JP6844674B2 - Transmitter, receiver, communication system - Google Patents

Description

The present invention relates to communication technology, and more particularly to a transmitting device, a receiving device, and a communication system for transmitting data.

In multicast communication, the same distribution information is broadcast to a plurality of terminal devices. The information content of the traffic information, which is the distribution information, is composed of a plurality of sub-contents including an area identifier and one or more traffic information of this area. When the terminal device determines that the traffic information is valid information based on the area identifier of the sub-content, the terminal device provides the traffic information to the operator of the terminal device (see, for example, Patent Document 1).

JP-A-2007-28022

By including the area identifier, it is possible to transmit information to a terminal device existing in a predetermined area. However, if time has passed since the transmission of such information, each terminal device may be moving, so that the information is transmitted again to the terminal device at the time when the information was previously transmitted. That is difficult.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for transmitting data to a terminal device that has existed in a predetermined area in the past.

In order to solve the above problems, the transmission device of an embodiment of the present invention includes a display unit that displays area information as an option, and (1) area information that indicates an area to be received data selected by the display unit. , The generation unit that generates the identification information associated with the timing at which the area information should be transmitted, and (2) the first combination including the area information, and the first combination generated by the generation unit are transmitted. It includes a transmission unit and a storage unit that stores the first combination of transmissions. The display unit additionally displays the identification information in the first combination stored in the storage unit as options, and the generation unit additionally displays the identification information selected in the timing after the timing associated with the identification information in the first combination. A second combination including the data and the data is generated, and the transmission unit transmits the second combination generated by the generation unit.

It should be noted that any combination of the above components and the conversion of the expression of the present invention between methods, devices, systems, recording media, computer programs and the like are also effective as aspects of the present invention.

According to the present invention, data can be selectively transmitted to a terminal device that has existed in a predetermined area in the past.

It is a figure which shows the structure of the communication system which concerns on Example 1 of this invention. It is a figure which shows the area formed in the communication system of FIG. It is a figure which shows the time change of the terminal apparatus included in the area of FIG. It is a figure which shows the structure of the command station of FIG. It is a figure which shows the transmission control screen which is displayed on the display part of FIG. It is a figure which shows the data structure of the table stored in the storage part of FIG. 7 (a)-(c) are diagrams showing the format of the signal transmitted from the transmission unit of FIG. It is a figure which shows another transmission control screen which is displayed on the display part of FIG. It is a figure which shows still another transmission control screen displayed on the display part of FIG. It is a figure which shows the structure of the terminal apparatus of FIG. It is a flowchart which shows the transmission procedure by the transmission device of FIG. It is a flowchart which shows the receiving procedure by the receiving device of FIG. 13 (a)-(b) is a diagram showing a format of a signal transmitted from a transmission unit according to a second embodiment of the present invention.

(Example 1)
Before explaining the present invention in detail, first, an outline will be given. The first embodiment of the present invention relates to a communication system in which a command station transmits data to a plurality of terminal devices via a base station device. In this embodiment, it is assumed that the communication system is a commercial radio and the data is voice information. Here, the command station specifies an area to which voice information should be transmitted, and PTT (Push To Talk) is executed. The voice information transmitted from the command station is received by one or more terminal devices located in a designated area via the base station device.

In such a situation, after transmitting the voice information to one or more terminal devices located in a predetermined area, it may be desired to transmit the voice information to the one or more terminal devices again. However, the farther the timing at which the voice information is first transmitted and the timing at which the voice information should be transmitted next are, the more the terminal device located in the predetermined area may go out of the predetermined area. Will be higher. Therefore, it is difficult to transmit voice information to a terminal device located in a predetermined area in the past. In order to deal with this, the communication system according to the present embodiment executes the following processing.

When transmitting voice information, the command station generates area information indicating an area for receiving voice information and identification information (hereinafter, may be referred to as "ID") associated with the transmission timing. The command station transmits the first combination including the area information, the voice information, and the identification information via the base station apparatus. The terminal device positions the current position. Further, when the terminal device receives the first combination, it determines whether or not it is located in the area indicated by the area information. When located in the area, the terminal device reproduces the voice information included in the first combination, outputs the voice, and holds the identification information.

When voice information is transmitted to the terminal device located in the area indicated by the area information already transmitted after the predetermined period has elapsed after such processing is executed, the command station has already transmitted the identification information and voice. A second combination containing the information is transmitted. When the terminal device receives the second combination, the terminal device compares the identification information included in the second combination with the holding identification information. When both match, the terminal device reproduces the audio information included in the second combination and outputs the audio.

