WO2018109916A1

WO2018109916A1 - Wireless communication system, wireless access management device, server management device, and edge server switching method

Info

Publication number: WO2018109916A1
Application number: PCT/JP2016/087453
Authority: WO
Inventors: 木村大; 妹尾浩明; 田島喜晴
Original assignee: 富士通株式会社
Priority date: 2016-12-15
Filing date: 2016-12-15
Publication date: 2018-06-21

Abstract

Provided are a wireless communication system, a wireless access management device, a server management device, and an edge server switching method which provide seamless service, even when a terminal device, which receives the service by using an edge server, performs handover. The wireless access management device transmits, to the server management device, a transition request of data accumulated in each edge server, when the terminal device performs the handover. The server management device responds to the transition request; executes a transition control for the accumulated data of the terminal device, which has been accumulated in a movement source edge server, on the basis of information about the movement source edge server corresponding to a movement source base station device and information about a movement destination edge server corresponding to a movement destination base station device; and transmits, to the wireless access management device, a transition completion notification which indicates the completion of the transition control. The wireless access management device responds to the transition completion notification and executes a handover control for handing over the terminal device.

Description

Wireless communication system, wireless connection management device, server management device, and edge server switching method

The present invention relates to a wireless communication system, a wireless connection management device, a server management device, and an edge server switching method.

In cloud services, data that a terminal device performs such as a server on the cloud (hereinafter referred to as a cloud server) stores data such as photos and videos, and sends software execution results to the terminal device. Provide storage and software execution as services. The cloud server is, for example, a large-scale data server and a processing server that executes software.

However, as the number of cloud service users increases, the processing load on the cloud server increases. Therefore, for example, an edge server that performs a part of calculation processing of software or temporarily stores large-scale data may be arranged near the terminal device. For example, since the edge server is arranged for each base station apparatus, an inexpensive server having a large number of arrangements and having a smaller processing amount and storage capacity than a cloud server is used. Then, a server management apparatus that manages how processing and data are distributed between the cloud server and the edge server is provided. The server management apparatus determines a distributed deployment of how much processing and data amount is distributed to which server based on the processing capability of the edge server such as the amount of data that can be processed by the edge server and the amount of data that can be stored. Further, when the terminal device is handed over, the server management device again determines the distributed deployment based on the processing capability of the edge server installed in the destination base station device.

The technology related to the edge server is described in Patent Document 1 below.

JP 2013-120973 A

However, the distributed deployment performed by the server management apparatus at the time of handover of the terminal apparatus may take time to complete due to calculation of the software processing amount in the server management apparatus, data transfer between servers, and the like.

For example, there is a case where a terminal device that is browsing a moving image with a cloud service is handed over. A part or all of the moving image data browsed by the terminal device is stored in the edge server of the base station device with which the terminal device is communicating. In this case, it takes time to transfer the stored video data to the edge server of the handover destination, and when the handover of the terminal device is completed before the video data transfer, the terminal device stores the video data until the video data transfer is completed. Cannot browse.

As described above, when a terminal device receiving a service using an edge server performs a handover, the service may be temporarily interrupted.

Therefore, a wireless communication system, a wireless connection management device, a server management device, and an edge server switching method are provided in which a service is not interrupted even when a terminal device receiving a service using an edge server performs a handover.

In one aspect, a plurality of base station devices that are wirelessly connected to a terminal device and relay communication of the terminal device, and a plurality of base station devices that are provided in association with each of the plurality of base station devices, A plurality of edge servers that store a part or all of them, a server management device that stores a correspondence relationship between the plurality of edge servers and the plurality of base station devices, and manages data stored in each of the edge servers, and the terminal A wireless connection management device that manages a handover in which a device moves over a base station device that is wirelessly connected, and the wireless connection management device requests transfer of data stored in each of the edge servers when the terminal device is handed over To the server management device, and the server management device responds to the migration request, and the source edge corresponding to the source base station device Based on the information about the destination edge server corresponding to the server and the destination base station device, the migration completion of the migration control of the terminal device stored in the source edge server is performed, and the migration completion is indicated. A notification is transmitted to the wireless connection management device, and the wireless connection management device executes handover control for handing over the terminal device in response to the transition completion notification.

According to one disclosure, the service is not interrupted even when the terminal device receiving the service using the edge server performs the handover.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10. FIG. 2 is a diagram illustrating a configuration example of the wireless connection management device 500. FIG. 3 is a diagram illustrating a configuration example of the base station apparatus 200. FIG. 4 is a diagram illustrating a configuration example of the server management apparatus 600. FIG. 5 is a diagram illustrating an example of a sequence of function redeployment processing at the time of handover in the wireless communication system 10. FIG. 6 is a diagram illustrating an example of a process flowchart of a handover request process in the base station apparatus 200. FIG. 7 is a diagram illustrating an example of a process flowchart of a function redeployment request process in the wireless connection management device 500. FIG. 8 is a diagram illustrating an example of a process flowchart of the function deployment process in the server management apparatus 600. FIG. 9 is a diagram illustrating a configuration example of the wireless communication system 10. FIG. 10 is a diagram illustrating a configuration example of the wireless connection management device 500. FIG. 11 is a diagram illustrating a configuration example of the terminal device 100. FIG. 12 is a diagram illustrating an example of a sequence of function redeployment processing at the time of handover in the wireless communication system 10. FIG. 13 is a diagram illustrating an example of a processing flowchart of the own device initiative function redeployment request processing in the wireless connection management device 500. FIG. 14 is a diagram illustrating an example of a handover sequence between the base station apparatuses 200 led by the terminal apparatus 100 and conforming to different standards. FIG. 15 is a diagram illustrating an example of a handover sequence when the wireless connection management device 500 and the server management device 600 in FIG. 14 are replaced with a central management device.

