JP6077987B2 - Radio frequency management apparatus and method - Google Patents

Description

  The present invention relates to a radio frequency management apparatus and method for managing radio frequencies that cannot be used by a radio system by using an unusable frequency list.

  In a wireless system used in a plant or a building, the stability of communication may be lowered due to interference with other wireless systems. The radio wave environment changes over time due to new installations of other wireless systems and changes in usage conditions, so radio frequencies that were in good condition may become frequencies that interfere now. . On the other hand, a radio frequency that was previously unstable due to interference with other radio systems may now be used stably.

  In view of this, a technique has been proposed in which radio frequencies that are not stable due to interference with other radio systems are registered in a blacklist and the registered radio frequencies are not used (see Patent Document 1). In communication between wireless devices, there is a place where radio waves are strengthened or weakened due to superposition of radio waves such as direct waves, reflected waves, and transmitted waves. When a wireless device is installed in a place where radio waves are weak, communication is not stable even in a situation where no other wireless system exists. The place where the radio wave is weak differs depending on the radio frequency to be used and the installation state of the object that reflects the radio wave. The radio wave condition of the place where the wireless system is installed and the situation of the object being placed change over time, so it is advantageous to ensure the stability of communication if more radio frequencies can be used. It is. However, in the technique disclosed in Patent Document 1, the radio frequency once registered in the black list is not deleted from the black list even if the radio wave condition changes and becomes good. There is a problem that it decreases.

  Therefore, a technique has been proposed in which a radio frequency that has become available is deleted from the black list and can be used again (see Patent Document 2). In the technique disclosed in Patent Document 2, the power transmission efficiency is obtained for each radio frequency when power is transmitted from the power transmission device, and a radio frequency having a power transmission efficiency equal to or lower than a reference lower limit value is set as a non-use candidate parameter. A radio frequency having a predetermined number of times set as the non-use candidate parameter within a certain period is registered in the black list as a non-use parameter so that the radio frequency is not used. Even if the radio frequency is once registered in the blacklist, if the radio wave environment changes, there is a possibility that power can be transmitted and received again normally. Therefore, the technique disclosed in Patent Document 2 is used regularly or irregularly. Unused parameters or unused candidate parameters are canceled to increase the number of usable radio frequencies as much as possible.

JP 2005-513974 A JP 2012-175797 A

  In the technique disclosed in Patent Document 2, radio frequencies are deleted from the black list periodically or irregularly regardless of whether or not the radio wave environment is truly improved. Therefore, unusable radio frequencies are also deleted from the black list. There is a possibility of trying to communicate at a radio frequency that cannot be used. As a result, the technique disclosed in Patent Document 2 has problems in that it interferes with other wireless communication, communication delay occurs, and wasteful energy is consumed.

  The present invention has been made to solve the above-described problem, and in a radio frequency management apparatus and method for managing radio frequencies that cannot be used by a radio system by using an unusable frequency list, the available radio frequencies are efficiently used. The purpose is to increase well.

  The radio frequency management apparatus of the present invention includes an unusable frequency list storage unit that stores an unusable frequency list that is a list of radio frequencies that cannot be used in a radio system to be managed, and a radio frequency in the unusable frequency list. Unusable registration history storage means for storing the registered date and time and the date and time when the radio frequency is deleted from the unusable frequency list as history information, and history information stored in the unusable registration history storage means and preset. Based on a plurality of generation algorithms, a determination index value for extracting candidates for radio frequencies to be deleted from the unusable frequency list is generated for each radio frequency and generation algorithm registered in the unusable frequency list. Determination index value generation means and unusable state registered in the unusable frequency list Unusable registration deletion candidate extraction means for extracting a radio frequency whose determination index value satisfies a predetermined extraction condition from among radio frequencies as an unusable registration deletion candidate, and whether or not the unusable registration deletion candidate is usable. When it is determined that an unusable registration deletion candidate based on a determination index value calculated by a generation algorithm selected from an externally selected generation algorithm among the plurality of generation algorithms is determined to be usable An unusable registration deletion means for deleting the unusable registration deletion candidate from the unusable frequency list and updating the deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage means, and the unusable frequency Judgment finger based on which the radio frequency registered in the list is extracted as the unusable registration deletion candidate A radio frequency availability determination result history storage means for storing a value, identification information indicating a generation algorithm of the determination index value, and a determination result of availability of the unusable registration deletion candidate as history information, and this radio frequency availability determination Radio frequency availability determination result display for displaying the determination result and determination index value of the unusable registration deletion candidate for each determination index value generation algorithm based on the history information stored in the result history storage means Means.

Further, one configuration example of the radio frequency management device of the present invention further includes determination index value generation algorithm selection means for selecting any one of the plurality of generation algorithms according to an instruction from the outside, and the unusable registration The deleting means uses the unusable registration deletion candidate when the unusable registration deletion candidate based on the determination index value calculated by the generation algorithm selected by the determination index value generation algorithm selection means is determined to be usable. The deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage unit is updated while being deleted from the unusable frequency list.
In one configuration example of the radio frequency management device of the present invention, the radio frequency availability determination result history storage means includes the determination index value, identification information indicating a generation algorithm of the determination index value, and the unusable registration deletion candidate. In addition to the determination result on whether or not to use, the information on the date and time when the determination result was obtained is stored as history information, and the radio frequency availability determination result display means When the determination index value is displayed, information on the time or date and time when the determination result is obtained is also displayed.
Further, in one configuration example of the radio frequency management device of the present invention, the radio frequency availability determination result display means displays the determination result of the availability of the unusable registration deletion candidate and a determination index value. The identification information of the unusable registration deletion candidate is displayed together.
Further, in one configuration example of the radio frequency management device of the present invention, the radio frequency availability determination result display means displays the determination result of the availability of the unusable registration deletion candidate and a determination index value. The number of successes and the number of failures in determining whether or not the unusable registration deletion candidate can be used are displayed together.