FIG. 1 shows the configuration of the communication system 100 according to the first embodiment of the present invention. The communication system 100 includes a command station 10, a network 12, a base station device 14, and a terminal device 16. The number of the base station device 14 and the terminal device 16 included in the communication system 100 is not limited to "1", but here, for the sake of clarity, only one of the base station device 14 and the terminal device 16 is "1". Shown.

The command station 10 receives an instruction from the operator regarding an area to which voice information should be transmitted via a console serving as a user interface. Further, when the command station 10 receives the voice from the operator via the microphone connected to the console while the PTT button is pressed down, the command station 10 generates voice information from the voice. The command station 10 transmits voice information to the base station device 14 via the network 12, and the base station device 14 transmits voice information. The base station device 14 and the terminal device 16 correspond to a commercial radio, and the transmission corresponds to a broadcast transmission.

When the terminal device 16 is located in the area designated by the command station 10, the terminal device 16 reproduces the received voice information and outputs the voice. The area instruction differs depending on whether the terminal device 16 currently located in the designated area receives the voice information or the terminal device 16 located in the designated area in the past receives the voice information. Instructions for such areas will be described later. Although it is possible for the terminal device 16 to transmit voice information to the command station 10, the description of such a case will be omitted here.

FIG. 2 shows a communicable range 204 in which communication from the base station device 14 to the terminal device 16 in the communication system 100 is possible, and an area instructed by the command station 10. Here, as an example, it is assumed that two areas, the first area 200 and the second area 202, are designated in the communicable range 204. When each area has a circular shape as shown in FIG. 2, the area information indicating the range of each area is composed of the latitude / longitude of the center position of the area and the radius of the area. The area is not limited to a circular shape, but here, for the sake of clarity, the area is assumed to be circular.

FIG. 3 shows the time change of the terminal device 16 included in the area. Here, as an example, the first area 200 and the second area 202 at the three times of "10:00", "11:00", and "12:00" are shown. In the following description, "10:00", "11:00", and "12:00" may be referred to as "first timing", "second timing", and "third timing". Further, the first area 200 and the second area 202 are shown in the same manner as in FIG. Further, in FIG. 3, a first terminal device 16a, a second terminal device 16b, and a third terminal device 16c are shown.

At the first timing, "10:00", the first terminal device 16a and the second terminal device 16b are located in the first area 200, and the third terminal device 16c is located in the second area 202. Further, at "11:00", which is the second timing after the first timing, the first terminal device 16a and the third terminal device 16c are located in the first area 200, and the second terminal device 16b is in the second area 202. Located inside. That is, the second terminal device 16b has moved from the first area 200 to the second area 202, and the third terminal device 16c has moved from the second area 202 to the first area 200. Further, at "12:00", which is the third timing after the second timing, the first terminal device 16a and the third terminal device 16c are located in the first area 200, and the second terminal device 16b is in the second area 202. Located inside.

In this embodiment, after the voice information is transmitted to the first terminal device 16a and the second terminal device 16b located in the first area 200 at the first timing, the first terminal device 16a, the first terminal device 16a, also at the third timing. 2 The purpose is to transmit voice information to the terminal device 16b. As shown, the first terminal device 16a is located in the first area 200 at the third timing, while the second terminal device 16b is located in the second area 202.

FIG. 4 shows the configuration of the command station 10. The command station 10 includes a transmission device 20. The transmission device 20 includes a microphone 30, an operation unit 32, a display unit 34, a generation unit 36, a storage unit 38, and a transmission unit 40. The command station 10 may include a function other than the transmission device 20, for example, a reception function, but the description thereof will be omitted here.

The operation unit 32 is an input interface that receives an instruction from an operator who uses the command station 10. The operation unit 32 is composed of a keyboard, a mouse, a touch panel, and the like. The display unit 34 is a monitor that displays a screen for prompting the operator to input an instruction. The generation unit 36 is connected to the operation unit 32 and the display unit 34, generates a screen to be displayed on the display unit 34, and acquires an instruction received by the operation unit 32. Here, an instruction from the operator received by the operation unit 32 and the display unit 34 will be described while showing the screen displayed on the display unit 34.

