KR102055699B1 - Base station apparatus and control method thereof - Google Patents

Abstract

The present invention, by varying the restriction on the call session according to what kind of communication service the call session is set for the terminal in the base station under the overload state, it is required to ensure a high quality of service at the base station side The present invention discloses a base station apparatus and a method of operating the base station apparatus capable of efficiently adjusting a load of a base station while providing a service normally.

Description

BASE STATION APPARATUS AND CONTROL METHOD THEREOF

The present invention relates to a base station apparatus and a method of operating the base station apparatus, and more particularly, according to the call session for the type of communication service that the call session is set for the terminal in the base station under overload By differently restricting, the present invention relates to a base station apparatus and a method of operating the base station apparatus capable of efficiently adjusting the load of the base station while allowing a normal service to be provided for a communication service requiring high quality of service on the base station side.

Recently, domestic mobile communication is moving from 3G service WCDMA to LTE network due to the growth of LTE (Long Term Evolution) network, and with the introduction of a terminal (LTE terminal) that can use data service by connecting to LTE network This is accelerating.

Recently, VoLTE service supporting voice service using LTE network has emerged. The VoLTE service is a VoIP service using an LTE network, and can provide an excellent sound quality compared to a voice service using a conventional circuit network. Here, since VoLTE service is a voice service, since real-time is most important, a service quality of a higher level than a general data service should be guaranteed.

On the other hand, in a mobile communication system, in order to minimize the impact on the system when the call is congested, by limiting the call to prevent the phenomenon of overload and system down.

In this regard, in the WCDMA system, a call can be restricted to each of a CS (Circuit Service) and a PS (Packet Service), but in an LTE system, a call (data call) for a general data service and a call for a VoLTE service ( Since all VoLTE calls are based on the PS scheme, it is difficult to distinguish between the data call and the VoLTE call, which makes it difficult to restrict the calls individually.

Thus, when an overload condition occurs because a terminal using a VoLTE service and a terminal using a general data service are gathered in the LTE base station, since the call is restricted in the same limited manner without distinguishing between a data call and a VoLTE call, a high service is provided. The VoLTE service requiring quality guarantee may not be normally serviced.

Accordingly, the present invention is to propose a method that can limit the call in a different restriction scheme for each data call and VoLTE call in the LTE base station under overload.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reach a corresponding call session depending on what kind of communication session a call session is set for a terminal in an overloaded base station. The present invention provides a base station apparatus and a method of operating the base station apparatus that can adjust the load of the base station efficiently while providing a service normally for a communication service requiring high quality of service at the base station by differently restricting the limitations. .

A base station apparatus according to a first aspect of the present invention for achieving the above object comprises: a call session setting unit for setting a call session for a packet network-based communication service for a terminal; A communication service checking unit for checking a type of the communication service based on a call session set for the terminal when the load of the base station apparatus is overloaded; And a call session controller configured to maintain a call session set for the terminal or to release a call session set for the terminal according to the identified communication service type.

Preferably, when the type of the communication service is a first communication service requiring a service quality guarantee of a certain level or higher, the communication service is provided to the terminal through the call session by maintaining a call session set for the terminal. And, if the type of communication service is a second communication service that does not require a service quality guarantee of a certain level or more, the call session set for the terminal may be released to adjust the load of the base station apparatus.

Preferably, the communication service confirming unit, if the call session setting unit additionally sets a specific call session after setting a basic call session for the terminal may determine that the communication service is the first communication service. .

Preferably, the communication service confirming unit, when the call session setting unit receives a call session setting request for setting up a specific call session after setting a basic call session for the terminal, the call session setting request. If the quality level identifier associated with the service quality above the specific level is confirmed from, it can be confirmed that the communication service is the first communication service.

Preferably, the communication service confirming unit, when the call session setting unit establishes only a basic call session for the terminal, it may be confirmed that the communication service is the second communication service.

Preferably, the call session controller, after releasing the call session set for the terminal, may limit the call session set up for the terminal according to a predefined call session setting restriction policy.

A method of operating a base station apparatus according to a second aspect of the present invention for achieving the above object comprises: a call session setting step of establishing a call session for a packet network based communication service for a terminal; A communication service checking step of confirming a type of the communication service based on a call session set for the terminal when the load of the base station apparatus is overloaded; And a call session control step of maintaining a call session set for the terminal or releasing a call session set for the terminal according to the identified type of communication service.

