KR100577063B1 - Duplication apparatus and method for aal2 user traffic in wcdma utran - Google Patents

Abstract

The present invention relates to a method for redundancy of an ATM Adaptation Layer 2 (AAL2) bearer in a state in which a control station of a mobile communication system does not duplicate an external interface board. Delivering the AAL2 bearer setup request message to the configured first interface board, extracting AAL2 bearer information from the AAL2 setup request message received from the upper processor, and extracting the extracted AAL2 bearer information; Setting a device, transmitting a response message to the setting request message to the upper processor, and transmitting the AAL2 bearer information to a second interface board configured as a standby board, wherein the second interface board includes: Device for receiving the AAL2 bearer information received from a first interface board It is characterized in that it comprises a step of performing AAL2 bearer duplication by setting to. In the present invention as described above, when the traffic redundancy is supported using two external interface boards, the call failure rate can be reduced and system stabilization can be expected because the call setup is performed only by the state of the active board regardless of the state of the standby board.

Redundancy, RNC, Iu Interface, Iur Interface, AAL2 Bearer

Description

Duplication APPARATUS AND METHOD FOR AAL2 USER TRAFFIC IN WCDMA UTRAN}             

1 is a view for explaining the duplication of a board unit according to the prior art.

2 is a diagram illustrating an AAL2 bearer setup procedure during handover in a cdma2000 system according to the prior art.

3 is a diagram schematically showing a UMTS system to which the present invention is applied.

4 is a diagram illustrating a configuration of an RNC according to the present invention.

5 is a diagram illustrating a procedure for duplexing AAL2 bearers in a radio network controller (RNC) according to an embodiment of the present invention.

The present invention relates to a control station of a mobile communication system, and more particularly, to an apparatus and a method for duplexing ATM Adaptation Layer 2 (AAL2) user traffic without duplication of an external interface board at a control station.

UMTS (Universal Mobile Telecommunication Services) system is a third generation mobile communication system combining Code Division Multiple Access (CDMA) technology based on the European Global System for Mobile communication (GSM). Leading standardization in the 3rd Generation Partnership Project (3GPP), this system can efficiently deliver high-speed data / multimedia services up to 2 Mbps compared to existing 2nd generation systems, and is expected to be widely used worldwide and can be used anywhere. Provide international roaming capabilities. The major difference is that the Global Positioning System (GPS) is not used for synchronization compared to the cdma2000 system, which is a third generation system standard. This is called an asynchronous system.

Currently, in both UMTS and cdma2000 systems, since the backbone network is Asynchronous Transfer Mode (ATM), both signaling and user traffic use ATM cells. In user traffic, voice and circuit use AAL2 cells and packets use AAL5 cells.

Each component of UMTS system supports redundancy to stabilize call and billing, and supports board unit redundancy for each component. There are two board-level redundancies. There are two ways to operate the first two boards in dual active mode, and a second one in standby and standby mode. The dual active method has a disadvantage in that the software of the two boards is difficult to synchronize correctly, and once synchronization is not achieved, it cannot be synchronized again.

In the base station system (UTRAN: UMTS Terrestrial Radio Access Network) of the UMTS system, both the base station (Node-B) and the control station (RNC: Radio Network Controller) both support board-level redundancy.

Board unit redundancy is shown in FIG. As shown, board-level redundancy duplicates the link itself. The first ATM switch 11 is connected to the first board 13 and the second board 14, and the second ATM switch 12 is also connected to the first board 13 and the second board 14. Here, assuming that the first board 13 is an active board and the second board 14 is a standby board, the information of the active board 13 that changes in real time is an Ethernet path. It is transmitted to the standby board 14 through. At this time, the standby board 14 only backs up information from the active board 13, but does not perform other operations. In this way, two boards can be redundant using the Ethernet pass.

However, the interface boards connected to the external components among the components of the UMTS system do not support board duplication because the link itself is not duplicated. As such, in order to duplicate only user traffic without duplication of interface boards, the software of both boards must support duplication.

