JP4984845B2 - Polling communication system, host device, terminal device, and polling communication control method - Google Patents

Description

  The present invention relates to a polling communication system, a host device, a terminal device, and a polling communication control method that reduce the time required for polling and response.

Patent Document 1 discloses that in a polling communication system, when a single parent device performs polling for each child device, the parent device No. 1 polling, handset No. 1 to the master unit, the master unit to the slave unit No. 2 polling, handset No. 2 to the base unit,... n polling, slave unit no. In addition to the method of repeating the polling of the parent device and the response of the child device corresponding to the polling (FIG. 1 of Patent Document 1), such as the response from n to the parent device, the parent device is the child device No. 1, No. 1 2,... n is unilaterally and continuously polled. 1, No. 1 2,... A system (FIG. 5 of Patent Document 1) in which n responds in turn to the base unit is disclosed. Compared with the former communication method, the latter communication method can reduce the entire communication time.
Japanese Patent Laid-Open No. 10-24287

In the Japanese Patent Application No. 2005-29551 3 (filing date: October 7, 2005, hereinafter referred to as “prior application”), the applicant responds to a polling command from the host device to the terminal device. A polling system communication system has been disclosed in which the response time to the host device is changed from the conventional fixed time system to a variable time system corresponding to the type of polling command, and the overall communication time is shortened (S11, S12 in FIG. 6 of the prior application). In the prior application, the variable time method is applied to the alternate communication method of polling and response in FIG. 1 of Patent Document 1 (FIG. 8 of the prior application), and the continuous polling method in FIG. 5 of Patent Document 1. (Fig. 7 of the previous application) is disclosed.

  In the polling communication system of the prior application, one separate frequency is assigned to the polling command signal from the host device to each terminal device and to the response signal from each terminal device to the host device.

  When the number of terminal devices increases with respect to a single host device, multiple frequencies are prepared for response signals, the terminal devices are grouped, and each terminal device uses a response signal assigned to its own group. It is efficient to return responses to the host device in a predetermined response order with respect to frequency. In such a group-specific polling system, if the frequency allocation system of the prior application in which one different frequency is allocated for each of the polling command signal and the response signal is adopted, the polling command signal and the response signal are assigned to each group. Therefore, 2 × n (where n is the number of groups) frequencies are required for the entire polling communication system, which is enormous.

  In order to cope with this, although one frequency is assigned to each group for the response signal, it is conceivable to assign a common frequency to all groups for the polling command signal. In this case, the number of frequencies required for the entire polling communication system is 1 + n, and the number of necessary frequencies can be saved.

  However, if there is an imbalance in the number of terminal devices in each group, the time required from the start of polling transmission to the end of responses from all terminal devices in the group will be imbalanced for each group, and the number of terminal devices belonging to it will be small The group waits for a long time until the next polling command is transmitted from the host device after the response of the last terminal device is completed. The polling efficiency of the entire system is deteriorated. Even if the number of terminal devices belonging to a group is evenly allocated among the groups, an imbalance frequently occurs at each time. For example, in a polling communication system for a vehicle such as a taxi, the number of vehicles to be polled in each group becomes unbalanced due to a vehicle that is temporarily in operation or ends or starts business. .

  FIG. 10 is a configuration diagram of a vehicular polling communication system 100 in which a plurality of mobile stations 30 are grouped to rationalize polling processing. In the vehicle polling communication system 100, the same reference numerals are used to designate the parts common to the vehicle polling communication system 10 of FIG. 1 described later as the best mode of the present invention, and detailed description thereof is omitted. The main points are described.

  In the vehicle polling communication system 100, a plurality of response signal radio waves having different frequencies are allocated. For convenience of explanation, it is assumed that the response signal radio waves are two waves Fm1 and Fm2. The frequencies of Fm1 and Fm2 are different from the frequency of the radio wave Fb1 for polling commands. The vehicle 35, and hence the mobile station 30 mounted thereon, is divided into two groups corresponding to the number of response signal radio waves Fm1, Fm2.

