WO2021039593A1

WO2021039593A1 - Terminal device, communication method, and management device

Info

Publication number: WO2021039593A1
Application number: PCT/JP2020/031482
Authority: WO
Inventors: 和貴高宮; 貴志川田; 洋行中嶋; 保馬鈴木; 一貴萬浪; 隆志清水; 舜過足
Original assignee: 株式会社Ｊｖｃケンウッド
Priority date: 2019-08-30
Filing date: 2020-08-20
Publication date: 2021-03-04

Abstract

A control unit 120 refers to a storage unit 160 and controls a first communication unit 110 so as to carry out a background hunting process for searching for, among a plurality of base station devices, a base station device that is different from a registered base station device and that has a better radio wave environment than the registered base station device. Upon determination that information received from another terminal device by a second communication unit 130 satisfies predetermined conditions, the control unit 120 stops the background hunting process being carried out by the first communication unit 110 and transmits the determined result to the other terminal device.

Description

Terminal device, communication method, management device

The present invention relates to wireless communication technology, and particularly to a terminal device, a communication method, and a management device that execute background hunt.

A background hunt is a condition in which the terminal device is in a steady state after the acquisition of the control channel for communicating with the base station device, that is, in a state where no call is being executed, and the conditions are better than the control channel currently acquired. This is a function that automatically performs tests for acquiring control channels provided by other base station devices on a regular basis. For example, in Patent Document 1, when the terminal device measures the signal strength of the received signal received from the base station device and receives a request to execute the scan process when the measured signal strength is equal to or higher than the reference threshold value. , A technique for performing a scanning process based on the fact that the application is not running is disclosed.

JP-A-2017-76898

However, in Patent Document 1, since the power consumption in the scanning process is not considered, the power consumption of the terminal device may increase.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for reducing power consumption due to background hunting of a terminal device.

In order to solve the above problems, the terminal device of a certain aspect of the present invention has a first communication unit that registers a specific base station device and communicates with the registered base station device using the first wireless communication method. , A second communication unit that communicates with another terminal device using a second wireless communication method different from the first wireless communication method, and a control unit that controls the first communication unit and the second communication unit. A storage unit for storing a list containing information about the base station apparatus of the above. The control unit controls the first communication unit to execute background hunt processing for searching for another base station device having a better radio wave environment than the registered base station device from among a plurality of base station devices, and the other control unit. When it is determined that the information received from the terminal device satisfies a predetermined condition, the background hunt processing is stopped and the second communication unit is controlled to transmit the determined result to another terminal device.

Another aspect of the present invention is a communication method. This method uses a step of registering a specific base station device and communicating with the registered base station device using the first wireless communication method, and a second wireless communication method different from the first wireless communication method. A step of controlling a step of communicating with another terminal device, a step of communicating with a base station device, and a step of communicating with another terminal device, and a step of storing a list containing information about a plurality of base station devices. For the step of communicating with the base station device, a step of executing a background hunt process for searching for another base station device having a better radio environment than the registered base station device from among a plurality of base station devices. , When it is determined that the information received from another terminal device satisfies a predetermined condition, the background hunt processing executed by the step of communicating with the base station device is stopped, and the determination result is transmitted to the other terminal device. It has a step to make it.

Yet another aspect of the present invention is a management device. This device is a management device that manages a plurality of terminal devices and a plurality of base station devices, and receives information about the base station device, position information, and battery level information from each of the plurality of terminal devices. A storage unit that stores a shared list in which information about a base station device, location information, and battery level information are associated with each terminal device, and two or more terminal devices are specified and specified from a plurality of terminal devices. Information on the control unit that selects the hunt execution terminal device that executes background hunt processing on behalf of two or more terminal devices, and the base station device that the specified two or more terminal devices should connect to, and the selected hunt execution. A first unit comprising a notification unit that transmits a shared mode notification including information about a terminal device to two or more specified terminal devices, and a control unit associated with the two or more terminal devices specified in the shared list. When the receiving unit receives information about a second base station device different from that of the base station device, the information indicating the second base station device is transmitted to two or more specified terminal devices. To do.

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

According to the present invention, the power consumption due to the background hunt of the terminal device can be reduced.

It is a figure which shows the structure of the communication system which concerns on Example 1. FIG. It is a figure which shows the structure of the terminal apparatus. It is a sequence diagram which shows the processing procedure in a communication system. It is a flowchart which shows the sharing possibility determination procedure by the 1st terminal apparatus. It is a flowchart which shows another sharing possibility determination procedure by a 1st terminal apparatus. It is a flowchart which shows the hunt execution terminal determination procedure by the 2nd terminal apparatus. It is a flowchart which shows another hunt execution terminal determination procedure by the 2nd terminal apparatus. It is a sequence diagram which shows the processing procedure in the communication system which concerns on Example 2. It is a figure which shows the structure of the communication system which concerns on Example 3. FIG. It is a figure which shows the structure of the terminal apparatus. It is a figure which shows the structure of the management device. It is a sequence diagram which shows the 1st processing procedure in a communication system. It is a figure which shows the data structure of the shared list stored in the storage part of FIG. It is a sequence diagram which shows the 2nd processing procedure in a communication system. It is a figure which shows the data structure of the shared list stored in the storage part of FIG. It is a sequence diagram which shows the 3rd processing procedure in a communication system. It is a figure which shows the data structure of the shared list stored in the storage part of FIG. It is a sequence diagram which shows the 4th processing procedure in a communication system. It is a figure which shows the data structure of the shared list stored in the storage part of FIG. It is a sequence diagram which shows the 5th processing procedure in a communication system.

(Example 1)
Before explaining the present invention in detail, first, an outline will be given. An embodiment of the present invention relates to a communication system including a plurality of base station devices and a plurality of terminal devices. The terminal device includes a short-range wireless communication function such as Bluetooth (registered trademark) and BLE (Bluetooth Low Energy), and a long-range wireless communication function such as a commercial wireless or a mobile phone network. The terminal device is connected to the base station device by performing location registration on one base station device, and performs communication by long-distance wireless communication. This state is said to be within the range of the location registration state of the terminal device with respect to the base station device. Under such circumstances, the terminal device searches for another base station device capable of receiving the control channel by performing a background hunt.

In order to reduce power consumption in such a background hunt, the terminal device exchanges battery level information with the other terminal device by communicating with the other terminal device by short-range wireless communication. To do. When the terminal device determines that the predetermined condition is satisfied, that is, when it is determined that the remaining battery level of the other terminal device is higher, the other terminal device is requested to execute the background hunt, and another terminal device is requested to execute the background hunt. Share background hunt results with your device. The terminal device reduces power consumption by stopping processing while the other terminal device is performing a background hunt.

