KR20000018947A - Terminal access method in mobile telecommunication network based on cs-3 of broadband integrated services digital network - Google Patents

Abstract

PURPOSE: A terminal access method in mobile telecommunication network based on CS(Chip select)-3 of BISDN(Broadband Integrated Services Digital Network) is provided to maintain an access time to a mobile terminal at a minimal state and remove the time delay taken in disconnecting the access. CONSTITUTION: When there is an access call setup with a mobile terminal, a HLR(Home Location Register) acquires a routing information and transmits a call setup request message to a VLR(Visitor location register) of an incoming call side. The VLR of the incoming call side determines whether the mobile terminal is in a standby state. When it is determined that the mobile terminal is in the standby state, the VLR transmits the call setup request message to an exchanger of the incoming call side while when it is determined that the mobile terminal is not in the standby state or is in a state that can not receive services, the VLR refuses the call setup and generates a line-busy call. Thus, the method can decrease the time delay by first determining whether or not it is possible to communicate with the terminal.

Description

Method of UE Connection in Mobile Communication Network based on SES-3 of Broadband Telecommunication Network

The present invention relates to connection establishment in a broadband integrated services digital network (B-ISDN), and more particularly, to maintain a connection establishment time with a mobile terminal as quickly as possible while It is about how to eliminate the time delay of wasting and disconnecting.

In general, IMT-2000 (International Mobile Telecommunications-2000) is a system that is developed to provide users with free mobility throughout the world, and provides various services such as non-voice and wireless calling as well as voice. It is a system that integrates into a terminal, provides multimedia and intelligent services through various media provisions, and achieves thorough security of personal information as a user's own service through personalization of services. The IMT-2000 accommodates the diversity of terminals ranging from pedestrian cellular phones to vehicle telephones, as well as global mobile personal communication systems (GMPCS), public switched telephone networks (PSTN), and general information and communication networks. It also embraces the diversity of networks such as Integrated Services Digital Network (ISDN).

1 shows a block configuration of such a general IMT-2000 system.

Broadband Telecommunications Network (ISDN) is a high-speed transmission speed of 100Mbits / sec or more.It is a high-definition video or a high-definition moving image or CAD / CAM (Computer-Aided Design / Computer Aided Manufacturing). / Computer-aided production) is a system that can easily transfer data.

2 is a flowchart illustrating a connection setting method with a conventional mobile terminal, and FIG. 3 is a detailed flowchart illustrating the connection setting method of FIG. 2 in detail.

As shown in the figure, if there is a setting request with the mobile terminal, the routing information is obtained from the home location register (HLR) and the call and bearer are set up through the network as a mobile terminal, and then Querying a Visitor Location Register (VLR) to determine whether the mobile terminal is idle and whether the service is executable (ST1-ST6); Releasing calls and bearers and generating a busy tone when the mobile terminal is not in an idle state or a service executable state (ST7-ST10); If the mobile terminal is in an idle state and the service is executable, the mobile terminal comprises setting up a call and a bearer with the mobile terminal (ST11).

In the ISDN, there are a D channel and a B channel. A call is established through the D channel, and a bearer is established through the B channel. The call refers to information exchanged between systems as a telephone number when the telephone is connected, and includes a database of telephone connection types (international, domestic telephones, etc.), billing, routing information, and the like. A call is generated for each exchange. Bearer also refers to user information of the exchange and the exchange period, and means a path through which user information passes. In other words, the bearer generates only information on a call and is distinguished from a call indicating system information. On the other hand, PCS systems that do not use the D and B channels, etc. are transmitted by packetizing the system information and the content information to be delivered.

Therefore, in IMT-2000, when establishing connection with mobile terminal by conventional method, call and bearer are simultaneously set up to mobile switching center of destination after getting routing information from HLR of called user. In this way, after the connection is established to the mobile switching center of the destination, the state of the mobile terminal is queried to the destination VLR, and when the mobile terminal is idle, the connection is established through paging to the mobile terminal, and the terminal is active. ), Release the call and bearer that have already been set up and notify the caller that the called party is busy.

This conventional method has the advantage of providing a fast connection under the assumption that the mobile terminal is idle, but if the mobile terminal is active, it not only wastes transmission resources, but also establishes a call already established. Due to the delay in the time taken to release the bearer and the bearer, the called party's busy state cannot be quickly transmitted to the calling party. That is, since the call and bearer are set up from the calling network to the called network before paging of the mobile terminal, it is necessary to release the resources (calls and bearers) that have already been taken when the mobile terminal is busy or cannot receive a call. Since the time becomes long and other users cannot use the resource during the time, there is a problem causing waste of network resources.

