Radio network modification support system and radio network modification support method

Wireless network change support system and method for supporting wireless network change

Technical field

The present invention relates to a wireless network change support system and a method for supporting wireless network change. More specifically, the present invention relates to a wireless network change support system that proposes a more appropriate wireless network and a method for supporting wireless network change.

Background technique

Even after starting the operation of the wireless network (including multiple wireless base stations to perform wireless communication between users), through the "wireless base station extension" or "wireless parameter change" in the wireless base station, you can occasionally obtain the coverage area of the wireless network. Expansion or increase in wireless network bandwidth.

Fig. 1 is a block diagram showing the configuration of a conventional wireless network. The wireless network shown in FIG. 1 includes a wireless base station 101, a wireless base station 102, a network 103, and a wireless network management part 104. The wireless network management part 104 is managed by a wireless network service provider. The wireless base station 101 and the wireless base station 102 are managed by the wireless network management section 104 through the network 103. The coverage area and bandwidth are set as wireless parameters in each of the wireless base station 101 and the wireless base station 102. The coverage area of the wireless network is the area to be covered by each wireless base station included in the wireless network. Here, the wireless base station 101 has a coverage area 101a whose bandwidth can accommodate three user terminals. In addition, the wireless base station 102 has a coverage area 102a whose bandwidth can accommodate three user terminals.

In FIG. 1, user terminals 201, 202, and 203 in the wireless network are in the coverage area 101a. The wireless base station 101 accommodates user terminals 201, 202, and 203. The user terminals 206, 207, and 208 are in the coverage area 102a. The wireless base station 102 accommodates user terminals 206, 207, and 208. Examples of each user terminal are mobile terminals such as cellular phones and PDAs (Personal Digital Assistants), and notebook-type personal computers. The user terminals 204 and 205 are in the coverage area 101a covered by the wireless base station 101, however, they are not accommodated by the wireless base station 101 because the bandwidth of the wireless base station 101 has no capacity. The user terminals 209, 210, and 211 are not accommodated in the wireless network at all, because they are neither included in the coverage area 101a of the wireless base station 101 nor in the coverage area 102a of the wireless base station 102.

Fig. 2 is a block diagram showing another configuration of a conventional wireless network. Fig. 2 shows an example in which a wireless base station 105 is added to the configuration shown in Fig. 1 in order to expand the coverage area in the wireless network. In FIG. 2, the same reference numerals denote the same items as in the configuration of FIG. 1. In FIG. 2, the joining wireless base station 105 has a coverage area 105a and has a bandwidth sufficient to accommodate three user terminals. Since the coverage area is expanded by joining the wireless base station 105, the user terminals 209, 210, and 211 will be accommodated in the wireless network.

Fig. 3 is a block diagram showing another configuration of a conventional wireless network. FIG. 3 shows an example of increasing the bandwidth of the wireless base station 101 by changing the wireless parameters of the wireless base station 101 in FIG. 1. In FIG. 3, the same reference numerals denote the same items as in the configuration described in FIG. 1. In FIG. 3, by changing the wireless parameters, the wireless base station 101 has a bandwidth sufficient to accommodate five user terminals. As a result, the user terminals 204 and 205 that are not accommodated by the wireless base station 101 in the configuration shown in FIG. 1 are accommodated by the wireless base station 101.

Fig. 4 is a block diagram showing another configuration of a conventional wireless network. FIG. 4 shows an example of changing the wireless parameters of the wireless base station 101 shown in FIG. 1 to expand the coverage area 101a of the wireless base station 101 and increase the bandwidth of the wireless base station 101. In FIG. 4, the same reference numerals indicate the same items as in the configuration shown in FIG. 1. In FIG. 4, by changing the wireless parameters, the coverage area 101a of the wireless base station 101 is expanded, and the wireless base station 101 has a bandwidth sufficient to accommodate seven user terminals. As a result, the user terminals 204, 205, 209, and 210 can be further accommodated.

In the conventional technology, when the "extension of the wireless base station" is performed as shown in Figures 2, 3, and 4 or the wireless parameters of the wireless base station are changed, a simulator is used to calculate the expansion of the wireless network coverage area or the bandwidth of the wireless network Based on the calculation results, a plan regarding the "extension of the wireless base station or the change of the wireless parameters of the wireless base station is made. Then, these solutions are provided to wireless network service providers.

Coincidentally, the wireless network service provider collects usage fees based on the flow of users accommodated in the wireless network to obtain revenue. On the other hand, the operating cost of a wireless network is an expense. The difference between revenue and expenditure is the profit of the wireless network service provider.

In combination with the above description, Japanese Patent Application Early Publications JP H08-317458A and JP2001-285923A disclose such a technology, through this technology, wireless network service providers consider their own profits to determine the deployment mode of wireless base stations.

Japanese Patent Application Early Publication JP H08-317458A discloses a method for determining the deployment mode of PHS base stations. In this method of deciding the deployment mode of PHS base stations, first, prepare a plurality of different PHS base station deployment modes for a predetermined service planning area. Next, a simulation of the electric field intensity distribution is performed for each arrangement pattern. Then, based on the simulation results, the ratio between the size of the call-possible area and the size of the service planning area is calculated as the quality evaluation value in each layout mode. Thereafter, the cost evaluation value is calculated in each layout pattern. Then, based on the quality evaluation value and cost evaluation value of each layout pattern, the layout pattern for the service planning area is decided from all the layout patterns.

