KR20010097103A - Bearer service method using IS-634A based on ATM in IMT-2000 base station controller - Google Patents

Abstract

The present invention provides a bearer service method using an ATM-based IS-634A in an IMT-2000 control station. The present invention performs a bearer service procedure using an ATM-based IS-634A as a call setup procedure and a call release procedure. do. The call setup procedure transmits ATM related information necessary for originating a bearer service call from the originating control station (control station to which the originating mobile station belongs) to the switching center by means of a setup message, and the switching station is required to receive the bearer service call. Transmitting ATM related information to the called party's control station by a setup message; 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. It includes a second step of receiving. In the call release procedure, when the exchange receiving the call release message from the calling party control station transmits a message indicating release of resources allocated to the call to the calling party control station and the called party controlling station, the calling party controls the calling party's control. The station and the destination control station each perform the step of releasing the resources allocated to the call and sending a response message to the switching station.

Description

Bearer service 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 bearer service method between a control station and an exchange in a next generation mobile telecommunication system (IMT-2000), and in particular, an Asynchronous Transfer Mode (ATM) between an IMT-2000 control station and an exchange; The present invention relates to a bearer service method using an IS-634A based on an ATM in an IMT-2000 control station that provides a bearer service using an asynchronous transmission mode (IS-634A).

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.

The bearer service enables the transfer of information between access points, and performs a lower layer function. These features sometimes mean lower layers in the OSI (Open System Interconnection) hierarchy. The user can select any kind of higher layer protocol for communication. The network is not concerned about compatibility between higher layers of users.

In general, communication links between access points provide a general service for information transfer. The communication link is connected to several other networks, such as the Internet, intranets, local area networks (LANs), and ATM-based networks, each with its own device for bearer service control. Each network provides end-to-end quality of service (QOS) that is perceived by its users.

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 was required to overcome this hassle and to support high-speed multimedia communication network that sends voice, video and data to one network. Bearer service design using ATM-based IS-634A between control station and switching center Was required.

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

IMT-2000 IMT-2000 provides bearer service using IS-634A based on Asynchronous Transfer Mode (ATM) between the control station and the switching center, thereby improving data transmission and reception efficiency between the control station and the switching center and improving system performance. 2000 control station to provide a bearer service method using the ATM-based IS-634A.

In order to achieve the above object, in the IMT-2000 control station according to the present invention, a bearer service method using an IS-634A based on ATM is provided.

Bearer service call establishment method using IS-634A based on ATM,

An originating control station (control station to which the originating mobile station belongs) transmits ATM related information necessary for bearer service call origination to the switching center by a setup message, and the switching center sets up ATM related information necessary for incoming bearer service call. Transmitting to the called party control station by a message;

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. Including a second step of receiving the transmission,

The bearer service call release method using the IS-634A based on ATM,

When the exchange receiving the call release message from the calling party control station transmits a message indicating 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 party receive the call release message. The method is characterized in that the method comprises releasing resources allocated to each call and sending a response message to the switching station.

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 showing a bearer service method using an IS-634A based on ATM in an IMT-2000 control station according to the present invention;

5 is a diagram showing the configuration of an information element for specifying a connected bearer service to be provided by a network included in a setup message according to the present invention.

Hereinafter, the bearer service 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 is implemented by adding an ATM-related information element to IS-634A of a cellular network to implement an ATM-based IS-634A bearer service for supporting a high-speed multimedia communication network.

4 is a flowchart illustrating a bearer service 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 the bearer service call origination to the switching center by a setup message, and the switching center controls the called party controlling the ATM related information necessary for the bearer service call reception by the setup message. Second steps ST6 and 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 bearer service 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 comes 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, ATM related information necessary for bearer service call origination is included in a setup message and transmitted to the switching center (ST6), and the switching center includes ATM related information necessary for incoming bearer service call in a 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.

The AAL Parameter element specifies the type and factor of the AAL layer to be used for the call, and the ATM Traffic Descriptor element specifies the traffic factor for the ATM virtual channel that will be used to transfer user information between the control station and the switching center.

Broadband Bearer Capability element is an information element necessary for bearer service call origination and is an information element for designating a connected bearer service to be provided by the network. Broadband Bearer Capability elements include a Bearer Class, Traffic Type, Timing Requirements, Susceptibility to Clipping, and User-plane Connection Configuration, as shown in FIG.

As shown in FIG. 5, the Ext field of octet 3 is set to 0 when octet 3a exists, and is set to 1 when octet 3a does not exist.

Bearer Class

0 0 0 0 1 BCOB-A (Connection Oriented: CBR)

0 0 0 1 1 BCOB-C (Connection Oriented: VBR)

1 0 0 0 0 BCOB-X (Connection Oriented: AAL, Traffic Type, Timing Requirement are user defined)

All other values are reserved

Traffic Type is

Can only exist if Bearer Class is BCOB-X.

0 0 0 no indication

0 0 1 constant bit rate

0 1 0 variable bit rate

All other values are reserved

Timing Requirements

Can only exist if Bearer Class is BCOB-X.

0 0 no indication

0 1 end-to-end timing required

1 0 end-to-end timing not required

1 1 reserved

Susceptibility to Clipping

0 0 not susceptible to clipping

0 1 susceptible to clipping

All other values are reserved

User-plane connection configuration

0 0 point-to-point

0 1 point-to-multipoint

All other values are reserved

That is, after adding a Broadband Bearer Capability element for bearer service to an existing setup message in the IS-634A that is not conventional ATM based (adding AAL parameter and ATM Traffic Descriptor), ASP_a transmits the setup message to the switching center. The exchange then reads the information element (parameter) including the Broadband Bearer Capability 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 bearer service 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 ATM (Asynchronous Transfer Mode); By providing a bearer service between the exchange and the exchange, there is an effect of increasing the data transmission and reception efficiency between the control station and the exchange and improving system performance.

Claims (2)

In a bearer service method using an IS-634A between an IMT-2000 control station and an exchange station, The bearer service call establishment method using the IS-634A based on ATM, An originating control station (control station to which the originating mobile station belongs) transmits ATM related information necessary for bearer service call origination to the switching center by a setup message, and the switching center sets up ATM related information necessary for incoming bearer service call. Transmitting to the called party control station by a message; 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. Including a second step of receiving the transmission, Bearer service call release method using IS-634A based on ATM, When the exchange receiving the call release message from the calling party control station transmits a message indicating 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 party receive the call release message. The station performs the step of releasing the resources allocated to each call and sending a response message to the switching station bearer service method using the IS-634A based on the ATM in the IMT-2000 control station. The method of claim 1, wherein the setup message of the first step, A bearer service method using an IS-634A based on ATM in an IMT-2000 control station comprising a Broadband Bearer Capability element which is an information element for designating a connected bearer service to be provided by a network.