Preferably, in the call session control step, when the type of the communication service is a first communication service requiring a service quality guarantee of a certain level or more, the call session is maintained to the terminal by maintaining a call session set for the terminal. If the communication service is provided, and if the type of the communication service is a second communication service that does not require the service quality guarantee of the specified level or higher, the call session set for the terminal is released to adjust the load of the base station apparatus. You can do that.

Preferably, the communication service confirming step, if a specific call session is additionally set after establishing a basic call session for the terminal in the call session setting step, it can be confirmed that the communication service is the first communication service. have.

Preferably, the communication service confirmation step, when the call session setting step receives a call session setup request requesting to establish a specific call session after setting a basic call session for the terminal, the call session setup When the quality level identifier associated with the service quality of the specific level or more is confirmed from the request, it may be confirmed that the communication service is the first communication service.

Preferably, in the communication service confirmation step, when only the basic call session is set for the terminal in the call session setting step, it may be confirmed that the communication service is the second communication service.

Preferably, the method may further include, after releasing the call session set up for the terminal, limiting call session setup for the terminal according to a predefined call session setup restriction policy.

Accordingly, according to the operation method of the base station apparatus and the base station apparatus of the present invention, the call session is first allowed to be established for the terminal even under an overload state, and what kind of communication service the terminal intends to use on the basis of the call session thus set up. By checking and restricting call sessions according to the type of communication service, it is possible to efficiently service the load of the base station while providing normal service for communication services (eg VoLTE service) requiring high quality of service. Can adjust the effect.

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

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

1 is a diagram illustrating a communication system including a base station apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, the communication system may include a terminal 10, a packet network 1, and a base station apparatus 100 according to the present invention.

Here, the packet network 1 is a network for providing a communication service based on a packet (PS: Packet Switched), for example, preferably includes an LTE network. Here, the communication service provided by the packet network 1 includes a call service for transmitting / receiving a VoLTE call supporting a voice call, for example, a VoLTE service, a video service for transmitting / receiving a video call, a data service for transmitting / receiving a general data call, and the like. can do.

Hereinafter, for convenience of description, it will be described with reference to VoLTE service and data service as a communication service.

The terminal 10 is a terminal that can connect to the packet network 1 and use at least one of a communication service provided by the packet network 1, that is, a VoLTE service and a data service.

That is, the terminal 10 may access the packet network 1 through the base station apparatus 100 to make a call using a VoLTE service with a counterpart terminal (not shown), and the packet network 1 through the base station apparatus 100. Can be used to access data services from a data server (not shown).

When the terminal 10 is connected to the packet network 1, the packet network between the terminal 10 and the packet network 1 through interworking with the base station apparatus 100 and other equipment (eg, S-GW, P-GW, etc.) (1) A call session (eg EPS Bearer) for a base communication service is created / configured.

The base station apparatus 100 enables the terminal 10 connected thereto to use the packet network 1 based communication service through a call session by accessing the packet network 1.

That is, the base station apparatus 100 is located on a call session created for connection between the terminal 10 and the packet network 1, and the terminal 10 and the packet network 1 when the terminal 10 uses VoLTE service. A VoLTE call may be transmitted and received between the terminals, and when the terminal 10 uses a data service, it may transmit and receive a data call between the terminal 1 and the packet network 1.

The base station apparatus 100 is based on the number of terminals 10 connected to the base station apparatus 100 or the traffic load of the call generated by the connected terminal 10 or the CPU load state in the base station apparatus 100. If it is determined that the load of 100) is in an overload state, in order to improve the current overload state, a call session establishment restriction policy for restricting the establishment of a call session may be applied to the terminal 10.

However, since VoLTE service is most important in real time, the service quality of the VoLTE service should be guaranteed higher than general data service. Therefore, the VoLTE service can normally use VoLTE service without limiting call session setup. You need to do it.

To this end, the base station apparatus 100 must check the type of communication service used by the terminal 10. Since both the VoLTE call and the data call are based on the PS scheme, a call (VoLTE call or data transmitted and received from the base station apparatus 100) is required. It is difficult to distinguish between what kind of communication service, for example, VoLTE service or data service, used by the terminal 10 through call).

Accordingly, the base station apparatus 100 according to the present invention first allows a call session to be established between the terminal 10 and the packet network 1 even under an overload condition. By confirming whether or not to use a communication service, the present invention proposes a method that can apply different restrictions on call sessions according to the type of communication service.

In more detail, the base station apparatus 100 according to the present invention sets up a call session for a communication service based on the packet network 1 for the terminal 10.