FIG. 1 shows the configuration of the communication system 1000. The communication system 1000 includes a first terminal device 100a and a second terminal device 100b collectively referred to as a terminal device 100, and a first base station device 200a, a second base station device 200b, and a third base station device 200b collectively referred to as a base station device 200. Includes base station equipment 200c. The number of terminal devices 100 included in the communication system 1000 is not limited to "2", and the number of base station devices 200 is not limited to "3". Each base station device 200 can communicate with the terminal device 100 by executing a process of long-distance wireless communication. The area in which communication with the base station device 200 is possible is the communication area 300. The first communication area 300a is formed by the first base station apparatus 200a, the second communication area 300b is formed by the second base station apparatus 200b, and the third communication area 300c is formed by the third base station apparatus 200c. Further, the identification information for identifying the base station device 200 is a "site ID". For example, the first base station device 200a is given a site ID "1" and the second base station device 200b is given a site ID. "2" is assigned, and the site ID "3" is assigned to the third base station apparatus 200c. In the communication system 1000, a network ID is defined together with a site ID.

The identification information assigned to each of a plurality of systems or a plurality of businesses included in the communication system 1000 is a "network ID". When the network ID of the first base station device 200a to the third base station device 200c in FIG. 1 is "1", the first base station device 200a to the third base station device 200c are included in the same system. On the other hand, when the network IDs of the first base station apparatus 200a and the second base station apparatus 200b are "1" and the network ID of the third base station apparatus 200c is "2", the first base station apparatus 200a and The system including the second base station apparatus 200b and the system including the third base station apparatus 200c are different. A network ID for a connectable system is set in the terminal device 100. When the network ID set in the terminal device 100 is "1", the terminal device 100 can be connected to the first base station device 200a and the second base station device 200b. On the other hand, the terminal device 100 cannot be connected to the third base station device 200c. The terminal device 100 executes location registration for the connected base station device 200.

FIG. 2 shows the configuration of the terminal device 100. The terminal device 100 includes a first communication unit 110, a control unit 120, a second communication unit 130, a battery 140, and a storage unit 160. The terminal device 100 corresponds to the first terminal device 100a and the second terminal device 100b in FIG. The first communication unit 110 communicates with the location-registered base station apparatus 200 by registering the location with respect to any one of the plurality of base station apparatus 200 by long-distance wireless communication. Since a known technique may be used for location registration and communication, description thereof will be omitted here.

When the terminal device 100 is located in the base station device 200, the control unit 120 causes the first communication unit 110 to perform a background hunt process for searching for another base station device 200 capable of registering the location. As described above, the background hunt process is performed in order to acquire a control channel having better communication conditions than the currently acquired control channel while waiting in a steady state after the control channel is acquired. The communication condition is a radio wave environment such as the electric field strength of radio waves received from a base station. The background hunt process is a handover function that enables the terminal device 100 to move across the plurality of base station devices 200 and communicate between different base station devices 200 in the communication system 1000 including the plurality of base station devices 200. It is provided as a part of.

When the electric field strength of the receiving control channel is weakened by moving the terminal device 100 away from the base station device 200, there is a base station device 200 having a better radio wave environment than the current base station device 200. there's a possibility that. Therefore, the background hunt process periodically searches for another base station device 200 even after the location registration is completed, providing a good radio wave environment. When executing the background hunt process, the first communication unit 110 uses the background hunt list set in the storage unit 160 in advance. In the background hunt list, a site ID and a control channel number (control CH No.) are registered for each base station device 200 to be searched. When the control unit 120 receives the adjacent site information transmitted from the base station apparatus 200 on the control channel, the control unit 120 stores up to 16 adjacent site information as the adjacent site channel information in the storage unit 160 and uses it as a background hunt list. You may. In this embodiment, the maximum number of adjacent site channel information stored in the storage unit 160 is 16, but the maximum number may be set according to the scale of the communication system 1000, the specifications of the terminal device 100, and the like.

The second communication unit 130 can communicate with another terminal device 100 by executing short-range wireless communication. When the long-distance wireless communication is called the first wireless communication method, the short-range wireless communication is called the second wireless communication method. The battery 140 drives the terminal device 100.

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

Hereinafter, the processing in the terminal device 100 of FIG. 2 will be described with reference to FIGS. 3 to 7. FIG. 3 is a sequence diagram showing a processing procedure in the communication system 1000. Here, it is assumed that the remaining battery level of the first terminal device 100a is 50% and the remaining battery level of the second terminal device 100b is 90%. Further, it is assumed that the first terminal device 100a and the second terminal device 100b exist in the first communication area 300a. Further, the first terminal device 100a and the second terminal device 100b are connected to the same network.

When the power of the first terminal device 100a is turned on, the first communication unit 110 of the first terminal device 100a searches for the base station device 200 whose location can be registered, and the first base station device 200a having the best radio wave environment. The site ID of the first base station device 200a is stored in the storage unit 160, and the background hunt is turned on (S10). The second communication unit 130 of the first terminal device 100a searches for another terminal device 100 capable of short-range wireless communication within a predetermined distance range (S12).

When the power of the second terminal device 100b is turned on, the first communication unit 110 of the second terminal device 100b searches for the base station device 200 whose location can be registered, and the second base station device 200b having the best radio wave environment. The site ID of the second base station device 200b is stored in the storage unit 160, and the background hunt is turned on (S14). The second communication unit 130 of the second terminal device 100b searches for another terminal device 100 capable of short-range wireless communication within a predetermined distance range (S16).

The second communication unit 130 of the first terminal device 100a and the second communication unit 130 of the second terminal device 100b start short-range wireless communication (S18). The second communication unit 130 of the second terminal device 100b requests the first terminal device 100a to share the background hunt by using short-range wireless communication according to the instruction of the control unit 120 (hereinafter, "hunt sharing"). "Request message") is transmitted (S20). This request message includes information on the network ID of the second terminal device 100b.

The control unit 120 of the first terminal device 100a determines whether or not background hunt sharing is possible based on the received hunt sharing request message (hereinafter referred to as "sharing availability determination") (S22). FIG. 4 is a flowchart showing a sharing possibility determination procedure by the first terminal device 100a. The control unit 120 of the first terminal device 100a determines the position registration state of the first terminal device 100a. When the position registration state is in the range state (Y in S100), the control unit 120 proceeds to step 102, and when the position registration state is not in the range state (N in S100), the control unit 120 proceeds to step 112. The control unit 120 compares the network ID of the first terminal device 100a with the network ID of the second terminal device 100b included in the hunt sharing request message. If the comparison results match (Y in S102), the control unit 120 proceeds to step 104. If the comparison results do not match (N in S102), the control unit 120 proceeds to step 112.

