KR102069339B1 - System and method for data traffic off-load - Google Patents

Abstract

In order for the data traffic switching induction system to induce the switching of data traffic provided to the terminal, when the terminal attempts to connect to the radio signal processing unit and uses a service in the first network, the data traffic switching induction system is adjacent to the first radio signal processing unit and the first radio signal processing unit. Check the available resources of the radio signal processor to see if an overload has occurred. If an overload occurs in both the first radio signal processor and the adjacent radio signal processor, the terminal induces data traffic switching by controlling the terminal to use a service from the second network through a switching connection to a second network different from the first network.

Description

System and method for data traffic off-load}

The present invention relates to a system and method for inducing data traffic conversion.

In general, when inducing data traffic from one network to another network, the data communication of the terminal is disconnected due to the switching to different heterogeneous networks. Heterogeneous manganese mobility support technology has been studied to eliminate such disconnection of data communication. The heterogeneous mobility support technology provides a seamless data connectivity to a user when the terminal switches a network between multiple wireless network interfaces (for example, Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), and WiFi). It is a technique for doing.

The heterogeneous network support technology is classified into a terminal-based mobility support technology and a network-based mobility support technology. In the terminal-based mobility support technology, since the terminal is to be a subject of mobility control and perform mobility processing, it is necessary to change the terminal framework and the kernel level, and there is a limitation in the dissemination due to porting issues for each terminal.

On the other hand, the network-based mobility technology is designed to minimize the change of the terminal and to support the mobility between heterogeneous networks based on the network-side equipment. It recognizes the mobility-related operation that the terminal was processing in the network and processes the agent.

In the case of the network-based mobility support technology, the network-side equipment of the terminal does not consider an available resource environment of a base station (composed of a radio unit (RU) and a digital signal processor (DU) in a cloud environment). It causes access network switching. At this time, the base station becomes. Therefore, if an overload occurs in the digital signal processing unit, the load balancing effect to other networks cannot be expected.

In addition, since the overload-related information of the current wireless signal processing unit collects information using a method such as a simple network management protocol (SNMP), there is a problem in that real-time guarantee is difficult. Therefore, when the total available resources that can be processed by the digital signal processor connected to one or more wireless signal processors are insufficient, switching to the corresponding resources is impossible.

When the digital signal processing unit requests signal processing for more than the resource available for processing, the connection of the terminal data call may fail due to delay / missing or rejection. In addition, there is a problem that it is difficult to ensure the real-time for the overload-related information.

In addition, when connecting a bearer of a terminal through a non-3GPP (non-3GPP) network such as WiFi that configures a packet data network gateway (P-GW) as an anchor, the P-GW is a 3rd generation (3GPP) of the terminal. Deactivation of the terminal bearer of the Partnership Project (eg, WCDMA, LTE). In this case, the terminal may perform IP data communication through a non-3GPP access connection, but when a service (eg, voice call, MMS) that must use 3GPP access occurs, a new bearer connection and IP with the P-GW occur. The communication path needs to be secured.

In addition, in case of a terminal service, a service notification to a terminal by paging and a service request through a mobility management entity (MME) is required. However, since all 3GPP side bearers of the terminal are inactivated, the MME manages the terminal in an EMM-deregistered state, thereby rejecting a corresponding paging and service request.

Accordingly, the present invention provides a system and method for converting and inducing data traffic by recognizing the situation of processing available resources for each digital signal processor and radio signal processor.

Method for inducing the conversion of data traffic provided to the terminal data traffic switching induction system which is one feature of the present invention for achieving the technical problem of the present invention,

Each of the one or more digital signal processing units is linked with a plurality of radio signal processing units, and when the terminal attempts to connect to the first radio signal processing unit and uses a service in the first network, the first radio signal processing unit and the first radio signal Checking an available resource of a radio signal processor adjacent to the processor to determine whether an overload has occurred; If it is determined that an overload has occurred in the first radio signal processor, determining whether there is a radio signal processor that is not overloaded among the adjacent radio signal processor; And if the neighboring radio signal processor is overloaded, controlling the terminal to use a service from the second network through a switching connection to a second network different from the first network.

The step of checking whether the overload has occurred may include checking data traffic transmitted and received through a port allocated to the first radio signal processor to which the terminal attempts to connect; And checking whether the amount of data traffic is greater than a threshold set in advance for the first radio signal processor.

