JP7122269B2 - Radio configuration evaluation method and radio design support simulator - Google Patents

Description

The present invention relates to a radio design support simulator that cooperates with system design.

As background arts in this technical field, there are the following prior arts. Patent Document 1 (Japanese Patent Application Laid-Open No. 2018-7089) describes, ``A simulator of a wireless train control system that executes a wireless communication simulation and a train operation simulation in parallel, by executing a simulation applying an evaluation scenario. , evaluate the wireless communication resources of the wireless train control system,” and “if the wireless communication resources are modified based on the evaluation results of the wireless communication resources based on the simulation results, a modification plan based on the evaluation results. is created, and if the created revision proposal does not meet the predetermined high evaluation conditions, the revision proposal is repeatedly created, and when an evaluation that meets the predetermined high evaluation conditions is obtained, the correction proposal is officially decided. is stated.

JP 2018-7089 A

According to Patent Document 1, wireless communication resources can be evaluated using various evaluation scenarios regarding train operation.

However, the technology described in Patent Document 1 is a simulation related to train operation, and parameters input and output to the simulator differ depending on the type of system. No consideration is given to estimating wireless communication resources in the system.

In addition, in Patent Document 1, as a correction plan when the radio resource is insufficient, "when a situation occurs in which the time slot of a certain radio base station is insufficient, or when there is no margin, the time slot of the radio base station It is disclosed that the number of time slots in the entire wireless communication network is increased by increasing the upper limit number or increasing the number of wireless base stations to be arranged. In Patent Document 1, in addition to the number of base stations and time slots, radio communication resources include allocation of frequency channels, position, height, directivity, and gain of antennas of radio base stations, attenuators, handover preparation points, etc., but does not describe a specific method of using these resources in creating a correction proposal for the lack of radio resources.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless design support simulator that facilitates the combination of various system simulations and wireless communication simulations.

A representative example of the invention disclosed in the present application is as follows. That is, it is an evaluation method for evaluating a wireless configuration that provides wireless communication in a system using a computer, wherein the computer comprises an arithmetic unit that executes predetermined arithmetic processing, and a storage device that can be accessed by the arithmetic unit. and the evaluation method includes the number of people using the system and the number of people existing around the area where the system operates, which are system setting parameters set for the computing device to simulate the performance of the system. is obtained from a system performance calculation unit that simulates the performance of the system, and the arithmetic device converts the obtained system setting parameters to the number of interfering terminals or the interference that is the first parameter for simulating the performance of the radio power , and the computing device outputs the converted first parameter to a radio performance calculation unit that simulates the radio performance as a radio input parameter that is input for simulating the radio performance. characterized by

According to one aspect of the present invention, it is possible to provide a wireless communication simulator that cooperates with various system simulators. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a configuration diagram of a wireless design support simulator of Example 1. FIG. 4 is a sequence diagram showing the operation of the radio design support simulator of Example 1. FIG. 4 is a diagram showing an example of a parameter conversion table of Example 1; FIG. FIG. 5 is a diagram showing an example of a screen output from the user interface of the wireless design support simulator of the first embodiment; FIG. 4 is a diagram showing an example of a wireless parameter conversion table according to the first embodiment; FIG. 4 is a diagram showing an example of a coordinate conversion table of Example 1. FIG. FIG. 11 is a configuration diagram of a radio design support simulator of Example 2; FIG. 11 is a sequence diagram showing the operation of the radio design support simulator of Example 2; FIG. 10 is a diagram showing an example of an adjustment parameter determination table of Example 2; FIG. 11 is a configuration diagram of a wireless design support simulator of Example 3; FIG. 11 is a diagram showing an example of a propagation model selection table of Example 3; FIG. 12 is a diagram illustrating an example of a wireless performance conversion table of Example 3; 2 is a block diagram showing the physical configuration of the radio design support simulator of Example 1. FIG.

Several embodiments of the present invention will be described below with reference to the drawings.

For convenience, the following examples are divided into a plurality of sections or examples when necessary, but unless otherwise specified, they are not unrelated to each other, and one of them is the other. Some or all of them are related to modifications, details, supplementary explanations, and the like. Each embodiment may be implemented individually, or may be implemented in combination.

In addition, in the following examples, when referring to the number of elements (including the number, numerical value, amount, range, etc.), unless otherwise specified or clearly limited to a specific number in principle , is not limited to the specific number, and may be greater than or less than the specific number.

Furthermore, in the following examples, the constituent elements (including element steps, etc.) are not necessarily essential unless otherwise specified or clearly considered essential in principle. stomach.

Similarly, in the following examples, when referring to the shape, positional relationship, etc., of components, etc., unless otherwise specified or in principle clearly considered to be otherwise, the actual shape, etc. shall include those that are similar or similar to This also applies to numerical values and ranges.

Also, in the following description, the expression “xxx table” may be used to describe information from which an output is obtained for an input, but the information may be data of any structure.

Also, in the following description, the configuration of each table is an example, and one table may be divided into two or more tables, or all or part of two or more tables may be one table. good.

Also, in the following description, the function may be described using the expression “kkk unit”, but the function may be realized by executing one or more computer programs.

