JP7393800B2 - Base station, communication terminal, communication system, control method, and communication method - Google Patents

Description

The present invention relates to a base station, a communication terminal, a communication system, a control method, and a communication method.

2. Description of the Related Art Communication systems consisting of base stations and communication terminals that perform wireless communication with each other are conventionally known.

For example, Patent Document 1 describes a technique for suppressing power consumption in a communication terminal that performs wireless communication with a base station.

JP 2019-216559 Publication

In communication systems, it is desirable not only to suppress power consumption in communication terminals, but also to suppress power consumption in base stations.

Therefore, the present invention aims to provide a base station, a communication terminal, a communication system, a control method, and a communication method that can suppress power consumption in a base station and suppress power consumption in a communication terminal. purpose.

A base station according to one aspect of the present invention is a base station that performs wireless communication with a communication terminal, and receives at least one of an authentication request and an attribution request for performing the wireless communication transmitted from the communication terminal. a first time calculation unit that calculates a first time related to a terminal wake-up time at which the communication terminal wakes up when the base station reception unit receives the authentication request or the belonging request; When the base station receiving unit receives the authentication request, transmits an authentication response to the communication terminal, and when the base station receiving unit receives the belonging request, transmits a belonging response to the communication terminal, a base station transmitter that includes first time information indicating the first time in at least one of the authentication response and the attribution response; and a base station wake-up unit that causes the base station transmitter to wake up based on the first time. After the base station wake-up time calculation unit that calculates the time and the base station transmission unit transmit the first time information to the communication terminal, the base station transmission unit is put into a sleep state, and the base station transmission unit is put into a sleep state. and a base station control unit that wakes up the base station transmitter when the base station wake-up time comes.

According to the base station configured as described above, the base station transmitter can be placed in a sleep state for a period from when the first time information is transmitted to the communication terminal until the base station wake-up time. That is, power consumption by the base station transmitter during this period can be suppressed.

Furthermore, according to the base station configured as described above, the base station does not transmit information to the communication terminal while the base station transmitter is in the sleep state. Therefore, the communication terminal can stop the function for receiving information transmitted from the base station during this period. That is, power consumption by the communication terminal during this period can be suppressed.

Further, the base station control unit further includes, after the base station transmitting unit transmits the first time information to the communication terminal, putting the base station receiving unit in a sleep state, and causing the base station transmitting unit to sleep. In some cases, the base station receiving unit may be woken up when the base station wake-up time comes.

As a result, the base station receiving unit as well as the base station transmitting unit can be put into a sleep state during the period from when the first time information is transmitted to the communication terminal until the base station wake-up time, and the base station Power consumption can be further reduced.

The base station transmitter further includes a base station clock unit that clocks time, and the base station transmitter includes second time information indicating the time clocked by the base station clock unit in at least one of the authentication response and the attribution response. may be included.

Thereby, the communication terminal can correct the time measured by the communication terminal using the second time information, and can reliably synchronize the wake-up times of the base station and the communication terminal.

Further, at least one of the authentication request and the attribution request includes third time information indicating a time clocked by the communication terminal, and further includes a base station clock unit that clocks the time, and a base station clock unit that clocks the time, and a base station clock unit that clocks the time, and a base station correction section that corrects the time measured by the base station timekeeping section based on the base station timekeeping section.

Thereby, the base station can correct the time measured by the base station using the third time information, and can reliably synchronize the wake-up times of the base station and the communication terminal.

Further, the wireless communication may be based on a communication standard in which transmission time per unit time is limited.

According to the base station having the above configuration, the first time information is included in at least one of the authentication response and the attribution response and is transmitted to the communication terminal. Therefore, there is no need to separately transmit information to the communication terminal in order to transmit the first information to the communication terminal. This reduces the transmission time in wireless communication between the base station and the communication terminal. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time.

Further, the wireless communication may be based on the IEEE802.11ah standard.

According to the base station having the above configuration, the first time information is included in at least one of the authentication response and the attribution response and is transmitted to the communication terminal. Therefore, there is no need to separately transmit information to the communication terminal in order to transmit the first information to the communication terminal. This reduces the transmission time in wireless communication between the base station and the communication terminal. This is particularly useful for wireless communications that comply with the IEEE 802.11ah standard.

Further, the wireless communication is based on the IEEE802.11ai standard, and the base station transmitter further includes encrypted data in the attribution response using the HLP function in the IEEE802.11ai standard. Good too.

Thereby, the encrypted data is included in the attribution response and transmitted to the communication terminal. Therefore, there is no need to separately send information to the communication terminal in order to send encrypted data to the communication terminal. This reduces the transmission time in wireless communication between the base station and the communication terminal. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time.

A communication terminal according to one aspect of the present invention is a communication terminal that performs wireless communication with a base station, and includes a terminal transmitting unit that transmits at least one of an authentication request and an attribution request for performing the wireless communication to the base station. and an authentication response that is transmitted from the base station that received the authentication request and that includes first time information that is calculated by the base station and indicates a first time related to a terminal wake-up time at which the communication terminal wakes up. and a terminal receiving unit that receives at least one of an attribution response that is transmitted from the base station that has received the attribution request and that includes the first time information that indicates the first time calculated by the base station. a terminal wake-up time calculation unit that calculates the terminal wake-up time based on the first time; and after the terminal wake-up time calculation unit calculates the terminal wake-up time, the communication terminal is put into a sleep state, and the communication The communication terminal includes a terminal control unit that wakes up the communication terminal when the terminal wake-up time comes when the terminal is in a sleep state.

According to the communication terminal configured as described above, the communication terminal can be put into a sleep state for a period from after the terminal wake-up time is calculated until the terminal wake-up time. That is, power consumption by the communication terminal during this period can be suppressed.

Further, according to the communication terminal configured as described above, the communication terminal does not receive information transmitted from the base station while the communication terminal is in the sleep state. Therefore, the base station can stop the function for transmitting information to the communication terminal during this period. That is, power consumption by the base station during this period can be suppressed.

Further, at least one of the authentication response and the attribution response includes second time information indicating a time clocked by the base station, and further includes a terminal clock unit that clocks the time, and a terminal clock unit that clocks the time, and a terminal clock unit that clocks the time, and The mobile phone may further include a terminal correction unit that corrects the time measured by the terminal clock unit.

Thereby, the communication terminal can correct the time measured by the communication terminal using the second time information, and can accurately synchronize the wake-up times of the base station and the communication terminal.

Further, the device further includes a terminal clocking section that clocks time, and the terminal transmitting section includes third time information indicating a time clocked by the terminal clocking section in at least one of the authentication request and the attribution request. Good too.

Thereby, the base station can correct the time measured by the base station using the third time information, and can accurately synchronize the wake-up times of the base station and the communication terminal.

Further, the wireless communication may be based on a communication standard in which transmission time per unit time is limited.

