KR20180075788A - Method for recording a PTT call and an VoLTE call - Google Patents

Abstract

The present invention relates to a packet-switched (PS) call and LTE call recording method. The method for recording PS calls and voice-over LTE (voLTE) calls uses: i) a push-to-talk (PTT) recording method of enabling a PTT system to record voice and image data of PTT calls through the communication of a PTT server connected to a call session control function (CSCF) in accordance with the voice control of a PTT client arranged in an IP multimedia subsystem (IP IMS) linked to a public safety LTE (PS-LTE) of a core network through a cell-based LTE base station (eNB) with respect to the call of an incoming or outgoing user terminal (UE); ii) a VoLTE recording method of using a tap apparatus in an SGi section between a packet data network (PDN) gateway and the CSCF in the LTE network to execute a tapping operation and using a VoLTE recording system through packet mirroring to analyze the corresponding IP packets and record the voice and image data of the VoLTE calls; and iii) a device to device (D2D) recording method of generating errors in the PS-LTE core network, storing the recording files including the voice of the corresponding PTT call between the outgoing and incoming terminals in the PTT user terminals to storage units in the individual user terminals with respect to the PTT call establishing a D2D connection, and transmitting the corresponding recording files to the individual D2D recording systems from the PTT user terminals when the network is recovered and connected to the core network. Accordingly, the incoming and outgoing UE calls can be recorded.

Description

[0001] The present invention relates to a PTT call and an VoLTE call,

The present invention relates to a PTT communication method and a LTE call recording method in an LTE network, and more particularly, to a method for recording a push to talk (PTT) in a PS-LTE (Public Safety-Long Term Evolution) ) A voice over LTE (VoLTE) recording method, a PS-LTE network, iii) a PTT call recording a call of a user terminal (UE) using VoDTE (Device to Device) And a recording method.

In the call recording technology, when a predetermined number of pieces of synthetic data are generated through the operation of transmitting and receiving the voice packet data on the receiving side and the voice packet data on the receiving side of the telephone conversation performed through the IP telephone system Encodes the synthesized data into one GSM (Global System for Mobile communication) data, and stores the encoded data in a recording file.

At this time, in the encoding process, the voice packet data of the first block is distorted due to the characteristics of the GSM codec of GSM data. If such distorted data is continuously connected, noise is generated.

As a related art 1, Patent Recording No. 10-0913818 discloses "a recording apparatus and its recording method provided in an IP telephone system ". A recording apparatus provided in an IP telephone system includes at least one recording file, An encoding processor which encodes the dummy data stored in the voice packet data received from the IP telephone system and encodes the encoded dummy data by removing the portion of the dummy data from the encoded data through the encoding processor, And a recording processing unit for storing the recorded information in a memory as a recording file. The present invention also provides a recording apparatus and a recording method thereof in an IP telephone system. The recording apparatus and the recording method provided in the IP telephone system improves the quality of the GSM encoding method by eliminating noise generated in the encoding process of the recording apparatus without loss of voice packet data.

1B is a block diagram of the recording apparatus of FIG. 1A. FIG. 1C is a block diagram of an IP telephone system having a recording apparatus for performing a recording method of FIG. 1A. FIG. 1A is a block diagram of an IP telephone system having a conventional recording apparatus. Is a simple traffic flow diagram of FIG.

1A, an existing communication network is connected to a plurality of IP telephone terminals 100-1 to 100-n and respective IP telephone terminals 100-1 to 100-n to provide a path for telephone communication and data communication A public switched telephone network (PSTN) 500 for providing a public switched telephone network, and a mobile communication network 600 for providing a public switched telephone network, a recording apparatus 300 for performing a recording method in cooperation with the switching apparatus 200, And an exchange 400 connected to the plurality of telephone terminals 10 and 20 and the IP telephone terminals 100-1 to 100-n to provide telephone services.

The switch 400 is implemented by a known IP-based Internet Protocol-Private Branch Exchange (IP-PBX), and the switching device 200 is implemented by a known switching hub.

The IP telephone terminals 100-1 to 100-n are connected to the public telephone terminal 10 of the public telephone network of the PSTN 500 and the mobile communication terminal 600 of the mobile communication network 600, And can make a telephone call with the terminal 20.

The switching device 200 provides a path for data communication including a telephone call through a communication line connected to the exchange 400 and a plurality of IP telephone terminals 100-1 to 100-n, and the IP telephone terminal 100- 1 to 100-n) to the recording apparatus 300 so that the telephone conversations of the telephone conversations are recorded.

1B, the recording apparatus 300 includes an encoding processor 310 for receiving and encoding voice packet data of a telephone call from the switching device 200, a recording processor 310 for storing the encoded data as a recording file, (320), and a memory (330) for storing at least one recording file.

The encoding processor 310 includes an audio synthesizer 311 for synthesizing received voice packet data and generating a predetermined number of pieces of combined data, a determination unit 310 for determining whether the current operation is the first encoding operation of the telephone conversation And an encoding unit 313 that encodes data generated according to a result of the determination unit 312 and includes any dummy data.

The recording processor 320 includes an elimination unit 321 for removing the encoded portion of the dummy data from the encoded data and a recording unit 330 for recording the encoded data of the encoded data or the dummy data, As shown in FIG.

The speech synthesizing unit 311 receives the voice packet data of the calling side 101 and the voice packet data of the receiving side 102 from the switching device 200 and combines them to generate a predetermined number of pieces of combined data.

