KR101734482B1 - Method for traffic offloading and receiving control, and communication system - Google Patents

Abstract

A method for offloading traffic from a local gateway connected between a private network and a base station comprises the steps of: determining whether traffic transmitted by a user terminal located in the intra-company network and connected to the base station is a data call traffic; And offloading the received traffic to the in-house network.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a traffic offloading method, a traffic arrival control method,

The present invention relates to a traffic offloading method, a traffic reception control method, and a communication system.

Various attempts have been made to maintain the security of the communication network inside the enterprise, that is, the internal network. These attempts have generally developed in a direction to prevent intrusion from the external network to the internal network. For example, in order to access the internal network from a terminal outside the enterprise, a predetermined secure channel (for example, a VPN (Virtual Private Network) channel or the like) may be used or a method of supporting access to an intranet within the enterprise may be used.

Conventionally, this method is limited to a wired terminal. However, nowadays most of the users are able to access the internet and carry smart phones and tablet PCs. Therefore, in order to prevent the leakage of corporate information, such a mobile device can be used. In order to prevent the leakage of enterprise information, a company prohibits the use of a mobile device when the mobile device is located in an enterprise have.

This method can also be applied to one-off external visitors, which may cause discomfort. Also, if the use of the mobile device is prohibited, it is inconvenient for users because voice calls can not be performed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method of controlling traffic offload of an intra- .

According to an aspect of the present invention, a traffic offloading method is a method for offloading traffic from a local gateway connected between a home network and a base station, the method comprising: receiving traffic transmitted from a user terminal located in the intra- Determining whether the data call traffic is a data call traffic, and offloading the traffic to the internal network when it is determined that the data call traffic is the data call traffic.

After the determining,

And transmitting the traffic to the external network through the base station if the data call traffic is not the data call traffic.

Wherein the determining step comprises:

It is possible to distinguish the type of the received traffic based on the QoS class identifier (QCI) assigned to the bearer of the traffic to determine whether it is the data call traffic.

Before the determining step,

Determining whether the subscriber information of the user terminal is a corporate subscriber by checking the subscriber information of the user terminal and transmitting the traffic to the external network if the subscriber is not the subscriber;

Wherein the determining step comprises:

If it is the enterprise subscriber, it can determine whether it is the data call traffic.

The method of claim 1,

It is possible to determine whether it is the enterprise subscriber based on the SPID (Subscriber Profile ID) of the user terminal.

According to another aspect of the present invention, a traffic call control method is a method of controlling traffic arrival in a private network connected to a private network and a base station, the method comprising: receiving traffic from a first user terminal located in the intra- Requesting paging to a second user terminal located in the in-house network, to which the traffic is to be received, and when the paging procedure with the second user terminal is completed, receiving the traffic to the second user terminal do.

Wherein the step of requesting the second user terminal for paging comprises:

Requesting a paging of the second user terminal to a mobility management entity, the base station managing mobility of the user terminal, the mobility management entity requesting paging to the second user terminal, And when the paging response is received from the second user terminal, the base station and the second user terminal are connected to each other to successfully complete the paging procedure.

Wherein the receiving comprises:

Transmitting the traffic to a base station connected to the second user terminal, and transmitting the traffic to the second user terminal by the base station.

Prior to transmitting to the base station,

Further comprising the step of the local gateway receiving a connection notification of the second user terminal from the base station,

The method of claim 1,

When the connection notification of the second user terminal is received, the traffic can be transmitted to the second user terminal.

Wherein the step of requesting paging by the base station comprises:

Checking the terminal information mapped with the destination IP address of the traffic by the local gateway, and transmitting a paging request including the terminal information to the base station.

Prior to the step of receiving the traffic,

The local gateway receiving the terminal information from the registered base station of the location of the user terminal located in the intra-company network, and mapping and storing the IP address of each of the terminal information and the user terminal have.

After the storing,

Further comprising the step of receiving the changed location information of the user terminal from the newly connected base station as the user terminal moves and updating the location information of the user terminal,

Wherein the requesting of paging comprises:

The paging can be requested to the base station in which the location of the user terminal is registered.

According to another aspect of the present invention, there is provided a communication system including a base station connected to a user terminal located in a private network and transmitting and receiving traffic, and a base station connected to the private network and the base station, And if the data call traffic is determined to be the data call traffic, the local gateway offloads the traffic to the internal network.