The checking whether the overload has occurred may include registering location information of the terminal.

The step of checking whether the radio signal processor is not overloaded, if the radio signal processor is not overloaded, the digital signal processor in conjunction with the radio signal processor is not overloaded, the first digital signal processor or Checking which of the second digital signal processors is connected to the digital signal processor; And if the radio signal processing unit in which the overload has not occurred is connected to the second digital signal processing unit, controlling to perform an in-network switching procedure.

After controlling to use a service from the second network, the second network includes a heterogeneous gateway, a packet data network gateway (P-GW), a serving gateway (S-GW), and a mobility management entity (MME). The heterogeneous gateway transmits the access network change information of the terminal to the MME and requests the terminal to access the second network; Checking whether the terminal has been allocated an IP address for use in the second network, and attempting to access the second network if the terminal has been assigned an IP address; Requesting bearer switching of the terminal to the P-GW, and requesting bearer clearance with a first network allocated to the MME when the terminal accesses the first network; The MME arranging bearers with a first network for the terminal, and the heterogeneous network gateway forwarding a data call to the terminal; And accessing, by the terminal, a second network and using a service using the data call.

The attempting access may include: requesting, by the terminal, terminal authentication and an IP address from the P-GW; And performing the authentication of the terminal by the P-GW, and when the authentication is completed, generating the IP address to be used by the terminal and providing the terminal to the terminal.

The transmitting of the data call to the terminal may include changing the state of the terminal by changing the terminal state from the connected state to the standby state.

The system for inducing the conversion of data traffic provided to the terminal which is another feature of the present invention for achieving the technical problem of the present invention,

A terminal position checking unit for checking and storing the position information of the terminal when the terminal attempts to connect to the radio signal processor; An overload confirmation unit for checking whether the radio signal processor to which the terminal attempts to connect and at least one adjacent radio signal processor adjacent to the radio signal processor are overloaded; And a network switching determining unit configured to determine and control the switching of the terminal into the network or the switching of the network to the heterogeneous network according to whether the radio signal processing unit is overloaded.

The overload confirming unit checks the amount of data traffic transmitted / received to a port allocated to each of the radio signal processing unit and the adjacent radio signal processing unit, and for the maximum traffic throughput allocated to each of the radio signal processing unit and the adjacent radio signal processing unit. If data traffic occurs above a preset threshold, the radio signal processor may be overloaded.

According to the present invention, it is possible to induce data conversion into a 3GPP network as well as a non-GPP network by inducing traffic conversion of the digital signal processor level.

In addition, the load balancing of the overload control of the digital signal processing unit is possible by inducing the switching between the heterogeneous networks of the terminal traffic, and the terminal can be controlled based on real-time network information, thereby enabling efficient use of the digital signal processing unit resources.

In addition, it is possible to realize the always-on function of the non-3GPP linked multi-radio network by configuring the function on the 3GPP core network side while minimizing the terminal change.

1 is an exemplary view showing a system environment according to an embodiment of the present invention.
2 is a structural diagram of a conversion induction system according to an embodiment of the present invention.
3A and 3B are flowcharts illustrating a method of inducing conversion according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

In the present specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user device (User). It may also refer to an Equipment (UE), an Access Terminal (AT), or the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR ( Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a NodeB, a base transceiver station, and an MMR-BS.

In the embodiment of the present invention, the terminal is a 3GPP network (hereinafter, referred to as 'RU' for convenience of explanation) and a digital signal processor (hereinafter referred to as 'DU' for convenience of description). For convenience of explanation, it is referred to as 'first network'. The terminal accessing the network notifies its current location to the DU, and the DU allocates available resource resources to the terminal. One DU is associated with a plurality of RUs, and one cloud networking environment is composed of a plurality of DUs.

In a situation where the UE accesses an RU connected to one DU, it is assumed that the UE enters coverage, which is a service providing area of another RU, and registers location information. The DU connected to the RU of the newly entered region by the terminal may determine whether the RU connected to the terminal may provide a service to the terminal, that is, whether the resource resource is overloaded. Here, it is assumed that the DU is different from the DU connected to the RU to which the terminal is initially connected.

