WO2014162711A1 - 無線パラメータ制御方法および装置、ネットワーク運用管理装置ならびに無線基地局 - Google Patents
無線パラメータ制御方法および装置、ネットワーク運用管理装置ならびに無線基地局 Download PDFInfo
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- WO2014162711A1 WO2014162711A1 PCT/JP2014/001843 JP2014001843W WO2014162711A1 WO 2014162711 A1 WO2014162711 A1 WO 2014162711A1 JP 2014001843 W JP2014001843 W JP 2014001843W WO 2014162711 A1 WO2014162711 A1 WO 2014162711A1
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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
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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
- H04W16/22—Traffic simulation tools or models
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Definitions
- the present invention relates to a radio communication system, and more particularly to a method and apparatus for controlling radio parameters of a base station, a network operation management apparatus, and a radio base station.
- Non-patent Document 1 SON (Self Organizing Network) that autonomously optimizes wireless parameters and network settings in a wireless communication system such as a cellular system has been actively studied.
- the types of self-optimization include cell coverage optimization, capacity optimization (Coverage and Capacity Optimization: CCO), handover parameter optimization (Mobility Robustness Optimization: MRO), and load balancing. There is optimization (Mobility Load Balancing: MLB).
- SON recognizes problems using radio quality information reported from terminals and communication quality statistical information collected by base stations, and autonomously optimizes base station radio parameters so that the problems can be improved. Turn into. As information reported from the terminal, information specified by 3GPP is used, but most of the SONs currently under study use the wireless quality measured by the terminal in the wireless connection state (RRC Connected state). .
- 3GPP Release 10 has newly defined MDT (Minimization of Drive Test) for the purpose of minimizing (minimizing) driving tests related to wireless network operation management.
- MDT Minimum of Drive Test
- a terminal in a wireless connection state performs measurement and reporting, and an immediate report mode (Immediate MDT) and a terminal in an idle state (RRC Idle state) record a measurement result and report it when the wireless connection state is established.
- the record report mode (Logged MDT) is specified.
- the information to be measured includes not only wireless quality information but also location information of the measurement terminal (for example, GNSS (Global Navigation Satellite System) information such as GPS (Global Positioning System)).
- GNSS Global Navigation Satellite System
- GPS Global Positioning System
- the base station parameters can be optimized based on the radio quality information measured by the terminal in the immediate report mode or the record report mode.
- 3GPP TS36.300v10.5.0 Section 22 (Internet ⁇ URL> http: www.3gpp.org/ftp/Specs/html-info/36300.htm) 3GPP TR36.902 v9.3.0 (Internet ⁇ URL> http: www.3gpp.org/ftp/Specs/html-info/36902.htm)
- an object of the present invention is to provide a radio parameter control method and apparatus, a network operation management apparatus, and a radio base station that enable optimization control in consideration of a dead zone.
- a radio parameter control apparatus is a radio parameter control apparatus for controlling radio parameters of a radio base station, wherein the radio base station analyzes data measured by a plurality of radio terminals including radio terminals in an idle state. Measurement data analyzing means for detecting a dead area in a wireless cell controlled by the mobile station, and control means for controlling a radio parameter of the radio base station based on information on the dead area.
- a radio parameter control method is a method for controlling radio parameters of a radio base station, wherein the measurement data analyzing means analyzes data measured by a plurality of radio terminals including idle radio terminals, and A dead zone in a radio cell controlled by the radio base station is detected, and a control unit controls radio parameters of the radio base station based on information on the dead zone.
- a network operation management apparatus is a network operation management apparatus that manages a plurality of radio base stations, and analyzes data measured by a plurality of radio terminals including idle radio terminals in the radio base station.
- a measurement data analysis unit that detects a dead area in a radio cell controlled by a radio base station, and a control unit that controls radio parameters of the radio base station based on information on the dead zone.
- a radio base station according to the present invention is a radio base station that controls a radio cell, and analyzes data measured by a plurality of radio terminals including idle radio terminals in the radio cell to detect insensitivity in the radio cell.
- Measurement data analysis means for detecting the ground, and control means for controlling the radio parameters of the own station based on the information on the dead area.
- the dead zone of the cell is detected using the data measured by the radio terminal in the radio cell, and the radio parameters of the base station are controlled based on the information about the dead zone.
- FIG. 1 is a network diagram showing a schematic configuration of a wireless communication system to which an embodiment of the present invention is applied.
- FIG. 2 is a block diagram showing a functional configuration of the radio parameter control system according to the first embodiment of the present invention.
