JP2017157950A - Session control method and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain session information of a terminal application even when a handover of terminals occurs when applying edge computing to a mobile communications network.SOLUTION: In a communication system 1 configured by including multiple processing servers (e.g., virtual machines 50), a terminal-side session maintenance proxy server (Proxy 90 of solid line) terminating a session between a terminal 70 and a virtual machine (VM3) accommodating the terminal 70 and holding session information of an application at a terminal side is set to the terminal 70. In the case where the terminal 70 is moved and accommodated in a new virtual machine (VM2), session movement processing of the terminal-side session maintenance proxy server is executed while following the movement of the terminal 70, thereby setting a new terminal-side session maintenance proxy server (Proxy 90 of broken line) to the terminal that is accommodated in the new virtual machine (VM2).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a session control method and a communication system when edge computing is applied to a mobile communication network.

  Conventionally, edge computing that reduces communication delay compared to a cloud computing environment that is centrally deployed on a global scale by distributing processing to edge servers near the terminal (smartphone, etc.) on the network. Technology has been considered (Non-Patent Document 1).

“Edge Computing Concept”, [online], NTT Holding Company News Release, [Search June 18, 2015], Internet <http://www.ntt.co.jp/news2014/1401/140123a.html>

  When the above-described edge computing is applied to a mobile communication network, the mobile communication network has a characteristic that the location information of the terminal changes as the terminal moves (occurrence of handover). Therefore, when the processing server (edge server) that accommodates the terminal is changed due to the handover of the terminal, the session between the terminal and the processing server (for example, TCP (Transmission Control Protocol)) unless the processing server performs live migration. Session or SCTP (Stream Control Transmission Protocol) session is disconnected.

  One way to deal with this problem is to use stateless UDP (User Datagram Protocol) as a protocol. However, although it has low latency, it is not practical because it requires redevelopment of applications on the terminal and server sides. Absent. In addition, there is a measure to enable session reconnection even if the session is disconnected, but it may take time to reconnect the session, and if the session reconnection occurs during application processing, it is necessary to repeat the process. There is a problem that a large service stop time may occur.

  Accordingly, an object of the present invention is to maintain session information of an application of a terminal even when a handover of the terminal occurs when edge computing is applied to a mobile communication network.

  A session control method according to the present invention is a session control method that is executed in a communication system including a plurality of processing servers that accommodates terminals located in a pre-assigned area and performs processing related to the terminals. A terminal-side session maintenance proxy server that terminates a session between a terminal and a processing server that accommodates the terminal and holds session information of the application on the terminal side is set for the terminal, and the terminal When moved and accommodated in the new processing server, the movement processing of the session of the terminal side session maintenance proxy server set for the terminal is executed following the movement of the terminal. A terminal-side session maintenance proxy server is set for a terminal accommodated in a simple processing server.

  As described above, a terminal-side session maintenance proxy server that terminates the session between the terminal and the processing server that accommodates the terminal and holds the session information of the terminal-side application is set for the terminal, When the terminal is moved and accommodated in a new processing server, following the movement of the terminal, by executing the movement process of the session of the terminal side session maintenance proxy server set for the terminal, A terminal-side session maintenance proxy server is set for the terminal accommodated in the new processing server. Thus, even when a terminal handover occurs, the session information of the terminal application can be maintained, and the terminal application can be executed without being aware of the handover.

  In the session control method according to the present invention, the processing server side session maintenance proxy server that terminates the session between the terminal and the processing server that accommodates the terminal and holds the session information of the application on the processing server side, It may be set between the terminal side session maintenance proxy server set for the terminal and the processing server. In this case, even when a terminal handover occurs, the session information of the application on the processing server side can be maintained, and the application on the processing server side can be executed without being aware of the handover.

  Regarding the setting of the terminal-side session maintenance proxy server, a terminal-side session maintenance proxy server that can be connected from any terminal is set, and when a connection request is received from the terminal, The terminal-side session maintenance proxy server may be connected, and a new terminal-side session maintenance proxy server may be additionally set for a connection request from the next terminal. In this case, the terminal-side session maintenance proxy server can be appropriately set according to the connection request from the terminal.

  By the way, the present invention relating to the session control method can be described as the invention relating to the communication system as follows, and has the same operations and effects.