That is, the base station apparatus 100 sets up a call session for requesting to establish a call session for the terminal 10 from the packet network 1 when a packet network connection event requiring the packet network 1 connection to the terminal 10 occurs. You will receive a request (eg, Activate Default Bearer Request Message).

Accordingly, the base station apparatus 100 transmits a call establishment request (eg, an activated default bearer request message) received from the packet network 1 to the terminal 10, and thus the terminal 10, the base station apparatus 100, and the like. By interworking with the equipment (eg, S-GW, P-GW, etc.), a call session between the terminal 10 and the packet network 1, that is, a basic call session (eg, a default bearer) may be established.

In this case, the packet network access event may be performed when a call origination using the VoLTE service from the terminal 10 to the other terminal (not shown) is attempted, or a call origination using the VoLTE service from the other terminal (not shown) to the terminal 10 is performed. The case may be attempted, or the terminal 10 attempts to access the video service, or the terminal 10 attempts to access the data service.

At this time, when the packet network connection event generated for the terminal 10 is associated with a call or video service using the VoLTE service, the base station apparatus 100 further performs a specific call session from the packet network 1 to the terminal 10. You will also receive a call establishment request (eg, an Activate Dedicated Bearer Request Message) requesting to set up a. Hereinafter, for convenience of description, it will be described with reference to the VoLTE service.

Accordingly, the base station apparatus 100 transmits a call establishment request (eg, Activate Dedicated Bearer Request Message) received from the packet network 1 to the terminal 10, thereby transmitting the terminal 10, the base station apparatus 100, and the like. By interworking with the equipment (eg, S-GW, P-GW, etc.), a call session between the terminal 10 and the packet network 1, that is, an additional specific call session (eg, a dedicated bearer) may be established.

In this way, the base station apparatus 100, regardless of whether or not the load of the base station apparatus 100 is overloaded, call session for the communication service based on the packet network 1, that is, basic call session (for example) for the terminal 10 : Default Bearer or default call session (eg Default Bearer) and specific call session (eg Dedicated Bearer) can be set.

After the call session is established for the terminal 10 as described above, the base station apparatus 100 based on the call session set for the terminal 10 if the load of the base station apparatus 100 is overloaded. Check the type of communication service to be used in the terminal 10.

Accordingly, the base station apparatus 100 maintains the call session set up for the terminal 10 according to the identified communication service type so that the communication service is provided to the terminal 10 through the call session or the terminal 10. The load of the base station apparatus 100 is adjusted by releasing the call session set with respect to FIG.

For example, the base station apparatus 100 maintains the call session set for the terminal 10 when the identified communication service type is a first communication service, that is, VoLTE service, which requires a service quality guarantee of a certain level or more. Call session) to provide VoLTE services. That is, even when the base station apparatus 100 is overloaded, the base station apparatus 100 does not apply the restriction on the call session by maintaining the set call session for the terminal 10 to use the VoLTE service.

When the VoLTE service is terminated in the terminal 10, the base station apparatus 100 may release the call session set for the terminal 10.

On the other hand, the base station apparatus 100 releases the call session set up for the terminal 10 when the identified communication service is a second communication service, i.e., a data service, which does not require a service level guarantee of a certain level or higher. That is, the base station apparatus 100 applies a restriction on the call session by releasing the set call session with respect to the terminal 10 to use the data service in the case of an overload condition.

Then, the base station apparatus 100, after the release of the call session as described above with respect to the terminal 10 to apply the restriction on the call session, it is possible to apply a predefined call session setting restriction policy.

Here, the predefined session establishment restriction policy may be a policy for probabilistically blocking call session establishment, and in the following, the base station apparatus 100 applies the session establishment restriction policy to the terminal 10 in detail. Explained as follows.

After the base station apparatus 100 releases the call session set up for the terminal 10 as described above, the base station apparatus 100 provides the call setup restriction information according to the call setup restriction policy to the terminal 10. For example, the system information block 2 (SIB2) among the system information provided to the terminals located in the coverage thereof may be provided by including the call setting restriction information according to the call setting restriction policy.

Here, the session setup restriction information may include restriction target information (ac-BarringFactor) and timeout information (ac-BarringTime).

Accordingly, as described above, the terminal 10 in which the call session previously set by the base station apparatus 100 is released will selectively attempt to connect to the packet network 1 based on the received call session setting restriction information.

For example, the terminal 10 generates a random value between 0 and 1, and attempts to connect to the packet network 1 when a value lower than the restriction target information (eg, 0.6) of the call setup restriction information is generated. As described above, a call session with the packet network 1 will be established.

