KR20020084517A - Method for Resource Assignment with Grouping of Destination using ATM Adaption Layer 2 Protocol - Google Patents

Abstract

PURPOSE: A method of allocating resources by a destination grouping using an AAL2(ATM Adaptive Layer2) protocol is provided to configure IDs by destination nodes, to transmit the IDs to source nodes while setting an AAL2 call, and to group cells having the same destination IDs in the source nodes, to transmit resources, thereby reducing unnecessary node to increase switch capacity. CONSTITUTION: Cells(1,2,3,4) of an ATM cell(200) are ATM cells corresponding to data bearers of set connections(1,2,3,4). The cells(1,3) are supposed to have destinations outputted to a port 'A'. The cells(2,4) are supposed to have destinations outputted to a port 'B'. A transmission node(210) is given a destination group ID by a connection request, and multiplexes cells only having the destination group ID. The multiplexed cells reach an ATM switch(220). A demultiplexing process is omitted for switching the ATM switch(220).

Description

Method for Resource Assignment with Grouping of Destination using ATM Adaption Layer 2 Protocol}

The present invention relates to a resource allocation method using the destination grouping in the A2 mode of the asynchronous transmission mode, and a computer-readable recording medium recording a program for realizing the method.

The Asynchronous Transfer Mode (hereinafter referred to as "ATM") technology uses a fixed size packet, a 53-byte cell consisting of a 5-byte header and a 48-byte payload. .

The AAL2 (ATM2) protocol, which was studied in the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) SG13 and determined as the I.363.2 standard, is an efficient transmission in the application of low-speed, delay-sensitive short packets. It was prescribed to provide.

In addition, AAL2 is designed to efficiently transmit voice data in an ATM-based transmission path and multiplexes multiple users in one ATM cell. That is, when a transmitting node has a cell that is not full of payload (having a size of 48 bytes) of one cell, these cells are collected and combined into one cell to fill 48 bytes as much as possible, and then sent to the next node. This replaces the transmission of several cells that are not full with one cell transmission, and consequently saves link bandwidth.

On the other hand, the node of the receiving end demultiplexes the multiplexed cells again and separates them into the original cells. This separated cell is transmitted to each destination according to the next destination path. At this time, for cells going to the same destination, the process of reducing several cells to one cell is repeated through a multiplexing process.

A resource allocation method using the AAL2 scheme of the conventional asynchronous transmission mode as described above will be described in more detail with reference to FIG. 1.

1 is a diagram illustrating an embodiment of a resource allocation method using a conventional AAL2 scheme in asynchronous transmission mode.

In the figure, "100" is an ATM cell, "110" is a transmitting node, "120" is an ATM switch, "121, 123" is a demultiplexer, "122, 124" is a multiplexer, "131" is a port A, and "132" represents Port B, respectively.

Cells 1, 2, 3, 4, ..., N (110) are ATM cells corresponding to data bearers of the data transmitter connected to each cell, and contain useful data of the user.

For convenience, it is assumed that cells 1 and 3 have a destination output to port A 131 of the ATM switch 120, and cells 2 and 4 have a destination output to port B 132 of the ATM switch 120. .

First, since the transmitting node 110 has no information about the destination of the switch, the transmitting node 110 bundles arbitrary cells and multiplexes them into one cell for transmission. That is, although cells 1 and 2 are directed to different destinations, cells 1 and 2 are multiplexed and transmitted to one cell, and cells 3 and 4 are also multiplexed and transmitted to one cell.

The ATM switch 120 receiving the multiplexed cells demultiplexes the multiplexed cells in the demultiplexer 121 and divides the multiplexed cells into respective cells (cell 1, cell 2, cell 3, and cell 4). This is the process for switching cells according to their destination.

Next, cells 1 and 3 gathered at the destination port A 131 through switching are transmitted from the multiplexer 122 to one cell through a multiplexing process for transmission.

Similarly, cells 2 and 4 collected at the destination port B 132 through switching are transmitted from the multiplexer 124 to a single cell through a multiplexing process for transmission.

However, the multiplexing / demultiplexing process has the following problems.

First, assume that there are cells that are transferred from one node to the third node via the next node.