According to the communication terminal configured as described above, the first time information is received from the base station while being included in at least one of the authentication response and the attribution response. Therefore, there is no need to separately receive information from the base station in order to receive the first information from the base station. This reduces the transmission time in wireless communication between the base station and the communication terminal. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time.

Further, the wireless communication may be based on the IEEE802.11ah standard.

According to the communication terminal configured as described above, the first time information is received from the base station while being included in at least one of the authentication response and the attribution response. Therefore, there is no need to separately receive information from the base station in order to receive the first information from the base station. This reduces the transmission time in wireless communication between the base station and the communication terminal. This is particularly useful for wireless communications that comply with the IEEE 802.11ah standard.

Further, the wireless communication may be based on the IEEE802.11ai standard, and the terminal transmitter may further include encrypted data in the attribution request using the HLP function in the IEEE802.11ai standard. good.

Thereby, the encrypted data is included in the attribution request and transmitted to the base station. Therefore, there is no need to separately send information to the base station in order to send encrypted data to the base station. This reduces the transmission time in wireless communication between the base station and the communication terminal. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time.

A communication system according to one aspect of the present invention includes the base station and the communication terminal.

According to the communication system configured as described above, the base station transmitter can be put into a sleep state for a period from when the first time information is transmitted to the communication terminal until the base station wake-up time. That is, power consumption by the base station transmitter during this period can be suppressed.

Further, according to the communication system having the above configuration, the communication terminal can be put into a sleep state for a period from after the terminal wake-up time is calculated until the terminal wake-up time. That is, power consumption by the communication terminal during this period can be suppressed.

A control method according to one aspect of the present invention is a control method for a base station that includes a base station transmitter and performs wireless communication with a communication terminal, the method comprising: an authentication for performing the wireless communication transmitted from the communication terminal; When at least one of the request and the attribution request is received, and the authentication request is received, or when the attribution request is received, the communication terminal calculates a first time related to a terminal wake-up time at which the communication terminal wakes up; When the base station transmission unit receives the authentication request, it transmits an authentication response to the communication terminal, and when it receives the attribution request, it transmits an attribution response to the communication terminal. Include first time information indicating the first time in at least one of the responses, calculate a base station wake-up time at which the base station transmitter wakes up based on the first time, and calculate the base station wake-up time at which the base station transmitter wakes up based on the first time; After transmitting to the communication terminal, the base station transmitter is put into a sleep state, and when the base station transmitter is in the sleep state, when the base station wake-up time comes, the base station transmitter is woken up.

According to the above control method, the base station transmitter can be placed in a sleep state for a period from when the first time information is transmitted to the communication terminal until the base station wake-up time. That is, power consumption by the base station transmitter during this period can be suppressed.

Furthermore, according to the above control method, the base station does not transmit information to the communication terminal while the base station transmitter is in the sleep state. Therefore, the communication terminal can stop the function for receiving information transmitted from the base station during this period. That is, power consumption by the communication terminal during this period can be suppressed.

In this way, according to the above control method, it is possible to suppress the power consumption in the base station and the power consumption in the communication terminal.

A control method according to one aspect of the present invention is a control method for a communication terminal that performs wireless communication with a base station, the method comprising: transmitting at least one of an authentication request and an attribution request for performing the wireless communication to the base station. , an authentication response that is transmitted from the base station that received the authentication request and that includes first time information that is calculated by the base station and indicates a first time related to a terminal wake-up time at which the communication terminal wakes up; , receiving at least one of the attribution response transmitted from the base station that received the attribution request and including the first time information, and calculating the terminal wake-up time based on the first time; After calculating the terminal wake-up time, the communication terminal is put into a sleep state, and when the communication terminal is in the sleep state, when the terminal wake-up time is reached, the communication terminal is woken up.

According to the above control method, the communication terminal can be put into a sleep state for a period from after the terminal wake-up time is calculated until the terminal wake-up time. That is, power consumption by the communication terminal during this period can be suppressed.

Further, according to the above control method, the communication terminal does not receive information transmitted from the base station while the communication terminal is in the sleep state. Therefore, the base station can stop the function for transmitting information to the communication terminal during this period, and the power consumption by the base station can be further suppressed.

In this way, according to the above control method, it is possible to suppress the power consumption in the base station and the power consumption in the communication terminal.

A communication method according to one aspect of the present invention is a communication method in which a communication terminal and a base station perform wireless communication, wherein the communication terminal receives at least one of an authentication request and an attribution request for performing the wireless communication. a wireless connection step in which the base station transmits at least one of an authentication response and an attribution response; a first time transmitting step of transmitting a first time related to a wake-up time at which the other party wakes up; and after the first time transmitting step, at least a portion of the base station and at least a portion of the communication terminal are in a sleep state. and after the sleep transition step, when at least some of the base stations and at least some of the communication terminals are in a sleep state, when the wake-up time comes, the base station and a wake-up step in which at least a portion of the communication terminal wakes up.

According to the above communication method, at least a portion of the base station and the communication terminal can be put into a sleep state for a period from when the sleep transition step is executed until the wake-up time. That is, power consumption by the base station and the communication terminal during this period can be suppressed.

In this way, according to the above communication method, it is possible to suppress the power consumption in the base station and the power consumption in the communication terminal.

The present invention can be realized not only as a device, but also as a method in which the processing means constituting the device is a step, or as a program that causes a computer to execute the steps, or as a computer readable computer recording the program. It can also be realized as a recording medium such as a CD-ROM, or as information, data, or a signal indicating the program. These programs, information, data, and signals may be distributed via a communication network such as the Internet.

According to a base station, a communication terminal, a communication system, a control method, and a communication method according to one aspect of the present invention, it is possible to suppress power consumption in a base station and to suppress power consumption in a communication terminal. .

FIG. 1 is a block diagram showing an example of the functional configuration of a communication system according to the first embodiment. FIG. 2 is a schematic diagram showing an example of a communication frame transmitted between a communication terminal and a base station according to the first embodiment. FIG. 3 is a sequence diagram illustrating an example of a first process repeatedly performed by the communication system according to the first embodiment. FIG. 4 is a block diagram illustrating an example of a functional configuration of a communication system according to the second embodiment. FIG. 5 is a sequence diagram illustrating an example of second processing repeatedly performed by the communication system according to the second embodiment. FIG. 6 is a block diagram illustrating an example of a functional configuration of a communication system according to Embodiment 3. FIG. 7 is a sequence diagram illustrating an example of a third process repeatedly performed by the communication system according to the third embodiment.

Hereinafter, embodiments will be specifically described with reference to the drawings.

The embodiments described below each represent a preferred specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention.

(First embodiment)
[1-1. composition]
FIG. 1 is a block diagram showing an example of the functional configuration of a communication system 1 according to the first embodiment.

As shown in FIG. 1, the communication system 1 includes a communication terminal 10 and a base station 20. In FIG. 1, the base station and the communication terminal are illustrated as a minimum configuration of 1:1 for simplicity, but the system may include a plurality of terminals for one base station.

