JP6907902B2 - Mobile terminal device, wireless system, MR response method and MR response program - Google Patents

Description

The present invention relates to mobile terminal devices, wireless systems, MR response methods and MR response programs.

For example, an application server arranged on a core network connects to a mobile terminal and provides a communication service such as a video viewing application to the mobile terminal. However, when the transmission distance of the mobile terminal to the application server becomes long, data delay in the communication service occurs. Therefore, in recent years, in addition to the application server, an edge server that provides a communication service is arranged in, for example, a base station that accommodates and connects a mobile terminal, and the transmission distance to the mobile terminal is shortened to reduce data delay. Suppressing edge computing is known.

For example, if a mobile terminal enters a dead zone of radio waves in response to movement while using a communication service, communication with a base station becomes impossible. Then, after leaving the dead zone and returning to the service area in response to further movement, the mobile terminal can start a connection with a base station equipped with an edge server that provides the communication service and continue to use the communication service.

International Publication No. 2017/043204

However, the base station includes an on-board base station equipped with an edge server and an unmounted base station not equipped with an edge server. Therefore, when the mobile terminal returns from the dead zone while using the communication service, it takes time to search for the installed base station from among a plurality of base stations, and it takes time to restart the communication service. You cannot continue to use the communication service.

In addition, the mobile terminal activates a handover function for switching to a switching destination base station having a good reception level when the reception level with the connection source base station drops according to the movement while the communication service is being used. However, even if the mobile terminal executes the handover, it takes time to search for the installed base station from among the multiple switching destination base stations, and it takes time to restart the communication service. Cannot continue to use.

One aspect is to provide a mobile terminal device or the like that can continue to use the communication service.

In one aspect, the mobile terminal device wirelessly connects to a base station equipped with a server that provides a communication service among a plurality of base stations, and acquires the communication service from the server. The mobile terminal device has a storage unit, a determination unit, and a response unit. The storage unit stores identification information that identifies the base station on which the server is mounted. When the determination unit receives an MR (Measurement Report) request from the base station, the determination unit determines whether or not the identification information of the base station from which the MR is requested is stored in the storage unit. When the identification information of the base station of the MR request source is in the storage unit, the response unit transmits an MR response in response to the MR request, and the identification information of the base station of the MR request source is in the storage unit. If not, the transmission of the MR response in response to the MR request is suspended.

As one aspect, you can continue to use the communication service.

FIG. 1 is an explanatory diagram showing an example of the communication system of this embodiment. FIG. 2 is an explanatory diagram showing an example of the hardware configuration of the management server. FIG. 3 is an explanatory diagram showing an example of the functional configuration in the management server. FIG. 4 is an explanatory diagram showing an example of a map table. FIG. 5 is an explanatory diagram showing an example of a map table after mounting an edge server on a base station without mounting “1”. FIG. 6 is an explanatory diagram showing an example of the list. FIG. 7 is an explanatory diagram showing an example of the hardware configuration of the base station. FIG. 8 is an explanatory diagram showing an example of the functional configuration in the base station. FIG. 9 is an explanatory diagram showing an example of the hardware configuration of the edge server. FIG. 10 is an explanatory diagram showing an example of the functional configuration in the edge server. FIG. 11 is an explanatory diagram showing an example of the hardware configuration of the mobile terminal. FIG. 12 is an explanatory diagram showing an example of a functional configuration in the mobile terminal. FIG. 13 is an explanatory diagram showing an example of the operation of the entire communication system. FIG. 14 is a flow chart showing an example of the processing operation of the first CPU in the management server involved in the distribution processing. FIG. 15 is a flow chart showing an example of the processing operation of the fourth CPU in the mobile terminal involved in the update processing. FIG. 16A is a flow chart showing an example of the processing operation of the fourth CPU in the mobile terminal involved in MR response processing. FIG. 16B is a flow chart showing an example of the processing operation of the fourth CPU in the mobile terminal involved in MR response processing. FIG. 17 is an explanatory diagram showing an example of an information processing device that executes an MR response program.

Hereinafter, examples of the mobile terminal device and the like disclosed in the present application will be described in detail with reference to the drawings. The disclosed technology is not limited by the present embodiment. In addition, the examples shown below may be appropriately combined as long as they do not cause a contradiction.

FIG. 1 is an explanatory diagram showing an example of the communication system 1 of the present embodiment. The communication system 1 shown in FIG. 1 has a management server 2, a plurality of base stations 3, and a plurality of mobile terminals 4. The management server 2 and the base station 3 are connected by, for example, a communication network such as the core network 5. The base station 3 and the mobile terminal 4 are wirelessly connected by, for example, a wireless communication network such as an LTE (Long Term Evolution) network 6.

The management server 2 is, for example, a MEC (Mobile Edge Computing) server located in a centralized management center that manages all base stations 3. Further, a plurality of application servers 7 are connected to the core network 5. The application server 7 connects to the mobile terminal 4 via the core network 5 and provides the mobile terminal 4 with a communication service such as a video viewing application. The base station 3 includes a mounted base station 3A equipped with an edge server 8 that provides a communication service to the mobile terminal 4, and a non-mounted base station 3B not equipped with the edge server 8. The edge server 8 is an edge computing type server that provides a communication service to the mobile terminal 4. The mounted base station 3A includes not only the case where the edge server 8 is mounted inside the base station 3A but also the case where the base station 3A is externally connected to the edge server 8 at a short distance. The on-board base station 3A provides a communication service from the edge server 8 mounted on the own station to the mobile terminal 4 accommodated and wirelessly connected by the own station.

FIG. 2 is an explanatory diagram showing an example of the hardware configuration of the management server 2. The management server 2 is a server that manages all the base stations 3 in the communication system 1. The management server 2 shown in FIG. 2 includes a NWIF (Network Interface) 11, an input / output IF (Interface) 12, an HDD (Hard Disk Drive) 13, a memory 14, and a first CPU (Central Processing Unit) 15. Have. The NWIF 11 is a communication IF that controls communication with the core network 5. The input / output IF 12 is, for example, an IF of a display unit, an operation unit, or the like. The HDD 13 is a storage device that stores various types of information. The memory 14 is, for example, a storage area such as a RAM (Random Access Memory) including a work area for developing a program function executed by the first CPU 15. The first CPU 15 controls the entire management server 2.