- FIG. 3 is a schematic diagram showing a data configuration example of the measurement data storage unit in the present embodiment.
- FIG. 4 is a flowchart showing a radio parameter control method according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing a radio parameter control method according to the second embodiment of the present invention.
- FIG. 6 is a schematic diagram showing an antenna radiation direction for explaining an example of position-based control in the second embodiment.
- FIG. 7 is a flowchart showing a radio parameter control method according to the third embodiment of the present invention.
- FIG. 1 is a network diagram showing a schematic configuration of a wireless communication system to which an embodiment of the present invention is applied.
- FIG. 2 is a block diagram showing a functional configuration of the radio parameter control system
- FIG. 8A is a schematic diagram showing the configuration of a cell having a dead zone
- FIG. 8B shows a display example of a dead zone for explaining an example of control based on the size in the third embodiment.
- FIG. 9 is a block diagram showing a functional configuration of a radio parameter control system according to the second embodiment of the present invention.
- FIG. 10 is a flowchart showing a radio parameter control method according to the fourth embodiment of the present invention.
- FIG. 11 is a schematic diagram showing an example of a radio parameter change value determination method in the fourth embodiment of the present invention.
- FIG. 12 is a block diagram showing a functional configuration of a network operation management apparatus according to the third embodiment of the present invention.
- FIG. 13 is a block diagram showing a functional configuration of a radio base station according to the fourth embodiment of the present invention.
- the dead zone of the cell is detected using the data measured by the terminal moving in the cell, and the radio parameters of the base station are controlled based on the information about the dead zone. This makes it possible to optimize the base station parameters in consideration of the dead zone.
- embodiments and examples of the present invention will be described in detail using the wireless communication system shown in FIG. 1 as an example.
- a radio parameter control apparatus 10 determines radio parameters optimized for each radio base station 20 using measurement data stored in a measurement data storage unit 11. To do.
- the cell managed by each radio base station 20 includes a terminal in a wireless connection state and a terminal in an idle state.
- the terminal in a connection state reports measurement data to the radio base station in an immediate report mode (Immediate MDT), and is idle.
- the terminal in the state can record the measurement data in the record report mode (Logged MDT), and can report the measurement data to the radio base station when connected wirelessly.
- the dead zone 21 exists in the cell 20a managed by the radio base station 20, and the idle terminal 30 passes through the dead zone 21, and the measurement data at that time (pause acquisition of the measurement log is suspended). It is assumed that the record is later reported to the radio base station 20.
- the plurality of radio cells illustrated in FIG. 1 may be adjacent to each other, or may be a small cell in which one radio cell is provided in another radio cell.
- the terminal is a mobile station or user equipment (User Equipment) that can be wirelessly connected to the radio base station, such as a mobile phone or a portable information terminal.
- User Equipment User Equipment
- the measurement data reported from each terminal as described above is collected by the radio parameter control device 10 including the data measured by each radio base station, and stored in the measurement data storage unit 11.
- the measurement data collection device 12 provided separately from the radio parameter control device 10 may collect measurement data from each radio base station and store it in the measurement data storage unit 11.
- the measurement data storage unit 11 may be provided separately from the wireless parameter control device 10 or may be provided in the wireless parameter control device 10.
- the radio parameter control apparatus 10 may be provided in a network operation management apparatus (not shown) that manages a plurality of radio base stations.
- a network operation management device or SON server can have the functions of the wireless parameter control device 10, the measurement data storage unit 11, and the measurement data collection device 12.
- the radio parameter control device 10 may be provided in the radio base station 20, and the radio base station 20 may have a radio parameter control function.
- a wireless parameter control apparatus 10 includes a measurement data analysis unit 101 and a wireless parameter control unit 102 as functions.
- the measurement data analysis unit 101 acquires the measurement data of the selected cell from the measurement data storage unit 11 and analyzes it, and based on the analysis result, the radio parameter control unit 102 controls the radio parameter of the cell.
- the wireless control device 10 is provided with a computer (CPU: Central Processing Unit) and a storage device for storing a program, the measured electric power and other analysis unit 101 and the wireless parameter control are executed by executing the program on the computer. Functions similar to those of the unit 102 can also be realized.
- FIG. 3 is an example of measurement data.
- the measurement position and measurement time data include the radio signal, the radio access method, the frequency band, and pilot signals (or reference signals) measured by a plurality of terminals. Stored together with the received signal level (received power) and received quality.
- the received signal level is, for example, RSRP (Reference Signal Received Power) in LTE, and RSCP (Received Signal Code Power) in UMTS.