At least one of the calling side 101 and the receiving side 102 corresponds to the IP telephone terminals 100-1 to 100-n and the rest corresponds to the IP telephone terminals 100-1 to 100-n, (10) and the mobile communication terminal (20).

When the predetermined number of pieces of combined data is generated by the speech synthesis unit 311, the determination unit 312 determines whether the current operation is the first encoding operation according to the presence or absence of the previously encoded data.

The determination unit 312 determines whether the current operation is the first encoding operation of the telephone call according to the presence or absence of the recording file corresponding to the telephone conversation using the specific flag indicating the encoding or recording operation information ≪ / RTI >

The encoding unit 313 encodes the predetermined number of pieces of combined data M1, M2, and M3 generated by the speech synthesizing unit 311 when the determination unit 312 determines that the current operation is the first encoding operation And encodes it into one GSM data 1a.

If the determination unit 312 determines that the current operation is not the first encoding operation, the encoding unit 313 outputs the predetermined number of pieces of combined data M4, M5, and M6 (M7, M8, and M9) (I.e., dummy data M3 and respective composite data M4, M5, and M6 are sequentially combined and encoded) by including the corresponding dummy data (e.g., M3 and M6) .

At this time, the dummy data is implemented with the last composite data M3 and M6 of the composite data used in the previous encoding operation according to the embodiment, but it is not limited to this and is implemented with specific data of predetermined size.

When the encoding unit 313 encodes the predetermined number (three) of synthesized data as it is, 260 bytes of GSM data are output. When dummy data (e.g., M3) (320 samples) are combined and encoded, 325 bytes of GSM data .

The removal unit 321 of the recording processor 320 removes the encoded portion of the corresponding dummy data from the GSM data encoded by the encoding unit 313. [

Since the dummy data is located at the foremost part of the other composite data, the removal unit 321 deletes the encoded size of the corresponding dummy data (the dummy data of the sample is encoded Size 65 bytes) is removed.

The storage unit 322 stores the GSM data (260 bytes) in which each composite data is directly encoded by the encoding unit 313 or the data (260 bytes) in which a predetermined portion is removed (65 bytes are removed) by the removal unit 321 And stores the recording file of the telephone conversation in the memory 330.

As related art 2, Patent Publication No. 10-2006-0068876 discloses an apparatus, a method, and a system for recording call history including an index in a network supporting Voice over Internet Protocol (VoIP). The receiving side media data packet or the receiving side media data packet is temporarily stored in the recording apparatus, and when the recording start control signal from the receiving terminal is received, the transmitting side media data and the receiving side media data temporarily mixed are mixed, When the index insertion control signal is received, a predetermined index is added to a predetermined point of the media data being mixed, and mixing is performed. When the recording end control signal is received in the recording device, the mixing is terminated. By inserting an index at a predetermined point of the audio or video call history data, a part to be searched can be quickly searched, the searched part can be immediately reproduced, and only data between a plurality of searched indices can be extracted.

FIG. 2A is a configuration diagram of a conventional call detail recording system, and FIG. 2B is a block diagram illustrating an internal configuration of a call detail recording apparatus.

Referring to FIG. 2A, a calling terminal 110 requests a call connection with a specific receiving terminal to a switching center 130 through a predetermined communication network 120, and exchanges a call with a connected receiving terminal 150.

The communication network 120 plays a role of connecting communication between the calling terminal 110 and the exchange 130. To this end, a dedicated line network such as E1 and T1, Circuit Switched Networks (CSN) such as a public switched telephone network (PSTN) ISDN, a wireless network, etc. may be used.

When the calling terminal 110 requests the specific receiving terminal 150 to make a call connection, the switching center 130 plays a role of connecting a call with the corresponding receiving terminal 150 and transmits a signal from the communication network 120 to the VoIP network 140) or vice versa. Therefore, each of the receiving terminals 150 connected to the switching center 130 has a unique IP address, and the switching center 130 is provided with a predetermined number of digits for matching the IP address of each receiving terminal with a predetermined digit number (telephone number) And receives digit number information for call connection from the calling terminal 110, it searches the corresponding IP address and connects the call to the corresponding receiving terminal 150. The gateway 130 is a concept corresponding to a gateway in a VoIP network. The gateway 130 receives voice data divided into packets from users in the VoIP network and transmits voice data to other parts of the intranet or a T1 or E1 interface To the PSTN.

The receiving terminal 150 exchanges calls with the calling terminal 110 through the switching center 130 and transmits various recording related control signals to the recording apparatus 160. The recording related control signal includes a recording start control signal, a recording end control signal and an index insertion signal, and further includes a recording pause control signal, a recording cancel control signal, and an index removal control signal.

The receiving terminal 150 may be provided with a predetermined selecting means and a recording signal generating module for allowing a receiver to arbitrarily generate a recording related control signal.

That is, when the receiving terminal 150 has a structure composed of a telephone terminal and a predetermined service server, if the service server invites the telephone terminal to list various functions related to the recording in the voice guidance system and recommends to select one of them, A specific digit input button (telephone number input button) matched with a desired function is generated to generate a control signal for the corresponding function. In this case, the digit input button becomes the predetermined selection means.

Referring to FIG. 2B, the recording apparatus 160 includes a packet processing unit 210, a mixer unit 220, and a storage unit 230. The packet processing unit 210 includes a packet capturing module 211 for capturing packets of source media data, destination media data, and various control signals, and a predetermined header if the captured packet is a media data packet or a recording related control signal packet And a control module 212 for transmitting the control signal to each of the mixer units and performing a predetermined control corresponding to the other control signal packets.

