KR101601863B1 - Network apparatus and control method thereof - Google Patents

Abstract

In the communication environment in which a terminal uses a session-based communication service connected through a gateway device (S-GW), when a failure occurs in the S-GW, a session of a terminal connected through the failed S- A network device capable of avoiding a concern such as a failure of the policy management system (PCRF) by distributing the signaling of the P-GW occurring during the process, that is, the GBR bearer or the CCR-T and CCA- And a method of operating the network device.

Description

[0001] NETWORK APPARATUS AND CONTROL METHOD THEREOF [0002]

In the communication environment in which a terminal uses a session-based communication service connected through a gateway device (S-GW), when a failure occurs in the S-GW, a session of a terminal connected through the failed S- And to a technology field for avoiding a concern that may arise during the process.

Recently, the growth of LTE (Long Term Evolution) technology in domestic mobile communication has led to the evolution of LTE system in WCDMA system, which is a 3G service.

In the LTE system, a terminal can use various communication services such as a call service and a data service based on a session connected through a gateway device such as an S-GW (Serving Gateway) or a P-GW (Packet Data Network Gateway).

In this LTE system, when a failure occurs in the S-GW using the communication service, sessions of all terminals connected through the S-GW are disconnected, re-attach occurs, and the continuity of the communication service is guaranteed There was no problem.

Accordingly, a new corresponding function (hereinafter referred to as S-GW restoration function) has been proposed in order to ensure continuity of communication service even if a failure occurs in the S-GW in the 3GPP standard recently.

The S-GW restoration function refers to a call processing procedure in which the session of the terminal accommodated in the corresponding S-GW is handed over to another S-GW when the S-GW fails. At this time, the P-GW must maintain the session of the terminal connected through the failed S-GW until the session of the terminal is transferred to another S-GW.

In the P-GW, when the predetermined session holding time has elapsed, the session of the terminal which is kept connected through the fault occurrence S-GW is set to the session of the terminal so that the session of the terminal can be passed from the S- (CCR-T), and transmits a response message (Credit Control Answer-Termination, CCA-T) to the CCR- Thereby disconnecting the session of the terminal through the failure occurrence S-GW.

As described above, the signaling of the P-GW, that is, the CCR-T and the CCA-T for disconnecting the session of the terminal in the related art, There is a possibility that a simultaneous occurrence occurs, which may lead to a failure of the policy management system (PCRF).

Accordingly, the present invention proposes a method for avoiding a concern such as a failure of a policy management system (PCRF) that may occur during a process of disconnecting a session of a terminal connected through a failed S-GW.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to distribute signaling of a P-GW during a process of disconnecting a session of a terminal connected through a failed S- And a method of operating a network device and a network device capable of avoiding a concern such as a failure of a system (PCRF).

According to a first aspect of the present invention, there is provided a network device including: a session connection unit for connecting a session with each terminal through a gateway device; A detection unit for detecting whether or not a fault has occurred in the gateway device; And a controller for transmitting a connection release message for connection release with respect to the session of each terminal when the occurrence of the failure of the gateway device is detected, and distributing transmission time of the connection release message for each terminal.

Preferably, the control unit determines a transmission time point for each of the terminals based on the identifier of each terminal and a predetermined reference timer value, and transmits a connection release message for each terminal at a transmission time determined for each terminal have.

Advantageously, the identifier may be a different tunnel endpoint identifier (TEID) for each session and in-session bearer of the terminal.

Preferably, the control unit calculates a terminal timer value by adding a residual value obtained by adding a value according to an identifier of the terminal to a predetermined reference timer value for each terminal and dividing the value by a specific dispersion parameter, to the reference timer value, It is possible to determine, as the transmission time point, a time point at which the calculated terminal timer value elapses after the failure occurrence of the gateway apparatus is detected for each terminal.

Advantageously, the disconnect message may be a bearer disconnect message for disconnecting some of the bearers in the session, or a session disconnect message for disconnecting the session.

