WO2016080612A1 - Interoffice telephone system using leg in lte radio resource release state and interoffice telephone method - Google Patents

Abstract

Disclosed are an interoffice telephone system using LTE (long term evolution) Enterprise Gateway (LEG) in an LTE radio resource release state and an interoffice telephone method. An interoffice telephone system, according to the present invention, comprises: an ultra-small base station for mediating, when connected to an LTE terminal registered in an interoffice network, packet communication of the interoffice network between the LTE terminal and an LEG and for transmitting, when radio resource connection is released, a paging request to the LTE terminal; and an LEG for setting a number, with respect to the ultra-small base station, for an LTE terminal which has been authenticated through the interoffice network, mediating number connection among interoffice terminals through the ultra-small base station, determining, for the determined interoffice network communication, whether or not the radio resource connection is to be released, requesting paging to the LTE terminal with respect to the determined connection release by using paging-related information of pre-stored LTE terminal, thereby providing interoffice network-based packet communication. The present invention performs paging, when radio resource is released, with respect to the LTE terminal, thereby providing interoffice network communication service among interoffice terminals for free of charge.

Description

Internal telephone system and internal telephone method using LEG in LTE radio resource released state

The present invention relates to an internal network communication service in an LTE environment, and more particularly, an internal telephone system and an internal telephone method for providing an internal network-based packet communication service by performing paging to an LTE terminal in a state where an LTE radio resource is released. It is about.

This application claims the priority based on Korean Patent Application No. 10-2014-0160116, filed November 17, 2014, all the contents disclosed in the specification and drawings of those applications are incorporated in this application.

1 is a schematic diagram of a conventional LTE system 100. The packet triggered by the UE 101 is communicated via a public network such as the PDN network 106 or the 3G network 107. Here, if a packet is not transmitted or received for a certain time, the radio resources constituting the LTE environment are released for efficiency. For example, the LTE-UU wireless communication standard, the S1 interface, and the S11 interface are released as radio resources, and the released radio resources are used by other UEs.

2A and 2B are schematic flowcharts in which the LTE system 100 of FIG. 1 provides data communication upon release of radio resources. When releasing radio resources, the S5 interface is maintained (1). When the originating terminal 201 transmits data to the UE 101, the SGW 104 receives a packet from the public network through the PGW 105 based on the S5 interface (②). The SGW 104 informs the MME 103 of the initialization for the reception of the data packet and the establishment of the released S11 interface (③). Then, the MME 103 performs a paging procedure through the eNB 102 (④). When the UE 101 responds to paging, a service request of the UE 101 is triggered to start setting of released radio resources S1, S11, and the like. When the setting is completed, the UE 101 receives a packet buffered in the SGW 104 (⑤).

In the LTE environment, if an equipment such as a local enterprise gateway (LEG) capable of converting a packet to an internal network communication between the eNB and the MME / SGW, the public room is excluded from the packet communication between the internal terminals, and the internal network is removed. Can be used to provide intra-network communication of packets.

Here, packet communication is not a problem in a situation where all radio resources are normally connected. However, if the packet is not communicated for a certain time, the release of radio resources such as LTE-UU, S1, S11 occurs, the service through the SGW 104 and PGW 105 based on the public network 202 is shown in Figure 2a As described above, the MME 103 may perform paging for the UE 101 to transmit the buffered packet. However, the internal network-based LEG service has no way of communicating packets due to the release state of resources.

The present invention has been made under the recognition of the above-described prior art, and provides an LEG for providing in-house data communication using a packet network in an LTE environment to provide a function of an in-house telephone even when a resource release occurs. To provide an in-house telephone method.

Another object of the present invention is to enable the LEG to search for information needed for paging using the IP of the UE when resource release occurs, and to perform paging to a receiving UE using an eNB of the retrieved information.