The local gateway comprises:

Classifies the type of the received traffic on the basis of a QoS class identifier (QCI) assigned to the bearer of the traffic, and offloads the traffic to the on-premise network when it is determined as the data call traffic, If it is determined that the traffic is traffic, the traffic can be delivered to the external network.

The local gateway comprises:

If the user terminal is a corporate subscriber, the data call traffic is offloaded to the internal network, and if the user terminal is not a corporate subscriber, all traffic can be transmitted to the external network.

Further comprising a mobility management entity requesting paging to the user terminal in response to a request from the base station,

The local gateway comprises:

Requesting the base station to perform paging when traffic of the user terminal is received in the intra-company network, transmitting the traffic to the base station when the user terminal and the base station are connected,

The base station comprises:

A paging request received from the local gateway is transmitted to the mobility management entity, and when the paging response is received from the user terminal and connected to the user terminal, the traffic may be received from the local gateway and forwarded to the user terminal.

The local gateway comprises:

Receiving the terminal information of the user terminal from the registered base station, mapping the location of the user terminal located in the intra-company network with the IP address of the user terminal, storing the received information, The base station can confirm the terminal information and transmit a paging request including the terminal information to the base station.

The local gateway comprises:

The user terminal moves and updates the location information of the user terminal by receiving the changed location information of the user terminal from the newly registered base station, and when receiving the traffic, requests the paging to the base station registered with the location of the user terminal .

The base station comprises:

A core unit connected to the external network, a digital unit connected to the local gateway, and a digital unit physically separated from the digital unit, the digital unit being installed in a service area, converting and amplifying a wireless digital signal received from the digital unit, And a plurality of wireless units connected to the terminal to transmit and receive traffic.

The plurality of wireless units comprising:

The macrocells can be arranged in the macrocell regions and can use the high power to control the macrocells.

The plurality of wireless units comprising:

The femtocell may be installed in the femtocell region and use the power of the small output to control the femtocell.

The local gateway comprises:

And can be mounted on the digital unit.

According to the embodiment of the present invention, it is possible to provide an enterprise security maintenance foundation through connection support of an intranet in the enterprise.

In addition, it can reduce traffic delay and reduce EPC (core) load by offloading base station traffic.

In addition, service quality can be maintained by supporting handover of voice service.

1 shows a configuration of a communication system according to an embodiment of the present invention.
2 is a flowchart illustrating a traffic offloading method according to an embodiment of the present invention.
3 is a flowchart illustrating a traffic call control method according to an embodiment of the present invention.
4 is a flowchart illustrating a terminal location registration process in a home network according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the terms of " part ", "... module" in the description mean units for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

Hereinafter, a traffic offloading method, a traffic call control method, and a communication system according to embodiments of the present invention will be described in detail with reference to the drawings.

1 shows a configuration of a communication system according to an embodiment of the present invention.

Referring to FIG. 1, a communication system includes a user terminal 100, a plurality of radio units (RU) 200, a digital unit (DU) 300, a local gateway 400 and an in-house network 500. A virtual private network (VPN) gateway 600, a switch 700, a DU concentration center 800, a mobility management entity (MME) 900, a home location register (HLR) 1000 A Serving Gateway (S-GW) 1100, and a packet gateway (P-GW)

Here, the VPN gateway 600, the switch 700, and the DU Concentration Center 800 can be installed in the DU Concentrator built by the communication service provider itself. In addition, the MME 900, the HLR 1000, the S-GW 1100, and the P-GW 1200 can be installed in the exchange office.

The user terminal 100 may be located in a corporate network and may include a wired terminal such as a PC and a portable terminal such as a smart phone or a tablet PC.

A plurality of radio units 200 and digital units 300 may be implemented as one base station (eNodeB). This one base station (eNodeB) includes a processing unit corresponding to each of the radio unit 200 and the digital unit 300 in one physical system, and one physical system is installed in the service area.

A plurality of radio units 200 are physically separated from the digital unit 300 as a part corresponding to a radio base station processing a radio signal, and are installed in a service area, that is, a cell site. The plurality of radio units 200 convert a digital signal received from the digital unit 300 into a radio frequency (RF) signal according to a frequency band and amplify the digital signal. A plurality of wireless units (200) are connected to one digital unit (300). The plurality of radio units 200 and the digital units 300 may be connected by optical cables.

At this time, the plurality of wireless units 200 are installed in the macro cell area, and can use the high output power to control the macro cell. In addition, the plurality of radio units 200 can be installed in the femtocell region and manage the femtocell using the power of the small output power. Here, femtocell means a cell that can cover a very small range in a cellular system.