  A communication system according to the present invention is a communication system configured to include a plurality of processing servers that accommodate a terminal located in a pre-allocated area and perform processing related to the terminal, the terminal and the terminal being connected to each other. A terminal-side session maintenance proxy server that terminates a session with a processing server to be accommodated and retains session information of the terminal-side application is configured for the terminal, and the terminal moves When accommodated in the new processing server, the movement processing of the session of the terminal side session maintenance proxy server set for the terminal is executed following the movement of the terminal, whereby the new processing server A terminal-side session maintenance proxy server is configured for a terminal accommodated in the terminal.

  According to the present invention, when edge computing is applied to a mobile communication network, it is possible to maintain session information of a terminal application even when a terminal handover occurs.

(A) is a figure which shows the structural example of the communication system of embodiment of invention, (b) is a figure which shows the proxy set for every terminal. It is a figure which shows the hardware structural example of a virtual machine or a physical machine. (A) is a figure which shows an address setting condition, (b) is a figure which shows an address setting condition when it sees from the application of a terminal. It is a flowchart which shows a transmission process. (A) is a figure which shows the example of a table of DPI, (b) is a figure which shows the example of a table of an open flow switch. It is a flowchart which shows a reply process. It is a figure which shows the example of a table of GTP. It is a figure for demonstrating a movement process. It is a flowchart which shows a movement process. (A) is a figure which shows the example of a GTP table of a movement origin, (b) is a figure which shows the example of a table of GTP of a movement destination, (c) is a figure which shows the example of a table of DPI of a movement source. (D) is a figure which shows the example of a table of DPI of a movement destination, (e) is a figure which shows the example of a table of the movement source OpenFlow switch, (f) is a table example of the movement destination OpenFlow switch. FIG. (A) is a figure for demonstrating the case where VM on WAN is used without using an edge server, (b) is a figure which shows the proxy set for every terminal. It is a flowchart which shows the process at the time of the first connection. (A) is a figure which shows the 1st phase of the first connection, (b) is a figure which shows the 2nd phase of the first connection. (A) is a figure which shows the 3rd phase of the first connection, (b) is a figure which shows the 4th phase of the first connection. (A) is a system configuration | structure figure in the modification 1, (b) is a figure which shows the proxy set for every terminal. (A) is a figure for demonstrating the modification 2, (b) is a figure for demonstrating an authentication function. (A) is a figure in case an OpenFlow switch is used, (b) is a figure for demonstrating the modification 3, (c) is a figure which shows the table of a DNS server.

  Hereinafter, embodiments of a session control method and a communication system according to the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1A shows a configuration example of a communication system 1 according to an embodiment of the invention. The communication system 1 is a communication system in the case where edge computing is applied to a mobile communication network. As shown in FIG. 1A, a gateway connected to an external network (in this case, a WAN (Wide Area Network) 10). PGW (Packet data network GateWay) 20 that functions as a plurality of, a plurality of SGW (Serving GateWay) 30 that functions as a serving packet switch in a mobile communication network, and a plurality of packets that analyze the contents of packet data flowing through the mobile communication network A DPI (Deep Packet Inspection) 40, a plurality of processing servers (edge servers) 50, an eNodeB (hereinafter referred to as “eNB”) 60 corresponding to a base station in a mobile communication network, and a terminal (User Equipment, hereinafter “UE”) 70) and a mobile test for detecting a handover due to the movement of the UE based on a signal in the mobile communication network. And a terminal-side session maintenance proxy server (hereinafter referred to as “Proxy” or “UE-side Proxy”) 90 that terminates the UE-VM session and holds session information of the UE-side application. The The processing server is normally executed as a virtual machine, but may be executed as a physical machine. In the present embodiment, the processing server is described on the assumption that it is executed as a virtual machine (hereinafter referred to as “VM”).

  The various devices described above are directly or indirectly connected to each other as shown in FIG. Note that the mobile detector 80 can acquire handover information including the source eNB and the destination eNB from the mobile core network configured to include the PGW 20 and the SGW 30, and the eNB 60, Signals can be transmitted and received by connecting to each of the Proxy 90, the PGW 20 and the SGW 30.

  For convenience of explanation, a plurality of VMs are illustrated as VM1 to VM3, and a UE is illustrated as UE1. As shown in FIG. 1A, the VM 3 accommodates the UE 1 located in the area allocated to the VM 3, and executes various processes according to the service request from the UE 1 as an edge in edge computing. .

  The Proxy under VM3 is set for each UE in the area, and as shown in FIG. 1B, a plurality of Proxy (for example, Proxy-1 to Proxy-3) and a packet according to the source UE. And an open flow switch 95 for distributing the transfer destinations.