Japanese Patent Application Early Publication JP 2001-285923A discloses a method for deciding the deployment mode of base stations. In this method for deciding the layout mode of base stations, first, a map of the target area is prepared for the layout of the base stations, the map including data on the shape of the building that affects the transmission of electric waves. Next, detect the location where the base station can be placed from the prepared map. Then, each such location is designated as a base station candidate point where the base station is to be arranged. In addition, area evaluation points are designated, and these points are given discretely as evaluation positions of receiving capability, so as to specify the communication possible area in the target area for the layout of the base station. Thereafter, for each base station candidate point, in a case where the base station is arranged in one of the base station candidate points, the electric power received at each area evaluation point is calculated. Based on this result, the communication possible area when the base station is arranged at one of the base station candidate points is specified. However, the given communication possible area is a set of area evaluation points determined as communication possible positions, where the communication possible position is a position in which the received electric power is greater than a predetermined threshold. Thereafter, the genetic information expression form corresponding to the combination of base station candidate points is selected to arrange the base station. The genetic information expression form is used to set the evaluation function corresponding to the base station deployment purpose. The genetic algorithm is used to search for genetic information that maximizes the adaptability given by the evaluation function, and then the optimal base station layout mode is determined.

These technologies provide the deployment mode and deployment cost of wireless base stations as data for determining the deployment mode of wireless base stations. The layout mode is determined based on simulation. The arrangement cost is the cost required to obtain this arrangement pattern. However, only the information on the expenditure of the wireless network service provider is provided as the information on the profit of the wireless network service provider.

The profits of wireless network service providers are obtained by subtracting expenses from revenue. Therefore, if there is no news about revenue when the wireless network is changed, it is difficult for the wireless network service provider to decide the change of the wireless network in consideration of its own profit. In other words, it is difficult for these technologies to provide changes to the wireless network to increase the profit margin of the wireless network, which is the ultimate goal of the wireless network service provider.

In conjunction with the above description, Japanese Patent Application Early Publication JP H08-322079A discloses a method for deciding the placement position of an extended base station in PHS. The method for deciding the arrangement position of the extended base station in PHS decides the arrangement position of the extended base station to expand the PHS base station in the service area in which one or more PHS base stations are arranged. First, the electric field strength is measured at a plurality of points in the above-mentioned service area. Next, the parameters of the arithmetic model are adjusted so that the electric field intensity distribution in the service area calculated by the simulation using the arithmetic model matches the electric field intensity distribution of the electric field intensity measurement result as much as possible. Then, after adjusting the parameters, the arithmetic model is given parameters about the extended base station, which include parameters about the deployment position of the extended base station, so as to simulate the electric field intensity distribution in the above-mentioned service area when the extended base station is assumed to be deployed. After that, the simulation results were evaluated. After repeating each process described above, the parameters about the extended base station are changed, and based on the evaluation result of each parameter about the extended base station, the parameters about the appropriate extended base station are decided.

Japanese Patent Application Early Publication JP H06-188817A discloses a method for arranging wireless base stations. In the method for arranging base stations, each wireless base station is arranged in such a way that the interval between the micro cell base stations is inversely proportional to the deviation of the traffic load, so that the traffic load covered by each cell becomes substantially equal. This method attempts to make the communication quality of the reverse link in the code division multiple access mobile communication system constant.

Japanese Patent Application Early Publication JP 2003-8498A discloses a service area inspection system. The service area inspection system performs service area measurement, optimization, and management of newly expanded base stations. The service area inspection system includes an area measurement device, a mobile communication system, a network and a server. The area measurement device calculates the service area based on the simulation result, and moves to the service area to perform various measurements and optimization of the base station. The data processing base station communicates with the area measurement device for data processing. The mobile communication system includes a new bracket base station and multiple control stations to control the new extended base station. The network is connected with the mobile communication system. The server is connected with the network to analyze the measurement data sent from the area measurement device, and then provides the processing result to the area measurement device. The area measurement device adjusts the parameters and antenna tilt of the new extended base station through remote control based on the processing result from the server.

Recently, charges for wireless network use have been decreasing in recent years. Therefore, it is very important for wireless network service providers to compress the investment and operating costs of wireless networks and increase profit margins on the premise of meeting the needs of wireless network users and communication quality. They hope to propose "extension of wireless base stations" and changes in wireless parameters of wireless base stations, through which they can maximize the profitability of wireless networks.

Patent Application Document 1: JP H08-317458A Patent Application Document 2: JP 2001-285923A Patent Application Document 3: JP H08-322079A Patent Application Document 4: JP H06-188817A Patent Application Document 5: JP 2003-8498A The purpose of the invention is to provide a wireless network change support system and a method for supporting wireless network changes, which can propose a more appropriate wireless network than before.

Another object of the present invention is to provide a wireless network change support system and a method for spending wireless network changes, which can propose changes to the wireless network to increase the profit margin of the wireless network.

These and other objects, features and advantages of the present invention can be easily understood by referring to the following description and drawings.

In order to realize one aspect of the present invention, the present invention provides a wireless network change support system, which includes a change setting part, an income forecast part, and an expense calculation part. The changing setting part sets change data for changing the setting data based on the state data indicating the state of the wireless network having the wireless base station and the setting data indicating the setting of the wireless network. The revenue forecast part is based on the status data, setting data, and change data, and calculates the predicted income in the wireless network when the setting data is changed. The expense calculation part is based on the change data, and calculates the predicted expense necessary to execute the change of the wireless network indicated in the change data.

The wireless network change support system also includes an income and expenditure calculation part, which calculates the profit of the wireless network when the setting data is changed on the basis of the changed data based on the forecasted income and the forecasted expenditure.

In the wireless network change support system, the revenue forecasting part includes a traffic forecasting part and an income calculating part. The traffic prediction part calculates the predicted traffic data based on the status data, the setting data, and the change data, wherein the predicted traffic data indicates the predicted traffic load in the wireless network when the setting data is changed on the basis of the change data. The revenue calculation part is based on the forecasted traffic data to calculate the forecasted income.

In the wireless network change support system, the change setting part includes a base station extension part, which sets extended location data based on status data and setting data, wherein the extended location data indicates the extended location of the extended wireless base station in the wireless network. The change data includes extended position data.