Preferably, the reference timer value includes a first reference timer value and a second reference timer value that is greater than the first reference timer value, and the controller determines whether the identifier of each terminal and the first reference timer value Determining a first transmission time point for each of the terminals based on the identifier of the terminal and transmitting a bearer connection release message of each terminal at a first transmission time point determined for each terminal, A second transmission time point may be determined for each terminal, and a session release message may be transmitted at a second transmission time point determined for each terminal.

According to a second aspect of the present invention, there is provided a method of operating a network device, the method comprising: connecting a session with each terminal through a gateway device; Detecting a failure of the gateway device; And a message transmission step of, when the occurrence of a failure of the gateway device is detected, transmitting a connection release message for connection release with respect to the session of each terminal, and distributing transmission time points of the connection release message for each of the terminals do.

Preferably, the message transmission step determines a transmission time point for each of the terminals based on the identifier of each terminal and a preset reference timer value, and transmits a connection release message for each terminal to a transmission point determined for each terminal Lt; / RTI >

Advantageously, the identifier may be a different tunnel endpoint identifier (TEID) for each session and in-session bearer.

Preferably, in the message transmission step, a terminal timer value is added to the reference timer value by adding a value according to the identifier of the terminal to a preset reference timer value for each terminal, , It is possible to determine, as the transmission time point, a time point at which the calculated terminal timer value elapses after the failure occurrence of the gateway apparatus is detected for each terminal.

According to the network device and the method of operating the network device according to the present invention, in a communication environment in which a terminal uses a session-based communication service connected through a gateway device (S-GW) By distributing the signaling of the P-GW during the process of disconnecting the session of the connected terminal through the S-GW, the effect of avoiding the concern such as the failure of the policy management system (PCRF) is derived.

1 is a configuration diagram illustrating a communication system including a network device according to a preferred embodiment of the present invention.
2 is a block diagram illustrating a configuration of a network device according to a preferred embodiment of the present invention.
3 is a control flow diagram of a communication system including a network device according to a preferred embodiment of the present invention.
4 is a flowchart illustrating an operation method of a network device according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating an environment of a communication system including a network device according to a preferred embodiment of the present invention.

1, a communication system according to a preferred embodiment of the present invention includes a plurality of terminals 1, 2, ..., N, a gateway device 10, a network device 100 of the present invention, , And a policy management system (PCRF) 20.

1, other nodes including a base station between the terminal and the gateway device 10 are not shown for convenience of explanation.

Here, it is preferable that the gateway device 10 is an S-GW (Serving Gateway), and the gateway device 10 and the S-GW 10 may be used in combination for convenience of explanation.

The network device 100 of the present invention may be a P-GW (Packet Data Network Gateway) or a device separate from the P-GW, and may implement all the functions described below through interoperation with the P-GW It would be possible.

Hereinafter, for convenience of explanation, the network device 100 of the present invention will be described with an example of a P-GW as an example, and the network device 100 and the P- can do.

1, one S-GW 10 and one P-GW 100 are connected to each other, but this is only an example, and the S-GW 10 is connected to a plurality of P-GWs Of course, the P-GW 100 can be connected to a plurality of S-GWs.

Hereinafter, for convenience of explanation, one S-GW 10 and one P-GW 100 will be described.

In the communication system shown in FIG. 1, a plurality of terminals 1, 2, ..., N are connected through the S-GW 10 and the network device 100, that is, the P- And may be connected to the external network 1 to use various communication services such as a call service and a data service.

The PCRF 20 is a system for providing policies and charging rules based on a service and a subscriber profile. The PCRF 20 is a system for providing policy and charging rules based on service and subscriber profile, And may be involved in disconnection.

At this time, in the S-GW 10, a failure may occur due to a device error or a communication environment error.

Hereinafter, it is assumed that a failure has occurred in the S-GW 10.

In the communication system, if a failure occurs in the S-GW 10, the sessions of all the terminals 1, 2, ..., N connected through the S-GW 10 are disconnected and re-attach ), The continuity of the communication service can not be guaranteed.