  In addition, PGW20, SGW30, VM50, eNB60, UE70, the movement detector 80, and Proxy90 of Fig.1 (a) are comprised by the general computer provided with the communication function. For example, as shown in FIG. 2, these devices (collectively referred to as the device 100) include one or more CPUs 101, a RAM (Random Access Memory) 102 and a ROM (Read Only Memory) 103, which are main storage devices, and communication. The communication module 104 (Transmitter or Receiver) for performing, and one or a plurality of computers including hardware such as an auxiliary storage device 105 (Memory) such as a hard disk. In the apparatus 100, predetermined computer software is read on the hardware such as the CPU 101 and the RAM 102 shown in FIG. 4 to operate the communication module 104 and the like under the control of the CPU 101, and in the RAM 102 and the auxiliary storage device 105. A series of functions in each unit is realized by reading and writing data.

  Note that a processor (Processor) such as the CPU 101 may be configured to execute all or part of its functions by a dedicated integrated circuit (IC). For example, the above functions may be executed by constructing a dedicated integrated circuit for performing image processing and communication control.

  Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

  FIG. 3A shows an address setting situation, and the same IP address (Local IP1) is set in a plurality of VM1 to VM3. However, when a processing request is sent from the UE1 application, the source address may be set to “UE-IP1” and the destination address may be set to “SV-IP”. From the viewpoint of the UE1 application, FIG. What is necessary is just to mount as address setting like b). Note that the IP addresses (Local IP1) of the plurality of VM1 to VM3 are not necessarily the same, but if they can be unified, the initial setting of the application becomes easy.

  In the present embodiment, an example in which the packet of the destination address “SV-IP” from the UE 1 is acquired by the right DPI 40 in FIG. 3A and transferred to the Proxy 90 in FIG. explain. However, the present invention is not limited to this method, and any configuration may be used as long as the IP addresses of the UE and the VM are continued even after the UE handover.

(Transmission process)
First, the packet transmission process from UE1 is demonstrated using FIG. The application of UE1 transmits a packet in the same manner as communicating with VM1 of the external data center. Specifically, the packet is transmitted with the source address set to “UE-IP1” and the destination address set to “SV-IP” (step S1). The transmitted packet reaches the DPI via the eNB.

  The DPI stores a table shown in FIG. 5A in advance, and refers to the table to determine whether or not to transfer to the Proxy based on the packet destination information and source information (step S2). For example, the DPI analyzes the received packet and, as in the example of FIG. 5A, the destination address (server address) “SV-IP” and the source address (UE address) “UE” of the IP header. If the proxy corresponding to the combination of “-IP1” has already been registered, the proxy is transferred to the registered proxy (step S3).

  The packet transferred toward the Proxy is input to the OpenFlow switch 95 in FIG. The OpenFlow switch 95 stores a table shown in FIG. 5B in advance, and refers to the table to refer to the proxy (IP address) associated with the source address (UE address) “UE-IP1” in the IP header. Here, the packet is transferred to “Proxy-1”) (step S4).

  Proxy-1 then performs IP masquerading processing using NAT (Network Address Translation) to change the packet destination address to “Local IP1”, which is the address of VM3 (step S5), and forwards the packet to VM3. (Step S6). Accordingly, the VM 3 receives a packet whose source address is UE-IP1 and whose destination address is Local IP1.

(Reply process)
Next, packet return processing from the VM 3 will be described with reference to FIG. The VM 3 sets the transmission source address to “Local IP1” and the transmission destination address to “UE-IP1” for the packet to be returned, and returns the packet to Proxy1 (step S11). Proxy1 changes the source address to “SV-IP” by NAT processing for the returned packet (step S12), and transfers the changed packet to the OpenFlow switch 95 (step S13). At this time, as viewed from the open flow switch 95, the downlink direction (return direction to UE1) is transferred from a plurality of transmission sources (Proxy) to one transmission destination (UE1). The distribution of the packet transfer destination by the flow switch 95 is not necessary. Therefore, the OpenFlow switch 95 transfers the transferred packet as it is to the DPI (Step S14).

  The DPI performs an appropriate GTP (GPRS Tunneling Protocol) tunnel process on the transferred packet (step S15), and transfers the processed packet to the eNB. The DPI stores the GTP table shown in FIG. 7 in advance, and corresponds to the GTP tunnel (for example, destination address (UE address) UE-IP1) to be applied to the packet by referring to the table in step S15. The attached GTP1) is selected, and GTP tunnel processing based on the selected GTP tunnel is performed. Thereafter, the packet reaches the destination UE1 via the eNB (step S16). Thereby, the application of UE1 receives a packet similar to the packet returned from VM1 of the external data center, that is, a packet in which the source address is set to SV-IP and the destination address is set to UE-IP1. It will be.

