KR20030049547A - Mobile Video-telephony Service Method based on SIP packet network in mobile communication network - Google Patents

Abstract

PURPOSE: A method for furnishing a mobile video phone service based on an SIP(Simple Internet Protocol) packet network in a mobile communication network is provided to furnish the video phone service with an SIP system, without affecting existing network elements. CONSTITUTION: If a mobile video terminal(10) connects a PDSN(Packet Data Serving Node)-1(22)(S201), the PDSN-1 allocates one of possessed SIP addresses to the mobile video terminal(10)(S202). If the mobile video terminal(10) moves to an area managed by a PDSN-2 and connects the PDSN-2(S203), the PDSN-2 allocates one of possessed SIP addresses to the mobile video terminal(10)(S204). The mobile video terminal(10) transmits an RRQ(Registration ReQuest) including the newly allocated SIP address to a gatekeeper(28) through an RAS(Registration Authentication and Status) channel(S205). The gatekeeper(28) updates description in corresponding subscriber management data of the mobile video terminal(10)(S206), and delivers an RCF(Registration ConFirm) message to the mobile video terminal(10)(S207).

Description

Mobile video-telephony service method based on SIP packet network in mobile communication network

The present invention relates to a simple IP packet network-based mobile video telephone service providing method in a mobile communication network, and more particularly, to a simple IP (Simple IP) in a mobile communication network such as CDMA-2000 1x, 1x EV-DO, and IMT-2000. The present invention relates to a method for providing a video telephony service based on a packet network to which a SIP scheme is abbreviated.

From the CDMA-2000 1x network, a mobile phone can operate as an Internet Protocol (IP) terminal, and high-speed bidirectional data service is enabled. In next-generation mobile networks, such as 1x EV-DO and IMT-2000, data rates will increase further.

Therefore, based on this, there is a need to develop a more advanced method for providing a video telephone service in a mobile communication network having a packet network.

The present invention has been made in the above technical background, and its object is to provide video telephony service according to the SIP method without affecting the existing network elements in a mobile communication network having a packet network. It is to provide a mobile video telephone service providing method.

1 is a unit configuration diagram of a SIP packet network system to which the method of the present invention is applied,

2 is a flowchart illustrating a method for providing a mobile video telephone service based on a SIP packet network in a mobile communication network according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

10: mobile video terminal 14, 16: base station

18, 20: base station controller 22, 24: packet data serving node

28: gatekeeper 30: element management system

32: billing information management system 34: customer information management system

36: network management system

100: mobile phone network (CDMA 2000 data core network)

In order to achieve the above object, a method of providing a SIP packet network-based mobile video telephone service in a mobile communication network according to the present invention is based on a simple Internet protocol (SIP) address. A method comprising: at a packet data serving node, a first step of dynamically allocating an address to a corresponding mobile video terminal connected with a plurality of said address resources; In the mobile video terminal, when the mobile video terminal is connected to an arbitrary packet data serving node different from the previous packet data serving node by the movement of the mobile video terminal and assigned a new address from the connected packet data serving node, the new address. A second step of transmitting an update request message for the communication network side; And updating the address of the corresponding mobile video terminal based on the transmitted update request message in the communication network.

The update request message is transmitted through a RAS (Registration Authentication and Status) channel, and after the updating of the third step, a registration completion message is transmitted to the corresponding mobile video terminal. Characterized in a gatekeeper (gatekeeper), the gateway to the call.

Hereinafter, a method for providing a mobile video telephone service based on a SIP packet network in a mobile communication network according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a unit configuration diagram of a SIP packet network system to which the method of the present invention is applied,

A mobile video terminal 10 to which a video camera is attached and capable of making / receiving video calls; Base stations 14 and 16 which communicate with the mobile video terminal 10 by using a wireless section; Base station controllers 18 and 20 for performing R-P interface processing, packet subscriber state management (active, dormant), packet service connection with a wireless network, and interworking with a data network;

The address is dynamically assigned to the mobile video terminal 10 connected with a plurality of Internet protocol address resources, and the PPP connection processing, visitor subscriber management with the mobile video terminal 10, and the mobile video terminal 10 Packet data serving nodes (hereinafter referred to as PDSNs) 22 and 24 which perform outgoing / receiving packet data transfer functions of the < RTI ID = 0.0 >

It is additionally installed in the mobile telephone network 100 capable of transmitting packet data, and processes a generated call of the video mobile terminal 10, passes all call processing signal messages, and uses the mobile video terminal 10. A gatekeeper 28 that manages information and status of the subscriber station and performs authentication and charging based on the subscriber information; An element management system (EMS) 30 for accessing the gatekeeper 28 and other additional equipment to perform failure, performance, configuration, accounting, and security management functions of the corresponding equipment; A billing information management system (BDS) 32 for receiving and managing billing information from the gatekeeper 28 via the element management system 30 via the TCP / IP; A customer information management system connected to the element management system 30 and managing information (e.g., subscriber number (telephone number, ID), mobile internet protocol address, etc.) of video telephone service subscribers from the gatekeeper 28 ( CDS) 34; And a network management system (NMS) 36.

FIG. 2 is a flowchart illustrating a method for providing a mobile video telephone service based on a SIP packet network in a mobile communication network according to an embodiment of the present invention. Since it is applied to the system of FIG. 1, it will be described in parallel with the operation thereof.

First, when the mobile video terminal 10 is connected to the first packet data serving node (PDSN1) 22 through the base station 14 and the base station controller 18 (S201), the PDSN1 22 The base station controller 18 and the base station 14 are allocated to the connected mobile video terminal 10 through one of the SIP addresses owned by the base station controller 18 and the base station 14 (S202). The mobile video terminal 10 uses the SIP address allocated from the PDSN1 as its destination address in the area of the PDSN1.