FIG. 3 is an explanatory diagram showing an example of the functional configuration in the management server 2. In addition to NWIF11, the management server 2 shown in FIG. 3 includes a map table 21, a list DB 22, an input processing unit 23, an output processing unit 24, a search unit 25, an update unit 26, and a confirmation unit 27. , A distribution unit 28, and a first control unit 29. The first CPU 15 expands the read program on the memory 14, so that the input processing unit 23, the output processing unit 24, the search unit 25, the update unit 26, the confirmation unit 27, the distribution unit 28, and the first CPU 15 can be used. The control unit 29 is executed as a function. It is assumed that the map table 21 and the list DB 22 are stored in the HDD 13, for example. The map table 21 is a table in which each base station 3 managed by the management server 2 is mapped so that the adjacency status can be understood, and map information for managing the neighboring base stations 3 adjacent to each base station 3 is stored. .. In the map information, the base station 3 is identified by the base station ID. The base station ID is identification information that identifies the base station 3. The list DB 22 is a database that manages the base station IDs of the on-board base stations 3A in association with the base station IDs of the on-board base stations 3A adjacent to the on-board base station 3A for each base station ID.

The input processing unit 23 is a processing unit that processes input data from the NWIF 11. The output processing unit 24 is a processing unit that processes output data to the NWIF 11. The search unit 25 is a processing unit that searches for base station IDs around the target base station from the map table 21 and the list DB 22. The update unit 26 is a processing unit that updates and controls the contents of the map table 21 and the list DB 22. The confirmation unit 27 is a processing unit that confirms the updated contents of the list in the list DB 22. The distribution unit 28 is a processing unit that distributes the update contents to the subordinate base station 3 when an update in the list DB 22 is detected. The first control unit 29 is a processing unit that controls the entire management server 2.

FIG. 4 is an explanatory diagram showing an example of the map table 21. The numbers in the frame of the map table 21 shown in FIG. 4 indicate the base station ID that identifies the base station 3, and the numbers in the white frame in the figure indicate the base station ID of the non-mounted base station 3B. The numbers in the shaded frame of are indicating the base station ID of the on-board base station 3A. When the first CPU 15 refers to the map table 21 and pays attention to, for example, the base station 3B without mounting of “1”, “2” is set as the peripheral base station 3 adjacent to the base station 3B without mounting of “1”. -The base station 3B without "9" mounted can be identified. For example, when focusing on the base station 3A with "11" installed in the first CPU 15, the peripheral base stations 3 are not equipped with "2", "3", "9", "27" and "12". The base station 3B can be distinguished from the base station 3A equipped with "10", "28" and "29".

The first CPU 15 updates the list DB 22 based on the table contents of the map table 21. FIG. 5 is an explanatory diagram showing an example of a map table 21 after the edge server 8 is mounted on the base station 3B without mounting “1”. When the first CPU 15 detects the notification of the new installation of the edge server 8 from the base station 3 of "1", the base station 3B without "1" shown in the white frame of FIG. 4 is shaded in the shaded frame of FIG. Change to the on-board base station 3A shown by. Then, the first CPU 15 updates the list DB 22 in order to add the base station 3A equipped with “1” based on the table contents of the map table 21 shown in FIG.

FIG. 6 is an explanatory diagram showing an example of the list. The list shown in FIG. 6 is managed by associating each base station ID that identifies the mounted base station 3A with the base station ID that identifies the peripheral mounted base station 3A adjacent to the mounted base station 3A. It is a thing. It is assumed that the list is stored in the list DB 22. The first CPU 15 refers to the list shown in FIG. 6, and when focusing on, for example, the “10” mounted base station 3A, the peripheral mounted base stations corresponding to the “10” mounted base station 3A As, "11" and "28" are mounted to identify the base station 3A. Further, for example, when the first CPU 15 detects the notification of the new installation of the base station 3A with the "1" mounted, the base station 3A with the "1" mounted and the base station 3A with the "1" mounted. Add "Null" to the list as the base station 3A with on-board equipment in the adjacent periphery.

FIG. 7 is an explanatory diagram showing an example of the hardware configuration of the base station 3. The base station 3 shown in FIG. 7 has a NWIF 31, a wireless IF 32, an input / output IF 33, an HDD 34, a memory 35, and a second CPU 36. The base station 3 is a device that wirelessly accommodates and connects the mobile terminal 4. The NWIF 31 is a communication IF that controls communication with the core network 5. The wireless IF 32 is a communication IF such as a wireless antenna and a wireless communication function that control communication with the LTE network 6.

FIG. 8 is an explanatory diagram showing an example of the functional configuration in the base station 3. The base station 3 shown in FIG. 8 has a basic function unit 40 in addition to the NWIF31 and the radio IF32. The second CPU 36 executes the basic function unit 40 as a function by expanding the read program on the memory 35. The basic function unit 40 has a basic function as a base station 3, and executes the MR request unit 41, the MR reception unit 42, the handover function unit 43, and the second control unit 44 as functions. The MR request unit 41 is a processing unit that transmits an MR request requesting MR (Measurement Report), which is a measurement result of the received electric field strength with the own station, to the mobile terminal 4 around the own station. The MR request is a message requesting the mobile terminal 4 to perform MR with its own station. The MR request includes the base station ID of the base station 3 that is the source of the MR request. The mobile terminal 4 measures the received electric field strength with and from the base station 3 of the MR request source in response to the MR request, and transmits the MR as the measurement result to the base station 3 of the MR request source as an MR response. The MR response is a message notifying the MR from the mobile terminal 4. The MR receiving unit 42 is a processing unit that receives an MR response to an MR request from the mobile terminal 4 and controls communication with the mobile terminal 4 based on the MR response.

The handover function unit 43 causes the mobile terminal 4 accommodated by the own station to transmit the peripheral MR request to the MR request unit 41, and causes the MR receiving unit 42 to receive the MR response to the peripheral MR request, and the received MR response is used. Based on this, it is a processing unit that controls communication with the mobile terminal 4. The peripheral MR request is a message such as RRC Connection Reconfiguration, which requests the mobile terminal 4 to perform MR with the peripheral base station 3. The peripheral MR response is a message for notifying the MR requesting base station 3 of the MR with the peripheral base station 3. The mobile terminal 4 measures the received electric field strength of the base station 3 around its own station in response to the peripheral MR request, and generates the MR of the peripheral base station 3 which is the measurement result. The second control unit 44 is a processing unit that controls the entire own station.