In the following embodiments, a general-purpose wireless LAN device is used as a component of the system, and at least part of the communication required for the system is performed wirelessly. In the following embodiments, wireless systems other than wireless LAN may be used as part of system components.

<Example 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6 and 13. FIG. FIG. 1 is a configuration diagram of the radio design support simulator 100. As shown in FIG. The radio design support simulator 100 includes a system performance calculation unit 101 that calculates system performance, a radio performance calculation unit 102 that calculates the radio performance in the radio system installed in the system, and a control unit that controls the operation of the radio design support simulator. 103 and a user interface 106 . Although the system performance calculation unit 101 and the radio performance calculation unit 102 are provided inside the radio design support simulator 100 for easy understanding of the invention, the system performance calculation unit 101 and the radio performance calculation unit 102 may be provided outside the radio design support simulator 100 .

The system performance calculation unit 101 executes a system simulation that calculates system performance using set parameters for system design or performance evaluation (e.g., elevator system, guidance robot system, train operation system). The system performance calculation unit 101 may be composed of a separate computer, or may be composed of a program that runs on the same computer as the wireless performance calculation unit 102 and the control unit 103 . The system performance calculator 101 can calculate the system performance for various items by changing the simulator to be used. Hereinafter, main evaluation items in system simulation are referred to as simulation items. For example, in a simulation that calculates the average waiting time for each floor of an elevator system, the system performance calculation unit 101 calculates the speed of the car, the capacity of the car, the number of people waiting on each floor and the frequency of occurrence, the floor to get on and the time to get off. Floor information and the like are input or set parameters, and the average waiting time of each floor is output as an evaluation item (see parameter conversion table 105 shown in FIG. 3). In addition, in a simulation that calculates the transport capacity of an elevator system when multiple cars are operated, information on the floors each car stops at, the number of people waiting on each floor and the frequency of occurrence, information on the boarding and alighting floors, etc. are input or set as parameters. Output the transport capacity (the number of people that can be transported per unit time) as an evaluation item. In addition, in the simulation to calculate the operation rate of the guidance robot system, the number of robots operating at the same time, the movement speed of the guidance robot, the guidance destination, the frequency of occurrence of guidance requesters, etc. are input or set parameters, and the evaluation items of the robot are Output the operating rate. In addition, in a simulation that calculates the occupancy rate of the train operation system, the train operation schedule, the number of people waiting at the station and the frequency of occurrence, the station to get on and off the train, etc. are input or set parameters, and the occupancy rate of the train is used as an evaluation item. to output

The radio performance calculator 102 executes a radio simulation to calculate radio system performance using configuration parameters for radio system design or performance evaluation. The wireless performance calculation unit 102, for example, the placement of wireless devices (access points, slave devices), the placement of interference sources, the frequencies and modulation schemes used, the radio wave propagation model indicating the propagation environment, etc., are input or set parameters, and evaluated. As items, wireless system performance such as received power, packet error rate, and delay is output. For example, in general, in an environment with many obstructions, the received power decreases, and in an environment with a large amount of interference, the packet error rate and delay time increase. more likely to increase.

The control unit 103 includes an operation control unit 107 that controls simulation operations, and a parameter conversion unit 104 . The parameter conversion unit 104 uses the simulation item simulated by the system performance calculation unit 101 as an index, and at least one of a system setting parameter of the system performance calculation unit 101 and a system output parameter output by the system performance calculation unit 101 as a simulation result. is converted into either a wireless setting parameter of the wireless performance calculation unit 102 or a wireless input parameter input to the wireless performance calculation unit 102 . In Example 1, the parameter conversion unit 104 converts parameters using the parameter conversion table 105 .

The radio design support simulator 100 of the first embodiment evaluates the radio communication performance in the system using at least part of the settings used in the calculation and the results output by the system performance calculator 101 . The setting parameters of the system performance calculation unit 101 and the parameters used for outputting the results are hereinafter referred to as system setting/output parameters. Similarly, setting parameters of the wireless performance calculation unit 102 and input parameters are referred to as wireless setting/input parameters.

FIG. 13 is a block diagram showing the physical configuration of the radio design support simulator 100 of the first embodiment.

A wireless design support simulator 100 of this embodiment is configured by a computer having a processor (CPU) 11 , a memory 12 , an auxiliary storage device 13 and a communication interface 14 . The wireless design support simulator 100 may have an input interface 15 and an output interface 18 .

The processor 11 is an arithmetic device that executes programs stored in the memory 12 . Various functions of the wireless design support simulator 100 are realized by the processor 11 executing various programs. Note that part of the processing performed by the processor 11 by executing the program may be performed by another computing device (for example, FPGA).

The memory 12 includes ROM, which is a non-volatile storage element, and RAM, which is a volatile storage element. The ROM stores immutable programs (eg, BIOS) and the like. RAM is a high-speed and volatile storage element such as DRAM (Dynamic Random Access Memory), and temporarily stores programs executed by the processor 11 and data used when the programs are executed.

The auxiliary storage device 13 is, for example, a large-capacity, non-volatile storage device such as a magnetic storage device (HDD) or flash memory (SSD). Auxiliary storage device 13 also stores data used by processor 11 when executing programs (for example, parameter conversion table 105, etc.) and programs executed by processor 11 . That is, the program is read from the auxiliary storage device 13 , loaded into the memory 12 , and executed by the processor 11 to realize each function of the wireless design support simulator 100 .