Hereinafter, the present embodiment will be described in detail with reference to the drawings. Problems and examples in the present specification are merely examples, and do not limit the scope of rights of the present application. In particular, even if the described expressions are different, as long as they are technically equivalent, the techniques of the present application can be applied even if the expressions are different, and the scope of rights is not limited.

[First embodiment]
A first embodiment will be described below.

<Configuration example of wireless communication system>
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10. The wireless communication system 10 includes a terminal device 100, base station devices 200-1 and 200-2 (hereinafter sometimes referred to as base station devices 200), and edge servers 300-1 and 2 (hereinafter referred to as edge servers 300). ) And a cloud computing system 400. In addition, the cloud computing system 400 (hereinafter may be referred to as the cloud 400) is a group of devices that provide the terminal device 100 with a cloud service. The cloud 400 includes a wireless connection management device 500, a server management device 600, and a cloud server 700. The wireless communication system 10 is a communication system that provides a cloud service to the terminal device 100. The terminal device 100 is a mobile communication device such as a smartphone or a tablet terminal, and moves within the wireless communication system 10. FIG. 1 shows an example in which the terminal device 100 moves. The terminal device 100-b shows the terminal device 100 before moving, and the terminal device 100-a shows the terminal device 100 after moving.

The terminal device 100 is wirelessly connected to the base station device 200 and receives a cloud service provided by the cloud server 700 via the wirelessly connected base station device 200. That is, the terminal device 100 communicates with the cloud server 700 (communication destination server) as a communication partner. The base station devices 200-1 and 200-2 are eNodeB (evolved （Node B) in the LTE (Long Term Evolution) communication standard, for example. Base station apparatuses 200-1 and 200-2 each have communication areas A200-1 and A200-2 (hereinafter sometimes referred to as communication area A200). Communication area A200 is a range in which base station apparatus 200 can wirelessly connect to terminal apparatus 100.

The base station devices 200-1 and 200-2 are associated with the edge servers 300-1 and 300-2, respectively.

The edge server 300 executes part or all of the processing instead of the cloud server 700. In this case, the edge server 300 accumulates, as data, application programs and objects for processing to be executed instead. The application program (or object) stored as data by the edge server 300 is, for example, a program (or object) optimized for each terminal device or each cloud service provided.

Further, the edge server 300 saves and transmits part or all of the data transmitted or stored by the cloud server instead of the cloud server 700. In this case, the edge server 300 accumulates data to be stored or transmitted instead.

That is, the data stored in the edge server 300 includes data related to alternative processing (application program and object) optimized for each terminal device 100. The data stored in the edge server 300 includes data stored and transmitted in place of the cloud server 700.

In FIG. 1, one edge server 300 is associated with one base station apparatus 200, but one edge server 300 or 1 with respect to a plurality of base station apparatuses 200. A plurality of edge servers 300 may be associated with one base station apparatus 200. Also, a plurality of edge servers 300 may be associated with a plurality of base station devices 200, or there may be a base station device 200 that is not associated with the edge server 300.

The cloud server 700 is a server that communicates with the terminal device 100 and provides the terminal device 100 with a cloud service. For example, the cloud server 700 transmits a result of executing predetermined software to the terminal device 100, or transmits data such as a moving image or an image to the terminal device. The cloud server 700 causes the edge server 300 to accumulate a part or all of data (including data to be stored and transmitted / received, application programs, and objects). The cloud server 700 may store all data without using the edge server 300.

The server management apparatus 600 is a server that manages the cloud server 700 and the edge servers 300-1 and 300-2. The server management apparatus 600 manages the free capacity that can be stored (stored) in the cloud server 700 and the edge servers 300-1 and 300, the executable processing amount, and the like. The server management apparatus 600 performs distributed deployment (also referred to as function deployment) based on the managed data. Distributed deployment is, for example, determining the processing executed by the edge server 300 as an alternative, the data amount of data stored in the edge server 300, and the like, and controlling the cloud server 700 and the edge server 300.

Further, when the edge server 300 that stores data used for communication of the terminal device 100 is changed due to the movement of the base station device 200 due to the handover of the terminal device 100, the server management device 600 performs the function distribution deployment again ( Hereinafter, it may be called function redeployment).

The wireless connection management device 500 manages the handover of the terminal device 100. The wireless connection management device 500 receives, for example, terminal information including information on a radio wave state of the terminal device 100 and information on a base station device to which the terminal device 100 can be wirelessly connected from the terminal device 100, and based on the received terminal information, the terminal It is determined whether or not the apparatus 100 is to be handed over. The radio wave state is, for example, the received power or the degree of interference of radio waves transmitted from the connected base station device 200 in the terminal device 100. For example, the base station device that is wirelessly connectable includes a detection signal for detecting a base station device that is transmitted (or broadcast) by a base station device other than the connected base station device. It is an identifier of a base station apparatus that can be received with reception quality.

Also, when the terminal device 100 is handed over, the wireless connection management device 500 stores the data stored in the server management device 500 and the edge server 300 in the edge server 300 of the base station device 200 that is the handover destination. Request to migrate.

