KR20020024483A - Method for call set-up between mobile communication network and packet data network - Google Patents

Abstract

PURPOSE: A method of setting a call between a mobile communication network and a packet data network is provided to perform a call setup procedure to a specific mobile wireless handset of the mobile communication network from a voice/video communication terminal of the packet data network, so as to interwork the mobile communication network with the packet data network. CONSTITUTION: If a call setup request is received from a voice/video communication terminal(TE,101), a gateway transmits a call connect request signal to BTS(Base Transmission System)/BSC(Base Station Controller)(103,104). If a call connect response signal in accordance with a call receiving state of a mobile wireless handset(MS,102) is received from the BTS/BSC(103,104), the gateway transmits a channel assign indication signal to the BTS/BSC(103,104). The BTS/BSC(103,104) assign a channel to the mobile wireless handset(MS,102), and transmit a channel assign response signal to the gateway. The gateway transmits a call proceeding signal to the voice/video communication terminal(TE,101). The BTS/BSC(103,104) interwork with the mobile wireless handset(MS,102) and an IWF(Interworking Function)(105) to set a call for a packet data service. The IWF(105) transmits a call setup complete signal to the gateway. The gateway transmits a call setup response signal to the voice/video communication terminal(TE,101) to set a packet data call between the mobile wireless handset(MS,102) and the voice/video communication terminal(TE,101).

Description

Call establishment method between mobile communication network and packet data network {METHOD FOR CALL SET-UP BETWEEN MOBILE COMMUNICATION NETWORK AND PACKET DATA NETWORK}

The present invention relates to a method for interworking a mobile communication network and a packet data network in a mobile communication system, and more particularly, to a method for establishing a call from a voice / image communication terminal to a predetermined mobile wireless terminal of a mobile communication network.

In addition, the present invention, if a request for an incoming call to a mobile wireless terminal of the Plain Land Mobile Network (PLMN) from the voice / video communication terminal performing a voice / video call function using a packet data network, The present invention relates to a method of interworking between a voice / video communication terminal and a base station controller so that a base station controller can allocate a radio channel (for packet data).

H.323, defined by the ITU-T, is a standard for video conferencing communications over packet networks such as TCP / IP. This includes LAN standards for high quality video and standards for transmitting over slow lines. H.323 also becomes the standard for Voice over IP (VOIP) over the Internet.

However, when a call is set up from an H.323 communication terminal to an incoming mobile wireless terminal of a mobile communication network, a mobile switching center having a circuit switching function does not exist in a packet data network for multimedia data transmission. The problem occurs because the call setup function is performed by the gateway and the H.323 gatekeeper.

1 is a configuration diagram showing an example of a mobile communication system for explaining a conventional problem.

A base transmission system (hereinafter referred to as BTS) performs a wireless connection with mobile wireless handsets and allocates channel resources. A base station controller (hereinafter referred to as a BSC) controls a plurality of BTSs and performs a mobility control operation of a call. A Mobile Switching Center (hereinafter referred to as MSC) forms a voice call path by performing call connection between a plurality of BSCs and matching with a Public Switched Telephone Network. The Home Location Register (hereinafter referred to as HLR) includes service information and location information registered for mobile wireless terminals, and performs authentication operations and location tracking for mobile network subscribers. The location register (hereinafter referred to as VLR) is often provided in a one-to-one manner in the MSC and manages various information of mobile wireless terminals located in the area currently managed by the MSC.

However, in the above-described mobile communication network mainly for voice services, the MSC transmits a channel assignment request message to the BTS through the BSC, thereby performing radio channel allocation between the mobile wireless terminal and the BTS. However, in a packet data network connected to an H.323 terminal for multimedia data transmission, call establishment is not an MSC that performs circuit switching, but an H.323 gateway and an H.323 gatekeeper. Is made by. Therefore, in order for the mobile communication network and the packet network supporting the H.323 protocol to be interworked, a separate method of requesting resource allocation for communication with the mobile communication terminal should be devised.

Accordingly, an object of the present invention is to provide a method for establishing a call from a voice / video communication terminal of a packet data network to a specific mobile wireless terminal of a mobile communication network.

In order to achieve the above object, the present invention provides a method for establishing a call between a mobile wireless terminal of a mobile communication network and a voice / video communication terminal of a packet data network. Transmitting a call connection request signal to a controller; and receiving a call connection response signal according to a call reception state of the mobile wireless terminal from the base station / base station controller, the gateway sends a channel allocation indication signal to the base station / base station controller. Transmitting, by the base station / base station controller, assigning a channel to the mobile radio terminal and transmitting a channel assignment response signal to the gateway, and transmitting, by the gateway, a call progress signal to the voice / video communication terminal. And the base station / base station controller is configured for the mobile radio end. Setting up a call for packet data service in association with a network and a network matching device, and transmitting the call setting completion signal to the gateway by the network matching device; and the gateway sets up a call setting response signal to the voice / video communication terminal. And transmitting a packet data call between the mobile wireless terminal and the voice / video communication terminal at least.