The control module 212 uses proprietary protocols for each H.323, SIP, or network equipment manufacturer to implement a VoIP (Voice over IP) network.

When the recording start control signal is transmitted from the control module 212, the mixer unit 220 starts mixing the temporarily stored source side and receiving side media data to generate recording media data, and during the mixing, And a data mixing module 221 for performing mixing by attaching a predetermined index to a predetermined point when it is delivered, and terminating the data mixing when a recording end control signal is transmitted. Preferably, the data mixing module 221, And a codec conversion module 222 for converting the media data into PCM (Pulse Code Modulation), transmitting the data to the data mixing module 221, and converting the PCM data mixed in the data mixing module 221 into a preset codec do.

When the media data is audio data using Session Initiation Protocol (SIP) in particular, the codec conversion module 222 converts the codec applied to the source and destination media data before mixing, the PCM codec, and the G.711, G. 723, G.728, and G.729 codecs. H.323 specifies an audio codec in the range of 5.3 to 64 kbit / s and basically specifies that G.711 is used as PCM. However, since G.711 is a codec designed to be used in PTSN public telephone network, it is relatively inadequate for communication on the Internet with a smaller subscriber bandwidth, and therefore, most H.323 terminals have good quality at 5.3 kbit / s and 6.3 kbit / s Use G.723.1 to provide sound quality or G.728 and G.729 to provide high sound quality at 16kbit / s and 8kbit / s, respectively.

2C is a signal flow diagram of a call history recording method using the call detail recording system of 2a.

When the calling terminal transmits predetermined digit information to the switching center and requests a call connection to a specific receiving terminal, the switching center connects the call to a receiving terminal having an IP address matched with the transmitted digit information.

When a call is connected between the calling terminal and the receiving terminal, digitized call history data is generated according to the call initiation of the caller or the receiver, and this can be audio data or video data. Since the generated media data exists in the form of packets in the VoIP network, when the packets of the source or destination media data arrive at the packet capturing module of the recording apparatus, a predetermined header for supporting VoIP Extracts only pure media data, and temporarily stores it in the storage unit. At this time, the calling side media data and the receiving side media data are separately accessed by the recording apparatus, and temporary storage is also performed separately.

If a predetermined selection means is selected in the receiving terminal or a predetermined scenario module is executed to generate a recording start control signal and is captured by the packet capture module of the recording apparatus and then determined to be a recording start control signal in the control module, The mixing module is executed to start mixing of the temporarily stored sender side and receiving side media data. When receiving the index insertion control signal from the receiving terminal again, a predetermined index is inserted at a specific point of the media data being mixed.

The source and destination media data temporarily stored in the recording apparatus are coded according to the codec types supported by the VoIP network. That is, if the media data is audio data, it is coded according to one of G.711, G.723, G.728, and G.729. If the media data is video data, it is encoded according to any one of H.261 / QCIF or H.263 Lt; / RTI > It is assumed that the media data is audio data. A predetermined conversion means is provided in the middle so that the media data input from the VoIP network is mixed regardless of which codec is coded and then converted into a specific codec desired by the user and stored uniformly. That is, when the media data to be mixed is audio data, the sender and receiver media data are uniformly converted into a PCM (Pulse Coded Modulation) code and mixed, and then the mixed and merged PCM file is re- Codec. In order to perform such a role, the mixer unit of the recording apparatus further includes a codec conversion module. The specific codec set in the codec conversion module is set according to a predetermined policy determined in consideration of the storage quality, storage capacity, and other conditions. If the codec is not used and the codec supported in the original VoIP network is used as it is, The codec conversion module need not be separately provided.

When the index insertion control signal arrives, a predetermined index is inserted into the media data being mixed and mixed. Such an index can be implemented in two types. First, a predetermined code among the codes allowed by the user codec applied to the first mixed media data is used as an index, or a code having a predefined data structure is used as an index do.

However, as the base station, the base station controller, and the network elements change as the mobile communication network is developed into the GSM-> W-CDMA-> LTE network, a new recording method becomes necessary. Accordingly, in the PS-LTE network, Ii) a VoLTE recording method for recording voice and image data of a VoLTE call by analyzing a corresponding packet using a VoLTE recording system by tapping the SGi interval between the PDN gateway and the CSCF in the LTE network; Iii) a method of recording D2D was required.

Patent Registration No. 10-0913818 (Date of Registration Aug. 18, 2009), "Recording Apparatus and Method for Recording in IP Telephone System", Seoul Communication Technology Co., Ltd. Patent Publication No. 10-2006-0068876 (filed on June 21, 2006), "Apparatus, method and system for recording call history including index ", ELINISYS Co.,

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the problems of the conventional art by providing a method of controlling a call of an incoming and outgoing user equipment (UE) in an LTE network through a connection network of a cell-based LTE base station (eNB) I) a PTT recording method in which a PTT recording system records voice and video data of a PTT (Push-To-Talk) call through a PTT server provided in an IP IMS interworking with a network, and a PTT recording method between a PDN gateway and a CSCF Ii) VoLTE recording method of recording voice and image data of VoLTE call by analyzing a corresponding packet using VoLTE recording system through packet mirroring by tapping the SGi section of the PS-LTE with a TAP device; The PTT user terminal stores the recording file including the utterance of the corresponding PTT call in the storage in the PTT user terminal for the PTT call when the D2D connection is established, And the PTT user terminal respectively transmits and records the corresponding recording files to the D2D recording system when the connection to the core network is restored, and iii) the PTT phone call recording the call of the called terminal UE using the D2D recording method And VoLTE call recording method.