The screen displayed at "10:00", which is the first timing of FIG. 3, is shown in FIG. FIG. 5 shows a transmission control screen displayed on the display unit 34. At the first timing, it is assumed that the voice information is received by the terminal device 16 located in the first area 200 of FIG. The operator selects the "first area" as the reception target area while using the operation unit 32. The generation unit 36 acquires an instruction for selecting the "first area" from the operation unit 32. In addition, although the previously specified area is indicated in "Area designation (previous)", "(NONE)" is displayed here because there is no previous transmission, and the options are not displayed. Further, the operator selects the "PTT" button while using the operation unit 32 to input voice to the microphone 30 of FIG. The microphone 30 changes the voice into an electric signal, and then outputs the electric signal (hereinafter, referred to as “voice information”) to the generation unit 36.

Since the option of "area designation (previous)" is not selected, the generation unit 36 generates the area information indicating the first area 200 to which the voice information is received. Further, the generation unit 36 generates identification information, for example, ID "1", which is associated with the area information in which the first area 200 is indicated and the first timing "10:00" to which the area information should be transmitted. Further, the generation unit 36 generates the first combination including the area information, the identification information, and the voice information. Return to FIG. The generation unit 36 outputs the first combination to the transmission unit 40, and stores the contents of the first combination in the storage unit 38.

The storage unit 38 stores the contents of the first combination in response to an instruction from the generation unit 36. FIG. 6 shows the data structure of the table stored in the storage unit 38. At the first timing "10:00", the information included in the line of the message number "1" is stored. Here, the area information and the ID which is the identification information are collectively referred to as control information. Return to FIG.

The transmission unit 40 receives the first combination from the generation unit 36. The transmission unit 40 transmits the first combination to the base station apparatus 14 via a network 12 (not shown). 7 (a)-(c) show the format of the signal transmitted from the transmission unit 40. FIG. 7A shows the format of the first combination. Here, "area information", "identification information", and "voice information" are included. 7 (b)-(c) will be described later, and the process returns to FIG. The first combination is broadcast-transmitted from the base station apparatus 14 and received by the terminal apparatus 16.

Following this, the screen displayed at "11:00", which is the second timing of FIG. 3, is shown in FIG. FIG. 8 shows another transmission control screen displayed on the display unit 34. At the second timing, it is assumed that the voice information is received by the terminal device 16 located in the second area 202 of FIG. The operator selects the "second area" as the reception target area while using the operation unit 32. The generation unit 36 acquires an instruction for selecting the “second area” from the operation unit 32. In the "area designation (previous)", the option "first area (10:00)" is displayed according to the transmission at the first timing. Here, the display of "area designation (previous)" is made based on the table stored in the storage unit 38. Further, the operator selects the "PTT" button while using the operation unit 32 to input voice to the microphone 30 of FIG. The microphone 30 outputs voice information to the generation unit 36.

Since the option of "area designation (previous)" is not selected, the generation unit 36 generates the area information indicating the second area 202 to which the voice information is received. Further, the generation unit 36 generates identification information, for example, ID "2", which is associated with the area information in which the second area 202 is indicated and the second timing "11:00" in which the area information should be transmitted. Further, the generation unit 36 generates the first combination including the area information, the identification information, and the voice information. Return to FIG. The generation unit 36 outputs the first combination to the transmission unit 40, and stores the contents of the first combination in the storage unit 38.

The storage unit 38 stores the contents of the first combination in response to an instruction from the generation unit 36. In FIG. 6, at the second timing “11:00”, the information included in the line of the message number “2” is stored. The transmission unit 40 receives the first combination from the generation unit 36. The transmission unit 40 transmits the first combination to the base station apparatus 14 via a network 12 (not shown). Again, the format shown in FIG. 7 (a) is used.

Further, following these, the screen displayed at "12:00", which is the third timing of FIG. 3, is shown in FIG. FIG. 9 shows yet another transmission control screen displayed on the display unit 34. At the third timing, it is assumed that the voice information is received by the terminal device 16 located in the first area 200 at “10:00” in FIG. That is, the first area 200 and the second area 202 at the third timing are not targeted for reception. The operator selects "first area (10:00)" as the reception target area while using the operation unit 32. In the "area designation (previous)", an option "second area (11:00)" is additionally displayed according to the transmission at the second timing. Here, too, the display of "area designation (previous)" is made based on the table stored in the storage unit 38. Further, the operator selects the "PTT" button while using the operation unit 32 to input voice to the microphone 30 of FIG. The microphone 30 outputs voice information to the generation unit 36.