  Further, the radio frequency management method of the present invention includes an unusable registration history storage unit that stores, as history information, a date and time when a radio frequency was registered in the unusable frequency list and a date and time when the radio frequency was deleted from the unusable frequency list. With reference to, based on the history information and a plurality of preset generation algorithms, a determination index value for extracting a candidate for a radio frequency to be deleted from the unusable frequency list is registered in the unusable frequency list. A determination index value generation step that is generated for each radio frequency and each generation algorithm, and a radio in which the determination index value satisfies a predetermined extraction condition among unusable radio frequencies registered in the unusable frequency list Unusable registration deletion candidate extraction step for extracting frequencies as unusable registration deletion candidates, and the unusable registration An unusable registration deletion candidate based on a determination index value calculated by a generation algorithm selected from the outside among the plurality of generation algorithms is used. When it is determined that it is possible to use, this unusable registration deletion candidate is deleted from the unusable frequency list and the deletion date / time of the unusable registration deletion candidate stored in the unusable registration history storage unit is updated. An unusable registration deletion step, a determination index value based on which a radio frequency registered in the unusable frequency list is extracted as the unusable registration deletion candidate, identification information indicating a generation algorithm of the determination index value, and the use Use of radio frequency availability judgment result as history information with judgment result of availability of unusable registration deletion candidate Based on the history information stored in the radio frequency availability determination result history storage means to be stored in the storage means, the determination result on availability of the unusable registration deletion candidate, And a radio frequency availability determination result display step for displaying the determination index value for each generation algorithm of the determination index value.

  According to the present invention, the determination index value is calculated for each unusable radio frequency registered in the unusable frequency list, and the radio frequency that is likely to be usable is determined based on the determination index value. Is extracted as an unusable registration deletion candidate, it is checked whether the unusable registration deletion candidate is actually usable, and the unusable registration deletion candidate that has become usable is deleted from the unusable frequency list. Therefore, it is possible to reduce the possibility of attempting communication at an unusable radio frequency, reduce communication delay and wasteful energy consumption, and efficiently increase the usable radio frequency. Further, in the present invention, a plurality of determination index value generation algorithms are set in advance, and determination index values are generated for each radio frequency and generation algorithm registered in the unusable frequency list, and the unusable registration deletion candidate can be used. The determination result and the determination index value are displayed according to the generation algorithm of the determination index value, so that the material for determining whether the generation algorithm of the determination index value currently selected by the operator is appropriate is used. Can be provided.

  Further, in the present invention, when displaying the determination result of the availability of the unusable registration deletion candidate and the determination index value, by displaying the information on the time or date and time when the determination result is obtained, for example, a specific time When a judgment result that is significantly different from other time periods is detected, it is a clue to examine whether an event affecting the judgment result has occurred at that particular time, and the judgment index that the operator is currently selected Materials can be provided in determining whether a value generation algorithm is valid.

  Further, in the present invention, when displaying the determination result of the availability of the unusable registration deletion candidate and the determination index value, the operator can delete the unusable registration by displaying the identification information of the unusable registration deletion candidate together. It is possible to know for each radio frequency whether the determination result of candidate availability and the determination index value match, and the operator can determine whether the generation algorithm for the currently selected determination index value is valid. Materials can be provided.

  Further, in the present invention, when displaying the determination result and determination index value of the unusable registration deletion candidate, the number of successes and the number of failures in determining the unusable registration deletion candidate can be displayed together. Thus, the operator can grasp whether or not the determination result of whether or not the unusable registration deletion candidate is usable matches the determination index value, and the generation algorithm of the determination index value currently selected by the operator is valid. It is possible to provide materials for determining whether or not.

It is a block diagram which shows the structure of the radio frequency management apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the log | history information memorize | stored in the unusable registration log | history memory | storage part in the 1st Embodiment of this invention. It is a flowchart explaining the unusable registration deletion process of the 1st Embodiment of this invention. It is a figure which shows the log | history information memorize | stored in the unusable registration log | history memory part after the unusable registration deletion process completion. It is a figure which shows an example of the log | history information memorize | stored in the radio frequency availability determination result log | history memory | storage part in the 1st Embodiment of this invention. It is a figure which shows the example of a display by the radio frequency availability determination result display part of the 1st Embodiment of this invention. It is a figure which shows the example of a display by the radio frequency availability determination result display part of the 2nd Embodiment of this invention. It is a figure which shows the example of a display by the radio frequency availability determination result display part of the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a radio frequency management apparatus according to the first embodiment of the present invention. The radio frequency management apparatus includes an unusable frequency list storage unit 1 that stores an unusable frequency list that is a list of radio frequencies that cannot be used in a radio system (not shown) to be managed, and a radio frequency that is unusable frequency list. An unusable registration history storage unit 2 that stores, as history information, the date and time when the radio frequency was deleted from the unusable frequency list, and the radio frequency that could not be used in the radio system to be managed An unusable frequency list registering unit 3 for registering in the list and adding the date and time of registration of the radio frequency to the unusable frequency list to the history information stored in the unusable registration history storing unit 2, and unusable registration history storage Based on the history information stored in the unit 2 and a plurality of preset generation algorithms. A determination index value generation unit 4 for generating a determination index value for extracting a candidate for a radio frequency to be deleted from the wireless frequency for each wireless frequency and generation algorithm registered in the unusable frequency list, and registration in the unusable frequency list An unusable registration deletion candidate extraction unit 5 that extracts, as unusable registration deletion candidates, radio frequencies whose determination index value satisfies a predetermined extraction condition from among the unusable radio frequencies that are used, and an unusable registration deletion candidate Unusable based on a determination index value calculated by a generation algorithm selected by a radio frequency availability determination unit 6 that determines whether or not it can be used, and a determination index value generation algorithm selection unit 11 described later among a plurality of generation algorithms When it is determined that the registration deletion candidate is usable, the unusable registration deletion candidate is deleted from the unusable frequency list. In addition, when it is determined that the unusable registration deletion candidate 7 that updates the deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage unit 2 and the unusable registration deletion candidate is unusable. The demotion mark adding unit 8 for adding a demotion mark to the history information of the unusable registration deletion candidate stored in the unusable registration history storage unit 2 and the radio frequency registered in the unusable frequency list are unusable registered. The history information includes the determination index value that is the basis for extraction as a deletion candidate, identification information indicating the generation algorithm of this determination index value, the determination result of whether or not the unusable registration deletion candidate can be used, and the information on the date and time when the determination result was obtained. Unusable registration deletion based on the history information stored in the stored radio frequency availability determination result history storage unit 9 and the radio frequency availability determination result history storage unit 9 The radio frequency usability determination result display unit 10 that displays the determination result of the availability of candidates and the determination index value for each determination index value generation algorithm, and any of a plurality of generation algorithms for determination index values according to an instruction from the outside And a determination index value generation algorithm selection unit 11 for selecting one of them.