  A vehicle 35 shown by a solid line and a broken line indicates that it is currently operating and at rest. The grouping of the vehicles 35 is initially performed so that the vehicles 35 of each group are equal among the groups. At each time point, the number of the vehicles 35 in operation is the temporary number of the partial vehicles 35 in the group. There is an imbalance between the groups due to vehicle stoppages and the entry and exit of vehicles such as the end and start of work on the day. Since polling is performed only for the mobile stations 30 of the vehicle 35 operating at each time point, the time required for responses from all the mobile stations 30 in each group is unbalanced among the groups.

  FIG. 11 is a time chart of each signal in the vehicle polling communication system 100. The base station 20 transmits polling commands in the order of groups 1 and 2 using the radio wave Fb1. The mobile stations 30 of the groups 1 and 2 that have received the polling commands for the groups 1 and 2 respond in a predetermined order. The response start from the first mobile station 30 of the groups 1 and 2 is performed after the transmission of the polling commands for the groups 1 and 2, respectively.

  The next polling command for the groups 1 and 2 from the base station 20 is the same order as the previous group order, that is, the group 1 and 1 as soon as the response from the mobile stations 30 of the groups 1 and 2 to the previous polling command is completed. It is performed in the order of 2. Therefore, as shown in FIG. 10, since the number of mobile stations 30 to which the group 2 belongs is small as shown in FIG. 10, transmission of the next polling command for the group 2 is started even if responses from all of the mobile stations 30 end quickly. Will wait until transmission of the group 1 response polling command from the base station 20 is completed. When the imbalance of the number of mobile stations 30 belonging to the group increases, the time for which the mobile stations 30 in the group with a small number of mobile stations 30 wait for the next polling command increases, and the response signal assigned to the group The communication efficiency of radio waves decreases, and the communication efficiency of the vehicle polling communication system 100 as a whole also decreases.

  Further, if the number of groups is n, in the polling system of the vehicle polling communication system 100, the number of required radio waves is 1 + n, and no further radio wave saving can be expected.

  An object of the present invention is to group terminal devices when a plurality of response signal radio waves are used to reduce polling required time. A polling communication system, a host device, a terminal device, and a polling communication control method that can be maintained are provided.

  Another object of the present invention is to further provide a polling communication system, a host device, a terminal device, and a polling communication control method for reducing the number of radio waves used.

  According to the present invention, the polling command from the host device includes the group information and response rank information of each terminal device together with the type of command. From the information, the group information and the response order information are such that the group assigned to each terminal device and the response order within the group can be detected in the current polling. For example, the group information and the response order information are the destination list information of the terminal device in the polling command.

  According to the present invention, the polling command signal radio wave also serves as a predetermined single group response signal radio wave.

  The polling communication system of the present invention includes a single host device that performs polling and a plurality of terminal devices that respond to polling.

The host device of the present invention has the following means.
Polling command transmission means for transmitting each polling command including group information and response ranking information of each terminal device together with the type of command using a polling command signal radio wave having a frequency common to each terminal device, and from each terminal device Response receiving means for receiving a response with a radio wave assigned to a group determined for each terminal device based on the group information and an intra-group response rank determined for each terminal device based on the response rank information.

The terminal device of the present invention has the following means.
A polling command receiving means for receiving each polling command including the group information and response order information of each terminal device together with the command type by a polling command signal radio wave having a frequency common to each terminal device , and self-determination determined based on the group information. Response transmission means for responding with a response rank within the own device group determined by radio waves assigned to the device group and based on the response rank information.

The polling communication system of the present invention has the following steps.
Transmitting each polling command including group information and response order information of each terminal device together with the type of command from the host device using a polling command signal radio wave having a frequency common to each terminal device ;
Receiving the polling command at each terminal device;
Performing a response with a radio wave assigned to the own machine group determined based on the group information in each terminal device, and with a response rank within the own machine group determined based on the response rank information;
In the host device, a response from each terminal device is a radio wave assigned to a group determined for each terminal device based on the group information, and an in-group response order determined for each terminal device based on the response order information. Receiving step.

