JP6873943B2 - Terminal equipment, base station equipment, control methods, and programs that enable location registration processing during sleep mode. - Google Patents

Description

The present invention relates to a location registration technique in a cellular communication system of a terminal device.

An important issue in wireless communication systems is power saving of terminal devices. On the other hand, Non-Patent Document 1 describes a configuration in which a sleeping terminal device is activated when a wake-up signal transmitted from the network side is detected by using a passive circuit. The terminal device turns off the power of the RF (Radio Frequency) circuit and the baseband circuit during sleep. In the configuration as in Non-Patent Document 1, the power of the RF circuit and the BB circuit of the terminal device is not turned on unless the wakeup signal is transmitted from the network side. Therefore, the power consumption of the terminal device can be further reduced as compared with the conventional power saving operation that is started at regular intervals.

3GPP Contribution, RP-172373, December 2017

In a mobile wireless communication system such as LTE (Long Term Evolution), location registration is performed so that the network side can recognize the position of each terminal device in order to enable a call to a moving terminal device. Conventionally, a terminal device is activated at regular intervals to receive a control signal, and transmits a location registration request to a network, for example, when moving across a tracking area (TA). On the other hand, as described in Non-Patent Document 1, when the terminal device does not start unless it receives a wake-up signal, the terminal device in the non-started state moves across the TA, but the TA does not start. It is possible that the change in the location cannot be recognized and the location registration request cannot be sent. Therefore, in the network, the position of the terminal device cannot be specified, and the terminal device may not be called.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for reliably executing location registration while suppressing power consumption of a terminal device.

The terminal device according to one aspect of the present invention is a first communication means for performing wireless communication in a cellular communication system using the power supply of the terminal device, and a wireless signal transmitted from the base station device is used as the power of the wireless signal. When the information about the area of the base station device included in the radio signal satisfies a predetermined condition regarding the location registration, or the data addressed to the terminal device exists. When the wireless signal indicates , the first communication means is activated, and the wireless signal indicates that the information regarding the area does not satisfy the predetermined condition regarding the location registration and that the data addressed to the terminal device exists. Does not indicate, the first communication means has a second communication means that does not activate the first communication means, and the first communication means is activated when a predetermined condition regarding the location registration is satisfied. It is characterized by executing a process for registering a location.

The base station apparatus according to one aspect of the present invention transmits a radio signal received by the second communication means of the terminal device capable of activating the first communication means of the terminal device for wireless communication in the cellular communication system. has a transmitting unit, a second communication unit of the terminal device the receives the radio signal by using the power of the radio signal, the transmission unit, information including Mutotomoni the terminal area of the base station apparatus When the data addressed to the device exists, the radio signal indicating that the data exists is transmitted, and the radio signal includes information about the area of the base station device included in the radio signal, which is predetermined for location registration. When the wireless signal indicates that the data addressed to the terminal device exists, the terminal device activates the first communication means, and the information about the area included in the wireless signal is transmitted. When the radio signal does not indicate that the predetermined condition regarding the location registration is not satisfied and the data addressed to the terminal device exists, the terminal device is prevented from activating the first communication means. to, characterized in that.

According to the present invention, location registration can be reliably executed while suppressing the power consumption of the terminal device.

The figure which shows the configuration example of a wireless communication system. The figure which shows the hardware configuration example of a device. The figure which shows the functional configuration example of a base station apparatus. The figure which shows the functional configuration example of a terminal device. The figure which shows the 1st example of the flow of processing executed in a wireless communication system. The figure which shows the 2nd example of the process flow executed in a wireless communication system. The figure which shows the 3rd example of the process flow executed in a wireless communication system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(System configuration)
FIG. 1 shows a configuration example of the wireless communication system according to the present embodiment. The wireless communication system according to the present embodiment is a cellular communication system, but any wireless communication system that requires location registration of the terminal device can be adopted. The wireless communication system includes a base station device 101 and a terminal device 102. Although FIG. 1 shows an example of a system including three base station devices 101 and one terminal device 102, in general, a large number of base station devices 101 and a large number of terminal devices 102 are included in the system. .. The base station device 101 forms one or more areas, and can perform wireless communication with the terminal device 102 existing in the area. The position registration of the terminal device 102 is executed, for example, when the power of the terminal device 102 is turned on or when the terminal device 102 moves across the tracking area whose area edge is represented by the boundary 103. ..