The generation unit 36 does not generate the area information because the option of "area designation (previous)" is selected. Instead, the generation unit 36 acquires the ID "1" which is the identification information in the first combination at the first timing from the table stored in the storage unit 38. In addition, the generation unit 36 generates a second combination that includes identification information and voice information and does not include area information. Return to FIG. The generation unit 36 outputs the second combination to the transmission unit 40, and stores the contents of the second combination in the storage unit 38.

The transmission unit 40 receives the second combination from the generation unit 36. The transmission unit 40 transmits the second combination to the base station apparatus 14 via a network 12 (not shown). The format of the second combination is shown in FIG. 7 (b). Here, "identification information" and "voice information" are included. The base station apparatus 14 broadcasts the second combination as well as the first combination.

This configuration can be realized by the CPU, memory, or other LSI of any computer in terms of hardware, and by programs loaded in memory in terms of software, but here it is realized by cooperation between them. It depicts a functional block to be done. Therefore, it will be understood by those skilled in the art that these functional blocks can be realized in various ways by hardware only, software only, or a combination thereof.

FIG. 10 shows the configuration of the terminal device 16. The terminal device 16 includes a receiving device 50. The receiving device 50 includes a receiving unit 60, a positioning unit 62, a holding unit 64, a processing unit 66, and a speaker 68. Further, the receiving unit 60 includes a first receiving unit 70 and a second receiving unit 72. The terminal device 16 may include a function other than the receiving device 50, for example, a transmitting function, but the description thereof will be omitted here.

The receiving unit 60 is compatible with commercial radio and receives a signal from the command station 10 via the base station device 14. The signal is the first combination or the second combination described above. When the signal received by the receiving unit 60 includes area information, the first receiving unit 70 acquires the first combination. As described above, the first combination includes area information, identification information, and voice information. The first receiving unit 70 outputs the first combination to the holding unit 64 and the processing unit 66.

The positioning unit 62 positions the terminal device 16 by receiving a signal from a GPS (Global Positioning System) satellite. Since a known technique may be used for positioning the position, the description thereof is omitted here, but the position is indicated by latitude and longitude. The positioning unit 62 periodically positions the position. The positioning unit 62 sequentially outputs the positioned position as position information to the holding unit 64.

The holding unit 64 receives the position information from the positioning unit 62 and also receives the first combination from the first receiving unit 70. When the position information is included in the area indicated by the area information in the first combination, the holding unit 64 holds the identification information in the first combination and notifies the processing unit 66 that it is located in the area. .. On the other hand, when the position information is not included in the area indicated by the area information in the first combination, the holding unit 64 discards the first combination.

In the case of "10:00" which is the first timing in FIG. 3, as described above, the area information in the first combination indicates the first area 200. Further, the first terminal device 16a and the second terminal device 16b are located in the first area 200, and the third terminal device 16c is located in the second area 202. Therefore, the holding unit 64 of the first terminal device 16a and the second terminal device 16b holds the ID "1" which is the identification information. On the other hand, the holding unit 64 of the third terminal device 16c does not hold the ID "1" which is the identification information.

The processing unit 66 receives the first combination from the first receiving unit 70. When the processing unit 66 receives the notification from the holding unit 64, the processing unit 66 processes, that is, reproduces the voice information in the first combination. The processing unit 66 outputs the reproduced voice information as voice from the speaker 68. On the other hand, when the processing unit 66 does not receive the notification from the holding unit 64, the processing unit 66 discards the voice information. In the case of "10:00", which is the first timing in FIG. 3, the speakers 68 of the first terminal device 16a and the second terminal device 16b output sound, but the speaker 68 of the third terminal device 16c does not output sound. ..

In the case of the second timing "11:00" in FIG. 3, as described above, the area information in the first combination indicates the second area 202. Further, the first terminal device 16a and the third terminal device 16c are located in the first area 200, and the second terminal device 16b is located in the second area 202. Therefore, the holding unit 64 of the first terminal device 16a and the third terminal device 16c does not hold the ID "2" which is the identification information. On the other hand, the holding unit 64 of the second terminal device 16b holds the ID "2" which is the identification information. Here, the holding unit 64 of the second terminal device 16b holds the ID "1" and the ID "2". Further, the speaker 68 of the first terminal device 16a and the third terminal device 16c does not output sound, but the speaker 68 of the second terminal device 16b outputs sound.

If the signal received by the receiving unit 60 does not include the area information at the timing after the timing associated with the identification information in the first combination, the second receiving unit 72 acquires the second combination. As described above, the second combination includes identification information and voice information, but does not include area information. The second receiving unit 72 outputs the second combination to the processing unit 66.

