WO2010067560A1 - 電波環境データ補正システム、方法およびプログラム - Google Patents
電波環境データ補正システム、方法およびプログラム Download PDFInfo
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- WO2010067560A1 WO2010067560A1 PCT/JP2009/006625 JP2009006625W WO2010067560A1 WO 2010067560 A1 WO2010067560 A1 WO 2010067560A1 JP 2009006625 W JP2009006625 W JP 2009006625W WO 2010067560 A1 WO2010067560 A1 WO 2010067560A1
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- the present invention relates to a radio wave environment data correction system, a radio wave environment data correction method, and a radio wave environment data correction program for correcting radio wave environment data in an area around a base station of a wireless communication system, and in particular, limited measurement within the area.
- the present invention relates to a radio wave environment data correction system, a radio wave environment data correction method, and a radio wave environment data correction program for correcting radio wave environment data using measured data at points.
- a base station In order to appropriately design a serviceable area (service area) of a wireless communication system such as a mobile phone or a wireless LAN, a base station to be designed (including a base station in a mobile phone and an access point in a wireless LAN) It is necessary to correctly grasp the radio wave environment characteristics when the device is installed at a predetermined position and with predetermined parameters. In order to realize this, a radio wave propagation simulator is used. By using a radio wave propagation simulator to determine the installation location and parameters of the base station while evaluating the received electric field strength and delay spread at an arbitrary observation point, an appropriate service area can be designed.
- Radio wave propagation simulation is broadly divided into statistical methods and deterministic methods.
- the statistical method gives an estimation formula for propagation loss with arguments such as the distance from the base station to a predetermined position and frequency, and empirical parameters of the estimation formula based on a lot of actually measured propagation loss data. It is a technique to give to.
- the estimated value can be corrected using an average state of the features around the transmission point and the reception point.
- the average condition of the feature includes, for example, a building occupation area ratio and an average building height.
- Examples of statistical methods include the Okumura-Sakai model and the Sakagami model. Details of the Okumura-Sakai model and Sakagami model are disclosed in Non-Patent Document 1.
- the deterministic method is a method that faithfully considers the influence of surrounding objects when estimating the radio wave propagation state from the transmission point to the observation point.
- the building map data and elevation map data are used to model objects such as building information and terrain information that affect radio wave propagation.
- the radio wave propagation state is estimated while faithfully considering the influence of reflection and transmission by the object.
- An example of a deterministic method is the ray tracing method.
- the ray-tracing method considers radio waves radiated from an antenna as a collection of many radio waves (rays), and synthesizes the rays that reach the observation point as each ray propagates while repeating reflection and transmission geometrically. This is a technique for obtaining propagation loss and delay amount. Details of the ray tracing method are disclosed in Non-Patent Document 2.
- an error (estimation error) with respect to the radio wave environment data when the base station is actually installed under the same conditions as the simulation occurs.
- the statistical method statistical effects that are empirically obtained in one environment are applied to another environment to determine the influence of surrounding objects on radio waves, which may cause large estimation errors due to environmental differences. is there.
- the deterministic method can estimate the influence of the object deterministically more accurately than the statistical method, but if there is an error in the building map data or layout data used as the object information, the estimation error Will occur.
- Patent Document 1 stores measurement data of desired wave reception power, obtains a correction value for each predetermined direction of the propagation curve from a difference between the measurement data and a propagation curve based on a statistical method, and this correction value A method is disclosed in which the propagation curve is corrected using the, and the propagation state of the radio wave is simulated using the corrected propagation curve.
- the propagation curve for example, the Okumura-Kashiwa model is used.
- the correction of the propagation curve is performed, for example, by correcting the building occupation area ratio.
- the building occupation area ratio correction value is calculated at every predetermined angle (for example, every 2 degrees) in all directions around the radio base station, and the propagation situation of radio waves is simulated using the corrected propagation curve for each angle. It is a thing to do.
- Patent Document 2 There is a method disclosed in Patent Document 2 as another method for correcting the radio wave environment data estimated using the actual measurement data.
- the difference between the measured propagation loss measured at a plurality of points and the estimated propagation loss calculated using the propagation model is obtained, and the virtual height for each feature is adjusted so that this difference is reduced.
- Virtual height is one of the functions given in the radio wave propagation simulator “NetPlan (registered trademark)” developed by the applicant of Patent Document 2, and is assumed for each feature on the ground surface. It is a typical height. A propagation loss is estimated using this virtual height.
- Patent Documents 1 and 2 have a difference between a method of correcting a building occupation area ratio as a correction target and a method of correcting a virtual height, both methods are actually measured around a base station. Correction is applied to the area of the azimuth where the data exists. As a result, radio wave environment data in which correction is added is given to the area having the same direction as the direction in which the measured data is present.
- Patent Documents 1 and 2 are effective when a propagation estimation error occurs in an area in the same direction centered on the base station. For example, it is assumed that the measured electric field strength is about 10 dB higher at any point in the area of a certain direction from the base station, even if the measured electric field strength is compared with the estimated electric field strength. In such a case, if the electric field strength is measured at some points in the area, the accuracy is improved over the entire area by correcting the difference from the estimated electric field strength at the measurement point. be able to.
- the measured electric field strength is 10 dB higher than the estimated electric field strength at a certain point A, but at another point B, the measured electric field strength is 5 dB higher than the estimated electric field strength. Assume low. In such a situation, when the measurement for correction is performed only at the point A, the correction at the point B is performed in the direction opposite to the measured value, and the error further increases.
