WO2014136739A1 - Système de communication sans fil, dispositif de réglage, procédé de réglage, et programme - Google Patents

Système de communication sans fil, dispositif de réglage, procédé de réglage, et programme Download PDF

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Publication number
WO2014136739A1
WO2014136739A1 PCT/JP2014/055366 JP2014055366W WO2014136739A1 WO 2014136739 A1 WO2014136739 A1 WO 2014136739A1 JP 2014055366 W JP2014055366 W JP 2014055366W WO 2014136739 A1 WO2014136739 A1 WO 2014136739A1
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Prior art keywords
base station
tilt angle
radio
change
antenna
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PCT/JP2014/055366
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English (en)
Japanese (ja)
Inventor
太一 熊谷
尚 二木
弘人 菅原
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日本電気株式会社
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Priority to JP2015504307A priority Critical patent/JPWO2014136739A1/ja
Publication of WO2014136739A1 publication Critical patent/WO2014136739A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates to a wireless communication system, a control device, a control method, and a program.
  • a radio terminal communicates in a radio cell managed by each installed radio base station.
  • a wireless terminal moves across a plurality of wireless cells, it is necessary to partially overlap the coverage of adjacent wireless cells in order to continue communication.
  • the coverage is a cover area where a wireless quality sufficient for the wireless terminal to perform communication is maintained.
  • a technique for adjusting the coverage for example, a method using the antenna tilt angle of each wireless cell is conceivable.
  • the coverage of each wireless cell is uniform, and the adjustment of the antenna tilt angle is relatively easy.
  • the coverage of a radio cell has a complicated shape due to the influence of topography and buildings of various sizes and due to location restrictions in laying radio base stations. For this reason, the above-described coverage adjustment of the radio cell is performed by a drive test using a radio wave measurement vehicle and a careful adjustment work of radio parameters by a skilled engineer, and a large operation cost is required.
  • Patent Document 1 candidate values for antenna tilt angles of radio cells are set, and these are sequentially applied to actual radio cells, and the received signal strength (simply simply at a radio terminal in the radio cell in a certain measurement period). And a control method for measuring an uplink (uplink) interference at a radio base station and selecting an appropriate antenna tilt angle.
  • Patent No. 4220611
  • the candidate value of the antenna tilt angle is applied to an actual radio cell, so that the coverage may be insufficient depending on the candidate value, and there is a possibility that a weak electric area or a dead area may occur.
  • the measurement information of the wireless terminal is collected from an area where communication is possible, in particular, there may be a case where a dead area once generated cannot be detected. For this reason, there is a possibility that the antenna tilt angle at which the dead zone actually occurs is selected. Therefore, it is necessary to control the antenna tilt angle autonomously so as to appropriately adjust the coverage while suppressing the occurrence of a low power area and a dead area.
  • the problem to be solved by the present invention is to solve the above-mentioned problems, and to suppress the generation of weak electric areas and dead areas accompanying the control of the antenna tilt angle.
  • the present invention provides the following radio communication system, radio base station, and radio parameter control method in order to solve the above problems.
  • the present invention is a radio communication system for controlling antenna parameters of radio cells managed by a radio base station, based on measurement information on radio quality or radio communication status reported by radio terminals that can communicate with the radio base station.
  • An estimation means for estimating a change level of the reception strength of the signal from the radio base station after the change of the antenna tilt angle of the radio base station, and the antenna tilt angle based on the estimated change level of the reception strength.
  • Control means for controlling.
  • the present invention is a control device for controlling antenna parameters of a radio cell managed by a radio base station, based on measurement information related to radio quality or radio communication status reported by a radio terminal capable of communicating with the radio base station, Estimating means for estimating a change level of the reception intensity of the signal from the radio base station after changing the antenna tilt angle of the radio base station, and controlling the antenna tilt angle based on the estimated change degree of the reception intensity Control means.
  • the present invention is a control method for controlling antenna parameters of a radio cell managed by a radio base station, based on measurement information related to radio quality or radio communication status reported by a radio terminal capable of communicating with the radio base station, An estimation step for estimating the degree of change in the reception strength of the signal from the radio base station after the change in the antenna tilt angle of the radio base station, and the antenna tilt angle is controlled based on the degree of change in the estimated reception strength A control step.
  • the present invention relates to a program for a control device that controls antenna parameters of a radio cell managed by a radio base station, and the program reports radio quality reported by a radio terminal capable of communicating with the radio base station.