Communication terminal 10 performs wireless communication with base station 20. The communication terminal 10 is a slave device that uses the base station 20 as a parent device, and is generally also called a station.

For example, the wireless communication between the communication terminal 10 and the base station 20 may be wireless communication based on a communication standard in which transmission time per unit time is limited. Specifically, for example, the wireless communication between the communication terminal 10 and the base station 20 may be wireless communication based on the IEEE802.11ah standard. Here, the description will be made assuming that the wireless communication between the communication terminal 10 and the base station 20 is wireless communication performed in the 920 MHz band and conforms to the IEEE802.11ah standard.

Furthermore, for example, the wireless communication between the communication terminal 10 and the base station 20 may be wireless communication based on the IEEE802.11ai standard. Here, the wireless communication between the communication terminal 10 and the base station 20 will be described as wireless communication based on the IEEE802.11ai standard.

As shown in FIG. 1, the communication terminal 10 includes a terminal transmitting section 11, a terminal receiving section 12, a terminal wake-up time calculating section 13, a terminal clocking section 14, a terminal correcting section 15, and a terminal controlling section 16. Be prepared.

The terminal transmitter 11 transmits at least one of an authentication request and an association request to the base station 20. Here, it will be explained that the terminal transmitting unit 11 transmits an authentication request and an affiliation request to the base station 20.

The authentication request is an authentication request for wirelessly connecting the communication terminal 10 to the base station 20 in order to establish a wireless connection between the communication terminal 10 and the base station 20 and perform wireless communication between the communication terminal 10 and the base station 20. It is a request to receive. The belonging request is a request for making the communication terminal 10 belong to the base station 20 in order to establish a wireless connection between the communication terminal 10 and the base station 20 and perform wireless communication between the communication terminal 10 and the base station 20. .

FIG. 2 is a schematic diagram showing an example of communication frames transmitted and received between the communication terminal 10 and the base station 20.

As shown in FIG. 2, the communication frame is, for example, IEEE Std. It includes the Vendor Specific Element (hereinafter also referred to as VSE) of 9.4.2.26 of 802.11-2016. For example, IEEE Std. A communication frame to which the VSE is added is used in the Authentication frame format of 9.3.3.12 of 802.11-2016. In addition, for sending the attribution request, IEEE Std. A communication frame to which the VSE is added is used in the Association Request frame format of 9.3.3.6 of 802.11-2016. In addition, the IEEE Std. A communication frame to which the VSE is added is used in the Association Response frame format of 9.3.3.7 of 802.11-2016.

The communication frame transmitted between the communication terminal 10 and the base station 20 includes an Element ID, Length, Organization Identifier, and Vendor-specific Content.

The Element ID is an ID for identifying the Element, and here, 221 is used to indicate that it is a VSE.

Length indicates the data length of Element.

Organization Identifier is information for identifying a transmission source (organization) of a communication frame, and includes a unique identifier assigned by IEEE.

Further, as an example of an embodiment of the present invention, the Vendor-specific Content includes time information indicating the time (for example, first time information, second time information, etc. to be described later). For example, Vendor-specific Content includes 8 bytes of data counted up in microseconds.

Note that the communication frames used for transmitting the authentication request, the belonging request, the authentication response, and the belonging response are not limited to the above configuration, and any communication frame that can include time information may be used.

Returning to FIG. 1 again, the description of the configuration of the communication system 1 will be continued.

The terminal transmitter 11 can include encrypted data in the attribution request using the HLP function in the IEEE802.11ai standard. Here, it will be explained that the terminal transmitter 11 uses the HLP function in the IEEE802.11ai standard to include encrypted data in the attribution request.

The terminal transmitter 11 is configured such that, for example, a CPU (Central Processing Unit, not shown) included in the communication terminal 10 executes a program stored in a memory (not shown) included in the communication terminal 10 so that the communication terminal 10 This is realized by performing processing using a provided antenna (not shown) and an RF (Radio Frequency) circuit (not shown).

The terminal receiving unit 12 receives a first time, which is transmitted from the base station 20 that has received the authentication request and is calculated by the base station 20 that has received the authentication request, and which indicates a first time related to the terminal wake-up time at which the communication terminal 10 wakes up. an authentication response including time information; and an attribution including the first time information transmitted from the base station 20 that received the attribution request and indicating the first time calculated by the base station 20 that received the attribution request. receiving at least one of the responses;

Here, the first time information is embedded in the VSE Vendor-specific Content included in the communication frame transmitted from the base station 20 to the communication terminal 10, so that the first time information is included in the authentication response and/or the attribution response. and is transmitted from the base station 20 to the communication terminal 10. Then, the terminal receiving unit 12 receives the authentication response and/or the attribution response.

Here, the terminal receiving unit 12 receives an attribution response that is transmitted from the base station 20 that received the attribution request and includes the first time information indicating the first time calculated by the base station 20 that received the attribution request. The following description will be made assuming that the base station 20 receives the authentication request and receives the authentication response transmitted from the base station 20 that received the authentication request.

The terminal receiving unit 12 can receive encrypted data included in the attribution response using the HLP (Higher Layer Protocol) function in the IEEE802.11ai standard.

That is, when the HLP function in the IEEE802.11ai standard is used, when establishing a wireless connection between the communication terminal 10 and the base station 20, encryption is performed with the upper protocol (for example, DHCP (Dynamic Host Configuration Protocol)). data can be exchanged.

Further, at least one of the authentication response and the attribution response received by the terminal receiving unit 12 may include second time information indicating the time clocked by the base station 20.

Here, the second time information is embedded in the VSE Vendor-specific Content included in the communication frame transmitted from the base station 20 to the communication terminal 10, so that the second time information is included in the authentication response and/or the attribution response. and is transmitted from the base station 20 to the communication terminal 10. The second time information is the time measured when any of the responses is returned from the base station 20 to the communication terminal 10. Then, the terminal receiving unit 12 receives the second time information together with the authentication response and/or the attribution response.

Here, explanation will be given assuming that the second time information is included in the attribution response received by the terminal receiving unit 12.

The terminal receiving unit 12 is configured such that, for example, a CPU (Central Processing Unit, not shown) included in the communication terminal 10 executes a program stored in a memory (not shown) included in the communication terminal 10 so that the communication terminal 10 This is realized by performing processing using a provided antenna (not shown) and an RF circuit (not shown).

The terminal wake-up time calculation unit 13 calculates the terminal wake-up time based on the first time information and the time measured by the terminal clock unit 14 corrected by the terminal correction unit 15 (described later). The terminal wake-up time calculation unit 13 is realized, for example, by a CPU (not shown) included in the communication terminal 10 executing a program stored in a memory (not shown) included in the communication terminal 10.

The terminal timer 14 measures time. The terminal timer 14 is realized, for example, by a timer (not shown) included in the communication terminal 10. Further, the terminal timer 14 may be implemented, for example, by a counter (not shown) provided in the communication terminal 10 and operated in synchronization with a clock signal.