On the other hand, the terminal 10 generates a random value between 0 and 1, and if a value is higher than the restriction target information (eg, 0.6) of the session setting restriction information, the terminal 10 does not attempt to connect to the packet network 1 without restriction. After waiting for the time information (eg 4 seconds), re-generate a random value and check again whether it is later than the restriction target information (eg 0.6).

As such, when the base station apparatus 100 applies the call establishment restriction policy, about 40% of the terminals that are located in the coverage of the base station apparatus 100 and receive the call establishment restriction information, that is, the restriction target information ( Example: Since the connection to the packet network 1 can be restricted for a terminal having a random value higher than 0.6), a result of adjusting the load of the base station apparatus 100 to be lowered can be obtained.

Here, the restriction target information and the time limit information may be set differently according to the load state of the base station apparatus 100. For example, the overload state of the base station apparatus 100 may be classified into Critical, Major, and Minor (eg, Critical = CPU load state 90%, Major = CPU load state 80%, Minor = CPU load state 70%). In the case of an overload state, the restriction target information may be set low to limit the access of the terminal as much as possible, and in the case of the minor overload state, the restriction target information may be set high in order to allow relatively large access of the terminal.

Accordingly, the base station apparatus 100 operates on the basis of the call setting restriction information according to the call setting restriction policy and sets up a call session with respect to the terminal 10 connected to the packet network 1 as described above. Regardless of the type of communication service, it is desirable not to apply a restriction on the establishment of the call session by maintaining the call session.

As described above, the base station apparatus 100 according to the present invention first allows a call session to be established between the terminal 10 and the packet network 1 even under an overload condition, and the terminal is based on the call session set for the terminal 10. In (1), the type of communication service to be used is checked to maintain the call session in the case of VoLTE service, so that the VoLTE service can be provided to the terminal 10, and in the case of data service, the call session is released and then the call is The load of the base station apparatus 100 may be adjusted by applying the session establishment restriction policy.

Hereinafter, a configuration of a base station apparatus according to a preferred embodiment of the present invention will be described in more detail with reference to FIG. 2.

The base station apparatus 100 according to the present invention includes a call session setting unit 110 for setting a call session for a communication service based on the packet network 1 and a load of the base station apparatus 100 for the terminal 10. In the state, the communication service confirmation unit 120 confirms the type of communication service based on the call session set for the terminal 10 and the terminal 10 is set in accordance with the type of the checked communication service. It includes a call session controller 130 for maintaining a call session or release the call session set for the terminal 10.

The call session setting unit 110 establishes a call session for the communication service based on the packet network 1 for the terminal 10.

More specifically, the call session setting unit 110 establishes a call session from the packet network 1 to the terminal 10 as a packet network connection event requiring the packet network 1 connection to the terminal 10 occurs. You will receive a call setup request (eg, Activate Default Bearer Request Message).

Accordingly, the call session setting unit 110 transmits a call establishment request (eg, an activation default bearer request message) received from the packet network 1 to the terminal 10, and thus the terminal 10 and the base station apparatus 100. And a call session between the terminal 10 and the packet network 1, that is, a basic call session (eg, a default bearer), through interworking with other equipment (eg, S-GW, P-GW, etc.).

At this time, when the packet network connection event generated for the terminal 10 is associated with a call using the VoLTE service, the call session setting unit 110 further sets a specific call session for the terminal 10 from the packet network 1. You will further receive a call establishment request (eg, Activate Dedicated Bearer Request Message).

Accordingly, the call session setting unit 110 transmits a call session setting request (eg, Activate Dedicated Bearer Request Message) received from the packet network 1 to the terminal 10, and thus the terminal 10 and the base station apparatus 100. And a call session between the terminal 10 and the packet network 1, that is, an additional specific call session (eg, a dedicated bearer), through interworking with other equipment (eg, S-GW, P-GW, etc.).

The communication service checking unit 120 checks the type of communication service based on the call session set for the terminal 10 when the load of the base station apparatus 100 is overloaded.

That is, after the call session is established for the terminal 10 by the call session setting unit 110 as described above, the communication service confirmation unit 120 determines that the terminal (if the load of the base station apparatus 100 is overloaded). It is to check the type of communication service to be used by the terminal 10 based on the call session set up for 10).

The method of confirming the type of communication service based on the call session set for the terminal 10 will now be described in detail.

