KR100251580B1 - Apparatus and method for controlling the traffic of protocol conversion equipments - Google Patents

Abstract

PURPOSE: An apparatus and method for controlling traffic in a protocol conversion equipment is provided to reduce loss of data and re-transmission request generated due to limited bandwidth of wide band communication network. CONSTITUTION: A transfer waiting table is for stores destination addresses, request bandwidth, delay time after registration, transmission attempt numbers and so on for service terminals requesting data transfer. A transmitting band assignment table is for registering the destination addresses and the assigned transmitting bandwidth for the service terminals. A receiving band assignment table is for registering the destination addresses and the assigned receiving bandwidth for the service terminals which response to the request of the transmitting band assignment.

Description

Traffic control device and method of protocol converter

The present invention relates to a hybrid protocol converter for interworking existing terminals through a BISDN network, and more particularly, to a traffic control device and a method of the hybrid protocol converter.

The hybrid protocol converter accepts Ethernet LAN matching, N-ISDN terminal matching, and DS3 terminal matching functions as subscriber functions, and interoperates services of these subscriber functions through a B-ISDN network. Have.

Evolution to broadband communication networks is inevitable in order to provide higher quality communication services at lower prices by efficiently using network resources in separate communication network systems such as voice data and video.

In addition, in order to smoothly introduce and expand the broadband communication service, it is important to develop a matching device capable of integrating an existing terminal and a communication network with the broadband communication network as well as a broadband switching and transmission device.

However, when existing terminals connected to the broadband matching device attempt to access a specific matching device connected to the broadband communication network at a moment, the receiving side matching device discards additional data other than the bandwidth that it can process. .

Therefore, it is possible to prevent this by increasing the capacity of the memory unit of the matching device in case the data is congested, but there is a problem of causing a memory waste and delay caused by only the traffic maximum.

Accordingly, an object of the present invention is to provide an apparatus capable of controlling traffic in a hybrid protocol converter.

Another object of the present invention is to provide a method for controlling traffic in a hybrid protocol converter.

In order to achieve the above object, it has local area network, narrow band network terminal and optical transmission terminal matching function as subscriber function, interworking services of subscriber function through broadband communication network, transmission standby table for transmission control, transmission band The traffic control method of the hybrid protocol conversion apparatus having an allocation table and a reception band allocation table,

Receiving transmission request data from an arbitrary service terminal, storing the data in an input buffer, and registering information about the transmission request in the transmission waiting table; searching the transmission waiting table to search for the transmission requesting service; Selecting a service terminal having the greatest delay time among the terminals and having a transmission attempt number less than or equal to a set value, and checking whether transmission band allocation is possible, and when the transmission band allocation is possible, assigning transmission band allocation to the partner hybrid protocol converter. Requesting and registering a reception bandwidth in the reception bandwidth allocation table when a response message is received from the partner hybrid protocol converter and transmitting data stored in the input buffer to the partner hybrid protocol converter. Characterized in that made.

1 is a diagram illustrating a hybrid protocol converter interworking with a broadband communication network according to the present invention and terminals connected to the converter;

2 is a detailed block diagram of a hybrid protocol conversion apparatus according to the present invention.

3 is a control flowchart for registering in a transmission request table for any transmission request according to the present invention.

4 is a control flowchart for attempting a bandwidth allocation request to a counterpart protocol conversion device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding the reference numerals to the components of each drawing, the same components have the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 shows a hybrid protocol converter integrated into a broadband ISDN and a plurality of communication terminals connected to the converter according to the present invention.

Referring to FIG. 1, the hybrid protocol converter has an Ethernet LAN terminal, an N-ISDN terminal, and a DS3 video service as a subscriber function, and the services of the subscriber function are provided through a broadband communication network (BISDN). Interlocked.

2 is a detailed block diagram of a hybrid protocol converter.

It is composed of five blocks, and main controller and LAN matching unit 211 performs system processing function, Ethernet LAN matching function, CPCS PDU (Common Part Convergence Sublay Protocol Data Unit) generation and transmission function, and high speed data transmission and reception function. .

The BISDN matching unit 212 performs a broadband communication network (B-ISDN) matching function of the hybrid protocol changer, and performs a cell multiplexing and demultiplexing function, an ATM adaptive layer (AAL) 3/4, and an ALL 5 function.