  • an estimation unit that estimates a degree of change in reception intensity of a signal from the radio base station after changing an antenna tilt angle of the radio base station, and a change in the estimated reception intensity It functions as a control means for controlling the antenna tilt angle based on the degree.
  • the present invention it is possible to adjust the coverage of a radio cell while suppressing the occurrence of a weak electric area and a dead zone associated with a change in antenna tilt angle as much as possible.
  • the reason is to determine whether or not the antenna tilt angle can be changed by estimating whether or not sufficient received signal strength can be obtained after changing the antenna tilt angle based on the measurement result of the wireless quality from the wireless terminal. .
  • the basic principle of the present invention is that wireless base stations or network operation management apparatuses (also called SON (self-organizing network) servers) measure information related to wireless quality or wireless communication status reported by wireless terminals that can communicate with the wireless base station. On the basis of the antenna tilt angle of the radio base station, the degree of change in the reception strength of the signal transmitted by the radio base station is estimated, and the antenna tilt angle is controlled based on the estimated degree of change. is there.
  • SON self-organizing network
  • control is started after determining whether or not to change the antenna tilt angle before the control.
  • the coverage change rate is calculated based on the estimated change level of the received strength, and it is determined whether the antenna tilt angle is controlled based on whether the coverage change rate is less than a predetermined coverage change rate.
  • the coverage change rate for example, the area rate at which the reception intensity of the signal transmitted by the radio base station is less than the required quality, or the area rate at which communication is impossible, is considered, and the coverage change rate (in this case, The antenna tilt angle is changed when the coverage deterioration rate is less than a predetermined coverage change rate.
  • the degree of change in reception strength is estimated by at least one of the antenna tilt angle, the antenna height, the antenna gain pattern, or the expected angle to the cell edge of the radio base station that manages the radio cell to be controlled by the antenna tilt angle. Use one.
  • the degree of change in the reception strength the amount of change in reception strength or the maximum amount of change accompanying the change in antenna tilt angle is used. Note that the amount of change and the rate of change can be considered as the degree of change.
  • 3GPP 3rd Generation Generation Partnership Project
  • LTE Long Term Term Evolution
  • GSM Global System for Mobile communications: a registered trademark
  • UMTS Universal Mobile Telecommunications System
  • CDMA2000 Code Division Multiple Access 2000
  • HRPD HRPD
  • WiMAX Worldwide Interoperability for Microwave Access
  • FIG. 1 shows the configuration of a wireless communication system as an embodiment of the present invention.
  • the wireless communication system includes an external network 100, a core network 101, a wireless access network 102, a network management apparatus 103, wireless base stations 120 and 121, and wireless terminals 130 to 132.
  • the external network 100 and the core network 101 are connected to each other via a wired link 110, and the core network 101 and the wireless access network 102 are connected to each other via a wired link 111.
  • the network management device 103 is connected to the core network 101 via the wired link 113, and is connected to the wireless access network 102 via the wired link 112, manages the communication state of both networks, and performs maintenance and operation.
  • the radio base stations 120 and 121 manage the radio cells 140 and 141, respectively.
  • the radio terminals 130, 131, and 132 have radio links with the radio base stations 120 and 121 that manage the radio cells 140 and 141 to which the radio terminals are connected. Communicate through.
  • it demonstrates using the structure which has two of the wireless base stations 120 and 121, it is not necessary to limit the number in this invention.
  • the wireless terminals 130, 131 and 132 have a wireless quality measurement function, and measure the wireless quality periodically or in response to an arbitrary measurement trigger. Note that although a description will be given using a configuration having three radio terminals 130 to 132, the number of radio terminals need not be limited in the present invention.
  • FIG. 2 shows an example of the configuration of the network management apparatus 103 and the radio base station 120 shown in FIG.
  • the radio base station 120 includes a measurement control unit 211 and a transmission / reception unit 210.
  • the measurement control unit 211 in the radio base station 120 collects radio quality measurement information from the radio terminal 132 using the transmission / reception unit 210, and notifies the network management apparatus 103 periodically or according to an arbitrary trigger.
  • the network management apparatus 103 aggregates the measurement information notified from one or more radio base stations and stores it in the radio quality statistical information storage apparatus 201.
  • the measurement information of radio quality includes received power (RSRP: Reference Signal Received Power) of a reference signal from one or more radio base stations.