In the present embodiment, the terminal device 102 can shift to a sleep state in which the power of the RF (Radio Frequency) circuit and the baseband circuit is turned off in order to save power. During sleep, the terminal device 102 listens for a wake-up signal transmitted from the base station device 101 (network) by using a communication circuit driven by the power of the wake-up signal. Then, the terminal device 102 activates an RF circuit or a baseband circuit for wireless communication using the power supply of the terminal device 102 itself based on the wake-up signal. If the terminal device 102 moves across the boundary 103 of the tracking area in the sleep state, the position registration process is not executed at that time, so that the position of the terminal device 102 may not be captured on the network side.

Therefore, in the present embodiment, the base station device 101 uses the area of the base station device 101 as a wake-up signal that can activate the terminal device 102, in addition to a signal indicating that transmission data to the terminal device 102 exists. A signal containing (position) information is transmitted. Then, the terminal device 102 receives a wake-up signal including information on the area of the base station device 101, and when the information satisfies a predetermined condition regarding location registration, the RF circuit or an RF circuit driven by the power supply of the own device Start the baseband circuit. Then, when the information in the area of the base station device 101 satisfies a predetermined condition regarding the position registration and activates the communication circuit driven by the power supply of the own device, the terminal device 102 uses the communication circuit to perform the position registration. Executes the processing of. The terminal device 102 does not satisfy the predetermined conditions for location registration in the area information of the base station device 101, but the power supply of the terminal device 102 is caused by a wake-up signal caused by, for example, the existence of data addressed to the terminal device 102. When the communication circuit driven by is started, it is not necessary to execute the process for registering the location.

For example, the terminal device 102 determines that a predetermined condition regarding location registration is satisfied in response to a change in information in the area of the base station device 101, activates a communication circuit driven by the power supply of the own device, and positions the position. A predetermined process for registration can be performed. The terminal device 102 may hold the information on the area of the base station device 101 each time it is determined that the predetermined condition regarding the location registration is satisfied (for example, the information on the area of the base station device 101 changes). Then, the terminal device 102 can determine whether or not the predetermined condition is satisfied depending on whether or not the information in the area of the base station device 101 received thereafter matches the information held.

As processing for location registration, the terminal device 102 receives, for example, a signal capable of confirming the tracking area, and transmits a location registration request to the base station device 101 when the tracking area has changed. To execute. According to this, the terminal device 102 confirms the tracking area by using a communication circuit driven by the power supply of the own device, for example, in response to a change in the information in the area of the base station device 101. Then, the terminal device 102 transmits the location registration request when there is a change in the staying tracking area, and does not transmit the location registration request when there is no change in the staying tracking area. As a result, the terminal device 102 does not move across the tracking area in the sleep state, so that the probability that the network cannot recognize the position of the terminal device 102 can be reduced. The signal whose tracking area can be confirmed may be, for example, a signal including system information. The terminal device 102 can confirm the tracking area by, for example, a signal broadcast from the base station device 101.

Further, a group of one or more cell identifiers may be formed for each tracking area. That is, any of the identifiers belonging to one group may be assigned to the cells belonging to one tracking area. In this case, the terminal device 102 can receive a signal capable of confirming the cell identifier (PCI, Physical Cell ID) as a process for registering the position, and can determine whether or not the group to which the received identifier belongs has changed. Then, the terminal device 102 transmits the location registration request to the base station device 101 when the group to which the identifier of the received cell belongs changes. That is, in a system in which cell identifiers are grouped by tracking area, when the group to which the received identifier belongs changes, it means that the cell identifier has entered a different tracking area area. Therefore, by transmitting the location registration request to the base station device 101 in such a case, the terminal device 102 does not move across the tracking area in the sleep state. The signal from which the cell identifier can be confirmed may be, for example, a synchronization signal.

Further, the base station apparatus 101 may transmit information about the tracking area (for example, tracking area ID (TAI), tracking area code (TAC)) as area information. The terminal device 101 can determine that the predetermined condition regarding the location registration is satisfied when the received information regarding the tracking area changes. Then, the terminal device 101 activates a communication circuit driven by the power supply of its own device in response to the change in the information regarding the received tracking area, and transmits a location registration request by the communication circuit. According to this, since the terminal device 102 does not activate the communication circuit driven by the power supply of the own device while the tracking area does not change, the power consumption of the terminal device 102 can be suppressed to a low level.