The internal telephone system using the LEG in the release state of the LTE radio resource according to the present invention for solving the technical problem, when connected to the LTE (Long Term Evolution) terminal registered in the internal network, the mobile communication core network and the internal network gateway Request call establishment of the LTE terminal, mediate an intranet-based packet communication (internal network communication) between the LTE terminal and the internal network gateway, and request paging to the LTE terminal when disconnecting radio resources. Micro base station for transmitting the; And when receiving a call setup request of the LTE terminal from the micro base station, using the ID of the requested LTE terminal, authenticating whether to allow the internal network communication, and if the internal network communication is authenticated to the LTE terminal. A call is set up with respect to a base station, and the call connection between the internal terminals is relayed through the micro base station, and upon reception of the packet, it is determined whether or not the internal network communication is the destination address of the requested packet, and the determined internal network communication is performed. An internal network that determines whether the radio resource is disconnected and requests paging to the LTE terminal by using paging related information of the LTE terminal which is stored in advance for the determined disconnection. A gateway (LEG: LTE Enterprise Gateway) is included.

In addition, the intranet telephone system includes an intranet gateway that provides packet communication service between voice terminals or data between intra-company terminals by packet communication with a small base station, wherein the intranet gateway uses the ID of the requested terminal. An internal terminal authentication unit for authenticating with an internal terminal when the terminal is registered as an internal terminal; Upon receiving the call setup request of the LTE terminal from the small base station, the bearer is set by setting session IDs and tunneling IDs of the small base station and the internal network gateway with respect to the LTE terminal authenticated as the in-house terminal from the in-house terminal authentication unit. A call setup unit; A call connection intermediation unit for receiving a call connection request from a calling party's internal terminal and mediating a call connection with a receiving terminal when the call setup is completed; A packet communication mediation unit for mediating the requested packet communication when the call connection is completed; A packet distribution unit for distributing a packet through internal network communication when the destination address of the requested packet is an address registered in the internal network and distributing the packet through public network communication when the address is not registered in the internal network; And a paging request unit for requesting paging based on paging related information of the LTE terminal for call establishment when an incoming event of the LTE terminal is generated while the call setup is released.

In the present invention, the internal network gateway, in order to process the paging for the LTE terminal, the paging-related information is stored in advance in the DB when the call is set up, the paging information to refer to the stored paging information It further includes a management unit.

Here, the internal network gateway is an address of an internal network server that provides a private branch exchange (PBX) based communication service to a wired or wireless terminal registered in the internal network with respect to the determined destination address of the packet of the internal network communication. And a local GW interface unit configured to convert the packet and transmit the packet whose address is converted to the internal network server.

In addition, the internal network gateway, when receiving the connection through the micro base station from the LTE terminal, performs call setup, receives a request to register as an internal terminal from the call-set LTE terminal, the telephone number and location of the received LTE terminal LTE terminal registration unit for storing the terminal information including a.

Preferably, the internal network gateway, and receives the information of the internal terminal registered in the DB (Data Base), any one of the terminal of the originating and receiving side is the LTE terminal registered in the DB, the other terminal In the case of any one of a wired terminal, an LTE terminal, and a Voice Over Internet Protocol (VoIP) terminal registered in the DB, authentication is performed through the internal network communication.

Here, the internal network gateway, during the call setup, a function for receiving a call setup connection including the ID of the LTE terminal, the session ID and the tunneling ID of the micro-station from the micro base station; Extracting an IP address from call data and determining whether the internal network communication matches the IP address of the LTE terminal; And if it is determined that the internal network communication, transmits the session ID and the tunneling ID of the internal network gateway to the micro base station to perform a call setup.

In-house telephone method using the LEG in the LTE radio resource release state according to the present invention for solving the technical problem, the intranet gateway that provides a packet communication service of voice or data between the in-house terminals by packet communication with a micro base station In the internal telephone method for performing the steps of, (a) When a call is generated and receives a call setup request of the LTE terminal from the small base station, if the ID is registered as an internal terminal using the ID of the requested terminal Internal network An internal network communication authentication step of authenticating as allowing communication; (b) a call setup step of setting a bearer by setting each session ID and tunneling ID between the micro base station and the internal network gateway for the LTE terminal when authenticated through the internal network communication; (c) a call connection intermediation step of receiving a call connection request from a calling party's internal terminal and mediating a call connection with a receiving terminal when the call setup is completed; (d) a packet communication mediation step of mediating the requested packet communication when the call connection is completed; (e) a packet distribution step of distributing a packet through internal network communication when the destination address of the requested packet is an address registered in the internal network and distributing the packet through public network communication when the address is not registered in the internal network; And (f) a paging request step of requesting paging based on paging related information of the LTE terminal for call setup when an incoming event of the LTE terminal occurs in the state in which the call setup is released.