  According to the present invention, the polling command includes group information and response order information together with the type of command. Then, the radio wave assigned to each terminal device for a response signal and the response order of each terminal device in the radio wave can be detected based on the group information and the response order information. Thus, it is possible to improve the communication efficiency of the entire polling communication system by determining the group assignment and the response order so that the number of terminal devices using each response signal radio wave is balanced among the response signal radio waves. .

  FIG. 1 is a schematic configuration diagram of a vehicle polling communication system 10. The vehicle polling communication system 100 in FIG. 10 has a fixed group, whereas the vehicle polling communication system 10 is characterized in that the group can be changed flexibly for each polling. . Although details will be described later in FIG. 4, when the number of groups = n, in the vehicle polling communication system 10, the total number of radio waves used for polling command signals and response signals is n. This is one less than in the case of the vehicle polling communication system 100. n may be an arbitrary natural number equal to or greater than 2, but for the sake of simplification of description, n = 2 is assumed below.

  The vehicle polling communication system 10 is used as a vehicle allocation management system such as a taxi, a truck, or a bus. The vehicle polling communication system 10 includes a single base station 20 and a plurality of mobile stations 30. The base station 20 is installed at a predetermined location as a fixed station. On the other hand, the mobile station 30 is mounted on a vehicle 35 such as a taxi, a truck or a bus. The vehicle 35 indicated by the solid line and the broken line indicates that the vehicle 35 is in operation and is at rest. Polling from the vehicle polling communication system 10 is performed on the mobile station 30 mounted on the currently operating vehicle 35, and the mobile station 30 of the suspended vehicle 35 is excluded from the polling target. The

  In the vehicle polling communication system 10, two radio waves Fb1 and Fm1 having different frequencies are used. The radio wave Fb1 is used for a polling command signal and also for a group 1 response signal. The radio wave Fm1 is used exclusively for the group 2 response signal.

  FIG. 2 is a configuration diagram of the base station 20 and the mobile station 30. The base station 20 includes a PC (personal computer) 21, a base station modem 22, and a wireless device 23. The base station modem 22 generates a transmission signal corresponding to the polling command from the PC 21, and the transmission signal is converted into a radio wave of a predetermined frequency allocated for the polling command in the wireless device 23 and released to the surroundings. . The radio 23 receives radio waves from each mobile station 30, and the received signal is converted to a predetermined intermediate frequency, then sent to the base station modem 22, and data is extracted by demodulation in the base station modem 22. The The base station modem 22 sends the data and uniquely generated data and signals to the PC 21.

  The mobile station 30 includes a mobile station modem 31 and a radio device 32, moves within a predetermined area range, and communicates with the base station 20 from an arbitrary location within the area range.

  FIG. 3 is a structural diagram of the polling command. In the polling command, the type of command is arranged at the head, and a list of destination mobile stations 30 is arranged subsequently thereto. The order of appearance of each mobile station 30 in the transmission destination list (the order from the top of the list) uniquely determines the group and the response order in each group for each mobile station 30.

  In the example of FIG. 3, the mobile stations 30 that are odd-numbered in the appearance order in the transmission destination list belong to the group 1, and the mobile stations 30 that are even-numbered belong to the group 2. In addition, the response rank of each mobile station 30 in each group is the appearance rank for the mobile stations 30 in the same group in the transmission destination list.

  In the example of FIG. 3, the vehicles 1, 3, 5,. In addition, vehicles 2, 4, 6,... That are even numbers in the transmission destination list are in group 2. The response order of the mobile stations 30 in the group 1 is the order of the mobile stations 30 of the vehicles 1, 3, 5,. The response order of the mobile stations 30 in the group 2 is the order of the mobile stations 30 of the vehicles 2, 4, 6,.