- this situation is likely to occur in urban areas where buildings are densely populated or indoors where objects are arranged in a complex manner. That is, the same error does not necessarily occur in an area with the same orientation centered on the base station. Rather, the same error is more likely to occur when the land use division such as the same road is used outdoors and the indoor use division such as the same corridor or room is the same indoors.
- FIG. 21 illustrates the propagation state of some radio wave components radiated from the transmission point 100.
- the radio wave component 301 radiated from the transmission point 100 first collides with the building 201 and is reflected, and then collides with the buildings 202 and 203 in order and propagates through the road 400.
- a road plays a role of a radio wave waveguide, and radio waves often propagate along the road as in the example of the radio wave component 301.
- the radio wave component 301 is estimated not to propagate on the road 400.
- the estimated received electric field strength on the road 400 is uniformly lower than the actual measurement.
- This situation also occurs in indoor radio wave propagation. That is, when the corridor or the room acts like a wave waveguide, uniform estimation errors are likely to occur in the same corridor or the same room.
- the radio wave component 302 radiated from the transmission point 100 is diffracted at the edge of the building 203, passes through the street tree 204, and reaches the road 400.
- the roadmap is estimated to be higher than the transmission loss due to the roadside trees.
- road trees uniformly exist on the road as in the example of FIG. 21, and therefore the estimated received electric field strength on the road is uniformly higher than the actual measurement.
- the present invention has been made to solve the above-described problems, and correction of radio wave environment data using measured data at measurement points in the base station peripheral area of the wireless communication system is limited.
- the purpose is to perform more accurately at the measurement point.
- the radio wave environment data correction system divides a base station peripheral area (evaluation area) based on an area use category that is a predetermined category according to an object or space layout in the base station peripheral area of a wireless communication system.
- a correction value for determining a correction value for correcting radio wave environment data which is information indicating radio wave environment characteristics in the area around the base station, based on actual measurement data at measurement points belonging to the sub area.
- a determining means is provided.
- the radio wave environment data correction method provides a base station peripheral area (evaluation area) based on an area use classification that is a predetermined classification according to the layout of an object or space in the base station peripheral area of a wireless communication system.
- a correction value for correcting radio wave environment data which is information indicating radio wave environment characteristics in the area around the base station, is determined based on measured data at measurement points belonging to the sub area. It is characterized by that.
- the radio wave environment data correction program allows a computer to execute a base station peripheral area (evaluation area) based on an area use category that is a predetermined category according to an object or space layout in the base station peripheral area of a wireless communication system. ) Is determined based on the measured data at the measurement points belonging to the sub area, and correction values for correcting the radio environment data, which is information indicating the radio environment characteristics in the area surrounding the base station, are determined. It is characterized in that the processing is performed.
- the measurement man-hours for correction can be greatly reduced as compared with the conventional method, and the efficiency of the service area design work of the wireless communication system is achieved.
- FIG. 1 is a block diagram showing a configuration example of a radio wave environment data correction system according to the first embodiment of the present invention.
- the radio wave environment data correction system of the present embodiment includes an estimation database 10, a base station database 15, an actual measurement database 20, a map database 30, a sub-area dividing unit 40, a correction value calculation unit 50, and a radio wave environment correction unit. 60, a control unit 70, and a memory 80.
- the estimation database 10 (hereinafter referred to as the estimation DB 10) stores radio wave environment data and base station information before correction. Specifically, at observation points discretized with a predetermined (for example, every 10 m) grid, the latitude and longitude (or XY coordinates), altitude (or ground height) of each observation point, and radio wave propagation simulation were calculated. Data indicating radio wave environment characteristics such as received electric field strength from a neighboring base station, and identification information of a base station serving as a transmission source of the received electric field strength are stored. Note that the radio wave environment data may include data such as a delay profile and an arrival direction in addition to the received electric field intensity. Further, as the above-described radio wave propagation simulation method, it is preferable to use a ray tracing method that has a reputation for simulation in urban areas where the present invention functions particularly effectively.
- the base station database 15 (hereinafter referred to as the base station DB 15) stores parameter information of base stations including a base station that is a transmission source of the received electric field strength stored in the estimation DB 10. Specifically, base station identification information, latitude and longitude (or XY coordinates) of the location, altitude (or surface height), transmission output, antenna horizontal and vertical orientation, parameters such as antenna gain pattern, etc. Is stored.
- the actual measurement database 20 (hereinafter referred to as the actual measurement DB 20) stores actual measurement data in an actual field. Specifically, the latitude / longitude (or XY coordinate system), altitude (or surface height) of the measurement point, the actually measured received field strength, the identification information of the base station that is the transmission source of the received field strength, and the like are stored.
- the map database 30 stores map data including information (shape, position, etc.) on features such as buildings.
- the map data preferably includes information on roads (shape, position, etc.) and information on city blocks (range, type, position, etc.).
- polygon data representing features, line data representing roads with line segments, polygon data representing city blocks, and the like may be stored including coordinate information.
- the sub-area dividing unit 40, the correction value calculating unit 50, and the radio wave environment correcting unit 60 are execution modules or libraries for processing data extracted from the estimation DB 10, the actual measurement DB 20, and the map DB 30, but more specifically. Is an execution module or library that executes some processing as a result of control by the control unit 70 described later.
- the sub-area dividing unit 40 has performed some processing, specifically, it indicates that the execution module or library of the corresponding part in the sub-area dividing unit 40 has been executed under the control of the control unit 70. Shall. Specific processing contents will be described later.