The communication interface 14 is a network interface device that controls communication with other devices according to a predetermined protocol.

The input interface 15 is an interface to which input devices such as a keyboard 16 and a mouse 17 are connected and receives input from an operator. The output interface 18 is an interface to which output devices such as a display device 19 and a printer (not shown) are connected, and which outputs results of program execution in a format that can be visually recognized by an operator. The user terminal 30 connected to the wireless design support simulator 100 via the network 20 may provide an input device and an output device so that access can be made from a remote location. In this case, the radio design support simulator 100 may have a server function, and the user terminal 30 may access the radio design support simulator 100 (server) using a predetermined protocol (for example, http).

Programs executed by processor 11 are provided to wireless design support simulator 100 via removable media (CD-ROM, flash memory, etc.) or a network, and stored in non-volatile auxiliary storage device 13, which is a non-temporary storage medium. be. Therefore, the wireless design support simulator 100 preferably has an interface for reading data from removable media.

The wireless design support simulator 100 is a computer system configured on one physical computer or on a plurality of logically or physically configured computers, and is built on a plurality of physical computer resources. It may run on a virtual machine. In particular, the system performance calculation unit 101, the radio performance calculation unit 102, and the control unit 103 may operate on separate physical or logical computers, or may be combined to operate on one physical or logical computer. It may work with

The operation sequence of the radio design support simulator 100 according to the first embodiment will be described with reference to FIG. The user uses the user interface 106 to input the setting parameters of the system performance calculation unit 101 and the setting parameters of the radio performance calculation unit 102 to the control unit 103 (S202, S203). The control unit 103 outputs the input setting parameters of the system performance calculation unit 101 to the system performance calculation unit 101 (S204). The system performance calculator 101 calculates system performance (S205) and outputs the calculation result to the controller 103 (S206). Using the parameter conversion table 105, the control unit 103 converts the system settings/output parameters output from the system performance calculation unit 101 into wireless settings/input parameters (S207). , and outputs the setting parameters input by the user to the wireless performance calculation unit 102 (S208). The wireless performance calculation unit 102 calculates the wireless performance using the input wireless settings/input parameters (S209), and notifies the user interface 106 of the calculation result (S210).

The wireless design support simulator of the first embodiment can detect the effects of parameters that directly or indirectly affect wireless performance among setting parameters used for calculating system performance and parameters output as a result of system simulation. , holds the parameter conversion table 105 shown in FIG. The parameter conversion table 105 includes simulation items 301 , system setting/output parameters 302 , and wireless setting/input parameters 303 . used to convert. The system setting/output parameters 302 include system setting parameters set for simulating system performance and system output parameters output as a result of simulating system performance. The wireless setting/input parameters 303 include wireless setting parameters set for simulating wireless performance in the wireless system and wireless input parameters input for simulating wireless communication performance.

For example, if the simulation item 301 is "average waiting time for each floor of the elevator system", the system simulation includes the speed of the car, the capacity of the car, the number of people waiting on each floor and the frequency of occurrence, information on the boarding and alighting floors, etc. is the setting parameter of the simulation conditions, and the average waiting time of each floor is output.

In addition, when the simulation item 301 is "transportation capacity when operating multiple cars in an elevator system", the system simulation includes information on the floors stopped by each car, the number of people waiting on each floor and the frequency of occurrence, information on the boarding and alighting floors, etc. is a setting parameter, and the transport capacity (the number of people that can be transported per unit time) is output. The parameter conversion table 105 of the first embodiment describes, as other examples of simulation items, the operation rate of the guidance robot system and the boarding rate of the train operation system.

In this embodiment, since it is assumed that the system uses a general-purpose wireless LAN or wireless communication that uses the same frequency as the wireless LAN, there are system users who have wireless LAN terminals that communicate on the same frequency as the system. is assumed. In other words, it is considered that a certain percentage of system users interferes with wireless communications performed by the system.

In the radio design support simulator of the first embodiment, when the simulation item 301 is "average waiting time of each floor of the elevator system", the system simulation of the system performance calculation unit 101 is based on the car speed, car capacity, each floor Calculate the average waiting time for each floor for various conditions such as the number of people waiting at the floor, frequency of occurrence, boarding floor and alighting floor information. In a system simulation, if the number of people in a car, the number of people waiting on the floor, or the waiting time changes, as a result, the state of interference will change, and the wireless communication performance will also change.

In the first embodiment, the control unit 103 uses the parameter conversion table 105 to convert the system settings/output parameters set and output by the system performance calculation unit 101 into wireless settings/input parameters. The radio performance calculation unit 102 calculates the radio performance by incorporating the calculation result. Therefore, the performance of wireless communication with respect to system operation can be evaluated with high accuracy.

Also, if the system uses a general-purpose wireless LAN, there is a possibility that the delay time will increase if there are terminals using the same frequency. Assuming that the ratio is the number of wireless LAN terminal users, the number of users may be used as the number of interfering terminals. In addition, for systems that use wireless communication that are not general-purpose wireless LAN systems, the number of wireless LAN users using the same frequency is not converted into the number of interfering terminals, but is converted into interference power. good.