According to an aspect of the present invention, a call generated between internal terminals including an LTE terminal is connected through an internal network instead of an external mobile communication network, and paging is performed against an LTE terminal that cannot receive data due to release of radio resources. Processing to recover radio resources and transmit data.

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a schematic configuration diagram of a conventional LTE system.

2A and 2B are schematic flowcharts in which the LTE system of FIG. 1 provides public network based data communication upon release of radio resources.

3 is a schematic structural diagram of an in-house telephone system according to an embodiment of the present invention.

4A and 4B are schematic flowcharts of a process in which the LEG of FIG. 3 provides internal network communication.

5A and 5B are schematic flowcharts of a process in which the LEG of FIG. 4 stores related information for paging processing when a resource is released.

6A and 6B are schematic flowcharts of a process of releasing resources in the in-house telephone system of FIG. 3.

FIG. 7 is a schematic flowchart illustrating a process in which inability to perform internal network communication occurs due to resource release in the internal telephone system of FIG. 6.

8A and 8B are schematic flowcharts of an in-house telephone method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

3 is a schematic structural diagram of an in-house telephone system 1 according to an embodiment of the present invention.

In-house telephone system 1 according to an embodiment of the present invention, LTE terminal 100 (hereinafter referred to as UE: User Equipment), micro base station 200 (hereinafter referred to as eNB: evolved Node B), internal network gateway 300 ( LEG: LTE Enterprise Gateway), an internal network 400 (Enterprise Network), a mobile communication core network 500 (EPC: Evolved Packet Core-network) and PDN 600 (packet data network).

The LTE terminal 100 is a device that receives an internal network communication service including voice call and data communication, such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a subscriber station (SS), and the like. It may be called in other terms. The LTE terminal 100 uses a mobile communication network to which an LTE network including an Evolved Universal Terrestrial Radio Access Network (EUTRAN) is linked. In some cases, the LTE terminal 100 may use a mobile communication network in which a WCDMA network including the UTRAN is interworked. For example, conventional mobile phones such as cellular phones, PCS phones, GSM phones, CDMA-2000 phones, WCDMA phones, and the like, and recently used smart phones, tablet PCs, and mobile phones using 4G networks are all LTE terminals 100. Included).

The micro base station 200 (hereinafter referred to as eNB) is a node located in a large radius of a macro cell base station or located outside a macro cell base station to provide a specific communication service with femtocell coverage for a small number of subscribers. to be. Specifically, the micro base station 200 is connected to a mobile communication core network (EPC 500) using a public network such as a digital subscriber line (DSL) and Ethernet installed indoors such as a home or an office. It provides a data communication service to the LTE terminal 100.

The micro base station 200 may be used in various terms such as a micro base station, a pico base station, a ubicell base station, and a 3GPP standard term, such as eNodeB. Thus, in the present invention, the micro base station 200 is a universal Internet. If it is connected to the core network of the mobile communication system through a line to provide a communication service to the LTE terminal 100 (UE), it should be understood that all of them. The eNB 200 provides an internal network communication service in association with the following LEG 300.

The LEG 300 is a gateway that provides the internal network communication service between wired and wireless communication between internal network terminals registered in the internal network 400. The LEG 300 may be implemented as a LE Enterprise Security Gateway (LESG) for security. Here, the internal network communication service provided by the LEG 300 is based on the premise that the LEG 300 has already stored the registration information (eg, a phone number, an IP address, etc.) of the internal terminal in a DB, and the originating or receiving terminal. It is assumed that any one terminal is an LTE terminal registered in the DB, and the other terminal is any one of a wired telephone terminal, an LTE terminal, and a Voip terminal registered in the DB. That is, in the company call of the present invention, both the calling terminal and the receiving terminal should be an internal terminal registered in the DB, and at least one internal terminal for performing the internal call is required to be the LTE terminal 100. Then, the LEG 300 may provide an internal network communication service accompanied with Vo-LTE or mVoip service to the internal LTE terminal 100. Of course, the internal network communication service may be provided free of charge.