The terminal correction unit 15 corrects the time measured by the terminal clock unit 14 based on the second time information. The terminal correction unit 15 is realized, for example, by a CPU (not shown) included in the communication terminal 10 executing a program stored in a memory (not shown) included in the communication terminal 10.

The terminal control unit 16 puts the communication terminal 10 into a sleep state after the terminal wake-up time calculation unit 13 calculates the terminal wake-up time, and when the communication terminal 10 is in the sleep state and the terminal wake-up time comes, the terminal control unit 16 puts the communication terminal 10 into a sleep state. wake up

Here, the sleep state of the communication terminal 10 refers to a state in which at least part of the operation of the communication terminal 10 is restricted. By putting the communication terminal 10 into the sleep state, power consumption of the communication terminal 10 is suppressed. The sleep state of the communication terminal 10 may be, for example, a state in which all functions of the communication terminal 10 except for the function of measuring time and the function of waking up the communication terminal 10 in the sleep state are stopped. However, for example, the communication terminal 10 may be in a state of intermittent operation. Moreover, here, waking up the communication terminal 10 in the sleeping state means causing the communication terminal 10 in the sleeping state to cancel the sleep state.

Base station 20 performs wireless communication with communication terminal 10 . The base station 20 is a parent device that uses the communication terminal 10 as a slave device, and is also generally called an access point. As shown in FIG. , a base station wake-up time calculation section 23, a base station clock section 24, a first time calculation section 25, and a base station control section 26.

The base station receiving unit 22 receives at least one of an authentication request for wireless communication and an affiliation request transmitted from the communication terminal 10.

Here, the base station receiving unit 22 will be described as receiving the authentication information and the belonging request transmitted from the communication terminal 10.

The base station receiving unit 22 can receive encrypted data included in the attribution request using the HLP function in the IEEE802.11ai standard.

The base station receiving unit 22 is configured such that, for example, a CPU (not shown) included in the base station 20 executes a program stored in a memory (not shown) included in the base station 20 and receives an antenna (not shown) included in the base station 20. (not shown) and an RF circuit (not shown).

The first time calculation unit 25 calculates a first time related to the terminal wake-up time when the base station reception unit 22 receives the authentication request or the belonging request.

Here, the description will be given assuming that the first time calculation unit 25 calculates the first time related to the terminal wake-up time when the base station reception unit 22 receives the belonging request.

Note that the first time calculation unit 25 may calculate the first time related to the terminal wake-up time when the base station reception unit 22 receives the authentication request.

Further, the first time calculation unit 25 may calculate the first time based on the amount of data to be transmitted from the base station 20 to the communication terminal 10, for example, or may calculate the first time based on the amount of data to be transmitted from the base station 20 to the communication terminal 10. The first information may be calculated based on the upper limit of power or the upper limit of power consumption required of the base station 20, or may be calculated using a predetermined time as the first time, for example.

The first time calculation unit 25 is realized, for example, by a CPU (not shown) included in the base station 20 executing a program stored in a memory (not shown) included in the base station 20.

The base station wake-up time calculation unit 23 calculates the base station wake-up time based on the first time information. The base station wake-up time calculation unit 23 is realized, for example, by a CPU (not shown) included in the base station 20 executing a program stored in a memory (not shown) included in the base station 20.

The base station timer 24 measures time. The base station timer 24 is realized, for example, by a timer (not shown) included in the base station 20. Further, the base station timer 24 may be implemented, for example, by a counter (not shown) provided in the base station 20 and operated in synchronization with a clock signal.

The base station transmitting unit 21 transmits an authentication response to the communication terminal 10 when the base station receiving unit 22 receives the authentication request from the communication terminal 10, and the base station receiving unit 22 receives the belonging request from the communication terminal 10. When received, an attribution response is transmitted to the communication terminal 10, and first time information indicating the first time is included in at least one of the authentication response and the attribution response. Here, explanation will be given assuming that the first time information is included in the attribution response.

The base station transmitter 21 can include encrypted data in the attribution response using the HLP function in the IEEE802.11ai standard.

The base station transmitter 21 can include second time information indicating the time clocked by the base station timer 24 in at least one of the authentication response and the attribution response.

Here, the second time information is embedded in the VSE included in the communication frame transmitted from the base station 20 to the communication terminal 10, and is included in the authentication response and/or the attribution response. from there to the communication terminal 10.

Here, the explanation will be given assuming that the base station transmitter 21 includes the second time information in the attribution response.

After the base station transmitter 21 transmits the first time information to the communication terminal 10, the base station controller 26 puts the base station transmitter 21 into a sleep state, and when the base station transmitter 21 is in the sleep state, When the station wake-up time comes, the base station transmitter 21 is woken up.

Here, the sleep state of the base station transmitter 21 refers to a state in which the operation of at least a portion of the base station transmitter 21 is restricted. By putting the base station transmitter 21 into the sleep state, power consumption of the base station transmitter 21 is suppressed. That is, power consumption of base station 20 is suppressed. The sleep state of the base station transmitter 21 may be, for example, a state in which the base station transmitter 21 is stopped, or may be, for example, a state in which the base station transmitter 21 operates intermittently. Furthermore, here, waking up the base station transmitter 21 means causing the base station transmitter 21 in the sleep state to cancel the sleep state.

Note that if only the base station transmitting unit 21 of the base station 20 is put into a sleep state, a certain reduction in power consumption can be expected, and it will be possible to receive connection requests from other communication terminals. .

[1-2. motion]
The communication system 1 having the above configuration includes a first communication terminal 10 in which the sleep state is released and the base station 20 in the awake state, and a base station transmitter 21 transmitting and receiving data between the communication terminal 10 in the awake state and the base station 20 in the awake state. Data transmission/reception processing is performed repeatedly.

More specifically, in the communication system 1, (1) the communication terminal 10 and the base station transmitter 21 are in a sleep state, (2) the communication terminal 10 and the base station transmitter 21 wake up, (3) A first data transmission/reception process is performed between the communication terminal 10 and the base station 20, and (4) After the first data transmission/reception process is completed, the communication terminal 10 and the base station transmission unit 21 are put into a sleep state. A series of processes (hereinafter also referred to as "first process") are repeatedly performed.

The first process repeatedly performed by the communication system 1 will be described below with reference to the drawings.

FIG. 3 is a sequence diagram showing an example of the first process repeatedly performed by the communication system 1.

In the following, a state in which the communication terminal 10 and the base station transmitter 21 are in a sleep state will be described as an initial state.

Note that the first process shown in FIG. 3 is based on the assumption that a part of the procedure for establishing a wireless connection between the communication terminal 10 and the base station 20 has already been performed before the first process in FIG. explain. Here, some of the procedures for establishing a wireless connection are known techniques (for example, probe request and response processing, etc.) and will not be described in detail, but in any case, communication terminal 10 and base station 2 is already in a state where it is possible to start wireless communication with.