- the reception quality is the received signal quality of the pilot signal (or reference signal) .
- LTE is RSRQ (Reference Signal Received Quality)
- UMTS is Ec / No (The received energy, per chip, divided, by power, density) It is.
- the measurement position is, for example, latitude / longitude, or x, y coordinates in a UTM (Universal Transverse® Mercator) coordinate system or 19 coordinate system, and preferably includes z coordinates (elevation information). Furthermore, the information regarding the reliability of position information may be included. The information on the reliability of the position information includes a confidence interval and a reliability.
- the position can also be estimated using information such as the transmission signal level. Specifically, the path loss between the base station antenna position and the terminal is calculated from the difference between the transmission signal level and the reception signal level. Assuming that this path loss is proportional to the distance between the base station antenna position and the terminal, the position is specified by three-point surveying.
- the position may be estimated using position information measured at a measurement time different from the measurement. For example, the position information acquired immediately before the measurement and the position information acquired immediately after the measurement are used, and the average is set as the position where the measurement is performed.
- the measurement data includes data measured by not only the terminal in the connected state but also the terminal in the idle state.
- the measurement data from the terminal in the idle state can be acquired by the recording report mode function.
- the measurement data analysis unit 101 detects the presence of a dead zone, the geographical characteristics of the dead zone, and the like from the measurement data described above. Based on the analysis result, the radio parameter control unit 102 determines the radio parameter (for example, transmission power) of the cell. , Antenna beam angle such as antenna tilt angle and horizontal beam angle).
- the geographical characteristics of the dead area are specifically the position and size of the dead area.
- the size of the dead area is a time rate (a ratio of time spent in the dead area in the measurement time) or a place ratio (a ratio of the dead area in the entire area).
- the measurement data analysis unit 101 specifies the dead area (first embodiment), detects the position of the dead area (second embodiment), detects the size of the dead area (third embodiment), and detects them.
- the wireless parameter control by the wireless parameter control unit 102 based on the result will be described in detail with reference to the drawings.
- the measurement data analysis unit 101 analyzes the measurement data and grasps the presence of a dead zone.
- the measurement data analysis unit 101 sets the measurement data at the measurement point of the measurement data. Recognize that there is a dead zone. At this time, the radio cell having the highest received signal level of the pilot signal (or reference signal) immediately before entering the dead zone or immediately after exiting the dead zone is recognized as a cell including the dead zone.
- the measurement point of the measurement data includes content where the reception signal level (or reception signal quality) of the pilot signal (or reference signal) is less than a predetermined value for all radio cells, the measurement point of the measurement data It is recognized that there is a dead zone. Also in this case, for each measurement, a radio cell having the highest received signal level of the pilot signal (or reference signal) is recognized as a cell where the dead zone has occurred.
- the wireless parameter control unit 102 determines a change value of the wireless parameter based on the dead area grasped by the measurement data analysis unit 101. For example, when a dead zone occurs in a certain radio cell, the radio parameters are controlled so as to increase the transmission power of the radio cell or move the antenna tilt angle upward (up-tilt). To do.
- the radio parameter control apparatus 10 first selects one radio cell from radio cells under its jurisdiction (operation S201), and uses the radio cell as a serving cell (Serving Cell) or measurement data or a pilot signal of the radio cell. Measurement data having the largest received signal level (or reference signal) is collected (operation S202).
- the measurement data to be acquired may include measurement data measured before and after these measurement data.
- the measurement data analysis unit 101 analyzes the measurement data as described above, thereby grasping the presence of a dead zone in the wireless cell. If a dead zone has occurred (operation S204; YES), the wireless parameter control unit 102 determines a change value of the wireless parameter so as to eliminate the dead zone (operation S205). Specifically, for example, the transmission power of the wireless cell is increased or the antenna tilt angle is uptilted. If there is no dead spot (operation S204; NO), the process is terminated.
- the measurement data analysis unit 101 analyzes the measurement data and grasps the position of the dead area.
- the radio parameter control apparatus 10 acquires measurement data related to the selected radio cell (operations S301 and S302) in the same manner as the operations S201 and S202 of FIG. 4 described above.
- the position of the dead area in the cell is grasped (operation S303). Specifically, position information included in the measurement data is used. If the dead area has a spread, for example, the center of gravity is used as the representative point.
- the wireless parameter control unit 102 considers the position of the dead zone and determines a change value of the wireless parameter so as to eliminate the dead zone ( Operation S305). For example, the antenna tilt angle and / or the horizontal beam angle of the base station antenna is controlled so that the main axis of the base station antenna is directed toward the dead zone. This antenna beam angle control will be described.