  The unusable frequency list registration unit 3 registers a radio frequency that cannot be used in the radio system to be managed in the unusable frequency list stored in the unusable frequency list storage unit 1 and uses the radio frequency. The date and time of registration in the unusable frequency list is added to the history information of the radio frequency stored in the unusable registration history storage unit 2. The unusable frequency list registration unit 3 performs such registration processing as needed according to the radio frequency unusable information from the radio system.

  When a certain radio frequency is registered in the unavailable frequency list, the radio system does not use the radio frequency until the registration is deleted. Here, the determination of whether or not a certain radio frequency can be used depends on the radio system. For example, when there is no response from the other party when information is transmitted using the radio frequency, or the radio frequency is determined. When the used communication error rate is equal to or higher than a predetermined threshold, it is determined that this radio frequency cannot be used.

  FIG. 2 is a diagram illustrating an example of history information stored in the unusable registration history storage unit 2. In the example of FIG. 2, the radio frequency is represented by a channel number. According to the history information shown in FIG. 2, the radio frequency of channel number 17 is registered in the unusable frequency list at 12:01:15 on October 1, 2012, and at 15: 3 on October 1, 2012. It is deleted from the unusable frequency list at the time of 56 minutes and is registered in the unusable frequency list at 15: 5: 30 on November 1, 2012, and it is 18:05:55 on November 1, 2012 It can be seen that it was deleted from the unusable frequency list at the time of second, and further registered in the unusable frequency list at 11:07:20 on December 1, 2012.

  For radio frequencies in an unusable state registered in the unusable frequency list, the deletion date information is an unrealistic value (23:59:59 on December 31, 2099 in the example of FIG. 2). Is set. Therefore, according to the latest history information, for example, the radio frequency of channel number 17 is registered in the unusable frequency list at 11:07:20 on December 1, 2012, and then from the unusable frequency list. You can see that it has not been deleted. The demotion mark in FIG. 2 will be described later.

  When the radio frequency registered in the unusable frequency list increases, the usable radio frequency decreases. Therefore, there is a possibility that the radio frequency can be used based on the history information stored in the unusable registration history storage unit 2. It is determined whether or not a radio frequency having a high frequency can be deleted from the unavailable frequency list. FIG. 3 is a flowchart for explaining the unusable registration deletion processing according to this embodiment.

  The determination index value generation unit 4 is a deletion process timing that is defined in advance so that the radio frequency registered in the unusable frequency list increases and the usable radio frequency becomes a predetermined number or less, or is executed at regular intervals. In this case, based on the history information stored in the unusable registration history storage unit 2, a determination index value for extracting a candidate for a radio frequency to be deleted from the unusable frequency list is generated (step S1 in FIG. 3). ).

  In the present embodiment, a plurality of generation algorithms are set in advance as the determination index value generation algorithm, and the determination index value generation unit 4 calculates the determination index value using the unusable frequency registered in the unusable frequency list. This is performed for each possible radio frequency and each generation algorithm. Hereinafter, three generation algorithms for determination index values will be described.

[First generation algorithm]
The first generation algorithm assumes a case where a radio frequency is accidentally registered in the unusable frequency list at a certain time. In such a case, for example, due to the influence of an object temporarily placed on the communication path, radio waves are weakened between fixedly installed wireless devices, and the used radio frequency is an unusable frequency list. However, there is a case where the situation where the radio wave is weakened between the wireless devices is resolved because the object has moved.

In order to cope with such a case, in the first generation algorithm, the period from the past to the current time before a certain time is set as the specified period RT (for example, the most recent day), and the radio frequency cannot be used in the specified period RT. The unusable rate FT / RT, which is the ratio of the unusable cumulative time FT, is calculated, and the usable rate V1 [%] calculated from the unusable rate FT / RT is used as the determination index value. That is, the usable rate V1 is a ratio of the usable accumulated time ST in which the radio frequency is usable during the specified period RT.
V1 = (1-FT / RT) × 100 = ST / RT × 100 (1)

  By referring to the history information stored in the unusable registration history storage unit 2, it is possible to recognize the date and time when the radio frequency was usable and the date and time when the radio frequency was unavailable. 4 can determine the unusable cumulative time FT in which the radio frequency is unusable during the specified period RT, and can calculate the determination index value V1. The determination index value generation unit 4 calculates the determination index value V1 according to the first generation algorithm as described above for each radio frequency in the unusable state registered in the unusable frequency list.

[Second generation algorithm]
Next, the second generation algorithm will be described. In the second generation algorithm, when the radio frequency has changed for a longer period of time since it was registered in the unusable frequency list, the radio wave environment has changed, and it is likely that the radio frequency environment can now be used. Is assumed. In such a case, for example, due to the influence of an object temporarily placed on the communication path, radio waves are weakened between fixedly installed wireless devices, and the used radio frequency is an unusable frequency list. However, there is a case where the situation where the radio wave is weakened between the wireless devices is resolved because the object has moved.