As shown in FIG. 3, in an initial state in which the communication terminal 10 and the base station transmitting unit 21 are in a sleep state, when the terminal wake-up time T1 comes, the terminal control unit 16 wakes up the communication terminal 10 (step S10), When the base station wake-up time T2 comes, the base station controller 26 wakes up the base station transmitter 21 (step S11).

Here, the terminal wake-up time is calculated by the process of step S23 (described later) in the first process performed last time. If the first process to be performed this time is the first process to be performed in the communication system 1, the terminal wake-up time may be a preset time, for example. Further, the base station wake-up time is calculated by the process of step S25 (described later) in the first process performed last time. If the first process to be performed this time is the first process to be performed in the communication system 1, the base station wake-up time may be a preset time, for example.

When the communication terminal 10 and the base station transmitter 21 are in the awake state, the communication terminal 10 and the base station 20 start the first data transmission/reception process.

When the first data transmission/reception process is started, the terminal transmission unit 11 transmits an authentication request to the base station 20 (step S12). Then, the base station receiving unit 22 receives the authentication request (step S13).

When the base station receiving unit 22 receives the authentication request, the base station transmitting unit 21 transmits an authentication response, which is a response to the authentication request, to the communication terminal 10 (step S14). Then, the terminal receiving unit 12 receives the authentication response (step S15).

When the terminal receiving unit 12 receives the authentication response, the terminal transmitting unit 11 transmits a belonging request to the base station 20 (step S16). At this time, the terminal transmitter 11 uses the HLP function in the IEEE802.11ai standard to include encrypted data in the attribution request. Then, it transmits an attribution request including the encrypted data to the base station 20. Then, the base station receiving unit 22 receives the belonging request (step S17).

When the base station receiving unit 22 receives the attachment request, the first time calculation unit 25 calculates the first time (step S18).

When the first time calculation unit 25 calculates the first time, the base station transmission unit 21 transmits the first time information and the second time information indicating the time measured by the base station time measurement unit 24 to the processing in step S17. (Step S19), and transmits the belonging response to the communication terminal 10 (Step S20). At this time, the base station transmitter 21 uses the HLP function in the IEEE802.11ai standard to include encrypted data in the attribution response. Then, an attribution response containing the encrypted data is transmitted to the communication terminal 10. Then, the terminal receiving unit 12 receives the attribution response (step S21).

In the process of step S21, when the terminal receiving unit 12 receives the attribution response, the communication terminal 10 and the base station 20 end the first data transmission/reception process.

In the communication terminal 10, when the first data transmission/reception process is completed, the terminal correcting section 15 corrects the time measured by the terminal clocking section 14 based on the second time information (step S22).

When the terminal correction unit 15 corrects the time, the terminal wake-up time calculation unit 13 calculates the terminal wake-up time based on the first time information (step S23). At this time, the terminal wake-up time calculation unit 13 calculates the terminal wake-up time in anticipation of a time margin from when the terminal control unit 16 wakes up the communication terminal 10 until the communication terminal 10 starts the first data transmission/reception process. The wake-up time may be calculated, or, for example, the first time may be calculated as the terminal wake-up time.

When the terminal wake-up time calculation unit 13 calculates the terminal wake-up time, the terminal control unit 16 shifts the communication terminal 10 to a sleep state (step S24).

The communication terminal 10 that has entered the sleep state is woken up by the process of step S10 in the first process to be performed next time.

On the other hand, in the base station 20, when the first data transmission/reception process is completed, the base station wake-up time calculation unit 23 calculates the base station wake-up time based on the first time information (step S25). At this time, the base station wake-up time calculation section 23 calculates, for example, a time margin from when the base station control section 26 wakes up the base station reception section 22 until when the base station 20 starts the first data transmission/reception process. The base station wake-up time may be calculated in consideration of this, or, for example, the first time may be calculated as the base station wake-up time.

When the base station wake-up time calculation section 23 calculates the base station wake-up time, the base station control section 26 causes the base station transmission section 21 to enter a sleep state (step S26).

The base station transmitter 21 that has entered the sleep state is woken up by the process of step S11 in the first process to be performed next time.

[1-3. Consideration]
According to the base station 20 having the above configuration, the base station transmitter 21 can be put into a sleep state for a period from when the first time information is transmitted to the communication terminal 10 until the base station wake-up time. That is, power consumption by the base station transmitter 21 during this period can be suppressed.

Therefore, according to the base station 20, power consumption in the base station 20 can be suppressed.

According to the communication terminal 10 having the above configuration, the communication terminal 10 can be put into a sleep state for a period from after the terminal wake-up time is calculated until the terminal wake-up time. That is, power consumption by the communication terminal 10 during this period can be suppressed.

Therefore, according to the communication terminal 10, power consumption in the communication terminal 10 can be suppressed.

According to the base station 20 having the above configuration, the encrypted data is included in the attribution response and transmitted to the communication terminal 10. Therefore, there is no need to separately send information to the communication terminal 10 in order to send the encrypted data to the communication terminal 10. Thereby, the transmission time in wireless communication between base station 20 and communication terminal 10 is suppressed. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time, for example, wireless communications that comply with the IEEE 802.11ah standard.

According to the communication terminal 10 configured as described above, the encrypted data is included in the attribution request and transmitted to the base station 20. Therefore, there is no need to separately send information to the base station 20 in order to send encrypted data to the base station 20. Thereby, the transmission time in wireless communication between base station 20 and communication terminal 10 is suppressed. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time, for example, wireless communications that comply with the IEEE 802.11ah standard.

According to the base station 20 having the above configuration, the first time information is included in at least one of the authentication response and the attribution response (here, in the attribution response) and is transmitted to the communication terminal 10. Therefore, there is no need to separately transmit information to the communication terminal 10 in order to transmit the first information to the communication terminal 10. Thereby, the transmission time in wireless communication between base station 20 and communication terminal 10 is suppressed. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time, for example, wireless communications that comply with the IEEE 802.11ah standard.

According to the communication terminal 10 having the above configuration, the first time information is received from the base station 20 while being included in at least one of the authentication response and the attribution response (in this case, the attribution response). Therefore, there is no need to separately receive information from the base station 20 in order to receive the first information from the base station 20. Thereby, the transmission time in wireless communication between base station 20 and communication terminal 10 is suppressed. This is particularly useful for wireless communications that comply with communication standards that limit transmission time per unit time, for example, wireless communications that comply with the IEEE 802.11ah standard.

According to the communication terminal 10 having the above configuration, the time measured by the communication terminal 10 can be corrected using the second time information.