- the azimuth (elevation angle ⁇ 1 ) from the base station antenna 20 of the radio cell 20a toward the dead zone 21 is calculated using the following equation:
- (x BS , y BS , z BS ) is the base station antenna position
- (x DS , y DS , z DS ) is the position of the dead zone.
- the horizontal azimuth is 0 degree in the y-axis direction (north) and positive in the x-axis direction (east), and the vertical azimuth is 0 degree in horizontal and positive in the lower part.
- the current antenna tilt angle (elevation angle) (vertical angle at which the antenna gain is maximum) is ⁇ 2 , up tilt if ⁇ 1 ⁇ 2 and down tilt if ⁇ 1 > ⁇ 2 Do.
- the measurement data analysis unit 101 analyzes the measurement data and grasps the size of the dead area.
- the radio parameter control apparatus 10 acquires measurement data related to the selected radio cell (operations S401 and S402), similarly to the operations S201 and S202 of FIG. By analyzing the measurement data, the size of the dead area in the cell is grasped (operation S403).
- the size of the dead area can be grasped by, for example, a time rate (ratio of time spent in the dead area in the measurement time) or a place ratio (ratio of dead area in the entire area).
- operation S404 it is determined whether or not the size of the dead area is equal to or larger than a predetermined value (operation S404). If the size of the dead area is equal to or larger than the predetermined value (operation S404; YES), the same as in the first embodiment. Then, a change value of the wireless parameter is determined so as to eliminate the dead zone (operation S405). Specifically, for example, the transmission power of the wireless cell is increased or the antenna tilt angle is uptilted. If there is no dead spot (operation S404; NO), the process is terminated.
- the wireless parameter control can be performed by combining the position-based control according to the second embodiment and the magnitude-based control according to the third embodiment.
- the measurement data analysis unit 101 uses the time information of the measurement data to obtain the time during which the measurement terminal was present in the dead area (dead area).
- the dead zone time rate obtained by calculating the length of the dead zone time with respect to the total measurement time is used as an index of the size of the dead zone.
- the presence of the dead area, the geographical characteristics of the dead area, and the like are detected from the data measured by the terminal, and the analysis result
- the radio parameters transmission power, antenna beam angle, etc.
- a radio parameter control apparatus 10a includes functions of a measurement data analysis unit 101, a radio parameter control unit 102a, and a received signal level estimation unit 103.
- the measurement data analysis unit 101 is the same as that of the first embodiment shown in FIG.
- the reception signal level estimation unit 103 has a function of estimating the reception signal level after the radio parameter change of the radio cell, and specifically estimates the reception signal level in the dead area after the radio parameter change.
- the radio parameter control unit 102 a generates a change candidate value of the radio parameter of the cell based on the analysis result of the measurement data analysis unit 101, and receives it in the dead zone after the parameter change estimated by the reception signal level estimation unit 103.
- the radio parameter change value is determined with reference to the signal level.
- the measurement data analysis unit 101 specifies the dead zone (first example) and / or detects the position of the dead zone (second example), and the wireless parameter control unit 102a based on the detection results.
- the wireless parameter control (fourth embodiment) according to the above will be described with reference to the drawings.
- the radio parameter control apparatus 10a acquires measurement data related to the selected radio cell, as in the operations S301 to S303 of FIG. (Operations S501 and S502) Subsequently, the measurement data analysis unit 101 analyzes the measurement data to grasp the position of the dead area in the cell (Operation S503).
- the wireless parameter control unit 102a determines a wireless parameter change candidate value in consideration of the position of the dead area (operation S505). For example, candidate values for the antenna tilt angle and / or horizontal beam angle of the base station antenna are determined so that the principal axis of the base station antenna is directed toward the dead zone. These candidate values are passed to the received signal level estimation unit 103.
- the reception signal level estimation unit 103 uses the position information of the dead zone detected by the measurement data analysis unit 101 and the change candidate value of the radio parameter to receive the signal in the dead zone when the radio parameter change candidate value is applied.
- the level is estimated as follows:
- the received signal level in the dead zone before changing the radio parameter is RSRP_0 and the transmission output is changed from the current P_0 to P_1
- the received signal level RSRP_1 in the dead zone is estimated by the following equation as changing by the transmission power change it can.