This resource waste phenomenon can be especially serious in the IMT-2000 system which targets wireless multimedia services. Because the existing wireless network that only delivers voice only holds bearer resources of about 8K to 64K, multimedia services require up to 2M of bearer resources, resulting in the problem of causing up to 250 times the waste of resources.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, an object of the present invention is to maintain the connection setting time with the mobile terminal as quickly as possible while the waste of transmission resources and connection when the terminal is active The present invention provides a method for connecting a terminal in a mobile communication network based on CS-3 of a broadband integrated information network to eliminate the time delay required for release.

In order to achieve the above object, a method of terminal connection in a mobile communication network based on CS-3 of the broadband integrated information communication network according to the present invention,

A first step of acquiring routing information from the HLR and sending a call setup request message to the called party's VLR if there is a setup request with the mobile station, and the called party's VLR determines an idle state of the mobile terminal; A second step of transmitting a call setup message to a called side exchange when the mobile terminal is in an idle state, and then determining whether the mobile terminal can perform service; A third step of rejecting a call setup and generating a busy signal to notify the caller of the caller's inability to talk if the called party's mobile terminal is not in an idle state or a service execution state; When the called party's mobile terminal is in a callable state, it is characterized in that it comprises a step of establishing a call at the called side exchange and simultaneously transmitting a bearer setting message to the called side mobile terminal and the calling side exchange.

1 is a block diagram of a general IMT-2000 system;

2 is a flowchart illustrating a connection setting method with a conventional mobile terminal;

3 is a detailed flowchart illustrating the connection setting method of FIG. 2 in detail;

Figure 4 is a block diagram showing the relationship between the coexistence and bearer connection in CS-3 to which the present invention is applied,

5 is a flowchart illustrating a terminal connection method in a mobile communication network based on CS-3 of the broadband integrated information communication network according to the present invention;

6 is a detailed flowchart illustrating the connection setting method of FIG. 5 in detail.

<Explanation of symbols for main parts of the drawings>

10, 11: call control unit

20, 21, 22: connection control unit

Hereinafter, with reference to the accompanying drawings an embodiment according to the technical concept of the terminal connection method in the mobile communication network based on CS-3 of the present invention configured as described above is as follows.

Figure 4 is a block diagram showing the relationship between the coexistence and bearer connection in CS-3 to which the present invention is applied.

Therefore, in CS-3 (Capability Set-3) of B-ISDN, a call controller 10 and 11 and a connection controller 20-22 support a structure in which a network is modularized. . This allows calls to be created only at the user and end-to-end exchanges, and allows the connection owner to establish bearers in the opposite direction to the call creation regardless of the call owner. do.

In this case, CS-1 performs a single call setup by point-to-point connection, and a general telephone belongs to this example, and CS-2 uses a point-to-multipoint connection to connect one calling point to multiple destinations. It is used for image class, multi-connection, voice and video information transmission. CS-3, on the other hand, functions as a multipoint-to-multipoint.

4 is an abbreviation of Call Control function, and CM is an abbreviation of Connection Management function.

Thus, the call establishment message bypasses the LR (Location Register) to reach the destination switching center (MSC, Mobile Switching Center, mobile communication switch), and the call is generated after end-to-end service negotiation is made. . When the call is successfully generated, the bearer is connected in the reverse direction by the connection controller 20-22.

In such a method, the effects of waste of transmission resources and busy tone transmission delay in the active (busy) state, which are disadvantages, are maintained while maintaining the characteristics of fast communication to an idle terminal, which is an advantage of the conventional method. Can be eliminated.

FIG. 5 is a flowchart illustrating a terminal connection method in a CS-3 mobile communication network based on the present invention, and FIG. 6 is a detailed flowchart illustrating the connection establishment method of FIG. 5.

As shown in the drawing, when there is a setting request with the mobile terminal, routing information is obtained from the HLR and the call setup request message is transmitted to the called-side VLR, and the called-side VLR determines the idle state of the mobile terminal (ST51). ST55); A second step (ST56) (ST57) of transmitting a call setup message to a called side exchange when the mobile terminal is in an idle state and then determining whether the mobile terminal can perform service; A third step (ST58-ST61) of rejecting a call setup and generating a busy signal to notify the caller of the caller's inability to call if the called party's mobile terminal is not in an idle state or a service execution state; If the called mobile terminal is in a callable state, it performs a fourth step (ST62) (ST63) of establishing a call at the called exchange and simultaneously transmitting bearer setup messages to the called mobile terminal and the calling exchange.