Accordingly, a new corresponding function (hereinafter referred to as S-GW restoration function) has been proposed in order to ensure the continuity of communication service even if a failure occurs in the S-GW 10 in the 3GPP standard.

The S-GW restoration function is a function of restoring the session of the terminals (1, 2, ..., N) accommodated in the S-GW 10 to another S-GW (not shown) The call processing procedure is referred to as a call processing procedure. At this time, until the session of the terminals 1, 2, ..., N is transferred to another S-GW (not shown), the P- , ... N).

Here, the specific procedure in which the sessions of the terminals 1, 2, ..., N accommodated in the S-GW 10 are transferred to another S-GW (not shown) Therefore, a detailed description thereof will be omitted.

At this time, in the case of the existing P-GW, when the predetermined session holding time has elapsed, the session of all the terminals (1, 2, ... N) connected and maintained through the S- (CCR-T) for the session of all the terminals (1, 2, ..., N) from the PCRF 20 at the same time by transmitting the request message (Credit Control Request-Termination (N-1) through the S-GW 10 at substantially the same time point by simultaneously receiving a response message (Credit Control Answer-Termination, CCA-T) And disconnected.

More specifically, in the case of the existing P-GW, when a predetermined first session holding time has elapsed, a session of all the terminals (1, 2, ..., N) connected through the S- The session is disconnected for all the terminals (1,2, ..., N) when a predetermined second session retention time has elapsed, and the connection release message (CCR-T-GBR Bearer) Message (CCR-T-APN) to the PCRF 20 simultaneously.

That is, the signaling of the P-GW for disconnecting the session of the terminal, that is, the CCR-T-GBR Bearer / APN and the CCA-T-GBR Bearer / APN, ..., N) at the same time in association with all of the terminals (1, 2, ..., N), which may cause a failure of the PCRF 20.

Therefore, in the present invention, the S-GW recovery function for passing a session of the terminal (1, 2, ... N) accommodated in the failed S-GW 10 to another S-GW (not shown) In connection with this, a method of effectively avoiding a concern that may occur during the process of disconnecting a session of a connected terminal (1, 2, ..., N) via a faulty S-GW 10 is proposed, (P-GW) 100, which realizes the P-GW 100. FIG.

Hereinafter, a network device according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

2, the network device 100 of the present invention includes a session connection unit 110 through which a session with each terminal is connected through a gateway device 10, A detection unit 120 for detecting a failure of the gateway device 10 and a connection release message for disconnecting the connection with respect to the session of each terminal when a failure of the gateway device 10 is detected, And a controller 130 for distributing and transmitting the data.

The session connection unit 110 can be connected to each terminal through the gateway apparatus 10, i.e., the S-GW 10, with a session with the terminals 1, 2, ..., N of FIG.

In other words, the session connection unit 110 is connected to the external network 1 through the S-GW 10 and the network device 100, that is, the P-GW 100, The session with the terminals 1, 2, ..., N can be connected through the S-GW 10 by performing various procedures for connecting (setting) the sessions.

Here, the procedure for connecting (setting) the session means a call processing procedure for establishing an existing session connection (setting), and a detailed description thereof will be omitted.

The detection unit 120 detects whether or not a fault has occurred in the gateway device 10, that is, the S-GW 10.

For example, nodes such as S-GW, P-GW, and MME (Mobile Management Entity) periodically transmit an Echo Request message to another node, and an Echo Response message is received , It can be detected that the node that has not received the echo reply message has failed.

In this way, the detection unit 120 can detect whether or not the S-GW 10 has failed by monitoring whether or not an echo response message corresponding to the echo request message is received from the S-GW 10.

Of course, the detection unit 120 can detect the occurrence of a failure of the S-GW 10 by adopting various existing methods in addition to the method using the above-described echo request / response message.

The control unit 130 detects a failure of the gateway apparatus 10, that is, the S-GW 10, as a result of the detection by the detection unit 120, And transmits a connection release message for releasing the connection release message to each of the terminals (1, 2, ..., N).

In other words, when a failure occurs in the S-GW 10, the session of the terminals (1, 2, ..., N) accommodated in the failure occurrence S-GW 10 by the S- To another S-GW (not shown).