For example, the base station 20 may not transmit beacons periodically (for example, every 100 ms) while the base station transmitter 21 is in the sleep state. In this case, the base station 20 cannot transmit a beacon while the base station transmitter 21 is in the sleep state, but if the base station receiver 22 is in the sleep state while the base station transmitter 21 is in the sleep state. Therefore, a scan such as a probe request can be received, and in response to this, the base station transmitter 21 may wake up and transmit a probe response. In this way, even if the base station 20 stops some functions (not transmitting beacons) while the base station transmitter 21 is in the sleep state, it is possible to support the specifications of the infrastructure mode to some extent. It can also be used with existing communication terminals.

(Embodiment 2)
A communication system according to a second embodiment that is configured by partially changing the communication system 1 according to the first embodiment will be described below.

In the communication system 1 according to the first embodiment, after the base station transmitter 21 transmits the first time information to the communication terminal 10, the base station transmitter 21 goes into a sleep state; In this example, the base station transmitter 21 wakes up when the base station wake-up time arrives.

On the other hand, in the communication system according to the second embodiment, after the base station transmitting section 21 transmits the first time information to the communication terminal 10, the base station receiving section 22 in addition to the base station transmitting section 21 is also put into a sleep state. This is an example of a configuration in which the base station transmitter 21 and the base station receiver 22 wake up when the base station wake-up time comes when the base station transmitter 21 is in a sleep state.

In the following, regarding the communication system according to Embodiment 2, the same components as those in communication system 1 will be given the same reference numerals as they have already been explained, and detailed explanation thereof will be omitted, and differences from communication system 1 will be explained. I will mainly explain.

[2-1. composition]
FIG. 4 is a block diagram showing an example of a functional configuration of a communication system 1A according to the second embodiment.

As shown in FIG. 4, the communication system 1A is configured by changing the base station 20 from the communication system 1 according to Embodiment 1 to a base station 20A, and changing the base station control unit 26 to a base station control unit 26A. and configured.

After the base station transmitting unit 21 transmits the first time information to the communication terminal 10, the base station control unit 26A puts the base station transmitting unit 21 and the base station receiving unit 22 into a sleep state, and the base station transmitting unit 21 and the base station When the station receiving section 22 is in a sleep state, when the base station wake-up time comes, the base station transmitting section 21 and the base station receiving section 22 are woken up.

Here, the sleep state of the base station receiving section 22 refers to a state in which the operation of at least a portion of the base station receiving section 22 is restricted. By putting the base station receiving section 22 into the sleep state, power consumption of the base station receiving section 22 is suppressed. That is, power consumption of the base station 20A is suppressed. The sleep state of the base station receiving section 22 may be, for example, a state in which the base station receiving section 22 is stopped, or may be, for example, a state in which the base station receiving section 22 operates intermittently. Furthermore, here, waking up the base station receiving section 22 means causing the base station receiving section 22 in the sleep state to cancel the sleep state.

[2-2. motion]
The communication system 1A having the above configuration repeatedly performs the first data transmission/reception process between the communication terminal 10 in the awake state and the base station 20A in which the base station transmitting section 21 and the base station receiving section 22 are in the awake state.

More specifically, the communication system 1A changes from (1) a state in which the communication terminal 10, the base station transmitter 21, and the base station receiver 22 are in a sleep state to (2) a state in which the communication terminal 10 and the base station transmitter 21 are in a sleep state. and the base station receiving unit 22 wake up, (3) perform a first data transmission/reception process between the communication terminal 10 and the base station 20A, and (4) perform communication after the first data transmission/reception process is completed. A series of processing (hereinafter also referred to as "second processing") in which the terminal 10, the base station transmitter 21, and the base station receiver 22 go into a sleep state is repeatedly performed.

The second process repeatedly performed by the communication system 1A will be described below with reference to the drawings, focusing on the differences from the first process according to the first embodiment.

FIG. 5 is a sequence diagram showing an example of the second process repeatedly performed by the communication system 1A.

In the following, a state in which the communication terminal 10, the base station transmitter 21, and the base station receiver 22 are in a sleep state will be described as an initial state.

Note that the second process shown in FIG. 5 is similar to the first process according to the first embodiment shown in FIG. The following explanation assumes that some of the procedures for establishing a wireless connection have been performed.

As shown in FIG. 5, the second process is a process in which the process of step S11 is changed to the process of step S111 and the process of step S26 is changed to the process of step S126 from the first process according to the first embodiment. It is. Therefore, here, the processing in step S111 and the processing in step S126 will be mainly described.

As shown in FIG. 5, in an initial state in which the communication terminal 10, the base station transmitter 21, and the base station receiver 22 are in a sleep state, when the base station wake-up time T2 comes, the base station controller 26A controls the base station transmitter. The unit 21 and the base station receiving unit 22 are woken up (step S111).

Here, the base station wake-up time is calculated by the process of step S25 in the second process performed last time. If the second process to be performed this time is the first process to be performed in the communication system 1A, the base station wake-up time may be a preset time, for example.

When the communication terminal 10, the base station transmitter 21, and the base station receiver 22 are awake, the communication terminal 10 and the base station 20A start the first data transmission/reception process.

In the process of step S25, when the base station wake-up time calculation unit 23 calculates the base station wake-up time, the base station control unit 26A puts the base station transmission unit 21 and the base station reception unit 22 into a sleep state (step S126 ).

The base station transmitting unit 21 and the base station receiving unit 22, which have gone into a sleep state, are woken up by the process of step S111 in the second process to be performed next time.

[2-3. Consideration]
According to the base station 20A having the above configuration, the base station receiving unit 22 in addition to the base station transmitting unit 21 is put into a sleep state during the period from when the first time information is transmitted to the communication terminal 10 until the base station wake-up time. I can do it. That is, in addition to the power consumption by the base station transmitter 21 during this period, the power consumption by the base station receiver 22 can also be suppressed.

Therefore, according to base station 20A, power consumption in base station 20A can be further suppressed than base station 20 according to the first embodiment.

In this way, the base station 20A can further suppress power consumption than the base station 20 according to the first embodiment, but the base station receiving unit 22 goes into a sleep state. Therefore, the base station 20A is particularly useful in an environment where there is no need to communicate with devices other than the communication terminal 10, and where it is necessary to suppress the power consumption of the base station 20A.

(Embodiment 3)
A communication system according to a third embodiment that is configured by partially changing the communication system 1 according to the first embodiment will be described below.

In the communication system 1 according to the first embodiment, the base station 20 transmits the second time information indicating the time measured by the base station timer 24 to the communication terminal 10, and the communication terminal 10 transmits the second time information to the communication terminal 10. This is an example of a configuration for correcting the time measured by the terminal timer 14 based on the above.

On the other hand, in the communication system according to the third embodiment, the communication terminal according to the third embodiment transmits third time information indicating the time clocked by the terminal timer 14 to the base station 20 according to the third embodiment. This is an example of a configuration in which the base station 20 corrects the time measured by the base station timer 24 based on the third time information.

In the following, regarding the communication system according to Embodiment 3, the same components as those in communication system 1 will be given the same reference numerals as they have already been explained, and detailed explanation thereof will be omitted, and differences from communication system 1 will be explained. I will mainly explain.