The communication service confirming unit 120 sets a basic call session (eg, a default bearer) for the terminal 10 in the call session setting unit 110, and then additionally sets a specific call session (eg, a dedicated bearer). In this case, it can be confirmed that the communication service intended to be used by the terminal 10 is the first communication service requiring a service quality guarantee of a certain level or more. Here, the first communication service may mean at least one of a VoLTE service and a video service in which real time is important. Hereinafter, for convenience of description, the VoLTE service will be described with reference.

More specifically, the communication service confirming unit 120 sets a basic call session (eg, a default bearer) for the terminal 10 in the call session setting unit 110, and then additionally calls a specific call session (eg, Dedicated). Upon receiving a session establishment request (eg, Activate Dedicated Bearer Request Message) requesting to establish a bearer, the quality level identifier related to the quality of service above a certain level is verified from the session establishment request (eg, Activate Dedicated Bearer Request Message). In this case, it can be confirmed that the communication service to be used by the terminal 10 is a first communication service, that is, a VoLTE service.

That is, the call session establishment request received from the packet network 1 may include a quality level identifier (QoS Class Indicator, for example) indicating a kind of call session establishment request.

Here, the quality level identifiers, or QCIs, of each call session (EPS Bearer) for each call type are shown in Table 1 below.

division QCI # 5 QCI # 6 QCI # 1 QCI # 2 Usage IMS signaling
-Default bearer Data call transfer
-Default bearer -VoLTE call forwarding
-Dedicated Bearer Video call transfer
-Dedicated Bearer Data services O O VoLTE Service O O O Video service O O O O

Accordingly, the communication service confirming unit 120 sets a basic call session (eg, a default bearer) for the terminal 10 in the call session setting unit 110, and then additionally establishes a specific call session (eg, a dedicated bearer). When a call establishment request (eg, Activate Dedicated Bearer Request Message) is received, the quality level identifier (QCI) is checked from the call establishment request (eg, Activate Dedicated Bearer Request Message).

Therefore, the communication service confirmation unit 120, if the quality level identifier QCI # 1 related to the service quality of a certain level or more is determined from the call establishment request (eg, Activate Dedicated Bearer Request Message), the terminal 10 intends to use it. It can be confirmed that the communication service is the first communication service, that is, VoLTE service.

On the other hand, the communication service confirmation unit 120, if only the basic call session (for example, Default Bearer) for the terminal 10 in the call session setting unit 110, the communication service to be used in the terminal 10 It can be confirmed that the data service does not require a second communication service, that is, a certain level of quality of service.

The call session controller 130 maintains the call session set for the terminal 10 according to the type of communication service checked by the communication service checker 120, and provides the communication service to the terminal 10 through the call session. Or the call session set for the terminal 10 is released to adjust the load of the base station apparatus 100.

That is, the call session controller 130 maintains the call session set for the terminal 10 when the type of the checked communication service is a first communication service, that is, a VoLTE service requiring a service quality guarantee of a certain level or higher. 10) make a call session to provide VoLTE service. That is, the call session controller 130 does not apply the restriction on the call session by maintaining the set call session with respect to the terminal 10 to use the VoLTE service even in an overloaded state.

Accordingly, the terminal 10 can make a call using a VoLTE service by connecting a VoLTE session with a counterpart terminal (not shown) through a call session and transmitting / receiving a VoLTE call, and the call session controller 130 is connected to the terminal 10. When the VoLTE service ends in the call session set for the terminal 10 can be released.

On the other hand, the call session controller 130 releases the call session set for the terminal 10 when the checked communication service is a second communication service, that is, a data service that does not require a service level guarantee of a certain level or higher. That is, the call session controller 130 applies a restriction on the call session by releasing the set call session for the terminal 10 to use the data service in an overload state.

After the call session controller 130 releases the call session set for the terminal 10 as described above, the call session controller 130 restricts the call session to the terminal 10 according to a predefined call session setting restriction policy. can do.

That is, the call session controller 130 releases the call session set for the terminal 10 as described above with reference to FIG. 1, and then sets the call session setting restriction information according to the call session setting restriction policy. By providing the terminal 10, the terminal 10 selectively attempts to connect to the packet network 1 based on the received call session setting restriction information.

Accordingly, as described above, the base station apparatus according to the present invention allows the call session to the terminal to be established first even under an overload condition, and checks what kind of communication service the terminal intends to use based on the call session set up as described above. By applying the restriction on the call session differently according to the type of communication service, it is possible to adjust the load of the base station efficiently while providing the normal service for the communication service (eg, VoLTE service) requiring high quality of service. Can produce effective effects.