In the simulation where the simulation item 301 calculates the "operation rate of the guidance robot system", the number of robots operating at the same time depends on the number of terminals operating at the same time and the setting parameters of the wireless communication resources allocated to one terminal. converted. Also, the guidance range of the robot is converted into a setting parameter for the operation range of the terminal, and wireless performance is calculated.

Next, the parameter conversion table 105 in Example 1 will be described using FIG. The parameter conversion table 105 shown in FIG. 3, for example, converts "the number of people waiting on each floor and the frequency of occurrence" into "the number of interfering terminals outside the car and the pattern of occurrence of interference signals", and converts the "boarding floor and getting off floor" into " The number of interfering terminals in the car and the generation time of the interfering signal are converted into "interference signal generation time". can be regarded as the number of interfering terminals. In addition to the parameter conversion table 105, an auxiliary table describing more specific numerical values and detailed conversion methods may be provided, and the contents of the auxiliary table may be changed according to the environment in which the system is used.

The parameter conversion table 105 shown in FIG. 3 is merely an example, and may include other simulation items, system settings/output parameters, and wireless settings/input parameters. 302 and wireless setting/input parameters 303 may be added, deleted, and changed. For example, simulation items related to data collection of sensors in the factory may be added, and by configuring the parameter conversion table 105 in this way, the system simulator used in the system performance calculation unit 101 can be freely added and changed. .

Even if the system simulation settings and outputs differ depending on the simulation items in this way, the parameter conversion unit 104 allows various system simulators to cooperate with the radio simulator.

Also, by realizing the parameter conversion unit 104 with the parameter conversion table 105 whose content can be added and changed, the radio performance calculation unit and various system performance calculation units are combined to simulate the radio performance for various systems. can.

FIG. 4 shows an example of a screen 400 output from the user interface 106 of the wireless design support simulator 100 of the first embodiment. The screen 400 displays items that can be simulated by the system performance calculation unit 101, and the user inputs simulation items before setting parameters in the system performance calculation unit 101 in step S202. Although FIG. 4 shows an example of a graphical user interface (GUI), it may be a character user interface (CUI). In Embodiment 1, the user may select a simulation item using this GUI, and the parameter conversion unit 104 of the control unit 103 may operate based on the selection. The user can easily use the function of the parameter conversion unit 104 by selecting a simulation item using the user interface in this way.

In the operation sequence shown in FIG. 2, the results of the system performance calculation (S205) are used to calculate the wireless performance (S209). , the performance of the system may be calculated. At this time, parameter conversion section 104 should have wireless parameter conversion table 500 shown in FIG.

At least some of the configuration parameters used in the radio performance calculation and the parameters output as a result of the radio performance calculation affect the system performance calculation. For example, the received power of a wireless device affects whether or not communication is possible and the amount of information that can be transmitted. Also, even if communication is possible, if the delay time allowed by the system is exceeded, the system is considered to be unable to communicate.

As shown in FIG. 5, the wireless parameter conversion table 500 includes a simulation item 501, a wireless setting/output parameter 502, and a system setting/input parameter 503. Using the simulation item 501 as an index, the wireless setting/output parameter 502 is used as a system setting. - Used to transform the input parameters 503; Radio parameter conversion table 500 converts radio parameters into system parameters, contrary to parameter conversion table 105 shown in FIG.

For example, if the simulation item 501 is "average waiting time of each floor of the elevator system", the "receiving power" of the wireless setting/output parameter 502 is set to "communication is impossible if the receiving power is less than [A] dBm for [B] seconds. The performance of the system is calculated by converting it into the setting parameter "deemed as The same applies to "packet error rate (PER)", "delay" and "throughput". Similarly, when the simulation item 501 is the "operation rate of the guidance robot system", the "receiving power" is set to the setting parameter "deem communication impossible when the receiving power is less than [a] dBm for [b] seconds". Transform and calculate system performance. The same applies to "packet error rate (PER)", "delay" and "throughput".

Whether or not communication is possible depends on the "received power", but some systems are designed so that, for example, a single failure of communication is not regarded as an error, but if this state continues for a certain period of time, it is regarded as an error. Similarly, PER, delay, and throughput may be designed such that when certain conditions exceed the range allowed by the system, communication is considered impossible. In general, acceptable ranges for received power, PER, delay, and throughput are system dependent.

As described above, in the calculation of wireless performance, even the single parameter "received power" has different effects depending on the system. In the first embodiment, the wireless setting/output parameter 502 is converted into the system setting/input parameter 503 using the simulation item 501 as an index, so that the wireless performance calculation result can be appropriately fed back to calculate the system performance.