Here, the LEG 300 performs a) local call setup, b) local call connection, and c) call relaying functions with respect to the LTE terminal 100 to provide the internal network communication service. Perform sequentially. The call setup is to identify the LTE terminal 100 as a terminal capable of internal calls and to establish a packet communication path. The call connection is a mediation of a call signal through the packet communication path established between the call-set LTE terminal 100 and the counterpart terminal to indicate that a call event has occurred. The call intermediation is to provide a call service by intermediating communication of voice data generated at each in-house terminal when an incoming event occurs at a receiving side by call connection.

In particular, according to the present invention, the LEG 300 provides an in-house network communication service in association with the eNB 200 and restores released resources by performing paging processing of the LTE terminal 100 when releasing resources. In order to restore the released resources, the LEG 300 may configure the configuration of the proxy MME 301, the proxy eNB 302, the proxy SGW 303, the packet distributor (packet distributor) 304, and the local gateway interface 305. Include.

The proxy MME 301 transmits and receives a signaling message of a call setup of the S1-MME with the eNB 200, stores the information of the message in a DB, and allocates a resource for the proxy SGW 303. In addition, the proxy MME 301 may authenticate whether it is an internal network terminal with respect to the UE 100 requesting call setup. If the ID (eg, telephone number, IP address, etc.) of the UE 100 matches information of a pre-registered internal network terminal, the terminal is authenticated as an internal network terminal to receive an internal network communication service.

Here, the proxy eNB 302 transfers the information of the signaling message received from the proxy MME 301 to the MME 501, and serves to interwork signaling with the eNB 200 to the MME 501. In addition, the packet received from the proxy SGW 303 is also transmitted and received to the SGW 502.

The proxy SGW 303 serves to process the user plane function of the eNB 200 and S1-U.

When the packet splitter 304 analyzes a packet transmitted and received through the LEG 300 and delivers the packet to the internal network 400, the packet splitter 304 transmits the packet to the internal network GW interface (Local Break Out). 305), otherwise (for example, the PDN network 600), the proxy eNB 302 transmits to the proxy eNB 302.

Here, the analysis of whether the packet is the internal network communication uses the preset IP of the internal network 400. For example, the internal network IP is preset with a pattern of "192.xx.xx.xx". If the IP address of the destination has a pattern of "192.xx.xx.xx", it is determined as the communication of the internal network 400, and if it is not a pattern of the internal network IP address, it is determined as the communication of the PDN network 600.

On the other hand, a separate DB can be built to determine the local breakout, the built DB stores the information of the local breakout range, the stored information is the IP address band, phone number as identification band information of the internal network 400 It may include a band or an access point name (APN).

The local GW interface 305 serves to change the header information of the packet through the NAT in order to deliver the received packet to the internal network 400, the packet received from the internal network 400 is eNB 200 In order to be delivered normally, the header information of the packet is changed back into a form receivable by the eNB 200.

The internal network 400 is a local network such as a company or home. For example, the internal network 400 may be a local area network (LAN) or the like. This internal network 400 is connected to the external Internet network via Ethernet.

The EPC 500 is a mobile communication core network in an LTE network, and the EPC 500 includes various entities. For example, a serving gateway (SGW) 502 for managing mobility, a PDN gateway (PDN 600) that connects the LTE terminal 100 with an external PDN 600 and provides IP routing and forwarding functions. , PGW) 503, and a control plane entity in EUTRAN, such as a mobility management entity (MME) 501 for managing user authentication and mobility of the LTE terminal 100.