The wireless network change support system further includes a first storage part storing setting data and a second storage part storing status data. The setting data includes coverage area data indicating a coverage area of a sector of each wireless base station included in the wireless network before the wireless base station is expanded. The status data includes flow data indicating the status of the flow of the sector of each wireless base station included in the wireless network before the wireless base station is expanded. The extension part of the base station includes: an extension point search part, which searches for an extension location based on the coverage area data stored in the first storage part and the traffic data stored in the second storage part. The extension part of the base station sets the extension location data based on the search result of the extension point search part.

In this wireless network change support system, the extension point search section searches for at least one of the following as an extension location: an area other than the coverage area that occupies a large area and is surrounded by sectors with a large traffic load, and each Among the sectors of the wireless base station, there are a large number of sectors with a traffic load that cannot be accommodated.

In the wireless network change support system, the setting data includes wireless parameters indicating communication characteristics of the wireless network. The change setting part includes a wireless parameter change part that sets wireless parameter change data indicating the change of the wireless parameter based on the status data and the setting data. The change data includes wireless parameter change data.

In the wireless network change support system, the setting data includes wireless parameters indicating communication characteristics of the wireless network. The change setting part includes a wireless parameter change part that sets wireless parameter change data indicating the change of the wireless parameter based on the status data and the setting data.

The wireless network change support system further includes a third storage part that stores setting data and a fourth storage part that stores status data. The setting data includes coverage area data indicating the coverage area of the sector of each wireless base station included in the wireless network before the wireless parameter is changed. The status data includes flow data indicating the status of the flow of the sector of each wireless base station included in the wireless network before the wireless parameters are changed. The wireless parameter change part includes a change target search part, which searches for a wireless base station whose wireless parameters are to be changed based on the coverage area data stored in the third storage part and the flow data stored in the fourth storage part. The wireless parameter changing part sets the wireless base station whose wireless parameter is to be changed based on the search result of the changing target search part.

The wireless network change support system further includes a third storage part that stores setting data and a fourth storage part that stores status data. The setting data includes coverage area data indicating the coverage area of the sector of each wireless base station included in the wireless network before the wireless parameter is changed. The status data includes flow data indicating the status of the flow of the sector of each wireless base station included in the wireless network before the wireless parameters are changed. The wireless parameter change part includes a change target search part, which searches for a wireless base station whose wireless parameters are to be changed based on the coverage area data stored in the third storage part and the flow data stored in the fourth storage part. The wireless parameter changing part sets the wireless base station whose wireless parameter is to be changed based on the search result of the changing target search part. Change the target search part to search for wireless base stations in the following areas outside the coverage area that occupy a large area and are surrounded by sectors with a large traffic load. There are a large number of sectors with each wireless base station that cannot be used. The radio base station of the sector that accommodates the traffic load, and the radio base station placed at the extended location indicated in the extended location data.

In order to realize another aspect of the present invention, the present invention provides a method for supporting a wireless network change, which performs a change of a wireless network with a wireless base station by using a wireless network change support system. The method includes: (a) based on state data indicating the state of the wireless network and setting data indicating the setting of the wireless network, setting change data for changing the setting data by the change setting part of the network change support system; (b) based on the state Data, setting data, and change data are calculated by the income forecasting part of the network change support system to calculate the forecasted income in the wireless network when the setting data is changed; and (c) based on the change data, calculated and executed by the expense calculation part of the network change support system The predicted expenditure necessary to change the wireless network indicated in the change data.

The method for supporting the wireless network change further includes: (d) Based on the predicted revenue and predicted expenditure, the revenue and expenditure calculation part of the network change support system calculates the profit of the wireless network when the setting data is changed on the basis of the changed data.

In the method for supporting wireless network changes, step (b) includes: (b1) based on the status data, setting data, and change data, the revenue forecasting part calculates the predicted flow data, wherein the predicted flow data indicates that the data is changing The forecasted traffic load in the wireless network when the setting data is changed on the basis of; and (b2) the forecasted income is calculated by the income forecasting part based on the forecasted traffic data.

In the method for supporting the wireless network change, step (a) includes: (a1) based on the status data and the setting data, the extended location data is set by the change setting part, the extended location data indicates an extended wireless base station in the wireless network Extension location. The change data includes extended position data.

In the method for supporting the wireless network change, step (a1) includes: (a11) searching for the extension location by the changing setting part based on the setting data and status data; and (a12) setting the extension by the changing setting part based on the search result Location data. The setting data includes coverage area data indicating a coverage area of a sector of each wireless base station included in the wireless network before the wireless base station is expanded. The status data includes flow data indicating the status of the flow of the sector of each wireless base station included in the wireless network before the wireless base station is expanded.

In the method for supporting the wireless network change, step (a11) includes: (a111) searching for at least one of the following as an extended location by the change setting part: the area other than the coverage area occupies a large area and is equipped with a large number of The area surrounded by sectors of traffic, and the sectors of each wireless base station that have a large amount of traffic that cannot be accommodated.

In this method for supporting wireless network changes, the setting data includes wireless parameters indicating communication characteristics of the wireless network. Step (a) also includes: (a2) based on the status data and the setting data, setting the wireless parameter change data indicating the change of the wireless parameter by the change setting part. The change data includes wireless parameter change data.

In this method for supporting wireless network changes, the setting data includes wireless parameters indicating communication characteristics of the wireless network. Step (a) also includes: (a2) based on the status data and the setting data, setting the wireless parameter change data indicating the change of the wireless parameter by the change setting part. The change data includes wireless parameter change data.

In the method for supporting the wireless network change, step (a2) includes: (a21) based on the setting data and status data, searching for a wireless base station whose wireless parameters are to be changed by the setting change section; and (a22) based on the change target In the search result of the search part (11b1), the wireless base station whose wireless parameters are to be changed is set by the change setting part. The setting data includes coverage area data indicating the coverage area of the sector of each wireless base station included in the wireless network before the wireless parameter is changed. The status data includes flow data indicating the status of the flow of the sector of each wireless base station included in the wireless network before the wireless parameters are changed.