Hereinafter, an operation flow of an operation method of a base station apparatus according to the present invention will be described with reference to FIGS. 3 to 4.

First, an overall control flow of a communication system including a base station apparatus according to the present invention will be described with reference to FIG. 3.

The base station apparatus 100 sets up a call session for a communication service based on the packet network 1 with respect to the terminal 10 (S20).

That is, the base station apparatus 100 requests the terminal 10 to establish a call session for the terminal 10 from the packet network 1 as a packet network connection event requiring the packet network 1 connection to the terminal 10 occurs (S10). When receiving a call setup request (eg, Activate Default Bearer Request Message), the terminal 10 transmits it to the terminal 10, the base station apparatus 100, and other equipment (eg, S-GW, P-GW). Etc.), a call session between the terminal 10 and the packet network 1, that is, a basic call session (eg, a default bearer) can be established.

At this time, when the packet network connection event generated for the terminal 10 is associated with a call using the VoLTE service, the base station apparatus 100 requests to further establish a specific call session for the terminal 10 from the packet network 1. Receives a call establishment request (for example, Activate Dedicated Bearer Request Message) is further received and forwarded to the terminal 10, the terminal 10 and the base station apparatus 100 and other equipment (for example, S-GW, P- Through interworking with the GW, a call session between the terminal 10 and the packet network 1, that is, an additional specific call session (eg, a dedicated bearer) may be established.

In this way, the base station apparatus 100, regardless of whether or not the load of the base station apparatus 100 is overloaded, call session for the communication service based on the packet network 1, that is, basic call session (for example) for the terminal 10 : Default Bearer), or it is possible to set a default call session (eg Default Bearer) and a specific call session (eg Dedicated Bearer) (S20).

After the call session is established for the terminal 10 as described above, the base station apparatus 100 sets a call to the terminal 10 if the load of the base station apparatus 100 is overloaded (S30). The type of communication service to be used in the terminal 10 is checked based on the session (S40).

Accordingly, the base station apparatus 100 maintains the call session set up for the terminal 10 according to the identified communication service type so that the communication service is provided to the terminal 10 through the call session or the terminal 10. The load of the base station apparatus 100 is adjusted by releasing the call session set with respect to FIG.

For example, the base station apparatus 100 maintains the call session set for the terminal 10 when the type of the checked communication service is a first communication service, that is, a VoLTE service requiring a service quality guarantee of a certain level or more (S50 Yes). The call session is provided to the terminal 10 so that the VoLTE service is provided. Accordingly, the terminal 10 may make a call using a VoLTE service by transmitting and receiving a VoLTE call by connecting a VoLTE session with a counterpart terminal (not shown) through a call session (S70). When the VoLTE service is terminated in the terminal 10, the base station apparatus 100 may release the call session set up for the terminal 10 (S75).

On the other hand, the base station apparatus 100, if the type of the checked communication service is a second communication service, i.e., a data service that does not require a service quality guarantee of a certain level or more (S50 NO), the base station apparatus 100 sets the call session set for the terminal 10. Release (S80).

Then, the base station apparatus 100, after the release of the call session as described above with respect to the terminal 10 to apply the restriction on the call session, it is possible to apply a predefined call session setting restriction policy (S90).

That is, the base station apparatus 100 releases the call session set up for the terminal 10 as described above, and then provides the call setup restriction information according to the call setup restriction policy to the terminal 10 (S92). In operation S94, the terminal 10 may operate according to the received call establishment restriction information to selectively attempt to connect to the packet network 1 (S94).

As described above, the base station apparatus 100 according to the present invention first allows a call session to be established between the terminal 10 and the packet network 1 even under an overload condition, and the terminal is based on the call session set for the terminal 10. In (1), the type of communication service to be used is checked to maintain the call session in the case of VoLTE service, so that the VoLTE service can be provided to the terminal 10, and in the case of data service, the call session is released and then the call is The load of the base station apparatus 100 may be adjusted by applying the session establishment restriction policy.

Hereinafter, an operation method of a base station apparatus according to a preferred embodiment of the present invention will be described in more detail with reference to FIG. 4. Prior to the description, the operation method of the base station apparatus according to the present invention described with reference to FIG. 4 will be described on the assumption that the load of the base station apparatus is overloaded for convenience of description.

In the operation method of the base station apparatus according to the present invention, a call session for the communication service based on the packet network 1 is established for the terminal 10.