For example, the cdma2000 system, which is a synchronous system, supports user traffic redundancy only during inter-BSC and inter-MSC handover. The process is as follows.

Referring to FIG. 2, a software block (A2CP) that sets up an AAL2 bearer first transmits an AAL2 bearer setup request message to a first interface board set as an active board in step 21. At the same time, the A2CAP transmits an AAL2 bearer setup request message to the second interface board configured as the standby board in step 22. Then, the first interface board extracts AAL2 bearer information from the AAL2 bearer setup request message received in step 23, and sets the extracted AAL2 bearer information to the device. In step 24, a response message for the AAL2 bearer establishment request message is transmitted to the A2CP. Meanwhile, the second interface board also extracts AAL2 bearer information from the AAL2 bearer establishment request message received in step 25 and sets the extracted AAL2 bearer information to the device. In step 26, a response message for the AAL2 bearer establishment request message is transmitted to the A2CP. As shown, AAL2 bearer release is also performed with the above procedure.

In the above-described scheme, the block for setting the AAL2 bearer (A2CP) needs to know the detachment and mounting states of the two interface boards correctly, and the call may not be set according to the standby board state. That is, the subscriber call may not be established when the AAL2 bearer setup fails in the active board or the standby board. If only the active board is normal, the call should be set regardless of the standby board. However, the above-described conventional method has a problem in which the call is affected by the state of the standby board.

Accordingly, an object of the present invention is to provide an apparatus and method for duplexing user traffic without duplication of an external interface board that interfaces with an external subsystem in a mobile communication system.

Another object of the present invention is to provide an apparatus and method for duplexing user traffic without duplexing an external interface board in a radio network controller (RNC).

It is still another object of the present invention to provide a method for establishing a call using only a state of an active board regardless of a state of a standby board when duplexing user traffic in a radio network controller (RNC).

According to a first aspect of the present invention for achieving the above object, in the apparatus for dualizing the ATM Adaptation Layer 2 (AAL2) bearer in the state that the control station of the mobile communication system does not duplicate the external interface board, In a call setup, a control processor for transmitting an AAL2 bearer setup request message to a first interface board configured as an active board, extracts AAL2 bearer information from the setup request message, sets the device to a device, and responds to the setup request message. AAL2 bearer redundancy is established by setting the AAL2 bearer information from the first interface board and the AAL2 bearer information from the first interface board to the device, the AAL2 bearer information being transmitted to the control processor and configured as a standby board. Comprising the second interface board performing It is characterized by.

According to a second aspect of the present invention for achieving the above object, in the method for dualizing the ATM Adaptation Layer 2 (AAL2) bearer in the control station of the mobile communication system without the redundant external interface board, When the host processor establishes a call, transmitting an AAL2 bearer setup request message to the first interface board configured as an active board, and the first interface board sends AAL2 bearer information in the AAL2 setup request message received from the upper processor. Extracting the AAL2 bearer information and setting the extracted AAL2 bearer information to a device, transmitting a response message to the setting request message to the upper processor, and delivering the AAL2 bearer information to a second interface board configured as a standby board. And the second interface board is connected to the first interface board. Setting the received AAL2 bearer information to a device to perform AAL2 bearer duplication.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described in the control station (BSC or RNC) of the mobile communication system to duplicate the AAL2 (ATM Adaptation Layer 2) user traffic without the external interface board. In particular, the present invention is characterized in that the call is established only in the state of the active board regardless of the state of the standby board when the user traffic is duplicated.

FIG. 3 schematically illustrates a Universal Mobile Telecommunication Services (UMTS) system to which the present invention is applied.

Referring to FIG. 3, first, a user equipment (UE) 100 represents a mobile communication terminal, and includes a USIM (Mobile Equipment) 102 serving as a wireless modem and subscriber authentication related information. It includes a Universal Service Identification Module (CARD) card.