In the method for supporting the wireless network change, step (a2) includes: (a21) based on the setting data and status data, searching for the wireless base station whose wireless parameters are to be changed by the changing setting part; and (a22) based on the change target In the search result of the search part (11b1), the wireless base station whose wireless parameters are to be changed is set by the change setting part. The setting data includes coverage area data indicating the coverage area of the sector of each wireless base station included in the wireless network before the wireless parameter is changed. The status data includes flow data indicating the status of the flow of the sector of each wireless base station included in the wireless network before the wireless parameters are changed. Step (a21) includes: (a211) Searching for at least one of the following wireless base stations whose wireless parameters are to be changed by the changing setting part: being placed in an area other than the coverage area, occupying a large area and having a large traffic load The wireless base stations around the area surrounded by the sectors of each wireless base station, the wireless base stations that have a large amount of traffic load that cannot be accommodated in the sectors of each wireless base station, and the wireless base stations placed at the extended position indicated in the extended position data Wireless base station.

In order to realize another aspect of the present invention, the present invention provides a computer program product with program code means for executing the method for supporting wireless network changes according to any one of the above items when the program is running on a computer All the steps.

In order to realize another aspect of the present invention, the present invention provides a computer program product with a program code device according to the above-mentioned computer program product, which is stored in a storage device that can be read by a computer.

detailed description

Hereinafter, embodiments of the wireless network change support system and the method for supporting wireless network change according to the present invention will be described with reference to the accompanying drawings.

First, as the wireless network change support system in the embodiment of the present invention, the configuration of the wireless network optimization support system is explained. FIG. 5 is a block diagram showing the configuration of a wireless network optimization support system as a wireless network change support system in an embodiment of the present invention. The wireless network optimization support system in the embodiment of the present invention can provide a change plan to increase the profit of the existing wireless network and obtain the efficiency of the wireless network.

In FIG. 5, the wireless network optimization support system 1 includes a change setting section 11, an income prediction section 12, an expense calculation section 13, an income and expense calculation section 14, and wireless parameter storage as a first storage section and a third storage section. Part 15.

The wireless network optimization support system 1 is a data processor using a workstation as an example. In this case, the change setting section 11, the income prediction section 12, the expense calculation section 13, and the income and expense calculation section 14 are programs, and the wireless parameter storage section 15 is a program and data.

Each of the change setting section 11, the income prediction section 12, the expense calculation section 13, and the income and expense calculation section 14 may be a data processor exemplified by a workstation and a personal computer, and the wireless parameter storage section 15 may be a database. In this case, the wireless network optimization support system 1 is a combined system of multiple data processors and databases.

The wireless network optimization support system 1 is connected with the wireless network management part 4 in the wireless network. The wireless network includes wireless base stations 20-1 to 20-n (n is a natural number), a network 3, and a wireless network management section 4. The wireless network management section 4 is managed by a wireless network manager. The wireless base stations 20-1 to 20-n are managed by the wireless network management section 4 through the network. The wireless base stations 20-1 to 20-n perform communication with user terminals. The bandwidth and coverage area as wireless parameters are set in each of the wireless base stations 20-1 to 20-n. The coverage area is an area to be covered by each wireless base station 20 included in the wireless network. The wireless network management part 4, the network 3, and the wireless base stations 20-1 to 20-n are similar to the wireless network management part 104, the network 103, and the wireless base stations 101, 102 in the conventional technology, and the explanation is omitted here.

The change setting section 11 sets change data, which shows changes in the wireless network. The change setting section 11 includes a base station extension section 11a and a wireless parameter change section 11b. The base station extension section 11a has an extension point search section 11a1. The wireless parameter change section 11b has a change target search section 11b1.

The income prediction section 12 calculates the predicted income in the wireless network in which the transformation shown in the change data set by the change device section 11 is reflected. The income prediction section 12 includes a simulator 12a as a flow prediction section, an income calculation section 12b, and a flow data storage section 12c as a second storage section and a fourth storage point. The income calculation section 12b has a current flow income calculation section 12b1 and a forecast flow income calculation section 12b2.

The expense calculation section 13 calculates the expense required to reflect the change shown by the change data set by the change setting section 11 to the wireless network. The expense calculation section 13 has a wireless parameter change cost calculation section 13a and a wireless base station expansion cost calculation section 13b.

The income and expense calculation section 14 calculates the profit after the wireless network change based on the predicted income calculated by the income prediction section 12 and the expense calculated by the expense calculation section 13.

The wireless parameter storage section 15 stores the input wireless parameters 31 in the wireless network. The wireless parameter storage section 15 provides the stored wireless parameters in the wireless network to the base station extension section 11a, the wireless parameter change section 11b, and the simulator 12a. The wireless parameter is the data through which the performance of the wireless network can be determined.

For example, the wireless parameters (setting data) include data showing the installation point of the wireless base station and data of various parameters. The data showing the installation point of the wireless base station, for example, indicates altitude, latitude, and longitude.

The various parameters are, for example, a parameter showing the tilt angle of the antenna of each radio base station, a parameter showing the transmission electric power of each radio base station, a parameter showing the switching threshold value of each radio base station, and a parameter showing each radio parameter determined by the radio parameter. The coverage area data of the coverage area of each sector of each base station and so on.

The flow data storage section 12c stores flow data 32 (status data) showing the flow status of the wireless network. The flow data indicates the usage status of the users accommodated in the wireless network. The traffic data includes the traffic load, channel utilization, and call obstruction rate of each radio base station sector in the wireless network.

Specifically, the flow data storage section 12c stores flow data representing the state of the currently accommodated flow, which can be obtained after the wireless network enters the service. In addition, the flow data storage section 12c stores predicted flow data supplied from the simulator 12a.