In the P-GW 100 of the present invention, in particular, when the call processing procedure of the S-GW restoration function is being performed, ... N for each of the terminals (1, 2, ..., N) and transmits them to the PCRF (20).

More specifically, based on the identifiers of the terminals 1, 2, ..., N and the predetermined reference timer value, the control unit 130 sets the transmission time point for each terminal 1, 2 ... N And transmits a connection release message of each terminal 1, 2 ... N to the PCRF 20 at a transmission point determined for each terminal 1, 2 ... N, have.

Here, the connection release message transmitted to the PCRF 20 may be a bearer connection release message for disconnecting some bearers in the session, or a session connection release message for disconnecting a session. At this time, a part of the bearer means a GBR bearer to be described later.

The reference timer value may include a first reference timer value and a second reference timer value that is greater than the first reference timer value.

In this case, for example, the first reference timer value may be a count value of the first session holding time mentioned in the description of the existing P-GW, and the second reference timer value may be a value May be a count value of the second session holding time.

The identifier is preferably a different tunnel endpoint identifier (TEID) for each session and an in-session bearer of the terminal.

Explaining the terminal 1 among the terminals 1, 2 ... N, a general call processing for connecting (setting) the session of the terminal 1 through the S-GW 10 and the P- According to the procedure, a basic bearer (Non-Guaranteed Bit Rate) is set as a basic non-guaranteed bit rate (GBR), and then a Dedicated Bearer ) Is set. At this time, the dedicated bearer may be a guaranteed bit rate (GBR) or a non-GBR.

Therefore, the session of the terminal 1 may include only a basic bearer which is non-GBR, or at least one dedicated bearer which is a non-GBR basic and non-GBR or GBR.

That is, the basic bearer is not a GBR bearer, and the dedicated bearer may or may not be a GBR bearer.

Meanwhile, in the process of connecting (setting) the session of the terminal 1 through the S-GW 10 and the P-GW 100, the P-GW 100 transmits a TEID (Hereinafter referred to as a session TEID), and manages a TEID (hereinafter, referred to as bearer TEID) as an identifier capable of identifying each bearer included in the session of the terminal 1.

As a result, in the process of connecting (establishing) the session of each terminal 1, 2 ... N through the S-GW 10 and the P-GW 100, the P- 1,..., N) manage different session TEIDs and manage different bearer TEIDs for each bearer in a session of each of the terminals (1, 2 ... N). ... N) and the bearer TEID for each bearer of each terminal (1, 2, ..., N).

To be more specific, the control unit 130 controls the first terminal 1, the second terminal 2, ... N based on the identifiers of the terminals 1, 2, ..., N and the first reference timer value, And transmits a bearer connection release message of each terminal 1,2 ... N to the PCRF 20 at a first transmission time determined for each of the terminals 1,2.

The control unit 130 determines a second transmission time point for each of the terminals 1, 2 ... N based on the identifiers of the terminals 1, 2, ..., N and the second reference timer value, N may transmit the session unblocking message to the PCRF 20 at a second transmission time determined for each of the terminals 1, 2, ..., N.

Hereinafter, a process of determining the first transmission time and the second transmission time by referring to the terminal 1 among the terminals 1, 2, ..., N will be described in more detail.

At this time, it is assumed that a session of the terminal 1 has a GBR bearer (e.g., dedicated bearer of GBR) set therein.

In this case, based on the identifier of the terminal 1, that is, the bearer TEID and the first reference timer value for the GBR bearer in the session of the terminal 1 (for example, dedicated bearer of GBR) and the first reference timer value, .

For example, the control unit 130 adds the value of the bearer TEID (e.g., A) to the GBR bearer of the terminal 1 (e.g., GBR dedicated bearer) to the first reference timer value (e.g., X) The first terminal timer value of the terminal 1 can be calculated by adding the remaining value divided by the parameter (e.g., N) to the first reference timer value (e.g., X). This can be expressed by the following equation (1).