  The group to which each mobile station 30 belongs is generally described assuming that the number of groups is not 2 but the number of groups is n. Consider the Nth mobile station 30 from the top in the destination list. Let the remainder of N / n be m. When m ≠ 0, the group to which the mobile station 30 belongs is the m-th group. When m = 0, the group to which the mobile station 30 belongs is the nth group. The response order of each mobile station 30 in each group is the order in which the vehicles 35 belonging to the same group are counted from the top of the polling command transmission destination list. This is just an example. In another example, the remainder +1 may be used as a group number, and the order of the vehicles 35 belonging to the same group from the tail of the transmission destination list may be set as the response rank of each mobile station 30 in the group.

  Let L be the total number of mobile stations 30 in the destination list, Q be the integer quotient when L is divided by n, and m be the remainder. When m = 0, the number of mobile stations 30 to which each group belongs is L / n for any group. When m ≠ 0, the number of mobile stations 30 belonging to the m groups is Q + 1, and the number of mobile stations 30 belonging to the other (n−m) groups is Q. However, since normally Q >> 1, the number of mobile stations 30 belonging to each group can be considered to be balanced among the groups.

  In the polling command structure of FIG. 4, the command types are common to all groups, but the command types can be different for each group. In this case, the command type area in the polling command structure is divided into the number of groups, and the command types for groups 1, 2,.

  FIG. 4 is a time chart of each signal in the vehicle polling communication system 10. The polling command radio wave is also used as the group 1 (G1) response signal radio wave Fb1. The radio wave Fm1 is dedicated to the group 2 (G2) response.

  As soon as the transmission of the polling command from the base station 20 is completed, the response period from the mobile stations 30 in the group 1 uses the radio wave Fb1 and the response from the mobile stations 30 in the group 2 Uses radio waves Fm1. When the total number of currently operating mobile stations 30 in the vehicular polling communication system 10 is an even number, the number of active mobile stations 30 in the groups 1 and 2 is equal. The number of active mobile stations 30 in one is larger by one than the number of active mobile stations 30 in group 2. However, the difference in the number of active mobile stations 30 between groups is 0 or at most 1 even when the total number of groups is 3 or more, and the response period of group 1 is at most one mobile station 30 than that of group 2. It is only as long as the response. Accordingly, the total response time from all mobile stations 30 in each group is made uniform among the groups. Transmission of the next polling command from the base station 20 is started as soon as the response period of the group in which the response period is the maximum, that is, the group 1 in which the number of mobile stations 30 to which it belongs is increased by 1, is completed.

  In this way, the response period in each group is balanced, and the number of mobile stations 30 belonging to the group is at most 1, so the free time of the response signal radio wave Fm1 for group 2 that has the maximum free time. The communication efficiency of the vehicle polling communication system 10 as a whole can be increased. Further, in the vehicle polling communication system 10, the total number of radio waves used for polling can be set to n-1 with respect to n of the vehicle polling communication system 100 in FIG. However, n = the number of groups.

  FIG. 5 is a flowchart of processing executed when the base station modem 22 of the base station 20 receives a polling command from the PC 21. When the base station modem 22 receives a polling command from the PC 21 (S45), it calculates a polling transmission / reception time related to the polling command (S46). The polling transmission / reception time is the time from the front end time of Fb1 polling to the rear end time of the mobile station response G1 in FIG. As described above, in the vehicle polling communication system 10, the number of mobile stations 30 belonging to group 1 is equal to or larger by 1 than the number of mobile stations 30 belonging to group 2, that is, in FIG. Since the time length of the mobile station response G1 is equal to or longer than the time length of the mobile station response G2, the end time of the polling transmission / reception time is set to the rear end time of the mobile station response G1 in FIG.