The present invention relates to a call setup method between a mobile wireless terminal of a mobile communication network and a voice / video communication terminal of a packet data network. When a call setup request is received from the voice / video communication terminal, a gateway requests a call connection to a corresponding base station / base station controller. Transmitting a signal, and receiving a call connection response signal according to a call reception state of the mobile radio terminal from the base station / base station controller, transmitting, by the gateway, a channel assignment indication signal to the base station controller; / The base station controller assigning a channel to the mobile wireless terminal and transmitting a channel assignment response signal to the gateway, the gateway transmitting a call progress signal to the voice / video communication terminal, and the gateway is the base station / Connection with base station controller and the mobile radio terminal Setting up a call for a packet data service and transmitting a call setup response signal to the voice / video communication terminal to establish a packet data call between the mobile wireless terminal and the voice / video communication terminal. .

1 is a configuration diagram showing an example of a mobile communication system for explaining a conventional problem.

2 is a diagram illustrating an interworking configuration between a mobile communication network and an H.323 network according to an embodiment of the present invention in a mobile communication system.

3 is a diagram illustrating a call setup procedure according to an H.323 network protocol.

4A to 4B are diagrams illustrating a call setup procedure when a digital mobile communication network having an IWF and an H.323 network interwork with each other according to an embodiment of the present invention in a mobile communication system.

5A to 5B are diagrams illustrating a call setup procedure when a digital mobile communication network without an IWF and an H.323 network interwork with each other according to another embodiment of the present invention in a mobile communication system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted when it is determined that the detailed description may unnecessarily obscure the subject matter of the present invention.

2 is a diagram illustrating an interworking configuration between a mobile communication network and an H.323 network according to an embodiment of the present invention in a mobile communication system. An example of a call setup procedure from a voice / video communication terminal of a packet data network to a specific mobile wireless terminal of a mobile communication network will be described with reference to FIG. 2.

In order to provide a packet data service in conjunction with the H.323 network 20, an interworking matching device 105 (Interworking Function: IWF) provided in the mobile communication network 10 has a data modem pool and is mobile. Protocol conversion function between the communication network and the H.323 network 20, and speed matching function with the subsystems in the network. As shown in FIG. 2, the H.323 network 20 is based on an Internet Protocol (hereinafter referred to as IP) network, and the mobile communication network 10 uses the IWF 105 to access the Internet 30. ) Is linked with.

H.323 protocol is a protocol that supports real-time multimedia communication through packet network such as LAN (Local Area Network), Internet, Intranet, etc., and user data for audio and visual media. User Datagram Protocol (UDP) is used, and Transmission Control Protocol (TCP) is used for data.

As described above, the H.323 network 20 is based on an IP network and is composed of an H.323 terminal 108, an H.323 gateway 106, and an H.323 gatekeeper 107. It is used for international call service.

In the case of an Internet phone service, a specific application of a personal computer that can connect to the Internet 30 is connected to an Internet phone server (not shown), and is provided between users who have a service subscription to the server. In this case, the personal computer becomes the H.323 terminal 108, and the personal computer performs an operation of coding, compressing and packetizing the voice according to the H.323 protocol. As such, in the case of an IP phone in which the H.323 protocol is implemented without using a personal computer, H.323 communication is possible by directly connecting to an IP network, and the IP phone becomes an H.323 terminal 108.

System control of the H.323 network 20 includes H.245 (Signaling Control) control, H.225 Call Control and RAS (Registration, Admission, Status, Message) control. The H.323 network 20 performs call control and RAS control. The call control may be represented by a call method on an H.323 entity. Here, the H.323 entity refers to a terminal, a gatekeeper, a gateway, and a multipoint control unit (MCU).

The gatekeeper 107 performs overall control and address conversion, attendance node registration, and state management for the communication. The node participating in the communication starts communication by exchanging RAS messages with the gatekeeper 107. Here, H.225 RAS refers to the protocol between an endpoint (ie a terminal or gateway) and a gatekeeper. The RAS channel used to exchange RAS messages is established between the gatekeeper and the endpoint in preference to any other channel configuration. H.225 call signaling is used to establish a connection between two H.323 endpoints by exchanging H.323 protocol messages on the Call Signaling channel. The call signaling channel can be opened between two H.323 endpoints or between an endpoint and a gatekeeper. H.225 Call Control between H.323 Entities When the RAS control process ends, an H.245 Control Channel is established between the two entities.