The base station device 101 can transmit a wake-up signal including information on the area of the base station device 101 within the system frequency band of the cellular communication system including its own device. Further, the base station apparatus 101 may transmit a wake-up signal including information on the area of the base station apparatus 101 in the frequency band of the guard band of the cellular communication system.

Hereinafter, the configurations of the base station device 101 and the terminal device 102 that execute such processing and an example of the processing flow executed by the wireless communication system will be described.

(Hardware configuration)
FIG. 2 shows a hardware configuration example of the base station device 101 and the terminal device 102. In one example, the base station device 101 and the terminal device 102 have a hardware configuration as shown in FIG. 2, for example, a CPU 201, a ROM 202, a RAM 203, an external storage device 204, a first communication circuit 205, and a second communication circuit. Has 206. In the base station device 101 and the terminal device 102, for example, a program recorded in any of the ROM 202, the RAM 203, and the external storage device 204 that realizes each function of the base station device 101 and the terminal device 102 as described above is executed by the CPU 201. Will be done.

Then, the base station device 101 and the terminal device 102 control the first communication circuit 205 by, for example, the CPU 201, and use the power supply of the own device to perform wireless communication with, for example, another device in the cellular communication system. Further, the second communication circuit 206 of the terminal device 102 is, for example, a passive circuit that can be activated by the power of the radio signal transmitted from the base station device 101. Then, the second communication circuit 206 of the base station device 101 is configured to be able to send a radio signal capable of activating the second communication circuit 206 of the terminal device 102. For example, the terminal device 102 cuts off the power supply to the first communication circuit 205 and shifts to the sleep state while not communicating with the base station device 101. In some cases, the terminal device 102 may cut off the power supply to the CPU 201 and the like during the sleep state. Then, the terminal device 102 activates the second communication circuit 206 with the power of the radio signal transmitted from the base station device 101, and receives the radio signal by the second communication circuit 206. Then, when the second communication circuit 206 of the terminal device 102 determines that the information of the area of the base station device 101 included in the radio signal satisfies a predetermined condition regarding the location registration, for example, to the first communication circuit 205. An instruction signal is output to the CPU 201 so as to supply power. Then, after activating the first communication circuit 205, the terminal device 102 executes the process for location registration using the first communication circuit 205. The second communication circuit 206 of the base station device 101 corresponds to the second communication circuit 206 of the terminal device 102, but operates using the power of the base station device 101. Then, the first communication circuit 205 of the base station apparatus 101 may be configured so as not to shift to the sleep state. The first communication circuit 205 and the second communication circuit 206 of the base station apparatus 101 may be configured by one communication circuit. However, in this case, control is performed so that the transmission of the wireless signal capable of activating the second communication circuit 206 of the terminal device 102 and the transmission / reception of the wireless signal for wireless communication in the cellular communication system can be executed.

The first communication circuit 205 of the base station device 101 may form one or more (plurality) beams and wirelessly communicate with the terminal device 102. Further, in this case, the first communication circuit 205 of the terminal device 102 is wirelessly connected to the base station device 101 via at least one of the beams formed by the first communication circuit 205 of the base station device 101. It is configured to be able to communicate. In the configuration of FIG. 2, the base station device 101 and the terminal device 102 show a schematic diagram in which the first communication circuit 205 and the second communication circuit 206 are provided, but the present invention is not limited to this, and further communication circuits may be provided. You may have. For example, the base station apparatus 101 may further have another communication circuit for communicating with another base station apparatus or another network node through a wired line. Further, the terminal device 102 may separately have, for example, a communication circuit for NR and a communication circuit for LTE (Long Term Evolution). Further, the terminal device 102 may have a communication circuit related to a standard other than cellular such as a wireless LAN, and may further have a communication circuit used for a wired connection such as a USB connection.

The base station device 101 and the terminal device 102 may be provided with dedicated hardware for executing each function, or a part of the base station device 101 and the terminal device 102 may be executed by the hardware and the other parts may be executed by the computer running the program. May be good. Also, all functions may be performed by a computer and a program.