(Move process)
Next, the movement process when the UE 1 moves and a handover occurs will be described. As shown in FIG. 8, when UE1 accommodated in VM3 moves and is about to be accommodated in VM2, it follows the movement of UE1 and is set for the source UE1 in FIG. By executing the session migration process of Proxy (movement source Proxy) shown in FIG. 8, a Proxy (movement destination Proxy) indicated by a solid line in FIG. 8 is set for UE1 that is about to be accommodated in VM2. Hereinafter, an example in which live migration is executed will be described as the “session movement process”. However, this is not essential, and session migration processing includes, in addition to live migration, inheriting session information in the elastic core architecture, a session re-establishment procedure prepared in the protocol, and the like.

  FIG. 8 also shows the address setting status after movement, and the same IP address (Local IP1) is set for a plurality of VM1 to VM3 as in the address setting status before movement shown in FIG. When a processing request is sent from the UE1 application, the source address is set to “UE-IP1” and the destination address is set to “SV-IP”. The UE1 application is the same as before the movement. The address setting as shown in FIG. 3B may be implemented.

  Hereinafter, the movement process will be described with reference to FIG. When the UE1 accommodated in the VM3 starts moving (step S21) and is about to be accommodated in the VM2, the mobile detector is the source eNB from the mobile core network side (such as the PGW 20 and the SGW 30 in FIG. 1), for example. The movement of UE1 is detected based on the handover start notification of UE1 from to the destination eNB (step S22). At this time, the movement detector detects the target movement source VM (VM3) and the movement destination VM (VM2) from the information of the movement source eNB and the movement destination eNB, and determines the movement source Proxy and the movement destination of the object. To do. Further, the movement detector issues a movement instruction including the movement destination information to the movement source Proxy (in this case, a live migration instruction from VM3 to VM2) (step S23).

  Thereby, the proxy live migration (migration process) from VM3 to VM2 is executed (step S24). Specifically, the deletion of the source proxy related flow in the source open flow switch based on the start of deletion of the source proxy (step S25) and the flow table modification instruction to the source open flow switch (step S26) is specifically included. (Step S27) is executed. Further, the addition of the destination proxy (step S28) and the addition of the destination proxy related flow in the destination open flow switch (step S30) based on the flow table modification instruction to the destination open flow switch (step S29) are executed. The In the process of adding the destination proxy in step S28, an authentication process may be executed as necessary. Then, a session is generated between the migration destination Proxy and the migration destination VM 2 (Step S31). Thereafter, when the movement processing completion at the movement destination Proxy is notified from the movement destination Proxy to the movement source Proxy (Step S32), the movement processing completion is further notified from the movement source Proxy to the movement detector (Step S33). After this notification, the deletion of the source proxy is completed.

  The packet transmitted from UE1 to the source eNB in the middle of the handover is transferred from the source eNB to the destination eNB based on the standard specifications as shown by the broken line in step S34 in FIG. The data is transferred to the handover destination VM 2 via the DPI, the destination open flow switch, and the destination proxy. Thus, the packet transmitted from UE1 to the source eNB in the middle of the handover is redirected to the handover destination VM2.

  FIG. 9 shows a case where a packet to be redirected occurs after a session between the destination proxy and the handover destination VM 2 is generated, but the destination proxy and the handover destination VM 2 If a packet to be redirected occurs before the session between is generated, the destination proxy temporarily stores the packet, and the packet is transferred to VM2 as soon as the session with VM2 is generated. That's fine.

  After the movement of UE1 is completed (step S35), the packet from UE1 is transmitted to the handover destination VM2 via the destination eNB, destination DPI, destination open flow switch, destination proxy. (Step S36: normal transmission).

