Terminal device, wireless communication system

Abstract

To provide a technique for reducing power consumption by simplifying processing for specifying a base station device to be a transmission destination.SOLUTION: A transmission section 222 transmits a signal including first type identification information. A reception section 224 receives a signal from a base station device 100. An extraction section 232 extracts second type identification information from the received signal. A measurement section 234 measures a period from a time when the extraction section 232 extracts the second type identification information. When the second type identification information is extracted in the extraction section 232, the transmission section 222 transmits a signal including the second type identification information. When the period measured in the measurement section 234 exceeds a threshold, the transmission section 222 transmits the signal including the first type identification information.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a communication technology, and in particular to a terminal that executes a connection for communication. equipment, wireless Related to communication systems. [Background technology]

[0002] In a wireless communication system including a base station device and a terminal device, the terminal device searches for a frequency band used by the base station device. That is, the terminal device periodically searches for the base station device in order to identify a destination base station device (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-228483 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since searches should be performed periodically, a process for searching is periodically executed in the terminal device. Such a process reduces power consumption and shortens the operating time of a battery-powered terminal device. Therefore, it is required to simplify the process for identifying the destination base station device in the terminal device.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a technique for reducing power consumption by simplifying the process for identifying a destination base station device. [Means for solving the problem]

[0006] In order to solve the above problems, a terminal device according to an embodiment of the present invention includes a transmitter that transmits a signal including first type identification information for indicating that the destination is an unspecified base station device, a receiver that receives a signal from the base station device, an extractor that extracts second type identification information for identifying the base station device and different from the first type identification information from the signal received by the receiver, and a measuring unit that measures the period after the extractor extracts the second type identification information. When the extractor extracts the second type identification information, the transmitter transmits a signal including the second type identification information, and when the period measured by the measuring unit exceeds a threshold value, the transmitter transmits a signal including the first type identification information.

[0008] Yet another aspect of the present invention is a wireless communication system. The wireless communication system includes a terminal device and a base station device. The terminal device includes a transmitter that transmits a signal including first type identification information for indicating that the destination is an unspecified base station device, a receiver that receives a signal from the base station device, an extractor that extracts second type identification information, which is second type identification information for identifying the base station device and is different from the first type identification information, from the signal received by the receiver, and a measuring unit that measures a period from when the extractor extracts the second type identification information. When the extractor extracts the second type identification information, the transmitter transmits a signal including the second type identification information, and when the period measured by the measuring unit exceeds a threshold value, the transmitter transmits a signal including the first type identification information. The base station device includes a receiver that receives a signal from the terminal device, an output unit that outputs information included in the signal when the signal received by the receiver includes the first type identification information or the second type identification information, and a transmitter that transmits a signal including the second type identification information.

[0009] Any combination of the above components, and any transformation of the present invention into a method, device, system, recording medium, computer program, etc., are also effective as aspects of the present invention. Effect of the Invention

[0010] According to the present invention, power consumption can be reduced by simplifying the process for identifying a destination base station device. [Brief description of the drawings]

[0011] [Figure 1] 1(a) to (d) are diagrams showing the configuration of a wireless communication system to be compared with this embodiment. [Diagram 2] 2(a) and 2(b) are diagrams illustrating a configuration of a wireless communication system according to this embodiment. [Diagram 3] FIG. 3 is a diagram illustrating a configuration of the wireless communication system of FIGS. [Figure 4] 4 is a flowchart showing a transmission procedure by the terminal device of FIG. 3. [Diagram 5] 5(a) and (b) are diagrams illustrating an outline of the operation of a first application example of the wireless communication system. [Figure 6] 6(a) and 6(b) are diagrams illustrating an outline of the operation of the second application example of the wireless communication system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Before describing the present invention in detail, an overview will be given first. An embodiment of the present invention relates to a wireless communication system including a base station device and a terminal device. When communicating between multiple terminal devices, a base station device is used to extend the communication distance. Furthermore, in order to extend the communication distance, multiple base station devices are deployed and connected by a network. At this time, in consideration of the convenience of the terminal device, for example, not having to perform operations such as frequency change no matter where it is, the same frequency is used for the multiple base station devices. As a result, simultaneous access may occur.