FIG. 9 is an explanatory diagram showing an example of the hardware configuration of the edge server 8. The edge server 8 shown in FIG. 9 has a NWIF 51, an input / output IF 52, an HDD 53, a memory 54, and a third CPU 55. The NWIF 51 is a communication IF that controls communication with the core network 5. The edge server 8 is, for example, a server that is mounted in the mounted base station 3A and provides a communication service to the mobile terminal 4 through the mounted base station 3A.

FIG. 10 is an explanatory diagram showing an example of the functional configuration in the edge server 8. In addition to the NWIF 51, the edge server 8 shown in FIG. 10 includes a list memory 61, an input processing unit 62, an output processing unit 63, a distribution response unit 64, a memory update unit 65, a request reception unit 66, and the like. It has an acquisition unit 67, a response unit 68, a notification unit 69, and a third control unit 70. The third CPU 55 expands the read program on the memory 54, so that the input processing unit 62, the output processing unit 63, the distribution response unit 64, the memory update unit 65, the request reception unit 66, the acquisition unit 67, The response unit 68, the notification unit 69, and the third control unit 70 are executed as functions.

The input processing unit 62 is a processing unit for inputting data from the NWIF 51. The output processing unit 63 is a processing unit that outputs data to the NWIF 51. The distribution response unit 64 is a processing unit that receives the list information distributed from the management server 2 via the NWIF 51. The list information is a list managed by the management server 2. The update unit 65 is a processing unit that updates the list in the list memory 61 with the list information received by the distribution response unit 64.

The request receiving unit 66 is a processing unit that receives a list request from the mobile terminal 4 via the NWIF 51. The list request is a message requesting a list from the mobile terminal 4. The acquisition unit 67 is a processing unit that acquires the list from the list memory 61 when the list request is received. The response unit 68 is a processing unit that notifies the mobile terminal 4 of the list request of the list acquired by the acquisition unit 67. The notification unit 69 is a processing unit that transmits a notification of the new installation of the edge server 8 to the management server 2 via the NWIF 51. The new installation is a new installation when a new edge server 8 is mounted on the base station 3B without mounting, or a new installation when the base station 3A with new mounting is newly installed in the communication system 1.

FIG. 11 is an explanatory diagram showing an example of the hardware configuration of the mobile terminal 4. The mobile terminal 4 shown in FIG. 11 has a wireless IF 71, an input / output IF 72, a memory 73, and a fourth CPU 74. The mobile terminal 4 is a terminal device that is wirelessly accommodated and connected to the base station 3. For example, in the case of the base station 3A, the mobile terminal 4 acquires the communication service from the edge server 8 through the base station 3A, and in the case of the base station 3B, for example, the communication service from the application server 7 through the core network 5 and the base station 3B. To get. The wireless IF 71 is a communication IF such as a wireless antenna and a wireless communication function that control communication with the LTE network 6.

FIG. 12 is an explanatory diagram showing an example of the functional configuration in the mobile terminal 4. In addition to the wireless IF 71, the mobile terminal 4 shown in FIG. 12 has a storage unit 81, an input processing unit 82, an output processing unit 83, a list request unit 84, and a list response unit 85. Further, the mobile terminal 4 has an MR request receiving unit 86, an extraction unit 87, a determination unit 88, an MR response unit 89, a standby timer unit 90, and a fourth control unit 91. The fourth CPU 74 expands the read program on the memory 73. Then, the fourth CPU 74 includes an input processing unit 82, an output processing unit 83, a list request unit 84, a list response unit 85, an MR request reception unit 86, an extraction unit 87, a determination unit 88, an MR response unit 89, and a standby unit. The timer unit 90 and the fourth control unit 91 are executed as functions. It is assumed that the storage unit 81 is stored in the memory 73.

The input processing unit 82 is a processing unit that inputs data from the wireless IF 71. The output processing unit 83 is a processing unit that outputs data to the wireless IF 71. The list request unit 84 is a processing unit that is mounted via the wireless IF 71 and requests a list from the edge server 8 in the base station 3A. The list response unit 85 is a processing unit that receives a list in response to a list request from the edge server 8 mounted in the base station 3A via the wireless IF 71, and updates the received list to the storage unit 81.

For example, when the MR request receiving unit 86 leaves the dead zone, the MR request receiving unit 86 receives the MR request from the peripheral base station 3 via the wireless IF 71, and receives the electric field between the MR request receiving unit 86 and the base station 3 of the MR request source in response to the MR request. It is a processing unit that measures the strength. It is assumed that the MR request stores the base station ID that identifies the base station 3 that issued the MR request. The extraction unit 87 is a processing unit that extracts the base station ID from the MR request received by the MR request reception unit 86. The determination unit 88 is a processing unit that determines whether or not the base station ID extracted by the extraction unit 87 is in the list stored in the storage unit 81. The MR response unit 89 is a processing unit that transmits an MR response to the base station 3 of the base station ID via the wireless IF 71 when the base station ID is listed.

The standby timer unit 90 is a processing unit that starts the measurement operation of the standby timer when the MR request receiving unit 86 receives an MR request. The timer time of the standby timer unit 90 is, for example, 10 msec, but can be changed as appropriate. When the base station ID of the MR requesting base station 3 is not in the list, the MR response unit 89 waits for the transmission of the MR response until the standby timer unit 90 times out. Then, when the standby timer unit 90 has timed up, the MR response unit 89 transmits an MR response to the base station 3 that is the MR request source.

That is, for example, when the MR response unit 89 leaves the dead zone, the MR request source base station 3 is in the list, that is, the MR request source base station 3 is mounted and the base station 3A is the case. An MR response is transmitted to the base station 3 that is the source of the MR request. When the base station 3 of the MR request source is not in the list and the standby timer times out, the MR response unit 89 transmits an MR response to all the base stations 3B of the MR request source without mounting.

When the on-board base station 3A receives the MR response from the mobile terminal 4, it requests a connection with the mobile terminal 4. Then, the mobile terminal 4 starts communication with the on-board base station 3A in response to the connection request from the on-board base station 3A. As a result, the mobile terminal 4 enjoys the communication service from the edge server 8 in the base station 3A with the start of communication. On the other hand, when the non-mounted base station 3B receives the MR response from the mobile terminal 4, it requests a connection with the mobile terminal 4 based on the MR response. Then, the mobile terminal 4 starts communication with the non-mounted base station 3B in response to the connection request from the non-mounted base station 3B. As a result, the mobile terminal 4 enjoys the communication service from the application server 7 connected to the core network 5 through the non-mounted base station 3B.