In order to accomplish the object of the present invention, a PTT call recording method according to a first embodiment of the present invention is a PTT call recording method of a PTT call recording method, comprising: a PTT server connected to an access network of an LTE network and an IP IMS linked to a PS- And a PTT recording system for recording call voice (together with video data in case of a video call) through the PTT server according to the floor control by the PTT client. The PTT recording system comprises (a) a calling terminal among the PTT user terminals and a called terminal Establishing a PTT call connection between the PTT user terminals with the PTT identification number of the PTT user; (b) connecting a PTT server corresponding to a communication channel connected by the PTT client with a PTT (Push-To-Talk) call with the PTT recording system; (c) when the PTT user terminal requests a speech by the floor control, the PTT client sends a call voice (together with image data in case of a video call) to the PTT recording system via the PTT server according to the voice control, Recording and storing the program; And (d) terminating the PTT speech recording of the PTT server and the PTT recording system when the terminal of the PTT user terminal transmits a PTT speech end request to the PTT server.

According to another aspect of the present invention, there is provided a method for recording an LTE call according to another embodiment of the present invention includes: a TAP equipment for tapping an SGi interval between a PDN gateway and a CSCF of an EPC of a core network interworking with an access network in an LTE network; Providing a VoLTE recording system coupled to the TAP equipment; A VoLTE call connection step from the calling terminal VoLTE user terminal to the called terminal VoLTE user terminal via the CSCF; A call data transmission / reception step of transmitting / receiving a call voice (together with video data in case of a video call) of an incoming / outgoing call terminal; Terminating a VoLTE call with the calling terminal (or called terminal) VoLTE user terminal through the CSCF from the calling terminal (or calling terminal) VoLTE user terminal; And a TAP equipment for tapping an SGi interval between the PDN gateway and the CSCF of the EPC in the VoLTE call connection step, the call data transmission / reception step, and the VoLTE call end step, And records the voice and video data of the receiving and receiving terminal.

In order to achieve another object of the present invention, in a D2D recording method according to another embodiment, when a failure occurs in a PS-LTE core network, a calling terminal of a PTT user terminal and a called terminal of a PTT user terminal Switching to an Off-Network when the 'PTT call connection attempt' is not made; A call is made from the calling terminal of the PTT user terminal to the called terminal of the PTT user terminal directly on the off-network, and a 'PTT speaking request' is transmitted from the calling terminal of the PTT user terminal to the called terminal of the PTT user terminal And transmits a 'PTT Talk Response' to the calling terminal of the PTT user terminal directly from the called terminal of the PTT user terminal in response to the PTT user terminal. In response to the PTT call being made in the D2D (Device to Device) And a receiving terminal storing a recording file for a PTT remark of the corresponding call; And when the connection is made to the core network, the calling terminal and the called terminal of the PTT user terminal respectively transmit the corresponding recording file to the D2D recording system and store the recorded recording file.

The PTT call and VoLTE call recording method according to the present invention can be applied to a call of an incoming / outgoing user terminal (UE) through a connection network of a cell-based LTE base station (eNB) A PTT recording method in which a PTT recording system records voice and image data of a PTT (Push-To-Talk) call through communication with a PTT server in accordance with a voice control of the PTT client, and a PTT recording method in a 4G LTE network and a PDN gateway and a CSCF Ii) VoLTE recording method for recording voice and image data of VoLTE call by analyzing corresponding IP packets using VoLTE recording system through packet mirroring by tapping SGI section between PS1 and PS2, And the calling terminal and the called terminal of the PTT user terminal of the PTT call made in connection with the D2D connection have a statement of the corresponding PTT call in the storage in the PTT user terminal When the network is restored and the connection to the core network is established, the calling terminal and the called terminal of the PTT user terminal respectively transmit and record the corresponding recording file to the D2D recording system and iii) use the D2D recording method Thereby recording the call of the incoming / outgoing user terminal UE.

FIG. 1A is a configuration block diagram of an IP telephone system provided with a conventional recording apparatus.
Fig. 1B is a block diagram of the configuration of the recording apparatus 1a.
1C is a simplified traffic flow diagram of an IP telephone system equipped with a recording apparatus for performing a recording method of 1a.
2A is a configuration diagram of a conventional call detail recording system.
FIG. 2B is a block diagram showing an internal configuration of the call history recording apparatus 2a.
2C is a signal flow diagram of a call history recording method using the call detail recording system of 2a.
FIG. 3 is a diagram illustrating a PTT server and a PTT recording system provided in a PS-LTE network between an incoming / outgoing mobile communication terminal according to an embodiment of the present invention.
4 is a service flow diagram illustrating a PTT interface model of a PTT recording system using a PTT server in a PS-LTE network.
5 is a service flowchart illustrating a PTT recording method using a PTT calling terminal (PTT-UE), a PTT server, a PTT recording system, and a PTT receiving terminal (PTT-UE) according to an embodiment of the present invention.
6 is a configuration diagram of a VoLTE recording system for recording voice and image data of a VoLTE call by tapping an SGi interval between a PDN gateway and a CSCF in a LTE network according to another embodiment of the present invention using a TAP device.
7 is a diagram illustrating a VoLTE recording system interface model.
FIG. 8 is a diagram illustrating a VoLTE recording method for recording voice and image data of a VoLTE call using a VoLTE recording system by tapping an SGi section between a PDN gateway and a CSCF in a LTE network according to another embodiment of the present invention using a TAP apparatus It is a service flow diagram.
9 is a configuration diagram illustrating a D2D recording method according to another embodiment of the present invention.
10 is a service flowchart showing the D2D recording method.