  • the received signal strength estimation unit 212 uses the antenna gain pattern to perform one or more of each of the one or more associated with the change of the antenna tilt angle in the radio cell (hereinafter referred to as the own cell) that is the object of antenna tilt angle control.
  • the amount of change or the maximum amount of change in the reception strength of signals from the radio cell (here, RSRP is assumed) is estimated.
  • the change amount of the received signal strength or the estimated maximum change amount in the antenna tilt angle change candidate value includes the change history of one or more antenna tilt angles in the own cell and the measurement information corresponding to the history. You may use the estimated value obtained by the linear interpolation method using received signal strength.
  • the change degree of the received signal strength when the antenna tilt angle of the own cell is changed is estimated.
  • the amount of change is assumed as the degree of change in received signal strength.
  • the reception strength is not necessarily RSRP, and may be another index such as RSSI (Received Signal Strength Indicator).
  • the antenna parameter control determination unit 213 calculates a coverage change rate based on the amount of change in received signal strength when the antenna tilt angle is changed, and determines whether the antenna change rate is less than a predetermined coverage change rate. It is determined whether or not to change the tilt angle.
  • a coverage change rate a coverage degradation rate that is an area rate at which the received signal strength is less than the required quality may be used.
  • the antenna tilt angle is changed when the coverage degradation rate is less than the predetermined coverage degradation rate. To do.
  • the base station information storage device 200 is updated.
  • the distribution of the change amount of the received signal strength is estimated, and a predetermined point of the distribution, for example, a cumulative distribution function (CDF: CumulativebDistributed)
  • CDF CumulativebDistributed
  • An arbitrary value of (Function) may be used instead of the maximum change amount.
  • FIG. 3 shows the contents of the base station information 300 held by the base station information storage device 200.
  • the station information 310 including the base station ID 301, the cell ID 302, and the installation point 303, the cell ID 302, the maximum transmission power 304, and the parameters including the antenna configuration 305 including the height, directivity pattern, azimuth angle, and elevation angle.
  • Information 320 is defined.
  • the maximum transmission power 304 and the antenna configuration 305 are notified to the network management apparatus 103 when the setting values are changed.
  • operation information such as traffic load measured in each wireless cell per unit time is also notified to the network management apparatus 103.
  • FIG. 4 shows the content of the measurement information 400 measured by the wireless terminal 132.
  • Rank 401, RSRP value 402, and cell ID 403 are defined.
  • the wireless terminal measures the RSRP of one or more wireless cells and reports it to the connected wireless base station. Based on the measurement information, the radio base station or the network management apparatus rearranges them by adding Ranks in descending order of the RSRP value, and associates them with the ID of the radio cell of the transmission source.
  • the wireless terminal is connected to the wireless cell X having the largest RSRP value. That is, the radio cell X corresponding to Rank # 1 becomes Serving Cell, and the subsequent radio cells A to F corresponding to Rank # 2 to 7 are Neighbor Cell.
  • the measurement control unit 211 operates as follows.
  • the measurement control unit 211 in the radio base station 120 collects measurement information, which is information on radio quality or radio communication status, from radio terminals in communication in the radio cell 140 managed by the radio base station 120.
  • the collected measurement information is notified to the network management apparatus 103 periodically or according to an arbitrary trigger, and stored in the wireless quality statistical information storage apparatus 201.
  • the operation described below is performed for one or more candidate values of the antenna tilt angle.
  • the received signal strength estimating unit 212 operates as follows. When a predetermined time has elapsed or sufficient measurement information has been collected, the received signal strength estimation unit 212 starts an estimation process. First, measurement information collected from a wireless terminal is acquired from the wireless quality statistical information storage device 201 (step S101), and the total number of collected measurement information is counted (step S102).
  • the distance to the cell edge 511 of the own cell is estimated (step S103).
  • the distance to the cell edge 511 of the own cell is estimated using the installation point 303 and the antenna configuration 305 in the base station information regarding the radio base stations of the own cell and the adjacent cells. For example, when the maximum transmission power, altitude, antenna height 512, and elevation angle of the own cell and adjacent cells are equal, the distance to the midpoint between the two cells may be used. Further, it may be obtained by utilizing actual measurement data obtained from a drive test or the like that can grasp the position of measurement information. In this case, the radio base station may execute processing associated with control of the antenna tilt angle. good.
  • a prospective angle 513 to the cell edge is calculated (step S104).