The processing unit 66 receives the second combination from the second receiving unit 72. When the identification information in the second combination and any of the identification information held in the holding unit 64 match, the processing unit 66 reproduces the audio information in the second combination. The processing unit 66 outputs the reproduced voice information as voice from the speaker 68. On the other hand, if they do not match, the processing unit 66 discards the voice information.

In the case of "12:00", which is the third timing in FIG. 3, the identification information in the second combination is ID "1" as described above. Further, the holding unit 64 of the first terminal device 16a holds the ID "1", the holding unit 64 of the second terminal device 16b holds the ID "1" and the ID "2", and holds the third terminal device 16c. Part 64 does not hold the identification information. Therefore, the speaker 68 of the first terminal device 16a and the second terminal device 16b outputs sound, but the speaker 68 of the third terminal device 16c does not output sound. In FIG. 3, the first terminal device 16a to the third terminal device 16c are located in the first area 200 or the second area 202, but even if they are not located in the first area 200 or the second area 202, If it is located within the communicable range 204, the same operation as above is performed.

The second combination may include a plurality of identification information. The format of the second combination in this case is shown in FIG. 7 (c). Here, "identification information 1", "identification information 2", and "voice information" are included. "Identification information 1" and "identification information 2" indicate IDs different from each other. When any of the identification information in the second combination and any of the identification information held in the holding unit 64 match, the processing unit 66 of the terminal device 16 reproduces the voice information in the second combination.

The operation of the communication system 100 with the above configuration will be described. FIG. 11 is a flowchart showing a transmission procedure by the transmission device 20. A transmission control operation is performed by the user via the operation unit 32 (S10). If the "area designation (current)" option is selected (Y in S12), the generation unit 36 issues an ID associated with the target area and the time and stores it in the storage unit 38 (S14). The transmission unit 40 transmits the area information, the ID, and the voice information (S16). If the "area designation (current)" option is not selected (N in S12), the generation unit 36 extracts the ID corresponding to the option (S18). The transmission unit 40 transmits the ID and voice information (S20).

FIG. 12 is a flowchart showing a reception procedure by the receiving device 50. When the received signal is the first combination (Y in S50), if the current position is inside the area (Y in S52), the processing unit 66 outputs voice (S54), and the holding unit 64 outputs an ID. Save (S56). If the current position is not inside the area (N in S52), steps 54 and 56 are skipped. If the received signals are not the first combination (N in S50) and the IDs match (Y in S58), the processing unit 66 outputs voice (S60). If the IDs do not match (N in S58), step 60 is skipped.

According to this embodiment, since the area information and the identification information are included in the first combination, the identification information corresponding to the area information can be notified. Further, since the second combination including the identification information and the voice information is transmitted after the first combination is transmitted, the voice is sent to the terminal device that has notified the identification information at the timing when the first combination is transmitted. Information can be sent. As a result, voice information can be transmitted to a terminal device that has existed in a predetermined area in the past. Further, since the voice information is included in the first combination, the voice information can also be transmitted at the timing of transmitting the first combination. Further, at the timing when time has passed since the information was transmitted from the command station to the terminal device in the target area, the information can be transmitted again to the terminal device that was the reception target at the timing when the information was transmitted.

When the first combination is received, if it is located in the area indicated by the area information in the first combination, the identification information in the first combination is retained, so that the identification information can be acquired. Further, when the second combination is received, when the identification information in the second combination and the retained identification information match, the voice information in the second combination is processed, so that only the terminal device holding the identification information is used. Can output audio. Further, since the first combination also includes the voice information, the voice information can be processed even when the first combination is received.
(Example 2)
Next, Example 2 will be described. The second embodiment relates to a communication system for transmitting voice information by designating an area as in the first embodiment. Further, the second embodiment also relates to transmitting voice information to a terminal device located in a predetermined area in the past. In the first embodiment, after the first combination including the area information, the identification information, and the voice information is transmitted, the second combination including the identification information and the voice information is transmitted. That is, the identification information is notified to the terminal device by transmitting the first combination at the timing when the voice information is generated. On the other hand, in the second embodiment, it is also an object to notify the terminal device of the identification information even when the voice information is not generated. The command station in Example 2 does not include voice information in the first combination. Therefore, the command station periodically transmits, for example, the first combination. The communication system 100, the command station 10, and the terminal device 16 according to the second embodiment are of the same type as those in FIGS. 1, 4, and 10. Here, the differences from the past will be mainly described.