- the control unit 70 is a CPU that controls the operations of the sub-area dividing unit 40, the correction value calculating unit 50, and the radio wave environment correcting unit 60.
- the memory 80 functions as a working memory.
- the estimation database 10, the base station database 15, the actual measurement database 20, and the map database 30 are realized by a database system including, for example, a storage device and a control device that controls access to the storage device. Is done.
- the sub-area dividing unit 40, the correction value calculating unit 50, the radio wave environment correcting unit 60, and the control unit 70 are realized by, for example, a program and a CPU that operates according to the program.
- the memory 80 is realized by a storage device, for example.
- FIG. 2 is a flowchart showing an example of the operation of the radio wave environment data correction system of the present embodiment.
- the field strength of the measurement DB 20 and the field strength of the map DB 30 are calculated based on the field strength of the estimation DB 10, which is a limited field evaluation area (for example, 2 ⁇ 2 km 2 ) A method for correcting using map data will be described.
- the map data in the evaluation area extracted from the map DB 30 is used to divide the evaluation area into sub-areas according to the land use classification that is the outdoor area use classification (Ste S10).
- the land use classification represents how the land is used.
- the land use classification of the Geographical Survey Institute it is classified as described in Non-Patent Document 3.
- classification is performed at a micro level as described later.
- how the land is used is classified according to the features and spaces (vacant land, roads, etc.) in the land, that is, according to geography, as the land use classification in the present invention.
- the land use classification in the present invention is an area use classification that is a classification determined in advance according to the layout of an object or space that affects radio wave propagation in the area.
- the evaluation area 500 includes feature (building) data such as a building 210, road data such as a road 600, and block data such as a block 700. Further, the star mark indicates the base station 101 as a transmission source.
- the area inside the feature is set as one sub-area within the feature for each feature.
- the area surrounded by the building 210 is the feature sub-area 210.
- an area outside the feature and inside the block is set as one sub-area within each block for each block.
- the area outside the building and surrounded by the block 700 is the block sub-area 700.
- an area outside a building or a block and on a specific road among all roads and an area in contact with the area are defined as one road sub-area for each road.
- an area outside a building or a block and an area on the road 600 (area on the line data) and an area in contact with the area (area included according to the road width) among all roads are roads. It becomes a sub-area 600.
- the road sub-areas where the end points of the road line data match each other are combined into one sub-area if the angle difference between both roads is within a predetermined range (for example, within 30 degrees). It does not matter.
- the road subarea 601 and the road subarea 602 may be combined into one road subarea.
- the road subarea 603 may be separate road subareas on the east side and the west side of the base station. Further, one road subarea within 100 m from the base station may be used as another road subarea.
- step S10 The processing in step S10 described above is performed by the sub-area dividing means 40.
- step S20 one of the sub-areas divided in step S10 is extracted (step S20).
- step S30 it is determined whether all the extraction target actual measurement data in the actual measurement DB 20 has been extracted.
- the extraction target actual measurement data means that the position of the measurement point is within the sub-area extracted in step S20, and the base station that is the transmission source of the received electric field strength matches the base station that is the target of this correction processing. This is actually measured data. If it is determined in step S30 that all extraction target actual measurement data has been extracted, the process jumps to step S70. If it is determined in step S30 that all the extraction target actual measurement data has not been extracted, one actual measurement data is extracted from the extraction target actual measurement data from the actual measurement DB 20 (step S40).
- step S50 an observation point in the vicinity of the measurement point extracted in step S40 is extracted, and estimated data at the observation point is extracted (step S50). Further, if the altitude (or ground height) of the actually measured data extracted in step S40 and the altitude (or ground height) of the estimated data extracted in step S50 are the same or close (for example, the difference is within 1 m), both The received electric field strength difference is calculated (step S60).
- step S50 one observation point nearest to the measurement point extracted in step S40 may be extracted, or within a predetermined distance (for example, 30 m) from the measurement point extracted in step S40.
- a plurality of observation points may be extracted.
- an averaging process is performed to calculate one difference for one actually measured data. In that case, you may use a value that is simply average of multiple differences, or use an average value weighted by the reciprocal of the distance between the measurement point and the observation point in order to give priority to the observation point that is close to the measurement point. May be.
- step S60 ends, the determination in step S30 is performed again.
- the correction value of the subarea is calculated using the difference calculated in step S50 (step S70).
- the correction value may be calculated by simply averaging the plurality of differences calculated in step S50.
- the sub area when there is a group of actually measured data at a distant position inside the sub area, the sub area may be divided into a plurality of sub areas, and different correction values may be given to the sub areas. Such an example will be described with reference to FIG.
- FIG. 4 shows a position where the actual measurement data group A (white circle) including the actual measurement data 2001 and the actual measurement data group B (black circle) including the actual measurement data 2002 are separated in the subarea 1000. It is an example when it exists.
- an area in the vicinity of the actual measurement data group A (for example, an area at a predetermined distance (for example, 100 m) from the center of gravity of the actual measurement data group) is set as a subarea 1001, and the sub The area correction value is calculated.
- the vicinity area of the actual measurement data group B is a sub-area 1003, and a correction value is calculated based on the difference in the actual measurement data in the actual measurement data group B. In these cases, the differences calculated at a plurality of actual measurement points may be simply averaged.
- an area that is not in the vicinity of either the measured data group A or B is the sub-area 1002 or 1004, and the correction value in these sub-areas is calculated from the correction value in the sub-area 1001 and the correction value in 1003.