  • the amount of change in the received signal strength associated with the downtilt is the largest at the cell edge 511, and therefore, the estimated angle 513 toward the cell edge is used here for estimating the maximum amount of change ⁇ 520 in the received signal strength.
  • the maximum change amount ⁇ 520 of the received signal strength due to the change in the antenna tilt angle is estimated (step). S105).
  • FIG. 6 shows a schematic diagram of an estimation method of the maximum change amount of the received signal intensity using the antenna gain pattern.
  • an antenna gain pattern (before change) 500 (dotted line portion) indicates an antenna gain pattern before the antenna tilt angle is changed
  • an antenna gain pattern (after change) 501 (solid line portion) is the antenna gain pattern after change. Is shown.
  • the difference in antenna gain before and after the change is the largest at the cell end 511 of the radio cell 140, and the difference corresponds to the maximum change amount ⁇ 520 of the received signal strength.
  • Equation 1 H ant is the antenna height
  • D edge is the distance from the antenna to the cell edge
  • ⁇ ant is the antenna tilt angle after change
  • ⁇ pre is the antenna tilt angle before change
  • ⁇ 3 dB is the 3 dB beam width of the antenna
  • Atn () is an arctangent function.
  • the RSRP value of the own cell when the antenna tilt angle of the own cell is changed is less than the required quality necessary for satisfying the desired radio quality, and the RSRP value of the neighboring cell.
  • Measurement information that is less than the RSRP value indicating the largest value is extracted (step S106).
  • the extracted information includes the RSRP value of the own cell and the RSRP value of the neighboring cell indicating the largest value.
  • the RSRP value of the neighboring cell is extracted because the radio terminal that is expected to switch the connection to the neighboring cell by changing the antenna tilt angle can maintain sufficient radio quality after switching the connection. This is to determine whether or not.
  • Fig. 7 shows an example of the contents of the extracted information.
  • the RSRP value of ServingSCell X and the RSRP values of Cell A and Cell C indicating the largest RSRP value in Neighbor Cell (Pal , Pc2).
  • the RSRP value of Serving Cell X in the extracted information 600 reflects the maximum change amount ⁇ 520 of the received signal strength estimated in step S105 (that is, a value obtained by subtracting ⁇ ), and Px1- ⁇ and Px2- ⁇ are It is assumed that the quality is less than the required quality, or is less than Pal and Pc2, respectively.
  • the antenna parameter control determination unit 213 operates as follows. First, the reception signal strength of the own cell after changing the antenna tilt angle estimated from the reception signal strength estimation unit 212 (here, RSRP is assumed) and the extraction information of the reception signal strength of the adjacent cell are acquired (step S201).
  • the extracted information is selected one by one, and the RSRP value of the own cell after changing the antenna tilt angle is compared with the RSRP value of the neighboring cell, but first, is there an unselected (unselected) received signal strength? It is determined whether or not (step S202). If there is an unselected received signal strength (step 202: Yes), one of them is selected (step S203). Then, the RSRP value of the own cell after the antenna tilt angle change is compared with the RSRP value of the adjacent cell (step S204). If the RSRP value of the own cell is large (step S204: Yes), the RSRP value of the own cell is changed. The required quality is compared (step S205).
  • step S207 when the RSRP value of the own cell is less than the required quality (step S205: No), it is counted as the coverage deterioration number (step S207). If the RSRP value of the neighboring cell is larger than the RSRP value of the own cell in step S204 (step S204: No), the RSRP value of the neighboring cell is compared with the required quality (step S206). Similarly, if the RSRP value of the adjacent cell is less than the required quality, it is counted as the coverage deterioration number (step S207).
  • step S208 the ratio of the coverage deterioration number to the total number of measurement information is calculated as the coverage deterioration rate (step S208).
  • step S209 the calculated coverage deterioration rate is compared with a predetermined coverage change rate.
  • step S209: Yes the coverage deterioration rate is less than the predetermined coverage change rate
  • step S210 the coverage deterioration rate is equal to or higher than the predetermined coverage change rate (step S209: No)
  • step S211 the change of the antenna tilt angle is denied (step S211).
  • the amount of change of the antenna tilt angle can be set using this embodiment. calculate.
  • the basic operation is the same as the operation described with reference to FIGS. 5 to 8 except that the expected angle to the weak electric area or the dead area is used instead of the expected angle 513 to the cell edge.