If the cells originating from the first node have no information about the destination, the resulting cells will be multiplexed without any principle about the destination. If the cells destined for different destinations are multiplexed into one cell, the intermediate node must demultiplex. After the process, the combined cells are separated into their respective cells. Each of the separated cells should send the cell to a different destination.

Therefore, the process of demultiplexing the multiplexed cells into each cell and then transmitting the corresponding cells to each destination again and multiplexing again acts as an overhead of the ATM switch part, resulting in increased performance and reduced capacity of the ATM switch. There was a problem that became a factor.

The present invention has been proposed to solve the above problems, and configures an identifier for each destination node and transmits it to a source node at the time of AAL2 call setup, and cells having the same destination identifier in the source node receiving the information It is an object of the present invention to provide a method of allocating resources by destination grouping using an asynchronous transmission mode adaptive layer 2 protocol capable of grouping resources and a computer-readable recording medium recording a program for realizing the method.

1 is a diagram illustrating an embodiment of a resource allocation method using the AAL2 scheme of a conventional asynchronous transmission mode.

2 is a diagram illustrating an embodiment of a resource allocation method using destination grouping in the AAL2 mode of the asynchronous transmission mode according to the present invention.

3 is a signal flow diagram of an embodiment of a method for establishing a destination connection in an AAL2 mode of asynchronous transmission mode according to the present invention;

* Explanation of symbols for the main parts of the drawings

200: ATM cell 210: transmitting node

220: ATM switch 221, 222: demultiplexer

223, 224: Multiplexer 231: Port A

232: Port B

In the method of the present invention for achieving the above object, in the resource allocation method by destination grouping using the asynchronous transmission mode adaptive layer 2 protocol, the source node receives a connection establishment request from the user or neighbor node to establish a connection with the destination node Receiving a destination group identifier by a first step; A second step of multiplexing by grouping cells having the same destination group identifier; And a third step of transmitting the multiplexed cells to a destination.

On the other hand, the present invention, a communication system having a large capacity processor, a first function for receiving a connection establishment request from a user or a neighbor node to establish a connection with a destination node and to receive a destination group identifier; A second function of multiplexing cells having the same destination group identifier among the cells to be transmitted; And a computer readable recording medium having recorded thereon a program for realizing a third function of transmitting the multiplexed cells to a destination.

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.

2 is a diagram illustrating an embodiment of a resource allocation method using destination grouping in the AAL2 method of the asynchronous transmission mode according to the present invention.

In the figure, "200" is an ATM cell, "210" is a transmitting node, "220" is an ATM switch, "221, 222" is a demultiplexer, "223, 224" is a multiplexer, "231" is a port A, and "232" represents port B, respectively.

First, cells 1, 2, 3, and 4, which are ATM cells 200, are ATM cells corresponding to data bearers of connection 1, 2, 3, and 4, respectively, and cells 1 and 3 indicate destinations output to port A of the switch. It is assumed that cells 2 and 4 have a destination output to port B of the switch.

Unlike in FIG. 1, the transmitting node 210 is given prior information on the destination of the ATM switch 220, that is, a destination group identifier (ID) according to a connection request. Only multiplex the cells with the destination group identifier.

That is, since cells 1 and 3 are directed to the same destination, they have the same destination group identifier, and cells 1 and 3 are multiplexed to the same cell. Since cells 2 and 4 are directed to the same destination, they have the same destination group identifier. , 4 is multiplexed.

As described above, since the cells multiplexed at the transmitting node 210 and reached the ATM switch 220 are multiplexed only to cells having the same destination, the demultiplexing process may be omitted for switching the ATM switch 220.

Therefore, it can be processed like one cell that is not multiplexed. Cells arriving at destination port A 231 and port B 232 are likewise transmitted to the destination without additional multiplexing.

3 is a signal flow diagram according to an embodiment of a method for establishing a destination connection in the AAL2 mode of the asynchronous transmission mode according to the present invention.