PDN 600 includes the Internet, for example. The Internet is where the various services that exist in the TCP / IP protocol and its upper layers: HyperText Transfer Protocol (HTTP), Telnet, File Transfer Protocol (FTP), Domain Name System (DNS), Simple Mail Transfer Protocol (SMTP), and SNTP. It is a global open computer network structure that provides Simple Network Management Protocol (NFS), Network File Service (NFS), and Network Information Service (NIS).

Meanwhile, the internal telephone system 100 may further include a private branch exchange such as a Private Branch Exchage (PBX) or an Internet Protocol PBX (IP-PBX) that interworks with the LEG 300 to provide an internal network communication service. . For example, when any one of the in-house terminals is a wired telephone terminal, the LEG 300 provides an in-house network communication service to the wired telephone connected through the PBX. And if any one of the terminals in the company terminal is a Voip terminal, LEG (300) provides an internal network communication service to the Voip terminal connected via the IP-PBX.

4A and 4B are schematic flowcharts of a process in which the LEG 300 of FIG. 3 provides in-house network communication.

For convenience of explanation, it is assumed that the originating UE 100 registered in the internal network transmits a call to the receiving internal network terminal.

When the UE 100 originates a call of voice or data, a packet encapsulated with GTP is received by the proxy SGW 303 of the LEG 300 via the eNB 200, and the proxy SGW 303 receives the received packet. Transfer to the packet distributor 304 (①). The packet distributor 304 determines the destination IP to determine whether it is an internal network address.

First, if determined to be an internal network address, the packet distributor 304 forwards the received packet to the local GW interface 305 (2). The local GW interface 305 changes the destination address of the packet so that the received packet is sent to the internal network server 401 (③). Here, the internal network server 401 holds the PBX or IP-PBX to provide call services to internal network terminals. Therefore, the destination address is changed from the IP of the internal network terminal to the IP of the internal network server 401 and processed in the internal network communication.

Next, if it is determined that it is not an internal network address, the packet distributor 304 requests delivery of the packet to the S / P GW 402, and the proxy eNB 302 receives the packet (4). The S / P GW 402 is a gateway providing the functions of the SGW 502 and the PGW 503. The packet transmitted from the proxy eNB 302 is transmitted to the receiving side via the S / P GW 402 through an intermediary of a public network server controlling the PDN network 600 (⑤).

5A and 5B are schematic flowcharts of a process in which the LEG 300 of FIGS. 4A and B stores related information for paging processing when a resource is released.

The LEG 300 is required to store related IP information for the paging process based on signaling information of call setup of packets flowing into the internal network communication.

The UE 100 initiates an attach request to establish a call to the EPC network 500. By attempting to attach the UE 100, the eNB 200 transmits an attach message received from the UE 100 to the LEG 300 (②).

Then, the proxy MME 301 of the LEG 300 receives an Initial UE message, which is an S1-MME signaling message, from the eNB 200. The received message contains parameters necessary for paging such as S-TMSI and TAI. The proxy MME 301 stores the received parameter information in the DB (③), and transmits the corresponding message to the MME 501 through the proxy eNB 302 (④). Here, the proxy MME 303 mediates the call connection with respect to the call set LTE terminal 100 by using the communication path set in the interval between the eNB 200 and the LEG (300).

The MME 501 allocates resource information of the SGW 502 of the EPC network 500 and transmits initial context setup information to the proxy MME 301 (⑤). The proxy MME 301 allocates information of the internal proxy SGW 303 mapped to the corresponding context information (6).

In the signaling process of call setup, the proxy MME 301 may transmit terminal information (eg, terminal IP, telephone number, etc.) and location information (eg, eNB information) from the LTE terminal 100 roaming with respect to at least one eNB 200. ) Can be registered, and it can be authenticated whether it is an internal network terminal.

Thereafter, a communication path is established between the UE 100 and the eNB 200 to define a bearer, and call setup of the mobile communication core network is completed. NAS information is registered with the MME 501 by the established S1 connection. Registration of NAS information is performed through an authentication and security process, which authenticates subscribers between the UE 100 and the MME 501-HSS, and NAS through the NAS Security Setup procedure between the UE 100 and the MME 501. This process configures NAS Security Keys for signaling message communication. Thereafter, the LTE terminal 100 may access the LTE mobile communication network through the EPC 500 to perform data communication.