Equation 1.

The first terminal timer value = mod [(the first reference timer value (e.g. X) + the value of the bearer TEID (e.g. A) / N] + the first reference timer value (e.g. X)

The control unit 130 determines the time point at which the first terminal timer value calculated for the terminal 1 has elapsed after the occurrence of the failure of the S-GW 10 at the detection unit 110 described above, It can be determined as a time point.

In addition, the control unit 130 determines the second transmission time point of the terminal 1 based on the identifier of the terminal 1, that is, the session TEID for the session of the terminal 1 and the second reference timer value.

For example, the control unit 130 adds the value of the session TEID for the session of the terminal 1 (e.g., B) to the second reference timer value (e.g., Y) May be added to a second reference timer value (e.g., Y) to calculate a second terminal timer value of the terminal 1. This can be expressed by the following equation (2).

Equation 2.

(E.g. Y) + the value of the session TEID (e.g., B) / N] + the second reference timer value (e.g., Y)

The control unit 130 determines the time point at which the second terminal timer value calculated for the terminal 1 has elapsed after the detection of the failure of the S-GW 10 by the detection unit 110 described above, It can be determined as a time point.

As described above, the control unit 130 transmits a first transmission point-in-time (CCR-T-GBR Bearer) message to the PCRF 20 in order to transmit a bearer connection release message (CCR-T-APN) for the connection release request of the PCRF 20 to the PCRF 20.

Unless the GBR bearer (for example, a GBR dedicated bearer) is set in the session of the terminal 1, unlike the above-mentioned premise that the session of the terminal 1 is set to the GBR bearer (for example, dedicated bearer for GBR) The control unit 130 may omit the procedure for determining the first transmission time described above with respect to the session of the terminal 1. [

The control unit 130 transmits the first transmission time point and the second transmission time point to each terminal 1 and 2 including the terminal 1 connected through the failure S-GW 10 in the same manner as described above Respectively.

After detecting the failure occurrence of the S-GW 10, the controller 130 transmits a CCR-T-GBR Bearer message of each terminal 1,2? To each terminal 1,2? And transmits the CCR-T-GBR Bearer message to the PCRF 20 at the first transmission time.

At this time, the controller 130 deletes the corresponding GBR bearer information stored in the P-GW 100 while transmitting a bearer release message (CCR-T-GBR Bearer) for each of the terminals 1 and 2, (CCR-T-GBR Bearer) can be dispersed and transmitted at the same time as the related GBR bearer information can be dispersed and deleted.

After detecting the occurrence of the failure of the S-GW 10, the control unit 130 transmits a session release message (CCR-T-APN) of each terminal 1,2 to each terminal 1? And transmits the session release message (CCR-T-APN) to the PCRF 20 at the determined second transmission time.

At this time, the controller 130 deletes the corresponding APN information stored in the P-GW 100 while transmitting a session release message (CCR-T-APN) for each of the terminals 1 and 2, (CCR-T-APN) can be distributed and transmitted at the same time as related APN information can be dispersed and deleted.

As described above, the network device 100 according to the present invention is a network device in which, in a communication environment using a session-based communication service in which a terminal is connected through a gateway device (S-GW) GW signaling, that is, the CCR-T-GBR Bearer / APN and the CCA-T-GBR Bearer / APN are distributed during the process of disconnecting the session of the terminal connected through the GW, And the like can be avoided.

Meanwhile, in the above description, in the present invention, a different TEID is used as an identifier used for determining a transmission time point of each terminal, for each session and an in-session bearer of the terminal. However, in the present invention, a terminal identifier (e.g., IMSI) unique to the terminal may be used as the identifier.

However, in the present invention, it is more effective to use TEID than to use a terminal identifier (e.g., IMSI) as an identifier in terms of signaling distribution of P-GW.

This is because a situation in which one same terminal connects several different sessions through one S-GW 10 and several different P-GWs should be considered.

