by the mobile station 114 and target base station 122(t) using
  • Equation (6) to determine the difference in gain between the sector beam 106 of the first directive antenna array 104 and the selected smart antenna beam 112 of the second directive antenna array 110 at the angle ⁇ .
  • the process of steps 220-228 may then be repeated (step 230) many times at different angles ⁇ ' to collect a statistically significant sampling of data and thus create in step 232 a table (or corresponding function) specifying the difference in gain between the first directive antenna array 104 sector beams 106 and the second directive antenna array 110 smart antenna beams 112 as a function of the azimuth orientation angle ⁇ .
  • FIGURE 8 a schematic diagram illustrating an operating scenario for a third method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B.
  • a mobile station 114 is engaged in a cellular call on a traffic channel and is currently being served by base station 122(s) in the currently serving cell 100(s). While engaged in this call, a determination is made in the manner described above with respect to FIGURE 6 that there exists a need to handoff the on going call.
  • Each neighboring cell 100 then proceeds to make uplink verification measurements on the current traffic channel.
  • a target cell 100(t) is then selected for hand off.
  • FIGURE 9 a flow diagram for a third method of determining antenna gain difference with respect to the combined sectorized/smart antenna cell illustrated in FIGURES 3 A and 3B and the scenario of FIGURE 8.
  • the verification process prior to mobile station 114 handoff is being performed. It is further assumed that the mobile station 114 is engaged in a cellular call on a traffic channel associated with a transceiver 124 in the second set 124(2) of transceivers for the serving base station 122(s).
  • the base station 122(f) second location verification module 134 operable in connection with the second directive antenna array 110 has made uplink measurements on that traffic channel and is aware of the direction of arrival (i.e., the angle ⁇ ') with respect to the mobile station 114.
  • the gain on the second directive (smart) antenna is substantially the same on both the uplink and downlink.
  • the target base station 122(t) utilizes its first location verification module 132 operable in connection with the first directive antenna array 104 to make uplink signal strength measurements on the traffic channel currently being utilized by the mobile station 114 for its communications with the serving base station 122(s).
  • the target base station 122(s) makes its signal strength measurement with respect to cellular communications operation use of the sector antenna beam 106. The signal strength measurement is accordingly indicative of sector antenna beam gain.
  • the target base station 122(t) further utilizes its second location verification module 134 operable in connection with the second directive antenna array 110 to make uplink signal strength measurements on the traffic channel currently being utilized by the mobile station 114 for its communications with the serving base station 122(s).
  • the target base station 122(s) makes its signal strength measurement with respect to cellular communications operation use of the selected one of the smart antenna beams 112.
  • the signal strength measurement is accordingly indicative of smart antenna beam gain.
  • the target base station 122(s) reports its uplink sector beam traffic channel signal strength measurement value (SS TC SECTOR ) and uplink smart antenna beam traffic channel signal strength measurement value (SS TC . SMART ) o the mobile switching center along with an identification of the determined direction of arrival (i.e., the angle ⁇ ') with respect to the mobile station 114.
  • SS TC SECTOR uplink sector beam traffic channel signal strength measurement value
  • SS TC . SMART uplink smart antenna beam traffic channel signal strength measurement value
  • the signal strength measurements may then be subtracted from each other in step 246 to determine a value indicative of the difference in gain between the sector beam 106 of the first directive antenna array 104 and the selected smart antenna beam
  • step 246 maybe mathematically represented by the following equation:
  • the ⁇ GALN( ⁇ ') value may be normalized as needed for use in any subsequent evaluation, processing or review operation.
  • steps 240-246 may then be repeated (step 248) many times at different angles ⁇ ' to collect a statistically significant sampling of data and thus create in step 250 a table (or corresponding function) specifying the difference in gain between the first directive antenna array 104 sector beams 106 and the second directive antenna array 110 smart antenna beams 112 as a function of the azimuth orientation angle ⁇ .