- a value obtained by simply averaging both correction values may be used, or the distance from the center of gravity of the sub-area 1002 to the center of gravity of the sub-areas 1001 and 1003 is calculated. You may use the average value weighted with the reciprocal number.
- steps S20 to S70 described above is performed by the correction value calculation means 50.
- FIG. 5 is an explanatory diagram for explaining a correction method for observation points inside the sub-area.
- the example shown in FIG. 5 is an example in the case where there are actually measured data (black circles) such as the actually measured data 2100 and 48 observation points (white circles) in the sub-area 1100.
- the correction value calculated in step S70 may be given to all observation points in the sub-area.
- the correction value is applied as it is in the case of a short distance, and the correction degree is reduced as the distance increases. May be.
- the correction value is 10 dB
- the correction value of 10 dB is applied as it is to the observation point whose X coordinate is 0 to 5
- the X coordinate is applied to the observation point whose X coordinate is 6 or later.
- the correction value is corrected so that the correction value approaches 10 dB to 0 dB.
- the correction value is given only to observation points within a predetermined distance (for example, 10 m) from the measurement points among the observation points in the sub-area, and for observation points near the measurement point, Since the actually measured value is known, the actually measured received electric field strength may be used as the estimated received electric field strength as it is.
- the correction value of the subarea is calculated based on the correction value of the neighboring subarea.
- the correction value of the subarea that is the same type of land use classification as the target subarea and whose center of gravity is closest to the center of gravity of the target subarea may be used as it is.
- the average value of the target subarea weighted by the reciprocal of each distance may be used as the correction value.
- step S90 it is determined whether or not the processing from steps S30 to S80 has been completed for all subareas. If the processing has not been completed for all subareas, step S20 is performed. Returning to, the remaining sub-area is extracted, and the processing from step S30 to S80 is performed. If the processing has been completed for all the sub-areas in step S90, the correction processing ends.
- the estimation data, the actual measurement data, and the map data are all stored in the database format. However, some or all of these data may be stored in a format other than the database such as a file. Absent.
- the sub-area dividing unit 40 calculates a distance (dn) from a certain evaluation point provided in the evaluation area to the road n.
- the distance from the evaluation point to the road is a distance that minimizes the distance from the evaluation point to a point on the line segment of the road.
- This distance calculation process is performed for all roads, and the road (m) having the minimum distance is extracted. Further, this road extraction processing may be performed for all evaluation points and divided into road sub-areas.
- FIG. 6 is an explanatory diagram showing an example of a result of applying this method to the evaluation area 500 shown in FIG.
- the road is divided into road sub-areas 600, 601, 602, and 603 as distinguished from each other by shading display.
- the division into road sub-areas can also be realized by the following method.
- This method (hereinafter referred to as the second division method) is also an effective method when there is no road line data.
- 7 to 10 are explanatory diagrams for explaining the second division method.
- FIGS. 7 and 8 in order to distinguish between indoor observation points and outdoor observation points, the indoor observation points are shaded on the grid.
- a straight line with an angle ⁇ is first drawn around true north.
- indoor / outdoor determination is performed at an observation point in the vicinity of a straight line obtained by the following equation (1), and a distance (d ⁇ ) in a range that is continuously outdoor from the observation point A is calculated.
- the coordinates of the observation point A in the evaluation area are indicated as (x a , y a ).
- FIG. 8 is an explanatory diagram showing an example of the search order of outdoor observation points in the second division method.
- FIG. 9 is a flowchart showing an example of a procedure for dividing road sub-areas at the outdoor observation point A in the second division method. As shown in FIG. 9, when an outdoor observation point A to be processed is first set according to the search order shown in FIG.
- the road angle in the combined road block may be an average of the road angles of the observation points that are members.
- FIG. 10 is an explanatory diagram showing an example in which a road block is divided into two according to the positional relationship with the base station.
- Fig.10 (a) is explanatory drawing which shows the example of the road block before a division
- FIG.10 (b) is explanatory drawing which shows the example which divided
- an intersection of an intersection with a perpendicular line dropped from the base station (white circle) to the road line and the observation point Division may be performed by examining the positional relationship and determining the positional relationship indicated by the result by the following determination formula (3).
- the coordinates of the base station in the evaluation area are (x b , y b ), and the coordinates of the observation point are (x a , y a ).
- FIG. 10 shows an example in which road subgroup A is divided into road subgroup A1 and road subgroup A2.
- FIG. 11 is an explanatory view showing a simulation result in the case where the radio wave environment data correction method according to the present invention is applied in comparison with the conventional method.
- FIG. 11 shows an evaluation of how much RMSE (root mean square error) is improved when radio wave propagation estimation by the ray tracing method is corrected with actual measurement data. This evaluation was conducted in urban areas.
- the ratio of known measured points on the horizontal axis is the ratio of measured data (known measured data) used for correction when the measured data on all roads exceeding 5 m in width within the target area is 100%.
- FIG. 12A shows a state in which actually measured data measured on all roads is used for correction.
- FIG. 12A shows a state in which actually measured data measured on all roads is used for correction.
- FIG. 12 is an explanatory diagram showing an example of known actual measurement points and unknown actual measurement points in the target area.
- the ratio of the known actual measurement points is 100%.
- the ratio of the known actual measurement points is 50%.
- the vertical axis indicates the average RMSE improvement amount when the correction actual measurement data is extracted in various patterns with respect to the ratio of the predetermined known actual measurement points.