Assuming the occurrence of a failure of the S-GW 10 in the above-mentioned situation, when a terminal identifier (for example, IMSI) is used as an identifier, each of the plurality of P-GWs is independently controlled according to the above- However, the policy management system (PCRF) side always receives signaling from the respective P-GWs for the same terminal at the same time, and determines the transmission time (e.g., first and second transmission time) of each terminal by generating signaling / ≪ / RTI > As a result, although the signaling distribution effect of the P-GW can be obtained as compared with the conventional method, the effect thereof is small compared with the case of using the TEID as the identifier. This is because a plurality of P-GWs use the same terminal identifier (e.g., IMSI) to determine the transmission time point for the same terminal.

Therefore, in the present invention, it is more preferable to use a different TEID for each session and an in-session bearer as an identifier used for determining a transmission time point of each terminal.

Hereinafter, an operation method of a network device according to a preferred embodiment of the present invention will be described with reference to FIG. 3 to FIG. For convenience of description, description will be given with reference to Figs. 1 and 2 described above.

First, with reference to FIG. 3, a control flow of a communication system including a network device according to the present invention will be described.

The terminals are connected to the external network 1 through the S-GW 10 and the network device 100, that is, the P-GW 100, The session on which it is based is connected (set).

N is connected to the external network 1 based on a session connected through the S-GW 10 and the P-GW 100, A variety of communication services such as data service can be used.

At this time, if a failure occurs in the S-GW 10 (S10), the P-GW 100 can detect occurrence of a failure of the S-GW 10.

For example, the P-GW 100 periodically transmits an echo request to the S-GW 10 and determines whether an echo response corresponding thereto is received from the S-GW 10 , It is possible to detect whether the S-GW 10 has failed (S20, S25).

The P-GW 100 detects a failure occurrence (S30) if an echo response is not received from the S-GW 10 And transmits a connection release message for releasing the connection to the PCRF 20 and distributes the transmission time of the connection release message for each of the terminals 1, 2.

For example, if a session release message (CCR-T-APN) for disconnecting a session of a terminal is described, the P-GW 100 transmits, to each terminal (1,2 ... N) (For example, Y) by adding the value of the session TEID for the session of the terminal to the reference timer value (e.g., Y) of the terminal and adding the remaining value obtained by dividing the value by the specific dispersion parameter (e.g., N) The second terminal timer value may be calculated (S40). The calculated second terminal timer values of the terminals 1, 2 ... N are Timer1, 2, ..., N, respectively.

In step S30, the P-GW 100 determines whether or not the S-GW 10 (N-1) has been received in accordance with the second terminal timer value calculated for each terminal 1, (CCR-T-APN) is distributed to each of the terminals (1, 2, ..., N) after the occurrence of the failure of the first terminal timer value (S50, S60 ... S70).

Hereinafter, a method of operating a network device according to a preferred embodiment of the present invention will be described in detail with reference to FIG. For convenience of explanation, the network device of the present invention will be described as being a P-GW.

In this case, for convenience of explanation, until the session of each terminal (1, 2, ..., N) is disconnected in the state where the failure has not been restored after the occurrence of the failure in the S-GW 10 .

A method of operation of the network device according to the present invention, for example, the P-GW 100, can be connected to each terminal through the S-GW 10 with a session with the terminals 1, 2, ..., S100).

In other words, the method of operating the P-GW 100 according to the present invention is based on the fact that the terminal is connected to the external network 1 through the S-GW 10 and the P-GW 100 and uses various communication services The session with the terminals 1, 2..., N can be connected through the S-GW 10 by performing various procedures for connecting (establishing) the session.

The operation method of the P-GW 100 according to the present invention detects whether the S-GW 10 has failed or not (S110).

The operation method of the P-GW 100 according to the present invention is such that if a failure occurrence of the S-GW 10 is detected (S110 Yes), the operation method of the P- (S120). ≪ / RTI >

Specifically, the method of operation of the P-GW 100 according to the present invention is a method for identifying a session of each terminal (1, 2, ..., N) Different bearer TEIDs can be identified for different session TEIDs and for each bearer in the session of each terminal (1, 2 ... N).