Further, for example, when the MR request receiving unit 86 activates the handover, the MR request receiving unit 86 receives the peripheral MR request from the connection source base station 3 via the wireless IF 71, and receives the peripheral MR request from the peripheral base station 3 in response to the peripheral MR request. Measure the received electric field strength of. It is assumed that the peripheral MR request stores the base station ID that identifies the base station 3 around the connection source base station 3. The extraction unit 87 extracts the base station ID from the peripheral MR request received by the MR request reception unit 86. The determination unit 88 determines whether or not the extracted base station ID is in the list stored in the storage unit 81. When the base station ID is listed, the MR response unit 89 transmits a peripheral MR response of only the base station ID to the connection source base station 3 via the wireless IF71.

When the MR request receiving unit 86 receives a peripheral MR request, the standby timer unit 90 starts the measurement operation of the standby timer. When the base station ID of the peripheral base station 3 is not in the list, the MR response unit 89 waits for the transmission of the peripheral MR response until the standby timer unit 90 times out. Then, when the standby timer unit 90 has timed up, the MR response unit 89 transmits a peripheral MR response to the connection source base station 3.

That is, the MR response unit 89 is involved in the mounted base station 3A, for example, when the handover is activated, when the peripheral base station 3 is in the list, that is, when the peripheral base station 3 is mounted and the base station 3A is mounted. The peripheral MR response is transmitted to the connection source base station 3. When the peripheral base station 3 is not in the list and the standby timer times out, the MR response unit 89 transmits a peripheral MR response related to the peripheral non-mounted base station 3B to the connection source base station 3.

When the connection source base station 3 receives a peripheral MR response related to the on-board base station 3A from the mobile terminal 4, it instructs the on-board base station 3A to request a connection to the mobile terminal 4. The on-board base station 3A of the switching destination requests a connection with the mobile terminal 4 of the peripheral MR response. Then, the mobile terminal 4 starts communication with the switching destination mounted base station 3A in response to the connection request from the switching destination mounted base station 3A. As a result, the mobile terminal 4 enjoys the communication service from the edge server 8 in the base station 3A with the switching destination for starting the communication. On the other hand, when the connection source base station 3 receives the peripheral MR response related to the non-mounted base station 3B from the mobile terminal 4, the connection source base station 3 sends the mobile terminal 4 to the non-mounted base station 3B having a good reception level. Instruct a connection request. The on-board base station 3A of the switching destination requests a connection with the mobile terminal 4 of the peripheral MR response. Then, the mobile terminal 4 starts communication with the switching destination non-equipped base station 3B in response to the connection request from the switching destination non-equipped base station 3B. As a result, the mobile terminal 4 enjoys the communication service from the application server 7 connected to the core network 5 through the non-mounted base station 3B.

Next, the operation of the communication system 1 of this embodiment will be described. FIG. 13 is an explanatory diagram showing an example of the operation of the entire communication system 1. When the management server 2 detects the notification of new installation, it updates the list and distributes the list to the edge server 8 in the base station 3A with each mounted (step S101). The edge server 8 in each mounted base station 3A distributes the list to the mobile terminal 4 accommodated in the base station 3A. As a result, the mobile terminal 4 stores the list.

When the mobile terminal 4 enters the dead zone from the communication area of the base station 3A with "30" mounted, for example, the mobile terminal 4 disconnects from the base station 3A with "30" mounted (step S102). ). When the mobile terminal 4 leaves the dead zone in response to further movement, it receives an MR request from the surrounding base station 3A with "29" or base station 3B without "13" installed (). Step S103). The mobile terminal 4 determines whether or not the base station ID in the MR request is in the list. For example, the mobile terminal 4 does not transmit an MR response to the base station 3B without "13" because the base station ID of "13" in the MR request is not in the list (step S104). On the other hand, since the mobile terminal 4 has the base station ID of "29" in the MR request in the list, the mobile terminal 4 transmits an MR response to the base station 3A equipped with "29" (step S105). As a result, the base station 3A equipped with "29" starts communication with the mobile terminal 4 in response to the MR response from the mobile terminal 4, and the communication service is transferred from the edge server 8 mounted in the base station 3A to the mobile terminal. Provided to 4.

FIG. 14 is a flow chart showing an example of the processing operation of the first CPU 15A in the management server 2 involved in the distribution processing. The search unit 25 in the first CPU 15A in the management server 2 determines whether or not the notification of new installation has been received (step S11). The notification of new installation is, for example, when a new edge server 8 is mounted on the existing base station 3B without mounting, or a base station 3A with mounting equipped with the edge server 8 is newly added to the communication system 1. This is a message notified from the base station 3 to the management server 2 when the above is performed.

When the search unit 25 receives the notification of new installation (affirmation in step S11), the search unit 25 extracts the base station ID in the notification of new installation (step S12). The extracted base station ID is an ID that identifies the existing non-equipped base station 3B equipped with the new edge server 8 and the newly installed base station 3A equipped with the edge server 8.

The search unit 25 refers to the map table 21 and the list DB 22 and searches for the mounted base station 3A around the mounted base station 3A related to the new installation notification (step S13). For example, when the newly installed base station 3A with mounting is "11", the search unit 25 refers to the map table 21 and searches for "28", "29", and "10" as the surrounding base stations 3A with mounting. Get as a result. The update unit 26 in the first CPU 15 adds the base station ID that identifies the new installed base station 3A to the list corresponding to the peripheral installed base station 3A, which is the search result, in the map table 21. And the list DB22 is updated (step S14). When the newly installed base station 3A with mounting is "11", the update unit 26 corresponds to "11" of the base station 3A with mounting and the surrounding base stations 3A "28", "29" and "10". Add it to the list.

The distribution unit 28 in the first CPU 15 distributes the list to the newly installed base station 3A with installation, and also distributes the difference information of the list to the newly installed base station 3A with installation other than the base station 3A. (Step S15), the processing operation shown in FIG. 14 is terminated. The difference information is the difference between the list before the new installation notification and the list after the new installation notification. As a result, the edge server 8 in the on-board base station 3A updates the distributed difference information and the list to the list memory 61. When the search unit 25 does not receive the notification of new installation (denial in step S11), the search unit 25 ends the processing operation shown in FIG.