In the wireless communication system 10, when the terminal apparatus 100 moves from the position of the terminal apparatus 100-b to the position of the terminal apparatus 100-a, the terminal apparatus 100 changes the base station apparatus 200 to be wirelessly connected to the base station apparatus 200- 1 to base station apparatus 200-2. At this time, for example, the server management device 500 transfers the stored data of the terminal device 100 stored in the edge server 300-1 to the edge server 300-2 corresponding to the destination base station device 200-2, and stores the stored data. Make a copy of In the first embodiment, the wireless connection management device 500 controls not to execute the handover of the terminal device 100 until copying of data between the edge servers is completed. As a result, the terminal device 100 can enjoy the cloud service without interruption even when the edge server 300 to be used is switched from the edge server 300-1 to the edge server 300-2.

<Configuration example of wireless connection management device>
FIG. 2 is a diagram illustrating a configuration example of the wireless connection management device 500. The wireless connection management device 500 includes a CPU (Central Processing Unit) 510, a storage 520, a memory 530 such as a DRAM (Dynamic Random Access Memory), and a NIC (Network Interface Card) 540. The wireless connection management device 500 is a computer, for example.

The storage 520 is an auxiliary storage device such as a flash memory, HDD (Hard Disk Drive), or SSD (Solid State Drive) that stores programs and data. The storage 520 stores a handover request reception program 521, a terminal information management program 522, and a terminal information table 523.

The terminal information table 523 is a table that stores terminal information received from the terminal device 100. When receiving the terminal information, the wireless connection management device 500 updates the terminal information table 523. The terminal information table 523 stores, for example, an identifier of the terminal device 100, an identifier of the base station device 200 that is wirelessly connected, a radio wave state in the terminal device 100, and the like.

The CPU 510 executes the handover request reception process by executing the handover request reception program 521. The handover request reception process is a process of receiving a handover request from the base station apparatus 200. In the handover request reception process, a function redeployment request process described later is performed.

The CPU 510 executes the function redeployment request module 5211 to construct a migration request transmission unit and a migration completion notification reception unit, and performs a function redeployment request process. The migration request transmission unit transmits a function redeployment request (migration request) to the server management apparatus 600 in the function redeployment request process. In addition, in the function redeployment request process, the transition completion notice receiving unit receives a function redeployment completion notice (migration completion notice) from the server management apparatus 600 and performs a handover process (handover control) for handing over the terminal device 100. The function redeployment request process is a process in which the wireless connection management device 500 transmits a function redeployment request to the server management device 600. The function redeployment request is a message that requests the server management device 600 to redeploy the data to be stored and the processing executed by each of the edge server 300 and the cloud server 700 when the edge server 300 of the terminal device 100 changes. is there.

Further, the CPU 510 executes a terminal information management program 522 to perform terminal information management processing. The terminal information management process is a process in which the wireless connection management device 500 manages terminal information received from the terminal device 100.

<Configuration example of base station device>
FIG. 3 is a diagram illustrating a configuration example of the base station apparatus 200. The base station apparatus 200 includes a CPU 210, a storage 220, a memory 230 such as a DRAM, a NIC 240, and an RF (Radio Frequency) circuit 250. The base station apparatus 200 is eNodeB in LTE, for example.

The storage 220 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 220 stores a wireless communication program 221 and a handover program 222.

The CPU 210 executes the wireless communication program 221 to construct a wireless communication unit and perform wireless communication processing. The wireless communication process relays communication performed by the terminal device 100, transmits a packet received from the terminal device 100 to a transmission destination, and transmits a packet addressed to the terminal device 100 to the terminal device 100.

Further, the CPU 210 executes the handover program 222 to construct a handover unit and perform a handover process. The handover process is a process of moving the base station apparatus 200 to which the terminal apparatus 100 is connected from the connected base station apparatus (movement source base station apparatus) to the movement destination base station apparatus (movement destination base station apparatus).

The CPU 210 executes the terminal-initiated handover module 2221 to perform terminal-initiated handover processing. The terminal initiated handover process is a process of receiving a handover request from the terminal apparatus 100 and transmitting the handover request to the wireless connection management apparatus 500.

The CPU 210 executes the base station initiative handover module 2222 to perform the base station initiative handover process. The base station initiated handover process is a process of determining whether or not to hand over to the terminal device 100 based on the terminal information received from the terminal device 100 and transmitting a handover request to the wireless connection management device 500 when performing handover.

The CPU 210 performs the handover request process by executing the handover request module 2223. The handover request process is a process of transmitting a handover request to the wireless connection management apparatus 500 and waiting for reception of a handover instruction transmitted in response to the handover request.

<Configuration example of server management device>
FIG. 4 is a diagram illustrating a configuration example of the server management apparatus 600. The server management apparatus 600 includes a CPU 610, a storage 620, a memory 630 such as a DRAM, and a NIC 640. The server management device 600 is, for example, a computer.

The storage 620 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 620 stores a function redeployment program 621, a server information management program 622, and a server information table 623.

The server information table 623 stores the processing capacity of the edge servers 300-1 and 2, such as the maximum data amount that can be stored in the edge servers 300-1 and 300 and the maximum processing amount that can be executed. Further, the server information table 623 stores the data amount currently stored, the allocated (deployed) processing amount, and the like. Further, the server management apparatus 600 updates the server information table 623 when the processing amount executed by the edge server 300 or the data amount to be stored changes.