In order to cope with such a case, in the second generation algorithm, determination is made as follows based on the unusable duration CT, which is the time from the latest date and time registered in the unusable frequency list to the present. An index value V2 [%] is calculated.
V2 = CT / CTmax × 100 (2)

  CTmax in Equation (2) is a maximum unusable duration that is a preset eigenvalue. By referring to the history information stored in the unusable registration history storage unit 2, the latest date and time when the radio frequency is registered in the unusable frequency list can be acquired. For example, in the example of FIG. 2, it can be seen that the latest date and time when the radio frequency of channel number 17 is registered in the unusable frequency list is 11:07:20 on December 1, 2012. The unusable duration CT can be obtained based on the latest date and time. The current number of failures F can be obtained from the history information stored in the radio frequency availability determination result history storage unit 9, and the radio frequency availability determination result history storage unit 9 will be described later.

  Equation (2) is a calculation method of the determination index value V2 when CTmax ≧ CT, that is, the current unusable duration time is equal to or less than the maximum unusable duration time CTmax, and CTmax <CT, that is, the current unusable state. When the duration CT is longer than the maximum unusable duration CTmax, the determination index value V2 is set to zero. The determination index value generation unit 4 calculates the determination index value V2 according to the second generation algorithm as described above for each radio frequency in the unusable state registered in the unusable frequency list.

  In the present embodiment, candidates for radio frequencies to be deleted from the unusable frequency list are extracted based on the determination index value. In the second generation algorithm, if the determination result becomes unusable when it is determined whether or not the radio frequency is usable, the unusable state is maintained, and the wireless frequency determination index value V2 is not used when it is next calculated. The determination index value V2 increases by an amount corresponding to the increase in duration. Therefore, when trying to extract a candidate for a radio frequency to be deleted from the unusable frequency list, it is difficult to select a radio frequency with a short unusable duration, that is, a low possibility that the radio wave environment is changing as a candidate. Can reduce unnecessary trials. In the second generation algorithm, by providing a threshold value of the maximum unusable duration CTmax, the determination index value V2 is set to 0 for a radio frequency in which the unusable state continues regardless of the passage of time. By doing so, it can be prevented from becoming an unusable registration deletion candidate.

[Third generation algorithm]
Next, the third generation algorithm will be described. The third generation algorithm assumes that the radio wave environment has a pattern depending on the time zone. In such a case, for example, in an environment where a wireless system to be managed coexists with a wireless LAN (Local Area Network), the wireless frequency used in the wireless LAN is not used because the wireless LAN is frequently used in the daytime. There is a possibility that the possibility of the wireless frequency becomes high and the possibility that the wireless frequency becomes unusable becomes low because the use of the wireless LAN is reduced at night.

In order to cope with such a case, in the third generation algorithm, the predetermined period (number of days) in the past is set as the specified period PD, and the radio frequency cannot be used in the predetermined time zone WT in the past specified period PD. The unusable rate MD / PD that is the ratio of the cumulative number of times (cumulative days) MD is calculated, and the usable rate V3 [%] calculated from the unusable rate MD / PD is used as the determination index value. In other words, the availability rate V3 is a ratio of the cumulative number of times (cumulative days) LD in which the radio frequency is usable in the predetermined time period WT in the designated period PD.
V3 = (1-MD / PD) × 100 = LD / PD × 100 (3)

  By referring to the history information stored in the unusable registration history storage unit 2, it is possible to recognize the date and time when the radio frequency was usable and the date and time when the radio frequency was unavailable. 4 can determine the cumulative number of times (cumulative days) MD in which the radio frequency has become unusable in the predetermined time zone WT in the past designated period PD, and can calculate the determination index value V3. Here, the predetermined time zone WT may be a time zone in which the radio frequency is desired to be used. The determination index value generation unit 4 calculates the determination index value V3 according to the third generation algorithm as described above for each radio frequency in the unusable state registered in the unusable frequency list. Thus, in this embodiment, the determination index value is calculated for each of the three generation algorithms.

  Next, the unusable registration deletion candidate extraction unit 5 includes radio frequencies whose determination index values V1, V2, and V3 satisfy a predetermined extraction condition among unusable radio frequencies registered in the unusable frequency list. Is determined for each unusable radio frequency and each generation algorithm (step S2 in FIG. 3). The unusable registration deletion candidate extraction unit 5 sets this radio frequency as an unusable registration deletion candidate when there are radio frequencies whose determination index values V1, V2, and V3 satisfy a predetermined extraction condition (YES in step S2). (FIG. 3, step S3). Here, as an extraction condition corresponding to the determination index values V1, V2, and V3, a condition that the determination index values V1, V2, and V3 are equal to or greater than a predetermined threshold (for example, 50%) is predetermined. To do. The extraction condition may be set for each generation algorithm or may be different for each generation algorithm.

  Next, the radio frequency availability determination unit 6 can actually use the radio frequency that is most likely to be usable among the unusable registration deletion candidates extracted by the unusable registration deletion candidate extraction unit 5. The wireless system to be managed is inquired as to whether it has become (step S4 in FIG. 3). Here, the radio frequency with the largest determination index value V1, V2, V3 among the unusable registration deletion candidates is set as the radio frequency with the highest possibility of being usable.

  In response to the inquiry from the radio frequency availability determination unit 6, the radio system performs a test to check whether the radio frequency is usable, and determines the radio frequency availability determination result as the radio frequency availability determination unit 6. Notify A radio system can use this radio frequency when, for example, there is a response from the other party when information is transmitted using the radio frequency, or when the error rate of communication using the radio frequency is less than a predetermined threshold. It is determined that The radio frequency availability determination unit 6 notifies the unusable registration deletion unit 7 and the demote mark addition unit 8 of the determination result of radio frequency availability received from the radio system.

  When the unusable registration deletion unit 7 receives a notification that the radio frequency can be used from the radio frequency usability determination unit 6 (YES in step S4), the usable radio frequency is selected as a determination index value generation algorithm. If it is an unusable registration deletion candidate based on the determination index value calculated by the generation algorithm currently selected by the unit 11 (YES in step S5 in FIG. 3), the usable radio frequency is displayed as the unusable frequency list. While deleting from the unusable frequency list memorize | stored in the memory | storage part 1, the deletion date of the said radio frequency memorize | stored in the unusable registration log | history memory part 2 is updated to the present date (step S6 of FIG. 3). The operation of the determination index value generation algorithm selection unit 11 will be described later.