When the management server 2 that executes the distribution process shown in FIG. 14 detects the notification of the new installation of the newly installed base station 3A, the base station ID of the newly installed base station 3A and the newly installed base station 3A are installed. Installed base station around 3A Add the base station ID of 3A to the list. Then, in the case of a new arrangement of the installed base station 3A, the management server 2 distributes the list to the newly arranged installed base station 3A and the list to the base stations 3 other than the newly arranged installed base station 3A. Distribute the difference information of. As a result, the edge server 8 in each mounted base station 3A can secure a list reflecting the new installation.

When the management server 2 detects a notification of a new installation in which a new edge server 8 is installed in an existing non-installed base station 3B, the base station ID of the base station 3 in which the new edge server 8 is installed and the base concerned. Add the base station ID of the installed base station 3A around the station 3 to the list. Then, when the new edge server 8 is mounted on the existing base station 3, the management server 2 distributes the list to the base station 3 of the new edge server 8 and other than the base station 3 of the new edge server 8. The difference information of the list is distributed to the base station 3 of the above. As a result, the edge server 8 in each mounted base station 3A can secure a list reflecting the new installation.

FIG. 15 is a flow chart showing an example of the processing operation of the fourth CPU 74 in the mobile terminal 4 involved in the update processing. In FIG. 15, the fourth control unit 91 in the fourth CPU 74 in the mobile terminal 4 determines whether or not a connection start request has been detected from the connection source base station 3 (step S21). For example, when the list request unit 84 in the fourth CPU 74 detects a connection start request from the connection source base station 3 (affirmation in step S21), when the connection source base station 3 is mounted and the base station 3A is installed. Request a list from the edge server 8 in the base station 3A with the connection source installed (step S22). The list response unit 85 in the fourth CPU 74 determines whether or not the list or difference information has been received from the on-board base station 3A, which is the connection source base station 3 (step S23). When the list response unit 85 receives the list or difference information from the installed base station 3A, which is the connection source base station 3 (affirmation in step S23), the list response unit 85 uses the received list and difference information to list in the storage unit 81. The table is updated (step S24), and the processing operation shown in FIG. 15 ends.

When the list response unit 85 does not receive the list or the difference information from the installed base station 3A which is the connection source base station 3 (denial in step S23), the list response unit 85 determines whether or not the list and the difference information have been received. In order to monitor, the process proceeds to step S23. When the fourth control unit 91 does not detect the connection start request from the connection source base station 3 (denial in step S21), the fourth control unit 91 ends the processing operation shown in FIG.

The mobile terminal 4 that executes the update process shown in FIG. 15 receives a list or difference information from the edge server 8 of the connection source base station 3 in response to a list request for the on-board base station 3A that is the connection source base station 3. do. When the mobile terminal 4 receives the list and the difference information, the mobile terminal 4 updates the list stored in the storage unit 81 based on the received list and the difference information. As a result, the mobile terminal 4 can secure the latest list.

The mobile terminal 4 transmits a list request to the on-board base station 3A when it detects a connection start request from the on-board base station 3A of the connection source, but the present invention is not limited to this. For example, a list request may be mounted and transmitted to the base station 3A on a regular basis. Further, the mobile terminal 4 receives the list from the edge server 8 in the on-board base station 3A in response to the transmission of the list request to the on-board base station 3A, but the present invention is not limited to this. For example, the on-board base station 3A automatically provides a list or difference information to the mobile terminal 4 to be accommodated when a change occurs in the list even if the list request is not received from the mobile terminal 4. It may be delivered.

16A and 16B are flow charts showing an example of the processing operation of the fourth CPU 74 in the mobile terminal 4 involved in MR response processing. For convenience of explanation, the connection source base station 3 described in the process of FIG. 16 will be described as a mounted base station 3A. In FIG. 16A, the fourth control unit 91 in the fourth CPU 74 in the mobile terminal 4 determines whether or not it is communicating with the connection source base station 3 (step S41). The fourth control unit 91 determines whether or not the received electric field strength with the connection source base station 3 has dropped below a predetermined level when communicating with the connection source base station 3 (step S41 affirmative) (step S41 affirmative). Step S42).

When the received electric field strength with the connection source base station 3 is lower than the predetermined level (step S42 affirmative), the fourth control unit 91 is out of service with the current communication state with the connection source base station 3. It is determined whether or not there is (step S43). When the communication state is out of service area, the mobile terminal 4 is located in a dead zone, and communication between the mobile terminal 4 and the base station 3 is impossible. When the current communication state is out of service area (step S43 affirmative), the MR request receiving unit 86 in the fourth CPU 74 determines that the communication with the connection source base station 3 during communication has been disconnected. Then, the MR request receiving unit 86 determines whether or not the MR request has been received from the base stations 3 around the base station 3 of the connection source (step S44).

When the extraction unit 87 in the fourth CPU 74 receives the MR request from the surrounding base station 3 (affirmation in step S44), the extraction unit 87 acquires the base station ID and the received electric field strength for each base station 3 that is the MR request source (step S44 affirmative). Step S45). The base station ID to be acquired is an ID that identifies the base station 3 of the MR request source, and the received electric field strength to be acquired is the electric field strength between the base station 3 of the MR request source.

The standby timer unit 90 in the fourth CPU 74 starts the measurement operation of the standby timer after acquiring the base station ID and the received electric field strength for each base station 3 that is the MR request source (step S46). The standby timer is, for example, 10 msec. The determination unit 88 in the fourth CPU 74 refers to the storage unit 81 and determines whether or not the base station ID of the base station 3 that is the MR request source is in the list (step S47). When the base station ID of the base station 3 of the MR request source is in the list (step S47 affirmative), the MR response unit 89 in the fourth CPU 74 transmits an MR response to the base station 3 of the MR request source. (Step S48), the processing operation shown in FIG. 16A is terminated. Since the base station ID of the MR request source is in the list, the base station 3 is equipped with the base station 3A. As a result, the on-board base station 3A of the MR request source requests the connection with the mobile terminal 4 in response to the MR response from the mobile terminal 4 in step S48. Then, the base station 3A equipped with the MR request source resumes providing the communication service from the edge server 8 in the base station 3 of the MR request source to the mobile terminal 4.