The CPU 610 executes the function redeployment program 621 to construct a receiving unit and perform function redeployment processing. The receiving unit receives a function redeployment request in the function redeployment process. In the function redeployment process, the processing amount executed by each of the cloud server 700 and the edge servers 300-1 and 300-2 and the data amount of data to be stored (stored) are determined, and the determined processing amount and data amount are obtained. This is processing for controlling the cloud server 700 and the edge servers 300-1 and 300-2.

The CPU 610 executes the function redeployment determination module 6211 to construct a migration control unit and perform function redeployment determination processing. In the function redeployment determination process, the migration control unit determines the processing amount and the data amount of each of the cloud server 700 and the edge servers 300-1 and 3002 based on the information stored in the server information table 623.

The CPU 610 executes the function redeployment instruction module 6212 to construct a transmission unit and perform function redeployment instruction processing. In the function redeployment instruction process, the transmission unit is a process for instructing the cloud server 700 and the edge servers 300-1 and 300-2 to transfer data and functions so as to be as determined in the function redeployment determination process. is there.

<Function redeployment process during handover>
FIG. 5 is a diagram illustrating an example of a sequence of function redeployment processing at the time of handover in the wireless communication system 10. The sequence in FIG. 5 is an example of handover initiated by the base station apparatus, but in the case of handover initiated by the terminal apparatus, a handover request is transmitted instead of the terminal information notification transmitted in step S102.

The terminal device 100 is wirelessly connected to the base station device 200-1 (S101). Then, the terminal apparatus 100 transmits a terminal information notification including terminal information to the base station apparatus 200-1 (S102). The terminal information notification is, for example, a measurement report (Measurement Report) in LTE.

The base station apparatus 200-1 that has received the terminal information notification determines handover of the terminal apparatus 100 (S103). The base station apparatus 200-1 has, for example, the radio field intensity from the base station apparatus 200-1 received by the terminal apparatus 100, and the radio field intensity from the base station apparatus 200-2 received by the terminal apparatus 100. Is greater than or equal to the second threshold value, a handover from the base station apparatus 200-1 to the base station apparatus 200-2 is determined. Alternatively, for example, when the radio field intensity from the base station apparatus 200-2 received by the terminal apparatus 100 is greater than the threshold by the base station apparatus 200-2, the base station apparatus 200-1 -1 to the base station apparatus 200-2 is determined to be handed over. The base station apparatus 200-1 transmits a handover request for requesting the handover of the terminal apparatus 100 to the base station apparatus 200-2 that is the handover destination (movement destination) (S104). The handover request is a message including the identifier of the terminal device 100 and the identifiers of the source and destination base station devices 200, for example.

When receiving the handover request, the base station apparatus 200-2 executes a handover request process (S105).

FIG. 6 is a diagram illustrating an example of a process flowchart of a handover request process in the base station apparatus 200. Base station apparatus 200 (base station apparatus 200-2 in FIG. 5) waits for reception of a handover request (No in S1051). Then, when receiving the handover request (Yes in S1051), the base station device 200 transmits the handover request to the wireless connection management device 500 (S1052).

When transmitting the handover request, the base station apparatus 200 waits to receive a handover instruction from the wireless connection management apparatus 500 (No in S1053). Then, when receiving the handover instruction (Yes in S1053), the base station apparatus 200 transmits the handover instruction to the base station apparatus (base station apparatus 200-1 in FIG. 5) that is the transmission source of the handover request (S1054). The handover instruction is a message for instructing the terminal apparatus 100 to be handed over, and includes identifiers of the terminal apparatus 100, the source and destination base station apparatuses. Then, the base station apparatus 200 executes a handover process (also referred to as handover control) according to the handover instruction (S1055).

Returning to FIG. 5, the base station apparatus 200-2 transmits a handover request to the wireless connection management apparatus 500 in the handover request process S105 (S106).

When the wireless connection management device 500 receives the handover request, the wireless connection management device 500 executes function redeployment request processing (S107).

FIG. 7 is a diagram illustrating an example of a process flowchart of a function redeployment request process in the wireless connection management device 500. The wireless connection management device 500 waits for reception of a handover request (No in S1071). When the wireless connection management device 500 receives the handover request (Yes in S1071), the wireless connection management device 500 transmits a function redeployment request to the server management device 600 (S1072). The function redeployment request is, for example, a message including identifiers of the terminal device 100, the source and destination base station devices 200. The function redeployment request is a migration request for requesting the server management apparatus 600 to migrate stored data stored in the edge server 300.

When transmitting the function redeployment request, the wireless connection management device 500 waits to receive a function redeployment completion notification from the server management device 600 (No in S1073). Upon receiving the function redeployment completion notification (Yes in S1073), the wireless connection management device 500 transmits a handover instruction to the base station device (base station device 200-2 in FIG. 5) that has transmitted the handover request. (S1074). The function redeployment completion notification is a message indicating that the data migration and function migration of each server has been completed. The function redeployment completion notification is a migration completion notification indicating the completion of migration control in the server management apparatus 600 for migrating (copying) server accumulated data.

5, the wireless connection management device 500 transmits a function redeployment request to the server management device 600 in the function redeployment request processing S107 (S108).

FIG. 8 is a diagram illustrating an example of a process flowchart of the function deployment process in the server management apparatus 600. The server management apparatus 600 waits for reception of a function redeployment request (No in S1091). When the server management apparatus 600 receives the function redeployment request (Yes in S1091), the server management apparatus 600 corresponds to the accumulated data amount of the terminal apparatus 100 and the destination base station apparatus 200 (base station apparatus 200-2 in FIG. 5). The available capacity of the migration destination edge server 300 (edge server 300-2 in FIG. 5) is compared (S1092). The accumulated data of the terminal device 100 is data accumulated in the source base station device 200 (base station device 200-1 in FIG. 5) or the cloud server 700.