  • the maximum change amount of the received signal strength at one or more candidate antenna tilt angles is estimated. First, based on the antenna azimuth angle of each radio cell, a radio cell including the weak power area or the dead zone is extracted within a predetermined horizontal angle range from the antenna azimuth angle.
  • the following processing may be performed by extracting again a wireless cell whose distance between the extracted wireless cell and the weak power area or the dead zone is within a predetermined value.
  • the distance attenuation amount of the received signal strength is estimated based on the distance from the weak power area or the dead zone.
  • a generally known radio wave propagation model is used for estimating the distance attenuation.
  • the maximum change amount of the received signal strength at one or more candidate antenna tilt angle values is estimated using the antenna gain pattern and the expected angle to the weak power area or the dead zone.
  • the received signal strength in the weak power area or the dead zone is calculated from the estimated distance attenuation amount, the maximum change amount of the received signal strength, and the transmission power value of the wireless cell. Further, by comparing the calculated received signal strength with the required value, a change value of the antenna tilt angle necessary for eliminating the low power area or the dead zone is calculated.
  • the maximum change amount of the received signal strength accompanying the change of the antenna tilt angle is estimated based on the measurement information of the radio quality collected from the radio terminal and the base station information. Further, the coverage deterioration rate after changing the antenna tilt angle is estimated using the maximum change amount of the received signal strength, and whether or not the antenna tilt angle can be changed is determined. Thereby, it is possible to optimize the coverage while suppressing the generation of the weak electric area and the dead area due to the change of the antenna tilt angle.
  • the occurrence location of the weak power area is specified, and when the response is made by changing the antenna tilt angle of the surrounding wireless cell, the corresponding weak power area is entered. From the expected angle and the antenna gain pattern, it is possible to estimate the amount of change in the antenna tilt angle necessary for eliminating the low power area. Based on the change amount of the antenna tilt angle, by selecting an appropriate radio cell and changing the antenna tilt angle, it is possible to contribute to improving the radio quality as a result.
  • the wireless base station may execute the processes associated with the control of the antenna tilt angle. In the case of such a configuration, there is an effect that signaling in collecting measurement results of radio quality from radio terminals is reduced.
  • the basic configuration of the second embodiment is the same as that of the first embodiment. Further, the basic operation is the same as in FIG. 5 and FIG. 8 in the first embodiment, but excludes all measurement information including a wireless cell belonging to the same wireless base station in NeighborbCell. Specifically, in step S106 described in FIG. 5, information including IDs of other radio cells belonging to the same radio base station as the own cell is excluded, and other information belonging to other radio base stations different from Serving Cell Measurement information indicating the maximum received signal strength among the received signal strengths of signals from the radio cell is extracted.
  • FIG. 9 shows an example of extracted information when X, A, and C belong to the same radio base station.
  • information including IDs of radio cells belonging to the same radio base station may be excluded. That is, the received signal strength of a signal from a wireless cell existing within a predetermined horizontal angle may be calculated with reference to the antenna azimuth angle of the own cell, and measurement information indicating the highest received signal strength may be extracted. .
  • the extraction information is generated from the measurement information at the cell edge where the amount of change in the received signal strength due to the downtilt of the own cell is the largest, so the coverage degradation rate after changing the antenna tilt angle is more accurately determined. Can be estimated. As a result, it is possible to adjust the coverage without greatly degrading the radio quality in the radio terminal in the radio cell.
  • the present invention can be realized with a realistic processing amount even in a radio cell covering a high traffic area where a large amount of measurement information is collected or in a radio cell covering a wide area.
  • the basic configuration of the third embodiment is the same as that of the first embodiment. Further, the basic operation is the same as in FIG. 5 and FIG. 8 in the first embodiment, but after changing the antenna tilt angle of the own cell, the number of wireless terminals that switch connection to another adjacent wireless cell is estimated. The load of the own cell and the neighboring cell is estimated. Specifically, in step S203 described in FIG. 8, the ratio of terminals that switch the connection to the neighboring cell from the total number of measurement information by counting measurement information in which the RSRP value of the own cell is less than the RSRP value of the neighboring cell, or The number is estimated, and the load amount of the adjacent cell when the antenna tilt angle is changed is estimated based on the load information of the own cell and the adjacent cell.
  • FIG. 10 shows an example of the ratio of wireless terminals that switch connections to adjacent cells when the antenna tilt angle of the wireless cell X is changed.