(Functional configuration)
FIG. 3 shows an example of the functional configuration of the base station apparatus 101. The base station device 101 has, for example, a first communication unit 301, a second communication unit 302, and an area information storage unit 303 as its functional configuration. The base station device 101 has a function as a base station device of a general cellular communication system, but detailed description thereof will be omitted here. The first communication unit 301 executes substantive communication such as control communication and data communication in the cellular communication system. The base station device 101 executes wireless communication with the connected terminal device 102 via the first communication unit 301. The second communication unit 302 transmits a radio signal received by the low power consumption communication circuit in the terminal device 102. This wireless signal is, for example, a wireless signal capable of supplying power to a low power consumption communication circuit of the terminal device 102 and activating the communication circuit. The area information storage unit 303 stores information on the area of the base station device 101. The second communication unit 302 transmits a radio signal including the area information of the base station apparatus 101 stored in the area information storage unit 303. Here, the information on the area of the base station device 101 may be information on an area such as a cell formed by the base station device 101, or information on a tracking area. This wireless signal is a substantial wireless communication in a cellular communication system using, for example, an internal power supply when the information in the area of the base station apparatus 101 satisfies a predetermined condition for location registration in the terminal apparatus 102. The communication circuit for is activated. That is, this radio signal is a conditional wakeup signal. The second communication unit 302 may transmit this radio signal within the system frequency band of the cellular communication system, or may transmit this radio signal in the frequency band of the guard band of the cellular communication system.

FIG. 4 shows an example of the functional configuration of the terminal device 102. The terminal device 102 has a first communication unit 401 and a second communication unit 402. The second communication unit 402 includes an area information holding unit 421 and a condition determination unit 422 as its functions, and the first communication unit 401 includes a location registration processing unit 411 as its functions. The first communication unit 401 uses the power supply (not shown) inside the terminal device 102 to execute wireless communication in the cellular communication system. The second communication unit 402 receives the radio signal by using the power of the radio signal from the base station device 101. The second communication unit 402 does not have to use the power of the wireless signal from the base station device 101 as long as it is configured to be able to receive the wireless signal with low power consumption. For example, the second communication unit 402 may be configured to receive a radio signal from the base station device 101 by a power source such as a button battery.

The area information holding unit 421 is at a time when the terminal device 102 is connected to the base station device 101 and acquires information on the area of the base station device 101 via, for example, the first communication unit 401, or the area of the base station device 101. The information of the area of the base station apparatus 101 at the time when it is detected that the information of the above has changed is retained. The condition determination unit 422 combines the area information of the base station device 101 held by the area information holding unit 421 and the area information of the base station device 101 acquired by the radio signal received by the second communication unit 402. Based on this, it is determined whether or not the predetermined conditions for location registration are satisfied. The condition determination unit 422 determines that a predetermined condition is satisfied when, for example, the received information in the area of the base station apparatus 101 is different from the retained information. Further, the condition determination unit 422 is a radio signal transmitted from the base station device 101 in order to specify and activate the terminal device 102, for example, when the base station device 101 holds the data addressed to the terminal device 102. Is received by the second communication unit 402, it can be determined that a predetermined condition for data communication is satisfied. The condition determination unit 422 outputs a signal for activating the first communication unit 401 when it is determined that the predetermined condition is satisfied.

The location registration processing unit 411 executes the processing for location registration when the first communication unit 401 is activated in response to the condition determination unit 422 determining that the predetermined condition for location registration is satisfied. .. The location registration processing unit 411 performs, for example, a process of acquiring tracking area information and a cell identifier from the base station apparatus 101, and a change in the tracking area or a change in the cell identifier group as described above. The location registration request is transmitted to the base station device 101. As a result, when there is a change in the tracking area, location registration is performed via the first communication unit 401. When the area information of the base station apparatus 101 is the tracking area information, the first communication unit 401 transmits a location registration request to the base station apparatus 101 as a process for location registration.

(Processing flow)
Subsequently, an example of the flow of processing executed in the wireless communication system according to the present embodiment will be described. FIG. 5 shows a first processing example. In this processing example, the base station apparatus 101 periodically transmits, for example, a wake-up signal including information on the area of its own apparatus (S501). Here, as described above, the wake-up signal is a wireless signal that can be received by the second communication unit 402 while the terminal device 102 is in the sleep state, and the information in the area of the base station device 101 is a predetermined condition. It is a radio signal that gives a trigger to activate the first communication unit 401 when the condition is satisfied. Further, the wake-up signal may include information for designating the terminal device 102 in which transmission target data exists and should be activated, in addition to the information in the area of the base station device 101. Further, the information in which the transmission target data exists and specifies the terminal device 102 to be activated may be transmitted separately from the wake-up signal such as S501.