If the amount of accumulated data exceeds the free space of the destination edge server (Yes in S1092), the server management apparatus 600 determines to migrate the accumulated data to the cloud server (S1093). On the other hand, if the amount of accumulated data does not exceed the free capacity of the destination edge server (No in S1092), the server management apparatus 600 determines to migrate (copy) the accumulated data to the destination edge server 300 (S1094). ). The server management apparatus 600 transmits a function redeployment instruction to each server so that the accumulated data is transferred to the determined server (S1095).

When the server management apparatus 600 transmits a function redeployment instruction, the server management apparatus 600 waits for reception of a function redeployment completion notification (No in S1096). The function redeployment completion notification is a message indicating completion of function redeployment of all servers, and waits for reception from all servers that are targets of function redeployment, for example.

When the server management apparatus 600 receives the function redeployment completion notification (Yes in S1096), the server management apparatus 600 transmits a function redeployment completion notification to the wireless connection management apparatus 500 (S1097), and ends the process.

In FIG. 8, the accumulated data is described as an example of the function redeployment target. However, the process deployment of what process is executed on which server may be a target of redeployment. In this case, the server to which the process is to be transferred is determined based on the amount of processing that can be executed by each server.

Referring back to FIG. 5, the server management apparatus 600 transmits a function redeployment instruction to each server in the function redeployment request processing S205 (S110). Then, each server migrates data according to the function redeployment instruction (S111), and after the data migration is completed, transmits a function redeployment completion notification to the server management apparatus 600 (S112). The data migration includes migration of alternative processing executed by the edge server 300.

The server management apparatus 600 receives a function redeployment completion notification in function redeployment processing S109 and transmits a function redeployment completion instruction to the wireless connection management apparatus 500 (S113).

Then, in the function redeployment request processing S205, the wireless connection management apparatus 500 receives the function redeployment completion notification and transmits a handover instruction to the base station apparatus 200-2 (S114).

Then, the base station apparatus 200-2 receives the handover instruction in the handover request process S105 and transmits the handover instruction to the base station apparatus 200-1 (S115). The base station apparatus 200-1 transmits a handover instruction to the terminal apparatus 100 (S116).

The base station devices 200-1 and 200-2 and the terminal device 100 that have received the handover instruction execute a handover process (S117), and the terminal device 100 is wirelessly connected to the base station device 200-2 (S118).

In the first embodiment, before the terminal device 100 executes the handover process, the base station device 200, the wireless connection management device 500, and the server management device 600 respectively redeploy the functions of the terminal device 100 (for example, Wait for the transfer of stored data to complete. Thereby, since the handover of the terminal device 100 is not executed until the function redeployment of the terminal device 100 is completed, the handover of the terminal device 100 is not completed before the function redeployment. That is, the function redeployment is completed when the handover of the terminal device 100 is completed, and the terminal device can enjoy the cloud service received before the handover without interruption even after the handover.

[Second Embodiment]
Next, a second embodiment will be described. In the second embodiment, the base station apparatus 200-1 and the base station apparatus 200-2 conform to different communication standards. In addition, the wireless connection management device 500 may determine handover of the terminal device 100.

<Configuration example of wireless communication system>
FIG. 9 is a diagram illustrating a configuration example of the wireless communication system 10. A radio communication system 10 in FIG. 9 includes a base station apparatus 200-3 instead of the base station apparatus 200-2 in the radio communication system in FIG. Base station apparatus 200-3 conforms to a communication standard different from that of base station apparatus 200-1. For example, base station apparatus 200-1 is an eNodeB in LTE, and base station apparatus 200-3 is an access point in Wi-Fi (Wireless Fidelity). WiFi is a communication standard for short-range wireless communication, for example. On the other hand, LTE is a communication standard having a wider communication area than WiFi.

The case where the terminal device 100 moves from the terminal device 100-b to the terminal device 100-a will be described. When the terminal device 100 moves to the terminal device 100-a, the distance from the base station device 200-1 becomes longer, and the radio wave received from the base station device 200-1 becomes weaker. On the other hand, when the terminal device 100 moves to the terminal device 100-a, the radio wave received from the base station device 200-3 becomes stronger. Therefore, the terminal device 100 changes (moves) the base station device 200 to be wirelessly connected from the base station device 200-1 to the base station device 200-3 in order to continue good wireless communication. In addition, the movement of the terminal device between the base station devices 200 conforming to different standards is expressed as a handover in the same manner as the movement between the base station devices 200 conforming to the same standards.

The wireless connection management device 500 receives terminal information from the terminal device 100, and determines handover of the terminal device 100 from the base station devices 200-1 to 200-3 based on the received terminal information.

<Configuration example of wireless connection management device>
FIG. 10 is a diagram illustrating a configuration example of the wireless connection management device 500. The storage 520 of the wireless connection management device 500 further stores a handover determination module 5212 and a local device initiative function redeployment request module 5213 as modules of the handover request reception program 521.

The CPU 510 executes the handover determination module 5212 to perform a handover determination process. The handover determination process is a process for determining whether or not to hand over the terminal device 100 based on the terminal information received from the terminal device 100.

The CPU 510 makes a self-device-driven function redeployment request by executing the self-device-driven function redeployment request module 5213. The own apparatus initiative function redeployment request process is a process of transmitting a function redeployment request to the server management apparatus 600 when it is determined that the terminal apparatus 100 is to be handed over in the handover determination process.