  When receiving the determination result of whether or not the radio frequency can be used from the radio system, the radio frequency availability determination unit 6 extracts a determination index value that is a basis for extracting the radio frequency as an unusable registration deletion candidate and the determination index value. The radio frequency history stored in the radio frequency availability determination result history storage unit 9 is the identification information indicating the generation algorithm, the determination result of the availability of the radio frequency, and the information on the date and time when the determination result of the availability is obtained. The information is added (step S7 in FIG. 3).

  For example, the generation algorithm currently selected by the determination index value generation algorithm selection unit 11 is the first generation algorithm, and the radio frequency determined to be usable by the radio system is the radio frequency of channel number 17 in FIG. When the radio frequency of channel number 17 is an unusable registration deletion candidate extracted based on the determination index value V1 calculated by the first generation algorithm, identification information indicating the determination index value V1 and the first generation algorithm And the determination result of the availability of the radio frequency (here, “success” indicating availability) and the date and time information on which the determination result of the availability was obtained are registered as history information of the radio frequency.

  In addition, the radio frequency availability determination unit 6 is a determination index calculated by a generation algorithm that is different from the generation algorithm in which the radio frequency determined to be usable by the radio system is currently selected by the determination index value generation algorithm selection unit 11. If it is an unusable registration deletion candidate based on the value (NO in step S5), identification information indicating a determination index value that is a basis for extracting this radio frequency as an unusable registration deletion candidate and an algorithm for generating this determination index value And the information on the date and time when the determination result of the availability of the radio frequency and the determination result of the availability are obtained are added to the history information of the radio frequency stored in the radio frequency availability determination result history storage unit 9 (step S7). ).

  For example, the generation algorithm currently selected by the determination index value generation algorithm selection unit 11 is the first generation algorithm, and the radio frequency determined to be usable by the radio system is the radio frequency of channel number 18 in FIG. When the radio frequency of channel number 18 is an unusable registration deletion candidate extracted based on the determination index value V2 calculated by the second generation algorithm, identification information indicating the determination index value V2 and the second generation algorithm And the determination result of the availability of the radio frequency (here, “success” indicating availability) and the date and time information on which the determination result of the availability was obtained are registered as history information of the radio frequency.

  On the other hand, when receiving the notification that the radio frequency cannot be used from the radio frequency availability determination unit 6 (NO in step S4), the demotion mark adding unit 8 uses the radio frequency in the unusable state as the unusable frequency list. The demotion mark is added to the latest history information of the radio frequency stored in the unusable registration history storage unit 2 (step S8 in FIG. 3). This demotion mark is used to lower the selection order of radio frequencies when extracting unusable registration deletion candidates.

  Then, the radio frequency availability determination unit 6 determines the determination index value based on which the radio frequency is extracted as the unusable registration deletion candidate, the identification information indicating the generation algorithm of the determination index value, and the determination of the availability of the radio frequency. The information on the date and time when the result and the determination result of availability are obtained are added to the history information of the radio frequency stored in the radio frequency availability determination result history storage unit 9 (step S7).

  For example, the radio frequency determined to be unusable by the radio system is the radio frequency of the channel number 21 in FIG. 2, and the radio frequency of the channel number 21 is based on the determination index value V3 calculated by the third generation algorithm. In the case of the extracted unusable registration deletion candidate, the determination index value V3, the identification information indicating the third generation algorithm, the determination result of the availability of the radio frequency (here, “failure” indicating unusable), and the availability And the date and time information on which the determination result is obtained are registered as history information of the radio frequency.

  The radio frequency management apparatus performs the processing in steps S2 to S8 as described above for each of the unusable registration deletion candidates in the descending order of the determination index values V1, V2, and V3, that is, in descending order of selection order. Among the registered unusable radio frequencies, there are no unprocessed radio frequencies whose determination index values V1, V2, and V3 satisfy a predetermined extraction condition, and there are no unprocessed unusable registration deletion candidates. At that time (NO in step S2), the unusable registration deletion process is terminated.

  As described above, in this embodiment, since three generation algorithms are preset as generation algorithms for determination index values, steps S2 to S5, S7, and S8 are executed for all generation algorithms. On the other hand, regarding the process of step S6 for deleting the usable radio frequency from the unusable frequency list, the use is not possible based on the determination index value calculated by the generation algorithm selected by the determination index value generation algorithm selection unit 11. It is executed only for registration deletion candidates.

  FIG. 4 shows history information stored in the unusable registration history storage unit 2 after the unusable registration deletion process is completed. In the example of FIG. 4, the date and time when the radio frequency of channel number 17 was deleted from the unusable frequency list (in the example of FIG. 4, 12: 00: 5 on December 1, 2012) is the radio of channel number 17. It is recorded in the latest history information of frequency. Also, a demote mark is added to the latest history information of the radio frequency of channel number 21. In the example of FIG. 4, “o” marks indicate that a demotion mark is added.

  When the determination index value generation unit 4 calculates the determination index value in the next unusable registration deletion process, the latest latest history information corresponding to the unusable radio frequencies registered in the unusable frequency list. For the radio frequency to which the demotion mark is added, the determination index value is calculated so that the selection order of the radio frequency is lowered. Specifically, the determination index value generation unit 4 may subtract a predetermined value (for example, 20%) from the calculated determination index values V1, V2, and V3. As a result, the determination index values V1, V2, and V3 are reduced and the selection order is lowered. Therefore, the radio frequency determined to be unusable in the current unusable registration deletion process is unusable registration deleted in the next unusable registration deletion process. It can be made difficult to be selected as a candidate.