The method of operation of the P-GW 100 according to the present invention is a method of connecting (establishing) a session of each terminal 1,2 ... N through the S-GW 10 and the P- N manages different session TEIDs for each session and manages different bearer TEIDs for each bearer in the session of each terminal 1, 2 ... N, It is possible to confirm the session TEID of each of the terminals 1, 2 ... N and the bearer TEID of each terminal 1, 2, ..., N by each bearer.

The operation method of the P-GW 100 according to the present invention determines a first transmission time for each of the terminals 1, 2 ... N, 2 transmission time (S130).

Hereinafter, a process of determining the first transmission time and the second transmission time by referring to the terminal 1 among the terminals 1, 2, ..., N will be described in more detail. At this time, it is assumed that a session of the terminal 1 has a GBR bearer (e.g., dedicated bearer of GBR) set therein.

The method of operation of the P-GW 100 according to the present invention is based on the identifier of the terminal 1, that is, the bearer TEID and the first reference timer value for the GBR bearer in the session of the terminal 1 Lt; RTI ID = 0.0 > 1 < / RTI >

For example, the method of operation of the P-GW 100 in accordance with the present invention is based on a method in which the value of the bearer TEID for the GBR bearer (e.g., GBR dedicated bearer) of the terminal 1 is set to a first reference timer value The first terminal timer value of the terminal 1 can be calculated by adding the residual value divided by the specific dispersion parameter (e.g., N) to the first reference timer value (e.g., X) This can be expressed by Equation 1 described above.

The operation method of the P-GW 100 according to the present invention is such that after the occurrence of a failure in the S-GW 10 in step S110 described above, a time point at which the first terminal timer value calculated for the terminal 1 lapses It can be determined as the first transmission time of the terminal 1. [

The method of operation of the P-GW 100 according to the present invention determines the second transmission time point of the terminal 1 based on the identifier of the terminal 1, that is, the session TEID and the second reference timer value for the session of the terminal 1 .

For example, the method of operation of the P-GW 100 according to the present invention may include adding a session TEID value (e.g., B) for the session of the terminal 1 to a second reference timer value (e.g., Y) The second terminal timer value of the terminal 1 can be calculated by adding the remaining value divided by the parameter (e.g., N) to the second reference timer value (e.g., Y). This can be expressed by Equation 2 described above.

The operation method of the P-GW 100 according to the present invention is such that the time point at which the second terminal timer value calculated for the terminal 1 lapses after the detection of the failure occurrence of the S-GW 10 in the above- It can be determined as the second transmission time point of the terminal 1.

As described above, the method of operating the P-GW 100 according to the present invention is a method in which a CCR-T-GBR Bearer for requesting connection release of a GBR bearer is transmitted to the PCRF 20 (CCR-T-APN) for requesting the connection release of the session to the PCRF 20, as shown in FIG.

The method of operation of the P-GW 100 according to the present invention is the same as the above-described method of operating the P-GW 100 for each terminal 1, 2 including the terminal 1 connected through the failed S- 1 transmission time and the second transmission time, respectively.

The operation method of the P-GW 100 according to the present invention is a method of operating the P-GW 100 in such a manner that after the failure occurrence of the S-GW 10 is detected in step S110, T-GBR Bearer) to the PCRF 20 at a first transmission time determined for each of the terminals 1 and 2 (S140).

In this case, the method of operating the P-GW 100 according to the present invention is performed by transmitting a bearer connection release message (CCR-T-GBR Bearer) By deleting the corresponding GBR bearer information, the bearer release message (CCR-T-GBR Bearer) is distributedly transmitted for each of the terminals 1 and 2, and related GBR bearer information can also be distributedly deleted.

The method of operation of the P-GW 100 according to the present invention may further include detecting a failure occurrence of the S-GW 10 in step S110, (CCR-T-APN) to the PCRF 20 at the second transmission time determined for each of the terminals 1 and 2 (S150).

The method of operation of the P-GW 100 according to the present invention is a method of transmitting a session release message (CCR-T-APN) for each terminal 1,2, APN information is deleted, and the session release message (CCR-T-APN) is distributedly transmitted for each of the terminals 1 and 2, and related APN information can also be distributedly deleted.