When the base station ID of the base station 3 from which the MR is requested is not in the list (step S47 denied), the standby timer unit 90 determines whether or not the standby timer started in step S46 has timed up (step S49). .. When the standby timer time-ups (step S49 affirmative), the MR response unit 89 in the fourth CPU 74 transmits an MR response to the base station 3 of each MR request source (step S50), as shown in FIG. 16A. End the processing operation. The base station 3 that is the MR request source is a base station 3B that is not mounted because its base station ID is not in the list. As a result, the base station 3B without the mounting of the MR request source requests the connection with the mobile terminal 4 when the reception level is good, based on the MR response from the mobile terminal 4. Then, the base station 3B without the MR request source resumes providing the communication service from the application server 7 in the core network 5 to the mobile terminal 4.

When the standby timer has not timed up (step S49 is denied), the MR response unit 89 determines whether or not an MR request has been received from the base stations 3 around the connection source base station 3 (step S51). When the MR response unit 89 receives an MR request from the surrounding base station 3 (affirmation in step S51), the MR response unit 89 acquires the base station ID and the received electric field strength for each base station 3 that is the source of the MR request (step S52). Then, the MR response unit 89 proceeds to step S47 in order to determine whether or not the base station ID of the base station 3 that is the MR request source is in the list. That is, the fourth CPU 74 searches for the mounted base station 3A among the base stations 3 that are the MR request sources until the standby timer times out.

When the fourth CPU 74 does not receive the MR request from the peripheral base station 3 (denial in step S51), the fourth CPU 74 proceeds to step S49 in order to determine whether or not the standby timer has timed up. The fourth control unit 91 is not communicating with the connection source base station 3 (denial in step S41), or the received electric field strength of the connection source base station 3 is not lower than a predetermined level (step S42). Negative), the processing operation shown in FIG. 16A is terminated. When the MR request receiving unit 86 does not receive the MR request from the base station 3 around the base station 3 of the connection source (denial in step S44), the MR request receiving unit 86 determines in step S44 whether or not the MR request has been received. Move to.

The MR request receiving unit 86 determines that the current communication state is not out of service area (step S43 denied), that is, the handover activation, and determines whether or not a peripheral MR request has been received from the connection source base station 3 (step S61). ). The peripheral MR request is a message requesting the mobile terminal 4 to perform MR with the peripheral base station 3.

When the extraction unit 87 receives the peripheral MR request from the connection source base station 3 (affirmation in step S61), the extraction unit 87 acquires the base station ID and the received electric field strength for each of the peripheral base stations 3 (step S62). The standby timer unit 90 starts the measurement operation of the standby timer after acquiring the base station ID and the received electric field strength for each of the surrounding base stations 3 (step S63).

The determination unit 88 determines whether or not the base station ID of the peripheral base station 3 that has acquired the received electric field strength is in the list (step S64). When the base station ID of the peripheral base station 3 is in the list (step S64 affirmative), the MR response unit 89 transmits the MR response of the peripheral base station 3 to the connection source base station 3 (step S64 affirmative). Step S65), the processing operation shown in FIG. 16B is terminated. As a result, the connection source base station 3 sets the mounted base station 3A as the switching destination based on the MR response of the peripheral mounted base station 3A from the mobile terminal 4, and the mounted base station 3A of the switching destination is the switching destination. Is requested to connect to the mobile terminal 4. Then, the base station 3A equipped with the switching destination starts the connection with the mobile terminal 4, and the edge server 8 mounted in the base station 3A equipped with the switching destination resumes the provision of the communication service to the mobile terminal 4. Will be done.

When the base station IDs of the surrounding base stations 3 are not in the list (step S64 negated), the standby timer unit 90 determines whether or not the standby timer started in step S63 has timed up (step S66). When the standby timer has not timed up (step S66 is denied), the MR response unit 89 determines whether or not the peripheral MR request has been received again from the connection source base station 3 (step S67).

When the MR response unit 89 receives a peripheral MR request from the connection source base station 3 (affirmation in step S67), the MR response unit 89 acquires the base station ID and the received electric field strength for each base station 3 around the connection source base station 3A. (Step S69). Then, the determination unit 88 proceeds to step S64 in order to determine whether or not the base station IDs of the surrounding base stations 3 are in the list. When the standby timer unit 90 does not receive the peripheral MR request from the connection source base station 3 (denial in step S67), the standby timer unit 90 proceeds to step S66 in order to determine whether or not the standby timer has timed up.

When the standby timer time-ups (step S66 affirmative), the MR response unit 89 transmits a peripheral MR response of each peripheral base station 3B to the connection source base station 3 (step S68), and FIG. 16B. The processing operation shown in is terminated. As a result, the connection source base station 3 receives the peripheral MR response of each peripheral unmounted base station 3B from the mobile terminal 4, and based on the peripheral MR response, the reception level is selected from the peripheral unmounted base station 3B. Select a base station 3B without a good switching destination. Then, the connection source base station 3 requests the selected non-equipped base station 3B of the switching destination to connect to the mobile terminal 4. Then, the non-mounted base station 3B of the switching destination starts the connection with the mobile terminal 4 and ends the handover in response to the connection request. Then, the base station 3B without the switching destination will resume the provision of the communication service from the application server 7 of the core network 5 to the mobile terminal 4. When the MR request receiving unit 86 does not receive the peripheral MR request from the connection source base station 3 (denial in step S61), the MR request receiving unit 86 proceeds to step S61 in order to determine whether or not the peripheral MR request has been received.

When the mobile terminal 4 enters the dead zone and then leaves the dead zone during communication with the on-board base station 3A, an MR request is made from the base station 3 around the on-board base station 3A of the connection source. Is detected, and it is determined whether or not the base station ID of the base station 3 that is the MR request source is in the list. When the base station ID of the base station 3 of the MR request source is listed, the mobile terminal 4 determines that the base station 3 of the MR request source is equipped with the base station 3A, and determines that the base station 3 of the MR request source is equipped with the base station 3A. Send the MR response to 3A. As a result, when the on-board base station 3A of the MR request source receives the MR response, it starts the connection with the mobile terminal 4 and resumes the provision of the communication service from the edge server 8 to the mobile terminal 4. You can continue to use the communication service.