After that, for example, when the terminal device 102 moves and enters the area of the base station device 101, the terminal device 102 can receive the wake-up signal including the area information from the base station device 101. (S502). The terminal device 102 can receive the area information from other base station devices until the area information from the base station device 101 is received in S502. The base station device 101 transmits the wake-up signal within the system frequency band of the cellular communication system or in the guard band, so that the terminal device 102 staying in the communicable area of the cellular communication system can receive the wake-up signal. It is possible to reduce the probability that the other terminal devices 102 will receive the wake-up signal.

Here, it is assumed that the terminal device 102 has detected a change in the information in the area received from the base station device 101 (S503). The terminal device 102 releases the sleep state in response to the detection of the information in this area, and shifts to a state in which wireless communication is possible by the first communication unit 401 using the power supply in the own device (S504). Then, the terminal device 102 receives, for example, system information (S505) and acquires information on the tracking area. Then, when the terminal device 102 detects a change in the information in the tracking area (S506), the terminal device 102 transmits a location registration request to the base station device 101 and executes the location registration process (S507). Then, when the terminal device 102 completes the location registration process, the terminal device 102 shifts to the sleep state again (S508).

If the terminal device 102 does not detect a change in the area information received from the base station device 101, the terminal device 102 does not wake up from the sleep state. Further, if the terminal device 102 does not detect a change in the tracking area after returning from the sleep state, the terminal device 102 may shift to the sleep state without executing the location registration process. Further, the terminal device 102 holds the information in response to the reception of the area information from the base station device 101, and can prevent the terminal device 102 from returning from the sleep state while the same information is received. As a result, the terminal device 102 does not unnecessarily wake up from the sleep state, so that power consumption can be suppressed.

FIG. 6 shows a second processing example. The example of FIG. 6 is an example in which the information of the area transmitted by the base station apparatus 101 is the information of the tracking area (TAI or TAC). In this example, the base station apparatus 101 transmits a wake-up signal including information on the tracking area (S601, S602). In this case, since the terminal device 102 can acquire the tracking area information by the wake-up signal, the change in the tracking area can be detected directly from the wake-up signal (S603). The processing after the change in the tracking area is detected is the same as in FIG.

FIG. 7 shows a third processing example. In this processing example, a group of cell identifiers is formed for each tracking area, and an example in which a change in the tracking area can be detected by a change in the group of cell identifiers is shown. The processing of S501 to S504 is the same as that of FIG. After returning from the sleep state, the terminal device 102 receives a synchronization signal (at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) and acquires a cell identifier (PCI) (S701). .. Then, the terminal device 102 detects the change in the tracking area when the acquired cell identifier is not included in the group of the identifiers of the tracking area to which the terminal device 102 has belonged (S702). Subsequent processing is the same as in FIGS. 5 and 6.

Through the above processing, the terminal device 102 can reliably execute the location registration process when the tracking area changes, and the network continues to capture the position of the terminal device 102. Can be done. Further, since the terminal device 102 acquires the information of the area of the base station device 101 by using the communication circuit using the power of the radio signal from the base station device 101 or the communication circuit having low power consumption, the information is changed. Unless otherwise, it can stay asleep unnecessarily. Therefore, the power consumption of the terminal device 102 can be suppressed sufficiently low.

Claims (16)