- RSRP_1 RSRP_0 + (P_1-P_0)
- the radio parameter control unit 102a determines, as a final change value, a radio parameter change candidate value that eliminates the dead zone most, based on the estimated value of the received signal level for all the radio parameter change candidate values (operation). S506). As a result of estimation of the received signal level, if it is found that the dead zone is not resolved (that is, the received signal level of the dead zone does not reach the predetermined value for all change candidate values), the radio parameter There is no need to make changes.
- the method for determining the radio parameter change value will be described using the setting of the tilt angle of the antenna beam as an example.
- radio parameter (antenna beam setting) change candidate i for one measurement data n of measurement data measured in a predetermined cell during a predetermined period, estimation of a received signal level for the antenna beam setting change The value is RSRPn_i.
- the average received signal level for all measurement data measured in a predetermined cell during a predetermined period can be obtained by the following equation.
- the base station 20 has a predetermined antenna gain pattern, and the terminals 31 and 32 are respectively at predetermined positions with respect to the antenna of the base station 20.
- the antenna angle of the base station 20 is ⁇ A
- the antenna angle of the base station 20 is ⁇ B and ⁇ A ⁇ B.
- the received power RSRP1_A of the terminal 31 is very small (that is, a dead zone occurs), and the received power RSRP2_A of the terminal 32 is sufficient.
- the radio parameter change candidate B is set, the received power RSRP1_A of the terminal 31 and the received power RSRP2_A of the terminal 32 are improved to some extent. Therefore, in this case, when the calculation is performed using the index of the above formula, the index value of B is larger than the radio parameter change candidate A as shown in the following formula, and the radio parameter change candidate B is determined as the change value. be able to.
- the presence / absence of a dead zone, the geographical characteristics of the dead zone, and the like are detected from the data measured by the terminal, and based on the analysis result.
- the radio parameter change candidate having the highest effect of dead zone elimination is determined as the change value. This makes it possible to eliminate the dead zone more effectively.
- reception signal level estimation method used in the fourth embodiment, it is also possible to estimate the reception signal level when the radio parameter of the radio cell is changed using the radio wave propagation estimation method. Specifically, statistical methods (such as ⁇ Equation, Sakagami Equation, ITU-R P.1546) and deterministic methods (such as ray tracing method) can be used.
