KR101641791B1 - Communication system, control method thereof, recording medium for recording program for executing the control method, application saved in the recording medium for executing the control method being combined with hardware - Google Patents

Abstract

The present invention relates to a communication system and a control method thereof, a recording medium on which a program for executing the control method is recorded, and an application stored in the medium in combination with hardware for executing the control method. A control method of a communication system according to the present invention includes: determining whether the SGW is a subscriber relocation situation; The SGW transmits a first session delete message corresponding to all sessions to the PGW and a second session delete message corresponding to all sessions to the MME when the subscriber relocation status is determined as a result of the step .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a communication system and a control method thereof, a recording medium on which a program for executing the control method is recorded, FOR EXECUTING THE CONTROL METHOD, APPLICATION SAVED IN THE RECORDING MEDIUM FOR EXECUTING THE CONTROL METHOD BEING COMBINED WITH HARDWARE}

The present invention relates to a communication system, a control method thereof, a recording medium on which a program for executing the control method is recorded, and an application stored in a medium for executing the control method in combination with hardware, A recording medium on which a program for executing the control method is recorded, and an application stored in the medium in order to execute the control method in combination with the hardware.

An example of an LTE (Long Term Evolution) communication system is shown in FIG.

The MME (Mobility Management Entity) corresponds to a core network structure in a 3GPP LTE (Long Term Evolution) network. The MME corresponds to a mobile communication terminal such as a mobile phone or a smart phone, A node that handles a control plane in an EPC (Evolved Packet Core), is a component that performs connection and release of a bearer to an MS, performs transition from an IDLE state to an ACTIVE state, and performs security key management, SGW (Serving Gateway) is a node that handles the user plane for LTE RAN (Radio Access Network) in EPC. It supports mobility when mobile terminal moves on eNodeB, supports mobility between LTE and GSM / GPRS / HSPA , And collects billing and statistical information. The Packet Data Network Gateway (PGW) is a node that connects to a packet-switching network such as the Internet in an EPC. Is a component that performs the assignment of the IP address and so on.

However, a subscriber relocation operation may be required during the operation of the LTE system.

Here, the subscriber relocation refers to a process of replacing a component that provides a service to a subscriber using a current user terminal.

For example, when a communication session via a specific SGW (for example, the first SGW) is established with respect to the current subscriber and an abnormality occurs in the first SGW, or when an SGW For example, a second SGW).

The 3rd Generation Partnership Project (3GPP) defines a bearer or session deletion procedure triggered by the PGW or MME.

However, the bearer or session deletion procedure triggered by PGW or MME has the following problems.

The Reattach triggered by the PGW triggers the Reattach in a number of PGWs, which may increase the number of target systems and take a long time.

Referring to FIG. 2, when a subscriber is relocated to SGW_1, PGW Triggered Reattach operation must be performed in all PGWs (PGW_1 to PGW_n).

In addition, when a user terminal supporting Multiple PDN is accommodated, one user terminal must be accommodated in only one SGW according to the 3GPP standards. In this case, when two or more PGWs provide a service to one user terminal, If the deleted session (session 1) is restored after the PGW reattaches a specific subscriber session (session 1) and another PGW attempts to reattach the session (session 2), the SGW does not relocate the subscriber .

That is, as shown in FIG. 2, the UE 1 performs PGW Triggered Session Reactivation (Session 1) in PGW_1 while receiving services in PGW_1 (Session 1) and PGW_2 (Session 2) through SGW_1, 2), the session is re-created through SGW_1, so that even if session re-activation is performed in PGW_2, the subscriber is not relocated in SGW_1.

Reattach triggered by the MME must also be triggered by a number of MMEs, which can increase the number of systems to be operated and take a long time.

[0010]

It is an object of the present invention to provide a communication system and a control method thereof for maximizing efficiency of a subscriber relocation work, a recording medium on which a program for executing the control method is recorded, And to provide an application stored on the medium in combination with the hardware to execute the control method.

According to an aspect of the present invention, there is provided a communication system comprising: a Packet Data Network GateWay (PGW) corresponding to a gateway of a packet data network; An MME (Mobile Mobility Entity) that performs connection and release of the bearer to the user terminal; The first session deletion message corresponding to all the sessions is transmitted to the PGW in the case of the subscriber relocation status, and the first session deletion message corresponding to all the sessions is transmitted to the PGW, And an SGW (Serving GateWay) for transmitting a corresponding second session delete message to the MME.