When the standard-based signaling process is completed, the UE 100 is connected to the EPC network 300 and transmits a packet (⑦). Here, the proxy SGW 303 analyzes the packet received from the UE 100 through the packet distributor 304, and if the analyzed IP address is an internal network address, performs a local network communication by performing a local break out. (⑧) In this process, the local GW interface 305 stores the source IP information of the received packet in the DB through the proxy MME 301 (305). That is, when the LTE resource is valid, the LEG 300 collects IP information of the in-house terminal and stores it in the DB.

Then, if paging is required for incoming call due to the release of the LTE radio resources in the future, the LEG 300 is able to perform paging using the relevant information previously stored in the DB and the source IP of the terminal mapped thereto. The resources released by paging are reset.

6A and 6B are schematic flowcharts of a process of releasing resources in the in-house telephone system 1 of FIG. 3.

Referring to process ①, when the UE 100 receives a data service, it shows a state that the connection to the interface between each node of the LEG 300 and the EPC network 500 is normally connected. In the connection of the EPC network 500, the connections of the RRC, S1, S11, S5 are maintained. In the connection of the LEG 300, bearers such as Radio, S1, and S5 are maintained. After this signaling connection is completed, packets through downlink / uplink are transmitted and received through bearers of S1 and S5 corresponding to radio bearers.

If the packet is not received for more than a few seconds while the LEG 300 provides the internal network service, the eNB 200 releases the LTE radio resource.

Referring to processes ② to ④, a procedure of releasing radio resources is shown in the process of the UE 100 communicating with the internal network 400 and the PDN network 600. For convenience of explanation, it is assumed that the communication between the UE 100 and the internal network server 401. In this case, the packet may be normally transmitted and received, but a case may occur in which a message is not exchanged with each other for a predetermined period of time. Then, the eNB 200 performs a resource release procedure in order to save radio resources. As a result, radio resources such as S1 and S11 are released. Of course, the release procedure is a procedure provided by the 3GPP specification.

Process ⑤ shows a state in which radio resources are released. The TCP / IP connection is maintained between each application of the UE 100 and the internal network server 401, and only the connection between the S5 bearer resource in the EPC network 600 and the local bearer resource in the internal network 400 is maintained.

FIG. 7 is a schematic flowchart of a process in which the in-house network communication is disabled due to resource release in the in-house telephone system 1 of FIGS. 6A and 6B.

When the incoming request of the packet is generated from the internal network server 401 to the UE 100, there is no way for the LEG 300 to transmit the packet to the nNB 200 in the resource-released state. .

Meanwhile, in the above, the process of processing the paging by the MME 103 based on the S5 connection in which resources are maintained in the PDN 600 network has been described with reference to FIGS. 2A and 2B.

8A and 8B are schematic flowcharts of an in-house telephone method according to an embodiment of the present invention.

The LEG 300 according to an embodiment of the present invention processes the destination address of the packet as in the process of the internal network service referring to FIGS. 4A and 4B. As in the process of storing the related information referring to b, the related paging information is stored in the DB for paging processing due to the release of resources from the internal network service, and the resource of the resource as shown in Figs. 6A and 6B. After the release occurs, the following processing is performed.

With the LTE radio network resources released, the S5 bearer between the SGW 502 and the PGW 503 remains intact, and the local bearer between the LEG 300 and the in-house network server 401 remains intact (1). .

When the internal network server 401 sends a message to request the incoming of the packet, the LEG 300 receives the requested message from the internal network server 401. Proxy SGW 303 then receives the message via local GW interface 305 (2). Here, the packet distributor 304 analyzes the destination IP of the packet of the received message to determine whether it is an internal network IP. Here, it is assumed that the destination IP is the IP of the UE 100 registered in the internal network. On the other hand, the process when the destination IP is not an IP registered in the internal network has already been described above with reference to Figs. 4A and 4B.