  Along with the live migration of the migration source proxy as described above, the values of various tables are moved (actually, addition to the migration destination and deletion from the migration source) as follows. Specifically, with respect to the GTP table, as shown in FIG. 10A, the data related to UE1 is deleted from the source GTP table by the source DPI, and as shown in FIG. Data on UE1 is added to the GTP table by the destination DPI. As for the DPI table, data relating to UE1 is deleted from the source DPI table as shown in FIG. 10C by the source DPI, and UE1 is added to the destination DPI table as shown in FIG. Is added by the destination DPI. Similarly, with respect to the OpenFlow switch table, as shown in FIG. 10E, the data related to UE1 is deleted from the source OpenFlow switch table by the source OpenFlow switch, and as shown in FIG. Data on UE1 is added to the table of the destination open flow switch by the destination open flow switch. Since the movement source DPI is on a route in the middle of the transfer of the movement instruction in step S23 of FIG. 9, it is possible to recognize the live migration of the movement source Proxy at the time of the transfer. Since the movement destination DPI is on a route in the middle of the transfer of the movement processing instruction in step S24 of FIG. 9, it is possible to recognize the live migration of the movement source proxy at the time of the transfer.

(When using VM1 on WAN without using edge server)
The processing request from UE1 can be processed using VM1 on the WAN without using the edge server (VM2 or VM3 in FIG. 11A). In this case, with regard to the Proxy in FIG. 11A, in practice, as shown in FIG. 11B, the same IP (SV-IP) Proxy is set by the number of UEs, and the OpenFlow switch 95 sets the packet transmission source. A configuration in which packets are distributed according to addresses can be employed.

  However, when VM1 on the WAN is used, it is estimated that the delay generated on the network path is relatively large. Therefore, the configuration is not as shown in FIG. It is good also as a structure which cut | disconnects once and respond | corresponds. With such a configuration, the delay can be reduced.

(Processing at the first connection)
Hereinafter, the process at the time of the first connection will be described by taking as an example the case of using VM1 on the WAN. Here, as shown in FIG. 13 (a), only one Proxy is set first, and an OpenFlow switch table is set so that a connection request from an arbitrary source address is transferred to the one Proxy. Keep it.

  When a connection request to the VM1 on the WAN is transmitted from the UE1 (step S41 in FIG. 12), the connection request reaches the WAN via the eNB, is routed by the WAN (step S42), and is transferred to the OpenFlow switch 95. (Step S43). As shown in FIG. 13B, the open flow switch 95 transmits the connection request to the standby proxy (proxy set first) at that time (steps S44 and S45). Then, as shown in FIG. 14 (a), the first set Proxy newly establishes Proxy2 that waits for a packet from a transmission source other than UE1 (step S46), and a packet from a transmission source other than UE1 is newly installed Proxy2 The flow in the open flow switch 95 is modified so as to be transferred to This is performed via an open flow controller (not shown) that manages the open flow switch 95 (step S47). In response, in the open flow switch 95, the standby proxy in the flow is modified to Proxy2 (step S48).

  Further, the Proxy set first transmits the connection request to the VM 1 (Step S49), and sends a connection reply indicating that the connection is complete to the UE 1 (Step S50). Further, a connection reply indicating that the connection is completed is sent from the VM 1 to the Proxy set first (step S51).

  As described above, a normal connection is realized between the UE1 and the VM1 at the time of the first connection. If the connection reply from the VM 1 in step S51 in FIG. 12 indicates that the connection has failed, the connection between the Proxy and the UE 1 set first may be disconnected. In the above, the case of using the VM1 on the WAN has been exemplified, but the above-described series of processing can also be applied when using the VM2 and VM3 connected via the DPI.

  FIG. 12 shows an example in which only one proxy is set at the beginning and a new proxy is set when the first connection request is transferred to the proxy. In this case, it is desirable to set so that one or more proxies remain as standby proxies. In particular, when a large number of connection requests are expected, it is desirable to set the number of proxies including the number that can accept these connection requests and the number that remains as standby proxies.

  In addition, in steps S45 to S47 of FIG. 12, an example is shown in which one standby proxy is newly installed. In this case, if a plurality of connection requests are received before steps S45 to S47 are completed, the second and subsequent steps are performed. Since the connection request cannot be immediately responded, the second and subsequent connection requests are discarded. However, in order to avoid this situation, it is desirable to prepare many standby proxies. Alternatively, the second and subsequent connection requests may be dropped to wait for retransmission from the eNB, and in the meantime, further establishment processing of the standby proxy may be advanced.

  According to the present embodiment described above, when edge computing is applied to a mobile communication network, it is possible to maintain session information of an application on the UE side even when a UE handover occurs. .

