KR20010097104A - Teleservice method using IS-634A based on ATM in IMT-2000 base station controller - Google Patents

Abstract

The present invention is to provide a telecommunication service method using an ATM-based IS-634A in the IMT-2000 control station, the present invention performs a telecommunication service procedure using the ATM-based IS-634A as a call setup procedure and call release procedure do. The call setup procedure transmits a message for originating a mobile call from an originating control station to an exchange, and sets the ATM related information for call processing origination in a setup message in a teleservice from the originating control station to the exchange. The exchange exchanges the information element (parameter) in the received setup message and sends it to the process using the value of the parameter. When an incoming response from the called party's control station arrives, the called party responds to the calling party's control station to establish an ATM-based high-speed call path between the calling party and the called party. The call release procedure transmits a teleservice call release message from the calling party control station to the switching center, and transmits the call release response message from the calling party controlling station to the calling party control station through the switching center. Causes the resources allocated to to be released.

Description

Teleservice method using IS-634A based on ATM in IMT-2000 base station controller}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teleservice method between a control station and an exchange station of a next generation mobile communication system (IMT-2000), and in particular, IS-634A based on ATM (Asynchronous Transfer Mode). The present invention relates to a telecommunication service method using an IS-634A based on ATM in an IMT-2000 control station that provides a telecommunication service between an IMT-2000 control station and an exchange.

In general, the basic communication services defined in the network are divided into a bearer service and a teleservice. As shown in Fig. 1, a bearer service is defined as a service providing a capability of transmitting a signal between access points, and a teleservice is an inter-user communication using a protocol made by an agreement between network operators. It is defined as a communication service that provides full capability, including terminal equipment functions, to support this. In other words, the teleservice refers to a service that provides complete capability for communication between users by terminal equipment, network functions, and functions provided by a dedicated center.

A message is transmitted and received through an IS-634A interface between a control station and a switching station of a conventional Code Division Multiple Access (CDMA) mobile communication system.

Such a conventional CDMA mobile communication system is a non-ATM-based communication network, and cannot perform high-quality video communication, and it is required to change the communication speed according to the traffic type, and to interrupt the communication and send again.

Therefore, ATM-based network design has been required to overcome this inconvenience and to support high-speed multimedia communication network that sends voice, video and data to one network.

Accordingly, the present invention has been proposed by the necessity of the prior art as described above, and an object of the present invention is

By using the IS-634A based on Asynchronous Transfer Mode (ATM) to provide teleservice between the IMT-2000 control station and the switching center, it is possible to improve data transmission / reception efficiency and improve system performance between the control station and the switching center. An IMT-2000 control station provides a teleservice method using an IS-634A based on ATM.

Teleservice method using the IS-634A based on ATM in the IMT-2000 control station according to the present invention to achieve the above object,

Teleservice procedure using ATM-based IS-634A is performed as call setup procedure and call release procedure. The call setup procedure transmits a message for originating a mobile call from an originating control station to an exchange, and sets the ATM related information for call processing origination in a setup message in a teleservice from the originating control station to the exchange. The exchange exchanges the information element (parameter) in the received setup message and sends it to the process using the value of the parameter. When an incoming response from the called party's control station arrives, the called party responds to the calling party's control station to establish an ATM-based high-speed call path between the calling party and the called party. The call release procedure transmits a teleservice call release message from the calling party control station to the switching center, and transmits the call release response message from the switching station to the calling party control station through the switching center. Causes the resources allocated to to be released.

1 is a diagram showing a basic communication service supported by a general network;

2 is a diagram showing an ATM-based IS-634A structure between a control station and an exchange station in an IMT-2000 system employing an ATM-based network to which the present invention is applied;

3A is a schematic diagram of an ATM-based IS-634A protocol stack to which the present invention is applied;

FIG. 3B is a schematic diagram of an IS-634A protocol stack between a control station and an exchange station in a conventional CDMA mobile communication system that is not ATM based. FIG.

4 is a flowchart illustrating a teleservice method using an IS-634A based on ATM in an IMT-2000 control station according to the present invention;

Hereinafter, the teleservice method using the IS-634A based on ATM in the IMT-2000 control station according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram of an IS-634A between an ATM-based IMT-2000 control station and an exchange station to which the present invention is applied. As shown, an ATM-based IS-634A interface is performed between a base station controller (BSC) and a mobile switching center (MSC).