The flow data storage section 12c provides the current flow data to the base station extension section 11a, the wireless parameter changing section 11b, the simulator 12a, and the current flow revenue calculation section 12b1. In addition, the flow data storage section 12c supplies the predicted flow data provided from the simulator 12a to the predicted flow income calculation section 12b2.

The base station extension part 11a sets the extension location as change data, which represents the extension location of the wireless base station in the wireless network. Specifically, the base station extension part 11a sets the extension point of the wireless base station to itself based on the input of the wireless parameters of the current wireless network stored in the wireless parameter storage part 15 and the current flow data stored in the flow data storage part 12c (base station extension Part 11a). Then, the base station extension section 11a outputs the setting data of the extension point in the wireless base station as change data.

Here, the base station extension part 11a may set the extension point based on the input of the extension point of the wireless base station determined by the person based on the wireless parameters of the current wireless network and the current flow data. The base station extension section 11a may also set the extension point searched by the extension point search section 11a1 as change data.

The base station extension section 11a supplies the data of the extension point of the wireless base station to the wireless parameter changing section 11b, the simulator 12a, the wireless base station extension cost calculation section 13b, and the income and expenditure calculation section 14.

The extension point search part 11a1 searches for the extension point of the wireless base station based on the wireless parameters of the current wireless network stored in the wireless parameter storage part 15 and the current flow data stored in the flow data storage part 12c. A method for searching for extension points will be explained later. The extension point search section 11a1 allocates points included in a predetermined area in the search area as extension points of the wireless base station.

The point in the predetermined area can be determined based on the judgment of a person or the base station extension portion 11a. When a person selects a point included in a predetermined area, the extended point search section 11a1 may, for example, instruct the display panel 16 to display the search area so that the person can select a point included in the predetermined area from the display. The points included in the decided predetermined area are set in the base station extension section 11a.

The wireless parameter changing section 11b changes the wireless base station's data based on the input of the current wireless parameters stored in the wireless parameter storage section 15, the current flow data stored in the flow data storage section 12c, and the data of the wireless base station extension point output from the base station extension section 11. The wireless parameters are changed to predetermined values. After that, the wireless parameter changing section 11b outputs the data of the changed wireless parameter as the changed data.

The aforementioned predetermined value may be determined by human judgment based on current wireless parameters, current flow data, and data of the wireless base station extension point output from the base station extension section 11a.

In addition, the above-mentioned predetermined value may be determined by the judgment of a person who takes the base station searched by the change target search section 11b1 explained below as the target of the wireless parameter change. In addition, the above-mentioned predetermined value may also be determined by the wireless parameter changing section 11b that uses the base station as a wireless parameter change target.

The wireless parameter changing section 11b provides the changed wireless parameters to the simulator 12a, the wireless parameter changing cost calculating section 13a, and the income and expenditure calculating section 14.

The change target search section 11b1 searches for a wireless base station whose wireless parameters are to be changed based on the current wireless parameters, current flow data, and data of the base station extension section 11a. The search method will be explained later. The change target search section 11b1 sets any sector of the searched wireless base station as the base station that is the target of the wireless parameter change, that is, it sets any sector as the change data.

The simulator 12a is based on the input of the wireless parameters of the wireless network stored in the wireless parameter storage section 15, the flow data stored in the flow data storage section 12c, the wireless base station extension point output from the base station extension section 11a, and the wireless parameter change section 11b. After the output changes, the wireless parameters simulate the operation of the wireless network.

The simulator 12a not only calculates the coverage area and bandwidth in the wireless network, but also calculates the predicted traffic data configured by the predicted traffic load and the predicted channel utilization rate in the changed wireless network according to the change data set by the change setting section 11 And predict the call failure rate. Then, the simulator 12a outputs the calculated predicted flow rate data to the flow rate data storage section 12c.

Here is an example in which the simulator 12a calculates the predicted traffic load. That is, when the change data indicates a change to expand the coverage area in the wireless network, in the calculation, the traffic load of the coverage area to be expanded is assumed to be that of the existing traffic load in the area surrounding the coverage area to be expanded. average. When the deployment is instructed to change to increase the bandwidth of the wireless base station, the increase in traffic load based on the increase in bandwidth is assumed to be a value that can be obtained by multiplying the increase in bandwidth by a predetermined value.

In addition, the simulator 12a outputs the wireless parameters of the wireless network used for the simulation (including the coverage area data of the wireless network determined by the wireless parameters) to the wireless parameter storage section 15.

The current flow income calculation section 12b1 calculates the income obtained from the current flow load shown in the current flow data based on the input of the current flow data from the flow data storage section 12c, and outputs the calculation result to the income and expenditure calculation section 14. For example, the current flow income calculation section 12b1 calculates the income obtained in one year.

The predicted flow calculation section 12b2 calculates the predicted income obtained from the predicted flow load indicated by the predicted flow data based on the input of predicted flow data stored in the flow data storage section 12c, and outputs the calculation result to the income and expenditure calculation section 14. For example, the predicted flow calculation section 12b2 calculates the predicted income obtained in a year.

The wireless parameter change cost calculation section 13a calculates various costs necessary for changing the wireless parameter based on the input of the data of the changed wireless parameter output from the wireless parameter change section 11b, and outputs the settlement result to the income and expenditure calculation section 14.

In the process of changing wireless parameters, for example, if the transmission power is changed, additional personnel costs may occur, or sometimes a new transmission amplifier may need to be set up according to the parameter change, which requires considerable costs. For example, the wireless parameter change cost calculation section 13a has a memory in which the cost due to the parameter change and the content of the parameter change are stored in association. The wireless parameter change cost calculation section 13a calculates various costs required to change the wireless parameter by using this memory. The wireless parameter change cost calculation section 13a calculates the annual expenditure based on these total costs and the predicted use period.