[0013] In order to suppress the occurrence of simultaneous access, for example, a trunking method is used. In the trunking method, the terminal device always accesses the control station before moving to an open channel. However, when the trunking method is implemented, the number of frequencies used increases and the cost of the system also increases.

[0014] On the other hand, in order to suppress the occurrence of simultaneous access while using one frequency, the beacon method is used. In the beacon method, when a beacon is transmitted from a base station device, a terminal device receives the signal by scanning and selects and uses a base station device with a high signal strength. In this case, the terminal device specifies the destination base station device (obtains identification information for identifying the base station device), and then transmits a signal by adding the obtained identification information. Although the beacon method can be realized with a simpler configuration than the trunking method, the terminal device must constantly receive a beacon from the base station device, so power consumption increases and the battery driving time becomes shorter. In addition, in order to suppress the occurrence of simultaneous access while using one frequency, it is also possible to utilize the arrangement of the base station device and the directivity of the antenna. However, simultaneous access may occur depending on the location of the terminal device, or due to the weather conditions (snowfall, rainfall, etc.) around the base station device.

[0015] In order to simplify the process for identifying the base station device of the transmission destination, the terminal device according to this embodiment transmits a signal addressed to an unspecified base station device without performing a search for identifying the base station device. In response to this transmission, the base station device transmits identification information of the own station to the terminal device. The terminal device acquires the identification information included in the signal received from the base station device. Thereafter, the terminal device executes transmission to the base station device using the acquired identification information. Here, as a result of the movement of a user holding the terminal device, the terminal device may move out of the communication area of ​​the base station device (hereinafter referred to as the "first base station device") and into the communication area of ​​another base station device (hereinafter referred to as the "second base station device"). In this case, in order to prevent the terminal device from continuing to transmit a signal to the first base station device, the terminal device sets a time limit and returns the destination base station device to an unspecified state.

[0016] 1(a)-(d) show the configuration of a wireless communication system 2000 to be compared. The wireless communication system 2000 in FIG. 1(a) includes a first base station device 2100a and a second base station device 2100b collectively referred to as a base station device 2100, and a first terminal device 2200a and a second terminal device 2200b collectively referred to as a terminal device 2200. The number of base station devices 2100 and the number of terminal devices 2200 included in the wireless communication system 2000 are not limited to "2". The first base station device 2100a and the second base station device 2100b are connected by a network not shown.

[0017] An area in which communication with the first base station device 2100a is possible is indicated as a first communication area 2110a, and an area in which communication with the second base station device 2100b is possible is indicated as a second communication area 2110b. Here, the first base station device 2100a and the second base station device 2100b are arranged so that the first communication area 2110a and the second communication area 2110b do not overlap. A first terminal device 2200a and a second terminal device 2200b exist within the first communication area 2110a, and the first terminal device 2200a transmits a signal to the first base station device 2100a, and the second terminal device 2200b receives a signal from the first base station device 2100a.

[0018] The wireless communication system 2000 in FIG. 1(b) is similar to that in FIG. 1(a), but the first base station device 2100a and the second base station device 2100b are arranged so that the first communication area 2110a and the second communication area 2110b overlap. A signal transmitted from the first terminal device 2200a is received by the first base station device 2100a and the second base station device 2100b. The first base station device 2100a and the second base station device 2100b transmit signals. The second terminal device 2200b receives the signal from the first base station device 2100a, and is therefore capable of communicating with the first terminal device 2200a. The third terminal device 2200c receives the signal from the first base station device 2100a and the signal from the second base station device 2100b. If the wireless communication system 2000 is a digital wireless communication system, a congestion state occurs in the third terminal device 2200c, and the signal is not demodulated. On the other hand, if the wireless communication system 2000 is an analog wireless communication system, the stronger signal will be heard in an interference state at the third terminal device 2200c. In the following description, it is assumed that the wireless communication system 2000 is a digital wireless communication system.

[0019] FIG. 1(c) shows an outline of an operation for preventing congestion that may occur in the third terminal device 2200c in FIG. 1(b). The first base station device 2100a and the second base station device 2100b intermittently transmit a signal including their own identification information (hereinafter, referred to as "base station ID"). The base station ID of the first base station device 2100a is different from the base station ID of the second base station device 2100b. The first terminal device 2200a receives a signal from the first base station device 2100a and a signal from the second base station device 2100b, and selects the base station device 2100 that transmitted the signal with the stronger signal strength. This corresponds to selecting the base station ID of the base station device 2100 that transmitted the signal with the stronger signal strength.