<Configuration example of terminal device>
FIG. 11 is a diagram illustrating a configuration example of the terminal device 100. The terminal device 100 includes a CPU 110, a storage 120, a memory 130 such as a DRAM, and an RF circuit 150. The terminal device 100 is a mobile communication device such as a smartphone, for example.

The storage 120 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 120 stores a wireless communication program 121, a terminal information notification transmission program 122, and a terminal initiated handover program 123.

The CPU 110 performs a wireless communication process by executing the wireless communication program 121. The wireless communication process is a process of performing wireless communication with a communication destination device of the communication partner of the terminal device 100. The wireless communication process wirelessly connects to the base station apparatus 200, and transmits and receives packets to and from the communication destination apparatus via the base station apparatus 200.

Further, the CPU 110 executes a terminal information notification transmission program 122 to perform terminal information notification transmission processing. The terminal information notification transmission process is a process of acquiring terminal information and transmitting a terminal information notification to the wireless connection management apparatus 500 via the base station apparatus 200.

The CPU 110 executes the terminal information acquisition module 1221 to perform terminal information acquisition processing. The terminal information acquisition process is a process for acquiring terminal information included in the terminal information notification. The terminal information includes, for example, the reception intensity and degree of interference of radio waves transmitted from the connected base station apparatus 200, and the base station apparatus 200 that can acquire radio waves well beyond a predetermined value in addition to the connected base station apparatus 200. Contains an identifier.

Further, the CPU 110 executes the terminal-initiated handover process by executing the terminal-initiated handover program 123. The terminal initiated handover process is a process in which the terminal device 100 takes the initiative to determine handover and transmits a handover request to the base station apparatus 200. The handover process waits for reception of a handover instruction from the base station apparatus 200 that is the handover request transmission destination, and executes the handover process in response to reception of the handover instruction.

<Function redeployment process during handover>
The handover between the base station device 200-1 and the base station device 200-3 according to different communication standards in the terminal device 100 may be led by the radio connection management device 500 or the terminal device 100. Hereinafter, a case where the wireless connection management device 500 is led and a case where the terminal device 100 is led will be described.

<1. Handover processing led by wireless connection management device>
FIG. 12 is a diagram illustrating an example of a sequence of function redeployment processing at the time of handover in the wireless communication system 10. Note that the sequence in FIG. 12 is an example of a sequence when radio connection management apparatus 500 determines to perform handover from base station apparatus 200-1 to 200-2 based on terminal information received from terminal apparatus 100. .

The terminal device 100 is wirelessly connected to the base station device 200-1 (S201). Then, the terminal apparatus 100 transmits a terminal information notification including terminal information to the base station apparatus 200-1 (S202). The terminal information notification in the second embodiment is, for example, a message obtained by extending a measurement report (Measurement Report) in LTE. The terminal information notification includes, for example, the identifier of the base station apparatus 200 to which the terminal apparatus 100 can wirelessly connect, in addition to the information included in the conventional measurement report. The base station device 200 included in the terminal information also includes an identifier of the base station device 200 according to a standard different from that of the base station device 200 with which the terminal device 100 is wirelessly connected.

When the base station device 200-1 receives the terminal information notification, the base station device 200-1 transmits the received terminal information notification to the wireless connection management device 500 (S203).

When receiving the terminal information notification, the wireless connection management device 500 determines to hand over the terminal device 100 based on the terminal information included in the received terminal information notification (S204). The wireless connection management device 500 includes, for example, a base station device 200-2 in which the radio wave condition between the terminal device 100 and the base station device 200-1 is less than a first threshold and the terminal device 100 can be wirelessly connected. In the case, the terminal apparatus is determined to be handed over.

Then, when determining that the terminal device 100 is to be handed over, the wireless connection management device 500 executes its own device initiative function redeployment request processing (S205).

FIG. 13 is a diagram illustrating an example of a processing flowchart of the own device initiative function redeployment request processing in the wireless connection management device 500. When the wireless connection management device 500 determines a handover initiated by itself (the handover determined in the determination process S204) (Yes in S2051), the wireless connection management device 500 transmits a function redeployment request to the server management device 600 (S2052). The function relocation request includes the identifiers of the source base station apparatus 200 (base station apparatus 200-1 in FIG. 12) and the destination base station apparatus 200 (base station apparatus 200-3 in FIG. 12), and the identifier of the terminal apparatus 100. including.

When the wireless connection management device 500 transmits the function redeployment request, the wireless connection management apparatus 500 waits for reception of the function redeployment completion (No in S2053). Upon receiving the function redeployment completion (Yes in S2053), the wireless connection management device 500 receives the handover target terminal device 100 and the base station device 200 to which the terminal device 100 is connected (the base station device 200- in FIG. 12). 1), a handover instruction is transmitted (S2054).

Referring back to FIG. 12, the wireless connection management device 500 transmits a function redeployment request to the server management device 600 in the self device initiative function redeployment request processing S205 (S206).

Thereafter, the processing from S207 to S211 is the same as the processing from S109 to S113 in FIG.

Then, the wireless connection management device 500 receives the function redeployment completion notification in its own device-initiated function redeployment request processing S205 (S211), and transmits a handover instruction to the base station device 200-1 (S212).

When receiving the handover instruction, the base station apparatus 200-1 transmits the handover instruction to the terminal apparatus 100 (S213). The terminal device 100 and the base station device 200-1 that have received the handover instruction execute a handover process (S214), and the terminal device 100 and the base station device 200-3 are wirelessly connected (S215).