The wireless base station expansion cost calculation section 13b calculates the cost necessary to extend the wireless base station to that point based on the input of the expansion point data of the wireless base station, and outputs the calculation result to the income and expense calculation section 14.

Due to the expansion of the wireless base station, for example, the cost of the wireless base station itself, the use cost of the roof of the building used to install the wireless base station, maintenance cost, etc. should occur. For example, the wireless base station expansion cost calculation section 13b has a memory in which the expansion point of the wireless base station and the cost required to expand the wireless base station at that point are stored in correlation. The wireless base station expansion cost calculation section 13b calculates the cost required to expand the wireless base station in the wireless base station expansion point by using this memory. The wireless base station expansion cost calculation section 13b calculates the annual expenditure based on these total costs and the predicted use period.

The income and expenditure calculation section 14 subtracts the current flow income from the forecast flow income in order to obtain the increased income due to the increase in the accommodated flow. In addition, the income and expense calculation section 14 adds up the expense of the cost of expanding the wireless base station and the expense of the cost of changing the wireless parameter in order to obtain the increased expense due to the expansion of the wireless base station and the change of the wireless parameter. Next, the income and expenditure calculation section 14 adds the increased expenditure due to the expansion of the wireless base station and the change of the wireless parameter to the previously incurred expenditure to obtain the expenditure after the expansion of the wireless base station and the change of the wireless parameter. Here, the previously incurred expenditure is stored in the income and expenditure calculation section 14. In addition, the income and expense calculation section 14 subtracts the obtained expense from the aforementioned income to obtain a profit, and divides the profit by the expense to obtain a profit rate. The income and expenditure calculation part 14 then outputs the profit margin, profit, income, increased income, expenditure, increased expenditure, the expansion point of the wireless base station, and the changed wireless parameters to the external part (in this embodiment, the display panel 16).

Next, the operation of the wireless network optimization support system as an embodiment of the wireless network change support system of the present invention will be described below.

6 is a flowchart explaining the operation (a method of supporting wireless network change) of the wireless network optimization support system as an embodiment of the wireless network change support system of the present invention.

The wireless parameter storage section 15 stores the wireless parameters 31 before the wireless network change from the wireless network management section 4. The flow data storage section 12c stores the flow data 32 before the wireless network change from the wireless network management section 4 (step S01).

Next, the extension point search section 11a1 searches for the extension point of the wireless base station based on the current wireless parameters and current flow data (step S02).

Here, the details of step S02 are explained with reference to FIG. 7. FIG. 7 is a flowchart showing the details of step S02.

Based on the current wireless parameters in the wireless network stored in the wireless parameter storage part 15 and the current flow data stored in the flow data storage part 12c, the extension point search part 11a1 selects (searches) an area that is not covered by any base station (the wireless network in the wireless network). Uncovered area). Then, the extension point search section 11a1 selects (searches) an area that occupies a large area and is surrounded by each wireless base station having a large number of sector traffic loads (first search: step S21).

The extension point search section 11a1 selects (searches) a coverage area that has a large traffic load and is as large as that of each wireless base station based on the channel utilization rate and the call failure rate included in the current traffic data stored in the traffic data storage section 12c. Each of the sectors cannot be accommodated (second search: step S22).

The extension point search section 11a1 can perform any one of the above-mentioned first search and second search.

FIG. 8 is a diagram explaining the above-described first search and second search performed by the extension point search section 11a1. Specifically, this is an example of a cellular system showing flow data.

Each of the wireless base station 20a, the wireless base station 20b, and the wireless base station 20c respectively has a coverage area including three sectors, as shown in FIG. 8. Specifically, the base station 20a has a coverage area including a sector a, a sector b, and a sector c. In addition, the base station 20b has a coverage area including a sector d, a sector e, and a sector f. In addition, the base station 20c has a coverage area including a sector g, a sector h, and a sector i . The oblique areas (uncovered area A, uncovered area B, and uncovered area C) in Fig. 8 indicate areas in the wireless system where the reception levels from all sectors are equal to or less than the predetermined value in the area (uncovered area A, uncovered area B, and uncovered area C). Covered area).

Next, referring to FIG. 8, the above-described first search and second search performed by the extension point search section 11a1 are explained.

In the first search process, the extension point search section 11a1 selects the uncovered area A because this area is the widest among the uncovered areas A to C, and the sectors of all surrounding radio base stations have a large traffic load (step S21). The judgment of "the flow load is large" is performed by the judgment processing showing that the flow load is greater than a predetermined value. For example, make a judgment when the traffic load is 600 calls or more.

In the second search process, the extension point search section 11a1 selects the coverage area of the sector b because the sector b has a large traffic load to be accommodated in the sector of each wireless base station (step S22). The judgment of "the flow load that cannot be accommodated is large" is performed by a judgment process showing that the flow load that cannot be accommodated is greater than a predetermined value. For example, this judgment process makes this judgment when the channel utilization rate is greater than a predetermined value (for example, 80%), because a line utilization rate exceeding 100% will result in a high probability that the traffic cannot be accommodated. In addition, this judgment process makes this judgment when the call obstruction rate is equal to or greater than a predetermined value (for example, 15%) because a large amount of traffic load cannot be accommodated due to call loss.

Referring to FIG. 6, the extension point searching section 11a1 sets the points included in the predetermined area in the selected area as the wireless base station extension point in the base station extension section 11a, that is, changes data. The point (predetermined point) can be determined by the judgment of a person or the base station extension section 11a (step S03).

The following describes an example of a method in which the base station extension section 11a decides a predetermined point in the area selected by the extension point search section 11a1. If the outer center of the triangle with the three wireless base stations located closest to the selected area as the vertices (the outer center is a point with the same distance between the three vertices) is included in the selected area, the outer center is set to Book a point. If this is not the case, the point closest to the outer center is set as a predetermined point.

Next, the change target search section 11b1 searches for a wireless base station that changes the wireless parameter based on the current wireless parameter and the current flow data (step S04).