[0020] FIG. 1(d) is a process following FIG. 1(c). In FIG. 1(c), the first terminal device 2200a selects the base station ID of the first base station device 2100a. The first terminal device 2200a transmits a signal including the base station ID of the first base station device 2100a. The first base station device 2100a transmits the signal since the received signal includes the base station ID of the own station. Therefore, the second terminal device 2200b and the third terminal device 2200c receive signals from the first base station device 2100a. On the other hand, the second base station device 2100b does not transmit the signal since the received signal does not include the base station ID of the own station. As a result of such processing, congestion does not occur in the third terminal device 2200c. However, the base station device 2100 must transmit signals intermittently, and the terminal device 2200 must always perform a receiving operation. The power consumption of the terminal device 2200 increases, and the battery life of the terminal device 2200 becomes shorter.

[0021] 2(a)-(b) show the configuration of a wireless communication system 1000. The wireless communication system 1000 in FIG. 2(a) includes a first base station device 100a and a second base station device 100b collectively referred to as a base station device 100, and a first terminal device 200a, a second terminal device 200b, and a third terminal device 200c collectively referred to as a terminal device 200. The number of base station devices 100 included in the wireless communication system 1000 is not limited to "2", and the number of terminal devices 200 is not limited to "3". The first base station device 100a and the second base station device 100b are connected by a network (not shown).

[0022] An area in which communication with the first base station device 100a is possible is indicated as a first communication area 110a, and an area in which communication with the second base station device 100b is possible is indicated as a second communication area 110b. Here, the first base station device 100a and the second base station device 100b are arranged so that the first communication area 110a and the second communication area 110b overlap. The first terminal device 200a is located in a position that is within the first communication area 110a and outside the second communication area 110b. When the destination base station device 100 is not determined, the first terminal device 200a transmits a signal including a base station ID (hereinafter, also referred to as "first type identification information") for indicating that the destination is an unspecified base station device. The first type identification information is, for example, "Null". This corresponds to transmitting a signal to an unspecified base station device 100. The addresses of the second terminal device 200b and the third terminal device 200c, which are the final destinations of the signal, are also included in the signal. The signal from the first terminal device 200a is received by the first base station device 100a.

[0023] When the first base station device 100a receives a signal from the first terminal device 200a and the received signal includes first type identification information, the first base station device 100a transmits a signal including its own base station ID to the first terminal device 200a. The own base station ID is identification information for identifying the base station device 100, and may be called "second type identification information." In addition, the first base station device 100a transmits the signal received from the first base station device 100a to the second terminal device 200b and the third terminal device 200c. The second terminal device 200b and the third terminal device 200c receive the signal from the first base station device 100a.

[0024] When the first terminal device 200a receives a signal from the first base station device 100a, it acquires the base station ID of the first base station device 100a. Subsequently, the first terminal device 200a transmits a signal including the base station ID of the first base station device 100a. At that time, the address of the second terminal device 200b and the third terminal device 200c, which are the final destinations of the signal, are also included in the signal. This corresponds to transmitting a signal to the first base station device 100a.

[0025] When the first base station device 100a receives a signal from the first terminal device 200a and the received signal includes first type identification information, the first base station device 100a transmits the signal received from the first terminal device 200a to the second terminal device 200b and the third terminal device 200c. The second terminal device 200b and the third terminal device 200c receive the signal from the first base station device 100a.

[0026] FIG. 2(b) shows the process following FIG. 2(a). The first terminal device 200a is located in a position included in the first communication area 110a and the second communication area 110b. The first terminal device 200a transmits a signal including the base station ID of the first base station device 100a. At that time, the signal also includes the addresses of the second terminal device 200b and the third terminal device 200c, which are the final destinations of the signal. When the first base station device 100a receives a signal from the first terminal device 200a and the received signal includes the base station ID of the first base station device 100a, the first base station device 100a executes the same process as before. On the other hand, when the second base station device 100b receives a signal from the first terminal device 200a and the received signal includes the base station ID of the first base station device 100a, the second base station device 100b does not execute the process since the base station ID of the first base station device 100a is different from the base station ID of the first base station device 100a. As a result, the signal from the first terminal device 200a is processed in the first base station device 100a, and is not processed in the second base station device 100b.