The set of all terminals, gateways, and MCUs controlled by the gatekeeper 107 is called an H.323 zone. The gatekeeper 107 provides call control services to endpoints registered in the H.323 zone. The gatekeeper 107 performs a function of address translation and bandwidth management for the terminal and the gateway 106 to an IP or IPX address defined in the RAS. For example, if the number that can simultaneously participate in communication on a LAN is set by the network manager, the gatekeeper 107 rejects any further connection when this value is reached, thereby reducing the bandwidth of the entire communication. Can be limited. The rest will remain for e-mail, file transfer, and other LAN protocols.

Meanwhile, in the H.323 communication, the gateway 106 translates between an endpoint of the H.323 network 20 and a terminal of a network other than the H.323 network 20 (for example, the mobile communication network 10). Provide the function. In this case, the translation function includes a translation function between translations between transmission formats (ie, H.225 to H.221) and communication procedures. In addition, the gateway 106 has a translation function between the audio and video codecs, and performs call establishment and release on both the LAN side and the Switched Circuit Network (SCN) side.

3 is a diagram illustrating a call setup procedure according to an H.323 network protocol.

The end points 1, 2 can be either H.323 terminals or H.323 gateways.

The calling endpoint 1 makes an authorization request to the gatekeeper for call setup using H.255.0 Automatic Repeat Request (hereinafter referred to as ARQ) (Message 1). If the gatekeeper accepts the call, it responds with a confirmation message (message 2). If the call is rejected, the gatekeeper responds with a reject message (message 2). If no gatekeeper is present or after authorization, the originating endpoint 1 sends a call establishment request message (message 3) to the called endpoint 2.

In the case of authorization, the terminating endpoint 2 sends a Call Proceeding Message 4 indicating the message processing to the originating endpoint 1 to approve the call setup request message 3. Incoming endpoint 2 receives the incoming call and reports it to the gatekeeper.

When an acknowledgment from the gatekeeper is received, the terminating endpoint 2 sends an Alerting Message 7 instructing the originating endpoint 1 to advertise the incoming call. And when the originating endpoint 1 responds to this, the terminating endpoint 2 sends a Connect Message 8 to the originating endpoint 1.

The originating endpoint 1 then establishes an H.245 control channel and opens Media Stream Channels for transmitting audio / video data. In the description of FIG. 2 to FIG. 3, the matching of the H.323 network and the existing digital mobile communication network, which is composed of the elements of FIG. 2 and has the signaling processing procedure as shown in FIG. 3, must be performed at the H.323 gateway. I can see.

In a packet switched based network in which no switch is used among the network components, the resource allocation function performed in the existing digital mobile communication network switch of the circuit switched network and the base station control period should be additionally implemented between the gateway and the base station controller.

4A to 4B are diagrams illustrating a call setup procedure when a mobile communication network having an IWF and an H.323 network interwork with each other according to an embodiment of the present invention in a mobile communication system. Hereinafter, a description will be given with reference to FIGS. 2 and 3.

Reference numeral c denotes an H.323 signaling procedure between the H.323 terminal 108 and the H.323 gateway 106 requesting an incoming call to the mobile wireless terminal 101. Reference numeral (b) indicates a resource allocation procedure between the H.323 gateway 106 provided in the H.323 network 20 and the base station / base station controllers 103 and 104 provided in the mobile communication network 10 according to the present invention. Indicates. Reference numeral (a) shows a radio channel assignment procedure between the base station / base station controllers 103 and 104 and the mobile radio terminal 101 in accordance with the resource allocation request of the H.323 gateway 108.

First, upon receiving a call setup request message by H.323 signaling from an H.323 terminal 108, the H.323 gateway 106 transmits a connection indication message to the connected base station / base station controllers 103 and 104. Connection Indication Message) is transmitted (step 109) to inform that there is a request for a call to the mobile wireless terminal 102. The base station / base station controllers 103 and 104 that have received the connection indication message send a paging message to the mobile wireless terminal 102 and the mobile wireless terminal 102 answers, that is, the call of the mobile wireless terminal 102. The base station / base station controllers 103 and 104 transmit a connection response message to the H.323 gateway 106 according to the reception possible state (step 110).

Upon receiving the normal connection response message, the H.323 gateway 106 transmits an Assign Indication Message to the base station / base station controllers 103 and 104 for requesting resource allocation to the mobile communication network 10. In step 111), the base station / base station controllers 103 and 104 which receive this transmit a channel assign request message to the mobile radio terminal 102, and when a normal response is received (received a channel assign complete message), The base station / base station controllers 103 and 104 transmit an Assign Response Message to the H.323 gateway 106 to inform this result. (Step 112) By the above-described procedures, the mobile communication network The radio channel of (10) is allocated. Upon receiving the assignment response message, the H.323 gateway 106 sends a call proceeding message and an alerting message to the H.323 terminal 108.