The new DU determines whether there is a switchable RU of data to be provided to the terminal through the DU-RU connection interface. If one or more RUs connected to the DU is determined to be overloaded, the first network requests a non-3GPP network (hereinafter, referred to as a "second network") gateway to induce a switching access of the terminal. At the same time, the DU provides information on whether to induce terminal switching to the MME managing the terminal state of the first network.

Hereinafter, a system and method for converting and inducing data traffic according to an embodiment of the present invention will be described with reference to the accompanying drawings. An embodiment of the present invention describes a system environment for moving a connection of a terminal from a first network to a second network according to an overload in a DU.

1 is an exemplary view showing a system environment according to an embodiment of the present invention.

As shown in FIG. 1, the first DU 10-1 is connected to the first RU 20-1 and the second RU 20-2, and a third DU 10-2 is connected to the third DU 10-1. The RU 20-3 and the fourth RU 20-4 are connected to each other.

The first DU 10-1 and the second DU 20-2 manage the location or state of the terminal 70 to manage the mobility of the terminal 70 between the MME 30 and the base station of the terminal 70. It is connected to an S-GW (Serving GateWay) 40 which serves as an anchor during handover. The MME 30 and the S-GW 40 are connected to a P-GW (Packet Data Network GateWay) 50 which performs a role of assigning an IP address to the terminal 70 and managing QoS.

In addition, the P-GW 50, the first DU 10-1, and the second DU 20-2 interwork with a heterogeneous network gateway 60 that controls a connection to a second network different from the first network. do. The heterogeneous network gateway 60 interworks with the heterogeneous network access point 80 that authenticates the terminal 70 and provides an IP address. Here, the first network will be described using a 3GPP network such as WCDMA or LTE, and the second network as a non-3GPP network such as CDMA or WiFi.

In such an environment, the terminal 70 is connected to the first network and is provided with a service from an RU connected to either one of the first DU 10-1 or the second DU 10-2, and then the other RU. Suppose you have moved to an area. As a result of the determination of the DU connected to the moved RU, it is assumed that all the RUs adjacent to the moved RU are overloaded. Then, the new DU is to provide the service through the second network to the terminal 70 that was provided with the service through the first network to the heterogeneous network gateway 60.

For example, as follows. The RUs 20-1 and 20-2 connected to the first DU 10-1 are not overloaded, and the RUs 20-3 and 20-4 connected to the second DU 10-2 are Assume that an overload has occurred. The RUs 20-3 and 20-4 connected to the second DU 10-2 from one of the RUs 20-1 and 20-2 connected to the first DU 10-1 by the terminal 70. Assume that we go to.

When the terminal 70 is connected to the first DU 10-1 to the second RU 20-2, the mobile terminal 70 moves to the second DU 10-2 to the third RU 20-3 to create a new third RU. Suppose you try to connect to (20-3). In this case, the second DU 10-2 may not only have a third RU 20-3 and a fourth RU 20-4 connected thereto, but also a second RU (20) adjacent to the third RU 20-3. It is determined whether the resource of 20-2) can provide a service to the terminal 70, that is, whether it is overloaded.

At this time, since it is assumed that the second RU 20-2 does not generate an overload, the second DU 10-2 may use available resources of the second RU 20-2 of the first DU 10-1. By judging, it is confirmed that enough resources are available to provide a service to the terminal 70. And in-network switching to switch back to the second RU 20-2. Here, the switching procedure in the network is already known, and detailed descriptions are omitted in the embodiments of the present invention.

However, when the terminal 70 attempts to connect to the fourth RU 20-4, the second DU 10-2 is the fourth RU 20-4 and the third RU 20-3, which is the peripheral RU. Check your available resources. Since it is assumed that the third RU 20-3 and the fourth RU 20-4 are overloaded, the second DU 10-2 determines the network switching connection of the terminal 70 to the second network.

In this case, the second DU 10-2 requests the switched access of the terminal 70 to the heterogeneous network gateway 60, and at the same time, the terminal 70 attempts the switched access to the second network to the MME 30. Information. When the terminal 70 prepares an interface to the second network and attempts to access, the terminal 70 processes authentication of the terminal 70 through a heterogeneous network access point 80 and obtains IP address information.

In this case, the heterogeneous network gateway 60 requests the bearer of the terminal 70 to the P-GW 50. The P-GW 50 accepts the new bearer connection request from the heterogeneous network gateway 60 and releases the bearer connected to the first network of the existing terminal 70.