Next, the radio frequency availability determination result history storage unit 9, the radio frequency availability determination result display unit 10, and the determination index value generation algorithm selection unit 11 will be described.
As described above, in the unusable registration deletion process, when the wireless frequency availability determination unit 6 receives the determination result of the wireless frequency availability from the wireless system, the wireless frequency availability determination unit 6 extracts the wireless frequency as an unusable registration deletion candidate. The determination index value that has become, the identification information indicating the generation algorithm of the determination index value, the determination result of the availability of the radio frequency, and the information of the date and time when the determination result of the availability is obtained, the radio frequency availability determination result history storage unit 9 is added to the history information of the radio frequency stored in 9 (step S7 in FIG. 3).

  FIG. 5 is a diagram showing an example of history information stored in the radio frequency availability determination result history storage unit 9. In the example of FIG. 5, the radio frequency is represented by a channel number (identification information). Thus, the history information is stored in association with the identification information of the radio frequency.

  The number of failures F used in the second generation algorithm of the determination index value is based on the history information stored in the radio frequency usability determination result history storage unit 9 and the history information stored in the unusable registration history storage unit 2. Can be requested. Specifically, the determination index value generation unit 4 obtains the latest date and time when the radio frequency for which the determination index value is to be calculated is registered in the unusable frequency list from the history information in the unusable registration history storage unit 2, Count the number of times F that the determination result of failure (unusable) was obtained in the determination of availability of the radio frequency performed after the latest date and time based on the history information in the radio frequency availability determination result history storage unit 9. do it.

  Next, the radio frequency availability determination result display unit 10 uses the radio frequency when there is a display request from the operator of the radio frequency management device or when the display timing is determined in advance to be executed at regular intervals. Based on the history information stored in the availability determination result history storage unit 9, the determination result of the availability of the radio frequency and the determination index value are displayed for each determination index value generation algorithm.

  6A to 6C are diagrams showing examples of display by the radio frequency availability determination result display unit 10, and FIG. 6A shows the determination index value V1 calculated by the first generation algorithm. FIG. 6B is a diagram illustrating a determination result of whether or not the radio frequency extracted based on the determination result is obtained. FIG. 6B is a determination result of whether or not the radio frequency extracted based on the determination index value V2 calculated by the second generation algorithm is used. FIG. 6C is a diagram showing a determination result of availability of the radio frequency extracted based on the determination index value V3 calculated by the third generation algorithm.

  6A to 6C, the vertical axis represents the channel number of the radio frequency, and the horizontal axis represents the time when the determination result of the availability of the radio frequency is obtained. A white circle symbol indicates success (can be used), and a gray circle symbol indicates failure (cannot be used). The numerical value described in the symbol is the determination index value [%]. The symbol size indicates the size of the determination index value. 6A to 6C may be displayed simultaneously in one window, or FIGS. 6A to 6C may be displayed in separate windows.

  According to FIG. 6A, the determination index value of the radio frequency of channel number 15 at time t1 is as high as 80 [%], and the determination result of availability is “success”. Therefore, it can be determined that the first generation algorithm that has generated this determination index value is appropriate for the radio frequency of channel number 15 and the time zone of time t1. Further, the determination index value of the radio frequency of channel number 11 at time t2 is as low as 60 [%], and the determination result of availability is “failure”. Therefore, it can be determined that the first generation algorithm that generated this determination index value is appropriate for the radio frequency of channel number 11 and the time zone of time t2. Further, the determination index value of the radio frequency of channel number 5 at time t3 is as high as 70 [%], but the determination result of availability is “failure”. Therefore, it can be determined that the first generation algorithm that generated this determination index value is not valid with respect to the radio frequency of channel number 5 and the time zone at time t3.

  In this way, the validity of the determination index value generation algorithm can be determined by expressing the determination result of the availability of the radio frequency and the determination index value by one symbol and displaying them in time series. . Further, according to the display method of the present embodiment, the validity of the generation algorithm for each time zone can also be determined. For example, when a determination result that is significantly different from other time zones is detected at a specific time, it is a clue to examine whether an event that affects the determination result has occurred at that specific time. A material for determining whether or not the generation algorithm of the determination index value currently selected by the generation algorithm selection unit 11 is appropriate can be provided.

  The operator who has seen the display on the radio frequency availability determination result display unit 10 determines whether the determination index value generation algorithm currently selected by the determination index value generation algorithm selection unit 11 is valid. If it is determined that there is not, an instruction to change the selection of the generation algorithm is given to the determination index value generation algorithm selection unit 11.

  The determination index value generation algorithm selection unit 11 selects any one of the three generation algorithms in accordance with an operator instruction. The determination index value generation algorithm selection unit 11 may select the generation algorithm for the determination index value as common to all radio frequencies and all time zones, or select a generation algorithm that differs depending on the radio frequency. Alternatively, different generation algorithms may be selected depending on the time zone. The operator can specify what kind of selection to make.

  As described above, in the present embodiment, a determination index value is calculated for each unusable radio frequency registered in the unusable frequency list, and can be used based on the determination index value. Radio frequencies that are highly likely to be extracted as unusable registration deletion candidates, check whether the unusable registration deletion candidates are actually usable, and select the unusable registration deletion candidates that have become usable from the unusable frequency list Since deletion is performed, the possibility of attempting communication at an unusable radio frequency can be reduced, communication delay and useless energy consumption can be reduced, and the usable radio frequency can be efficiently increased.

  In the present embodiment, the determination index value generation algorithm selection unit 11 allows the operator to display the determination result as to whether or not the unusable registration deletion candidate is actually usable for all algorithms of the determination index value. This makes it easy to determine whether or not the currently selected determination index value generation algorithm is valid. As a result, it is possible to cause the determination index value generation algorithm selection unit 11 to select an appropriate generation algorithm.

  In addition, it is highly likely that the radio frequency determined as unusable in the unusable registration deletion process is unusable in the next unusable registration deletion process. In this embodiment, a demote mark is added to the history information of the radio frequency determined to be unusable in the unusable registration deletion process, so that it is difficult to be selected as an unusable registration deletion candidate in the next unusable registration deletion process. The usable radio frequency can be increased efficiently.