Upon receiving the message, the proxy SGW 303 determines whether the S1 connection with the eNB 200 is maintained (③). If it is determined that the radio resource S1 is released, the proxy SGW 303 transmits a paging request to the proxy MME 302 with the IP of the UE 100 as the source IP. The proxy MME 302 inquires paging information previously stored in the received source IP from the DB (⑤). Collection of paging information has already been described with reference to FIGS. 5A and 5B. The proxy MME 302 paging the UE 100 through the eNB 200 based on the retrieved paging information. Meanwhile, in the situation in which the radio resource S1 is maintained, it has already been described with reference to FIGS. 4A and 4B.

The UE 100 receives a message of a paging request, initiates a service request, and establishes an S1 connection (⑦). When the S1 connection is established, the UE 100 receives the buffered message data from the proxy SGW 303 (8).

In the above-described embodiment, the term "~ part" is not used as a term meaning a hardware division of the internal telephone system (1). Therefore, a plurality of components may be integrated into one component, or one component may be divided into a plurality of components. In addition, the component may mean a hardware component, but may also mean a component of software. Therefore, it is to be understood that the present invention is not particularly limited by the term "part".

Although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the claims to be described below by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents.

Claims (14)

When connected to a Long Term Evolution (LTE) terminal registered in an internal network, a request is made for a call establishment of the LTE terminal to a mobile communication core network and an internal network gateway, and is based on an internal network between the LTE terminal and the internal network gateway. A small base station for mediating packet communication (internal network communication) and transmitting a paging request to the LTE terminal when the radio resource is disconnected; And When receiving the call setup request of the LTE terminal from the small base station, using the ID of the requested LTE terminal to authenticate whether to allow the internal network communication, and if authenticated to the internal network communication the small base station for the LTE terminal Set up a call, relay the call connection between the internal terminals through the micro base station, determine whether the internal network communication is the destination address of the requested packet when the packet is received, and determine the internal network communication. An internal network gateway that determines whether to disconnect the radio resource and requests paging to the LTE terminal by using paging related information of the LTE terminal stored in advance for the determined disconnection. (LEG: LTE Enterprise Gateway) In-house telephone system comprising a. An in-house telephone system including an in-house network gateway for providing a packet communication service of voice calls or data between in-house terminals by packet communication with a micro base station, The internal network gateway, An in-house terminal authentication unit for authenticating with an in-house terminal when the ID is registered as an in-house terminal by using an ID of the requested terminal; Upon receiving the call setup request of the LTE terminal from the small base station, the bearer is set by setting session IDs and tunneling IDs of the small base station and the internal network gateway with respect to the LTE terminal authenticated as the in-house terminal from the in-house terminal authentication unit. A call setup unit; A call connection intermediation unit for receiving a call connection request from a calling party's internal terminal and mediating a call connection with a receiving terminal when the call setup is completed; A packet communication mediation unit for mediating the requested packet communication when the call connection is completed; A packet distribution unit for distributing a packet through internal network communication when the destination address of the requested packet is an address registered in the internal network and distributing the packet through public network communication when the address is not registered in the internal network; And Paging request unit for requesting paging based on the paging related information of the LTE terminal for call setup, if the incoming event of the LTE terminal occurs when the call setup is released In-house telephone system comprising a. The method according to claim 1 or 2, The internal network gateway, In-house telephone, characterized in that further comprising a paging information management unit for storing the paging-related information in advance in the DB when the call set up of the LTE terminal, and the stored paging-related information for processing the paging for the LTE terminal system. The method according to claim 1 or 2, The internal network gateway, The destination address of the determined internal network communication packet is converted into an address of an internal network server that provides a PBX (Private Branch Exchange) based communication service to a wired or wireless terminal registered in the internal network, and the address is converted. And a local GW interface unit for transmitting a packet to the internal network server. The method according to claim 1 or 2, The internal network gateway, When the connection is received from the LTE terminal through the micro base station, the call setup is performed, the call request is registered as an in-house terminal from the set LTE terminal, and stores the terminal information including