When the P-GW 50 releases the bearer of the first network connected to the terminal 70, the P-GW 50 sends a bearer request to the S-GW 40 and the MME 30 (delete bearer request). Send a message. At this time, the cause field of the message is transmitted by including a radio access technology (RAT) value converted through a connection from the first network to the second network.

Upon receiving the bearer removal request message from the P-GW 50, the MME 30 cleans up the bearer associated with the terminal 70. At this time, it is performed by a method different from the existing bearer grooming method. That is, the DRB (Data Radio Bearer) between the terminal 70 and the base station is released, and the GTP-U tunnel between the base station and the S-GW 40 is released. However, the downlink Tunnel End Point ID (TEID) is maintained in the S-GW 40. As a result, the network switching procedure of the terminal 70 is completed.

The structure of the switching induction system included in the DU to convert the data traffic provided to the terminal 70 from the first network to the second network or in the network according to whether the RU linked to the DU and the adjacent RUs are overloaded. It demonstrates with reference to FIG.

2 is a structural diagram of a conversion induction system according to an embodiment of the present invention.

As shown in FIG. 2, the switching induction system 100 includes a terminal location checking unit 110, an overload checking unit 120, and a network switching determining unit 130.

The terminal location checking unit 110 registers and confirms the location of the terminal 70 when the terminal 70 enters an area of one of the RUs connected to the DU and attempts to connect with the RU. .

The overload confirmation unit 120 is overloaded with the RUs adjacent to the RU as well as the RU attempting to connect based on the location information of the terminal 70 to which the terminal location determiner 110 attempts to connect to the RU. Check if it occurred. In this case, the adjacent RU may be an RU which is interworked with the DU to which the RU to which the terminal 70 attempts to connect is connected, or may be an RU which is interworking with the adjacent DU.

There are several methods for checking whether the overload checker 120 overloads the RU. In an embodiment of the present invention, the amount of data traffic going to and from a port allocated to each RU is determined. If data traffic is generated above a predetermined threshold for the maximum traffic throughput that can be handled by the RU, it is determined that the corresponding RU is overloaded.

When checking whether the RU connected to the adjacent DU is overloaded, it checks by receiving the information on whether the RU interworking with the adjacent DU is overloaded. Therefore, the overload check unit 120 checks whether the RU is overloaded according to a preset time or when the terminal attempts to connect with the RU. If a request message for overloading the RU is received from an adjacent DU, information on whether the RU is overloaded is also provided.

The network switching determining unit 130 determines the switching of the terminal 70 in the network or the network switching to the heterogeneous network according to whether the RU is overloaded by the overload checking unit 120. That is, when the overload confirming unit 120 confirms that not only the RU to which the terminal 70 attempts to access but also the adjacent RUs are all overloaded, the network switching determining unit 130 determines the terminal (from the first network to the second network). 70) decide to switch the network connection. However, if any one of the RUs including the adjacent RU is not overloaded, it determines the connection of the terminal 70 to the corresponding RU to induce switching in the network.

Referring to FIGS. 3A and 3B, a conversion induction method for providing the data provided to the terminal 70 by the switching induction system 100 described above according to whether the RU is loaded or switched between networks is provided. An embodiment of the present invention will be described on the assumption that the terminal 70 attempts to connect to the third RU 20-3 of FIG. 1 for convenience of description.

3A and 3B are flowcharts illustrating a method of inducing conversion according to an embodiment of the present invention.

First, as shown in FIG. 3A, the terminal 70 attempts to connect with the third RU 20-3, which is an access point of the first network (S100), and the third RU 20-3 and the third RU ( The second DU 10-2 with which 20-3 interworks registers the current location of the terminal 70. In the exemplary embodiment of the present invention, since the conversion induction system 100 is described as an example included in the DU, the terminal location checking unit 110 of the conversion induction system 100 registers the current location of the terminal 70. Whenever the terminal 70 registers a location, it manages the mapping of the RU and the DU (S110).

When a data connection request is generated together with the connection attempt of the terminal 70, the overload confirmation unit 120 determines whether the terminal 70 attempts to connect or whether the third RU 20-3 currently connected is overloaded. Check (S120). In addition, the available resources of the second RU 20-2 and the fourth RU 20-4 adjacent to the third RU 20-3 are also identified. Here, the detailed description of the method of identifying the adjacent RU of the third RU 20-3 will be omitted.