The generation unit 36 of FIG. 4 receives an area selection instruction from the operation unit 32 by the operation of the operator as before. The generation unit 36 generates area information indicating the received area. In addition, the generation unit 36 generates identification information in which the area information indicating the area is associated with the first timing in which the area information should be transmitted. Further, the generation unit 36 generates the first combination including the area information and the identification information. As mentioned above, the first combination does not include voice information. The generation unit 36 outputs the first combination to the transmission unit 40, and stores the contents of the first combination in the storage unit 38. The generation unit 36 does not have to receive the area selection instruction from the operation unit 32 by the operation of the operator, and may periodically and automatically generate the area selection instruction. Since the processing following this is the same as before, it is omitted.

13 (a)-(b) show the format of the signal transmitted from the transmission unit 40 according to the second embodiment of the present invention. FIG. 13A shows the format of the first combination. As shown in the figure, "area information" and "identification information" are included, but voice information is not included. FIG. 13B shows the format of the second combination. This is the same as in FIG. 7 (b).

On the other hand, even if the processing unit 66 of FIG. 10 receives the first combination, the processing unit 66 does not reproduce the voice information because the voice information is not included in the first combination. Since the processing other than this is the same as before, the description thereof will be omitted.

According to this embodiment, since the voice information is not included in the first combination, the correspondence relationship between the area information and the identification information can be notified even when the voice information is not generated. Further, even when the voice information is not generated, the correspondence relationship between the area information and the identification information is notified, so that the notification frequency can be increased.

The present invention has been described above based on examples. This embodiment is an example, and it is understood by those skilled in the art that various modifications are possible for each of these components and combinations of each processing process, and that such modifications are also within the scope of the present invention. ..

In Examples 1 and 2, a commercial radio is used for the communication system 100. However, the present invention is not limited to this, and for example, a wireless communication system other than the commercial wireless, for example, a mobile communication system may be used. In this case, PTT may be executed in the mobile communication system. According to this modification, the degree of freedom of configuration can be improved.

In the first embodiment, the first combination and the second combination include voice information, and in the second embodiment, the second combination contains voice information. However, the present invention is not limited to this, and for example, character information, image information, and the like may be included instead of voice information. Here, voice information, character information, and image information are collectively referred to as data. According to this modification, the degree of freedom of configuration can be improved.

In the first embodiment, the format of the first combination and the format of the second combination are different, and both can be distinguished by the presence or absence of area information. However, the present invention is not limited to this, and for example, the format of the first combination and the format of the second combination may be common. In this case, the format of the first combination and the format of the second combination may include an identifier for identifying whether the format is the first combination or the second combination. According to this modification, the degree of freedom in the configuration of the format of the first combination and the format of the second combination can be improved.

In Examples 1 and 2, the generation unit 36 issues a new ID when generating the first combination. However, the present invention is not limited to this, and for example, the generation unit 36 may issue a new ID when a certain amount of time has passed since the previous transmission, and may use the immediately preceding ID in other cases. Alternatively, the terminal device 16 periodically transmits area information to the command station 10, and when the command station 10 determines that the terminal device 16 straddles the area, the command station 10 issues a new ID, which is used. In other cases, the immediately preceding ID may be used. According to this modification, the ID can be effectively used.

10 Command station, 12 network, 14 base station device, 16 terminal device, 20 transmitter, 30 microphone, 32 operation unit, 34 display unit, 36 generator, 38 storage unit, 40 transmitter, 50 receiver, 60 receiver , 62 Positioning unit, 64 Holding unit, 66 Processing unit, 68 Speaker, 70 1st receiving unit, 72 2nd receiving unit, 100 Communication system.

Claims (2)

A display unit that displays the area information for which data is to be received as an option, and
(1) Area information indicating the area to be received of the data selected by the display unit, identification information associated with the timing at which the area information should be transmitted, and (2) the area information are included. A generator that generates the combination of 1 and
A transmission unit that transmits the first combination generated in the generation unit, and a transmission unit.
A storage unit for storing the first combination transmitted by the transmission unit is provided.
The display unit additionally displays the identification information in the first combination stored in the storage unit as options.
The generation unit generates a second combination including the identification information selected by the display unit and the data.
The transmission unit is a transmission device characterized in that the second combination generated in the generation unit is transmitted. The transmission device according to claim 1, wherein the generation unit also includes data in the first combination.