Here, the AAL 3/4 function refers to a function of delivering class C and D service data having a variable bit rate, and the service provided by the AAL 3/4 is divided into two types, a message mode and a stream mode. . In addition, the AAL 5 has a sublayer of SAR, CPCS, and SSCS, similar to the AAL 3/4, and a service mode is divided into a message mode and a stream mode, and a delivery method includes a delivery guarantee method and a delivery non-guaranteed method. The difference from AAL 3/4 is that multiplexing is not supported.

BISDN physical layer unit 213 performs ATM physical layer function through STM-1 class optical link, and operates OAM (Operating, Administration and Maintenance) cell set in given VC (vertical circuit) unit. Is transmitted and received transparently, and in case of reception, the control unit 211 is notified that the OAM cell has been received.

The CBR matching unit 214 converts the source data into an ATM cell and converts the source data into a multiplexed ATM cell in order to match a BRI (2B + D) and a DS3-class CBR (constant bit rate) traffic source with an ATM.

Here, the CBR matching unit 214 processes a data source having CBR characteristics using the AAL-1 protocol, and includes simple switching for multiplexing and demultiplexing through VPI / VCI based ATM cell header processing. In particular, for N-ISDN matching, it processes not only the N-ISDN physical layer but also the protocols of layer 2 and layer 3, and the DS3-class codec does not have any protocol function other than the physical layer.

In addition to providing one port for connecting the console to the LAN matching unit 211 for operation, the hybrid protocol converter is connected to the CBR matching unit 214 that is responsible for N-ISDN and video (DS3 codec) matching. The operator interface unit 215 is provided. The input unit used in the operator interface unit 215 is a keypad and displays user information through the VFD panel.

Looking at the table implemented for the present invention as follows.

Table 1 is a transmission wait table for registering a request bandwidth for each destination address for a service having a data transmission request.

Table 2 is a transmission bandwidth allocation table for registering transmission allocation bandwidth for each destination address for a service that can allocate transmission request bandwidth.

Table 3 is a reception band allocation table for registering a reception direction allocation bandwidth for each destination address by analyzing a response message from the other party.

Hereinafter, one example of Table 1, Table 2, and Table 3 will be described.

Terminal ID Destination address Bandwidth Delay time after registration Number of transmission attempts

Terminal ID Destination address Allocated Bandwidth (Tx)

Terminal ID Destination address Allocated Bandwidth (Rx)

In this case, when the transmission bandwidth allocation is approved by the terminal registered in the transmission standby table of Table 1, the terminal is deleted from Table 1 and registered in the transmission bandwidth allocation table of Table 2. In addition, when the terminal registered in the transmission band allocation table receives a response message from the other side, the terminal registers the data with the reception direction allocation bandwidth in the reception band allocation table as shown in Table 3 below.

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

FIG. 3 illustrates a process for a hybrid protocol conversion apparatus receiving a transmission request data from a specific terminal, storing the transmission request data in the input buffer data, and then registering an entry thereof in the transmission waiting table of Table 1. Referring to FIG.

Referring to FIG. 3, the controller 211 determines whether there is a transmission request from a specific terminal in step 313. At this time, when there is the transmission request, the control unit 211 proceeds to step 313. When there is no transmission request, the control unit 211 continuously checks whether there is the transmission request.

The control unit 211 checks the transmission request and proceeds to step 313 to store data to be transmitted to the input buffer. In step 315, the control unit 211 stores the destination address and the requested bandwidth in the transmission wait table, and terminates the program for registering the service terminal with the transmission request.

4 is a control flowchart illustrating a process of making a bandwidth allocation request to a counterpart hybrid protocol conversion apparatus in consideration of a delay time and a transmission attempt number after registering an entry for which transmission bandwidth allocation is requested by checking Table 1 (transmission wait table). to be.

Referring to FIG. 4, the controller 211 searches for the delay time of the transmission wait table (Table 1) in step 411 and selects the service terminal having the largest delay time in step 413. In step 415, the controller 211 determines whether the number of transmission attempts of the entry having the greatest delay time is 3 or more (set value). In this case, if the number of transmission attempts is three or more times, the control unit 211 proceeds to step 439. If the transmission number is not three or more times, the control unit 211 proceeds to step 417.

The controller 211 proceeds to step 417 to access the transmission bandwidth required by the terminal from the transmission standby table (Table 1). The controller 211 checks whether transmission band allocation for data transmission of the service terminal is possible.