Overload check unit 120 checks whether the overload occurs in the third RU (20-3) (S130). If an overload has not occurred in the third RU 20-3, resources of the third RU 20-3 are allocated to the terminal (S150), and a data connection is induced to the terminal 70 (S160). Here, the method of checking whether the RU is overloaded is to check the amount of data traffic transmitted / received through a port allocated to each RU, and to determine that an overload has occurred when the amount of the checked data traffic exceeds a preset threshold. . Here, the preset threshold may be calculated based on the maximum data traffic throughput that the corresponding RU can handle, and a detailed description thereof will be omitted.

However, if it is determined in step S130 that the overload occurs in the third RU (20-3), the overload check unit 120 checks whether the overload occurs in all adjacent RU (S140). If an overload has not occurred in any one RU, resources of the corresponding RU are allocated to the terminal 70.

In this case, if the DU to which the RU which does not generate an overload is connected is the first DU 10-1, the network switching determining unit 130 determines the intra-network switching of the corresponding terminal 70. In operation S160, when the data connection is induced, the control unit is controlled to induce the data connection after the switching connection to the RU of the first DU 10-1 (S160).

On the other hand, if it is determined in step S140 that the overload occurred in all the RU is not enough controllable resources in the DU, the network switching determination unit 130 determines the network switching to the heterogeneous network of the terminal 70 and heterogeneous A network switch request is made to the network gateway 60 (S170). The following procedure will be described with reference to FIG. 3B.

As shown in FIG. 3B, when the network switching determining unit 130 requests the network switching of the terminal 70 to the heterogeneous network gateway 60, the heterogeneous network gateway 60 sends the terminal 70 to the MME 30. The network change information indicating that the access network is changed is transmitted (S200). In this case, the network change information includes an identifier of the terminal and location information of the current terminal.

The heterogeneous network gateway 60 requests the terminal 70 to switch the access to the second network (S210), and the terminal 70 requests the authentication and the assignment of the IP address to the P-GW 50 (S220). . The P-GW 50 authenticates the terminal according to the request of step S220, and when the authentication is completed, generates the IP address and provides the terminal 70 to the terminal 70 (S230).

The terminal 70 checks whether the authentication of the terminal 70 has been successfully performed based on the information received through the step S230, and is assigned an IP address to be used in the second network (S240). If the P-GW 50 fails to authenticate the terminal 70 or is not assigned an IP address, the terminal 70 maintains the connection of the first network (S250). In this case, when the authentication of the terminal 70 fails or when the IP address is not assigned, various cases may exist, and the present invention is not limited to any one case.

However, if the authentication is successful and the IP address is assigned, the terminal 70 attempts to access the second network through the heterogeneous network gateway 60 based on the corresponding IP address (S260). The heterogeneous network gateway 60 requests the P-GW 50 to bearer switching for the terminal required for the terminal 70 to receive a service through the second network (S270).

The P-GW 50, which has been requested to switch the bearer, performs a bearer cleanup procedure with the first network to clean up the bearer for the first network that is already allocated to the corresponding terminal 70. First, the P-GW 50 requests the MME 30 to clean up a bearer generated between the first network and the terminal 70 (S280), and the received MME 30 cleans up the bearer of the first network. The state of the terminal is changed from the connected state to the idle state by changing the state of the terminal and then notified to the P-GW 50 (S300, S310). That is, the connection to the bearer between the terminal 70 and the S-GW 40 is released, but the P-GW 50 may maintain the IP address of the terminal provided by the P-GW 50 when downlink traffic occurs. And the tunnel between the S-GW 40 is maintained.

In this case, the MME 30 maintains the downlink side TEID for the terminal 70 managed by the S-GW 40, but does not maintain the uplink TEID. In addition, the structure must be maintained to enable a service request for a terminal service such as a voice call service or a multi message service (MMS) requiring signaling to the terminal 70 through the MME 30.

When the MME 30 completes the state change of the terminal 70, the P-GW 50 notifies the heterogeneous network gateway 60 that the bearer for the first network of the terminal 70 is in a clean state (S320). . At the same time, when the P-GW 50 generates a bearer for the second network so that the terminal 70 can receive a service through the second network, the P-GW 50 notifies that the bearer for the first network is arranged in step S320. Provide together.