The radio access network 110 includes a Node B 111 and an RNC 112. The Node B 111 converts the data flow between the Iub and Uu interfaces. That is, it performs radio signal transmission and reception, radio channel encoding and decoding, signal strength and quality measurement (uplink), baseband signal processing, diversity, radio resource management, and self maintenance. The radio network controller (RNC) 112 performs functions such as matching with the Node B 111, handover processing between cells, call control, and the like, a mobile service center (MSC) and a serving GPRS support node (SGSN). ) And external access signal link and bearer channel connections.

Core network 120 comprises MSC / VLR 121, SGSN 122, HLR 123, GMSC 124, GGSN 125. The MSC / VLR (Mobile Services Center / Visitor Location Register) 121 is a switch (MSC) and a database (VLR) provided to a user equipment (UE) at a current location for a circuit switched (CS) service. . The function of the MSC is used for the exchange of CS tasks, and the VLR function keeps a more accurate copy of the location of the UE within the support system as well as the service profile of the visiting user.

The Serving GPRS Support Node (SGSN) 112 is similar to that of the MSC / VLR 100 but is generally used for Packet Switching (PS) services. The portion of the network that is connected via SGSN 112 is often considered a PS domain.

The HLR 112 is a database located in a user home system that stores a master copy of a user service profile. For example, a service profile consists of supplementary service information such as allowed service information, forbidden roaming area, number of call transfers and call transfer status. It is created when a new user joins the system and remains stored while subscribed. For the purpose of sending a task (call or short message) to the UE, the HLR stores the UE location at the MSC / VLR and SGSN levels, which are supported system levels.

The Gateway MSC (GMSC) 124 is a switch at the point where the UMTS PLMN is connected to the external CS network 130. All incoming and outgoing CS connections go through the GMSC 124. The Gateway GPRS Support Node (GGSN) 125 is close to the functionality of the GMSC 124 but is associated with a Packet Switched (PS) service. That is, the GGSN 125 is a GPRS gateway node directly connected to a packet data network or the Internet. The GGSN 125 performs GTP tunneling and IP (Internet Protocol) routing functions by maintaining routing information to the SGSN 122.

As shown in FIG. 3, the RNC 112 is connected to the Iur interface, and the RNC 112 and the MSC / VLR 121 are connected to the Iu-CS interface. The user plane of this Iu-CS and Iu interface uses an AAL2 bearer. The present invention is to duplicate the AAL2 bearer for the stability of the system and the high reliability of the service. AAL2 bearer duplication is supported by the interface board of the RNC 112.

4 shows the configuration of the RNC 112 according to the present invention mainly on the interface board.

As shown, the RNC 112 is equipped with a call processing program such as an access link control application part (ALCAP), the control processor 400 for controlling the overall operation of the RNC 112, traffic for processing traffic A traffic handling module (THM) 402, an ATM switch 402 for ATM cell switching inside the RNC 112, and a signal / traffic channel on the Iub interface and an RNC 112 internal channel. A plurality of Iu interface boards 403, a plurality of Iu interface boards 404 connecting the signal / traffic channel in the Iu interface and the internal channel of the RNC 112, and a signal / traffic channel and the RNC 112 in the Iur interface. A plurality of Iur interface boards 405 for connecting internal channels are configured.

Here, the Iub interface boards 403 match with E1, and the Iu interface boards 404 and Iur interface boards 405 match with STM-1 (Synchronous Transfer Mode-1). In the figure, four boards are connected to each interface, but the number of boards may be variously implemented according to a situation.

Hereinafter, a method of dualizing an AAL2 bearer using two lu interface boards will be described.

When one of the two boards is used as an active board and the other as a standby board, the two boards match link state information with the power through Automatic Protection Switching (APS). The RNC 112 uses a permanent virtual connection (PVC) and establishes an AAL2 bearer only on a link board when a subscriber attempts to call.