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

The PTT call and VoLTE call recording method of the present invention can be applied to a PS-LTE (Public Safety-Long Term Evolution) network i) a push to talk (PTT) recording method, ii) a voice over LTE (VoLTE) recording method, Provides a method to record D2D (Device to Device) when an LTE core network failure occurs.

The PTT recording method is a method in which a PTT recording system transmits a push-to-talk (PTT) message through a communication with a PTT server linked to a PS-LTE network via a CSCF in accordance with a voice control of a PTT client, -Talk Recording voice and video data of a call.

The VoLTE recording method taps the SGi interval between the PDN gateway and the CSCF in the 4G LTE network using the TAP equipment, analyzes the corresponding IP packets using the VoLTE recording system, and records voice and image data of the VoLTE call .

In the D2D recording method, a recording file including a PTT remark of the call between the calling terminal and the called terminal is stored in the storage in the PTT user terminal in response to the PTT call in the D2D connection due to a failure in the PS-LTE core network If the connection to the core network is established again, the calling terminal and the called terminal of the PTT user terminal respectively transmit the corresponding recording file to the D2D recording system and store the recording file.

For reference, LTE network element (NE) is defined as follows. The 4G wireless packet core gateway platform currently supports GGSN for 2.5G and 3G, serving gateway (S-GW) for LTE and packet data Supports Network Gateway (P-GW) to provide seamless, scalable solutions for GPRS / EDGE, HSPA, HSPA + and LTE.

A UE (User Equipment) is called a 'user terminal' and means a user mobile communication terminal. Among the calling terminal and the PTT user terminal, the called terminal 700 provides voice / video call and packet data service.

In the LTE network, a Mobility Management Entity (MME) 720 and a Serving Gateway (S-GW) 740 functioning in cooperation with an LTE base station (eNB) And a PDN gateway (P-GW, PDN gateway) 750 of a packet data network linked to a wired network are used.

An LTE base station (eNB) 710 is a "LTE base station" in a cell unit, and is a base station equipment that provides a wireless connection between a user terminal and an LTE core network.

The serving gateway 740 is interlocked with the mobility management entity 720 in the S11 interface at the time of handover of the LTE base stations 710 and is connected to the LTE base station 710 to serve as an anchor And serves as an anchor point in Intra-LTE mobility).

The PDN gateway 750 is a packet data network gateway that acts as an anchor for the IP address assignment and serving gateways (S-GW) 740 to the user terminal 700 do.

At this time, the user data is communicated to the Internet through the user terminal 700, the LTE base station 710, the serving gateway 740, and the PDN gateway 750. That is, other NEs (for example, MME, PCRF, etc.) do not pass user data.

The Mobility Management Entity (MME) 720 manages the mobility of the UE in cooperation with the cell-based LTE base station (eNB) 710 and is provided in the LTE core network. ), An EPS (Evolved Packet System) bearer, and manages the moving state of the subscriber.

An HSS (Home Subscriber Server) 730 is provided with an LTE service home subscriber database (DB) for performing subscriber management with key information and a subscriber profile for authentication for each user terminal.

Policy and Charging Rule Function (PCRF) 760 is connected to the packet data network gateway (P-GW, PDN Gateway), and defines a policy and a rule for charging for each user terminal Equipment, and applications that provide wired and wireless integrated policy management are implemented.

The Call Session Control Function (CSCF) 770 constitutes a network for providing All-IP service in VoLTE voice communication between the calling terminal and the called terminal, and controls signals and control in the IP IMS (IP Multimedia Subsystem) network It is used as an element for.

The IMS solution includes a CSCF 770 serving as an exchange in a next generation data network, a home subscriber server (HSS) 730 serving as a subscriber management, and an SBC (Session Border Controller) It is used as a key device for call service.

The PTT recording method according to the present invention will be described.

FIG. 3 is a diagram illustrating a PTT server and a PTT recording system provided in a PS-LTE network between an incoming / outgoing PTT user terminal according to an embodiment of the present invention.

The PTT recording method may be applied to the call of the PTT user terminal (PTT UE) 700 in the IP IMS interworking with the PS-LTE network of the core network through the access network of the cell based LTE base station (eNB) Through the communication with the PTT server, the PTT recording system records voice and video data of a PTT (Push-To-Talk) call.

At the time of a call between the calling terminal and the called terminal, the PTT recording system records the voice or image data of the PTT call when the calling party data packet or the receiving party data packet is received according to the floor control through communication with the PTT server And terminates the recording in response to the request to end the speech.

4 is a service flow diagram illustrating a PTT interface model of a PTT recording system using a PTT server in a PS-LTE network.

The PTT server is connected to the CSCF in the IP IMS interworking with the PS-LTE network, and the PTT recording system operates through the PTT server according to the voice control between the PTT clients.

The PTT recording step will be described.

The PTT user terminal is PTT dialed through the PTT user terminal access network and the PS-LTE network with a middle PTT identification number,

When a call connection between the PTT clients is started, a PTT call connection is signaled between the PTT server and the PTT recording system for the call connection,

The PTT user terminal uses a Talk Burst packet to transmit a talk burst packet. The talk burst packet is transmitted to a PTT recording system from a calling or called terminal of a calling or PTT user terminal (floor control)

When the PTT user terminal speaks, the voice (together with the video data Media in case of video call) is transmitted to the PTT recording system via the PTT server,

When the terminal of the PTT user terminal sends a PTT talk termination request to the PTT server, the PTT talk-back recording of the PTT server and the PTT recording system is terminated.