The control unit 120 acquires the remaining battery level of the first terminal device 100a (S104). The control unit 120 acquires the site ID of the base station device 200 whose current position is registered from the storage unit 160 (S106). The control unit 120 uses the control CH No. of the background hunt list of the first terminal device 100a. (S108). The control unit 120 provides a response (hereinafter, referred to as “permission hunt sharing response message”) indicating that background hunt sharing is possible while including the information acquired in steps 104 to 108. It is transmitted from 130 to the second terminal device 100b (S110). This corresponds to permitting background hunt sharing when the identification information of the system including the first terminal device 100a and the identification information of the system including the second terminal device 100b are common. In step 112, the control unit 120 transmits a response (hereinafter referred to as “unauthorized hunt sharing response message”) indicating that background hunt sharing is not possible from the second communication unit 130 to the second terminal device 100b. (S112).

FIG. 5 is a flowchart showing another sharing possibility determination procedure by the first terminal device 100a. In this case, each terminal device 100 includes an acquisition unit (not shown), and the acquisition unit acquires the position information of the terminal device 100. The acquisition unit acquires position information by, for example, GPS (Global Positioning System). Further, the hunt sharing request message transmitted from the second terminal device 100b includes the position information of the second terminal device 100b. The control unit 120 of the first terminal device 100a acquires the position information of the first terminal device 100a from the acquisition unit, and acquires the position information of the second terminal device 100b from the hunt sharing request message.

The control unit 120 calculates the distance between the first terminal device 100a and the second terminal device 100b from these position information. When the distance is equal to or less than the threshold value (Y in S150), the control unit 120 proceeds to step 152. If the distance is not less than or equal to the threshold (N in S150), the control unit 120 proceeds to step 164. Since steps 152 to 164 are the same as steps 100 to 112 in FIG. 4, description thereof will be omitted here. That is, in the process of FIG. 5, in addition to the process of FIG. 4, when the distance between the position information of the first terminal device 100a and the position information of the second terminal device 100b is equal to or less than the threshold value, the background is backed up. It can be said that ground hunt sharing is permitted. Return to FIG. In this embodiment, it is assumed that background hunt sharing is permitted.

The second communication unit 130 of the first terminal device 100a sends a permission hunt sharing response message including the remaining battery level, the control CH No. registered in the background hunt list, and the site ID registered at the current location. 2 Transmission to the terminal device 100b (S24). The control unit 120 of the second terminal device 100b determines the terminal device 100 to execute the background hunt based on the received permission hunt sharing response message (hereinafter, referred to as “hunt execution terminal determination”) (S26). ). In the hunt execution terminal determination, it is selected whether the first terminal device 100a executes the background hunt or the second terminal device 100b executes the background hunt.

FIG. 6 is a flowchart showing a hunt execution terminal determination procedure by the second terminal device 100b. The control unit 120 of the second terminal device 100b receives a hunt shared response message from the second communication unit 130 (S200). The control unit 120 proceeds to step 204 when the hunt shared response message is permitted (Y in S202), and proceeds to step 218 when the hunt shared response message is not permitted (N in S202). When the site ID of the first terminal device 100a and the site ID registered in the location of the second terminal device 100b in the hunt shared response message match (Y in S204), the control unit 120 proceeds to step 208. On the other hand, when the site ID of the first terminal device 100a and the site ID registered in the location of the second terminal device 100b do not match in the hunt shared response message, the control unit 120 proceeds to step 206 (N in S204). .. In order for the control unit 120 to register the location of the first terminal device 100a and the second terminal device 100b in the same base station device 200, the control unit 120 has the site ID of the base station device 200 whose location is registered by the second terminal device 100b (hereinafter referred to as , "Registration request") is transmitted from the second communication unit 130 to the first terminal device 100a (S206). Upon receiving this, the first terminal device 100a registers the location in the base station device 200 of the site ID registered in the location of the second terminal device 100b, and updates the site ID of the storage unit 160. As a result, the first terminal device 100a and the second terminal device 100b are registered in the same base station device 200. Following this, the process proceeds to step 208.

The control unit 120 acquires the remaining battery level (S208). The control unit 120 proceeds to step 212 when the remaining battery level of the first terminal device 100a is not larger than the acquired remaining battery level (N in S210). That is, when the acquired remaining battery level is equal to or greater than the remaining battery level of the first terminal device 100a, the control unit 120 proceeds to step 212. When the remaining battery level of the first terminal device 100a is larger than the acquired remaining battery level (Y in S210), the control unit 120 proceeds to step 214. Here, as the remaining battery level, the time until the battery reaches 0% may be compared, or the current remaining battery level may be used. The control unit 120 determines that the second terminal device 100b executes the background hunt process (S212). In step 214, the control unit 120 determines that the first terminal device 100a executes the background hunt process (S214). The second communication unit 130 transmits a notification including the determination result (hereinafter, referred to as “hunt execution terminal determination result notification”) to the first terminal device 100a (S216). The control unit 120 ends the background hunt sharing process and starts the normal background hunt process (S218). In this way, when the remaining amount of the battery 140 of the terminal device 100 is less than the remaining amount of the battery 140 of the other terminal device 100, the control unit 120 performs a background hunt process on the other terminal device 100. Let it run. It should be noted that the determination method when the remaining batteries are the same may be determined in advance, for example, by comparing the identification number of the terminal device 100 or the priority set for each terminal device.

FIG. 7 is a flowchart showing another hunt execution terminal determination procedure by the second terminal device 100b. Since steps 250 to 256 are the same as steps 200 to 206 in FIG. 6, description thereof will be omitted here. The control unit 120 calculates the remaining battery level per hour until the scheduled operation end time from the information of the remaining battery level of the second terminal device 100b and the scheduled operation end time of the second terminal device 100b (S258). This can be said to be the remaining battery level per unit time for the second terminal device 100b. For example, if the current time is 15:00, the scheduled end time of operation is 18:00, and the remaining battery level is 60%, the remaining battery level per unit time until the scheduled end time of operation is 20%. is there. Information on the scheduled operation end time may be stored in the storage unit 160 in advance and referred to by the control unit 120, or the base station device 200 manages the work data and associates it with the user ID of the terminal device 100. The base station device 200 may notify the terminal device 100.