Referring back to FIG. 4, the ALCAP mounted in the control processor 400 maintains state information of the Iu-CS and Iur interface boards 404 and 405 and requests the AAL2 bearer to be set up by the active board when the subscriber attempts to call. Set up an AAL2 bearer by passing a message. The active board receiving the AAL2 bearer setup request message extracts AAL2 bearer information from the message, configures it in the device, and backs up AAL2 bearer information to a standby board to duplicate the AAL2 bearer. In the drawing, reference numeral 406 shows a backup path when the information is backed up from the active board to the standby board.

Looking at this process in detail with reference to the drawings as follows.

5 illustrates a procedure for duplexing AAL2 bearers in a radio network controller (RNC) according to an embodiment of the present invention.

Referring to FIG. 5, in a call setup, a software block for setting an AAL2 bearer (ALCAP) transmits an AAL2 bearer setup request message to a first interface board configured as an active board in step 501. In step 502, the first interface board extracts AAL2 bearer information (Virtual Path Identifier (VPI), Virtual Channel Identifier (CID), and Channel Identifier (CID), etc.) from the AAL2 bearer setup request message received from the ALCAP. In step 503, the first interface board sets the extracted AAL2 bearer information to the device, and sends a response message to the A2CAP to the A2CAP.

At the same time, the first interface board transmits AAL2 bearer configuration information to the second interface board set as the standby board in step 504. In step 505, the second interface board sets AAL2 bearer configuration information received from the first interface board to the device to perform AAL2 bearer duplication.

This redundancy scheme enables signaling data using AAL5 to support AAL2 bearer redundancy while using both boards independently.

Meanwhile, the AAL2 bearer is released through the same process as described above. In brief, when the ALCAP sends an AAL2 bearer release request message to the active board, the active board releases a preset AAL2 bearer. The active board transmits a response message to the AAL2 bearer release request message to the ALCAP. At the same time, the active board transmits AAL2 bearer release information to the standby board, and the standby board releases a preset AAL2 bearer.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but 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 those equivalent to the scope of the claims.

As described above, the present invention can reduce the call failure rate and improve the stability of the system because the call setup is performed only by the state of the active board regardless of the state of the standby board when supporting traffic redundancy using two external interface boards. can do. In addition, signaling data using AAL5 has the advantage of dualizing the AAL2 bearer simultaneously while using both boards independently.

Claims (6)

An apparatus for redundancy of an ATM adaptation layer 2 (AAL2) bearer in a state in which a control station of a mobile communication system does not duplicate an external interface board. A control processor for transmitting an AAL2 bearer setup request message to a first interface board configured as an active board at call setup; Extracting AAL2 bearer information from the setup request message, setting the device to a device, transmitting a response message to the setup request message to the control processor, and transferring the AAL2 bearer information to a second interface board configured as a standby board; 1 interface board, And the second interface board for setting AAL2 bearer information from the first interface board to a device to perform AAL2 bearer duplication. The method of claim 1, The AAL2 bearer information includes a virtual path identifier (VPI), a virtual channel identifier (VCI), and channel identifier (CID) information. The method of claim 1, And the control station is a radio network controller (RNC) configured in an asynchronous mobile communication system. Claims [1] A method for duplicating an ATM Adaptation Layer 2 (AAL2) bearer without duplicating an external interface board at a control station of a mobile communication system. Transmitting, by the upper processor, an AAL2 bearer establishment request message to the first interface board configured as the active board when the call is established; Extracting, by the first interface board, AAL2 bearer information from the AAL2 setup request message received from the upper processor, and setting the extracted AAL2 bearer information in a device; Delivering a response message to the setup request message to the upper processor, and transmitting the AAL2 bearer information to a second interface board configured as a standby board; And setting, by the second interface board, the AAL2 bearer information received from the first interface board to a device to perform AAL2 bearer duplication. The method of claim 4, wherein The AAL2 bearer information includes a virtual path identifier (VPI), a virtual channel identifier (VCI), and channel identifier (CID) information. The method of claim 4, wherein And the control station is a radio network controller (RNC) configured in an asynchronous mobile communication system.

Images