When the mobile terminal 4 enters the dead zone and then leaves the dead zone during communication with the on-board base station 3A, an MR request is made from the base station 3 around the on-board base station 3A of the connection source. Is detected, and it is determined whether or not the base station ID of the base station 3 that is the MR request source is in the list. If the base station ID of the base station 3 of the MR request source is not in the list until the standby timer expires, the mobile terminal 4 determines that the base station 3A is installed in the MR request source and does not have the base station 3A of each MR request source. An MR response is transmitted to the non-mounted base station 3B. As a result, when the MR request source non-equipped base station 3B does not receive the MR response, it starts the connection with the mobile terminal 4, and the application server 7 connected to the core network 5 connects to the mobile terminal 4. The provision of communication services can be resumed and the use of communication services can be continued.

When the mobile terminal 4 enters the dead zone and then leaves the dead zone during communication with the application server 7, an MR request is detected from the base station 3 around the base station 3A with the connection source installed. Then, it is determined whether or not the base station ID of the base station 3 of the MR request source is in the list. When the base station ID of the base station 3 of the MR request source is listed, the mobile terminal 4 determines that the base station 3 of the MR request source is equipped with the base station 3A, and determines that the base station 3 of the MR request source is equipped with the base station 3A. Send the MR response to 3A. As a result, when the on-board base station 3A of the MR request source receives the MR response, it starts the connection with the mobile terminal 4 and switches from the application server 7 to the edge server 8 of its own station. Then, the on-board base station 3A of the MR request source can resume the provision of the communication service from the edge server 8 to the mobile terminal 4 and continue to use the communication service.

When the mobile terminal 4 enters the dead zone and then leaves the dead zone during communication with the application server 7, an MR request is made from the base station 3 around the base station 3A with the connection source installed. It detects and determines whether or not the base station ID of the base station 3 that is the MR request source is in the list. If the base station ID of the base station 3 of the MR request source is not in the list until the standby timer expires, the mobile terminal 4 determines that the base station 3 of the MR request source is not mounted base station 3B and requests each MR. The MR response is transmitted to the original non-mounted base station 3B. As a result, when the MR request source non-equipped base station 3B does not receive the MR response, it starts the connection with the mobile terminal 4, and the application server 7 connected to the core network 5 connects to the mobile terminal 4. The provision of communication services can be resumed and the use of communication services can be continued.

In the mobile terminal 4, when the reception level is lowered and the handover function is activated in response to the movement during communication with the on-board base station 3A, the peripheral MR request is detected from the on-board base station 3A of the connection source. The mobile terminal 4 determines whether or not the base station ID of the switching destination base station 3 in the peripheral MR request is in the list. When the base station ID of the switching destination base station 3 is in the list, the mobile terminal 4 determines that the switching destination base station 3 is equipped with the base station 3A, and connects the peripheral MR response of the mounted base station 3A. It is transmitted to the original base station 3. When the connection source base station 3 receives the peripheral MR response, the connection source base station 3 requests the base station 3A with the switching destination of the peripheral MR response to connect the mobile terminal 4. Then, the base station 3A equipped with the switching destination can start the connection with the mobile terminal 4, resume the provision of the communication service from the edge server 8 of its own station to the mobile terminal 4, and continue to use the communication service. ..

In the mobile terminal 4, during communication with the on-board base station 3A, the reception level is lowered and the handover function is activated according to the movement, the peripheral MR request is detected from the on-board base station 3A of the connection source, and the peripheral is detected. It is determined whether or not the base station ID of the switching destination base station 3 in the MR request is in the list. If the base station ID of the switching destination base station 3 is not in the list until the standby timer expires, the mobile terminal 4 determines that the switching destination base station 3 is equipped and does not have the base station 3A, and the mobile terminal 4 determines that the base station 3A is not installed. The peripheral MR response of station 3B is transmitted to the connection source base station 3. When the connection source base station 3 receives the peripheral MR response, it selects the non-equipped base station 3B of the switching destination having a good reception level from the non-equipped base station 3B of the switching destination of the peripheral MR response, and switches the switching destination. Request the connection of the mobile terminal 4 to the above-mentioned non-mounted base station 3B. Then, the base station 3B without the switching destination starts the connection with the mobile terminal 4, restarts the provision of the communication service from the application server 7 connected to the core network 5 to the mobile terminal 4, and provides the communication service. You can continue to use it.

The mobile terminal 4 receives the communication service provided by the edge server 8. The edge server 8 is deployed at a base station 3 or the like, and there is a server deployed at a base station 3 as close as possible for the purpose of reducing the delay time during communication with the cloud and reducing the communication traffic to the cloud. If so, communicate with it.

The mobile terminal 4 that has left the dead zone connects to the base station 3 that has the strongest received radio wave strength in order to restart the communication service. When the base station 3 is a non-mounted base station 3B, the mobile terminal 4 inquires the management server 2 that manages all the base stations 3 for the base station ID of the adjacent peripheral mounted base station 3A, and the base is the base station 4. It is also conceivable to reconnect to the base station 3 with the station ID. However, when an inquiry occurs near a large number of dead zones such as a radio wave shield such as a building or a tunnel or a mountainous area where the base station 3 is few, a traffic load is generated on the transmission path to the management server 2 and the management server 2 It is possible that the query load will be concentrated. In this embodiment, in the mobile terminal 4 using the communication service, after leaving the dead zone, the on-board base station 3A is selected from the base stations 3 capable of communicating by using the list acquired in advance. And connect. As a result, it is not necessary to connect to the application server 7 connected to the core network 5 or to inquire the management server 2 for the base station ID.

The management server 2 refers to the map table 21 and identifies the neighboring base stations 3 adjacent to each base station 3 in units of base station IDs, but manages a plurality of base stations 3 in units of area IDs and manages the surroundings. The base station may be identified in units of area IDs, and can be changed as appropriate. In this case, when the search unit 25 searches for the newly installed installed base station 3A around the newly installed base station 3A, the search unit 25 uses the base station 3 having the same area ID as the newly installed installed base station 3A as the surrounding base station. It may be searched as 3, and can be changed as appropriate.

For convenience of explanation, the edge server 8 is connected to the vicinity of the base station 3, that is, inside or outside the base station 3, but it may be provided in the cloud and can be changed as appropriate.