  • 15% of the load of the wireless cell X is transferred to the adjacent wireless cell A. If 15% of the load of the radio cell X can be allowed in the cell A (that is, less than a predetermined load amount), and a part of the load of the radio cell X can be allowed in other radio cells as well.
  • the antenna tilt angle of the wireless cell X is changed.
  • the effect of this embodiment will be described.
  • the ratio or the number of radio terminals that switch the connection from the own cell to the adjacent cell is calculated. Estimated. Further, the load amount of the adjacent cell after changing the antenna tilt angle is estimated from the estimated value and the load of the own cell and the adjacent cell, and whether or not the antenna tilt angle can be changed is determined. Thereby, it is possible to suppress the occurrence of congestion in the adjacent cell due to the change of the antenna tilt angle of the own cell.
  • the present invention in a wireless communication system, can be applied to applications such as a wireless base station or a network management device that controls an antenna tilt angle based on measurement information of wireless terminals.
  • the present invention when the location of a weak power area and a dead area by a drive test or the like is made, or when a weak power area occurs due to a failure of a wireless base station or a power failure,
  • the present invention can be applied to applications such as coverage adjustment in surrounding radio base stations.
  • a wireless communication system comprising: control means for controlling the antenna tilt angle based on the estimated degree of change in received intensity.
  • the control means calculates a coverage change rate of the radio base station based on the degree of change estimated by the estimation means, and calculates the antenna tilt angle based on the calculated coverage change rate and a predetermined coverage change rate.
  • the wireless communication system according to supplementary note 1, wherein the wireless communication system is configured to control the antenna tilt angle when it is determined whether to control the antenna tilt angle.
  • the control means calculates, as the coverage change rate, an area rate at which the received intensity of the signal from the radio base station is less than required quality, or a coverage deterioration rate that is an area rate at which communication is impossible, and the calculation
  • the wireless communication system according to supplementary note 2, wherein the antenna tilt angle is changed when the coverage deterioration rate is less than a predetermined coverage change rate.
  • Appendix 4 The wireless communication according to any one of appendix 1 to appendix 3, wherein the estimation unit estimates the degree of change based on a change amount of an antenna gain after changing an antenna tilt angle of the radio base station and the measurement information. system.
  • the estimation means uses at least one of the antenna tilt angle, the antenna height, the antenna gain pattern, and the expected angle to the cell edge of the radio base station, and the amount of change in reception intensity or the maximum with the change of the antenna tilt angle.
  • the wireless communication system according to any one of appendix 1 to appendix 4, which estimates an amount of change.
  • the estimation means estimates an antenna gain amount before control at the cell edge based on the antenna gain pattern using an antenna tilt angle before control of the radio base station and a prospective angle to the cell edge, and Using the antenna tilt angle after control of the base station and the estimated angle to the cell edge, the amount of antenna gain after control at the cell edge based on the antenna gain pattern is estimated, and the estimated before and after control
  • the wireless communication system according to appendix 5, wherein the amount of change in reception strength at a cell edge, which is the maximum amount of change in reception strength, is estimated by comparing the amount of antenna gain of
  • the estimation means estimates the signal reception strength of the cell when the antenna tilt angle of the radio base station is changed based on the maximum change amount of the reception strength, and the estimated reception strength is less than the required quality.
  • the radio according to appendix 5 or appendix 6, wherein measurement information and measurement information whose estimated reception strength is lower than the maximum reception strength among the reception strengths of signals from adjacent radio base stations adjacent to the radio base station are extracted. Communications system.
  • the control means calculates a reception strength of a signal from another radio base station different from the radio base station that manages a radio cell in which the radio terminal stays, and calculates the calculated reception strength and the required quality.
  • the wireless communication system according to supplementary note 7 or supplementary note 8 to be compared.
  • the control means calculates a reception strength of a signal from a radio base station existing within a predetermined horizontal angle on the basis of an antenna azimuth angle of the radio base station, and compares the calculated reception strength with the required quality.
  • the wireless communication system according to any one of appendix 7 to appendix 9.
  • the control means includes Using the reception intensity of signals from the radio base station and at least one or more adjacent base stations and the maximum change amount of the reception intensity when the antenna tilt angle is changed, the antenna tilt angle is controlled after the control. Estimate the number of wireless terminals that switch connections to neighboring base stations, Based on the load information of the radio base station and the adjacent base station, the antenna tilt angle is changed when the load of the radio base station and the adjacent base station after the control of the antenna tilt angle is less than a predetermined load amount.