- the network operation management apparatus 600 that manages the radio base stations of the radio communication system includes the radio parameter control apparatus 10 or 10a, the measurement data storage unit 11, and the measurement data collection apparatus 12 described above. May be included. Since the basic operation is the same as in the first to fourth embodiments, description thereof is omitted.
- the radio base station 700 of the radio communication system includes the radio parameter control device 10 or 10a and the measurement data storage in addition to the radio transceiver 13 for radio connection with a radio terminal.
- the unit 11 may further include a measurement data collection device 12. Since the basic operation is the same as in the first to fourth embodiments, description thereof is omitted.
- the present invention is applicable to a system for controlling radio parameters of a base station in a radio communication system.
- Measurement data storage unit 12 Measurement data collection device 20 Radio base station 20a Cell 21, 22 Dead zone 21a, 22a Dead zone grid 30, 31, 32 Terminal 101 Measurement data analysis unit 102, 102a Radio parameter Control unit 103 Received signal level estimation unit
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Abstract
Description
・自己構成(Self-Configuration)
・自己最適化(Self-Optimization)
・自己修復(Self-Healing)
本発明による無線パラメータ制御方法は、無線基地局の無線パラメータを制御する方法であって、測定データ分析手段が、アイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析して前記無線基地局が制御する無線セル内の不感地を検出し、制御手段が、前記不感地に関する情報に基づいて前記無線基地局の無線パラメータを制御する、ことを特徴とする。
本発明によるネットワーク運用管理装置は、複数の無線基地局を管理するネットワーク運用管理装置であって、無線基地局におけるアイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析して前記無線基地局が制御する無線セル内の不感地を検出する測定データ分析手段と、前記不感地に関する情報に基づいて前記無線基地局の無線パラメータを制御する制御手段と、を有することを特徴とする。
本発明による無線基地局は、無線セルを制御する無線基地局であって、前記無線セル内のアイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析し前記無線セル内の不感地を検出する測定データ分析手段と、前記不感地に関する情報に基づいて自局の無線パラメータを制御する制御手段と、を有することを特徴とする。
図2に示すように、本発明の第1実施形態による無線パラメータ制御装置10は、測定データ分析部101および無線パラメータ制御部102を機能として備える。測定データ分析部101は、選択されたセルの測定データを測定データ格納部11から取得して分析し、この分析結果に基づいて、無線パラメータ制御部102は当該セルの無線パラメータを制御する。なお、無線制御装置10にコンピュータ(CPU: Central Processing Unit)およびプログラムを格納する記憶装置が設けられていれば、プログラムをコンピュータ上で実行することにより、上記測定電他分析部101および無線パラメータ制御部102と同様の機能を実現することもできる。
図3は測定データの一例である。図3に例示するように、測定データ格納部11には、測定位置および測定時間のデータが、無線セル、無線アクセス方式、周波数帯域、複数の端末で測定されたパイロット信号(またはリファレンス信号)の受信信号レベル(受信電力)および受信品質と共に格納されている。
測定データ分析部101は、上述した測定データから不感地の存在、不感地の地理的特性等を検出し、この分析結果に基づいて、無線パラメータ制御部102は当該セルの無線パラメータ(たとえば送信電力、アンテナチルト角、水平方向ビーム角などのアンテナビーム角)を制御する。ここで、不感地の地理的特性とは、具体的には不感地の位置、大きさ等のことである。さらに、不感地の大きさとは、時間率(測定時間の中で不感地にいた時間の割合)または場所率(エリア全体の中での不感地の割合)のことである。
本発明の第1実施例による無線パラメータ制御装置10では、測定データ分析部101が測定データを分析し不感地の存在を把握する。
本発明の第2実施例による無線パラメータ制御装置10では、測定データ分析部101が測定データを分析し不感地の位置を把握する。
