KR100452627B1 - AAL2 channel connection method between Node B and RNC in wireless communication system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an AAL2 channel access method between a base station and a control station in a wireless communication system.

2. The technical problem to be solved by the invention

The present invention provides a resource management method for AAL2 channel configuration in a control station of an IMT-2000 asynchronous system to reduce the load of the Iub interface module and enable efficient AAL2 channel access, and the AAL2 channel information received from the control station at the base station. To provide an AAL2 channel access method and a computer readable recording medium having recorded thereon a program for realizing the above method for extracting the data and facilitating interface module control and internal setting.

3. Summary of Solution to Invention

A method of accessing an AAL2 channel between a base station and a control station applied to a wireless communication system, the method comprising: a resource allocation step of allocating resources for an AAL2 channel and performing internal configuration according to an AAL2 connection establishment request from a control station; A first forwarding step of forwarding an AAL2 connection establishment request message performed through the resource allocation to a base station; A resource setting step of setting a resource for an AAL2 channel and performing internal setting according to AAL2 channel information in an AAL2 connection establishment request message transmitted through the base station; And a second forwarding step of delivering an AAL2 connection establishment confirmation message to a control station after performing the internal setup.

4. Important uses of the invention

The present invention is used in a wireless communication system.

Description

AAL2 channel connection method between Node B and RNC in wireless communication system}

The present invention relates to an AAL (ATM: ATM Adaptation Layer) channel access method between a base station and a control station in a wireless communication system, and to a computer readable recording medium recording a program for realizing the method. Particularly, IMT (International Mobile) Telecommunications) -2000 AAL2 channel access method and program for realizing the method to provide a resource management scheme for AAL2 channel setting in the asynchronous system to reduce the load of the Iub interface module to enable efficient AAL2 channel access. A computer readable recording medium for recording thereon.

In general, the structure between a base station and a control station according to the Standard for IMT-2000 Asynchronous System (3GPP) is as follows.

The logical connection between the base station and the control station is called an Iub interface, which is supported by one or more physical links. Signaling message exchange in the Iub interface is supported by the AAL5 / Asynchronous Transfer Mode (ATM) layer.

On the other hand, since traffic data is exchanged through the AAL2 / ATM layer, traffic bearer setup is performed through an access link control application part (ALCAP) supporting the AAL2 signaling protocol (ITU-T Recommendation Q.2630.1) (see FIG. 2).

The AAL2 signaling protocol has the function of setting / release / management of AAL2 channel. The resources allocated for the AAL2 channel configuration are the Virtual Path Identifier (VPI) and the Virtual Channel Identifier (VCI), which are ATM Virtual Channel Connection (VCC) connection identifiers, and the Channel Identifier (AAL2) (CID) that distinguishes the AAL2 channel. The AAL2 channel uses the same channel address (VPI + VCI + CID) in both the forward and reverse directions.

In a conventional mobile communication system, traffic channel access between a base station and a control station was supported as a Permanent Virtual Connection (ATM) based on AAL5. In other words, an access method that integrates and manages channel resources in a base station and a control station and sets and uses a VCC corresponding thereto is used.

However, the conventional traffic bearer access method uses more ATM resources than the AAL2 / ATM transmission method which multiplexes and transmits multiple channels, and independently manages resources between the base station and the control station because of integrated management of channel resources in the base station and the control station. There is a problem that can not manage.

The present invention has been proposed to solve the above problems, and provides a resource management method for AAL2 channel setting in the control station of the IMT-2000 asynchronous system, thereby reducing the load of the Iub interface module and enabling efficient AAL2 channel access. A computer-readable recording medium recording an AAL2 channel access method and a program for realizing the method for extracting AAL2 channel information received from a control station from a base station for easy interface module control and internal setting. The purpose is to provide.

1 is an exemplary configuration diagram of an IMT-2000 asynchronous system to which the present invention is applied.

2 is a diagram illustrating a protocol relationship between a base station and a control station in an IMT-2000 asynchronous system to which the present invention is applied;

3 is a flowchart illustrating an AAL2 channel access method between a base station and a control station in an IMT-2000 asynchronous system according to the present invention;

* Explanation of symbols for the main parts of the drawings

101: control station control processor 102: Iub interface module (LIU-B)

103: physical link between the base station and the control station 104: base station control processor

105: Iub Interface Module (RNI) 106: Channel Card

107: traffic processing subsystem 108: ATM switch

109: ATM Router

The method of the present invention for achieving the above object, in the AAL2 channel connection method between the base station and the control station applied to the wireless communication system, in accordance with the AAL2 connection establishment request from the control station, allocates resources for the AAL2 channel and internal settings Resource allocation step of performing; A first forwarding step of forwarding an AAL2 connection establishment request message performed through the resource allocation to a base station; A resource setting step of setting a resource for an AAL2 channel and performing internal setting according to AAL2 channel information in an AAL2 connection establishment request message transmitted through the base station; And a second forwarding step of forwarding the AAL2 connection setup confirmation message to the control station after performing the internal setup.