Here, an example of the check will be described. First, the control unit 211 accesses the transmission band allocation table shown in Table 2 to add all the allocated bandwidths, and then subtracts the value from the transmission bandwidth of the protocol conversion apparatus. The subtracted value satisfies the transmission bandwidth requested by the service terminal.

In this case, if the transmission bandwidth requested by the service terminal does not satisfy the control unit 211 proceeds to step 411 to search for the transmission bandwidth allocation table again, and if the transmission bandwidth required by the service terminal satisfies the control unit 211 421 Proceed to step.

The controller 211 proceeds to step 421 and registers a destination address and a transmission bandwidth for a transmission request of the service terminal in a transmission band allocation table (Table 2). Of course, at this time, the entry for the service terminal is deleted from the transmission standby table of Table 1.

In step 423, the controller 211 generates a transmission bandwidth allocation request message and transmits it to the counterpart protocol conversion apparatus through the BISDN physical layer unit 213. After transmitting the transmission bandwidth allocation request message, the controller 211 starts the timer in step 425 and checks whether the set time elapses in step 427. At this time, if the set time is detected, the controller 211 proceeds to step 441. If the set time is not detected, the controller 211 proceeds to step 429.

Since the set time has not elapsed, the controller 211 proceeds to step 429 and checks whether there is a response message from the counterpart prototype converter. In this case, if the response message is received, the controller 211 proceeds to step 431. If the response message is not received, the controller 211 proceeds to step 425 to continue driving the timer.

After detecting the response message and proceeding to step 431, the controller 211 analyzes the response message and registers the destination address and the reception allocation bandwidth in the reception bandwidth allocation table (Table 3) in step 433. The controller 211 allocates a reception bandwidth in step 435.

The controller 211 converts the data stored in the input buffer into an ATM cell through the BISDN matching unit 212 and transmits the cell to the BISDN through the BISDN physical layer unit 213.

Meanwhile, in step 427, the control unit 211 detects the elapse of the set time and proceeds to step 441. The controller 211 increases the number of transmission request attempts in the transmission wait table (Table 1) by one and terminates the program.

Referring to FIG. 4, the control processes are continuously performed at predetermined time intervals, and accordingly, the transmission standby table, transmission band allocation table, and reception band allocation table are continuously updated.

As described above, since the present invention can transmit data only when bandwidth between both terminals is allocated, overflow traffic is controlled through the hybrid protocol converter before being transmitted to the broadband communication network (BISDN). Data loss and retransmissions caused by the limited bandwidth can be reduced.

Claims (3)

In the traffic control device of the hybrid protocol conversion apparatus having a matching function between the terminal of the local area network and the narrowband communication network and the optical transmission terminal as a subscriber function, and the services of the subscriber function to interwork through a broadband communication network, A transmission standby table for storing a destination address, a requested bandwidth, a delay time after registration, and a transmission attempt number for a service terminal requesting data transmission; A transmission band allocation table for registering a destination address and a transmission allocation bandwidth to a service terminal capable of allocating transmission bands in the transmission request table; And a reception band allocation table for registering a destination address and a reception allocation bandwidth for a service terminal having a response message for a transmission band allocation request among the service terminals of the transmission waiting table. . A subscriber function has a matching function between a terminal of a local area network and a narrowband communication network and an optical transmission terminal, and the services of the subscriber function interoperate with each other through a broadband communication network, and a transmission standby table, a transmission band allocation table, In the traffic control method of a hybrid protocol conversion apparatus having a reception band allocation table, Receiving transmission request data from an arbitrary service terminal, storing the data in an input buffer, and registering information regarding the transmission request in the transmission waiting table; Searching the transmission wait table to check whether transmission band allocation is possible by selecting a service terminal having the largest delay time among the service terminals that are requesting transmission and having a transmission attempt frequency less than or equal to a set value; Requesting transmission band allocation to a counterpart hybrid protocol converter when the transmission band allocation is possible; Registering a reception bandwidth in the reception bandwidth allocation table when a response message is received from the partner hybrid protocol converter, and transmitting data stored in the input buffer to the peer protocol converter; A traffic control method of a protocol converter. The method of claim 2, The transmission band allocation check process, After subtracting all the transmission bands of the terminals registered in the transmission band allocation table from the total transmission bandwidth of the hybrid protocol conversion apparatus, and checking whether the value satisfies the transmission bandwidth required by the selected service terminal. Traffic control method of a protocol converter characterized in that consisting of a process.

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