The digital unit 300 is connected to a core system connected to an external network and a local gateway 400 to perform processing such as encryption and decryption of a wireless digital signal. And transmits and receives signals to and from the plurality of radio signal processing apparatuses 100. [

The digital unit 300 may be implemented as a virtual server in which each digital unit 300 for processing a signal received from the wireless unit 200 is mounted on a virtual platform basis. In this case, each of the digital units 300 can be implemented in the form of loading each software, that is, LTE software, HSPA + software, and WiMAX software on an open hardware platform.

Here, the in-house network 500 refers to a network such as an intranet. And the external network means a network such as the Internet (Internet) 1300.

The local gateway 400 is connected to the digital unit 300 and the internal network 500 and includes the functions of an internal office exchange. It can also perform IP Termination, NAT, and Paging functions.

The local gateway 400 determines whether the traffic transmitted by the user terminal 100 is a data call traffic, and if the traffic is determined to be a data call traffic, the local gateway 400 offloads the traffic to the internal network 500. Here, the in-house network 500 can be constructed in the form of an intranet system, and the offloaded traffic can be blocked. That is, the in-house network 500 may provide a service for blocking data service use.

The local gateway 400 can classify the types of traffic based on a QoS class identifier (QCI) assigned to a bearer of traffic transmitted by the user terminal 100. Table 1 shows the traffic types by QoS class identifier.

QoS class identifier Traffic type QCI 5 Signaling traffic for voice call processing (call call traffic) QCI 1 and QCI 2 User data for voice / video call processing
(Call call traffic) QCI 6/7 Data call traffic

The local gateway 400 distinguishes the traffic type and then offloads the traffic to the internal network 500 when it is determined that the traffic is data call traffic. On the other hand, if it is determined that the traffic is traffic other than data call traffic, that is, call call traffic, it is transmitted to the external network through the core system or the core system.

In this case, if the user terminal 100 that transmitted the traffic is a corporate subscriber, the local gateway 400 offloads the data call traffic to the internal network 500. If the user terminal 100 is not a corporate subscriber, To the external network.

Further, the wireless units 200 are different from each other in TAL (Tracking Area Location). Accordingly, when the user terminal 100 moves and the TAL is changed, the location registration is performed in the corresponding wireless unit 200. When the user terminal 100 moves, the local gateway 400 manages the location registration of the terminal by tracking the location of the base station or the wireless unit 200 accessed by the user terminal 100. That is, the user terminal 100 moves and updates the location information of the user terminal 100 by receiving the changed location information of the user terminal 100 from the base stations 200 and 300 newly registered.

The local gateway 400 receives the terminal information of the user terminal 100 from the base stations 200 and 300 where the location of the user terminal located in the in-house network 500 is registered and maps the terminal information to the IP address of the user terminal 100 . When traffic is received from the in-house network 500, the base station 200 transmits the paging request including the terminal information to the base stations 200 and 300 by confirming the terminal information mapped with the incoming IP address of the traffic. At this time, the terminal information may be temporary (IMSI). Local gateway 400 When traffic is received from the user terminal 100 on the in-house network 500, the user terminal 100 requests paging from the base stations 200 and 300 registered by the user terminal 100, When connected, it transmits traffic to the base station.

This local gateway 400 may be implemented separately from the digital unit 300, but may also be mounted on the digital unit 300. [

The VPN gateway 600 is connected to the digital unit 600 through a VPN tunnel to transmit and receive encrypted traffic.

The SW 700 aggregates traffic from a plurality of DUs in the central station and links them to EPCs.

DU Central Station (800) is a centralized location for DUs that accommodate operators' general subscriber traffic.

The MME 900 includes a non-access signaling (NAS), a NAS signaling security, a mobility management of the user terminal 100, a location related to an idle mode UE, Authentication, bearer management, and the like.

The HLR 1000 manages subscriber information and location information of the user terminal 100.

The S-GW 1100 acts as a mobile anchor when the user terminal 100 moves between handover of the base stations 200 and 300 or between 3GPP radio networks.

The P-GW 1200 allocates an IP (Internet Protocol) address of the user terminal 100, performs packet data related functions of the core network, and acts as a mobile anchor when moving between a 3GPP wireless network and a non-3GPP wireless network do.

FIG. 2 is a flowchart illustrating a traffic offloading method according to an embodiment of the present invention, and illustrates the operation of the local gateway 400. Referring to FIG.