Further, the wireless parameter conversion table 500 shown in FIG. 5, for example, converts "receiving power" into "communication is considered impossible when the state of receiving power less than [A] dBm continues for [B] seconds". However, in the wireless parameter conversion table 500, there are more detailed descriptions such as “If the received power is less than [A] dBm and continues for [B] seconds, communication is considered impossible”, “[A] dBm or more [M] If the state of less than [N] seconds continues, the amount of information that can be communicated is considered to be L %.", the contents of conversion may be changed according to the value of the received power. In addition to the wireless parameter conversion table 500, an auxiliary table describing more specific numerical values and detailed conversion methods is provided, and the contents of the auxiliary table are changed according to the environment in which the system is used and the requirements of the system. It may be configured as

Also, the parameter conversion unit 104 may have a coordinate conversion table 600 shown in FIG. The coordinate conversion table 600 holds correspondence between simulation items 601, locations (names, position coordinates, etc.) 602 in the system simulation range, and locations 603 in the wireless simulation. The parameter conversion unit 104 converts the location 602 in the system simulation into the coordinates (direction, distance) in the wireless simulation, so that, for example, as shown in FIG. can be converted into an azimuth angle and a distance from a wireless device (for example, a wireless LAN access point) with which the mobile terminal communicates. Coordinate transformation table 600 allows wireless performance to be evaluated without modifying the system simulator, even if the system simulator uses parameters for specific locations.

Although the parameter conversion table 105 is used in the first embodiment, it is obvious that the same effect can be obtained by using another method, for example, a function whose content can be added or changed.

<Example 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. 7 to 9. FIG. In the second embodiment, differences from the above-described embodiments will be mainly described, and the same reference numerals will be given to the same configurations as in the first embodiment, and the description thereof will be omitted.

FIG. 7 is a configuration diagram of the radio design support simulator 700 according to the second embodiment, and FIG. 8 is an operation sequence of the radio design support simulator 700 according to the second embodiment. In addition to the configuration of the first embodiment, the second embodiment further includes a wireless configuration adjustment unit 701 as a component. The main difference between the second embodiment and the first embodiment is that the wireless configuration adjustment unit is used to simulate a wireless configuration suitable for the wireless performance required by the system.

The operation of the radio design support simulator of the second embodiment will be described with reference to FIGS. 7 and 8. FIG. The user uses the user interface 106 to input the setting parameters of the system performance calculation unit 101, the setting parameters of the radio performance calculation unit 102, and the calculation conditions of the radio configuration adjustment unit 701 to the control unit 103 (S202, S203). , S801). The calculation conditions of the wireless configuration adjustment unit 701 are the objective function used by the objective function calculation unit 705 and the termination condition used by the termination condition determination unit 706 in the wireless configuration adjustment unit 701 .

The control unit 103 outputs the setting parameters of the system performance calculation unit 101 to the system performance calculation unit 101 (S204), the system operation calculation unit 709 of the system performance calculation unit 101 calculates the system operation (S802), and the result is output to the control unit 103 (S803).

Using the parameter conversion table 105, the control unit 103 converts the system settings/output parameters output from the system performance calculation unit 101 into wireless settings/input parameters (S207). , and outputs the setting parameters input by the user to the wireless performance calculation unit 102 (S208). Also, the control unit 103 outputs the calculation conditions of the wireless configuration adjusting unit 701 to the wireless configuration adjusting unit 701 (S804).

The wireless performance calculation unit 102 calculates wireless performance using the input wireless settings/input parameters (S209), and outputs the calculation result to the system performance calculation unit 101 (S805). The system requirement determination unit 710 of the system performance calculation unit 101 determines whether or not the wireless performance calculated by the wireless performance calculation unit 102 satisfies the system requirements (S806). A value input by the user as a setting parameter of the system performance calculation unit 101 is used to determine the system requirements.

System performance calculation section 101 outputs the determination result of the system requirement to wireless configuration adjustment section 701 (S807). Although not shown in the figure, it is preferable to output a more detailed result indicating the degree of satisfaction in addition to the binary value of satisfied or not satisfied as the determination result.

The objective function calculation unit 705 of the wireless configuration adjustment unit 701 calculates an objective function using the input determination result of the system request (S808). The termination condition determination unit 706 determines termination or continuation of the simulation using the termination condition (S809). If the termination condition is not satisfied, the next calculation parameter determination unit 704 uses an optimization algorithm (eg, genetic algorithm) to determine radio parameters to be used for the next calculation (S810). The wireless configuration adjustment unit 701 outputs the determined wireless parameters to be used for the next calculation to the wireless performance calculation unit 102 (S811).

The wireless performance calculator 102 calculates the wireless performance using the wireless parameters determined by the wireless configuration adjuster 701 and used for the next calculation (S209). In the second embodiment, the processing from step S209 to step S811 is repeated until the termination condition is satisfied (S812). When the termination condition is satisfied, the user is notified of the system requirement determination result satisfying the termination condition and the calculation parameters used (S813).

In FIG. 8, after determining the termination condition (S809), determination of the next calculation parameter (S810) and output of the next calculation parameter (S811) are executed. If so, the process proceeds to step S813 without executing the processes of steps S810 and S811.

As described above, the radio configuration adjustment unit 701 of the second embodiment uses an objective function and an optimization algorithm to perform calculations for proposing a radio configuration that satisfies system requirements. Algorithms may also be used. In addition, the termination conditions set in the wireless configuration adjustment unit 701 include when a desired result is obtained, for example, when a preset threshold value is exceeded, the upper limit of the number of calculations, and the upper limit of the calculation time. may be used as the termination condition. When the upper limit of the number of calculations or the calculation time is set as the termination condition, it is preferable to execute a process of counting the number of calculations or the calculation time after calculating the objective function.