A PTT call recording method according to an exemplary embodiment of the present invention is a PTT call recording method in which a PTT server connected to a CSCF in an IP IMS linked to an access network of an LTE network and a PS-LTE network and a PTT server A PTT recording system for recording call voice (together with video data in case of a video call) is provided,

(a) establishing a PTT call connection between a PTT user terminal and a calling terminal of the calling terminal and a called terminal of the calling terminal; (b) a step (Signaling) a PTT (Push-To-Talk) call connection with the PTT recording system through the PTT server according to a call connection corresponding to a communication channel between the PTT clients; (c) When the PTT user terminal speaks by floor control, the PTT client records the call voice (together with the image data in case of video call) to the PTT recording system through the PTT server according to the voice control of the PTT client ; And (d) terminating the PTT speech recording of the PTT server and the PTT recording system when the speech requesting terminal of the PTT user terminal transmits a PTT speech termination request to the PTT server.

5 is a service flowchart illustrating a PTT recording method using a PTT calling terminal (PTT-UE), a PTT server, a PTT recording system, and a PTT receiving terminal (PTT-UE) according to an embodiment of the present invention.

In the PTT recording method, when the calling terminal attempts to make a call to the PTT identification number of the called terminal among the PTT user terminals in the signaling process, the PTT server attempts to establish a PTT call through the PTT server. The PTT server attempts to connect to the PTT recording system, transmits a PTT recording system connection response from the PTT recording system to the PTT server, and transmits a call connection response from the called terminal to the PTT server of the PTT user terminal Transmitting a call connection response from the PTT server to the calling terminal of the PTT user terminal;

Establishing a connection between the PTT server and the PTT recording system;

When the PTT user terminal sends a PTT speaking request to the PTT server, the PTT server transmits a PTT speaking request response to the calling terminal of the PTT user terminal. When the PTT server transmits a PTT speaking notification to the called terminal of the PTT user terminal Receiving a PTT reminder response from a called terminal of the PTT user terminal to the PTT server, transmitting a PTT reminder notification to the PTT recording system, and receiving a PTT reminder response from the PTT recording system to the PTT server;

When the calling terminal of the PTT user terminal and the called terminal of the PTT user terminal are started, the PTT recording system records voice and image data of a PTT (Push-To-Talk) call through the PTT server according to the voice control of the PTT client ; And

When the PTT user terminal transmits a PTT talk end request to the PTT server, the PTT server transmits a PTT talk end request response to the terminal requesting the talk PTT user terminal, and transmits the PTT talk end request response from the PTT server to the called terminal The PTT server transmits PTT utterance termination notification to the PTT server at the same time and transmits a PTT utterance termination notification from the PTT server to the PTT server, and terminates the PTT utterance voice recording of the PTT server and the PTT recording system.

A VoLTE recording method according to another embodiment of the present invention will be described.

6 is a configuration diagram of a VoLTE recording system for recording voice and image data of a VoLTE call by tapping an SGi interval between a PDN gateway and a CSCF in a LTE network according to another embodiment of the present invention using a TAP device.

In the LTE network, the VoLTE recording system located in the core network taps the SGi interval between the PDN gateway and the CSCF using a TAP device and packet-mirrors the packet to the VoLTE recording system, Video packet) and records VoLTE call voice (together with video data in case of video call).

For reference, voice call service using 4G LTE and 4G Long Term Evolution (3G) LTE networks used LTE for data transmission and 3G network for voice calls until now. Voice over LTE (VoLTE) uses a wide frequency bandwidth and a high-quality audio codec compared to third generation (3G) voice calls. The call connection time is up to 20 times faster than 3G, and can be switched to a video call while sharing a voice call, or share pictures, images and location information. In terms of transferring voice data into IP packet data, it technically provides a service similar to a mobile Internet telephone (mVoIP, mobile VoIP) such as Skype or Boystock.

The calling terminal and the called terminal provide a voice call using the VoLTE solution provided in the LTE network or a voice and video call through the V2oLTE solution (Voice and Video over Long-Term Evolution).

7 is a diagram illustrating a VoLTE recording system interface model.

A TAP equipment for tapping an SGi section between a PDN gateway and a CSCF of an EPC of a mobile communication network core network interworking with an access network in an LTE network and a VoLTE recording system connected to the TAP equipment. The EPC includes a serving gateway and a PDN gateway.

VoLTE recording will be described.

Among the various interfaces, the SGi section is a section through which both signals and voice and image data flow, and is an unencrypted section. Therefore, the data is mirrored, and a tap device is installed in the SGi section between the EPC and the CSCF The VoLTE recording system separates only the VoLTE packet from the mirrored packet, analyzes the signal, voice and image data in the separated VoLTE packet, and records voice and image data.

The LTE call recording method according to another embodiment of the present invention includes: a TAP equipment for tapping an SGi section between a PDN gateway and a CSCF of an EPC of a core network interworking with an access network in an LTE network; and a VoLTE recording system ; A VoLTE call connection step from the calling terminal VoLTE user terminal to the called terminal VoLTE user terminal via the CSCF; A call data transmission / reception step of transmitting / receiving a call voice (together with video data in case of a video call) of an incoming / outgoing call terminal; Terminating a VoLTE call with the calling terminal (or called terminal) VoLTE user terminal through the CSCF from the calling terminal (or calling terminal) VoLTE user terminal; And a TAP equipment for tapping an SGi interval between the PDN gateway and the CSCF of the EPC in the VoLTE call connection step, the call data transmission / reception step, and the VoLTE call end step, And records the voice and video data of the called terminal.