Next, when the radio channel assignment is made, the base station / base station controllers 103 and 104 perform step by step call setup procedures for packet data service in association with the mobile wireless terminal 102 and the IWF 105. The above procedures are conventional in general, and referring to FIG. 4A, a radio link protocol setup step (step 113), a radio link protocol layer setup step (step 114), A point-to-point serial link establishment step (step 115);

Upon successful completion of the call setup procedure for the packet data service, the IWF 105 sends a call setup complete message to the H.323 gateway 106 using a predetermined IP address of the H.323 gateway 106. (Step 116) The call setup complete message may be a TCP / IP connection message. The H.323 gateway then sends a Connect Message to the H.323 terminal 108 in response to the response from the IWF 105, thereby providing a normal connection between the H.323 terminal 108 and the mobile wireless terminal 102. Call setup is made. In the later stages, multimedia data transmission is performed.

5A to 5B illustrate a call setup procedure when a digital mobile communication network without an IWF and an H.323 network interwork with each other according to another embodiment of the present invention in a mobile communication system.

5A to 5B illustrate a case in which a packet data service is provided by the H.323 gateway 106 using a point-to-point protocol. In FIG. 4, a packet that is performed between the IWF 105 and the mobile wireless terminal 102 in FIG. Data call setup steps are handled by the H.323 gateway 106 as indicated by reference d.

4 to 5, the H.323 gateway has an HLR, which is a function of an existing exchange, and transmits / receives signals for a specific base station controller selection and call setup procedure.

Meanwhile, in the detailed description of the present invention, an example of a call setup procedure from a terminal in a packet data network to a specific mobile wireless terminal in a mobile communication network is specifically applied to a channel allocation process for an incoming call from an H.323 gateway. As described above, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention proposes a separate method for a call setup procedure between a base station controller of a mobile communication network and a voice / video communication terminal of a packet data network so that the mobile communication network and the packet data network can be interworked. have.

Claims (7)

A call setup method between a mobile wireless terminal of a mobile communication network and an audio / video communication terminal of a packet data network, Transmitting, by the gateway, a call connection request signal to a corresponding base station / base station controller when a call setup request is received from the voice / video communication terminal; Receiving, by the gateway, a channel assignment indication signal from the base station / base station controller to the base station / base station controller upon receiving a call connection response signal according to a call reception state of the mobile wireless terminal; The base station / base station controller assigning a channel to the mobile wireless terminal and transmitting a channel assignment response signal to the gateway; Transmitting, by the gateway, a call progress signal to the voice / video communication terminal; The base station / base station controller interworking with the mobile wireless terminal and the network matching device to establish a call for packet data service, and the network matching device transmitting a call setup completion signal to the gateway; And setting a packet data call between the mobile wireless terminal and the voice / video communication terminal by the gateway transmitting a call setup response signal to the voice / video communication terminal. According to claim 1, The gateway and voice / video communication terminal, Call setup method characterized in that the H.323 Gateway (H.323 Gateway) and H.323 Terminal (H.323 Terminal). 2. The method of claim 1, wherein setting up the packet data call comprises: And a step of establishing a radio link protocol layer, and a step of point-to-point serial link setting. The call establishment completion message of claim 3, wherein the network matching device transmits to the gateway. Call control method characterized in that the transmission control protocol / Internet Protocol connection complete message. A call setup method between a mobile wireless terminal of a mobile communication network and an audio / video communication terminal of a packet data network, Transmitting, by the gateway, a call connection request signal to a corresponding base station / base station controller when a call setup request is received from the voice / video communication terminal; Receiving, by the gateway, a channel assignment indication signal to the base station controller when receiving a call connection response signal according to a call reception state of the mobile wireless terminal from the base station / base station controller; The base station / base station controller assigning a channel to the mobile wireless terminal and transmitting a channel assignment response signal to the gateway; Transmitting, by the gateway, a call progress signal to the voice / video communication terminal; The gateway establishes a call for packet data service in association with the base station / base station controller and the mobile wireless terminal, and transmits a call setup response signal to the voice / video communication terminal to communicate with the mobile wireless terminal. And establishing at least one packet data call between terminals. According to claim 5, The gateway and voice / video communication terminal, Call setup method characterized in that the H.323 Gateway (H.323 Gateway) and H.323 Terminal (H.323 Terminal). 6. The method of claim 5, wherein establishing the packet data call comprises: And a step of establishing a radio link protocol layer, and a step of point-to-point serial link setting.