In the second embodiment, the wireless configuration adjustment unit 701 is used to adjust the wireless settings/input parameters so that the wireless configuration is suitable for the system requirements. Adjusting the radio configuration while changing requires a lot of man-hours.

Therefore, in the second embodiment, as shown in FIG. 7, a radio design support simulator 700 is provided with an adjustment parameter determination unit 702 . Adjustment parameter determination section 702 uses, for example, adjustment parameter determination table 703 to determine wireless parameters to be adjusted in accordance with system requirements. In the configuration shown in FIG. 7, adjustment parameter determination section 702 is provided in wireless configuration adjustment section 701 , but may be provided in control section 103 .

An example of the adjustment parameter determination table 703 is shown in FIG. In the adjustment parameter determination table 703 shown in FIG. 9, using the simulation item 901 as an index, main wireless communication requirement items 902 of each system, wireless setting/input parameters 904 to be adjusted by the wireless configuration adjustment unit, and adjustment parameters. An order 903 is recorded.

Low error rates and low delays are generally required when transmitting control signals for systems that move people, such as elevators and trains, by wireless communication.

In a system that requires a low error rate and low delay, in order to reduce radio wave interference, it is necessary to adjust the frequency used, adjust the installation position of the radio, and use n-to-n instead of one-to-one communication. (n is an integer of 2 or more) to adjust the redundancy. At the stage of adjusting the installation position of the wireless device, the direction of the antenna, the directivity of the antenna to be used, etc. may be adjusted.

Also, when using two or more sets of radios, if the desired performance is not obtained even if the positions of the radios are adjusted to obtain the diversity effect, an additional set of radios should be added. good too. The number of terminals and base stations may also be adjusted if the system requires low error rate and low delay but the system includes multiple terminals and multiple base stations.

On the other hand, as another example, in a guidance robot system in which information is transmitted and received by wireless communication between a robot and its control center, the robot acquires information such as guidance destinations from the user while collecting various information about its surroundings. , transmitting at least a portion of the information obtained from the user to the control center. For this reason, wireless communication between the robot and the robot's control center generally requires high throughput. In that case, it is preferable to adjust the frequency used to reduce radio wave interference, or to adjust the modulation method (for example, the multi-level number in modulation) to improve throughput. Also, if the desired throughput cannot be obtained in a place where the received power is low within the movement range of the robot, the installation locations of the base stations and the number of base stations are adjusted. In this way, there are radio parameters that should be preferentially adjusted in order to realize a radio configuration that meets system requirements.

In the second embodiment, the adjustment parameter determination unit 702 uses the simulation item 901 of the adjustment parameter determination table 703 as an index to determine the parameters to be adjusted and the order of adjusting the parameters. A suitable radio configuration can be proposed.

In FIG. 9, in order to reduce interference with wireless communication performed by the system, in any simulation item 901, the first adjustment order 903 is set to "frequency to be used". If the unused frequencies are known, simulations using the unused frequencies can be performed, and adjustment by optimization using the simulations can be performed from the second item.

Further, even for the same simulation items, it may be better to change the order of adjustment depending on the environment in which the system operates. Therefore, the adjustment parameter determination table 703 should be configured so that the contents can be added and changed.

The outline of the operation of the simulator of the second embodiment has been explained using FIG. may be provided with two functional units: a reception power calculation unit 707 for calculating physical layer level reception power and an error rate/delay calculation unit 708 for calculating IP layer level error rate and delay. With such a configuration, the reception power calculation unit 707 roughly examines the quality of the radio configuration at the power level, and calculates the IP layer level packet error rate and delay for the radio configuration determined to have good reception power. A radio design support simulator may be operated to calculate. As a result, a radio configuration suitable for system requirements can be efficiently presented.

<Example 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. 10 to 12. FIG. In the third embodiment, differences from the above-described embodiments will be mainly described, and the same components as those of the above-described embodiments will be given the same reference numerals, and their descriptions will be omitted.

FIG. 10 is a configuration diagram of a radio design support simulator 1000 according to the third embodiment. The main difference between the third embodiment and the second embodiment is that a condition setting unit 1001 is included as a component.

Condition setting section 1001 includes adjustment parameter determination section 702 , system-wireless conversion section 1002 and objective function/termination condition creation section 1003 . Further, the third embodiment differs from the second embodiment in that the control section 103 is provided in the wireless configuration adjustment section 701 and the adjustment parameter determination section 702 is provided in the condition setting section 1001 . Condition setting section 1001 has a function of setting operating conditions for at least one of system performance calculation section 101 , radio performance calculation section 102 and radio configuration adjustment section 701 .

The system-wireless converter 1002 converts the user's system requirements into wireless requirements and parameters and models used by the wireless performance calculator 102 .

This function is implemented by, for example, a propagation model selection table 1100 shown in FIG. Propagation model selection table 1100 includes simulation items 1101 , usage environment 1102 , and propagation model 1103 used in wireless performance calculation section 102 . Simulation items 1101 and use environment 1102 candidates from the propagation model selection table 1100 may be displayed on the user interface 106, and the user may select desired items to determine the propagation model 1103 of the wireless performance calculation unit 102. good. With such a configuration, even if the user is not familiar with wireless propagation models, simulation can be performed using a propagation model suitable for the usage environment.