(Modification 1)
The Proxy described in the above embodiment is a UE-side Proxy that terminates a session between a UE and a VM that accommodates the UE and holds session information of a UE-side application. As shown, in addition to the UE-side Proxy, the VM-side Proxy that terminates the session between the UE and the VM that accommodates the UE and holds the session information of the VM-side application (the “virtual machine-side session maintenance proxy of the present invention” Server ”) may be set between the UE-side Proxy and the VM. As shown in FIG. 15A, one VM-side proxy is set for each of VM1 to VM3. As shown in FIG. 15B, the UE-side Proxy is set for each UE in the area, whereas only one VM-side Proxy is set for the VM (VM3) that accommodates the UE. One of them holds sessions for the number of users. For example, IP addresses and ports are prepared for the number of users, and managed by linking them to the user-side proxy. This session continues even if the user moves, and the VM can maintain the session.

  In this case, even when a UE handover occurs, there is an advantage in that the VM side application session information can be maintained and the VM side application can be executed without being aware of the handover. .

(Modification 2)
The Proxy (UE-side Proxy holding session information of the UE-side application) in the above embodiment may be set on the UE as shown in FIG. In this case, it is not necessary to move the Proxy following the movement of the UE.

  However, since the Proxy is set on the UE, it may be used for an attack such as using a modified Proxy by the user of the UE. There are several types of attacks here, but at least authentication between Proxy and VM is indispensable to prevent impersonation. The authentication process at that time may be executed by the authentication function unit 55 provided in the VM shown in FIG. 16B, or may be executed by an authentication function unit provided outside the VM. When a handover of the UE occurs, it is necessary to take over authentication information between the authentication function unit of the handover source VM and the authentication function unit of the handover destination VM.

(Modification 3)
In the above embodiment, an example is shown in which the OpenFlow switch 95 shown in FIG. 17A distributes packets to the Proxy corresponding to the source address. However, it is not essential to use OpenFlow for packet distribution. You may use the method of. For example, the DNS server 96 shown in FIG. 17B that stores the table of FIG. 17C in advance identifies the Proxy corresponding to the address of the source UE by referring to the table, and uses the switch 97. The packet may be distributed to the specified proxy.

  Note that the “information” described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

  As used herein, the term “determination” encompasses a wide variety of actions. “Judgment” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, searching in a table, database, or another data structure) ), Ascertaining, and the like. Also, “determining” can include receiving (eg, receiving information), accessing (eg, accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, selecting, establishing, comparing, and the like.

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

  Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... WAN, 20 ... PGW, 30 ... SGW, 40 ... DPI, 50 ... VM, 55 ... Authentication function part, 60 ... eNB, 70 ... UE, 80 ... Mobile detector, 90 ... UE side Proxy 95 ... Open flow switch, 96 ... DNS server, 97 ... Switch, 100 ... Device, 101 ... CPU, 102 ... RAM, 103 ... ROM, 104 ... Communication module, 105 ... Auxiliary storage device.

Claims (4)

A session control method executed in a communication system configured to include a plurality of processing servers that accommodate a terminal located in a pre-assigned area and perform processing related to the terminal,
A terminal-side session maintenance proxy server that terminates a session between a terminal and a processing server that accommodates the terminal and holds session information of the application on the terminal side is set for the terminal,
When the terminal moves and is accommodated in a new processing server, the movement process of the session of the terminal side session maintenance proxy server set for the terminal is executed following the movement of the terminal. A terminal-side session maintenance proxy server is set for the terminal accommodated in the new processing server,
The session control method characterized by the above-mentioned. A processing server side session maintenance proxy server that terminates a session between a terminal and a processing server that accommodates the terminal and holds session information of the application on the processing server side is set for the terminal. Set between a proxy server and the processing server;
The session control method according to claim 1, wherein: For the setting of the terminal side session maintenance proxy server,
Set up a terminal-side session maintenance proxy server that can be connected from any terminal,
When a connection request is received from a terminal, the terminal is connected to the terminal-side session maintenance proxy server that has been set, and a new terminal-side session maintenance proxy for a connection request from the next terminal The server is additionally configured,
The session control method according to claim 1 or 2, characterized in that A communication system configured to include a plurality of processing servers that accommodate a terminal located in a pre-assigned area and perform processing related to the terminal,
A terminal side session maintenance proxy server that terminates a session between a terminal and a processing server that accommodates the terminal and holds session information of the application on the terminal side is configured for the terminal,
When the terminal moves and is accommodated in a new processing server, the movement process of the session of the terminal side session maintenance proxy server set for the terminal is executed following the movement of the terminal. A terminal-side session maintenance proxy server is configured for a terminal accommodated in the new processing server.
A communication system characterized by the above.

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