  In this embodiment, the condition that the determination index value is equal to or greater than a predetermined threshold is used as the extraction condition for the unusable registration deletion candidate. However, the present invention is not limited to this, and the selection index indicated by the determination index value is counted from the higher one. The condition that the number of radio frequencies is the specified number may be used as the extraction condition. Note that the horizontal axis in FIGS. 6A to 6C may be the date and time when the determination result is obtained, instead of the time when the determination result of the availability of the radio frequency is obtained.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Also in the present embodiment, the configuration of the radio frequency management device and the flow of processing of the radio frequency management device are the same as those in the first embodiment, and therefore description will be made using the reference numerals in FIG. In the present embodiment, another display method by the radio frequency availability determination result display unit 10 will be described. Other configurations are the same as those described in the first embodiment.

  FIG. 7A to FIG. 7C are diagrams showing display examples by the radio frequency availability determination result display unit 10 of the present embodiment, and FIG. 7A is calculated by the first generation algorithm. FIG. 7B is a diagram showing the determination result of the availability of the radio frequency extracted based on the determination index value V1, and FIG. 7B shows the radio frequency extracted based on the determination index value V2 calculated by the second generation algorithm. FIG. 7C is a diagram showing the determination result of the availability of the radio frequency, and FIG. 7C is a diagram showing the determination result of the availability of the radio frequency extracted based on the determination index value V3 calculated by the third generation algorithm.

  In FIGS. 7A to 7C, the number of successes (frequency) at which a determination result “success (usable)” is obtained on the vertical axis and the number of failures (frequency) at which a judgment result “failure (unusable)” is obtained. ), And the horizontal axis is the determination index value. As for the vertical axis, the number of successes is shown above 0 times, and the number of failures is shown below 0 times. A white square symbol indicates success, a gray square symbol indicates failure, and one symbol indicates one success or one failure. For the horizontal axis, the determination index value is in increments of 10. For example, the radio frequency success count and failure count extracted based on the determination index value 65 [%] are expressed by symbols corresponding to the determination index values 60 to 69 [%].

  The history information as shown in FIG. 5 is stored in the radio frequency availability determination result history storage unit 9. Therefore, the radio frequency availability determination result display unit 10 can obtain the number of successes and the number of failures by counting the success / failure of the availability determination for each determination index value and for each generation algorithm of the determination index value. The failure frequency F used in the second generation algorithm of the determination index value is obtained as a result of determination of failure in determining whether or not the radio frequency can be used after the latest date and time when the radio frequency is registered in the unusable frequency list. 7A to 7C, the number of failures displayed in FIG. 7A to FIG. 7C is different from the number of failures F, from the past stored in the radio frequency usability determination result history storage unit 9 to the present. All the determination results up to are targeted. 7A to 7C may be displayed simultaneously in one window, or FIGS. 7A to 7C may be displayed in separate windows.

  According to the present embodiment, by displaying the number of successes and the number of failures in determining whether or not the unusable registration deletion candidate is actually usable, by displaying the determination index value by category for all algorithms of the determination index value, The operator can grasp whether the determination result of whether or not the radio frequency is usable matches the determination index value, and the generation algorithm of the determination index value currently selected by the operator in the determination index value generation algorithm selection unit 11 The material for determining whether or not is appropriate can be provided.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. Also in the present embodiment, the configuration of the radio frequency management device and the flow of processing of the radio frequency management device are the same as those in the first embodiment, and therefore description will be made using the reference numerals in FIG. In the present embodiment, another display method by the radio frequency availability determination result display unit 10 will be described. Other configurations are the same as those described in the first embodiment.

  FIG. 8A to FIG. 8C are diagrams showing display examples by the radio frequency availability determination result display unit 10 of the present embodiment, and FIG. 8A is calculated by the first generation algorithm. FIG. 8B is a diagram illustrating a determination result of whether or not the radio frequency extracted based on the determination index value V1 is usable; FIG. 8B illustrates the radio frequency extracted based on the determination index value V2 calculated by the second generation algorithm. FIG. 8C is a diagram showing a result of determining whether or not the radio frequency is usable, and FIG. 8C is a diagram illustrating a result of determining whether or not the radio frequency is extracted based on the determination index value V3 calculated by the third generation algorithm.

  In FIG. 8A to FIG. 8C, the vertical axis represents the number of successes (frequency) at which the determination result “success (usable)” and the number of failures (frequency) at which the determination result “failure (unusable)” was obtained. ) And the horizontal axis is the radio frequency channel number. As for the vertical axis, the number of successes is shown above 0 times, and the number of failures is shown below 0 times. A white square symbol indicates success, a gray square symbol indicates failure, and one symbol indicates one success or one failure. The numerical value described in the symbol is the determination index value [%].

  The history information as shown in FIG. 5 is stored in the radio frequency availability determination result history storage unit 9. Accordingly, the radio frequency availability determination result display unit 10 can count the number of successes and the number of failures by counting the success / failure of the availability determination for each radio frequency (unusable registration deletion candidate) and for each generation algorithm of the determination index value. Can be obtained. The number of failures here is different from the number of failures F used in the second generation algorithm of the determination index value, and all the determination results from the past to the present stored in the radio frequency usability determination result history storage unit 9 are obtained. It becomes a target. 8A to 8C may be simultaneously displayed in one window, or FIGS. 8A to 8C may be displayed in separate windows.

According to the present embodiment, by displaying the number of successes and the number of failures in determining whether or not the unusable registration deletion candidate has actually become usable for each algorithm of the determination index value, the operator can wirelessly Whether the determination result of whether or not the frequency is usable matches the determination index value can be grasped for each radio frequency, and the operator generates the determination index value currently selected by the determination index value generation algorithm selection unit 11. Materials can be provided in determining whether the algorithm is valid.
8A to 8C, the channel number is the identification information of the radio frequency (unusable registration deletion candidate), but the frequency value itself may be displayed as the identification information of the radio frequency.

  The determination index value generation algorithms described in the first to third embodiments are only examples. As long as a radio frequency that is highly likely to be usable can be extracted, the generation algorithm of the determination index value is not limited to that described in the first to third embodiments.