The ATM based IS-634A protocol stack configuration at this time is shown in Figure 3a.

Physical Layer (PHY), ATM (ATM) Layer, ATM Adaptation Layer (AAL), Service Specific Connection Oriented Protocol (SSCOP), Service Specific Coordination Function Network Node Interface (SSCF NNI), MTP3 (Message) Transfer Part 3), SCCP (Signaling Connection Control Part) and IS-634A element.

However, the IS-634A protocol stack between the control station and the switching station of the conventional CDMA mobile communication system that is not ATM based is MTP (Message Transfer Part) 1, MTP2, MTP3, SCCP as shown in Fig. 3B. (Signaling Connection Control Part), IS-634A.

The SCCP provides additional functions to the level 3 (MTP3) function of MTP in order to transfer circuit-related or non-line-related information between exchanges or special equipments from the NO.7 signaling network to the connected or disconnected network layer service. Serves to provide. SCCP and MTP3 thus provide network layer (layer 3) services of the OSI reference model. MTP2 performs layer 2 of OSI and MTP1 performs layer 1 of OSI.

The present invention adds ATM-related information elements to IS-634A of a cellular network to implement an ATM-based IS-634A teleservice for supporting a high-speed multimedia communication network.

4 is a flowchart illustrating a teleservice method using an IS-634A based on ATM in an IMT-2000 control station according to the present invention.

As shown, when the originating control station (control station to which the originating mobile station belongs) transmits a message (CompL3Info) for mobile call origination to the switching station, the switching station pages the receiving mobile station, and the called mobile station (Mobile Station; MS). A first step (ST1-ST5) of transmitting the information on the called mobile station included in the incoming response message to the calling party control station and the called party control station upon receiving a paging response message from the mobile station; The originating control station transmits the ATM related information necessary for originating a teleservice call to the switching center by a setup message, and the switching center controls the called party controlling the ATM-related information necessary for receiving a teleservice call by a setup message. A second step (ST6, ST7) for transmitting to the station; After the switching center transmits a message requesting wired / wireless resource allocation to the calling party control station and the called party control station, a message indicating that the allocation of the radio traffic channel has been successfully performed is received from the calling party controlling station and the called party controlling station. Receiving a third step (ST8-ST11); After a message indicating that alerting is occurring at the called party's control station is transmitted, when a message indicating that the called party has responded is transmitted, the calling party's control station sends a response to the called party's response message through the switching station. A fourth step of transmitting to the control station (ST12-ST17); If the calling control station transmits a call release message to the called party control station through the switching station, the called party controlling station transmits a response message for a call release to the calling party controlling station through the switching station. Steps ST18-ST21; When the switching center transmits a message instructing release of resources allocated to the call to the calling party control station and the called party controlling station, the calling party controlling station and the called party controlling station release the resources allocated to the call and respond. A sixth step (ST22-ST25) of transmitting a message to the switching center is performed.

Referring to the teleservice method using the IS-634A based on ATM in the IMT-2000 control station according to the present invention as follows.

A process for performing an ATM-based IS-634A service at an originating control station is called an access signaling processor (ASP_a), and a process for performing an ATM-based IS-634A service at a destination controlling station is called an ASP_b.

In ASP_a, a message for establishing an outgoing call (CM Service Request) from the ASP_a is included in CompLeInfo 3 (Complete Layer 3 Information) (ST1), and the exchange transmits a paging request message to ASP_b to request paging for the destination mobile station. (ST2).

In ASP_b, when a response to paging is received from the destination mobile station, the paging response message is included in CompL3Info and transmitted to the switching station (ST3). Then, when the type of mobile identity included in the paging response message is a Temporary Mobile Station Identity (TMSI), the exchange transmits Mobile Identification Number (MIN) and Electronic Serial Number (ESN) information to ASP_a and ASP_b ( ST4, ST5).

In ASP_a, the ATM related information necessary for the teleservice call origination is included in the setup message and transmitted to the switching center (ST6), and the switching center includes the ATM related information necessary for the teleservice call reception in the setup message. Transfer to the control station (ST7).

Herein, the setup message for call origination includes information elements of the setup message such as Protocol Discriminator, Reserved-octet, Message Type, AAL Parameter, ATM Traffic Descriptor, and Broadband Bearer Capability.

The Protocol Discriminator element is one octet indicating the type of message. The Reserved-octet element is 1 octet and used for a Direct Transfer Application Part (DTAP) message. It has no information element identifier and the value is always coded 0.