[3-1. composition]
FIG. 6 is a block diagram showing an example of a functional configuration of a communication system 1B according to the third embodiment.

As shown in FIG. 6, the communication system 1B is configured by changing the communication terminal 10 from the communication system 1 according to Embodiment 1 to a communication terminal 10B and changing the base station 20 to a base station 20B. Furthermore, the communication terminal 10B is configured by changing the terminal transmitting section 11 from the communication terminal 10 to a terminal transmitting section 11B and deleting the terminal correcting section 15. Furthermore, the base station 20B is configured by changing the base station receiving section 22 from the base station 20 to a base station receiving section 22B, and adding a base station correction section 27.

In addition to the functions that the terminal transmitter 11 according to the first embodiment has, the terminal transmitter 11B further has the following functions.

That is, the terminal transmitting unit 11B can include the third time information indicating the time clocked by the terminal clock unit 14 in at least one of the authentication request and the belonging request.

Here, the third time information is embedded in the VSE included in the communication frame transmitted from the communication terminal 10B to the base station 20B, and is included in the authentication request and/or the attribution request. The signal is transmitted from the base station 20B to the base station 20B.

Here, it will be explained that the terminal transmitting unit 11B includes the third time information in the belonging request.

In addition to the functions that the base station receiving section 22 according to the first embodiment has, the base station receiving section 22B further has the following functions.

That is, at least one of the authentication request and the affiliation request received by the base station receiving unit 22B includes third time information indicating the time clocked by the communication terminal 10B.

Here, explanation will be given assuming that the third time information is included in the belonging request received by the base station receiving unit 22B.

The base station corrector 27 corrects the time measured by the base station timer 24 based on the third time information. The base station correction unit 27 is realized, for example, by a CPU (not shown) included in the base station 20B executing a program stored in a memory (not shown) included in the base station 20B.

[3-2. motion]
The communication system 1B having the above configuration repeatedly performs a second data transmission/reception process in which the base station transmitter 21 transmits and receives data between the communication terminal 10B in the awake state and the base station 20B in the awake state. Here, this second data transmission/reception processing is a process in which a part of the processing is changed from the first data transmission/reception processing according to the first embodiment.

More specifically, in the communication system 1B, (1) the communication terminal 10B and the base station transmitter 21 are in a sleep state, (2) the communication terminal 10B and the base station transmitter 21 wake up, (3) A second data transmission/reception process is performed between the communication terminal 10B and the base station 20B, and (4) After the second data transmission/reception process is completed, the communication terminal 10B and the base station transmission unit 21 are put into a sleep state. A series of processes (hereinafter also referred to as "third process") are repeatedly performed.

The third process repeatedly performed by the communication system 1B will be described below with reference to the drawings, focusing on the differences from the first process according to the first embodiment.

FIG. 7 is a sequence diagram showing an example of the third process repeatedly performed by the communication system 1B.

In the following, a state in which the communication terminal 10B and the base station transmitter 21 are in a sleep state will be described as an initial state.

Note that the third process shown in FIG. 7 is similar to the first process according to the first embodiment shown in FIG. The following explanation assumes that some of the procedures for establishing a wireless connection have been performed.

As shown in FIG. 7, in the third process, the process of step S16 to step S22 is changed from the first process according to the first embodiment to the process of step S201 to step S207, and further, step This is an added process to which the process of S208 is added. Therefore, here, the processing of steps S201 to S207 and the processing of step S208 will be mainly described.

As shown in FIG. 7, in the process of step S15, when the terminal receiving unit 12 receives the authentication response, the terminal transmitting unit 11B embeds third time information indicating the time measured by the terminal clocking unit 14 in the attribution request. (Step S201), and transmits the belonging request to the base station 20B (Step S202). At this time, the terminal transmitter 11B uses the HLP function in the IEEE802.11ai standard to include encrypted data in the attribution request. Then, an attribution request including the encrypted data is transmitted to the base station 20B. Then, the base station receiving unit 22B receives the belonging request (step S203).

When the base station receiving unit 22B receives the attachment request, the first time calculation unit 25 calculates the first time (step S204).

When the first time calculation unit 25 calculates the first time, the base station transmission unit 21 embeds the first time information in the attribution response to the attribution request received in the process of step S203 (step S205), and is transmitted to the communication terminal 10B (step S206). At this time, the base station transmitter 21 uses the HLP function in the IEEE802.11ai standard to include encrypted data in the attribution response. Then, an attribution response including the encrypted data is transmitted to the communication terminal 10B. Then, the terminal receiving unit 12 receives the attribution response (step S207).

In the process of step S207, when the terminal receiving unit 12 receives the attribution response, the communication terminal 10B and the base station 20B end the second data transmission/reception process.

In the communication terminal 10B, when the second data transmission/reception process is completed, the process proceeds to step S23.

In the base station 20B, when the second data transmission/reception process is completed, the base station correction unit 27 corrects the time measured by the base station timer 24 based on the third time information (step S208). Then, the process advances to step S25.

[3-3. Consideration]
According to the communication terminal 10B having the above configuration, the time measured at the base station 20B can be corrected using the third time information.

(Other embodiments)
Although the communication system and the like according to the present invention have been described above based on Embodiments 1 to 3, the present invention is not limited to these embodiments. Unless departing from the spirit of the present invention, various modifications that can be thought of by those skilled in the art to this embodiment, and forms constructed by combining components of different embodiments are also included within the scope of the present invention. It will be done.

For example, in the example shown so far, the first time related to the wake-up time is calculated at the base station and transmitted to the communication terminal, but the first time is calculated at the communication terminal side. , may be transmitted toward the base station. This aspect is applicable not only when there is a one-to-one relationship between a communication terminal and a base station, but also when there is a plurality of communication terminals for one base station. In that case, when the first time specified by one of the communication terminals arrives, the base station will wake up if it is in the sleep state, and if it has already woken up and the wake-up time specified by the other communication terminal has passed, it will wake up as it is. All you have to do is continue. Note that in this aspect, the portion of the base station that transitions to the sleep state may be only the base station transmitter, or may include both the transmitter and receiver of the base station.

In addition, although the first time is included in a frame (authentication or attribution request or response) required during the wireless connection step between the communication terminal and the base station, it may also be included in a frame during communication, for example, immediately before the end of communication. Good too. Alternatively, without including it in the frame, the administrator may set it in each device (for example, set it to wake up 60 minutes after the end of each communication) when the device is installed and before the start of communication.

The present invention can be realized not only as a device, but also as a method in which the processing means constituting the device is a step, or as a program that causes a computer to execute the steps, or as a computer readable computer recording the program. It can also be realized as a recording medium such as a CD-ROM, or as information, data, or a signal indicating the program. These programs, information, data, and signals may be distributed via a communication network such as the Internet.