Thereafter, the mobile video terminal 10 moves and belongs to the management area of the second packet data serving node (PDSN2) 24, which is connected to the PDSN2 24 through the base station 16 and the base station controller 20. When connected (S203), the PDSN2 22 assigns the connected mobile video terminal 10 to one of the SIP addresses it owns through the base station controller 18 and the base station 14 (S204). ).

The mobile video terminal 10 changes the area to which it belongs to the management area of the PDSN2 24 from the area of the PDSN1 22 due to the movement, and according to the change, the new SIP address as in step S203. As soon as it is received, it recognizes this and sends an address update request message (Registration Request: RRQ) containing the newly assigned SIP address to the gatekeeper 28 as a destination through a registration authentication and status (RAS) channel. (S205).

When the gatekeeper 28 receives the address update request message, the gatekeeper 28 updates the corresponding change management data in the subscriber management data of the mobile phone terminal 10 (S206), and then renews registration confirmation indicating that the update is completed. : RCF) a message is sent to the mobile phone terminal 10 (S207).

The technical features of the present invention described above with reference to FIGS. 1 and 2 are collectively described as follows.

The gatekeeper 28 is a network element supporting video telephone call processing, subscriber database (DB) and state management functions, authentication and billing generation functions, and the like. In the present invention, all video telephone call processing signal messages are always passed through the gate cupper 28.

When the mobile video terminal 10 registers a data service, an IP address is allocated from the corresponding Packet Data Serving Node (PDSN) 22 or 24, and thus an IP address is allocated from the corresponding PDSN. The method is called a SIP method, and the present invention relates to a packet network of the SIP method.

That is, a SIP or Mobile Internet Protocol (MIP) address may be assigned according to the performance of the mobile video terminal. In the case of a terminal having a MIP function, unlike a SIP method, a home agent (the home agent) Home Agent (HA) (not shown) is assigned an IP address from the home agent.

In the present invention, the terminal assigned the IP address from the PDSN (22 or 24) immediately performs the video phone service registration process to the gatekeeper 28. After authentication is performed on the terminal pre-registered in the database managed by the gatekeeper 28, the currently assigned IP address and the MIN number of the terminal are managed in the gatekeeper 28.

In case of a terminal having a SIP function, an IP address is newly assigned when the area of the PDSN is changed according to the movement of the location. In this case, when the incoming call is attempted with the IP address information initially registered, the call cannot be connected. Therefore, in the present invention, when the IPSN of the terminal is changed, that is, when the area of the PDSN is changed in the process of changing the location of the terminal, the terminal is immediately assigned a new IP address to the gatekeeper 28 and the new IP address. Implemented to update registration. Through this, the current IP address of the terminal can be tracked so that incoming video calls can be made.

That is, in a situation where the IP address of the terminal is changed to the function of the terminal, an additional function of transmitting an address update request message (RRQ) through the RAS channel is unconditionally added to the gatekeeper 28, and the gatekeeper 28 is existing. The change history is applied to the subscriber management data of the subscriber station and an update registration confirmation (RCF) message is given to the terminal.

As such, when the SIP function is used instead of the MIP function, the Home Agent is not used among the elements of the packet network, thus saving network resources and reducing the development cost of the terminal.

Regardless of whether MIP or SIP is used, a common consideration is whether to use a public IP address or a private IP address as an IP address. A personal IP address may be used for video communication between terminals controlled in a network, but a public IP address should be used when implementing communication with mobile video terminals of another network through interworking between gatekeepers.

As described in detail above, according to the method for providing a simple IP packet network based mobile video telephone service in a mobile communication network according to the present invention, the following effects are created.

1. The type of mobile video terminal can be a type of camera attached to a general type of mobile phone and having a necessary service function, and a camera is mounted on a PDA, a notebook computer, and various hand-held devices. ) And devices may be combined. That is, it can be defined as a terminal in which a mobile phone module, a camera, and a service function are combined. 2. The service according to the present invention can be extended to the next generation mobile phone service based on two-way high-speed data transmission function beyond the existing voice-oriented, text-based mobile phone service. 3. The present invention applies the existing H.323 protocol and uses only SIP function of CDMA200 1x or more network (for example, 1x EV-DO and IMT-2000, etc.) without any additional changes to existing network elements. The service can be implemented. 4. In addition, it is possible to ensure the mobility of the terminal without using the MIP technology.

Claims (5)

In the next generation mobile communication network for data communication between mobile terminals based on Simple Internet Protocol (SIP) address, At a packet data serving node, dynamically allocating an address to a corresponding mobile video terminal connected with a plurality of said address resources; In the mobile video terminal, when the mobile video terminal is connected to an arbitrary packet data serving node different from the previous packet data serving node by the movement of the mobile video terminal and assigned a new address from the connected packet data serving node, the new address. A second step of transmitting an update request message for the communication network side; And And a third step of updating an address of a corresponding mobile video terminal based on the transmitted update request message in the communication network. Way. The method of claim 1, The method of claim 1, wherein the update request message is transmitted through an update registration admission status (RAS) channel. The method of claim 1, And a registration completion message is transmitted to the corresponding mobile video terminal after the update of the third step. The method of claim 1, The update is performed by a gatekeeper (gatekeeper) which is a gateway of all calls in the communication network. The method of claim 4, wherein The Simple Internet Protocol (SIP) address is a public Internet Protocol (Public IP) address that can be interworked between the gatekeeper (SIP) method of providing a mobile video telephone service based on the Simple Internet Protocol packet network in a mobile communication network.