The control unit 120 calculates the remaining battery level per hour until the scheduled operation end time from the information of the remaining battery level of the first terminal device 100a and the scheduled operation end time of the first terminal device 100a (S260). This can be said to be the remaining battery level per unit time for the first terminal device 100a. Information on the scheduled end time of the operation is included in, for example, the hunt sharing response message.
Since steps 262 to 270 are the same as steps 210 to 218 of FIG. 6, description thereof will be omitted here. In this way, the control unit 120 derives the remaining amount per unit time for the battery 140 based on the remaining amount of the battery 140 and the scheduled operation period of the terminal device 100. Further, when the remaining amount per unit time for the battery 140 is less than the remaining amount per unit time for the other terminal device 100, the control unit 120 causes the other terminal device 100 to execute the background hunt process. .. Return to FIG.

The second communication unit 130 of the second terminal device 100b transmits the hunt execution terminal determination result notification to the first terminal device 100a by short-range wireless communication (S28). Since the remaining battery level of the first terminal device 100a is less than the remaining battery level of the second terminal device 100b, it is indicated in the hunt execution terminal determination result notification that the second terminal device 100b executes the background hunt process. It shall be. The control unit 120 of the first terminal device 100a turns on the background hunt sharing mode and turns off the background hunt for the first communication unit 110 (S30). On the other hand, the second terminal device 100b turns on the background hunt sharing mode and does not turn off the background hunt for the first communication unit 110 (S32).

The control unit 120 of the second terminal device 100b executes the background hunt process by combining the background hunt list of the second terminal device 100b and the background hunt list of the first terminal device 100a included in the hunt sharing response message. To do. The background hunt process is performed, for example, as follows.
In Specific Example 1, the control CH Nos registered in the background hunt list of the first terminal device 100a are 1 to 10, and the control CH Nos registered in the background hunt list of the second terminal device 100b are 1. It is assumed that the number is ~ 10. In this case, the control unit 120 of the second terminal device 100b targets the control CH Nos. 1 to 10 for the background hunt while the background hunt sharing mode is on.
In Specific Example 2, the control CH Nos registered in the background hunt list of the first terminal device 100a are 1 to 5, and the control CH Nos registered in the background hunt list of the second terminal device 100b are 1. It is assumed that the number is ~ 10. In this case, the control unit 120 of the second terminal device 100b targets the control CH Nos. 1 to 10 for the background hunt while the background hunt sharing mode is on.
In Specific Example 3, the control CH Nos registered in the background hunt list of the first terminal device 100a are 1 to 5, and the control CH Nos registered in the background hunt list of the second terminal device 100b are 6. It is assumed that the number is ~ 10. In this case, the control unit 120 of the second terminal device 100b targets the control CH Nos. 1 to 10 for the background hunt while the background hunt sharing mode is on.

The second communication unit 130 of the second terminal device 100b transmits the background hunt search result (hereinafter referred to as “hunt search result notification”) to the first terminal device 100a by short-range wireless communication at predetermined time intervals (S34). , S36). For example, a hunt search result notification is transmitted to the second terminal device 100b at a time interval (preset value) of a preset value. As the predetermined time interval, a value preset in each terminal device 100 may be used. When the preset value of the first terminal device 100a and the preset value of the second terminal device 100b are different, the preset value of the second terminal device 100b that operates the background hunt may be used. Alternatively, the preset value of the first terminal device 100a and the preset value of the second terminal device 100b may be compared and a shorter value may be used. In that case, the hunt shared response message must include a preset value.

The control unit 120 of the second terminal device 100b discovers the second base station device 200b by background hunt processing (S38). The second communication unit 130 of the second terminal device 100b transmits the determination result of finding the second base station device 200b to the first terminal device 100a by short-range wireless communication as a hunt search result notification (S40). The first terminal device 100a and the second terminal device 100b are registered in the second base station device 200b (S42, S44). The second terminal device 100b receives a power-off operation (S46). The second communication unit 130 of the second terminal device 100b transmits a notification for canceling the background hunt sharing mode (hereinafter, referred to as “hunt sharing mode cancellation notification”) to the first terminal device 100a by short-range wireless communication. (S48). The short-range wireless communication connection between the first terminal device 100a and the second terminal device 100b is terminated (S50). The first terminal device 100a turns off the background hunt sharing mode and turns on the background hunt (S52). The power of the second terminal device 100b is turned off (S54). In this way, the first terminal device 100a communicates with the second terminal device 100b using short-range wireless communication, and when a predetermined condition is satisfied, the second terminal device 100b is made to execute the background hunt process. , The execution of the background hunt process in the first terminal device 100a is stopped.

According to this embodiment, the terminal device communicates with another terminal device, and when a predetermined condition is satisfied, the other terminal device is made to execute the background hunt process and executes its own background hunt process. Since it is stopped, the power consumption due to the background hunt can be reduced. Further, when the system ID of the terminal device and the system ID of the other terminal device are common, the background hunt process is executed for the other terminal device, so that the same base station device can be connected. Background hunt processing can be shared by one terminal device.

Further, when the distance between the position information of the terminal device and the position information of the other terminal device is equal to or less than the threshold value, the background hunt process is executed for the other terminal device, so that the other terminal Background hunt processing can be shared when the device is near the terminal device. Further, when the remaining battery level of the terminal device is less than the remaining battery level of the other terminal device, the background hunt process is executed for the other terminal device, so that the remaining battery level of the terminal device is executed. Can be suppressed. Further, when the remaining amount per unit time for the terminal device is smaller than the remaining amount per unit time for the other terminal device, the background hunt processing is executed for the other terminal device, so that the terminal device is executed. It is possible to suppress the decrease in the remaining amount of the battery.

(Example 2)
Next, Example 2 will be described. The second embodiment relates to a communication system including a plurality of base station devices and a plurality of terminal devices, as in the first embodiment. In the first embodiment, the background hunt process is shared by the two terminal devices connected to the same base station device. On the other hand, in the second embodiment, it is assumed that the two terminal devices are connected to different base station devices. This corresponds to the case where step 204 in FIG. 6 is N and the case where step 254 in FIG. 7 is N. The communication system 1000 and the terminal device 100 according to the second embodiment are of the same type as those in FIGS. 1 and 2. Here, the differences from the past will be mainly described.

FIG. 8 is a sequence diagram showing a processing procedure in the communication system 1000. Here, it is assumed that the remaining battery level of the first terminal device 100a is 50% and the remaining battery level of the second terminal device 100b is 90%. Further, it is assumed that the first terminal device 100a and the second terminal device 100b exist in an area where the first communication area 300a, the second communication area 300b, and the third communication area 300c overlap. Further, the first terminal device 100a and the second terminal device 100b are connected to the same network.