  After calculating the polling transmission / reception time, it is determined whether or not the base station 20 is currently waiting for a response from the mobile station 30 (S47), that is, whether the previous polling has not been completed yet. Alternatively, it is determined whether it has already been completed. If it has been completed, the process proceeds to S48, and if it has not been completed, the process proceeds to S53. Note that the determination in S47 as to whether or not it is a reception waiting period is, specifically, a reception waiting time variable (at the time of execution of S47, the value of the reception waiting time variable is the last movement in the previous polling from the present time. It is a value corresponding to the time until the response from the station 30 is completed.

  If the process proceeds to S48, the transmission / reception time calculated in S46 is substituted into the reception waiting time variable (S48), and then a polling command (FIG. 3) with the destination list added is transmitted from the wireless device 23 (S49). ). Thereafter, the base station modem 22 enters a sleep state.

  When the process proceeds to S53, the wireless transmission of the polling command from the wireless device 23 is suspended, that is, waiting for transmission (S53), and a sleep state is entered.

  FIG. 6 is a flowchart of processing executed by the base station modem 22 of the base station 20 every time a fixed time elapses. An outline of the algorithm of the processing will be described. Every time a unit time elapses, the value of the reception waiting time variable is decremented by 1 (S61), and as soon as the value of the reception waiting time variable becomes 0, the processing of S53 in FIG. The transmission wait is canceled and the polling command is wirelessly transmitted (S62 → S63 → S64).

  Each step of FIG. 6 will be described in detail. In S60, the flow of FIG. 6 is activated (started) by the output from the unit time timer. In S61, the value of the reception waiting time variable is decremented by 1. In S62, it is determined whether or not the value of the reception waiting time variable = 0. If the determination is positive, the process proceeds to S63, and if not, the process returns to the sleep state. The processing of S63 and S64 is the same as the processing of S48 and S49 in FIG.

  FIG. 7 is a flowchart of processing executed when the mobile station modem 31 of the mobile station 30 wirelessly receives a polling command. Describing the processing algorithm schematically, when the mobile station modem 31 receives a polling command, the mobile station modem 31 starts a transmission timer (S69), and the group assigned to the own device and the own device group for this polling. Is calculated based on the destination list in the polling command (S70). Based on the transmission timer, a response is made as soon as it is detected that the timing corresponding to the transmission order of the own device has come (S71 is positive) (S72).

  Each step of FIG. 7 will be described in detail. In S68, a polling command is received from the base station 20. In S69, a transmission timer is started. The transmission timer is used to detect the transmission timing of the response. In S70, the own device's belonging group and the own device's transmission order within the belonging group in the current polling are determined from the polling command transmission destination list (the portion after the command type in FIG. 3).

  In S71, the value of the transmission timer activated in S69 is compared with the value related to the transmission timing corresponding to the transmission order determined in S70 to determine whether or not the current time is the transmission timing of the own device. Then, as soon as the determination becomes positive, the process proceeds to S72, and a response is wirelessly transmitted from the wireless device 32.

  FIG. 8 is a configuration diagram of a polling communication system 75 in which the host device 76 and the terminal device 77 are represented by functional block diagrams. The polling communication system 75 includes a single host device 76 that performs polling and a plurality of terminal devices 77 that respond to polling. The vehicle polling communication system 10 (FIG. 1) is an example of the polling communication system 75. The base station 20 and the mobile station 30 in the vehicle polling communication system 10 are examples of the host device 76 and the terminal device 77. The polling communication system 75 is not limited to a vehicle allocation management system such as a taxi, truck, or bus, but may be a security system, a device management system for a factory, a building, or a site, a measurement system for road conditions, or the like. The host device 76 is not limited to a fixed station, but may be mounted on a vehicle and appropriately movable. The terminal device 77 may be fixed in place without being mounted on a vehicle or carried by a person.

  The host device 76 includes a polling command transmission unit 81 and a response reception unit 82. The polling command transmission means 81 transmits a polling command including group information and response rank information of each terminal device 77 together with the type of command. The response receiving means 82 sends the response from each terminal device 77 to the group determined for each terminal device 77 based on the group information and within the group determined for each terminal device 77 based on the response order information. Receive in response order.