  • the wireless communication system according to any one of appendix 7 to appendix 10.
  • the measurement information includes at least one of a reference signal received power (RSRP) that is a received power of a reference signal and a reference signal received quality (RSRQ) that is a received quality of the reference signal.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • a control device for controlling antenna parameters of a radio cell managed by a radio base station Based on measurement information related to radio quality or radio communication state reported by a radio terminal capable of communicating with the radio base station, a change in signal reception intensity from the radio base station after changing the antenna tilt angle of the radio base station
  • An estimation means for estimating the degree A control device comprising: control means for controlling the antenna tilt angle based on the estimated degree of change in received intensity.
  • Appendix 16 The control apparatus according to any one of appendix 13 to appendix 15, wherein the estimation means estimates the degree of change based on an amount of change in antenna gain after changing an antenna tilt angle of the radio base station and the measurement information. .
  • the estimation means estimates an antenna gain amount before control at the cell edge based on the antenna gain pattern using an antenna tilt angle before control of the radio base station and a prospective angle to the cell edge, and Using the antenna tilt angle after control of the base station and the estimated angle to the cell edge, the amount of antenna gain after control at the cell edge based on the antenna gain pattern is estimated, and the estimated before and after control 18.
  • the control device wherein a change amount of the reception strength at the cell edge, which is a maximum change amount of the reception strength, is estimated by comparing the antenna gain amounts of the received antenna gains.
  • the control means compares the received quality of the signal from the radio base station when the antenna tilt angle of the radio base station is changed or the extracted received strength of the signal from the adjacent radio base station and the required quality.
  • the control apparatus according to supplementary note 19, wherein the coverage change rate is calculated, and the antenna tilt angle of the radio base station is changed when the calculated coverage change rate is less than the predetermined coverage change rate.
  • the control means includes Using the reception intensity of signals from the radio base station and at least one or more adjacent base stations and the maximum change amount of the reception intensity when the antenna tilt angle is changed, the antenna tilt angle is controlled after the control. Estimate the number of wireless terminals that switch connections to neighboring base stations, Based on the load information of the radio base station and the adjacent base station, the antenna tilt angle is changed when the load of the radio base station and the adjacent base station after the control of the antenna tilt angle is less than a predetermined load amount.
  • the control device according to any one of appendix 19 to appendix 22.
  • the measurement information includes at least one of a reference signal received power (RSRP: Reference Signal Received Power) that is a received power of a reference signal and a reference signal received quality (RSRQ: Reference Signal Received Quality) that is a received quality of the reference signal.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • Appendix 25 A control method for controlling antenna parameters of a radio cell managed by a radio base station, Based on measurement information related to radio quality or radio communication state reported by a radio terminal capable of communicating with the radio base station, a change in signal reception intensity from the radio base station after changing the antenna tilt angle of the radio base station An estimation step for estimating the degree; And a control step of controlling the antenna tilt angle based on the estimated degree of change in received intensity.
  • Appendix 28 28.
  • the estimation step uses at least one of the antenna tilt angle, the antenna height, the antenna gain pattern, and the expected angle to the cell edge of the radio base station, and the received intensity change amount or the maximum with the change of the antenna tilt angle.
  • the control method according to any one of appendix 25 to appendix 28, wherein the amount of change is estimated.
  • the control step compares the required quality with the received strength of the signal from the radio base station or the extracted received strength of the signal from the adjacent radio base station when the antenna tilt angle of the radio base station is changed.
  • the control step calculates a reception strength of a signal from another radio base station different from the radio base station that manages a radio cell in which the radio terminal stays, and calculates the calculated reception strength and the required quality.
  • the control step calculates a reception strength of a signal from a radio base station existing within a predetermined horizontal angle with reference to an antenna azimuth angle of the radio base station, The control method according to any one of Supplementary Note 31 to Supplementary Note 33, wherein the control step compares the calculated received intensity with the required quality.
  • the measurement information includes at least one of a reference signal received power (RSRP) that is a received power of a reference signal and a reference signal received quality (RSRQ) that is a received quality of the reference signal.