When the power of the first terminal device 100a is turned on, the first communication unit 110 of the first terminal device 100a searches for the base station device 200 whose location can be registered, and the first base station device 200a having the best radio wave environment. The location is registered in and the background hunt is turned on (S300). The second communication unit 130 of the first terminal device 100a searches for another terminal device 100 capable of short-range wireless communication within a predetermined distance range (S302).

When the power of the second terminal device 100b is turned on, the first communication unit 110 of the second terminal device 100b searches for the base station device 200 whose location can be registered, and the second base station device 200b having the best radio wave environment. The location is registered in and the background hunt is turned on (S304). The second communication unit 130 of the second terminal device 100b searches for another terminal device 100 capable of short-range wireless communication within a predetermined distance range (S306).

The second communication unit 130 of the first terminal device 100a and the second communication unit 130 of the second terminal device 100b start short-range wireless communication (S308). The second communication unit 130 of the second terminal device 100b transmits a hunt sharing request message to the first terminal device 100a using short-range wireless communication according to the instruction of the control unit 120 (S310). The control unit 120 of the first terminal device 100a executes a sharing possibility determination based on the received hunt sharing request message (S312). The sharing possibility determination is made as shown in FIG. 4 or FIG. 5 as before. In this embodiment, it is assumed that background hunt sharing is permitted.

The second communication unit 130 of the first terminal device 100a sends a permission hunt sharing response message including the remaining battery level, the control CH No. registered in the background hunt list, and the site ID registered at the current location. 1 Transmission to the terminal device 100a (S314). The control unit 120 of the second terminal device 100b executes the hunt execution terminal determination based on the received permission hunt sharing response message (S316). The hunt execution terminal determination is performed as shown in FIG. 6 or 7 as before. At that time, steps 210 to 214 in FIG. 6 or steps 262 to 266 in FIG. 7 are executed. The second communication unit 130 of the second terminal device 100b transmits a registration request and a hunt execution terminal determination result notification to the first terminal device 100a by short-range wireless communication (S318). It is assumed that the registration request indicates that the location is registered in the second base station apparatus 200b. Further, since the remaining battery level of the first terminal device 100a is smaller than the remaining battery level of the second terminal device 100b, it is indicated in the hunt execution terminal determination result notification that the second terminal device 100b executes the background hunt process. It shall be indicated.

The first communication unit 110 of the first terminal device 100a registers the location in the second base station device 200b based on the site ID indicated in the registration request (S320). As a result, the first terminal device 100a and the second terminal device 100b are registered in the same base station device 200. The second communication unit 130 of the first terminal device 100a transmits a notification of the completion of location registration (hereinafter referred to as “registration completion notification”) to the second terminal device 100b by short-range wireless communication (S322). Since steps 324 to 348 are the same as steps 30 to 54, description thereof will be omitted here. In this way, when the base station devices 200 in which the positions of the two terminal devices 100 are registered are different from each other, the base station devices 200 in which the positions of the two terminal devices 100 are registered are shared, and then the other terminal devices 100 are used. Is made to execute background hunt processing.

According to this embodiment, when the base station device in which this terminal device is registered and the base station device in which other terminal devices are registered are different, these base station devices are shared and then the other. Since the background hunt processing is executed for the terminal device of the above, the processing can be simplified.

(Example 3)
Next, Example 3 will be described. The third embodiment relates to a communication system including a plurality of base station devices and a plurality of terminal devices as before. So far, two terminal devices have exchanged battery remaining amount information with each other by short-range wireless communication, so that one terminal device executes background and the other terminal device stops processing. Also, the background hunt results are shared between the two terminals. As the number of terminals that should share the results of a background hunt increases, the terminal that performs the background hunt must perform short-range wireless communication individually with a plurality of other terminals. As a result, the power consumption of the terminal device that executes the background hunt increases. Further, a terminal device that does not have a short-range wireless communication function cannot perform such processing. In the communication system according to the third embodiment, a plurality of base station devices are connected to the management device, and the management device among the plurality of terminal devices should execute the background hunt (hereinafter, "hunt execution"). "Terminal device") is selected. Here, the differences from the past will be mainly described.

FIG. 9 shows the configuration of the communication system 1000. The communication system 1000 includes a first terminal device 100a to a fifth terminal device 100e collectively referred to as a terminal device 100, a first base station device 200a to a third base station device 200c collectively referred to as a base station device 200, and a management device 400. Including. The number of terminal devices 100 included in the communication system 1000 is not limited to "5", and the number of base station devices 200 is not limited to "3". Each base station device 200 can communicate with the terminal device 100 by executing a process of long-distance wireless communication. The area in which communication with the base station device 200 is possible is the communication area 300. The first communication area 300a is formed by the first base station apparatus 200a, the second communication area 300b is formed by the second base station apparatus 200b, and the third communication area 300c is formed by the third base station apparatus 200c.

Here, the first terminal device 100a, the second terminal device 100b, the third terminal device 100c, and the fifth terminal device 100e are located in the proximity area 350, and the fourth terminal device 100d is not located in the proximity area 350. The proximity area 350 is an area having a size that allows them to be regarded as the same position, that is, a background hunt that can be shared. The size of the proximity area 350 may be predetermined, for example, a radius of 10 m. In such a configuration, the "site ID" and the "network ID" are defined as before. The management device 400 is connected to a plurality of base station devices 200, and is also connected to a plurality of terminal devices 100 via each base station device 200. As a result, the management device 400 manages the plurality of terminal devices 100 and the plurality of base station devices 200.

FIG. 10 shows the configuration of the terminal device 100. The terminal device 100 includes a control unit 120, a battery 140, a storage unit 160, a communication unit 170, and a positioning unit 180. The control unit 120, the battery 140, and the storage unit 160 are also shown in FIG. 2, but the differences thereof will be described below. The communication unit 170 corresponds to the first communication unit 110 in FIG. 2, and the location is registered by registering the location with respect to the base station device 200 of the plurality of base station devices 200 by long-distance wireless communication. Communicates with the base station device 200. The positioning unit 180 corresponds to the global positioning system (Global Navigation Satellite System, GNSS), and periodically positions the position of the terminal device 100. Since a known technique may be used for positioning the position, the description thereof will be omitted here. The positioning unit 180 outputs the positioned position information to the control unit 120.