Referring to FIG. 2, when the packet transmitted from the user terminal 100 is received (S101), the local gateway 400 determines whether the user terminal 100 is a corporate subscriber (S103). At this time, the subscriber profile (SPID) of the user terminal 100 can be confirmed. This subscriber profile (SPID) is stored in the HLR 1000 and can be obtained from the MME 900. If the subscriber profile (SPID) is a specific value, the local gateway 400 can determine that it is an enterprise subscriber.

In step S103, the local gateway 400 determines the traffic type based on the QOS class identifier (QCI) assigned to the bearer to which the packet is transmitted (S105). At this time, when the local gateway 400 confirms a set signaling radio bearer (SRB) with the user terminal 100, it can know the allocated QCI. That is, when a packet is received, the QCI allocated to the radio bearer in which the packet is transmitted can be known. Here, as an example, QCI information is received in the form of "QCI #n " as shown in Table 1, where n denotes an arbitrary integer.

As described in Table 1, the local gateway 400 determines whether the received traffic is a data call traffic or a call call traffic (S107).

If the local gateway 400 determines that the call is data call traffic, the local gateway 400 offloads the traffic received in step S101 to the internal network 500 (S109).

On the other hand, if it is determined that the call is a call traffic, the local gateway 400 transmits the traffic received in step S101 to the external network 1300 (S111).

3 is a flowchart illustrating a traffic call control method according to an embodiment of the present invention.

Referring to FIG. 3, the user terminal 100 located in the in-house network registers the location with the MME 900 (S201). Then, the MME 900 transmits the IMSI information of the user terminal 100 to the base station 300 connected to the user terminal (S203).

The base station 300 transmits the IMSI information received from the MME 900 to the local gateway 400 (S205). Then, the local gateway 400 maps the received IMSI information to the IP address of the user terminal 100 (S207) and stores the same.

Thereafter, the local gateway 400 confirms the IMSI information mapped to the incoming IP address of the traffic (S209), and requests paging to the base station 300 using the confirmed IMSI (S211).

Then, the base station 300 transmits the paging request received in step S211 to the MME 900 (S213).

The MME 900 requests paging to the corresponding user terminal 100 (S215). At this time, the paging is performed using the S-TMSI of the subscriber corresponding to the IMSI. When the paging response is received, the paging procedure is successfully completed, and the user terminal 100 is connected to the base stations 200 and 300 (S217).

The base station 300 transmits a terminal connection notification using the IMSI to the local gateway 400 (S219). Then, the local gateway 400 transmits the traffic received from the in-house network 500 to the base station 300 (S221). Then, the base stations 200 and 300 transmit the received traffic to the user terminal 100 (S223).

4 is a flowchart illustrating a terminal location registration process in a home network according to an embodiment of the present invention.

Referring to FIG. 4, when the location of the user terminal 100 is changed (S303) in a state where the user terminal 100 is connected to the base station (RU) 1 (200) (S301), the location registration is requested to the base station (RU) (S305).

The base station (RU) 2 200 transmits a location registration request of the user terminal 100 to the base station (DU) 300 (S307).

The base station (DU) 300 confirms the location information of the user terminal 100 (S309). And requests the local gateway 400 to update the location (S311).

The local gateway 400 updates the location information received in step S311 (S313).

Then, based on the updated location information, the mobile terminal 100 transmits / receives traffic with the user terminal 100 as a called user to / from the user terminal 100 through the base stations 200 and 300 (S315, S317, and S319).

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

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, It belongs to the scope of right.

Claims (22)