Here, the details of step S04 are explained with reference to FIG. 9, which is a flowchart showing the details of step S04.

First, the change target search section 11b1 performs the same processing (step S41) as the first processing (step S21) performed by the extension point search section 11a1. The wireless base stations around the area searched and selected in the first process are selected (step S42). That is, the change target search section 11b1 selects the sectors of the radio base stations located around the searched and selected area.

Next, the change target search section 11b1 performs the same processing (step S43) as the second processing (step S22) performed by the extension point search section 11a1. A radio base station that covers the area searched and selected in the second process is selected (step S44). Specifically, the change target search section 11b1 selects the sectors of the radio base station around the searched and selected area.

Third, when the data of the extension point of the wireless base station is input from the base station extension section 11a (step S03), the base station in the extension point is selected (step S45). Specifically, the change target search section 11b1 selects all sectors of the base station in the extension point.

The operation of changing the target search section 11b1 will be explained with reference to FIG. 8. The area selected according to the same processing as the first processing of the extension point search section 11a1 is the uncovered area A (step S41). Therefore, the change target search section 11b1 first selects the sectors b, c, f, and g around the uncovered area A (step S42).

The sector next selected by the change target search section 11b1 is the sector b, which is selected based on the same processing as the second slave processing performed by the extension point search section 11a1. If the data of the extension point of the wireless base station is input from the base station extension part 11a, the sector third selected by the change target search part 11b1 is all the sectors having the wireless base station in the input extension point.

Referring to FIG. 6, the change target search section 11b1 will select any radio base station (specifically, the fan of the radio base station) selected in the above-mentioned first selection (step S42), second selection (step S44), and third selection (step S45). Zone) is set as the wireless parameter change target base station (specifically, the sector of the wireless parameter change target base station). That is, the change target search section 11b1 sets any selected sector of the wireless base station in the wireless parameter change section 11b as a wireless parameter change target base station, that is, changes data (step S05). Which of the selected sectors of the wireless base station is set as the wireless parameter change target can be determined based on the judgment of a person or the wireless parameter change section 11b.

An example of a method in which the wireless parameter change section 11b decides the wireless parameter change target base station in the sector of the wireless base station searched by the change target search section 11b1 will be described below. Fig. 10 is a flowchart showing the details of step S05.

First, from the viewpoint that the deterioration rate is acceptable, among the sectors of the radio base station selected in the first selection (step S42) and the second selection (step S44) by the change target search section 11b1, select the ascending order of the deterioration rate Some sectors of the wireless base station having a high order in the arrangement (step S51). Otherwise, from the viewpoint that the traffic load to be accommodated is acceptable, some sectors of the radio base station having a high order in the ascending order of channel utilization can be selected from them (step S51). Next, when all sectors of the radio base station at the extension point selected in the third selection (step S45) by the change target search section 11b1 exist, all sectors included in the radio base station at the extension point are selected (step S52). The sector selected in this way is set as the wireless parameter change target.

The wireless parameter changing section 11b sets the change data to be changed to a predetermined value as a target wireless parameter in the wireless base station. The predetermined value may be determined by a person, or may be determined by the wireless parameter changing section 11b (step S06).

Here, when the wireless parameter changing part 11b decides the predetermined value, the wireless parameter changing part 11b is based on the input of the current wireless parameter stored in the wireless parameter storage part 15, the current flow data stored in the flow data storage part 12c, and the extension part from the base station. The data of the extension point of the wireless base station output by 11a changes the wireless parameter of the wireless base station to a predetermined value, and the data of the changed wireless parameter is output as the changed data.

An example of a specific method for deciding the predetermined value will be explained below. As a wireless parameter of a sector with a small channel utilization rate (for example, 50% or less) in the current traffic data, the transmission electric power is set to be a constant amount (for example, 1dB) greater than the current transmission electric power, so as to be able to accommodate The traffic can be increased more than the current state by expanding the wireless parameters and changing the coverage area of the target base station. Otherwise, in the depression angle direction, the antenna tilt angle as a wireless parameter is set to a constant angle (for example, one degree) smaller than the current angle. In addition, when the data of the extension point is input, each value of the antenna tilt angle and the transmission electric power shown in the wireless parameter of the sector of the wireless base station at the extension point is set as the wireless parameter of the sector of the surrounding wireless base station average of.

Next, the simulator 12a calculates the predicted traffic data configured by the predicted traffic load, the predicted channel utilization rate, and the predicted call failure rate in the wireless network changed according to the changed data (step S07).

The current flow income calculation section 12b1 calculates the income obtained based on the current flow load shown in the current flow data based on the input of the current flow data. For example, the current flow income calculation section 12b1 calculates the income obtained in one year (step S08).

The predicted flow calculation section 12b2 calculates the income obtained from the predicted flow load shown in the predicted flow data based on the input of the predicted flow data. For example, the predicted flow calculation section 12b2 calculates the predicted income obtained in one year (step S09).

The wireless parameter change cost calculation section 13a calculates various costs necessary for changing the wireless parameter based on the input of the data of the changed wireless parameter output by the wireless parameter change section 11b. For example, the wireless parameter change cost calculation section 13a calculates the annual expenditure necessary to change the wireless parameter (step S10).

The wireless base station expansion cost calculation section 13b calculates the cost necessary for the expandable wireless base station based on the input of the wireless base station expansion point data. For example, the wireless base station expansion cost calculation section 13b calculates the annual expenses necessary to expand the wireless base station (step S11).

The income and expenditure calculation part 14 obtains "increased income" by subtracting current flow income and forecast flow income. In addition, the income and expenditure calculation section 14 obtains the "increased expenditure" by adding the expenditure of the increased cost of the wireless base station and the expenditure of the change of the wireless parameter, which is caused by the expansion of the wireless parameter or the change of the wireless parameter.