FIG. 11 shows the configuration of the management device 400. The management device 400 includes a communication unit 410, a control unit 420, and a storage unit 430. Further, the communication unit 410 includes a reception unit 412 and a notification unit 414, and the control unit 420 includes a specific unit 422 and a selection unit 424. The communication unit 410 is connected to the plurality of base station devices 200 in FIG. 9 and communicates with the plurality of base station devices 200. Further, the communication unit 410 communicates with a plurality of terminal devices 100 via each base station device 200. In the following, the configuration of the management device 400 and the configuration of the terminal device 100 in the communication system 1000 will be described with reference to FIGS. 12 to 20.

FIG. 12 is a sequence diagram showing a first processing procedure in the communication system 1000. The first processing procedure corresponds to preprocessing before executing the background hunt. The first terminal device 100a to the third terminal device 100c and the fifth terminal device 100e exist at the point pX (S10, S12, S14, S18), and the fourth terminal device 100d exists at the point pY (S16). Here, the point pX is a general term for the positions included in the proximity area 350 in FIG. 9, and the point pY is a general term for another position not included in the proximity area 350. Therefore, it can be said that the first terminal device 100a, the second terminal device 100b, the third terminal device 100c, and the fifth terminal device 100e exist within a sufficiently close distance range for sharing the background hunt. Further, the fourth terminal device 100d does not exist within a distance range sufficiently close to share the background hunt with the first terminal device 100a, the second terminal device 100b, the third terminal device 100c, and the fifth terminal device 100e. It can be said that.

The remaining amount of the battery 140 of the first terminal device 100a is 100% (S20), the remaining amount of the battery 140 of the second terminal device 100b is 50% (S22), and the remaining amount of the battery 140 of the third terminal device 100c. The amount is 10% (S24). The remaining amount of the battery 140 of the fourth terminal device 100d is 70% (S26), and the remaining amount of the battery 140 of the fifth terminal device 100e is 90% (S28). The first terminal device 100a to the fourth terminal device 100d have a background hunt function, and the background hunt is enabled in the first terminal device 100a to the fourth terminal device 100d (S30, S32, S34, S36). The fifth terminal device 100e does not have a background hunt function, and the background hunt is disabled in the fifth terminal device 100e (S38).

Under the preconditions shown in steps 10 to 38, the power of the first terminal device 100a to the fifth terminal device 100e is turned on (S40, S42, S44, S46, S48). The first terminal device 100a, the second terminal device 100b, the fourth terminal device 100d, and the fifth terminal device 100e are registered in the first base station device 200a with the site ID "1" (S50, S52, S56, S58). .. The third terminal device 100c is registered in the second base station device 200b with the site ID "2" (S54). The first terminal device 100a, the second terminal device 100b, the third terminal device 100c, and the fourth terminal device 100d corresponding to the background function start the background hunt (S60, S62, S64, S66).

The management device 400 stores the registration information of each terminal device 100 in the storage unit 430 as a shared list. In the shared list, each terminal device 100 is associated with a site ID indicating a base station device 200 to be connected, location information, and battery level information. When the registration information of each terminal device 100 changes, the management device 400 updates the registration information of each terminal device 100 in the sharing list, and determines whether or not there is a terminal device 100 capable of background hunt sharing (S68). FIG. 13 shows the data structure of the shared list stored in the storage unit 430. In this situation, since the management device 400 has not acquired the position information and the battery remaining amount information of each terminal device 100, it is determined that the terminal device 100 that can share the background hunt does not exist.

FIG. 14 is a sequence diagram showing a second processing procedure in the communication system 1000. This corresponds to the control process until the background hunt sharing is started. The control unit 120 of the first terminal device 100a periodically generates information including the position information of the own terminal device and the remaining battery level information of the own terminal device (hereinafter, referred to as "terminal information periodic report"), and communicates with them. The unit 170 periodically transmits a terminal information periodic report (S100). The terminal information periodic report is transmitted to the management device 400 via the first base station device 200a. Here, pX is included as the position information, and 100% is included as the battery remaining amount information.

The communication unit 170 of the second terminal device 100b also transmits the terminal information periodic report to the communication unit 170 of the fourth terminal device 100d (S102, S104, S106). The terminal information periodic report from the second terminal device 100b includes pX as the location information and 50% as the battery remaining amount information, and the terminal information periodic report from the third terminal device 100c includes the location information as the location information. pX is included, and 10% is included as battery level information. The terminal information periodic report from the fourth terminal device 100d includes pY as the position information and 70% as the battery remaining amount information. The time from the notification of the terminal information periodic report to the next notification of the terminal information periodic report is set to a predetermined time, and the predetermined time follows the setting of each terminal device 100. On the other hand, the communication unit 170 of the fifth terminal device 100e that does not execute the background hunt does not transmit the terminal information periodic report.

The receiving unit 412 of the management device 400 receives the terminal information periodic report from each of the plurality of terminal devices 100. Upon receiving the terminal information periodic report, the control unit 420 updates the shared list of the storage unit 430 and determines whether or not the terminal device 100 capable of background hunt sharing exists (S108). For example, the identification unit 422 sets the proximity area 350 based on the point pX where the first terminal device 100a exists, and identifies the second terminal device 100b and the third terminal device 100c existing in the proximity area 350. The identification unit 422 identifies the first terminal device 100a, the second terminal device 100b, and the third terminal device 100c as a group capable of sharing a background hunt. This corresponds to specifying two or more terminal devices 100 that are within a predetermined distance from each other as a group from among a plurality of terminal devices 100 based on the position information, and is predetermined to each other specified here. Two or more terminal devices 100 within the distance of can be said to be terminal devices 100 belonging to the group.

The selection unit 424 selects a hunt execution terminal device that executes background hunt processing on behalf of two or more terminal devices 100 included in the group based on the remaining battery level information of the terminal device 100 included in the group. select. Specifically, the terminal device 100 having the highest remaining battery power is selected as the hunt execution terminal device. Here, the first terminal device 100a is selected as the hunt execution terminal device. Alternatively, based on the remaining battery level information of each terminal device 100 included in the group, each terminal device 100 acquires the sustainable time in which the terminal device 100 can continuously operate, and the terminal device 100 having the longest sustainable time is used as the hunt execution terminal device. It may be selected. Further, the sustainable time may be calculated based on the battery remaining amount information and the current consumption of each terminal device 100 included in the group. By doing so, even if the remaining battery level is the same, a different sustainable time is acquired for each terminal device 100, so that the hunt execution terminal device can be selected more accurately.

Here, the control unit 420 has a site ID "1" so that the first terminal device 100a, the second terminal device 100b, and the third terminal device 100c included in the group can be registered in the base station device 200 having the same site ID. It is decided to be registered in the first base station apparatus 200a. Based on these determination results and selection results, the management device 400 updates the shared list stored in the storage unit 430. FIG. 15 shows the data structure of the shared list stored in the storage unit 430. Here, the position information and the battery remaining amount information are stored for each terminal device. Return to FIG.