Further, system-wireless conversion section 1002 may hold wireless performance conversion table 1200 shown in FIG. The wireless performance conversion table 1200 includes a wireless configuration redundancy 1202 and a wireless performance target to satisfy a system request 1201 from a user, such as "the system should be stopped N times or less in X years." Contains the value 1203. Wireless performance conversion table 1200 is desirably created by examining assumed simulation items and system requirements for the simulation items in advance, but the contents may be expanded according to the addition of system requirements 1201 .

The wireless performance conversion table 1200 shown in FIG. 12 displays candidates for the system requirements 1201 on the user interface 106, and the user selects the desired system requirements to determine the target values of the redundancy of the wireless configuration and the wireless performance. It may be configured as By adopting such a configuration, even if the user is not familiar with wireless communication, system requirements can be converted into wireless requirement specifications, and a wireless configuration suitable for system requirements can be simulated.

The objective function/termination condition creation unit 1003 creates an objective function and termination conditions used by the wireless configuration adjustment unit 701 . In the second embodiment, the user inputs the objective function and the termination condition. Create an objective function and termination conditions. For example, it prompts the user interface 106 for system requirements and creates an objective function and termination conditions based on the user's input. For example, if the user's request is "first priority: reliability, second priority: cost", terms related to wireless performance and terms related to cost, such as the number of wireless devices converted from the redundancy of wireless devices and their maintenance Create an objective function that includes costs and weights according to priority.

Also, the termination condition is set such as satisfying the wireless performance determined by the wireless performance conversion table 1200 shown in FIG. In this way, the radio design support simulator sets the objective function and the termination condition, thereby reducing the load on the user when using the radio design support simulator.

In the third embodiment, the objective function/termination condition creation unit 1003 is provided in the condition setting unit 1001 , but may be provided in the wireless configuration adjustment unit 701 .

With the above-described condition setting section 1001, even if the user does not have sufficient knowledge of wireless communication, the wireless design support simulator 1000 can be used to simulate a wireless configuration suitable for system requirements.

As described above, according to the wireless design support simulator of the embodiment of the present invention, the parameter conversion unit 104 acquires system setting/output parameters from the system performance calculation unit 101, converts them into wireless setting/input parameters, Since the converted wireless settings/input parameters are output to the wireless performance calculation unit 102 for simulating wireless performance, it becomes easy to combine various system simulations and wireless communication simulations, and it is possible to cooperate with various system simulators. A wireless communication simulator can be provided. Therefore, the performance of wireless communication used in various systems can be evaluated.

In addition, the parameter conversion unit 104 executes parameter conversion processing according to the parameter conversion table 105 in which parameters to be converted are described using simulation items of system performance as indices. Can be implemented.

In addition, since the parameter conversion table 105 includes information for converting at least one information of a person using the system and a person existing around the area in which the system operates into information of interference to wireless communication in the system, The effects of user interference can be captured as wireless settings and input parameters.

Further, the parameter conversion unit 104 acquires at least one of the wireless setting/output parameters from the wireless performance calculation unit 102, converts them into system setting/input parameters, and converts the converted parameters into system parameters for simulating system performance. Since the data is output to the performance calculation unit, it is possible to appropriately feed back the calculation results of the wireless performance and simulate the performance of the system.

In addition, since the user interface 106 generates display data (screen 400) for providing a user interface that allows selection of items for simulating system performance, there is no need to individually select wireless settings/input parameters. Users can easily simulate wireless performance.

Moreover, since the user interface 106 provides a user interface having a function that can be accessed from a remote location, wireless simulation can be performed from the user terminal 30 at a remote location without carrying computational resources.

In addition, the condition setting unit 1001 (system-wireless conversion unit 1002) refers to the propagation model selection table 1100 and converts the information of the environment in which the system is used into the information of the propagation model used for simulating the wireless performance. , according to the environment in which the system is installed, the radio can be calculated with high accuracy.

In addition, the radio configuration adjustment unit 701 repeatedly performs calculations in the radio performance calculation unit 102, or repeatedly performs calculations while cooperating the system performance calculation unit 101 and the radio performance calculation unit 102, so as to meet the requirements of the system. Searching for the wireless configuration, the adjustment parameter determination unit 702 determines the wireless setting/input parameters to be adjusted using the system simulation items as indices. can be preferentially adjusted, and a wireless configuration suitable for system requirements can be presented with a small number of calculations.

Further, the adjustment parameter determination unit 702 determines the parameters to be adjusted according to the adjustment parameter determination table 703, which describes the wireless setting/input parameters to be adjusted, using the system simulation items as an index, so that the user can make sufficient adjustments for wireless communication. Even if you do not have the necessary knowledge, you can perform a simulation that adjusts wireless communication parameters in an order suitable for the system.

In addition, condition setting section 1001 sets operating conditions for at least one of system performance calculation section 101, wireless performance calculation section 102, and wireless configuration adjustment section 701. Therefore, even if the user does not have sufficient knowledge of wireless communication, However, it is possible to perform simulations with parameters that are suitable for system requirements, and to obtain appropriate solutions early.