 Then, the heterogeneous network gateway 60 transmits the data call to use the service through the bearer of the second network generated by the terminal 70 (S330). The terminal 70 completes the switching connection to the second network (S340), and receives a data packet through the second network.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (10)

In the data traffic switching induction system to induce the conversion of data traffic provided to the terminal,
When at least one digital signal processor is linked to a plurality of radio signal processors, the terminal attempts to connect to the first radio signal processor to use a service in a first network.
Checking an available resource by checking an available resource of the first radio signal processor and the radio signal processor adjacent to the first radio signal processor;
If it is determined that an overload has occurred in the first radio signal processor, checking whether there is a radio signal processor that is not overloaded among the adjacent radio signal processor; And
If all of the adjacent radio signal processing units are overloaded, controlling the terminal to use a service from the second network through a switching connection to a second network different from the first network;
Data traffic conversion induction method comprising a. The method of claim 1,
Checking whether the overload has occurred,
Confirming data traffic transmitted and received through a port allocated to a first radio signal processor to which the terminal attempts to connect; And
Checking whether the amount of data traffic is greater than a threshold set in advance for the first radio signal processor;
Data traffic conversion induction method comprising a. The method of claim 2,
Checking whether the overload has occurred,
Registering location information of the terminal;
Data traffic conversion induction method further comprising. The method of claim 1,
The step of checking whether there is a radio signal processing unit is not overloaded,
If there is no overload radio signal processor, checking whether the digital signal processor interworked with the overload radio signal processor is connected to one of the first digital signal processor and the second digital signal processor. ; And
Controlling to perform an in-network switching procedure when the radio signal processing unit in which the overload has not occurred is connected to the second digital signal processing unit.
Data traffic conversion induction method comprising a. The method of claim 1,
After controlling to use a service from the second network,
The second network includes a heterogeneous gateway, a packet data network gateway (P-GW), a serving gateway (S-GW), and a mobility management entity (MME).
Transmitting, by the heterogeneous gateway, the access network change information of the terminal to the MME, and requesting the terminal to access a second network;
Checking whether the terminal has been allocated an IP address for use in the second network, and attempting to access the second network if the terminal has been assigned an IP address;
The heterogeneous gateway requests bearer switching of the terminal to the P-GW, and the P-GW requests bearer clearance with a first network allocated to the MME when the terminal accesses a first network;
The MME arranging a bearer with a first network for the terminal, and the heterogeneous gateway forwarding a data call to the terminal; And
The terminal accessing a second network and using a service by using the data call
Data traffic conversion induction method comprising a. The method of claim 5,
Attempting the connection,
Requesting, by the terminal, terminal authentication and an IP address from the P-GW; And
The P-GW performing authentication on the terminal, and when the authentication is completed, generating an IP address to be used by the terminal and providing the terminal to the terminal;
Data traffic conversion induction method comprising a. The method of claim 5,
The step of transmitting a data call to the terminal,
Changing the state of the terminal by changing the terminal state from a connected state to a standby state;
Data traffic conversion induction method comprising a. The method of claim 7, wherein
Changing the state of the terminal,
The MME releases the connection to the bearer between the terminal and the S-GW and maintains the IP address of the terminal provided by the P-GW when downlink traffic occurs. The tunnel between the P-GW and the S-GW How to keep data traffic diverted. In the system for inducing switching of data traffic provided to the terminal,
A terminal location checking unit that checks and stores location information of the terminal when the terminal attempts to connect to a first radio unit (RU) connected to a first digital unit (DU);
An overload confirmation unit confirming whether an overload of a plurality of second RUs adjacent to the first RU and the first RU to which the terminal attempts to connect and connected to the first DU or the second DU; And
If the second RU of the plurality of second RUs has available resources to provide the service that the terminal wants to use, the terminal switches the network to the one of the second RUs as a result of the overload confirming unit. And a network switching determining unit for determining and controlling a network switching to a heterogeneous network of the terminal if an overload occurs in all of the plurality of second RUs.
Data traffic conversion induction system comprising a. The method of claim 9,
The overload confirmation unit,
Confirm an amount of data traffic transmitted and received to a port allocated to each of the first RU and the plurality of second RUs, and preset a maximum traffic throughput allocated to each of the first RU and the plurality of second RUs The system of claim 1, wherein when the data traffic occurs above one threshold, the first RU is overloaded.

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