- the required value of the RMSE improvement amount is set to ⁇ 2 dB, as shown in FIG. 11, in the conventional method of correcting based on the direction with respect to the base station (hereinafter referred to as the conventional method 1), an actual measurement of about 21%. Whereas data was required, the usage according to the invention allowed this to be reduced to 12%. That is, according to the present invention, the amount of actual measurement data used for correction can be reduced by 40% compared to the conventional method 1, and therefore the man-hour required for actual measurement can be reduced accordingly.
- the correction method for the received electric field strength is described as an example of the radio wave environment data.
- the propagation loss, signal-to-noise ratio (SNR), and signal-to-buffer ratio that can be calculated based on the received electric field strength are described. Similar processing can be performed for parameters such as (SIR).
- FIG. 13 is an explanatory diagram illustrating an example of a correction method for the delay profile. As shown in FIG. 13, it is assumed that there is an actual measurement point (black circle in FIG. 13) on a certain road block and the profile at that point has the shape shown in the upper right. At this time, the delay profile at the observation point (marked with x in FIG. 13) on the road block may be corrected as follows.
- the distance d1 between the base station and the measurement point and the distance d2 between the base station and the observation point are obtained, and using these, the delay times t1 ′ and t2 in the delay profile of the observation point are obtained by the following equation (4).
- S1, S2, and S3 indicate relative reception levels at delay times t1, t2, and t3 in the delay profile at the actual measurement point.
- S ′ indicates the received electric field intensity after correction at the observation point.
- this method may be applied using the actual measurement point closest to the observation point.
- FIG. 14 is a block diagram illustrating a configuration example of a radio wave environment data correction system according to the second embodiment.
- the radio wave environment data correction system of this embodiment includes a correction value database 90 in addition to the elements shown in the first embodiment shown in FIG.
- the correction value database 90 (hereinafter referred to as correction value DB 90) stores correction value data obtained by the correction method according to the present invention.
- the correction value DB 90 stores the obtained correction value information in association with the information on the subarea to which the correction value is applied and the information on the parameter of the base station when the correction value is obtained. .
- the identifier of the sub area, the correction value in the sub area, the parameter of the base station when the correction value is calculated, and the like may be stored in association with each other.
- FIG. 15 is a flowchart showing an example of the operation of the radio wave environment data correction system of this embodiment.
- the received electric field strength having a limited (for example, 2 ⁇ 2 km 2 ) outdoor evaluation area and a predetermined base station in the estimation DB 10
- the measured data of the measured DB 20 and the map DB 30
- a method for correcting using map data and correction value data of the correction value DB 90 will be described.
- step S10 to step S20 is as described in the operation in the first embodiment.
- the correction value DB is searched to determine whether correction value data applicable to the correction process is stored (step S25).
- the correction value data applicable to the correction processing means that the sub area of the correction value data is equal to the sub area extracted in step S20, and the parameters of the base station of the correction value data (particularly, the installation position, transmission output, antenna) Is the correction value data when the parameter is equal to or close to the parameter of the base station to be corrected.
- the parameter of the base station of the correction value data is close to the parameter of the base station to be subjected to the correction processing, for example, the latitude / longitude (or XY coordinates) of the arrangement position, the altitude (or the surface height), the transmission output, A case where the horizontal direction azimuth of the antenna and the antenna gain pattern are the same but the vertical direction azimuth of the antenna is different within 5 degrees but is partially different but the difference is within a predetermined range. .
- step S25 When there is correction value data applicable to the correction process of the base station in the correction process in step S25, the process jumps to step S80, and the correction process is performed on the observation points in the target subarea. If there is no applicable correction value data in step S25, steps S30 to S70 are performed as in the first embodiment to calculate a correction value. Further, the calculated correction value is stored in the correction value DB 90 (step S75). Thereafter, the correction process of step S80 is performed. The above processing is applied to all subareas.
- the presence / absence of correction value data is determined for each sub-area extracted in step S20. However, this determination process may be performed before sub-area division (before step S10).
- the correction value data in the correction value DB 90 is applied to all subareas when the parameter of the base station in the correction value data matches or is close to the parameter of the base station that is the target of this correction processing. To do.
- the correction value is calculated by the same operation as that described in the first embodiment, and the calculated correction value is stored in the correction value DB 90.
- the estimation data, the actual measurement data, the map data, and the correction value data are all stored in the database format. However, some or all of these data are stored in a format other than the database such as a file. It does not matter.
- correction value once calculated is stored in the correction value DB 90, there is an advantage that it is not necessary to calculate the correction value again for the estimated data under the same conditions.
- correction can be performed by applying a correction value calculated under close conditions.
- a correction value is calculated with respect to the current parameter setting and stored in the correction value DB 90, whereby a part of the base station parameters (for example, the vertical of the antenna)
- the above-described correction value can be applied to the radio wave propagation estimation result when the direction is changed. As a result, it is possible to improve the estimation accuracy even for conditions where measured data does not exist.
- FIG. 16 is a block diagram illustrating a configuration example of a radio wave environment data correction system according to the third embodiment.
- the map database 30 is replaced with a layout database 31 for each element shown in the first embodiment shown in FIG.
- the evaluation area is for the outdoors, but the present embodiment is for indoors.
- the layout database 31 (hereinafter referred to as layout DB 31) stores layout data that is information related to the layout inside the building.