[0027] 3 shows a configuration of a wireless communication system 1000. The base station device 100 includes a wireless communication unit 120, a processing unit 130, a storage unit 140, and a wired communication unit 150, the wireless communication unit 120 includes a transmission unit 122 and a reception unit 124, and the processing unit 130 includes an output unit 132. The terminal device 200 includes a wireless communication unit 220, a processing unit 230, and a storage unit 240, the wireless communication unit 220 includes a transmission unit 222 and a reception unit 224, and the processing unit 230 includes an extraction unit 232 and a measurement unit 234.

[0028] The storage unit 240 of the terminal device 200 stores first type identification information, for example, Null, for indicating that the destination is an unspecified base station device 100. The processing unit 230 acquires the first type identification information from the storage unit 240 at the timing of transmitting a signal, and generates a signal including the first type identification information. At that time, the processing unit 230 also includes in the signal the address of the other terminal device 200 that is the final destination of the signal. The transmission unit 222 transmits the signal generated in the processing unit 230. This corresponds to transmitting a signal to unspecified base station devices 100.

[0029] The receiving unit 124 of the base station device 100 receives a signal from the terminal device 200. The processing unit 130 determines whether or not the signal received by the receiving unit 124 includes first type identification information or the base station ID of the own station. The base station ID of the own station is stored in the storage unit 140 and corresponds to the above-mentioned second type identification information. If the signal includes the first type identification information, the processing unit 130 generates a signal including the base station ID of the own station, and the transmitting unit 122 transmits the signal to the terminal device 200. If the signal includes the first type identification information, the output unit 132 outputs the information included in the signal. Here, the transmitting unit 122 transfers the signal to another terminal device 200 that is the final destination. Also, the wired communication unit 150 may transmit a signal to another base station device 100.

[0030] The receiving unit 224 of the terminal device 200 receives a signal from the base station device 100. The extracting unit 232 extracts the base station ID of the base station device 100 from the received signal as second type identification information. The extracting unit 232 stores the extracted base station ID in the storage unit 240. The measuring unit 234 measures the period from when the extracting unit 232 extracted the base station ID. The processing unit 230 acquires the base station ID from the storage unit 240 at the timing of transmitting the signal, and generates a signal including the base station ID. That is, the base station ID is used instead of the first type identification information. At that time, the processing unit 230 also includes the address of the other terminal device 200 that is the final destination of the signal in the signal. The transmitting unit 222 transmits the signal generated in the processing unit 230.

[0031] The receiving unit 124 of the base station device 100 receives a signal from the terminal device 200. The processing unit 130 determines whether or not the signal received by the receiving unit 124 includes first type identification information or the base station ID of the own station. If the signal includes the base station ID of the own station, the output unit 132 outputs the information included in the signal. Here, the transmitting unit 122 transfers the signal to another terminal device 200 that is the final destination. Also, the wired communication unit 150 may transmit the signal to another base station device 100.

[0032] When the base station device 100 should transmit a signal to the terminal device 200, the processing unit 130 includes its own base station ID in the signal, and the transmission unit 122 transmits the signal to the terminal device 200. The receiving unit 224 of the terminal device 200 receives the signal from the base station device 100. The extraction unit 232 extracts the base station ID of the base station device 100 from the received signal. When the measurement unit 234 is measuring a period and the extraction unit 232 extracts the base station ID, the measurement unit 234 resets the period and continues measuring the period. Furthermore, the processing unit 230 processes the received signal.

[0033] When the period measured by the measuring unit 234 exceeds the threshold, the processing unit 230 of the terminal device 200 deletes the base station ID stored in the storage unit 240. In this situation, when generating a signal, the processing unit 230 includes the first type identification information in place of the base station ID in the signal. Therefore, the terminal device 200 returns to the process of transmitting a signal to unspecified base station devices 100.

[0034] This configuration can be realized in hardware terms by the CPU, memory, and other LSIs of any computer, and in software terms by programs loaded into memory, but here we depict functional blocks realized by the cooperation of these. Therefore, it will be understood by those skilled in the art that these functional blocks can be realized in various forms by hardware alone, software alone, or a combination of both.