In more detail, in the method for operating a base station apparatus according to the present invention, a packet session connection event is generated from the packet network 1 to the terminal 10 as a packet network connection event requiring the packet network 1 connection to the terminal 10 occurs. You will receive a session setup request (eg, Activate Default Bearer Request Message) requesting to set the

Accordingly, in the method of operating the base station apparatus according to the present invention, a call establishment request (eg, Activate Default Bearer Request Message) received from the packet network 1 is transmitted to the terminal 10, and the terminal 10 and the base station apparatus ( 100) and interworking with other equipment (eg S-GW, P-GW, etc.), it is possible to establish a call session, that is, a basic call session (eg, Default Bearer) between the terminal 10 and the packet network (1) S100).

At this time, when the packet network connection event generated for the terminal 10 is associated with a call using the VoLTE service, the operation method of the base station apparatus according to the present invention further comprises a specific call session from the packet network 1 to the terminal 10. You will also receive a call establishment request (eg, an Activate Dedicated Bearer Request Message) requesting to set up a.

Accordingly, in the method of operating the base station apparatus according to the present invention, the call establishment request (eg, Activate Dedicated Bearer Request Message) received from the packet network 1 is transmitted to the terminal 10, and the terminal 10 and the base station apparatus ( 100) and interworking with other equipment (eg S-GW, P-GW, etc.), it is possible to establish a call session between the terminal 10 and the packet network (1), that is, additional specific call session (eg Dedicated Bearer) have.

The operation method of the base station apparatus according to the present invention checks the type of communication service based on the call session set up for the terminal 10.

That is, in the method of operating the base station apparatus according to the present invention, after the call session is established for the terminal 10 as described above, if the load of the current base station apparatus 100 is overloaded, the call set for the terminal 10 is set. It is to check the type of communication service to be used by the terminal 10 based on the session.

More specifically, in the method for operating a base station apparatus according to the present invention, after setting a basic call session (eg, a default bearer) for the terminal 10, it is determined whether a specific call session (eg, a dedicated bearer) is additionally set. (S110), and additionally, when a specific call session (eg, a dedicated bearer) is set, it is confirmed that the communication service intended to be used by the terminal 10 is a first communication service that requires a service quality guarantee of a certain level or higher, that is, VoLTE service. Can be.

More specifically, the operation method of the base station apparatus according to the present invention, after setting a basic call session (for example, the default bearer) for the terminal 10, request to further establish a specific call session (for example, Dedicated Bearer) When receiving a session setup request (e.g., Activate Dedicated Bearer Request Message), the quality level identifier QCI # 1 related to the quality of service above a certain level is identified from the session setup request (e.g., Activate Dedicated Bearer Request Message). S120 YES), it may be confirmed that the communication service to be used by the terminal 10 is a first communication service, that is, a VoLTE service.

Accordingly, in the method of operating the base station apparatus according to the present invention, if the type of the checked communication service is a first communication service, that is, a VoLTE service requiring a service quality guarantee of a certain level or more, the call session set for the terminal 10 is maintained. The terminal 10 connects a VoLTE session with a counterpart terminal (not shown) through a call session to transmit / receive a VoLTE call so as to make a call using a VoLTE service (S130).

In addition, in the method of operating the base station apparatus according to the present invention, when the VoLTE service is terminated in the terminal 10, the call session set for the terminal 10 may be released (S140).

On the other hand, the operation method of the base station apparatus according to the present invention, if only a basic call session (for example, Default Bearer) is set without additional call session (for example, Dedicated Bearer) to the terminal 10 in step S110 If it is determined (S110 No), it can be confirmed that the communication service to be used in the terminal 10 is a second communication service, that is, a data service that does not require a service quality guarantee of a certain level or more.

Alternatively, the operation method of the base station apparatus according to the present invention, if the quality level identifier QCI # 1 associated with the service quality above a certain level is not confirmed from the session establishment request in step S120 (S120 No), the terminal 10 is intended to use. It can be confirmed that the communication service is not the first communication service.

DLDP, the operation method of the base station apparatus according to the present invention, if the type of the confirmed communication service is a second communication service, that is, a data service that does not require the service quality guarantee of a certain level or more, the call session set for the terminal 10 Release (S150).

In addition, in the operation method of the base station apparatus according to the present invention, after releasing the call session set up for the terminal 10 as described above, the call session with respect to the terminal 10 in accordance with a predefined call session setting restriction policy. The setting may be restricted (S160).