  • RSRP reference signal received power
  • RSRQ reference signal received quality

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

Abstract

La présente invention a pour objectif de résoudre le problème lié à l'optimisation de la couverture d'une cellule sans fil, sur la base d'un résultat de mesurage de la qualité de communication à partir de terminaux sans fil, tout en empêchant la création de zones mortes et de zones de faible réception qui accompagnent des changements de l'angle d'inclinaison d'une antenne. Afin d'atteindre l'objectif visé, la présente invention se rapporte à un système de communication sans fil comprenant un dispositif de réglage qui règle des paramètres d'antenne pour des cellules sans fil gérées par des stations de base sans fil. Le dispositif de réglage selon l'invention comprend : des moyens d'estimation qui, sur la base d'informations de mesurage relatives à un état de communication sans fil ou à une qualité de communication sans fil rapportés par des terminaux sans fil qui sont aptes à communiquer avec les stations de base sans fil, estiment un degré de changement de l'intensité de réception de signal de signaux en provenance des stations de base sans fil, après que l'angle d'inclinaison de l'antenne des stations de base sans fil a été changé; et des moyens de réglage qui règlent l'angle d'inclinaison de l'antenne sur la base du degré estimé de changement de l'intensité de réception de signal.
PCT/JP2014/055366 2013-03-04 2014-03-04 Système de communication sans fil, dispositif de réglage, procédé de réglage, et programme WO2014136739A1 (fr)

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KR20210030769A (ko) * 2019-09-10 2021-03-18 주식회사 케이티 안테나에 대한 최적화 파라미터를 도출하는 방법, 장치 및 컴퓨터 프로그램
KR20210143989A (ko) * 2020-05-21 2021-11-30 주식회사 엘지유플러스 안테나의 최적 각도를 결정하는 방법 및 장치
WO2023157198A1 (fr) * 2022-02-17 2023-08-24 日本電信電話株式会社 Dispositif d'optimisation d'angle d'inclinaison, procédé d'optimisation d'angle d'inclinaison, et programme
WO2023162148A1 (fr) * 2022-02-25 2023-08-31 日本電信電話株式会社 Procédé de conception d'itinéraire de mesure, dispositif de conception d'itinéraire de mesure et programme
WO2023191832A1 (fr) * 2022-03-31 2023-10-05 Rakuten Symphony Singapore Pte. Ltd. Procédé, appareil et support lisible par ordinateur
WO2024061001A1 (fr) * 2022-09-19 2024-03-28 中兴通讯股份有限公司 Procédé et appareils de détermination de paramètres d'antenne

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WO2019026375A1 (fr) * 2017-08-04 2019-02-07 ソニー株式会社 Dispositif de commande, dispositif sans fil, procédé et support d'enregistrement
JPWO2019026375A1 (ja) * 2017-08-04 2020-06-18 ソニー株式会社 制御装置、無線装置、方法及び記録媒体
US11350422B2 (en) 2017-08-04 2022-05-31 Sony Corporation Control device, wireless device, method, and recording medium
JP7196844B2 (ja) 2017-08-04 2022-12-27 ソニーグループ株式会社 制御装置、無線装置、方法及び記録媒体
KR20210030769A (ko) * 2019-09-10 2021-03-18 주식회사 케이티 안테나에 대한 최적화 파라미터를 도출하는 방법, 장치 및 컴퓨터 프로그램
KR102352781B1 (ko) * 2019-09-10 2022-01-18 주식회사 케이티 안테나에 대한 최적화 파라미터를 도출하는 방법, 장치 및 컴퓨터 프로그램
KR20210143989A (ko) * 2020-05-21 2021-11-30 주식회사 엘지유플러스 안테나의 최적 각도를 결정하는 방법 및 장치
KR102368827B1 (ko) * 2020-05-21 2022-02-28 주식회사 엘지유플러스 안테나의 최적 각도를 결정하는 방법 및 장치
WO2023157198A1 (fr) * 2022-02-17 2023-08-24 日本電信電話株式会社 Dispositif d'optimisation d'angle d'inclinaison, procédé d'optimisation d'angle d'inclinaison, et programme
WO2023162148A1 (fr) * 2022-02-25 2023-08-31 日本電信電話株式会社 Procédé de conception d'itinéraire de mesure, dispositif de conception d'itinéraire de mesure et programme
WO2023191832A1 (fr) * 2022-03-31 2023-10-05 Rakuten Symphony Singapore Pte. Ltd. Procédé, appareil et support lisible par ordinateur
WO2024061001A1 (fr) * 2022-09-19 2024-03-28 中兴通讯股份有限公司 Procédé et appareils de détermination de paramètres d'antenne

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