図6に示すように、無線セル20aの基地局アンテナ20から不感地21に向かう方位(仰俯角θ1)を、次式を用いて算出する
ここで、(xBS, yBS, zBS)は基地局アンテナ位置、(xDS, yDS, zDS)は不感地の位置である。なお、水平方位はy軸性方向(北)を0度としてx軸性方向(東)が正、垂直方位は水平を0度として下方が正である。
本発明の第3実施例による無線パラメータ制御装置10では、測定データ分析部101が測定データを分析し不感地の大きさを把握する。
不感地の大きさを時間率により把握する場合、測定データ分析部101は、測定データの時刻情報を用いて、測定端末が不感地に存在していた時間(不感地時間)を求め、続いて、全測定時間に対する不感地時間の長さを計算することで求めた不感地の時間率を不感地の大きさの指標とする。
図8(A)に示す実際のセル20aに不感地21および22が存在するものとする。また、図8(B)に示すように、不感地の大きさを場所率により把握する場合、測定データ分析部101は、無線セル20aがカバーするエリアをグリッドに分割し、不感地21が所定の個数(または割合)以上発生しているグリッドを求める。図8(A)に示す実際のセル20aに不感地21および22が存在すれば、図8(B)に示すように、それらに対応する不感地グリッド21aおよび22aを特定することができる。したがって、無線セル20aの全エリアのグリッド数に対する不感地グリッド21aおよび22aの各々の個数を不感地の大きさ(場所率)として求めることができる。
以上述べたように、本発明の第1~第3実施例によれば、端末が測定したデータから不感地の存在や不感地の地理的特性等を検出し、この分析結果に基づいて当該セルの無線パラメータ(送信電力やアンテナビーム角など)を制御することで、不感地を効果的に解消することができる。
図9に示すように、本発明の第2実施形態による無線パラメータ制御装置10aは、測定データ分析部101、無線パラメータ制御部102aおよび受信信号レベル推定部103の機能を備える。測定データ分析部101は図1に示す第1実施形態と同様であるから説明は省略する。
図10において、本発明の第4実施例による無線パラメータ制御装置10aは、上述した図5の動作S301~S303と同様に、選択した無線セルに関する測定データを取得し(動作S501、S502)、続いて、測定データ分析部101が測定データを分析することで当該セルにおける不感地の位置を把握する(動作S503)。
以上述べたように、本発明の第4実施例によれば、端末が測定したデータから不感地の有無や不感地の地理的特性等を検出し、この分析結果に基づいて当該セルの無線パラメータ変更候補を算出し、それぞれの変更候補を設定した場合の端末側の受信信号レベルを推定することで、不感地解消の効果が最も高い無線パラメータ変更候補を変更値として決定することができ、より効果的な不感地解消が可能となる。
第4実施例で用いた受信信号レベル推定方法の他に、電波伝搬推定方法を用いて、無線セルの無線パラメータを変更したときの受信信号レベルを推定することもできる。具体的には、統計論的手法(秦式、坂上式、ITU-R P.1546など)や決定論的手法(レイトレーシング法など)を用いることができる。
図12に示すように、無線通信システムの無線基地局を管理するネットワーク運用管理装置600が上述した無線パラメータ制御装置10あるいは10aおよび測定データ格納部11、更に測定データ収集装置12を含んでもよい。基本的な動作は上記第1~第4実施例と同様であるから説明は省略する。
図13に示すように、無線通信システムの無線基地局700は無線端末との無線接続のための無線送受信器13に加えて、上述した無線パラメータ制御装置10あるいは10aおよび測定データ格納部11、更に測定データ収集装置12を含んでもよい。基本的な動作は上記第1~第4実施例と同様であるから説明は省略する。
11 測定データ格納部
12 測定データ収集装置
20 無線基地局
20a セル
21、22 不感地
21a、22a 不感地グリッド
30、31、32 端末
101 測定データ分析部
102、102a 無線パラメータ制御部
103 受信信号レベル推定部
Claims (33)
- 無線基地局の無線パラメータを制御する無線パラメータ制御装置であって、
アイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析して前記無線基地局が制御する無線セル内の不感地を検出する測定データ分析手段と、
前記不感地に関する情報に基づいて前記無線基地局の無線パラメータを制御する制御手段と、
を有することを特徴とする無線パラメータ制御装置。 - 前記無線パラメータを変更したときの前記無線セルにおける無線品質を推定する推定手段を更に有し、前記制御手段は前記推定された無線品質に基づいて前記無線パラメータの変更値を決定することを特徴とする請求項1に記載の無線パラメータ制御装置。
- 前記制御手段は前記不感地に関する情報に基づいて少なくとも1つの無線パラメータ変更候補値を生成し、
前記推定手段は前記無線パラメータ変更候補値について無線品質を推定し、
前記制御手段は前記推定された無線品質に基づいて前記無線パラメータの変更値を決定する、
ことを特徴とする請求項2に記載の無線パラメータ制御装置。 - 前記測定データ分析手段は前記測定データを用いて前記不感地の地理的特性を検出することを特徴とする請求項1-3のいずれか1項に記載の無線パラメータ制御装置。
- 前記不感地の地理的特性は前記不感地の位置情報および/または前記不感地の大きさであることを特徴とする請求項4に記載の無線パラメータ制御装置。
- 前記不感地の位置情報は、前記測定とは別の測定時刻に測定された位置情報を用いて特定することを特徴とする請求項5に記載の無線パラメータ制御装置。
- 前記不感地の大きさは前記無線端末が測定時間の中で前記不感地にいた時間の割合または前記無線セル全体の中での前記不感地の割合に基づく値であることを特徴とする請求項5に記載の無線パラメータ制御装置。
- 前記制御手段は前記無線パラメータにより前記無線基地局の送信電力および/またはアンテナチルト角を制御することを特徴とする請求項1-7のいずれか1項に記載の無線パラメータ制御装置。
- 無線基地局の無線パラメータを制御する方法であって、