In addition, the present invention provides a wireless communication system including a processor, comprising: a resource allocation function for allocating a resource for an AAL2 channel and performing internal configuration according to an AAL2 connection establishment request from a control station; A first forwarding function for forwarding an AAL2 connection establishment request message performed through the resource allocation to a base station; A resource setting function for setting a resource for an AAL2 channel and performing internal setting according to AAL2 channel information in an AAL2 connection establishment request message transmitted through the base station; And a computer readable recording medium having recorded thereon a program for realizing a second transfer function for delivering the AAL2 connection establishment confirmation message to the control station after performing the internal setup.

Traffic channel establishment between the base station and the control station is accomplished through AAL2 signaling protocol message exchange. Since AAL2 channel setting is required by the application program in the control station, resource management at the Iub interface is performed at the control station. Since the base station and the control station are connected by one or more physical links, link management as well as ATM VCC management and AAL2 channel management must be performed. The traffic channel resources allocated by the control station are delivered to the base station by the AAL2 signaling protocol message. The base station performs interface module control and internal connection through the received AAL2 channel information.

In the Iub interface, the signal channel uses AAL5 / ATM transmission and the traffic channel uses AAL2 / ATM transmission. Therefore, each interface module in the base station and the control station determines the AAL type through the cell header. It connects to the channel.

Accordingly, in the present invention, the control station provides a resource management method for AAL2 channel setting to reduce the load of the Iub interface module, enable efficient AAL2 channel access, and extract the AAL2 channel information received from the control station from the base station to the interface. To facilitate module control and internal configuration.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of an IMT-2000 asynchronous system to which the present invention is applied and shows a relationship between a base station and a control station.

As shown in Fig. 1, the IMT-2000 asynchronous system to which the present invention is applied is a processor in which a call processing program such as a control station ALCAP operates, a control station control processor 101 for controlling each module in a control station, and a base station interface. Iub interface module (LIU-B) 102, which connects the signal / traffic channel in the Iub interface with the control station internal channel as a module, a traffic processing subsystem 107 having a traffic channel connection function between the terminal and the switching center, and the switching center interface. A control station including an interface module (LIU-N) for supporting a traffic switch and an ATM switch 108 for performing traffic channel connection and routing, and a processor for operating a call processing program such as a base station ALCAP to control each module in the base station. Base station control processor 104 connects the signal / traffic channel on the Iub interface with the base station internal channel as a control station interface module. A number of base stations including an Iub interface module (RNI) 105, a channel card 106 for connecting a radio channel between a base station and a terminal, and a transmission channel between a base station and a control station, and an ATM router 109 performing routing. Base station # 1 to base station #N).

The physical link 103 between the base station and the control station supports the Iub interface as a physical link connecting the base station and the control station.

3 is a flowchart illustrating an AAL2 channel access method between a base station and a control station in an IMT-2000 asynchronous system according to the present invention.

As shown in FIG. 3, in the IMT-2000 asynchronous system according to the present invention, the AAL2 channel access method between the base station and the control station allocates resources by receiving an AAL2 connection establishment request from an upper application 323 of the control station 32. And internal setting is performed (301 to 304).

Subsequently, the AAL2 connection establishment request message is transmitted to the base station 31 (305), the AAL2 channel information in the AAL2 connection establishment request message received by the base station 31 is read, the corresponding resource is checked and allocated, and internal configuration is performed ( 306 to 308).

Then, the base station 31 transmits the AAL2 connection establishment confirmation message to the control station 32, and the ALCAP 322 of the control station 32 transfers the AAL2 connection establishment confirmation primitive to the upper application program 323 (309 to). 311).

The operation of the AAL2 channel access method between the base station and the control station in the IMT-2000 asynchronous system having the structure as described above will be described in detail as follows.

First, in order to set up a traffic channel in an IMT-2000 asynchronous system, the upper application program 323 of the control station 32 performs resource allocation and modem setting for establishing a physical channel between a base station and a terminal, and then AAL2 channel. The AAL2 channel connection establishment request primitive is transmitted to the ALCAP 322 that performs the on / off function (301). In this case, the AAL2 channel establishment request primitive includes parameters such as a binding ID for identifying each channel and a required transmission rate.

The resources managed by the ALCAP 322 of the control station 32 for the AAL2 channel establishment / release are the physical link assignments, intra-link ATM virtual channel assignments (VPI / VCI), and multiplexing within the virtual channel that constitute the base station and control station interfaces. AAL2 channel allocation (CID) to be.

Subsequently, the resource management function of the control station 32 ALCAP 322 performs AAL2 resource allocation by the following algorithm (302).