  The terminal device 77 has a polling command receiving unit 85 and a response transmitting unit 86. The polling command receiving unit 85 receives a polling command. The response transmission means 86 responds with the radio wave assigned to the own group determined based on the group information and the response rank within the own group determined based on the response rank information.

  Using the response signal radio waves, the plurality of terminal devices 77 are divided into groups equal to the number of response signal radio waves, and each terminal device 77 has a response signal for a group to which each terminal device 77 belongs. It is advantageous to respond in sequence using radio waves, which reduces the time required for polling. However, as in the case of FIG. 10, the number of terminal devices 77 belonging to each group is equal among the groups. As such, even if it is set at the beginning of the operation of the polling communication system 75, at each time, the individual terminal devices 77 are stopped, the start of operation or the end of the operation ends, and the belonging of each group The number of terminal devices 77 becomes uneven.

  On the other hand, in the polling communication system 75, the polling command includes the group information and response order information of each terminal device 77 together with the type of command, so that the group to which each terminal device 77 belongs is assigned to each polling. The terminal devices 77 in operation can be grouped so that the number of terminal devices 77 belonging to each group is equal among the groups in each polling. Thereby, the time required for polling can be shortened.

  Typically, the polling command signal radio wave also serves as a predetermined single group response signal radio wave. This saves the number of radio waves used in the polling communication system 75. In particular, if you do not want to reduce the number of required radio waves, stop sharing the polling command signal radio wave and one response radio wave, and prepare the same number of response signal radio waves as the group for each group. Even in this case, the effect of shortening the time required for polling is guaranteed. That is, in the example of FIG. 4, similarly to the case of FIG. 10, the radio waves Fm1 and Fm2 can be assigned to the groups 1 and 2, respectively.

  Typically, the polling command includes a polling command destination list. The group and the response order related to the group information and the response order information are uniquely determined according to the order of each terminal device in the transmission destination list.

  FIG. 3 described above is a specific example in which the destination list is included in the polling command. In FIG. 3, the destination list is a vehicle list, but there is a 1: 1 relationship between the vehicle and the terminal device, and the destination list in FIG. 3 means the destination list of the terminal device.

  According to an example of determining groups and response ranks in the vehicle polling communication system 10, the number of groups is n, the rank of the mobile device in the destination list for each mobile station 30 is N, and the integer quotient when N is divided by n and When the remainders are defined as Q and m, respectively, the terminal device 77 with m ≠ 0 becomes the mth group, and the terminal device 77 with m = 0 becomes the nth group. For each terminal device 77, the response rank in each group is the rank when only the terminal devices 77 in the same group are counted from the top of the destination list.

  FIG. 9 is a flowchart of the polling communication control method 90. The polling communication control method 90 is applied to the polling communication system 75. S91 and S94 are processes corresponding to the functions of the polling command transmission unit 81 and the response reception unit 82 of the host device 76, respectively. S92 and S93 are processes corresponding to the functions of the polling command receiving means 85 and the response transmitting means 86 of the terminal device 77, respectively.

  Further, in the relationship between the polling communication control method 90 and the flow of FIGS. 5 to 7, a specific example of S91 is the flowchart of FIGS. A specific example of S92 is S68 of FIG. 6, and a specific example of S93 is all steps other than S68 of FIG.

  In S91, a polling command including group information and response order information of each terminal device 77 is transmitted from the host device 76 together with the type of command. In S92, each terminal device 77 receives a polling command.

  In S93, each terminal device 77 responds with the radio wave assigned to the own device group determined based on the group information and the response rank within the own device group determined based on the response order information. In S94, in the host device 76, the response from each terminal device 77 is a radio wave assigned to a group determined for each terminal device 77 based on the group information, and is determined for each terminal device 77 based on the response order information. Receive in response order within the group.