FIG. 8 is a diagram illustrating a VoLTE recording method for recording voice and image data of a VoLTE call using a VoLTE recording system by tapping an SGi section between a PDN gateway and a CSCF in a LTE network according to another embodiment of the present invention using a TAP apparatus It is a service flow diagram.

The VoLTE recording method comprises the steps of (a) transmitting a 'VoLTE call connection attempt' from the calling terminal VoLTE user terminal to the CSCF for signaling, and transmitting a 'VoLTE call connection attempt' from the CSCF to the called terminal VoLTE user terminal, And the 'VoLTE call connection attempt' packet is mirrored to the recording system through the Tap device installed in the SGi interval between the CSCF and the CSCF,

VoLTE call connection response 'is transmitted from the called terminal VoLTE user terminal to the CSCF, and a' VoLTE call connection response 'packet is mirrored through the Tap device installed in the SGi section between the EPC and the CSCF and is transmitted to the recording system. Transmitting a 'VoLTE call connection response' to the VoLTE user terminal;

(b) When a VoLTE call is connected to a calling terminal VoLTE user terminal and a called terminal VoLTE user terminal, a voice recording is started and a calling voice (together with video data in case of a video call) is transmitted and received between the calling terminal and the called terminal. Recording audio and video data of a calling and called party to a VoLTE recording system through packet mirroring (call mirroring) through a Tap device installed in an interval between SGs and CSCFs; And

(c) VoLTE user terminal transmits 'VoLTE call termination attempt' for signaling to the calling terminal (or called terminal), and 'VoLTE call termination attempt' is transmitted from the CSCF to the called terminal (or calling terminal) VoLTE user terminal In this process, a 'VoLTE call termination attempt' packet is mirrored through a Tap device installed between the EPC and the CSCF in the SGi section, and is transmitted to the recording system.

A 'VoLTE call termination response' is transmitted from the VoLTE user terminal to the CSCF, and the 'VoLTE call termination response' packet is mirrored through the Tap device installed in the SGi interval between the EPC and the CSCF and is transmitted to the recording system , And transmitting a 'VoLTE call termination response' from the CSCF to the calling terminal (or called terminal) VoLTE user terminal.

A D2D recording method according to another embodiment of the present invention will be described.

9 is a configuration diagram illustrating a D2D recording method according to another embodiment of the present invention.

In the D2D recording method, when a failure occurs in the PS-LTE core network due to a communication equipment failure in the LTE network, the calling terminal of the PTT user terminal and the called terminal of the calling terminal respond to the PTT call When the communication network is restored and the connection is established to the PS-LTE core network, the PTT user terminal transmits the corresponding recording file to the D2D recording system and stores the recording file.

In the D2D recording, when a failure occurs in the core network in the LTE network, a PTT call is connected through the inter-terminal communication (D2D). When a terminal that makes a PTT remark transmits a PTT remark to the PTT remark When the failure of the core network is resolved, the calling terminal and the called terminal of the PTT user terminal transmit and save the corresponding recording file to the D2D recording system, respectively.

10 is a service flowchart illustrating a D2D recording method according to another embodiment of the present invention.

The D2D recording method in the PS-LTE network according to another embodiment of the present invention is characterized in that (a) a failure occurs in the PS-LTE core network, and the calling terminal of the PTT user terminal and the called terminal of the PTT user terminal, PTT call connection attempt 'is not made, switching to the Off-Network; (b) connecting a call from the calling terminal to the called terminal of the PTT user terminal directly from the calling terminal of the PTT user terminal and transmitting a PTT speaking request from the calling terminal of the PTT user terminal to the called terminal of the PTT user terminal And transmits a 'PTT Talk Response' to the calling terminal of the PTT user terminal directly from the called terminal of the PTT user terminal in response to the PTT user terminal transmitting the PTT call response to the PTT user terminal Storing a recording file for a PTT remark of the corresponding currency; And (c) if the connection is made to the core network, the PTT user terminal transmits and saves the corresponding recording file to the D2D recording system, respectively.

As described above, the method of the present invention can be implemented as a program and recorded on a recording medium (CD-ROM, RAM, ROM, memory card, hard disk, magneto-optical disk, storage device, etc.) Lt; / RTI >

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and changes may be made without departing from the scope of the present invention.

700: PTT user terminal 710: LTE base station (eNB)
720: Mobility Management Entity (MME) 730: Home Subscriber Server (HSS)
740: Serving gateway (S-GW) 750: PDN gateway (P-GW)
760: PCRF 770: CSCF
780: PTT server 790: PTT recording system

Claims (8)