- the layout data preferably includes information (shape, position, etc.) related to objects such as furniture and furniture constituting the layout, and information (shape, position, etc.) related to the hallway and stairs.
- polygon data representing objects such as furniture and furniture, line data representing hallways and stairs with line segments, polygon data representing rooms, and the like may be stored including coordinate information.
- FIG. 17 is a flowchart showing an example of the operation of the radio wave environment data correction system of this embodiment. Referring to FIG. 17, the received electric field strength having the estimation area inside the predetermined building and the predetermined base station as the transmission source in the estimation DB 10 is corrected using the actual measurement data of the actual measurement DB 20 and the layout data of the layout DB 31. A technique for doing this will be described.
- the evaluation area is divided into sub-areas according to the indoor use division that is an indoor area use division (step S11).
- the indoor usage classification is a classification of how the indoor area is used according to the state of objects and spaces (corridors, stairs, etc.) in that area. It is applied indoors.
- the area inside the object is set as one sub-area within each object for each object.
- an area outside the object and inside the room is set as one in-room subarea for each room.
- an area outside the object or room and on a specific corridor or staircase of all the roads and an area in contact with the area is defined as one corridor / stair subarea for each corridor / room.
- division method into the road sub-area in the first embodiment already described can be applied to the division method into the corridor / stairs sub-area.
- both sub-areas are combined. And it does not matter as one sub-area.
- a single corridor / staircase subarea may be divided into a plurality of areas depending on the direction and distance from the base station.
- Processing after step S20 is as described in the first embodiment.
- the evaluation area is set indoors as compared to the first embodiment.
- the map DB 30 is replaced with the layout DB 31 as described above, and the same processing can be performed by replacing the building with the object, the city block with the room, and the road with the corridor / stairs. Become.
- the second embodiment it is possible to extend indoors by performing the same replacement. Furthermore, since indoors have characteristics such as the distribution of base stations and antennas in the height direction, for example, the degree of radio wave interference between the floors of a building is measured only on one floor and corrected by comparison with estimated values. A mode is also conceivable in which a value is calculated and this correction value is applied to a floor where no actual measurement is performed.
- FIG. 18 is a block diagram showing an outline of the present invention.
- the radio wave environment data correction system of the present invention uses radio wave environment data, which is information indicating radio wave environment characteristics in an area around a base station (evaluation area) of a wireless communication system, and measured data at limited measurement points in the evaluation area.
- a radio wave environment data correction system for correction comprising a correction value determination means 1.
- the correction value determining means 1 (for example, the correction value calculating means 50) is a sub-area that is an area obtained by dividing the evaluation area based on an area use classification that is a predetermined classification according to the layout of an object or space in the evaluation area. Is determined based on the actual measurement data at the measurement points belonging to the sub-area.
- the example of the correction value determination unit 1 is also shown as the radio wave environment correction unit 60 that determines that the radio wave environment data held in the second embodiment is used.
- FIG. 19 is a block diagram showing another configuration example of the radio wave environment data correction system of the present invention.
- the correction value determination unit 1 includes a correction value calculation unit 11, and further includes a sub-area division unit 2 and a radio wave environment correction unit 3. May be.
- the sub-area dividing means 2 (for example, the sub-area dividing means 40) divides the evaluation area into sub-areas based on the area use division.
- the correction value calculation means 11 calculates the correction value in the sub area using the measured data in which the measurement point is inside the sub area.
- the radio wave environment correction unit 3 (for example, the radio wave environment correction unit 60) corrects the radio wave environment data inside the sub-area using the calculated correction value.
- the radio wave environment data correction system of the present invention may further include a correction value holding means 4.
- the correction value holding means 4 (for example, the correction value DB 90) holds the correction value obtained by the present invention.
- the radio wave environment correction unit 3 uses the base station parameter when the correction value held in the correction value holding unit 4 is obtained as the base station parameter of the radio wave environment data to be corrected. If the difference is the same or within a predetermined range, the radio wave environment data may be corrected using the stored correction value.
- an area use classification when the evaluation area is outdoors, an area use classification may be used in which roads whose angle change is equal to or less than a predetermined value are the same subarea. Further, when the evaluation area is indoor, an area use division having the same room or the same floor as the same subarea may be used.
- an area obtained by dividing the subarea divided based on the area use division according to the direction to the base station or the distance from the base station may be used as a subarea as a correction target unit.
- an area obtained by dividing the subarea divided based on the area use division according to the distribution of the actual measurement data may be used as a subarea as a correction target unit.
- the radio wave environment data may be estimated data calculated by radio wave propagation simulation. Further, the radio wave propagation simulation may use a ray tracing method.
- radio wave environment data correction system of the present invention radio wave environment data correction using actual measurement data at measurement points in the area surrounding the base station of the wireless communication system can be performed at limited measurement points. It becomes possible to carry out more accurately. In particular, it is possible to correct radio wave environment data for realizing a significant improvement in estimation accuracy even in urban areas and indoors. Note that such features in the radio wave environment data system of the present invention can also be realized as a radio wave environment data correction method or radio wave environment data correction program.
- sub-area dividing unit, the correction value calculating unit, and the radio wave environment correcting unit described in the above embodiment may be realized as the same unit or may be realized as separate units.
- various databases shown in the above embodiment may be realized as the same unit or may be realized as separate units.
- the radio wave environment data correction system is an area obtained by dividing the base station peripheral area based on an area use category that is a predetermined category according to an object or space layout in the base station peripheral area of the wireless communication system.