As shown in FIG. 3, in the AAL2 scheme of the asynchronous transmission mode according to the present invention, the resource allocation method using the destination grouping includes: first, the source ATM node 310 receives a connection establishment request from a user or from an adjacent node. A connection establishment request is made to the ATM node 320 (311). At this time, destination address information for the end user is included. Here, the source ATM node is a base station or exchange and the destination ATM node is a base station controller.

The destination ATM node 320 receiving the connection establishment request may use the destination address information transmitted from the source ATM node 310 to know which one of its output ports to select. That is, a destination group identifier can be assigned to this connection request.

The allocated destination group identifier is transmitted to the source ATM node 310 by being included in the AAL2 connection establishment request message (321).

The source ATM node 310 receiving the AAL2 connection establishment request message sends a response to the received AAL2 establishment request back to the destination ATM node 320 to complete the setup process.

Meanwhile, the 3rd Generation Partnership Project (3GPP), a European-style IMT-2000 standardization group, recommends using the Q.2630.1 signaling protocol when data bearers are serviced by AAL2 in 3rd generation asynchronous systems.

In the case of the asynchronous IMT-2000 system, the source ATM node may be a base station controller, and the destination ATM node may be a base station controller including an ATM switch. In this case, the connection establishment request message to the destination ATM node may be a message in the wireless configuration process. The AAL2 connection establishment request message is replaced, and the response to the AAL2 establishment request is in the form of Establish Confirm.

However, since existing Q.2630.1 messages cannot be assigned the same destination group identifier as the proposed contents, additional fields must be defined and used.

In the case of a radio incoming call, the source ATM node becomes a switch and the destination ATM node becomes a base station controller.

On the other hand, although the present invention uses the asynchronous transmission mode (ATM) as a basic transmission technology, it is apparent to those skilled in the art that the present invention is applicable to all systems that support the multiplexing function between each user. Do.

According to the present invention, a destination can be grouped for each node for an Asynchronous Transfer Mode (ATM) connection resource (for example, CID, VPI, VCI, etc.) to be transmitted to the source node that has requested the information allocation when the AAL2 call is established. The source node, which is the subject of the transmission receiving the information, multiplexes only cells going to the same destination, that is, cells belonging to the same group. At this time, the intermediate node transmits the cell to the destination as it is without having to demultiplex the cell. In this case, since the process of demultiplexing the cell is omitted, the load of the switch can be greatly reduced, and when the grouping is not performed, the demultiplexing process can be completely omitted in the switch if the transmission is performed without multiplexing.

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

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 apparent to those of ordinary knowledge.

The present invention as described above has the effect of increasing the capacity of the switch by reducing the unnecessary load due to the multiplexing / demultiplexing process according to the destination at the switch stage to increase the efficiency of the ATM transmission path.

Claims (5)

In the resource allocation method by destination grouping using the asynchronous transmission mode adaptive layer 2 protocol, A first step in which a source node receives a connection establishment request from a user or a neighbor node, establishes a connection with a destination node, and receives a destination group identifier; A second step of multiplexing by grouping cells having the same destination group identifier; And A third step of transmitting the multiplexed cells to a destination Resource allocation method by destination grouping comprising a. The method of claim 1, The first step is, A fourth step of the source node requesting connection establishment by transmitting a connection establishment request message including destination information; A fifth step of receiving, from the destination node, an AAL2 (ATM Adaptation Layer 2) connection establishment request message including a destination group identifier in response to the connection establishment request; And A sixth step of transmitting an AAL2 establishment response message to the destination node in response to the AAL2 (ATM Adaptation Layer 2) connection establishment request message; Resource allocation method by destination grouping comprising a. The method of claim 2, The destination group identifier of the fifth step is A resource allocation method by destination grouping, wherein the destination output port is determined by using the received destination information and the destination group identifier is assigned. The method according to claim 1 or 2, The destination node, Substantially, resource allocation method by destination grouping, characterized in that the base station controller. In a communication system having a large capacity processor, A first function receiving a connection establishment request from a user or an adjacent node, establishing a connection with a destination node, and receiving a destination group identifier; A second function of multiplexing cells having the same destination group identifier among the cells to be transmitted; And A third function of transmitting the multiplexed cells to a destination A computer-readable recording medium having recorded thereon a program for realizing this.