In the above embodiment, the mobile terminal 4 such as a smartphone is illustrated, but for example, a mobile phone, a portable game terminal, a tablet terminal, or the like may be used.

Further, each component of each of the illustrated parts does not necessarily have to be physically configured as shown in the figure. That is, the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or part of them are functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.

Further, various processing functions performed by each device are performed on a CPU (Central Processing Unit) (or a microcomputer such as an MPU (Micro Processing Unit) or an MCU (Micro Controller Unit)) in whole or in any part thereof. You may try to do it. Further, various processing functions may be executed in whole or in any part on a program analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or on hardware by wired logic. Needless to say.

By the way, various processes described in this embodiment can be realized by executing a program prepared in advance in the information processing apparatus. Therefore, an example of an information processing device that executes a program having the same function as that of the above embodiment will be described below. FIG. 17 is an explanatory diagram showing an example of an information processing apparatus that executes a report response program.

The information processing device 100 that executes the MR response program shown in FIG. 17 has a wireless IF 110, a ROM 120, a RAM 130, and a CPU 140. The information processing apparatus 100 wirelessly connects to a plurality of base stations, and also wirelessly connects to a base station equipped with a server that provides a communication service among the plurality of base stations, and acquires a communication service from the server.

The ROM 120 stores in advance an MR response program that exhibits the same functions as those in the above embodiment. The report response program may be recorded on a recording medium that can be read by a drive (not shown) instead of the ROM 120. The recording medium may be, for example, a portable recording medium such as a CD-ROM, a DVD disc, a USB memory, or an SD card, or a semiconductor memory such as a flash memory. As the MR response program, as shown in FIG. 17, the determination program 120A and the response program 120B. The programs 120A and 120B may be integrated or dispersed as appropriate.

Then, the CPU 140 reads these programs 120A and 120B from the ROM 120, and executes each of the read programs. Then, as shown in FIG. 17, the CPU 140 functions each of the programs 120A and 140B as the determination process 140A and the response process 140B. The RAM 130 is an area for storing identification information that identifies a base station on which a server is mounted.

When the CPU 140 receives an MR (Measurement Report) request from the base station, the CPU 140 determines whether or not the identification information of the base station of the MR request source is in the RAM 130. The CPU 140 transmits an MR response in response to the MR request when the identification information of the base station from which the MR request is made is in the storage unit. Further, when the identification information of the base station of the MR request source is not in the storage unit, the CPU 140 suspends the transmission of the MR response in response to the MR request. As a result, the communication service can be continued.

3 Base station 3A Equipped base station 4 Mobile terminal 8 Edge server 81 Storage unit 88 Judgment unit 89 MR response unit

Claims (7)

A mobile terminal device that wirelessly connects to a base station equipped with a server that provides communication services among a plurality of base stations and acquires communication services from the server.
A storage unit that stores identification information that identifies the base station on which the server is mounted, and a storage unit that stores the identification information.
When an MR (Measurement Report) request is received from the base station, a determination unit for determining whether or not the identification information of the base station from which the MR is requested is stored in the storage unit, and a determination unit.
When the identification information of the base station of the MR request source is in the storage unit, the MR response in response to the MR request is transmitted, and when the identification information of the base station of the MR request source is not in the storage unit. , A mobile terminal device comprising a response unit that suspends transmission of an MR response in response to the MR request. The response unit
When the identification information of the base station of the MR request source is not in the storage unit, the transmission of the MR response is suspended until a predetermined time elapses after receiving the MR request, and after the predetermined time elapses, the MR response is held. The mobile terminal device according to claim 1, wherein the mobile terminal device. The determination unit
When the reception electric field strength with the connection source base station drops to a predetermined level and the communication state with the connection source base station is out of service, and an MR request is received from a base station in the vicinity of the mobile terminal device. In addition, it is determined whether or not the identification information of the base station of the MR request source is in the storage unit.
The response unit
According to claim 1 or 2, when the identification information of the base station of the MR request source is in the storage unit, the MR response in response to the MR request is transmitted to the base station of the MR request source. The mobile terminal device described. The response unit
The received electric field strength with the base station of the connection source drops to a predetermined level, the communication state with the base station of the connection source is maintained within the range, and the MR request related to the surrounding base stations is made from the base station of the connection source. When received, it is determined whether or not the identification information of the base station of the MR request source is in the storage unit.
The response unit
Any one of claims 1 to 3, wherein when the identification information of the peripheral base station is in the storage unit, the MR response in response to the MR request is transmitted to the base station of the connection source. The mobile terminal device described in 1. A wireless system having a plurality of base stations and a mobile terminal device that wirelessly connects to a base station equipped with a server that provides a communication service among the plurality of base stations and acquires a communication service from the server.
The mobile terminal device is
A storage unit that stores identification information that identifies the base station on which the server is mounted, and a storage unit that stores the identification information.
When an MR (Measurement Report) request is received from the base station, a determination unit for determining whether or not the identification information of the base station from which the MR is requested is stored in the storage unit, and a determination unit.
When the identification information of the base station of the MR request source is in the storage unit, the MR response in response to the MR request is transmitted, and when the identification information of the base station of the MR request source is not in the storage unit. , A wireless system comprising a response unit that suspends transmission of an MR response in response to the MR request. Among multiple base stations, a mobile terminal device that wirelessly connects to a base station equipped with a server that provides communication services and acquires communication services from the server
The identification information for identifying the base station on which the server is mounted is stored in the storage unit.
When an MR (Measurement Report) request is received from the base station, it is determined whether or not the identification information of the base station of the MR request source is in the storage unit.
When the identification information of the base station of the MR request source is in the storage unit, the MR response in response to the MR request is transmitted, and when the identification information of the base station of the MR request source is not in the storage unit. , An MR response method comprising executing a process of suspending transmission of an MR response in response to the MR request. An information processing device that wirelessly connects to a base station equipped with a server that provides communication services and acquires communication services from the server among multiple base stations.
The identification information for identifying the base station on which the server is mounted is stored in the storage unit.
When an MR (Measurement Report) request is received from the base station, it is determined whether or not the identification information of the base station of the MR request source is in the storage unit.
When the identification information of the base station of the MR request source is in the storage unit, the MR response in response to the MR request is transmitted, and when the identification information of the base station of the MR request source is not in the storage unit. , An MR response program characterized by executing a process of suspending transmission of an MR response in response to the MR request.

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