Note that the handover instruction may be transmitted to the handover destination base station apparatus 200-3. The base station apparatus 200-3 that has received the handover instruction may wait for a wireless connection request from the terminal apparatus 100 in the handover process S214, or establish a wireless connection with the terminal apparatus 100 led by the base station apparatus 200-3. It may be established.

<2. Handover processing led by terminal device 100>
FIG. 14 is a diagram illustrating an example of a handover sequence between the base station apparatuses 200 led by the terminal apparatus 100 and conforming to different standards. For example, the terminal device 100 determines to perform handover to the base station device 200 conforming to a different standard based on the measured radio wave condition and the acquired terminal information.

The terminal device 100 and the base station device 200-1 are wirelessly connected (S301). For example, the terminal device 100 determines whether or not to perform handover based on the measured radio wave state of the terminal device 100 and information on the base station device 200 that can be wirelessly connected. For example, when the base station device detection radio wave transmitted by the base station device 200 can be received at a predetermined power or higher, the terminal device 100 determines that the terminal device 100 can be wirelessly connected to the base station device that is the source of the detection radio wave.

When determining the handover, the terminal apparatus 100 transmits a handover request to the base station apparatus 200-1 (S302). Then, base station apparatus 200-1 transmits the received handover request to radio connection management apparatus 500 (S303).

When the wireless connection management device 500 receives the handover request, the wireless connection management device 500 executes function redeployment request processing (S304). Thereafter, the processing from S305 to S314 is the same as the processing from S206 to S215 in FIG.

In the second embodiment, the terminal device 100 performs handover between the base station devices 200 according to different standards. The handover between the base station devices 200 according to different standards may be determined by the wireless connection management device 500 based on terminal information, or the terminal device 100 may be determined based on terminal information. In the second embodiment, by not performing the handover until the server redeployment is completed, the cloud service enjoyed by the terminal device 100 is not interrupted even in the handover between the base station devices 200 according to different standards.

<Modification>
The wireless communication system 10 in the first and second embodiments shows an example in which the wireless connection management device 500 and the server management device 600 are two different devices, but the wireless connection management device 500 and the server management device 600 are shown. May be one device (referred to as a central management device).

FIG. 15 is a diagram illustrating an example of a handover sequence when the wireless connection management device 500 and the server management device 600 in FIG. 14 are replaced with a central management device. Processes S301 to S303 are the same as the sequence in FIG.

When receiving the handover request (S303), the central management apparatus performs function redeployment request processing (S400). The function redeployment request process S400 is a process of determining the function redeployment and controlling the server so as to be as determined. Further, the function redeployment request processing S400 waits for reception of a function redeployment completion notification indicating completion of server control (accumulation of stored data copying and transfer). Thereafter, the processing from S307 to S314 is the same as the sequence of FIG.

As described above, the central management apparatus hands over the terminal apparatus 100 after the function redeployment is completed. Thereby, the terminal device can enjoy the cloud service without interruption. For example, when the wireless connection management device 500 and the server management device 600 are installed adjacent or close to each other, or when the wireless connection management device 500 and the server management device 600 are managed by the same user, they may be replaced with a central management device. . By replacing the central management device with the central management device, message transmission / reception between the wireless connection management device 500 and the server management device 600 can be reduced, and the time from the completion of function redeployment to the handover instruction can be shortened.

10. Wireless communication system
100 ... Terminal device 110 ... CPU
120 ... Storage 121 ... Wireless communication program
122 ... Terminal information notification transmission program 1221 ... Terminal information acquisition module
123 ... Terminal initiated handover program 130 ... Memory
150 ... RF circuit 200 ... Base station apparatus
210 ... CPU
220 ... Storage
221 ... Wireless communication program 222 ... Handover program
2221 ... Terminal initiated handover module 2222 ... Base station initiated handover module 2223 ... Handover request module
230 ... Memory 240 ... NIC
250 ... RF circuit 300 ... Edge server
400 ... Cloud computing system 500 ... Wireless connection management device
510 ... CPU
520 ... Storage
521 ... Handover request reception program 5211 ... Function redeployment request module
5212 ... Handover determination module 5213 ... Self-device-driven function redeployment request module 522 ... Terminal information management program
523 ... Terminal information table 530 ... Memory
600 ... Server management device 610 ... CPU
620 ... Storage 621 ... Function redeployment program
6211 ... Function redeployment determination module 6212 ... Function redeployment instruction module
622 ... Server information management program 623 ... Server information table
630 ... Memory 640 ... NIC
700 ... Cloud server