In order to achieve the above object, the present invention provides a packet data network gateway (PGW) corresponding to a gateway of a packet data network according to the present invention, an SGW (Serving GateWay) existing between a communication path between the user terminal and the PGW, A method of controlling a communication system including an MME (Mobile Mobility Entity) that performs connection and release of a bearer to a user terminal, includes: determining whether the SGW is a subscriber relocation situation; The SGW transmits a first session delete message corresponding to all sessions to the PGW and a second session delete message corresponding to all sessions to the MME in the case of the subscriber relocation status .

INDUSTRIAL APPLICABILITY As described above, according to the present invention, when a subscriber relocation such as a system failure or an SGW software upgrade is required, the processing can be performed quickly, and the worker's work time can be shortened.

In addition, the conventional problem that a plurality of PGW sessions are not deleted at the same time for a multi-PDN terminal which is provided with service in two or more PGWs, the subscribers are not relocated. That is, the failure rate of the subscriber relocation can be significantly reduced.

1 is a schematic configuration diagram of a conventional communication system,
2 is a diagram illustrating a state in which one multi-PDN terminal is connected to a plurality of PGWs,
3 is a schematic configuration diagram of a communication system according to an embodiment of the present invention,
4 is a control flowchart of a communication system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in order to facilitate understanding of the present invention, and the present invention is not limited to these embodiments. In particular, the present invention can be configured by combining at least any one of individual components, individual functions, or individual steps included in each embodiment.

3, the communication system for Long Term Evolution (LTE) communication according to an embodiment of the present invention includes an eNodeB 400, a Mobility Management Entity (MME) 200, a Serving Gateway (SGW) , And a packet data network gateway (PGW) 300.

Here, the eNodeB 400 forms a communication channel between a user terminal 500 such as a mobile phone and a smart phone as a base station, and transmits / receives a signal.

The MME 200 is a node that handles a control plane in an EPC (Evolved Packet Core) corresponding to a core network structure in a 3GPP (3rd Generation Partnership Project) LTE network. The MME 200 performs connection and release of a bearer to and from an MS, State to an ACTIVE state, and performs security key management and the like.

In particular, in this embodiment, the MME 200 receives a second session deletion message from the SGW 100, generates a subscriber reconnection control signal according to the second session deletion message, and transmits the subscriber reconnection control signal to the user terminal 500 And when a reconnection request signal is received from the user terminal 500, a session is opened by selecting another SGW 100 other than the SGW 100 which transmitted the second session delete message.

The PGW 300 is a node connected to a packet-switching network such as the Internet in the EPC, that is, a node corresponding to a gateway of a packet data network, and performs allocation of an IP address to a specific terminal.

In particular, in this embodiment, the PGW 300 receives a first session delete message from the SGW 100 and deletes all sessions corresponding to the first session delete message, as described later.

The SGW 100 is a node that handles the user plane for the LTE RAN (Radio Access Network) in the EPC and exists between the communication path between the user terminal 500 and the PGW 300 and the user terminal 500 is connected to the eNodeB 400 ), Supports mobility between LTE and GSM / GPRS / HSPA, collects billing and statistical information, and so on.

In particular, in this embodiment, the SGW 100 determines whether it is a subscriber relocation situation. If it is determined that the subscriber is relocation status, the SGW 100 transmits a first session delete message corresponding to all sessions to the PGW 300, And transmits a corresponding second session delete message to the MME 200. [

Herein, the first session deletion message and the second session deletion message may be a single message or may refer to a series of transmission message groups.

The SGW 100 can determine whether or not the subscriber relocation status is based on self-detection of a functional failure, or can determine whether the subscriber relocation status is detected by detecting an administrator's command.

Here, the first session deletion message is the same message as the session deletion message defined as being generated (triggered) in the MME 200 in the 3GPP, and the second session deletion message is generated (triggered) in the PGP 300 in the 3GPP It may be the same message as the defined session delete message.