Then, the income and expenditure calculation section 14 obtains the "expense" after the wireless parameter expansion or the wireless parameter change by adding the increased expenditure due to the expansion of the wireless base station and the change of the wireless parameter to the expenditure incurred so far. The expenses that have occurred so far are stored in the income and expense calculation section 14.

In addition, the income and expense calculation section 14 subtracts the obtained "expense" from the above-mentioned "income" to obtain the "profit", and divides the profit by the expense to obtain the "profit ratio" (step S12).

The income and expense calculation section 14 then outputs the profit rate, profit, income, increased income, expense, start of increase, expansion point of the wireless base station, and changed wireless parameters to the display panel 16 together. The display panel 16 displays them based on the output of the income and expenditure calculation section 14 (step S13).

Then, the change data is changed, and the operation shown in FIG. 6 is repeated.

FIG. 11 is a display example of the display panel 16. It should be noted that the display of the display panel 16 is not limited to the one shown in FIG. 11.

As shown in Figure 11, it shows how the profit margin increases by performing the expansion of the wireless base station and the change of the wireless parameters.

In the example shown in Figure 11, the situation with the highest profit rate is shown as "optimal". Profit, income, increased income, expenses, and increased expenses are displayed in the column to the right of the profit rate. In addition, the data of the extension point of the wireless base station and the changed wireless parameters are displayed as files in the column on the right edge.

In addition, the wireless network optimization support system 1 may be configured to include a memory for use as a recording medium read by a computer, and include a CPU for use as a computer. In this case, in the memory configuring the wireless network optimization support system 1, a program for the CPU is stored, which executes the above-mentioned method for supporting the wireless network change to be performed by the wireless network optimization support system 1. The CPU of the wireless network optimization support system 1 reads the program stored in the memory, and then executes the method for supporting the wireless network change based on the read program.

In addition, the program recorded in the memory configuring the wireless network optimization support system 1 may be recorded in a computer-readable recording medium such as an optical disc. In this case, a reading device is used to read the program recorded on a recording medium such as an optical disc, and the read program is recorded in the memory configuring the wireless network optimization support system 1. Then, the CPU configuring the wireless network optimization support system 1 can execute the above-mentioned method to support the wireless network change.

In the embodiment of the present invention, the extension point of the wireless base station and the change of the wireless parameters of the wireless base station are set, and then the profit margin, profit, income, and income and expenditure are output, which can be obtained through the above-mentioned settings and the content of the settings. The expenditure calculation part obtains the output corresponding to a plurality of change data, and obtains the data of the extension point of the base station to optimize the profit rate and the change of the wireless parameters of the wireless base station.

In the embodiment of the present invention, a place that is not covered by any sector of the wireless base station is a wide place (uncovered area), and there is a large traffic in each sector of the wireless base station around the uncovered area The location of the load can be used as the extension point of the wireless base station and the target of the wireless parameter change base station.

In this processing, by searching for locations with a large traffic load in the sectors of each radio base station around the uncovered area, an uncovered area predicted to have a large traffic load is searched.

By expanding the wireless base station in such a location, or changing the wireless parameters of the wireless base station, and setting the location as a coverage area, an uncovered area predicted to have a large traffic load can be changed into a coverage area. As a result, a larger traffic load can be accommodated, and profit margins can be increased.

In addition, in the embodiment of the present invention, the flow data based on the traffic load, channel utilization, call failure rate, etc. in the sector of each radio base station (that is, when the channel utilization is greater than a predetermined value or the call failure rate is greater than a predetermined In the case of value) searching for a location (sector of a wireless base station) that is predicted to have a large traffic load that cannot be accommodated, the target of the wireless base station extension point and the target base station for wireless parameter change can be obtained.

That is, by expanding wireless base stations to locations predicted to have a large amount of unaccommodated traffic load, or changing wireless parameters of wireless base stations in locations predicted to have a large amount of unaccommodated traffic load, traffic can be accommodated. As a result, greater traffic can be accommodated, and profit margins can be increased.

In the embodiment of the present invention, when searching for the extension point of the wireless base station, the order in which the extension point search section 11a1 performs the first process and the second process can be flexibly changed. In addition, when searching for the extension point of the wireless base station, the extension point search section 11a1 may perform one of the first or second processing.

Furthermore, in the embodiment of the present invention, when searching for a wireless base station whose wireless parameters are to be changed, the order in which the change target search section 11b1 performs the first, second, and third processing can be flexibly changed. In addition, the change target search section 11b1 can perform any one of the first, second, and point processes when searching for a wireless base station whose wireless parameters are to be changed.

In the embodiments of the present invention explained heretofore, the configurations shown in the drawings are merely examples, and the present invention is not limited to these configurations.

According to the present invention, when the wireless network is changed according to the change data, the profit and profit rate of the wireless service provider can be calculated, and thus, the change data of the wireless network data that increases the profit rate can be obtained. As a result, it is possible to propose the change data of the wireless network that can increase the profit margin.

In addition, by using the wireless base station extension point or the wireless parameters of the wireless base station as change data, it is possible to propose a "base station extension point" or "wireless parameter change in the wireless base station" that increases the profit margin.

Description of the drawings

Fig. 1 is a block diagram showing the configuration of a conventional wireless network; Fig. 2 is a block diagram showing another configuration of a conventional wireless network; Fig. 3 is a block diagram showing another configuration of a conventional wireless network; Fig. 4 is a diagram showing A block diagram of another configuration of a traditional wireless network is shown; FIG. 5 is a block diagram of the configuration of the wireless network change support system in an embodiment of the present invention; FIG. 6 is a flowchart of the operation of the embodiment of the wireless network change support system of the present invention Figure 7 is a flowchart showing the details of step S02; Figure 8 is a diagram showing the search performed by the extension point search section;

FIG. 9 is a flowchart showing details of step S04; FIG. 10 is a flowchart showing details of step S05; FIG. 11 is an example of display of the display panel 16.