KR20030018451A - Test method for e1/t1 link using asynchronous transfer mode network - Google Patents

Abstract

PURPOSE: A method for testing a trunk line of an ATM(Asynchronous Transfer Mode) network is provided to transceive a test cell on a communication channel, so as to check failures of the communication channel between an RNC(Radio Network Controller) and a node B. CONSTITUTION: A test cell is transmitted to a slave in order to test a trunk line, and a cell is received from a communication channel and the received cell is outputted(S1-S3). Whether the received call is the test cell re-transmitted from the slave is decided, to increase a loop count or a normal count(S4-S6). Whether the received cell is a dual cell or a cell in which a loss or an error is generated is decided, to increase a dual count, a loss count or an error count(S7-S13). And the state of the trunk line is reported by the information of the plurality of counts(S14,S15).

Description

TEST METHOD FOR E1 / T1 LINK USING ASYNCHRONOUS TRANSFER MODE NETWORK}

The present invention relates to a method for testing an E1 / T1 relay line of an AMT network, and more particularly, to test a performance of a communication channel of an E1 / T1 relay line in an ATM network by transmitting and receiving a test cell on a communication channel. It is about a test method.

In general, the RNC and the RB of the ATM network achieve E1 / T1 matching.

The E1 / T1 matching is performed by a printed circuit board assembly (PBA) mounted on a radio network controller (RNC) and a node-ratio.

The printed circuit board assembly (PBA) has 16 E1 / T1 matches and one STM-1 match.

The 16 E1 / T1 matches are for providing an E1 / T1 relay line path between a Radio Network Controller (RNC) and a node-ratio, and the STM-1 match is for interworking with a higher network in each system.

In general, the printed circuit board assembly (PBA) provides an ATM pass for cells coming from the ST-1 matching unit, transmits to the E1 / T1 matching unit through cell routing, and provides a reverse path.

However, in the prior art as described above, since the length of the relay line forming the E1 / T1 match can be from several hundred meters to several kilometers, an error occurs during data transmission or an error due to an abnormality of the relay line.

Therefore, the AMT system manager needs to check an error occurring during data transmission or detect an abnormality of the relay line.

Accordingly, the present invention was devised in view of the necessity as described above. The relay line of the ATM system manager is checked by transmitting and receiving a test cell on a communication channel to check for an abnormality of a communication channel between a Radio Network Controller (RNC) and a node-non-B. The purpose is to provide a trunk line test method of ATM network with improved management.

1 is a flow chart showing the operation sequence of the relay line test method of the AMT network of the present invention.

Figure 2 is an exemplary view showing an embodiment of a relay line of the AMT network to which the test method of Figure 1 is applied.

FIG. 3 is a detailed diagram illustrating an internal configuration of a printed circuit board assembly (PBA) in FIG. 2.

The present invention for achieving the above object, the first step for transmitting a test cell to the slave side for the relay line test and receiving the cell from the communication channel and outputs a receiving cell; Determining whether the receiving cell is a test cell retransmitted by the slave to increase a loop count or a normal count; Determining whether the receiving cell is a cell that is duplicated or lost or an error and increasing a duplicate count, a lost count or an error count; And performing a fourth step of reporting the state of the relay line by the information of the plurality of counts.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an operation flowchart of a relay line test method of the ATM network of the present invention, as shown in the first step of transmitting a test cell to a slave side for receiving a relay line test and receiving a cell from a communication channel to output a receiving cell ( S1 to S3); Determining whether the receiving cell is a test cell retransmitted by the slave to increase a loop count or a normal count (S4 to S6); Determining whether the receiving cell is a cell that is duplicated or lost or an error occurs, thereby increasing a duplicate count, lost count, or error count (S7 to S13); A fourth step (S14, S15) for reporting the state of the relay line by the information of the plurality of counts.

Hereinafter, a structure of a test cell used for a physical network and a relay line test in which a method for testing a relay line between a radio network controller (RNC) and a node-to-node is implemented will be described in detail with reference to FIGS. 2 and 3. same.

First, in order to test the relay line between the RNC (Radio Network Controller) 1 and the node-ratio (2), a printed circuit board assembly (PBA) 30, 40 is respectively applied to the RNC and the RB. Mount it.

Here, the PBA (Printed Circuit Board Assembly) mounted on the Radio Network Controller (RNC) and the Node-B is as follows.

The printed circuit board assembly (PBA) includes a block constituting an E1 match and a block constituting an STM-1 match in an AT network.

The block constituting the E1 match receives the cell output from the STM-1 matcher 17 and the transmission cell output from the first-in, first-out 15 to execute the ES function of the AAL protocol controller 13. It consists of an STM-1 receiving interface 12 that performs E1 matching.

The block constituting the STM-1 matching performs the SL function of the AAL protocol controller 22 on the cells output from the E1 matcher 10 to filter the receiving cells in the AT communication channel and to match the STM-1 matching. It consists of an STM-1 transmission interface 21 matching with the group 17.