In PTT call recording method
A PTT server connected to the CSCF in the IP IMS interworking with the access network of the LTE network and the PS-LTE network, and a PTT server which records call voice (together with video data in the case of video call) through the PTT server in accordance with the voice control of the PTT client A recording system is provided,
(a) establishing a PTT call connection between a PTT user terminal and a calling terminal of the calling terminal and a called terminal of the calling terminal;
(b) a step (Signaling) a PTT (Push-To-Talk) call connection with the PTT recording system through the PTT server for the call connection when the call connection between the PTT clients is started;
(c) when the calling or called terminal speaks by the floor control of the PTT user terminal, the PTT client transmits a call voice (video data in case of a video call) to the PTT recording system via the PTT server according to the voice control of the PTT client Recording and recording the same); And
(d) terminating the PTT speech recording of the PTT server and the PTT recording system when the PTT user terminal transmits a PTT speech termination request to the PTT server;
And the PTT call recording method. The method according to claim 1,
The steps (a) and (b)
When a calling terminal of the PTT user terminal attempts to make a call to the PTT server by using the PTT identification number of the called terminal of the PTT user terminal, the PTT server attempts to connect to the PTT user terminal The PTT server attempts to connect to the PTT recording system, transmits a PTT recording system connection response from the PTT recording system to the PTT server, and transmits, from the called terminal of the PTT user terminal, Transmitting a call connection response to the PTT server and transmitting a call connection response from the PTT server to the calling terminal of the PTT user terminal; And
Establishing a connection between the PTT server and the PTT recording system;
And the PTT call recording method. The method according to claim 1,
The step (c)
When the PTT user terminal transmits a PTT talk request to the PTT server, the PTT server transmits a PTT talk request response to the talk requesting terminal of the PTT user terminal, and the PTT server transmits the PTT talk request to the PTT user terminal Transmitting a PTT reminder notification to the called terminal;
Receiving a PTT remark response from the called terminal of the PTT user terminal to the PTT server, transmitting the PTT speech notification to the PTT recording system, receiving a PTT remark response from the PTT recording system to the PTT server Said method comprising the steps of: The method of claim 3,
The caller terminal of the originating or PTT user terminal uses a talk burst packet to acquire a talk burst and transmits the talk burst packet to the PTT recording system from the called terminal of the originating or PTT user terminal, Wherein the PTT call recording method comprises: The method according to claim 1,
The step (d)
Transmitting, by the PTT server, a PTT utterance termination request response to the utterance request terminal of the PTT user terminal when the utterance request terminal of the PTT user terminal transmits a PTT utterance termination request to the PTT server;
Transmitting a PTT utterance termination notification from the PTT server to the called terminal of the PTT user terminal and simultaneously transmitting a PTT utterance termination notification from the PTT server to the PTT recording system; And
And terminating the PTT speech recording of the PTT server and the PTT recording system. Comprising: a TAP equipment for tapping an SGi interval between a PDN gateway and a CSCF of an EPC of a core network interworking with an access network in an LTE network; and a VoLTE recording system connected to the TAP equipment;
A VoLTE call connection step from the calling terminal VoLTE user terminal to the called terminal VoLTE user terminal via the CSCF;
A call data transmission / reception step of transmitting / receiving a call voice (together with video data in case of a video call) of an incoming / outgoing call terminal;
Terminating a VoLTE call with the calling terminal (or called terminal) VoLTE user terminal through the CSCF from the calling terminal (or calling terminal) VoLTE user terminal; And
In the VoLTE call connection step, the call data transmission / reception step, and the VoLTE call termination step, packets transmitted / received in each TAP equipment taps the SGi interval between the PDN gateway and the CSCF of the EPC are mirrored to the VoLTE recording system And recording the voice and video data of the incoming and outgoing call terminal. The method according to claim 6,
The VoLTE recording method
(a) A 'VoLTE call connection attempt' is sent from the calling terminal VoLTE user terminal to the CSCF for signaling, and a 'VoLTE call connection attempt' is sent from the CSCF to the called terminal VoLTE user terminal. The 'VoLTE call connection attempt' packet is mirrored to the recording system through the tap device installed in the section,
VoLTE call connection response 'is transmitted from the called terminal VoLTE user terminal to the CSCF, and a' VoLTE call connection response 'packet is mirrored through the Tap device installed in the SGi section between the EPC and the CSCF and is transmitted to the recording system. Transmitting a 'VoLTE call connection response' to the VoLTE user terminal;
(b) When a VoLTE call is connected to a calling terminal VoLTE user terminal and a called terminal VoLTE user terminal, a voice recording is started and a calling voice (together with video data in case of a video call) is transmitted and received between the calling terminal and the called terminal. Recording audio and video data of a calling and called party to a VoLTE recording system through packet mirroring (call mirroring) through a Tap device installed in an interval between SGs and CSCFs; And
(c) VoLTE user terminal transmits 'VoLTE call termination attempt' for signaling to the calling terminal (or called terminal), and 'VoLTE call termination attempt' is sent from the CSCF to the called terminal (or calling terminal) VoLTE user terminal In this process, a 'VoLTE call termination attempt' packet is mirrored through the Tap device installed between the EPC and the CSCF in the SGi section and is transmitted to the recording system.
The VoLTE user terminal transmits a 'VoLTE call connection response' to the CSCF, and the 'VoLTE call termination response' packet is mirrored through the Tap device installed between the EPC and the CSCF and is transmitted to the recording system , Transmitting a 'VoLTE call termination response' from the CSCF to the calling terminal (or called terminal) VoLTE user terminal;
A VoLTE call recording method comprising: In a D2D recording method in a PS-LTE network,
Switching to an off-network when a 'PTT call connection attempt' is not made to a destination terminal of the PTT user terminal through the PTT server and the calling terminal of the PTT user terminal due to a failure in the 4G LTE core network;
A call is made from the calling terminal of the PTT user terminal to the called terminal of the PTT user terminal directly on the off-network, and a 'PTT speaking request' is transmitted from the calling terminal of the PTT user terminal to the called terminal of the PTT user terminal And transmits a 'PTT Talk Response' to the calling terminal of the PTT user terminal directly from the called terminal of the PTT user terminal in response to the PTT user terminal transmitting the PTT call. Storing a recording file for a PTT remark of a call in the user terminal; And
When the PTT user terminal is connected to the core network, the PTT user terminal transmits the corresponding recording file to the D2D recording system and stores the recorded recording file in the D2D recording system. The D2D call recording method comprising:

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