- a correction value determination unit that determines a correction value for correcting radio wave environment data, which is information indicating radio wave environment characteristics in the area around the base station, based on actual measurement data at measurement points belonging to the sub area for a certain sub area. (For example, realized by the correction value determination unit 1 and the correction value calculation unit 50).
- the correction value determination unit includes a correction value calculation unit that calculates a correction value in the sub-area using actual measurement data having a measurement point inside the sub-area, and further includes radio wave environment data.
- the system includes a sub-area dividing unit that divides the base station peripheral area into sub-areas based on the area use classification, and a radio wave that corrects radio environment data inside the sub-area using the correction value calculated by the correction value calculating unit.
- An environment correction unit may be provided.
- the radio wave environment data correction system includes a correction value holding unit that holds a correction value.
- the radio wave environment correction unit holds a parameter of a base station of radio wave environment data to be corrected in the correction value holding unit.
- the radio wave environment data is corrected using the stored correction value. Also good.
- the radio wave environment data correction system is configured to use an area usage classification in which roads whose angle change is not more than a predetermined value are the same subarea when the area around the base station is outdoors. It may be.
- the radio wave environment data correction system may be configured to use area use divisions in which the same room or the same floor is the same subarea.
- the subarea divided based on the area use classification is further divided into subareas as correction target units, which are divided according to the direction to the base station or the distance from the base station. It may be configured to be used as
- the radio wave environment data correction system is configured to use, as a sub-area as a correction target unit, a region obtained by further dividing a sub-area divided based on the area use classification according to the distribution of measured data. May be.
- the radio wave environment data may be estimated data calculated by a radio wave propagation simulation.
- the radio wave propagation simulation may use a ray tracing method.
- the radio wave environment data correction system is an area obtained by dividing the base station peripheral area based on an area use section that is a predetermined section according to an object or space layout in the base station peripheral area of the wireless communication system.
- Correction value determination means for determining a correction value for correcting radio wave environment data, which is information indicating radio wave environment characteristics in the area around the base station, based on actual measurement data at measurement points belonging to the sub area for a certain sub area (For example, it may be realized by the correction value determining means 1 or the correction value calculating means 50).
- the present invention is applicable to uses such as service area design in mobile communications.
- the present invention can be applied to a purpose of accurately and efficiently grasping a service area when a base station to be designed is installed at a predetermined position and with predetermined parameters.
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Abstract
Description