Meanwhile, the SGW 100 may store a default bearer EBI (EPS Bearer ID) corresponding to each session each time a new session is created. In the first session delete message and the second session delete message described above, EBI, < / RTI >

Also, the SGW 100 may include a reconnection control message for inducing reconnection of the user terminal 500 to the second session deletion message. According to the reconnection control message, the MME 200 can induce the user terminal 500 to be reconnected.

Hereinafter, a control flow of the communication system according to an embodiment of the present invention will be described with reference to FIG.

In the present embodiment, a plurality of MME 200, SGW 100 and PGW 300 may be provided. In FIG. 4, only a plurality of PGWs 300 (first PGW 310, second PGW 300, 320).

When a specific SGW 110 administrator has a system failure or needs to upgrade the SGW 110 software, a command for re-subscribing the subscriber is input. At this time, the SGW 110 storing and managing each session at present can be set by the SGW 110 administrator to be excluded from the relocation target.

When the subscriber relocation is required (step S1), the SGW 110 transmits to the PGWs 310 and 320 of each session all sessions managed by the SGW 110 the EBI of the Default Bearer (corresponding to a kind of unique identification number corresponding to each session) 1 session delete message (Delete Session Request) (step S3, step S5).

In addition, the SGW 110 transmits a second session delete message (Delete Bearer Request) including the EBI of the default bearer to the MME 200 for all the sessions being managed. At this time, the SGW 110 may set Reactivation Requested as a Cause value of the Delete Bearer Request so that the MME 200 may request the user terminal 500 to reactivate (Step S7, Step S9).

Each PGW 310 and 320 receiving the first session deletion message deletes the session and transmits a response message for the Delete Session Request to the SGW 110 (steps S11 and S13).

The MME 200 transmits a paging message for the subscriber reattach to the eNodeB 400 in step S15 and the user terminal 500 receiving the paging transmits the paging message to the MME 200 via the Service Req. Message (service request message) (step S17).

The MME 200 transmits a Detach Request message for relocation of the subscriber to the user terminal 500 (step S19). At this time, the MME 200 transmits the Detach Request message to the user terminal 500 in order to automatically re- You can send a Detach Request message containing -attach Required.

The user terminal 500 transmits a Detach Accept message to the MME 200 in response thereto (step S20).

Upon receipt of the Detach Accept message from the user terminal 500, the MME 200 deletes the Delete Bearer Resp. Message (step S21, step S23).

Then, the user terminal 500 performs a reattach procedure for accessing the network. The MME 200 notifies the SGW 110 that the SGW 110, which has previously transmitted the second session delete message, The SGW 120 is selected to establish a session.

Accordingly, the user terminal 500 performs communication via the new SGW 120 in place of the existing SGW 110.

That is, when the above-described process is performed, a session through the SGW 110 can be moved to the new SGW 120 when an error occurs in the existing SGW 110 or a software upgrade is required.

This is advantageous in that the number of operation target devices to be operated is reduced as compared with the conventional method described above with reference to FIGS. 1 and 2, and the operation time can be greatly reduced in the same manner.

Also, there is an effect of solving the problem that the SGW 100 subscriber relocation does not occur with respect to the multi-PDN terminal 500 that is served by two or more PGWs 310 and 320.

More specifically, when the MME 200 or the PGW 300 generates the first signal, that is, a trigger signal for causing the subscriber relocation to be performed as in the conventional case, a quick work process is not performed or, in some cases, May not be achieved at all.

For example, when there are a plurality of MMEs 200 and PGWs 300 connected to one SGW 100, a trigger signal for subscriber relocation is generated in all of the plurality of MMEs 200 and PGWs 300 The administrator or the person in charge should operate it.

For example, when 30 PGWs 300 are connected to one SGW 100, each of the 30 PGWs 300 must be manipulated to generate a trigger signal for subscriber relocation.

In contrast to this, according to the present invention, a trigger signal for subscribers relocation can be generated in one SGW 100 in which a session movement should be performed, so that a work process can be simplified and a work time can be shortened.