It ’s a terminal device,
A first communication means for performing wireless communication in a cellular communication system using the power supply of the terminal device,
A second communication means for receiving a radio signal transmitted from a base station device using the power of the radio signal, and information about an area of the base station device included in the radio signal is a predetermined condition for location registration. When the condition is satisfied or when the radio signal indicates that the data addressed to the terminal device exists , the first communication means is activated , the information about the area does not satisfy the predetermined condition regarding the location registration, and When the radio signal does not indicate that the data addressed to the terminal device exists, the second communication means that does not activate the first communication means and the second communication means.
Have,
The first communication means executes a process for location registration when the predetermined condition regarding the location registration is satisfied and the first communication means is activated.
A terminal device characterized by that. The second communication means determines that the predetermined condition regarding the location registration is satisfied based on the change in the information regarding the received area.
The terminal device according to claim 1. As the process for registering the location, the first communication means receives a signal capable of confirming the tracking area, and makes a location registration request when the tracking area corresponding to the position of the terminal device has changed. Sending to the base station device,
The terminal device according to claim 2. A group of one or more cell identifiers is formed for each tracking area.
As the process for registering the location, the first communication means receives a signal capable of confirming the identifier of the cell, and when the group to which the received identifier belongs has changed, the first communication means makes a location registration request to the base station. Send to device,
The terminal device according to claim 2. The information about the area is information about the tracking area.
The second communication means determines that the predetermined condition regarding the location registration is satisfied based on the change in the information regarding the received tracking area.
The first communication means transmits a location registration request to the base station apparatus as a process for the location registration.
The terminal device according to claim 1. The second communication means holds information on the position of the base station apparatus included in the radio signal when a predetermined condition for location registration is satisfied, and the held information and the received radio signal. It is determined whether or not the change has occurred based on the information regarding the position of the terminal device included in the above.
The terminal device according to any one of claims 2 to 5, wherein the terminal device is characterized by the above. The second communication means receives the radio signal within the system frequency band of the cellular communication system.
The terminal device according to any one of claims 1 to 6, wherein the terminal device is characterized by the above. The second communication means receives the radio signal in the frequency band of the guard band of the cellular communication system.
The terminal device according to any one of claims 1 to 6, wherein the terminal device is characterized by the above. It ’s a base station device,
It has a transmission means for transmitting a radio signal received by the second communication means of the terminal device capable of activating the first communication means of the terminal device for wireless communication in a cellular communication system.
The second communication means of the terminal device receives the radio signal using the power of the radio signal, and receives the radio signal.
It said transmitting means transmits the radio signal indicating that the data exists when data addressed information area of the base station apparatus including Mutotomoni the terminal device is present,
The radio signal is used when the information about the area of the base station device included in the radio signal satisfies a predetermined condition regarding location registration or when the radio signal indicates that data addressed to the terminal device exists. The first communication means is activated in the terminal device, and the radio indicates that the information about the area included in the radio signal does not satisfy a predetermined condition for location registration and that the data addressed to the terminal device exists. When the signal is not shown, the terminal device acts so as not to activate the first communication means.
A base station device characterized by that. The information on the area of the base station apparatus includes the information on the tracking area of the base station apparatus.
The base station apparatus according to claim 9. The transmitting means transmits the radio signal within the system frequency band of the cellular communication system.
The base station apparatus according to claim 9 or 10. The transmitting means transmits the radio signal in the frequency band of the guard band of the cellular communication system.
The base station apparatus according to claim 9 or 10. A first communication means for performing wireless communication in a cellular communication system using the power supply of the terminal device, and a second communication means for receiving a wireless signal transmitted from the base station device using the power of the wireless signal. It is a control method of a terminal device having
The radio signal indicates that the second communication means satisfies the predetermined condition regarding the location registration or the data addressed to the terminal device exists when the information regarding the area of the base station device included in the radio signal satisfies a predetermined condition regarding the location registration. In the case where the first communication means is activated , the information regarding the area does not satisfy the predetermined condition regarding the location registration, and the radio signal does not indicate that the data addressed to the terminal device exists. Do not activate the first communication means and
When the first communication means is activated when a predetermined condition regarding the location registration is satisfied, a process for location registration is executed.
A control method comprising. A control method for a base station device having a transmission means for transmitting a radio signal received by the second communication means of the terminal device capable of activating the first communication means of the terminal device for wireless communication in a cellular communication system. Therefore, the second communication means of the terminal device receives the radio signal using the power of the radio signal, and receives the radio signal.
The control method includes the transmission means for transmitting the radio signal indicating that the data exists when data addressed information area of the base station apparatus including Mutotomoni the terminal device is present only including,
The radio signal is used when the information about the area of the base station device included in the radio signal satisfies a predetermined condition regarding location registration or when the radio signal indicates that data addressed to the terminal device exists. The first communication means is activated in the terminal device, and the radio indicates that the information about the area included in the radio signal does not satisfy a predetermined condition for location registration and that the data addressed to the terminal device exists. When the signal is not shown, the terminal device acts so as not to activate the first communication means.
A control method characterized by that. A first communication means for performing wireless communication in a cellular communication system using the power supply of the terminal device, and a second communication means for receiving a wireless signal transmitted from the base station device using the power of the wireless signal. A program for causing a computer provided in a terminal device having the above to execute the control method according to claim 13. It is provided in a base station apparatus having a transmitting means for transmitting a radio signal received by the second communication means of the terminal device capable of activating the first communication means of the terminal device for wireless communication in a cellular communication system. A program for causing a computer to execute the control method according to claim 14.

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