INDUSTRIAL APPLICATION This invention can be utilized for the communication system etc. which consist of the base station and communication terminal which mutually perform wireless communication.

1, 1A, 1B Communication system 10, 10B Communication terminal 11, 11B Terminal transmitter 12 Terminal receiver 13 Terminal wake-up time calculator 14 Terminal timer 15 Terminal correction unit 16 Terminal controller 20, 20A, 20B Base station 21 Base station Transmission unit 22, 22B Base station reception unit 23 Base station wake-up time calculation unit 24 Base station clock unit 25 First time calculation unit 26, 26A Base station control unit 27 Base station correction unit

Claims (17)

A base station that performs wireless communication with a communication terminal,
a base station receiving unit that receives at least one of an authentication request and an attribution request for performing the wireless communication, which are transmitted from the communication terminal;
a first time calculation unit that calculates a first time related to a terminal wake-up time at which the communication terminal wakes up when the base station reception unit receives the authentication request or the belonging request;
When the base station receiving unit receives the authentication request, transmits an authentication response to the communication terminal, and when the base station receiving unit receives the belonging request, transmits a belonging response to the communication terminal, a base station transmitter that includes first time information indicating the first time in at least one of the authentication response and the attribution response;
a base station wake-up time calculation unit that calculates a base station wake-up time at which the base station transmission unit wakes up based on the first time;
After the base station transmitter transmits the first time information to the communication terminal, the base station transmitter puts the base station transmitter into a sleep state, and when the base station transmitter is in the sleep state, the base station wake-up time and a base station control unit that wakes up the base station transmission unit. The base station control unit further sets the base station receiving unit to a sleep state after the base station transmitting unit transmits the first time information to the communication terminal, and when the base station transmitting unit is in a sleep state, The base station according to claim 1, wherein when the base station wake-up time comes, the base station receiving unit is woken up. Furthermore, it is equipped with a base station clock unit that keeps track of time.
The base station according to claim 1 or 2, wherein the base station transmitter causes at least one of the authentication response and the attribution response to include second time information indicating a time clocked by the base station clock unit. . At least one of the authentication request and the attribution request includes third time information indicating a time measured by the communication terminal,
moreover,
a base station clock unit that clocks time;
The base station according to claim 1 or 2, further comprising: a base station correction unit that corrects the time measured by the base station timer based on the third time information. The base station according to any one of claims 1 to 4, wherein the wireless communication conforms to a communication standard in which transmission time per unit time is limited. The base station according to claim 5, wherein the wireless communication conforms to the IEEE802.11ah standard. The wireless communication is based on the IEEE802.11ai standard,
The base station according to claim 5 or 6, wherein the base station transmitter further includes encrypted data in the attribution response by using an HLP function in the IEEE802.11ai standard. A communication terminal that performs wireless communication with a base station,
a terminal transmitting unit that transmits at least one of an authentication request and an attribution request for performing the wireless communication to the base station;
Pertains to both a terminal wake-up time at which the communication terminal wakes up and a base station wake-up time at which the base station wakes up, which is transmitted from the base station that received the authentication request and calculated by the base station. an authentication response including first time information indicating a first time; and the first time information indicating the first time transmitted from the base station that received the attribution request and calculated by the base station. a terminal receiving unit that receives at least one of the attribution responses containing the attribution response;
a terminal wake-up time calculation unit that calculates the terminal wake-up time based on the first time;
After the terminal wake-up time calculation unit calculates the terminal wake-up time, the communication terminal is put into a sleep state, and when the communication terminal is in the sleep state, when the terminal wake-up time comes, the terminal control causes the communication terminal to wake up. A communication terminal comprising: At least one of the authentication response and the attribution response includes second time information indicating a time clocked by the base station,
moreover,
A terminal clock unit that clocks the time;
The communication terminal according to claim 8, further comprising: a terminal correction section that corrects the time measured by the terminal timekeeping section based on the second time information. Furthermore, it is equipped with a terminal clock unit that measures the time.
The communication terminal according to claim 8, wherein the terminal transmitter causes at least one of the authentication request and the attribution request to include third time information indicating a time clocked by the terminal timer. The communication terminal according to any one of claims 8 to 10, wherein the wireless communication conforms to a communication standard in which transmission time per unit time is limited. The communication terminal according to claim 11, wherein the wireless communication conforms to the IEEE802.11ah standard. The wireless communication is based on the IEEE802.11ai standard,
The communication terminal according to claim 11 or 12, wherein the terminal transmitter further includes encrypted data in the attribution request by using an HLP function in the IEEE802.11ai standard. The base station according to any one of claims 1 to 7,
A communication terminal according to any one of claims 8 to 13,
Communications system. A method for controlling a base station that includes a base station transmitter and performs wireless communication with a communication terminal, the method comprising:
receiving at least one of an authentication request and an attribution request for performing the wireless communication transmitted from the communication terminal;
calculating a first time related to a terminal wake-up time at which the communication terminal wakes up when the authentication request is received or when the attribution request is received;
When the base station transmission unit receives the authentication request, it transmits an authentication response to the communication terminal, and when it receives the attribution request, it transmits an attribution response to the communication terminal, and transmits the attribution response and the attribution response to the communication terminal. including first time information indicating the first time in at least one of the attribution responses;
Based on the first time, calculate a base station wake-up time at which the base station transmitter wakes up;
After transmitting the first time information to the communication terminal, the base station transmitter is put into a sleep state,
A control method, wherein when the base station transmitter is in a sleep state, the base station transmitter is woken up when the base station wake-up time comes. A method for controlling a communication terminal that performs wireless communication with a base station, the method comprising:
transmitting at least one of an authentication request and an attribution request for performing the wireless communication to the base station;
Pertains to both a terminal wake-up time at which the communication terminal wakes up and a base station wake-up time at which the base station wakes up, which is transmitted from the base station that received the authentication request and calculated by the base station. receiving at least one of an authentication response including first time information indicating a first time; and an attribution response transmitted from the base station that received the attribution request and including the first time information;
calculating the terminal wake-up time based on the first time;
After calculating the terminal wake-up time, the communication terminal is put into a sleep state, and when the communication terminal is in the sleep state, when the terminal wake-up time is reached, the communication terminal is woken up. A communication method in which a communication terminal and a base station perform wireless communication,
a wireless connection step in which the communication terminal transmits at least one of an authentication request and an attribution request for performing the wireless communication, and the base station transmits at least one of an authentication response and an attribution response;
During the wireless connection step, one of the communication terminal and the base station sends information to the other regarding both the wake-up time of the other and the wake-up time of the other . a first time transmitting step of transmitting one time;
a sleep transition step in which at least a portion of the one and at least a portion of the other transition to a sleep state after the first time transmitting step;
After the sleep transition step, at least a portion of the one and at least a portion of the other are in a sleep state, and when the one wakes up time, at least a portion of the one wakes up and the other wakes up. and a step of waking up at least a portion of the other party when the time comes . A communication method.

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