<Procedure 1>

A physical link capable of transmitting the maximum capacity among the available capacities of the physical link connected between the control station and the target base station is selected by inputting a transmission rate required from an upper application program.

<Procedure 2>

Access to the control station database (DB) to extract the VPI value corresponding to the selected physical link. The table structure stored in the control station DB is as follows.

create table S_LinkVpiMappingTb (Persistent, Unique (linkNum), Primary Key (linkNum), linkNum integer, assignedVpi integer, ...);

The VPI corresponding to the physical link includes a traffic channel identifier.

<Procedure 3>

The voice / data delimiter is used as an input to assign VCI and CID that are not in use in each VCI + CID pool set during ALCAP initialization.

Meanwhile, after the resource allocation is performed, the internal connection is configured. That is, the LIU-B 321, which is an interface module within the control station, is controlled to convert the AAL2 channel on the Iub interface into an internal connection to the traffic processing element (THE). The LIU-B 321 receives the traffic channel information from the ALCAP 322, sets up the AAL2-AAL5 translation mapping table, and performs routing of the AAL2-AAL5 transformed and transformed cells (303 to 304).

When the internal setting of the control station is completed, an AAL2 connection establishment request protocol message carrying the allocated AAL2 channel information is transmitted to the base station ALCAP 312 (305). Here, the AAL2 connection establishment request protocol message is delivered through an ALCAP signaling channel.

Subsequently, upon receiving the AAL2 connection establishment request protocol message, the ALCAP 312 of the base station 31 extracts AAL2 channel information from the received message and performs necessary internal resource allocation and internal connection (306).

Here, the upper two bytes in the AAL2 Path ID field (AAL2 Path Id field) in the AAL2 connection establishment request protocol message are the VPI of the ATM VCC, and the lower two bytes are the VCI.

The ALCAP 312 of the base station 31 extracts the physical link information allocated by the ALCAP 322 of the control station 32 through the VPI. This is possible by configuring the VPI and the physical link mapping table in the base station DB. That is, the Iub interface module and the physical link number corresponding to the VPI are extracted by accessing the base station DB. The VPI and physical link mapping table configuration in the base station DB are as follows.

create table S_VpiLinkMappingTb (Persistent, Unique (vpi), Primary Key (vpi), vpi integer, linkNum integer, ...);

Meanwhile, in order to convert the AAL2 channel into the base station internal channel (AAL5) connecting the radio channel element (CE), the RNI, which is the Iub interface module 313 in the base station 31, is controlled, and the RNI controls the AAL2-AAL5 conversion mapping table. Maintaining and performing routing to the AAL2-AAL5 conversion and output link (307 ~ 308).

Subsequently, when the AAL2 resource setting is completed, the AAL2 connection establishment report primitive is transmitted to the upper application 311 in the base station 31 (309), and an AAL2 connection establishment confirmation protocol message is sent to the ALCAP 322 of the control station 32. Deliver 310.

Subsequently, after receiving the AAL2 connection establishment confirmation message, the ALCAP 322 of the control station 32 transmits a connection establishment confirmation primitive to the higher application program 323 to complete the AAL2 traffic channel establishment between the base station and the control station (311). ).

Hereinafter, a description will be given of a traffic bearer access procedure for AAL2 resource allocation (for forward traffic) and AAL2 resource setting (for reverse traffic) in an AAL2 channel access method between a base station and a control station in an IMT-2000 asynchronous system according to the present invention. Let's do it.

First, in the case of forward traffic, the traffic data transmitted from the traffic processing element is routed in the switch in the control station to reach the LIU-B 321, and then the LIU-B 321 reads the VPI of the received cell to determine the traffic channel (AAL2). To be converted to the signal channel (AAL5).

As a result of the classification, when it is necessary to convert to the traffic channel (AAL2), the memory for storing the mapping table (hereinafter referred to as CAM (Content Addressable Memory)) for AAL5 → AAL2 conversion is read and converted into the corresponding AAL2 channel. It also reads the output link number stored in the CAM and routes the converted AAL2 / ATM cell to the output link.

Subsequently, when the cell is received by the RNI 313 in the base station, the VPI of the received cell is read to distinguish between the AAL2 and AAL5 channels, and the AAL2 channel address (VPI + VCI + CID) is used to find the internal AAL5 channel address from the CAM, and then AAL2 → AAL5. Perform the conversion. The converted AAL5 / ATM cell is delivered to the radio channel element for connection with the terminal.