That is, in the operation method of the base station apparatus according to the present invention, as described with reference to FIG. 1 described above, after releasing the call session set up for the terminal 10, the call setup restriction according to the call setup restriction policy. By providing the information to the terminal 10, the terminal 10 selectively attempts to connect to the packet network 1 based on the received call-session setting restriction information.

As described above, the operation method of the base station apparatus according to the present invention allows the call session to the terminal to be established first even under an overload condition, and determines what kind of communication service the terminal intends to use based on the call session set up as described above. By checking and limiting call sessions differently according to the type of communication service, it is possible to efficiently service the load of the base station while providing normal service for communication services (eg, VoLTE service) requiring high quality of service. Can adjust the effect.

A method of operating a base station apparatus according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks 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 code, such as 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 device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

By varying the restriction on the corresponding call session according to what kind of communication service the call session set up for the terminal in the base station, the base station is normally serviced for the communication service requiring high quality of service The ability to efficiently adjust the load of the base station while providing it is possible, as it overcomes the limitations of existing technologies, not only the use of related technologies but also the possibility of market or sales of the applied devices is not only sufficient but also realistically implemented. Since it can be done, it is an invention with industrial applicability.

1: packet network
10: terminal 100: base station apparatus
110: session setter 120: communication service checker
130: the session control unit

Claims (12)

In the base station apparatus,
A call session setting unit for setting a call session for a packet network based communication service to a terminal;
A communication service checking unit for checking a type of the communication service based on a call session set for the terminal when the load of the base station apparatus is overloaded;
A call session control unit for maintaining a call session set for the terminal or releasing a call session set for the terminal according to the identified communication service type;
The communication service confirmation unit,
The base station characterized in that the call session setting unit determines the type of the communication service according to whether or not receiving a call session setup request requesting to establish a specific call session after setting a basic call session for the terminal; Device. The method of claim 1,
The call session controller,
If the type of communication service is a first communication service requiring a service quality guarantee of a certain level or more, the communication service is provided to the terminal through the call session by maintaining a call session set for the terminal.
And a base station apparatus for releasing a call session set for the terminal to adjust the load of the base station apparatus when the type of the communication service is a second communication service that does not require a service quality guarantee of more than a specific level. The method of claim 2,
The communication service confirmation unit,
The base station apparatus, characterized in that the communication service is the first communication service when the call session setting unit after setting a basic call session for the terminal further set a specific call session. The method of claim 2,
The communication service confirmation unit,
When the call session setup unit receives a call setup request requesting to set up a specific call session after establishing a basic call session for the terminal, the quality related to the service quality of the specific level or more from the call session setup request. And when the level identifier is confirmed, confirming that the communication service is the first communication service. The method of claim 2,
The communication service confirmation unit,
And the base station apparatus confirming that the communication service is the second communication service when only the basic call session is set for the terminal by the call session setting unit. The method according to any one of claims 1 to 5,
The call session controller,
And releasing the call session set for the terminal and limiting the call session set up for the terminal according to a predefined call session setting restriction policy. In the operation method of the base station apparatus,
A call session establishment step of establishing a call session for a packet network based communication service for a terminal;
A communication service checking step of confirming a type of the communication service based on a call session set for the terminal when the load of the base station apparatus is overloaded; And
A call session control step of maintaining a call session set for the terminal or releasing a call session set for the terminal according to the identified communication service type,
The communication service confirmation step,
The base station, characterized in that for determining the type of the communication service according to whether or not receiving a call session setup request requesting to set up a specific call session after establishing a basic call session for the terminal in the call session setup step How the device works. The method of claim 7, wherein
The call session control step,
If the type of communication service is a first communication service requiring a service quality guarantee of a certain level or more, the communication service is provided to the terminal through the call session by maintaining a call session set for the terminal.
When the type of the communication service is a second communication service that does not require a service quality guarantee of more than the specified level of the base station apparatus characterized in that the load of the base station apparatus is adjusted by releasing the call session set for the terminal How it works. The method of claim 8,
The communication service confirmation step,
And in the case of establishing a basic call session for the terminal in the call session setting step, further confirming that the communication service is the first communication service. The method of claim 8,
The communication service confirmation step,
In the call session setup step, when a basic call session is established for the terminal and a call session setup request requesting to set up a specific call session is received, And when the level identifier is identified, confirming that the communication service is the first communication service. The method of claim 8,
The communication service confirmation step,
And if only a basic call session is set for the terminal in the call session setting step, confirming that the communication service is the second communication service. The method of claim 7, wherein
And releasing the call session set for the terminal, and limiting the call session set up for the terminal according to a predefined call session establishment restriction policy.

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