Claims

A plurality of base station devices that wirelessly connect to the terminal device and relay communication of the terminal device;
A plurality of edge servers that are provided in association with each of the plurality of base station devices and store part or all of the data used in the communication;
A server management device that stores correspondence between the plurality of edge servers and the plurality of base station devices, and manages data stored in each of the edge servers;
A wireless connection management device that manages a handover in which the terminal device moves through a base station device to be wirelessly connected;
When the terminal device is handed over, the wireless connection management device transmits a migration request for data stored in each of the edge servers to the server management device,
In response to the migration request, the server management device sends the source edge server to the source edge server based on information about the source edge server corresponding to the source base station device and the destination edge server corresponding to the destination base station device. Performs migration control of the accumulated data of the terminal device that has been accumulated, transmits a migration completion notification indicating completion of the migration control to the wireless connection management device,
The wireless connection management device is a wireless communication system that executes handover control for handing over the terminal device in response to the transition completion notification.
The wireless connection management device includes:
When a handover request for requesting handover of the terminal device is received from the destination base station device or the source base station device, the transition request is transmitted to the server management device,
The radio communication system according to claim 1, wherein, in the handover control, a handover instruction for instructing execution of handover of the terminal apparatus is transmitted to a base station apparatus that is a transmission source of the handover request.
The wireless communication system according to claim 2, wherein the handover request includes identifiers of the source and destination base station devices.
The wireless connection management device includes:
Terminal information including a radio wave state in the terminal device and information on a base station device to which the terminal device is wirelessly connectable is received from the terminal device, and based on the received terminal information, the terminal device is determined to be handed over When sending the migration request to the server management device,
The radio communication system according to claim 1, wherein, in the handover control, a handover instruction for instructing execution of handover of the terminal apparatus is transmitted to the source base station apparatus.
The wireless connection management device determines that the terminal device is to be handed over when a good degree of the radio wave state is smaller than a first threshold and there is a base station device to which the terminal device can be wirelessly connected. Communications system.
The radio communication system according to claim 4, wherein the handover instruction includes identifiers of the source and destination base station devices.
The wireless communication system according to claim 1, wherein the server management apparatus copies the accumulated data to the destination edge server in the migration control.
The information on the source edge server and the destination edge server is a free capacity that can be stored in each of the plurality of edge servers managed by the server management device,
In the migration control, the server management device copies the accumulated data to the destination edge server when the amount of the accumulated data is equal to or less than the free capacity of the destination edge server, and the amount of the accumulated data 2. The wireless communication system according to claim 1, wherein the stored data is copied to a communication destination server that stores all of the data used in the communication when is larger than a free capacity of the destination edge server.
The wireless communication system according to claim 1, wherein the source base station apparatus and the destination base station apparatus perform wireless communication according to different communication standards.
The wireless communication system according to claim 9, wherein the different communication standards are a communication standard for short-range wireless communication and a communication standard for wireless communication over a wider area than the short-range wireless communication.
The wireless communication system according to claim 1, wherein the migration request includes identifiers of the source and destination base station devices.
The data used for the communication includes data transmitted and received by the terminal device in the communication.
The wireless communication system according to claim 1.
The wireless data according to claim 1, wherein the data used for the communication includes an application program for processing executed by the edge server in place of the communication destination server that stores all of the data used for the communication. Communications system.
A plurality of base station devices that wirelessly connect to the terminal device and relay communication of the terminal device;
A plurality of edge servers that are provided in association with each of the plurality of base station devices and store part or all of the data used in the communication;
A server management device that stores correspondence between the plurality of edge servers and the plurality of base station devices, and manages data stored in each of the edge servers;
A wireless connection management device included in a wireless communication system having a wireless connection management device that manages a handover in which a mobile station moves through a base station device to which the terminal device is wirelessly connected,
When the terminal device is handed over, a migration request transmission unit that transmits a migration request for data stored in each of the edge servers to the server management device;
Receiving a transition completion notification transmitted from the server management device, and having a transition completion notification receiving unit for handing over the terminal device;
The migration completion notification is transmitted from the server management apparatus in response to the migration request, and is based on information on a migration source edge server corresponding to a migration source base station apparatus and a migration destination edge server corresponding to a migration destination base station apparatus. A wireless connection management device indicating completion of migration control of stored data of the terminal device stored in the source edge server.
A plurality of base station devices that wirelessly connect to the terminal device and relay communication of the terminal device;
A plurality of edge servers that are provided in association with each of the plurality of base station devices and store part or all of the data used in the communication;
A server management device that stores correspondence between the plurality of edge servers and the plurality of base station devices, and manages data stored in each of the edge servers;
A server management apparatus included in a wireless communication system having a wireless connection management apparatus that manages a handover in which the terminal apparatus moves wirelessly in a base station apparatus,
A receiving unit that receives a migration request for data stored in each of the edge servers transmitted by the wireless connection management device;
In response to the migration request, based on information about the source edge server corresponding to the source base station device and the destination edge server corresponding to the destination base station device, the terminal device stored in the source edge server A migration control unit for performing migration control of stored data;
A transmission completion notification that indicates completion of the transition control, and a transmission unit that transmits the transition completion notification to the radio connection management apparatus for causing the radio connection management apparatus to perform handover control for handing over the terminal apparatus. Management device.
A plurality of base station devices that wirelessly connect to the terminal device and relay communication of the terminal device;
A plurality of edge servers that are provided in association with each of the plurality of base station apparatuses, and store a part or all of data transmitted and received by the communication;
A server management device that stores correspondence between the plurality of edge servers and the plurality of base station devices, and manages data stored in each of the edge servers;
An edge server switching method in a wireless communication system having a wireless connection management device that manages a handover in which a mobile station moves through a base station device to which the terminal device is wirelessly connected,
When the terminal device is handed over by the wireless connection management device, it transmits a migration request for data stored in each of the edge servers to the server management device,
In response to the migration request by the server management apparatus, based on the information on the movement source edge server corresponding to the movement source base station apparatus and the movement destination edge server corresponding to the movement destination base station apparatus, Performs migration control of the accumulated data of the terminal device that has been accumulated, transmits a migration completion notification indicating completion of the migration control to the wireless connection management device,
An edge server switching method for executing handover control for handing over the terminal device in response to the transition completion notification by the wireless connection management device.