The control unit 420 of the management device 400 includes information including the identification ID of the hunt execution terminal device, that is, the terminal device 100 that operates the background hunt, and the site ID registered in the sharing mode (hereinafter, “sharing mode start””. ) Is generated. This is a shared mode including information indicating the base station device 200 to be connected to two or more terminal devices 100 included in the group among the plurality of base station devices 200, and information indicating the hunt execution terminal device. Corresponds to generating a start. For example, the "identification ID of the terminal that operates the background hunt" is the first terminal device 100a, and the "site ID registered in the sharing mode" is the first base station device 200a of the site ID "1". The notification unit 414 transmits the start of the shared mode to the first terminal device 100a, the second terminal device 100b, and the third terminal device 100c included in the group (S110, S112, S114). The start of shared mode is included in the shared mode notification.

The communication unit 170 of the first terminal device 100a, the communication unit 170 of the second terminal device 100b, and the communication unit 170 of the third terminal device 100c receive the start of the shared mode. Since the site ID of the base station device 200 currently registered in the control unit 120 of the third terminal device 100c is different from the site ID included in the start of the shared mode, the site ID "1" included in the start of the shared mode Is registered in the first terminal device 100a (S116). The control unit 120 of the second terminal device 100b stops the background hunt process because the hunt execution terminal device included in the start of the shared mode is different from the second terminal device 100b (S118). The control unit 120 of the third terminal device 100c stops the background hunt process because the hunt execution terminal device included in the start of the shared mode is different from the third terminal device 100c (S120).

The control unit 120 of the first terminal device 100a, the control unit 120 of the second terminal device 100b, and the control unit 120 of the third terminal device 100c start the background sharing mode (S122, S124, S126). The control unit 120 of the first terminal device 100a executes the background hunt process because the hunt execution terminal device included in the start of the shared mode is the first terminal device 100a. In the background hunt process, a base station device 200 different from the base station device 200 indicated at the start of the shared mode is searched from among the plurality of base station devices 200. The communication unit 170 of the first terminal device 100a, the communication unit 170 of the second terminal device 100b, and the communication unit 170 of the third terminal device 100c report the terminal information periodically at predetermined time intervals even in the background sharing mode. Transmit (S128, S130, S132).

FIG. 16 is a sequence diagram showing a third processing procedure in the communication system 1000. This corresponds to the process of sharing background hunt information. The control unit 120 of the first terminal device 100a, which is a hunt execution terminal device, executes the background hunt process during the background hunt sharing. For example, the control unit 120 discovers the third base station device 200c having the site ID “3”, which has better conditions than the first base station device 200a having the site ID “1” (S200). The control unit 120 of the first terminal device 100a generates information (hereinafter, referred to as “site acquisition notification”) for notifying that the third base station device 200c having the site ID “3” has been found, and the communication unit 170 generates information. The site acquisition notification is transmitted to the management device 400 (S202).

The receiving unit 412 of the management device 400 receives the site acquisition notification from the first terminal device 100a. This corresponds to receiving information indicating another base station device 200 different from the registered base station device 200 from the hunt execution terminal device. The control unit 420 updates the shared list stored in the storage unit 430 so as to change the registration destination to the newly discovered base station device 200 according to the site acquisition notification (S204). FIG. 17 shows the data structure of the shared list stored in the storage unit 430. The site ID of the shared list is changed to "3". Return to FIG. The control unit 420 generates information (hereinafter referred to as “site change request”) indicating the third base station device 200c of the newly discovered site ID “3”, and the notification unit 414 uses the first terminal device 100a, A site change request is transmitted to the second terminal device 100b and the third terminal device 100c (S206, S208, S210). Site change requests are included in shared mode notifications.

The communication unit 170 of the first terminal device 100a, the communication unit 170 of the second terminal device 100b, and the communication unit 170 of the third terminal device 100c receive the site change request. The control unit 120 of the first terminal device 100a, the control unit 120 of the second terminal device 100b, and the control unit 120 of the third terminal device 100c are from the first base station device 200a of the site ID "1" to the site ID "3". The registration is changed to the third base station device 200c (S212, S214, S216). As a result, the second terminal device 100b and the third terminal device 100c can be registered in the base station device 200 with a good site ID found by the first terminal device 100a in the background hunt. This is shown in the site change request in the second terminal device 100b and the third terminal device 100c when the hunt execution terminal device included in the start of the shared mode is different from the second terminal device 100b and the third terminal device 100c. Corresponds to executing the connection to the base station apparatus 200.

FIG. 18 is a sequence diagram showing a fourth processing procedure in the communication system 1000. This corresponds to a process of canceling the background hunt sharing mode of the terminal device 100 by moving one terminal device 100 included in the group out of the proximity area 350. The third terminal device 100c moves from the point pX to the point pZ (S300). Point pZ is a general term for other positions that are not included in the proximity area 350. The communication unit 170 of the third terminal device 100c transmits a terminal information periodic report including the point pZ as position information to the management device 400 (S302).

The receiving unit 412 of the management device 400 receives the terminal information periodic report from the third terminal device 100c. Since the position information of the third terminal device 100c is not included in the proximity area 350, the control unit 420 determines to stop the background hunt sharing with respect to the third terminal device 100c, and updates the sharing list of the storage unit 430 (S304). ). This corresponds to stopping the background hunt sharing with respect to the third terminal device 100c because it is detected that the distance between the third terminal device 100c and the hunt execution terminal device in the group is longer than a predetermined distance. .. To stop background hunt sharing is to perform background hunt processing. FIG. 19 shows the data structure of the shared list stored in the storage unit 430. The position information of the third terminal device 100c is updated to the point pZ, and the third terminal device 100c is excluded from the group. Return to FIG. The control unit 420 generates information for instructing the third terminal device 100c to stop the background hunt sharing (hereinafter, referred to as “shared mode stop”), and the notification unit 414 stops the sharing mode for the third time. It is transmitted to the terminal device 100c (S306).

The communication unit 170 of the third terminal device 100c receives the shared mode stop, and the control unit 120 ends the background hunt sharing mode (S308). The control unit 120 of the third terminal device 100c starts a background hunt (S310).

FIG. 20 is a sequence diagram showing a fifth processing procedure in the communication system 1000. This corresponds to the process when exiting the background sharing mode. The second terminal device 100b moves from the point pX to the point pQ (S400). Point pQ is a general term for other positions that are not included in the proximity area 350. The communication unit 170 of the second terminal device 100b transmits a terminal information periodic report including the point pQ as the position information to the management device 400 (S402).