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne une station de base cellulaire comprenant un premier réseau d'antennes directionnelles (104) (pour former un faisceau (106) par secteur cellulaire) et un second réseau d'antennes directionnelles (110) (pour former une pluralité de faisceaux étroits (112) par secteur cellulaire). Les modules de vérification d'emplacement (132, 134) sont destinés à fonctionner avec chacun des premier et second réseaux d'antennes directionnelles. On définit l'orientation azimutale de la station mobile par rapport à la station de base et on recueille les mesures de l'intensité du signal, les mesures de la puissance ainsi que des paramètres depuis la station mobile et la station de base et ce, dans le but d'identifier et de caractériser toute différence en gain entre les premier et second réseaux. Les données collectées sont ensuite traitées de manière mathématique (206, 228, 246) pour déterminer une valeur indiquant la différence en gain entre les premier et second réseaux comme fonction de l'orientation azimutale.
PCT/SE2000/000176 1999-02-26 2000-01-28 Procede d'acquisition de gain d'antenne dans un systeme cellulaire WO2000051364A2 (fr)

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Application Number Priority Date Filing Date Title
CA002362899A CA2362899A1 (fr) 1999-02-26 2000-01-28 Procede d'acquisition de gain d'antenne dans un systeme cellulaire
AU36850/00A AU3685000A (en) 1999-02-26 2000-01-28 Method for antenna gain acquisition in a cellular system
BR0008542-1A BR0008542A (pt) 1999-02-26 2000-01-28 Processo para determinar uma diferença em ganho dentro de uma determinada célula entre uma antena de setor e uma antena inteligente em um sistema celular, sistema celular, e, estação base para uma célula dentro de um sistema de comunicações celular

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US25907399A 1999-02-26 1999-02-26
US09/259,073 1999-02-26

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WO2000051364A3 WO2000051364A3 (fr) 2000-12-14

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WO2001065886A1 (fr) * 2000-03-03 2001-09-07 Telefonaktiebolaget Lm Ericsson (Publ) Transfert dans un systeme cellulaire utilisant des antennes a faisceaux etroit et large
US6549776B1 (en) 1999-07-30 2003-04-15 Telefonaktiebolaget Lm Ericsson (Publ) System, method, and apparatus for pushing data in a direct digital call environment
WO2004030239A1 (fr) * 2002-09-24 2004-04-08 Zte Corporation Antenne a microprocesseur et procede et dispositif de formation de faisceau pour cette antenne a microprocesseur
GB2414631A (en) * 2004-05-26 2005-11-30 Motorola Inc Control channel of a first cell gives directions in other cells not having control channels
EP2726897A1 (fr) * 2011-06-29 2014-05-07 Alcatel-Lucent Procédé et appareil de géo-localisation de station mobile
CN109041069A (zh) * 2018-07-02 2018-12-18 四川斐讯信息技术有限公司 一种调节路由器信号覆盖范围的方法及***
US10812125B1 (en) 2019-05-31 2020-10-20 Intel Corporation Radiation exposure control for beamforming technologies
CN112737715A (zh) * 2020-12-31 2021-04-30 Oppo广东移动通信有限公司 天线部署方法及其装置、客户前置设备和可读存储介质

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GB2320618A (en) * 1996-12-20 1998-06-24 Northern Telecom Ltd Base station antenna arrangement with narrow overlapping beams
EP0877444A1 (fr) * 1997-05-05 1998-11-11 Nortel Networks Corporation Architecture pour la formation de faisceaux dans la liaison descendante pour une configuration avec faisceaux en chevauchement

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EP0639035A1 (fr) * 1993-08-12 1995-02-15 Nortel Networks Corporation Dispositif d'antenne pour station de base
GB2320618A (en) * 1996-12-20 1998-06-24 Northern Telecom Ltd Base station antenna arrangement with narrow overlapping beams
EP0877444A1 (fr) * 1997-05-05 1998-11-11 Nortel Networks Corporation Architecture pour la formation de faisceaux dans la liaison descendante pour une configuration avec faisceaux en chevauchement

Cited By (11)

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AU3685000A (en) 2000-09-14
WO2000051364A3 (fr) 2000-12-14

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