A method for offloading traffic from a local gateway connected between a private network and a base station,
Determining whether a traffic transmitted by a user terminal located in the intra-company network and connected to the base station is a data call traffic, and
And if the data call traffic is determined to be the data call traffic, offloading the traffic to the intra-
Lt; / RTI > The method according to claim 1,
After the determining,
If it is not the data call traffic, transmitting the traffic to the external network through the base station
Lt; / RTI > 3. The method of claim 2,
Wherein the determining step comprises:
And determining whether the traffic call is the data call traffic by classifying the type of the received traffic based on a QoS class identifier (QCI) assigned to a bearer of the traffic. The method of claim 3,
Before the determining step,
Checking subscriber information of the user terminal to determine whether the subscriber is a corporate subscriber, and
Transmitting the traffic to the external network if the external subscriber is not the enterprise subscriber,
Wherein the determining step comprises:
And determining whether the data call traffic is the data call traffic if the business subscriber is the subscriber. 5. The method of claim 4,
The method of claim 1,
And determining whether the subscriber profile is a corporate subscriber based on a subscriber profile ID (SPID) of the user terminal. There is provided a method for controlling a traffic arrival in the intra-company network by a local gateway connected between a private network and a base station,
Receiving traffic from a first user terminal located in the intra-company network,
Requesting paging to a second user terminal located in the in-house network, which is the destination of the traffic,
When the paging procedure with the second user terminal is completed, receiving the traffic to the second user terminal
Gt; a < / RTI > The method according to claim 6,
Wherein the step of requesting the second user terminal for paging comprises:
The local gateway requesting paging to the base station,
Requesting paging of the second user terminal from the base station to a mobility management entity that manages mobility of the user terminal,
The mobility management entity requesting paging to the second user terminal, and
When the paging response is received from the second user terminal, the base station and the second user terminal are connected to each other to successfully complete the paging procedure
Gt; a < / RTI > 8. The method of claim 7,
The receiving step comprises:
The local gateway transmitting the traffic to a base station connected to the second user terminal, and
The base station transmitting traffic to the second user terminal
Gt; a < / RTI > 9. The method of claim 8,
Prior to transmitting to the base station,
Further comprising the step of the local gateway receiving a connection notification of the second user terminal from the base station,
The method of claim 1,
And transmitting the traffic to the second user terminal when the connection notification of the second user terminal is received. 8. The method of claim 7,
Wherein the step of requesting paging by the base station comprises:
The local gateway verifying the terminal information mapped with the destination IP address of the traffic, and
Transmitting a paging request including the terminal information to the base station
Gt; a < / RTI > 11. The method of claim 10,
Prior to the step of receiving the traffic,
Receiving, by the local gateway, the terminal information from a registered base station of a location of a user terminal located in the internal network; and
Mapping and storing the terminal information and the IP address of each user terminal
Further comprising the steps of: 12. The method of claim 11,
After the storing,
Further comprising the step of receiving the changed location information of the user terminal from the newly connected base station as the user terminal moves and updating the location information of the user terminal,
Wherein the requesting of paging comprises:
And requesting the paging to the base station in which the location of the user terminal is registered. A base station connected to a user terminal located in a private network to transmit and receive traffic, and
A local gateway connected to the intra-company network and the base station, for determining whether the traffic transmitted by the user terminal is a data call traffic and if the data call traffic is determined to be the data call traffic,
≪ / RTI > 14. The method of claim 13,
The local gateway comprises:
Classifies the type of the received traffic on the basis of a QoS class identifier (QCI) assigned to the bearer of the traffic, and offloads the traffic to the on-premise network when it is determined as the data call traffic, And transmits the traffic to the external network when it is determined that the traffic is traffic. 15. The method of claim 14,
The local gateway comprises:
And offloading the data call traffic to the internal network when the user terminal is a corporate subscriber and transmitting all traffic to the external network when the user terminal is not a corporate subscriber. 14. The method of claim 13,
Further comprising a mobility management entity requesting paging to the user terminal in response to a request from the base station,
The local gateway comprises:
Requesting the base station to perform paging when traffic of the user terminal is received in the intra-company network, transmitting the traffic to the base station when the user terminal and the base station are connected,
The base station comprises:
A paging request received from the local gateway is transmitted to the mobility management entity, and when the paging response is received from the user terminal and connected to the user terminal, the traffic is received from the local gateway and is received to the user terminal. 17. The method of claim 16,
The local gateway comprises:
Receiving the terminal information of the user terminal from the registered base station, mapping the location of the user terminal located in the intra-company network with the IP address of the user terminal, storing the received information, And transmits a paging request including the terminal information to the base station by confirming the terminal information. 18. The method of claim 17,
The local gateway comprises:
Receiving the changed location information of the user terminal from the base station to which the user terminal has moved and newly registered, updating the location information of the user terminal, and if the traffic is received, Lt; / RTI > 14. The method of claim 13,
The base station comprises:
A core system connected to an external network, a digital unit connected to the local gateway, and
A plurality of wireless units installed in a service area and physically separated from the digital unit, for converting and amplifying a wireless digital signal received from the digital unit, and connected to the user terminal to transmit and receive traffic,
≪ / RTI > 20. The method of claim 19,
The plurality of wireless units comprising:
And each of the macrocells is arranged in a macro cell region and uses the high power to control the macrocell. 20. The method of claim 19,
The plurality of wireless units comprising:
And the femtocell is installed in each of the femtocell regions and controls the femtocell by using power of a small output. 20. The method of claim 19,
The local gateway comprises:
And a communication system mounted on the digital unit.

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