For convenience of description, it is assumed that PBA (Printed Circuit Board Assembly) mounted in RNC (Radio Network Controller) is A, and PBA (Printed Circuit Board Assembly) mounted in Node-B is assumed.

In addition, the structure of the test cell used in the present invention is as follows.

typedef structure

{

unsigned int test_type;

unsigned int signal ID;

unsigned int message ID;

unsigned int seq_num;

unsigned byte * pattern;

} pattern_msg;

Here, looking at each data constituting the test cell, the test type (test_type) is the data to distinguish whether the test cell for testing the state of the relay line is periodically generated or generated by the user's command, the signal ID (Signal ID) is data for distinguishing whether a received cell is a test cell, and Message ID (Data ID) is data for distinguishing whether a test cell transmitted from A is a test cell received and retransmitted by a sequence number (Seq_num). ) Is data representing the serial number of the test cell, and the message pattern is a message carried in the test cell.

Hereinafter, the relay line test method of the AMT network of the present invention will be described.

First, the user decides whether to generate the test cells periodically or only when needed.

The criterion to judge this is to compare the test types.

Then, A increases the sequence number to the side and transmits a test cell.

Upon receiving the test cell, the UE changes the message ID and retransmits the message back to the client.

The AB receives the AT cell on the communication channel of the AT network, and if it is determined that the cell is a test cell, outputs the receiving cell and determines the characteristics of the receiving cell.

Here, a plurality of printed circuit board assemblies (PBAs) are mounted in a radio network controller (RNC) or a node-ratio, and a test cell transmitted from the AB is circulated or lost on an ATM communication channel until received and retransmitted at. do.

In detail, the test cell transmitted from A to A may cycle through a transmission / reception path of the RNC (Radio Network Controller) in which the A is mounted, and may be received again by A. Assume this cell is a loop cell.

The criterion for determining the loop cell is whether the message ID is changed in the test cell, and the loop cell if the message ID is not changed.

If the receiving cell is determined to be the loop cell, A increases the loop count.

In another case, a test cell transmitted from A to A may receive a and change the message ID to retransmit to A. Assume this cell is a normal cell.

The criterion for determining the normal cell is whether the message ID is changed in the test cell, and the test cell received after the message ID is changed is the normal cell.

If the receiving cell is determined to be the normal cell, A increases the normal count.

In another case, the sequence number of the test cell currently received at the former and the test cell previously received may be the same. Assume this cell is a duplicate cell.

The criterion for determining the duplicated cell is the difference between the sequence number in the currently received test cell and the sequence number in the previously received test cell. Therefore, when the difference of the sequence number is 0, it is determined that the duplicated cell has occurred.

If the receiving cell is determined to be the duplicate cell, A increases the duplicate count.

In another case, it is normal that the sequence number of the test cells received by the pack increases sequentially but otherwise the transmitted test cells are lost. Assume this cell is a missing cell.

The criterion for determining the lost cell is to determine whether the difference between the sequence number in the currently received test cell and the sequence number in the previously received test cell is two or more.

If the receiving cell is determined to be the lost cell, A increases the lost count.

Finally, the message pattern of the test cell may cause an error during transmission between A and A. Assume this cell is an error cell.

The criterion for determining the error cell is to compare the message pattern transmitted from A to the message pattern retransmitted by A.

If the two message patterns match, it is determined to be normal, and if they do not match, it is determined that an error has occurred.

If the receiving cell is determined to be the error cell, A increases the error count.

The determination result is then reported to the user when the number of test cells to be used for the relay line test reaches a predetermined number set by the user.

As described in detail above, since the present invention continuously monitors the state of the communication channel in the ATM network through a test cell in a relay line section having a relatively long transmission distance, there is an effect of increasing network efficiency.

Claims (4)

Transmitting a test cell to a slave side for a relay line test, receiving a cell from a communication channel, and outputting a receiving cell; Determining whether the receiving cell is a test cell retransmitted by the slave to increase a loop count or a normal count; Determining whether the receiving cell is a cell that is duplicated or lost or an error and increasing a duplicate count, a lost count or an error count; And a fourth step of reporting the state of the relay line by the information of the plurality of counts. 2. The apparatus of claim 1, wherein the test cell comprises: a test type that serves as a reference for determining whether a test cell for testing a state of a relay line is periodically generated or generated by a user's command only when necessary; A signal ID as a reference for outputting a receiving cell by determining whether the received cell is a test cell; A message ID serving as a reference for increasing a loop count or a normal count by determining whether the slave has received and retransmitted the test cell; A sequence number indicating the serial number of the test cell; Relay line test method of the AMT network, characterized in that consisting of a message pattern for recording a message. The method of claim 2, wherein the sequence number is increased to increase the duplicate count if the difference between the sequence number of the currently received test cell and the sequence number of the previously received test cell is increased to increase the duplicate count or the lost count. The relay line test method of ATM network, characterized in that to increase the count. The relay line test method of claim 2, wherein the message pattern increases an error count when the message pattern transmitted to the slave side and the message pattern received from the slave side are different.