It should be noted that the present invention is not limited to the embodiments described above, but includes various modifications and equivalent configurations within the scope of the appended claims. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and the present invention is not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment may be replaced with the configuration of another embodiment. Moreover, the configuration of another embodiment may be added to the configuration of one embodiment. Further, additions, deletions, and replacements of other configurations may be made for a part of the configuration of each embodiment.

In addition, each configuration, function, processing unit, processing means, etc. described above may be realized by hardware, for example, by designing a part or all of them with an integrated circuit, and the processor realizes each function. It may be realized by software by interpreting and executing a program to execute.

Information such as programs, tables, and files that implement each function can be stored in storage devices such as memories, hard disks, SSDs (Solid State Drives), or recording media such as IC cards, SD cards, and DVDs.

In addition, the control lines and information lines indicate those considered necessary for explanation, and do not necessarily indicate all the control lines and information lines necessary for mounting. In practice, it can be considered that almost all configurations are interconnected.

100, 700, 1000 Radio design support simulator 101 System performance calculation unit 102 Radio performance calculation unit 103 Control unit 104 Parameter conversion unit 106 User interface 701 Radio configuration adjustment unit 702 Adjustment parameter determination unit 1001 Condition setting unit

Claims (12)

An evaluation method for evaluating a radio configuration that provides radio communication in a system using a computer,
The computer has an arithmetic device that executes predetermined arithmetic processing and a storage device that can be accessed by the arithmetic device,
The evaluation method is
The computing device simulates the performance of the system, based on the number of people using the system and the number of people existing around the area in which the system operates, which are system setting parameters set for simulating the performance of the system. Obtained from the system performance calculator,
The arithmetic unit converts the obtained system setting parameter into the number of interfering terminals or interference power, which is the first parameter for simulating the radio performance,
The arithmetic unit outputs the converted first parameter to a radio performance calculation unit that simulates the radio performance as a radio input parameter that is input for simulating the radio performance. evaluation method. The evaluation method according to claim 1,
the storage device has a parameter conversion table describing the system setting parameters and the first parameters;
An evaluation method , wherein processing for converting the first parameter is executed according to the parameter conversion table . The evaluation method according to claim 1,
The computing device acquires a wireless output parameter output as a result of the wireless performance simulation from the wireless performance calculation unit,
the computing unit transforms the radio output parameter into a second parameter for simulating performance of the system;
The evaluation method, wherein the arithmetic unit outputs the converted second parameter as the system setting parameter to the system performance calculation unit. The evaluation method according to claim 1,
The evaluation method, wherein the arithmetic unit generates display data for providing a user interface that allows selection of simulation items associated with the system setting parameters. The evaluation method according to claim 4,
The evaluation method, wherein the computing device provides a user interface having a function that can be accessed even from a remote location. The evaluation method according to claim 1,
The evaluation method, wherein the arithmetic unit converts information of an environment in which the system is used into information of a propagation model used for simulation of the performance of the radio. The evaluation method according to claim 1,
The computing device is
searching for a radio configuration suitable for the requirements of the system by repeatedly simulating the performance of the radio, or by repeatedly simulating the performance of the system and simulating the performance of the radio in cooperation with each other;
An evaluation method, wherein the items for simulating performance of the system are used as indices to determine wireless input parameters to be adjusted in the next repeated simulation. The evaluation method according to claim 7,
The storage device stores an adjustment parameter determination table in which the item to be simulated and the wireless input parameter to be adjusted are described in association,
The evaluation method, wherein the calculation device determines the wireless input parameter to be adjusted using the item to be simulated as an index according to the adjustment parameter determination table. The evaluation method according to claim 7,
The evaluation method, wherein the arithmetic unit sets at least one operating condition of the system performance simulation, the radio performance simulation, and the radio configuration search. A radio design support simulator for evaluating the configuration of a radio that provides radio communication in a system,
A computer comprising an arithmetic device that executes predetermined arithmetic processing to realize each functional unit and a storage device that can be accessed by the arithmetic device,
having a parameter conversion unit that converts parameters used in the simulation;
The parameter conversion unit is
The number of people using the system and the number of people existing around the area in which the system operates, which are system setting parameters set to simulate the performance of the system, are obtained from a system performance calculation unit that simulates the performance of the system. Acquired,
converting the obtained system configuration parameter into the number of interfering terminals or interference power, which is a first parameter for simulating the calculation of the wireless communication;
A radio design support simulator characterized in that the converted first parameter is output to a radio performance calculation unit for simulating the radio performance as a radio input parameter to be inputted for simulating the radio performance. . A radio design support simulator according to claim 10,
A radio that searches for a radio configuration suitable for the requirements of the system by performing repeated calculations in the radio performance calculation unit or by repeatedly performing calculations while cooperating the system performance calculation unit and the radio performance calculation unit. A configuration adjustment unit is provided,
The wireless design support simulator, wherein the wireless configuration adjustment unit has a parameter determination unit that determines wireless input parameters to be adjusted using a simulation item indicating performance of a system to be simulated as an index. The radio design support simulator according to claim 11,
A radio design support simulator, comprising: a condition setting section for setting operating conditions for at least one of the system performance calculation section, the radio performance calculation section, and the radio configuration adjustment section.

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