  The radio frequency management apparatus described in the first to third embodiments can be realized by a computer having a CPU (Central Processing Unit), a storage device, and an interface, and a program for controlling these hardware resources. . The CPU executes the processes described in the first to third embodiments in accordance with a program stored in the storage device.

  The present invention can be applied to a wireless system such as a wireless field device used in a plant or a wireless sensor system used in a building.

  DESCRIPTION OF SYMBOLS 1 ... Unusable frequency list memory | storage part, 2 ... Unusable registration history memory | storage part, 3 ... Unusable frequency list registration part, 4 ... Judgment index value generation part, 5 ... Unusable registration deletion candidate extraction part, 6 ... Radio frequency use Availability determination unit, 7 ... Unusable registration deletion unit, 8 ... Demotion mark addition unit, 9 ... Radio frequency availability determination result history storage unit, 10 ... Radio frequency availability determination result display unit, 11 ... Determination index value generation algorithm selection Department.

Claims (7)

Unusable frequency list storage means for storing an unusable frequency list that is a list of radio frequencies that could not be used in the wireless system to be managed;
Unusable registration history storage means for storing, as history information, the date and time when the radio frequency was registered in the unusable frequency list and the date and time when the radio frequency was deleted from the unusable frequency list;
Based on history information stored in the unusable registration history storage means and a plurality of preset generation algorithms, a determination index value for extracting a candidate for a radio frequency to be deleted from the unusable frequency list, Determination index value generating means for generating each radio frequency and generation algorithm registered in the unusable frequency list;
Unusable registration deletion candidate extraction means for extracting, as unusable registration deletion candidates, radio frequencies for which the determination index value satisfies a predetermined extraction condition among unusable radio frequencies registered in the unusable frequency list; ,
Radio frequency availability determination means for determining whether or not the unusable registration deletion candidate is usable;
When it is determined that an unusable registration deletion candidate based on a determination index value calculated by a generation algorithm selected from the outside among the plurality of generation algorithms is usable, the unusable registration deletion candidate is added to the unusable frequency list. And unusable registration deletion means for updating the deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage means,
Determination index value based on which a radio frequency registered in the unusable frequency list is extracted as the unusable registration deletion candidate, identification information indicating a generation algorithm of the determination index value, and use of the unusable registration deletion candidate Radio frequency availability determination result history storage means for storing the determination result of availability as history information;
Based on the history information stored in the radio frequency usability judgment result history storage means, a radio for displaying the judgment result and judgment index value of the unusable registration deletion candidate for each judgment index value generation algorithm A radio frequency management apparatus comprising: a frequency availability determination result display unit. The radio frequency management device according to claim 1,
Furthermore, it comprises a determination index value generation algorithm selection means for selecting any one of the plurality of generation algorithms according to an instruction from the outside,
The unusable registration deletion unit is configured to delete the unusable registration when the unusable registration deletion candidate based on the determination index value calculated by the generation algorithm selected by the determination index value generation algorithm selection unit is determined to be usable. A radio frequency management apparatus characterized by deleting a candidate from the unusable frequency list and updating a deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage unit. In the radio frequency management device according to claim 1 or 2,
The radio frequency availability determination result history storage means obtains the determination result in addition to the determination index value, identification information indicating the generation algorithm of the determination index value, and the determination result of the unusable registration deletion candidate. Store the date and time information as history information,
The radio frequency availability determination result display means displays the information on the time or date when the determination result is obtained when displaying the determination result of the availability of the unusable registration deletion candidate and the determination index value. A radio frequency management device. In the radio frequency management device according to claim 1 or 2,
The radio frequency availability determination result display means displays the identification information of the unusable registration deletion candidate together when displaying the determination result of the unusable registration deletion candidate availability and the determination index value. A characteristic radio frequency management device. In the radio frequency management device according to any one of claims 1, 2, and 4,
The radio frequency unavailability determination result display means displays the number of successes and failures in determining whether or not the unusable registration deletion candidate is usable when displaying the determination result and the determination index value of the unusable registration deletion candidate. A radio frequency management apparatus that displays the number of times together. With reference to the unusable registration history storage means for storing as history information the date and time when the radio frequency was registered in the unusable frequency list and the date and time when the radio frequency was deleted from the unusable frequency list, the history information is preset. Based on a plurality of generation algorithms, a determination index value for extracting candidates for radio frequencies to be deleted from the unusable frequency list is generated for each radio frequency and generation algorithm registered in the unusable frequency list. A determination index value generation step;
An unusable registration deletion candidate extraction step of extracting, as unusable registration deletion candidates, radio frequencies whose determination index value satisfies a predetermined extraction condition among unusable radio frequencies registered in the unusable frequency list; ,
A radio frequency availability determination step for determining whether or not the unusable registration deletion candidate is usable;
When it is determined that an unusable registration deletion candidate based on a determination index value calculated by a generation algorithm selected from the outside among the plurality of generation algorithms is usable, the unusable registration deletion candidate is added to the unusable frequency list. An unusable registration deletion step of updating the deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage means,
Determination index value based on which a radio frequency registered in the unusable frequency list is extracted as the unusable registration deletion candidate, identification information indicating a generation algorithm of the determination index value, and use of the unusable registration deletion candidate Radio frequency availability determination result history storage step for storing the determination result of availability in the radio frequency availability determination result history storage means as history information;
Radio for displaying the determination result of the availability of the unusable registration deletion candidate and the determination index value for each determination index value generation algorithm based on the history information stored in the radio frequency availability determination result history storage means A radio frequency management method, comprising: a step of displaying a determination result of availability of frequency. The radio frequency management method according to claim 6,
Further, the method includes a determination index value generation algorithm selection step of selecting any one of the plurality of generation algorithms according to an instruction from the outside,
The unusable registration deletion step is performed when the unusable registration deletion candidate based on the determination index value calculated by the generation algorithm selected in the determination index value generation algorithm selection step is determined to be usable. A radio frequency management method comprising: deleting a candidate from the unusable frequency list and updating a deletion date and time of the unusable registration deletion candidate stored in the unusable registration history storage unit.

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