[0035] The operation of the wireless communication system 1000 with the above configuration will be described. FIG. 4 is a flowchart showing a transmission procedure by the terminal device 200. The transmission unit 222 transmits a signal with Null set (S10). The reception unit 224 receives a signal from the base station device 100 (S12). The extraction unit 232 extracts the base station ID from the signal (S14). The measurement unit 234 starts measurement (S16). The transmission unit 222 transmits a signal with the base station ID set (S18). If the reception unit 224 receives a signal from the base station device 100 (Y of S20), the process returns to step 14. If the reception unit 224 does not receive a signal from the base station device 100 (N of S20), or if the measured period has not expired (N of S22), the process returns to step 20. If the measured period has expired (Y of S22), the transmission unit 222 transmits a signal with Null set (S24).

[0036] In the following, application examples of the embodiments described above will be described. FIG. 5(a)-(b) shows an outline of the operation of a first application example of the wireless communication system 1000. FIG. 5(a) shows the operation of a wireless communication system 2000 to be compared. The wireless communication system 2000 is used for communication within a building 2300. A first base station device 2100a is installed on the 4th floor, a second base station device 2100b is installed on the 1st floor, and the first base station device 2100a and the second base station device 2100b are connected by a network (not shown). A first communication area 2110a covers the 3rd floor to the 5th floor, and a second communication area 2110b covers the B2F to the 2nd floor. However, in reality, the first communication area 2110a and the second communication area 2110b partially overlap each other.

[0037] If the first base station device 2100a and the second base station device 2100b use the same frequency, congestion may occur as the terminal device 2200 accesses both base station devices 2100. In order to suppress the occurrence of congestion, different frequencies are set for the first base station device 2100a and the second base station device 2100b. When a user who uses the terminal device 2200 moves from 3F to 2F, the user must change the frequency set for the terminal device 2200.

[0038] FIG. 5(b) shows the operation of the wireless communication system 1000 of this embodiment. The wireless communication system 1000 is used for communication within a building 300. The first base station device 100a is installed on the 4th floor, the second base station device 100b is installed on the 1st floor, and the first base station device 100a and the second base station device 100b are connected by a network (not shown). The first communication area 110a covers the 3rd floor to the 5th floor, and the second communication area 110b covers the B2nd floor to the 2nd floor. As described above, even if the first base station device 100a and the second base station device 100b use the same frequency, the terminal device 200 accesses only one of the base station devices 100, so congestion does not occur. In addition, when a user who uses the terminal device 200 moves from the 3rd floor to the 2nd floor, the user does not need to change the frequency set in the terminal device 200.

[0039] 6(a)-(b) show an operation overview of a second application example of the wireless communication system 1000. FIG. 6(a) shows an operation of a wireless communication system 2000 to be compared. The wireless communication system 2000 connects a plurality of base station devices 2100 via a relay device 2400 to construct a communication area (not shown). The first base station device 2100a includes a VHF band fixed system base station radio device 2250 and a 350 MHz band fixed system base station radio device 2252, the relay device 2400 includes a 350 MHz band fixed system base station radio device 2450 and a 400 MHz band fixed system base station radio device 2452, and the second base station device 2100b includes a 400 MHz band fixed system base station radio device 2260 and a VHF band fixed system base station radio device 2262.

[0040] In the wireless communication system 2000, the base station devices 2100 are installed so that their communication areas do not overlap. However, due to the influence of seasons and weather conditions, the communication areas of the base station devices 2100 may overlap. The overlapping of the communication areas affects interrupt communication on the control station side. A signal transmitted from the terminal device 2200 is relayed within the communication areas by both the first base station device 2100a and the second base station device 2100b. The relay device 2400 receives signals from both the first base station device 2100a and the second base station device 2100b, and therefore collision occurs.

[0041] In the office, a user listens to the voice contained in the signal received by the first base station device 2100a. At this time, during transmission by the terminal device 2200, the office side may interrupt and transmit a signal. The signal from the office can be received within the communication area of ​​the first base station device 2100a, but the signal from the office does not reach the area of ​​the second base station device 2100b because a collision has occurred at the relay device 2400.