次に、発明を実施するための最良の形態について図面を参照して詳細に説明する。図1は、本発明の第1の実施形態の電波環境データ補正システムの構成例を示すブロック図である。本実施形態の電波環境データ補正システムは、推定データベース10と、基地局データベース15と、実測データベース20と、地図データベース30と、サブエリア分割手段40と、補正値算出手段50と、電波環境補正手段60と、制御部70と、メモリ80とを備えている。
・S1:S2:S3=S1’:S2’:S3’
・S1’+S2’+S3’=S’
次に、本発明の第2の実施形態について説明する。図14は、第2の実施形態の電波環境データ補正システムの構成例を示すブロック図である。本実施形態の電波環境データ補正システムは、図1に示す第1の実施の形態で示した各要素に加えて、補正値データベース90を含んで構成される。
次に、本発明の第3の実施形態について説明する。図16は、第3の実施形態の電波環境データ補正システムの構成例を示すブロック図である。本実施形態の電波環境データ補正システムは、図1に示す第1の実施形態で示した各要素に対して、地図DB30がレイアウトデータベース31に置き換えられている。上記第1の実施の形態は、評価エリアとして屋外を対象としたものであったが、本実施の形態は、屋内を対象としたものである。
11 補正値算出手段
2 サブエリア分割手段
3 電波環境補正手段
4 補正値保持手段
10 推定データベース
20 実測データベース
30 地図データベース
40 サブエリア分割手段
50 補正値算出手段
60 電波環境補正手段
70 制御部
80 メモリ
Claims (25)
- 無線通信システムの基地局周辺エリア内における物体または空間のレイアウトに応じて予め定められる区分であるエリア利用区分に基づいて前記基地局周辺エリアを分割した領域であるサブエリアについて、当該サブエリアに属する測定点における実測データを元に、前記基地局周辺エリアにおける電波環境特性を示す情報である電波環境データを補正するための補正値を決定する補正値決定手段を備えた
ことを特徴とする電波環境データ補正システム。 - 前記補正値決定手段は、測定点がサブエリア内部にある実測データを用いて当該サブエリアにおける補正値を算出する補正値算出手段を含み、
前記基地局周辺エリアを前記エリア利用区分に基づいてサブエリアに分割するサブエリア分割手段と、
前記補正値算出手段が算出した補正値を用いてサブエリア内部の電波環境データを補正する電波環境補正手段とを備えた
請求項1に記載の電波環境データ補正システム。 - 補正値を保持する補正値保持手段を備え、
電波環境補正手段は、補正対象とする電波環境データの基地局のパラメータが、前記補正値保持手段に保持されている補正値を求めた際の基地局のパラメータと同一または所定の範囲内の差異である場合には、前記保持されている補正値を用いて電波環境データを補正する
請求項2に記載の電波環境データ補正システム。 - 前記基地局周辺エリアが屋外の場合には、自身の角度変化が所定の値以下となる道路を同一のサブエリアとするエリア利用区分を用いる
請求項1から請求項3のいずれか1項に記載の電波環境データ補正システム。 - 前記基地局周辺エリアが屋内の場合には、同一の室内または同一のフロアを同一のサブエリアとするエリア利用区分を用いる
請求項1から請求項3のいずれか1項に記載の電波環境データ補正システム。 - エリア利用区分に基づいて分割されたサブエリアを、さらに基地局に対する方位あるいは前記基地局からの距離に応じて分割した領域を、補正対象単位としてのサブエリアとして用いる
請求項1から請求項5のいずれか1項に記載の電波環境データ補正システム。 - エリア利用区分に基づいて分割されたサブエリアを、さらに実測データの分布に応じて分割した領域を、補正対象単位としてのサブエリアとして用いる
請求項1から請求項6のいずれか1項に記載の電波環境データ補正システム。 - 前記電波環境データは、電波伝搬シミュレーションによって算出された推定データである
請求項1から請求項7のいずれか1項に記載の電波環境データ補正システム。 - 前記電波伝搬シミュレーションは、レイトレーシング法を用いている
請求項8に記載の電波環境データ補正システム。 - 無線通信システムの基地局周辺エリア内における物体または空間のレイアウトに応じて予め定められる区分であるエリア利用区分に基づいて前記基地局周辺エリアを分割した領域であるサブエリアについて、当該サブエリアに属する測定点における実測データを元に、前記基地局周辺エリアにおける電波環境特性を示す情報である電波環境データを補正するための補正値を決定する
ことを特徴とする電波環境データ補正方法。 - 前記基地局周辺エリアを前記エリア利用区分に基づいてサブエリアに分割し、
測定点がサブエリア内部にある実測データを用いて当該サブエリアにおける補正値を算出し、
算出した補正値を用いてサブエリア内部の電波環境データを補正する
請求項10に記載の電波環境データ補正方法。 - 補正値を記憶装置に保持させ、
補正対象とする電波環境データの基地局のパラメータが、前記保持されている補正値を求めた際の基地局のパラメータと同一または所定の範囲内の差異である場合には、前記保持されている補正値を用いて電波環境データを補正する
請求項11に記載の電波環境データ補正方法。 - 前記基地局周辺エリアが屋外の場合には、自身の角度変化が所定の値以下となる道路を同一のサブエリアとするエリア利用区分を用いる
請求項10から請求項12のいずれか1項に記載の電波環境データ補正方法。 - 前記エリアが屋内の場合には、同一の室内または同一のフロアを同一のサブエリアとするエリア利用区分を用いる
請求項10から請求項12のいずれか1項に記載の電波環境データ補正方法。 - エリア利用区分に基づいて分割されたサブエリアを、さらに基地局に対する方位あるいは前記基地局からの距離に応じて分割した領域を、補正対象単位としてのサブエリアとして用いる
請求項10から請求項14のいずれか1項に記載の電波環境データ補正方法。 - エリア利用区分に基づいて分割されたサブエリアを、さらに実測データの分布に応じて分割した領域を、補正対象単位としてのサブエリアとして用いる
請求項10から請求項15のいずれか1項に記載の電波環境データ補正方法。 - 前記電波環境データは、電波伝搬シミュレーションによって算出された推定データである
請求項10から請求項16のいずれか1項に記載の電波環境データ補正方法。 - 前記電波伝搬シミュレーションは、レイトレーシング法を用いている
請求項17に記載の電波環境データ補正方法。 - コンピュータに、
無線通信システムの基地局周辺エリア内における物体または空間のレイアウトに応じて予め定められる区分であるエリア利用区分に基づいて前記基地局周辺エリアを分割した領域であるサブエリアについて、当該サブエリアに属する測定点における実測データを元に、前記基地局周辺エリアにおける電波環境特性を示す情報である電波環境データを補正するための補正値を決定する処理を
実行させるための電波環境データ補正プログラム。 - コンピュータに、
前記基地局周辺エリアを前記エリア利用区分に基づいてサブエリアに分割する処理と、
測定点がサブエリア内部にある実測データを用いて当該サブエリアにおける補正値を算出する処理と、
算出した補正値を用いてサブエリア内部の電波環境データを補正する処理とを実行させる
請求項19に記載の電波環境データ補正プログラム。 - 補正値を保持する補正値保持手段を備えたコンピュータに、
補正対象とする電波環境データの基地局のパラメータが、前記保持されている補正値を求めた際の基地局のパラメータと同一または所定の範囲内の差異である場合には、前記保持されている補正値を用いて電波環境データを補正する処理を実行させる
請求項20に記載の電波環境データ補正プログラム。 - 前記基地局周辺エリアが屋外の場合には、自身の角度変化が所定の値以下となる道路を同一のサブエリアとするエリア利用区分を用いる
請求項19から請求項21のいずれか1項に記載の電波環境データ補正プログラム。 - 前記基地局周辺エリアが屋内の場合には、同一の室内または同一のフロアを同一のサブエリアとするエリア利用区分を用いる
請求項19から請求項21のいずれか1項に記載の電波環境データ補正プログラム。 - エリア利用区分に基づいて分割されたサブエリアを、さらに基地局に対する方位あるいは前記基地局からの距離に応じて分割した領域を、補正対象単位としてのサブエリアとして用いる
請求項19から請求項23のいずれか1項に記載の電波環境データ補正プログラム。 - エリア利用区分に基づいて分割されたサブエリアを、さらに実測データの分布に応じて分割した領域を、補正対象単位としてのサブエリアとして用いる
請求項19から請求項24のいずれか1項に記載の電波環境データ補正プログラム。
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