Wherein the first step (ST51-ST55), if the call setup command is received from the calling mobile terminal, the calling VLR transmits a routing information query command to the Location Registration Control Function home (LRCFh) of the HLR; The LRCFh receiving the routing information query command transmits a user profile retrieval command to a location registration data function home (LRDFh), receives a response, and transmits a response to the routing information query to the calling VLR; The calling party VLR sending a call establishment request command to the called party VLR; The VLR receiving the call setup request command performs the step of determining whether the called mobile terminal is in an idle state by searching the ID (value) and the state of the called mobile terminal.

And SSF / CCFo of the exchange stands for Service Switching Function / Call Control Function originating, SSF / CCFt stands for Service Switching Function / Call Control Function terminating, LRCFvo of VLR stands for Location Registration Control Function visiting originating, LRCFvt Is an abbreviation for Location Registration Control Function visiting terminal, LRDFvo is an abbreviation for Location Registration Data Function visiting originating, and LRDFvt is an abbreviation for Location Registration Data Function visiting terminal.

Thus, in B-ISDN CS-3, modular network elements are supported. The call control unit 10 (11) is located at the end of the network to handle negotiation of quality of service (QoS). 22) performs a connection by determining bearer characteristics between nodes of a network. The connection control unit 20-22 may be mapped to a function of a B-ISDN user part (B-ISUP) protocol stack, and the call control unit 10 or 11 may be mapped to a call control application protocol (CCAP) of an exchange.

If the IMT-2000 adopts the B-ISDN having such a structure as the core network (transport network), it is possible to provide various efficient connection services by using a signaling function in which call and bearer are separated. .

When the originating exchange becomes a call owner and sends a call establishment message to the user's HLR (of course, the call establishment message is delivered in the form of an interface message between the exchange and the LR. For example, a TCAP (Transaction Capabilities Application Part) Sub) message), the HLR sends this message back to the destination VLR. The called VLR receiving the call setup message detects the state of the terminal and sends a call setup rejection message if the terminal is ACTIVE, and delivers the call setup message to the called side exchange if the terminal is idle.

Therefore, after receiving the call establishment message, the exchange determines whether the service request included in the message can be accepted, and if it cannot accept the call establishment rejection message directly to the calling party (calling party exchange). If the called exchange can accept the service request, it sets up a call and instructs the connection control unit 20-22 (ie, B-ISUP) to establish a connection between the calling party and the terminal. The connection controller 20-22 establishes a connection by negotiation through bearer-related information elements (IEs) included in the B-ISUP message.

Accordingly, the present invention not only satisfies the quick connection to the idle terminal by processing the bearer setup with the destination exchange and the mobile terminal through the network, which takes most of the time for call setup, but also when the terminal is active. There is no waste of transmission resources, and it is possible to quickly transmit busy tone to the calling party.

As such, the present invention eliminates the waste of transmission resources and the time delay required for disconnection when the terminal is active while maintaining the connection establishment time with the mobile terminal as quickly as possible.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the terminal connection method in the mobile communication network based on CS-3 of the broadband integrated information communication network according to the present invention wastes resources because the actual bearer connection is performed after paging to determine whether the terminal can be called. If the terminal is unable to make a call, it is possible to reduce the time delay for disconnection by releasing the call in a short time.

Claims (2)

A terminal connection method in a mobile communication network based on SES-3 of a broadband integrated information communication network, wherein the terminal connection method includes: If there is a setting request with the mobile terminal, routing information is obtained from the HLR (Home Location Register), and a call setup request message is transmitted to the destination VLR (Visitor Location Register), and the destination VLR is configured to determine the idle state of the mobile terminal. Step 1; A second step of transmitting a call setup message to a called side exchange when the mobile terminal is in an idle state, and then determining whether the mobile terminal can perform service; A third step of rejecting a call setup and generating a busy signal to notify the caller of the caller's inability to talk if the called party's mobile terminal is not in an idle state or a service execution state; If the called mobile terminal is in a callable state, establishing a call at the called exchange and transmitting a bearer setting message to the called mobile terminal and the calling exchange at the same time. Terminal connection method in 3 based mobile communication network. The method of claim 1, wherein the first step, Transmitting a routing information query command to the Location Registration Control Function home (LRCFh) of the HLR when the calling VLR is received from the calling mobile terminal; The LRCFh receiving the routing information query command transmits a user profile retrieval command to a location registration data function home (LRDFh), receives a response, and transmits a response to the routing information query to the calling VLR; The calling party VLR sending a call establishment request command to the called party VLR; The VLR receiving the call establishment request command performs a step of determining whether the called mobile terminal is in an idle state by searching the ID (value) and the state of the called mobile terminal. Terminal connection method in 3 based mobile communication network.