Assuming that one of the communication terminals is connected to the plurality of PGWs 310 and 320, a trigger signal for subscribers to be relocated is generated in any one PGW 300, i.e., the first PGW 310 The session connected to the first PGW 310 is deleted and the session connected to the second PGW 320 is deleted as the trigger signal for the subscriber relocation is generated in the other PGW 300, that is, the second PGW 320 , A session through the first PGW (301) is performed by the automatic recovery operation of the communication terminal during the time from the time when the session connected to the first PGW (310) is deleted until the time when the session connected with the second PGW (320) Can be regenerated, and if this process is repeated, the subscriber relocation can not be performed.

On the other hand, if the SGW 100 transmits a trigger signal for the subscriber relocation to the plurality of PGWs 310 and 320 as in the present invention, the conventional problem that subscriber relocation is not performed can be solved.

Meanwhile, it goes without saying that the process of performing each of the above-described embodiments can be performed by a program or an application stored in a predetermined recording medium (for example, a computer-readable). Here, the recording medium includes an electronic recording medium such as a RAM (Random Access Memory), a magnetic recording medium such as a hard disk, and an optical recording medium such as a CD (Compact Disk).

At this time, the program stored in the recording medium may be executed on hardware such as a computer or a smart phone to perform each of the above embodiments. In particular, at least one of the components of the communication system according to the present invention described above can be implemented by such a program or an application.

The present invention is not limited to the above-described specific embodiments, and various modifications and changes may be made without departing from the gist of the present invention. It is to be understood that such variations and modifications are intended to be included in the scope of the appended claims.

100: SGW 200: MME
300: PGW 400: eNodeB
500: User terminal

Claims (12)

A Packet Data Network GateWay (PGW) corresponding to a gateway of a packet data network, an SGW (Serving GateWay) existing between a communication path between the user terminal and the PGW, and an MME (Mobile Mobility Entity), the method comprising:
(a) determining whether the SGW is a subscriber relocation situation;
(b) if it is determined in step (a) that the subscriber is relocated, the SGW transmits a first session delete message corresponding to all sessions to the PGW, and a second session delete message corresponding to all sessions is transmitted to the MME To the base station. The method according to claim 1,
Wherein the first session delete message is the same message as the session delete message generated in the MME, and the second session delete message is the same message as the session delete message generated in the PGW. The method according to claim 1,
Storing the default Bearer ID (EBI) corresponding to each session whenever the SGW creates a new session,
Wherein the SGW includes both EBI corresponding to each session in the first session delete message and the second session delete message. The method according to claim 1,
Further comprising the step of the SGW including a reconnection control message for inducing reconnection of the user terminal to the second session deletion message. The method according to claim 1,
After the step (b)
The PGW deleting all sessions corresponding to the first session delete message;
The MME transmits a subscriber reconnection control signal to the user terminal according to the second session deletion message and, when receiving a reconnection request signal from the user terminal, selects an SGW other than the SGW that transmitted the second session deletion message Further comprising the step of: establishing a session with the communication system. A computer-readable recording medium storing a program for executing the method according to any one of claims 1 to 5.
An application program stored on a computer readable medium for executing the method of any one of claims 1 to 5 in combination with hardware. A Packet Data Network GateWay (PGW) corresponding to a gateway of the packet data network;
An MME (Mobile Mobility Entity) that performs connection and release of the bearer to the user terminal;
The first session deletion message corresponding to all the sessions is transmitted to the PGW in the case of the subscriber relocation status, and the first session deletion message corresponding to all the sessions is transmitted to the PGW, And a SGW (Serving GateWay) for transmitting a corresponding second session delete message to the MME. 9. The method of claim 8,
Wherein the first session delete message is the same message as the session delete message generated in the MME, and the second session delete message is the same message as the session delete message generated in the PGW. 9. The method of claim 8,
Each time a new session is created, the SGW stores a default Bearer ID (EBI) corresponding to each session, and the first session delete message and the second session delete message include both EBIs corresponding to each session To the communication system. 9. The method of claim 8,
Wherein the SGW includes a reconnection control message for inducing reconnection of the user terminal to the second session deletion message. 9. The method of claim 8,
The PGW deletes all sessions corresponding to the first session deletion message,
The MME transmits a subscriber reconnection control signal to the user terminal according to the second session deletion message and, when receiving a reconnection request signal from the user terminal, selects an SGW other than the SGW that transmitted the second session deletion message And establishing a session.

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