測定データ分析手段が、アイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析して前記無線基地局が制御する無線セル内の不感地を検出し、
制御手段が、前記不感地に関する情報に基づいて前記無線基地局の無線パラメータを制御する、
ことを特徴とする無線パラメータ制御方法。 - 推定手段が、前記無線パラメータを変更したときの前記無線セルにおける無線品質を推定し、
前記制御手段が、前記推定された無線品質に基づいて前記無線パラメータの変更値を決定する、
ことを特徴とする請求項9に記載の無線パラメータ制御方法。 - 前記制御手段が前記不感地に関する情報に基づいて少なくとも1つの無線パラメータ変更候補値を生成し、
前記推定手段が前記無線パラメータ変更候補値について無線品質を推定し、
前記制御手段が前記推定された無線品質に基づいて前記無線パラメータの変更値を決定する、
ことを特徴とする請求項10に記載の無線パラメータ制御方法。 - 前記測定データ分析手段が前記測定データを用いて前記不感地の地理的特性を検出する、ことを特徴とする請求項9-11のいずれか1項に記載の無線パラメータ制御方法。
- 前記不感地の地理的特性は、前記不感地の位置情報および/または前記不感地の大きさであることを特徴とする請求項12に記載の無線パラメータ制御方法。
- 前記不感地の位置情報は、前記測定とは別の測定時刻に測定された位置情報を用いて特定することを特徴とする請求項13に記載の無線パラメータ制御方法。
- 前記不感地の大きさは前記無線端末が測定時間の中で前記不感地にいた時間の割合または前記無線セル全体の中での前記不感地の割合に基づく値であることを特徴とする請求項13に記載の無線パラメータ制御方法。
- 前記制御手段が前記無線パラメータにより前記無線基地局の送信電力および/またはアンテナチルト角を制御する、ことを特徴とする請求項9-15いずれか1項に記載の無線パラメータ制御方法。
- 複数の無線基地局を管理するネットワーク運用管理装置であって、
無線基地局におけるアイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析して前記無線基地局が制御する無線セル内の不感地を検出する測定データ分析手段と、
前記不感地に関する情報に基づいて前記無線基地局の無線パラメータを制御する制御手段と、
を有することを特徴とするネットワーク運用管理装置。 - 前記無線パラメータを変更したときの前記無線セルにおける無線品質を推定する推定手段を更に有し、前記制御手段は前記推定された無線品質に基づいて前記無線パラメータの変更値を決定することを特徴とする請求項17に記載のネットワーク運用管理装置。
- 前記制御手段は前記不感地に関する情報に基づいて少なくとも1つの無線パラメータ変更候補値を生成し、
前記推定手段は前記無線パラメータ変更候補値について無線品質を推定し、
前記制御手段は前記推定された無線品質に基づいて前記無線パラメータの変更値を決定する、
ことを特徴とする請求項18に記載のネットワーク運用管理装置。 - 前記測定データ分析手段は前記測定データを用いて前記不感地の地理的特性を検出することを特徴とする請求項17-19のいずれか1項に記載のネットワーク運用管理装置。
- 前記不感地の地理的特性は前記不感地の位置情報および/または前記不感地の大きさであることを特徴とする請求項20に記載のネットワーク運用管理装置。
- 前記不感地の位置情報は、前記測定とは別の測定時刻に測定された位置情報を用いて特定することを特徴とする請求項21に記載のネットワーク運用管理装置。
- 前記不感地の大きさは前記無線端末が測定時間の中で前記不感地にいた時間の割合または前記無線セル全体の中での前記不感地の割合に基づく値であることを特徴とする請求項21に記載のネットワーク運用管理装置。
- 前記制御手段は前記無線パラメータにより前記無線基地局の送信電力および/またはアンテナチルト角を制御することを特徴とする請求項17-23のいずれか1項に記載のネットワーク運用管理装置。
- 無線セルを制御する無線基地局であって、
前記無線セル内のアイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析し前記無線セル内の不感地を検出する測定データ分析手段と、
前記不感地に関する情報に基づいて自局の無線パラメータを制御する制御手段と、
を有することを特徴とする無線基地局。 - 前記無線パラメータを変更したときの前記無線セルにおける無線品質を推定する推定手段を更に有し、前記制御手段は前記推定された無線品質に基づいて前記無線パラメータの変更値を決定することを特徴とする請求項25に記載の無線基地局。
- 前記制御手段は前記不感地に関する情報に基づいて少なくとも1つの無線パラメータ変更候補値を生成し、
前記推定手段は前記無線パラメータ変更候補値について無線品質を推定し、
前記制御手段は前記推定された無線品質に基づいて前記無線パラメータの変更値を決定する、
ことを特徴とする請求項26に記載の無線基地局。 - 前記測定データ分析手段は前記測定データを用いて前記不感地の地理的特性を検出することを特徴とする請求項25-27のいずれか1項に記載の無線基地局。
- 前記不感地の地理的特性は前記不感地の位置情報および/または前記不感地の大きさであることを特徴とする請求項28に記載の無線基地局。
- 前記不感地の位置情報は、前記測定とは別の測定時刻に測定された位置情報を用いて特定することを特徴とする請求項29に記載の無線基地局。
- 前記不感地の大きさは前記無線端末が測定時間の中で前記不感地にいた時間の割合または前記無線セル全体の中での前記不感地の割合に基づく値であることを特徴とする請求項29に記載の無線基地局。
- 前記制御手段は前記無線パラメータにより前記無線基地局の送信電力および/またはアンテナチルト角を制御することを特徴とする請求項25-31のいずれか1項に記載の無線基地局。
- 無線基地局の無線パラメータを制御する無線パラメータ制御装置としてコンピュータを機能させるプログラムであって、
アイドル状態の無線端末を含む複数の無線端末で測定されたデータを分析して前記無線基地局が制御する無線セル内の不感地を検出する測定データ分析機能と、
前記不感地に関する情報に基づいて前記無線基地局の無線パラメータを制御する制御機能と、
を前記コンピュータで実現することを特徴とするプログラム。
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