  Although the present invention has been described with respect to various specific embodiments, the present invention is not limited to this, and each component in the various specific embodiments is modified (including deletion) without departing from the gist of the invention. And can be materialized. Moreover, what substituted the component between various concrete forms, or combined the some component of various concrete forms in the range which does not deviate from the summary of invention is also contained in the concept of this invention.

It is a schematic block diagram of the polling system communication system for vehicles which performed grouping flexibly. It is a block diagram of a base station and a mobile station. It is a structure diagram of a polling command. It is a time chart of each signal in the polling system communication system for vehicles. It is a flowchart of the process performed when the base station modem of a base station receives a polling command from PC. It is a flowchart of the process which the base station modem of a base station performs for every fixed time progress.

It is a flowchart of the process performed when the mobile station modem of a mobile station receives a polling command by radio. It is a block diagram of the polling system communication system which represented the host device and the terminal device with the functional block diagram. It is a flowchart of a polling system communication control method. 1 is a configuration diagram of a vehicle polling communication system in which a plurality of mobile stations are fixedly grouped to rationalize polling processing. It is a time chart of each signal in the polling system communication system for vehicles of FIG.

Explanation of symbols

75: Polling method communication system, 76: Host device, 77: Terminal device, 81: Polling command transmission means, 82: Response reception means, 85: Polling command reception means, 86: Response transmission means, 90: Polling method communication control method .

Claims (8)

In a polling communication system including a single host device that performs polling and a plurality of terminal devices that respond to polling,
The host device is
Polling command transmission means for transmitting each polling command including group information and response ranking information of each terminal device together with the type of command using a polling command signal radio wave having a frequency common to each terminal device, and from each terminal device A response receiving means for receiving a response in a radio wave assigned to a group determined for each terminal device based on the group information and in an intra-group response ranking determined for each terminal device based on the response ranking information;
Have
The terminal device is
A polling command receiving means for receiving the polling command, and a response transmitting means for responding with a radio wave assigned to the own machine group determined based on the group information and in a response rank within the own machine group determined based on the response rank information ,
A polling communication system characterized by comprising: The polling communication system according to claim 1, wherein the polling command signal radio wave having the common frequency also serves as a predetermined single group response signal radio wave.   The polling command includes a destination list of polling commands as the group information and the response order information, and the group and response order of each terminal device are uniquely determined corresponding to the order of each terminal device in the destination list. The polling communication system according to claim 1 or 2, wherein the polling communication system is configured. Polling command transmission means for transmitting each polling command including group information and response ranking information of each terminal device together with the type of command using a polling command signal radio wave having a frequency common to each terminal device, and from each terminal device A response receiving means for receiving a response in a radio wave assigned to a group determined for each terminal device based on the group information and in an intra-group response ranking determined for each terminal device based on the response ranking information;
A host device characterized by comprising: 5. The host apparatus according to claim 4, wherein the polling command signal radio wave having the common frequency also serves as a predetermined single group response signal radio wave. A polling command receiving means for receiving each polling command including the group information and response order information of each terminal device together with the command type by a polling command signal radio wave having a frequency common to each terminal device , and self-determination determined based on the group information. A response transmission means for performing a response with a radio wave assigned to the machine group and with a response rank within the own machine group determined based on the response rank information;
A terminal device. 7. The terminal apparatus according to claim 6, wherein the polling command signal radio wave having a common frequency also serves as a predetermined single group response signal radio wave. In a control method for a polling communication system including a single host device that performs polling and a plurality of terminal devices that respond to polling,
Transmitting each polling command including group information and response order information of each terminal device together with the type of command from the host device using a polling command signal radio wave having a frequency common to each terminal device ;
Receiving the polling command at each terminal device;
Performing a response with a radio wave assigned to the own machine group determined based on the group information in each terminal device, and with a response rank within the own machine group determined based on the response rank information;
In the host device, a response from each terminal device is a radio wave assigned to a group determined for each terminal device based on the group information, and an in-group response order determined for each terminal device based on the response order information. Receiving step,
Features and to Lupo-ring type communication control method further comprising a.

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