As described above, the operating method of the network device according to the present invention is characterized in that, in a communication environment using a session-based communication service in which a terminal is connected through a gateway device (S-GW) GW signaling, that is, the CCR-T-GBR Bearer / APN and the CCA-T-GBR Bearer / APN are distributed during the process of disconnecting the session of the terminal connected through the GW, And the like can be avoided.

A method of operating a network device according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the network device and the operation method of the network device according to the present invention, when the failure of the S-GW occurs, the signaling of the P-GW is distributed during the process of disconnecting the session of the terminal connected through the failed S- (PCRF), it is possible to use a device not only for the related technology but also for the commercialization or operation of the device. This is an invention that is industrially applicable because it can be practically done.

1: External network
10: Gateway device (S-GW)
20: PCRF
100: Network device (P-GW)

Claims (10)

A session connection unit for connecting a session with each terminal through a gateway device;
A detection unit for detecting whether or not a fault has occurred in the gateway device; And
And a controller for transmitting a connection release message for connection release in connection with the session of each terminal when a failure of the gateway device is detected,
Wherein,
Determines a transmission time point of the connection release message for each of the terminals so that transmission of the connection release message of each terminal is dispersed, and transmits a connection release message for each terminal at a transmission time determined for each terminal. The method according to claim 1,
Wherein,
Determines a transmission time point for each terminal based on the identifier of each terminal and a predetermined reference timer value, and transmits a connection release message for each terminal at a transmission time determined for each terminal. 3. The method of claim 2,
Wherein the identifier comprises:
Wherein the tunnel identifier is a different tunnel endpoint identifier (TEID) for each session and an in-session bearer of the terminal. 3. The method of claim 2,
Wherein,
A terminal timer value is added to the reference timer value by adding a value according to the identifier of the terminal to a predetermined reference timer value and dividing the value by a specific dispersion parameter for each terminal,
And determines a time point at which the calculated terminal timer value elapses after detecting the occurrence of a failure of the gateway apparatus as the transmission time point for each of the terminals. 3. The method of claim 2,
The disconnection message includes:
A bearer disconnect message for disconnecting a part of bearers in the session, or a session disconnect message for disconnecting the session. 6. The method of claim 5,
Wherein the reference timer value includes a first reference timer value and a second reference timer value that is greater than the first reference timer value,
Wherein,
Determining a first transmission time point for each terminal based on the identifier of each terminal and the first reference timer value and transmitting a bearer connection release message of each terminal at a first transmission time point determined for each terminal,
Determining a second transmission time point for each terminal based on the identifier of each terminal and the second reference timer value and transmitting a session connection release message of each terminal at a second transmission time point determined for each terminal Characterized by a network device. A session connection step of connecting a session with each terminal through a gateway device;
Detecting a failure of the gateway device; And
And a message transmission step of, when a failure occurrence in the gateway apparatus is detected, transmitting a connection release message for disconnecting in connection with the session of each terminal,
The control unit,
Determining a transmission time point of a connection release message for each of the terminals so that transmission of a connection release message of each terminal is dispersed and transmitting a connection release message for each terminal at a transmission time determined for each terminal; How it works. 8. The method of claim 7,
Wherein the message transmission step comprises:
Determining a transmission time point for each terminal based on an identifier of each terminal and a preset reference timer value and transmitting a connection release message for each terminal at a transmission time point determined for each terminal, Way. 9. The method of claim 8,
Wherein the identifier comprises:
And a tunnel endpoint identifier (TEID) for each session and session bearer. 9. The method of claim 8,
Wherein the message transmission step comprises:
A terminal timer value is added to the reference timer value by adding a value according to the identifier of the terminal to a predetermined reference timer value and dividing the value by a specific dispersion parameter for each terminal,
Wherein the time point at which the calculated terminal timer value elapses after detecting the occurrence of a failure of the gateway apparatus is determined as the transmission time point for each of the terminals.

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