Next, for reverse traffic, the base station internal AAL5 / ATM cell transmitted in the radio channel element is converted to an AAL2 / ATM cell for the Iub interface in the RNI 313. At this time, like the LIU-B 321 in the forward direction, the RNI 313 distinguishes whether to convert to the signal channel (AAL5) or the traffic channel (AAL2), and if it is necessary to convert to the traffic channel (AAL2), AAL5 → AAL2. After the conversion, route to the output link. The cell received by the LIU-B 321 is converted to the AAL5 internal channel and forwarded to the traffic processing element through the control station internal switch as in the forward RNI function.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

According to the present invention as described above, by providing a resource management algorithm for the AAL2 channel setting / release in the base station and the control station ALCAP, it is possible to effectively set the AAL2 traffic channel.

In addition, the present invention provides an connection support and routing scheme for each interface module between the base station and the control station, thereby reducing the load of the interface module when the AAL2 traffic bearer is connected.

Claims (6)

A method of accessing AAL (ATM: 2 channels) between a base station and a control station applied to a wireless communication system, A resource allocation step of allocating resources for the AAL2 channel and performing internal configuration according to an AAL2 connection establishment request from the control station; A first forwarding step of forwarding an AAL2 connection establishment request message performed through the resource allocation to a base station; A resource setting step of setting a resource for an AAL2 channel and performing internal setting according to AAL2 channel information in an AAL2 connection establishment request message transmitted through the base station; And A second forwarding step of forwarding an AAL2 connection setup confirmation message to the control station after performing the internal setup AAL2 channel access method between the base station and the control station in a wireless communication system comprising a. The method of claim 1, The resource allocation step, Through the resource algorithm for AAL2 channel establishment / release, a physical link having the maximum spare capacity is selected, the VPI is allocated from the virtual path identifier table (VPI) corresponding to the selected link, and the VCI (Virtual Channel including the traffic channel identifier) is selected. Channel Identifier) + CID (Channel Identifier (AAL2)) AAL2 channel access method between a base station and a control station in a wireless communication system, characterized by allocating VCI and CID from the pool. The method of claim 1, The resource setting step, In order to extract the physical link allocated by the control station from the VPI value of the AAL2 Path ID field (AAL2 Path Id field) in the AAL2 connection establishment request message, the physical link and the VPI (Virtual) in the base station and the control station database (DB) are extracted. Path Identifier) AAL2 channel access method between a base station and a control station in a wireless communication system comprising a mapping table. The method according to any one of claims 1 to 3, Resource allocation process for the AAL2 channel, When the traffic bearer connection between the base station and the control station (for forward traffic), the traffic data transmitted from the traffic processing element is routed in the switch in the control station and forwarded to the Iub interface module (LIU-B) in the control station, the Iub in the control station The interface module includes: a first classification step of classifying whether to convert the received cell's VPI into a traffic channel AAL2 or a signal channel AAL5; According to the classification result of the first classification step, when it is necessary to convert to the traffic channel (AAL2), AAL5 → AAL2 is converted to the corresponding AAL2 channel by reading the memory storing the mapping table for conversion, and output link number stored in the memory Routing to read the converted AAL2 / ATM (Asynchronous Transfer Mode) cell to the output link; And When the cell is received by the IUB interface module (RNI) in the base station, the VPI of the received cell is read to distinguish the AAL2 or AAL5 channel, and the internal AAL5 channel address is found in the memory by the AAL2 channel address (VPI + VCI + CID). A third transfer step of converting from AAL2 to AAL5 and transferring the converted AAL5 / ATM cell to a radio channel element for connection with a terminal; AAL2 channel access method between the base station and the control station in a wireless communication system comprising a. The method of claim 4, wherein Resource setting process for the AAL2 channel, When a traffic bearer connection between the base station and the control station (for reverse traffic), the base station internal AAL5 / ATM cell transmitted from the radio channel element converts from the intra-base station Iub interface module (RNI) to an AAL2 / ATM cell for an Iub interface. A first transform step; A second classification step of discriminating whether to convert to a signal channel (AAL5) or a traffic channel (AAL2), such as the LIU-B of the forward traffic, in the Iub interface module in the base station; According to the classification result of the second classification step, if it is necessary to convert to the traffic channel (AAL2), after performing AAL5 → AAL2 conversion, routing to the output link, and the cell received by the LIU-B RNI function of the forward traffic A second conversion step of converting to the AAL5 internal channel as follows; And A fourth forwarding step of forwarding to the traffic processing element via the control station internal switch AAL2 channel access method between the base station and the control station in a wireless communication system comprising a. In a wireless communication system having a processor, A resource allocation function for allocating resources for the AAL2 channel and performing internal setting according to an AAL2 connection establishment request from a control station; A first forwarding function for forwarding an AAL2 connection establishment request message performed through the resource allocation to a base station; A resource setting function for setting a resource for an AAL2 channel and performing internal setting according to AAL2 channel information in an AAL2 connection establishment request message transmitted through the base station; And A second forwarding function for forwarding an AAL2 connection setup confirmation message to the control station after performing the internal setup A computer-readable recording medium having recorded thereon a program for realizing this.