the telephone number and location of the received LTE terminal. LTE terminal register In-house telephone system, characterized in that it further comprises. The method according to claim 1 or 2, The internal network gateway, Receives the information of the terminal in the company is stored in the DB (Data Base), any one of the terminal of the calling party and the receiving side is an LTE terminal registered in the DB, the other terminal is a wired terminal registered in the DB, In the case of any of the LTE terminal and Voice Over Internet Protocol (VoIP) terminal, the internal telephone system, characterized in that the authentication by the internal network communication. The method according to claim 1 or 2, The internal network gateway, While performing the call setup A function for receiving a call setup connection including an ID of an LTE terminal, a session ID, and a tunneling ID of an ultra-mini base station from a micro base station; Extracting an IP address from call data and determining whether the internal network communication matches the IP address of the LTE terminal; And If it is determined that the internal network communication, and transmits the session ID and tunneling ID of the internal network gateway to the micro base station to perform a call setup In-house telephone system, characterized in that for executing. An intranet telephone method in which an intranet gateway performing packet communication with an ultra-small base station and providing a packet communication service of voice or data between internal terminals is executed. (a) When a call is generated and receives a call setup request of the LTE terminal from a small base station, the internal network communication authentication that authenticates to allow the internal network communication when the ID is registered as an internal terminal by using the requested terminal ID step; (b) a call setup step of setting a bearer by setting each session ID and tunneling ID between the micro base station and the internal network gateway for the LTE terminal when authenticated through the internal network communication; (c) a call connection intermediation step of receiving a call connection request from a calling party's internal terminal and mediating a call connection with a receiving terminal when the call setup is completed; (d) a packet communication mediation step of mediating the requested packet communication when the call connection is completed; (e) a packet distribution step of distributing a packet through internal network communication when the destination address of the requested packet is an address registered in the internal network and distributing the packet through public network communication when the address is not registered in the internal network; And (f) a paging request step of requesting paging based on paging related information of the LTE terminal to establish a call, when an incoming event of the LTE terminal is generated while the call setup is released; In-house telephone method comprising a. The method of claim 8, The step (b) further includes the step of storing the paging-related information in a DB in advance when the internal network gateway establishes a call of the LTE terminal, The step (f), the internal network gateway further comprises the step of referring to the stored paging-related information for processing the paging for the LTE terminal. The method of claim 8, Step (e), Convert the destination address of the packet of the internal network communication distributed by the internal network gateway to an address of an internal network server that provides a PBX (Private Branch Exchange) based communication service to a wired or wireless terminal registered in the internal network; And a local GW interface step of transmitting the address-translated packet to the internal network server. The method of claim 8, Before step (a), The method may further include registering an LTE terminal executed by the gateway, wherein the registering is performed after the LTE terminal accesses a micro base station and establishes a call with a mobile communication core network. A request for call establishment of the LTE terminal is requested through the micro base station, and the LTE terminal is authenticated as a registered in-house terminal, and the session information and the tunneling ID are respectively determined by the micro base station and the intranet gateway for the authenticated LTE terminal. Setting up and setting up a bearer to set up a call; And If the call setup is successful, the internal network gateway registers and stores terminal information including the telephone number and location of the LTE terminal through the micro base station; In-house telephone method comprising a. The method of claim 11, Step (a) is, The internal network gateway is a step of receiving a call setup connection including the ID of the LTE terminal, the session ID and the tunneling ID of the ultra-small base station from the ultra-small base station. The method of claim 10 or 12, In the step (a), since the internal network gateway receives information of the internal terminal in advance and stores it in a DB (Data Base), The internal network gateway is any one of the terminals of the calling party and the receiving party is an LTE terminal registered in the DB, the other terminal is a wired terminal, LTE terminal and Voice Over Internet Protocol (VoIP) terminal registered in the DB In the case of any one of the internal telephone method characterized in that the step of authenticating with the internal network communication. The method of claim 10 or 12, Step (b) is, The internal network gateway transmitting a session ID and a tunneling ID of the internal network gateway to the micro base station to perform call setup.

Images