The Message Type element represents the message type as 1 octet. Bit 7 is used as a send sequence number in call processing messages and mobility management messages sent from mobile stations.

Among these elements, the information element necessary for originating a teleservice call includes an AAL parameter that specifies the type and factor of an AAL layer to be used for the call, and a traffic factor for an ATM virtual channel to be used for transmitting user information between the control station and the switching center. ATM Traffic Descriptor.

That is, the ASP_a transmits the setup message to the switching center by adding the AAL parameter and the ATM Traffic Descriptor to the setup message in the IS-634A which is not conventional ATM based. The exchange then reads the information element (parameter) including the AAL parameter and ATM Traffic Descriptor in the received setup message and sends it to the process using the value of the information element.

The exchange then transmits to ASP_a and ASP_b to request the wired / wireless resource allocation between the mobile station-base station-control station (ST8, ST9). Therefore, in ASP_a, after successfully allocating a radio traffic channel to the originating mobile station, an assignment complete message (Assignment Complete) is transmitted to the switching station (ST10). The ASP_b also successfully allocates a radio traffic channel to the destination mobile station and transmits an assignment complete message to the switching station (ST11).

Thereafter, an alerting message is transmitted from the ASP_b to the switching center indicating that the alerting is occurring at the called party (ST12), and the switching station transmits an alerting message indicating that the alerting is occurring at the called party at ASP_a (ST13).

Then, when an incoming response is received from the called mobile station, ASP_b sends a Connect message to the switching station indicating that the called party has answered the call (ST14), and the switching station sends this Connect message to ASP_a to inform that the called party has answered (ST15). ).

Then, ASP_a transmits the Connect Acknowledge message to the switching center in response to the Connect message (ST16), and the switching center sends the Connect Acknowledge message to the ASP_b in response to the Connect message (ST17). The caller and the receiver set up a call path for ATM-based high speed data transmission.

Thereafter, a release message (Release) is transmitted to the switching center to release the call in ASP_a (ST18), and the switching center transmits a release message to ASP_b to release the call (ST19). Therefore, in response to the release message, ASP_b transmits a Release Complete message to the exchange, and the exchange transmits a Release Complete message to ASP_a (ST20, ST21).

The exchange then sends a Clear Command message to ASP_a and ASP_b to instruct the release of the resources allocated to the call (ST22, ST23).

In ASP_a and ASP_b, the resources allocated to the call are released and a Clear Complete message is transmitted to the switching center (ST24, ST25).

As described above, the teleservice method using the ATM-based IS-634A in the IMT-2000 control station of the present invention, the IMT-2000 control station using the IS-634A based on the ATM (Asynchronous Transfer Mode); By providing a teleservice between the terminal and the switching center, there is an effect of increasing the data transmission and reception efficiency between the control station and the switching station and improving system performance.

Claims (2)

In the teleservice method using the IS-634A between the IMT-2000 control station and the switching center, Teleservice call setup method using IS-634A based on ATM, When the calling party's control station (control station to which the calling mobile station belongs) sends a message (CompL3Info) for mobile call origination to the switching station, the switching station pages the destination mobile station and responds with a paging response from the called mobile station (MS). Receiving a message, transmitting the information on the called mobile station included in the incoming response message to the calling party control station and the called party control station; The originating control station transmits the ATM related information necessary for originating a teleservice call to the switching center by a setup message, and the switching center controls the called party controlling the ATM-related information necessary for receiving a teleservice call by a setup message. A second step of transmitting to the station; After a message indicating that alerting is occurring at the called party's control station is transmitted, when a message indicating that the called party has responded is transmitted, the calling party's control station sends a response to the called party's response message through the switching station. Perform a third step of transmitting to the control station, Teleservice call release method using IS-634A based on ATM, When the calling party transmits a call release message to the called party control station through the switching station, the called party controlling station transmits a response message for a call release to the calling party controlling station through the switching station; Telemetry method using an IS-634A based on ATM in the IMT-2000 control station characterized in that performing. The method of claim 1, wherein the setup message of the second step, AAL parameter that specifies the type and factor of the AAL layer to be used for ATM-based teleservice calls, and an ATM Traffic Descriptor information element that specifies the traffic factor for the ATM virtual channel to be used for transmitting user information between the control station and the switching center. Teleservice method using an IS-634A based on ATM in the IMT-2000 control station, characterized in that.