[0042] 6(b) shows the operation of the wireless communication system 1000 of this embodiment. The wireless communication system 1000 connects a plurality of base station devices 100 via relay devices 400 to establish a communication area (not shown). The first base station device 100a includes a VHF band fixed system base station radio device 250 and a 350 MHz band fixed system base station radio device 252, the relay device 400 includes a 350 MHz band fixed system base station radio device 450 and a 400 MHz band fixed system base station radio device 452, and the second base station device 100b includes a 400 MHz band fixed system base station radio device 260 and a VHF band fixed system base station radio device 262.

[0043] The signal transmitted from the terminal device 200 is received only by the second base station device 100b, so it is relayed by the relay device 400 and transmitted from the first base station device 100a. An interrupt transmission from the office is also transmitted from the 350 MHz band fixed system base station radio device 252 of the first base station device 100a, and the relay device 400 receives the signal and performs relay operation. The second base station device 100b receives the signal from the relay device 400 and transmits it.

[0044] According to this embodiment, when a signal is received from a base station device, a signal including second type identification information corresponding to the base station device instead of first type identification information is transmitted, so that scanning of signals from the base station device is not required. Furthermore, since scanning of signals from the base station device is not required, processing for identifying a destination base station device can be simplified. Furthermore, since scanning of signals from the base station device is not required, a battery saver can be activated. Furthermore, since the battery saver is activated, power consumption can be reduced. Furthermore, since power consumption is reduced, battery drive time can be extended. Furthermore, when the period after the extraction of the second type identification information exceeds a threshold value, a signal including first type identification information instead of second type identification information is transmitted, so that it is possible to switch to another base station device. Furthermore, since the period is being measured and the second type identification information is extracted, the period is reset, so that the usage period of the second type identification information can be extended.

[0045] The present invention has been described above based on the embodiments. These embodiments are merely illustrative, and it will be understood by those skilled in the art that various modifications are possible in the combination of each component and each treatment process, and that such modifications are also within the scope of the present invention.

[0046] In this embodiment, the wireless communication system 1000 is a digital wireless communication system. However, the wireless communication system 1000 is not limited to this, and may be, for example, an analog wireless communication system. The analog wireless communication system is, for example, analog radio, specific low power. In this case, the first type of identification information is a first tone signal, and the second type of identification information is a second tone signal. Also, the first tone signal and the second tone signal are different. According to this modification, the degree of freedom of the configuration can be improved. [Explanation of symbols]

[0047] 100 base station device, 110 communication area, 120 wireless communication unit, 122 transmission unit, 124 reception unit, 130 processing unit, 132 output unit, 140 memory unit, 150 wired communication unit, 200 terminal device, 220 wireless communication unit, 222 transmission unit, 224 reception unit, 230 processing unit, 232 extraction unit, 234 measurement unit, 240 memory unit, 1000 wireless communication system.

Claims

1. a transmitter that transmits a signal including first type identification information for indicating that the destination is an unspecified base station device; A receiving unit that receives a signal from a base station device; an extractor that extracts, from the signal received by the receiver, second type identification information for identifying the base station device, the second type identification information being different from the first type identification information; a measurement unit that measures a period of time since the extraction unit extracted the second type identification information, When the second type identification information is extracted by the extraction unit, the transmission unit transmits a signal including the second type identification information, A terminal device, wherein the transmitting unit transmits a signal including the first type identification information when the period measured by the measuring unit exceeds a threshold value.

2. The terminal device according to claim 1 , wherein the measurement unit resets the period when the extraction unit extracts the second type identification information.

3. the first type identification information is a first tone signal, the second type identification information is a second tone signal, 3. The terminal device according to claim 1, wherein the first tone signal and the second tone signal are different from each other.

4. A terminal device and a base station device are provided. The terminal device a transmitter that transmits a signal including first type identification information for indicating that the destination is an unspecified base station device; A receiving unit that receives a signal from the base station device; an extractor that extracts, from the signal received by the receiver, second type identification information for identifying the base station device, the second type identification information being different from the first type identification information; a measurement unit that measures a period of time since the extraction unit extracted the second type identification information, When the second type identification information is extracted by the extraction unit, the transmission unit transmits a signal including the second type identification information, When the period measured by the measuring unit exceeds a threshold value, the transmitting unit transmits a signal including the first type identification information, The base station device, A receiving unit that receives a signal from the terminal device; an output unit that outputs information included in a signal when the signal received by the receiving unit includes the first type identification information or the second type identification information; A transmitter that transmits a signal including the second type identification information; A wireless communication system comprising:

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