The receiving unit 412 of the management device 400 receives the terminal information periodic report from the second terminal device 100b. Since the position information of the second terminal device 100b is not included in the proximity area 350, the control unit 420 decides to stop the background hunt sharing with respect to the second terminal device 100b. Further, the control unit 420 also determines to stop the background hunt sharing with respect to the first terminal device 100a because the group includes only the first terminal device 100a due to the stop of the background hunt sharing with respect to the second terminal device 100b. The control unit 420 updates the shared list of the storage unit 430 accordingly (S404). The control unit 420 generates a shared mode stop in the first terminal device 100a and the second terminal device 100b, and the notification unit 414 transmits the shared mode stop to the first terminal device 100a and the second terminal device 100b (S406, S408).

The communication unit 170 of the first terminal device 100a and the communication unit 170 of the second terminal device 100b receive the shared mode stop, and the control unit 120 ends the background hunt sharing mode (S410, S412). The control unit 120 of the second terminal device 100b starts a background hunt (S414).

According to this embodiment, since the group is specified in the management device and the hunt execution terminal device is selected based on the position information, the processing in the terminal device can be simplified. Further, since the management device manages the background hunt processing, even if the number of terminal devices included in the group increases, it is possible to suppress an increase in the amount of short-range wireless communication in the hunt execution terminal device. Further, since the increase in the amount of short-range wireless communication in the hunt execution terminal device is suppressed, the increase in the power consumption in the hunt execution terminal device can be suppressed. Further, since the management device manages the background hunt processing, the background hunt can be shared even by the terminal device having no short-range wireless communication function. Moreover, since the background hunt is shared, it is possible to suppress an increase in power consumption of the terminal device. Further, since the management device manages the background hunt processing, the background hunt processing can be efficiently executed.

Also, since the terminal device with the highest remaining battery power is selected as the hunt execution terminal device, the operating time of the hunt execution terminal device can be lengthened. Further, since the terminal device having the longest sustainable time is selected as the hunt execution terminal device, the operating time of the hunt execution terminal device can be lengthened. Further, when it is detected that the distance between the one terminal device and the hunt execution terminal device is longer than a predetermined distance, the background hunt process is executed by the one terminal device, so that the accuracy of the background hunt process can be improved.

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

100 terminal device, 110 1st communication unit, 120 control unit, 130 2nd communication unit, 140 battery, 160 storage unit, 170 communication unit, 180 positioning unit, 200 base station equipment, 300 communication area, 350 proximity area, 400 management Device, 410 communication unit, 412 receiver unit, 414 notification unit, 420 control unit, 422 specific unit, 424 selection unit, 430 storage unit, 1000 communication system.

Claims

A first communication unit that registers a specific base station device and communicates with the registered base station device using the first wireless communication method.
A second communication unit that communicates with other terminal devices using a second wireless communication method that is different from the first wireless communication method.
A control unit that controls the first communication unit and the second communication unit,
A storage unit that stores a list containing information about multiple base station devices,
With
The control unit controls the first communication unit so as to execute a background hunt process for searching for another base station device having a better radio wave environment than the registered base station device among the plurality of base station devices. And
When it is determined that the information received from the other terminal device satisfies a predetermined condition, the background hunt process is stopped and the determination result is transmitted to the other terminal device to the second communication unit. A terminal device characterized in that it is controlled to transmit.
It also has a battery to drive the terminal device.
The second communication unit receives information on the remaining battery level of the other terminal device, and receives information about the remaining battery level.
The terminal device according to claim 1, wherein the predetermined condition is a case where the remaining amount of the battery of the terminal device is smaller than the remaining amount of the battery of the other terminal device.
It also has an acquisition unit that acquires the position information of the terminal device.
The second communication unit receives the position information of the other terminal device and receives the position information.
The terminal device according to claim 2, wherein the predetermined condition is further such that the position of the other terminal device is a distance equal to or less than a predetermined threshold value from the position of the terminal device.
When information about another base station device having a better radio wave environment than the base station device registered in the second communication unit is received during the period when the background hunt processing is stopped in the first communication unit. The terminal device according to any one of claims 1 to 3, wherein the control unit causes the first communication unit to register the other base station device.
A step of registering a specific base station device and communicating with the registered base station device using the first wireless communication method.
A step of communicating with another terminal device using a second wireless communication method different from the first wireless communication method,
A step of controlling a step of communicating with the base station device and a step of communicating with the other terminal device,
A step to store a list containing information about multiple base station devices, and
For the step of communicating with the base station device, a background hunt process for searching for another base station device having a better radio wave environment than the registered base station device is executed from the plurality of base station devices. Steps and
When it is determined that the information received from the other terminal device satisfies a predetermined condition, the background hunt process executed by the step of communicating with the base station device is stopped, and the determination result is used as the other terminal. Steps to send to the device and
A communication method characterized by comprising.
A management device that manages a plurality of terminal devices and a plurality of base station devices.
A receiving unit that receives information about the base station device, position information, and battery level information from each of the plurality of terminal devices.
A storage unit that stores a shared list in which information about the base station device, location information, and battery level information are associated with each terminal device.
A control unit that identifies two or more terminal devices from the plurality of terminal devices and selects a hunt execution terminal device that executes background hunt processing on behalf of the specified two or more terminal devices.
A notification unit that transmits a shared mode notification including information about a base station device to be connected to the specified two or more terminal devices and information about the selected hunt execution terminal device to the specified two or more terminal devices. ,
With
When the receiving unit receives information about a second base station device different from the first base station device associated with the two or more terminal devices specified in the shared list, the control unit said. A management device for controlling a notification unit to transmit a shared mode notification including information about the second base station device to the two or more specified terminal devices.
Based on the position information included in the shared list, the control unit sets the specific unit that identifies two or more terminal devices within a predetermined distance from the plurality of terminal devices and the shared list. The claim is characterized in that it has a selection unit that selects a hunt execution terminal device that executes background hunt processing on behalf of the two or more specified terminal devices based on the included battery remaining amount information. The management device according to 6.
The management device according to claim 7, wherein the selection unit selects the terminal device having the largest remaining battery level indicated by the battery remaining amount information as the hunt execution terminal device.
When the control unit detects that the distance between one of the two or more specified terminal devices and the hunt execution terminal device is longer than a predetermined distance, the control unit performs a background hunt to the one terminal device. The management device according to any one of claims 6 to 8, wherein a notification for processing is transmitted to the notification unit.