KR100502610B1 - ATM cell timer device, control method and conjunction device - Google Patents

Abstract

The present invention relates to an apparatus and a method for guaranteeing the quality of service (AQ2) of an ATM Adaptation Layer 2 (AAL2) type ATM cell of a wireless communication system. The present invention relates to an apparatus capable of processing information in a controller and stored in a timer content addressing memory. If there is an area to do, the information is received from the input first-in, first-out memory. Compares the input information with the timer contents addressing memory. As a result of the comparison in the second step, when the input information is in the timer content addressing memory, the counter is initialized. In the third step, the counter is initialized and then operated again. In the fourth step, it is checked whether the counter has reached a threshold. As a result of the comparison in the fifth step, when the threshold value of the counter is reached, corresponding information stored in the timer content addressing memory is output. By doing so, it is possible to guarantee QoS of the AAL2 type ATM cell while reducing the load on the central processing unit.

Description

ATM cell timer device, control method thereof, and base station / control station matching device having the same {ATM cell timer device, control method and conjunction device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to an apparatus and a method for guaranteeing a quality of service (QoS) when transmitting an ATM Adaptation Layer Type 2 (AAL2) type ATM cell of a wireless mobile communication system.

Hereinafter, a conventional technology will be described with reference to the accompanying drawings.

1 is a diagram illustrating a simple configuration for explaining a general wireless communication system.

Referring to FIG. 1, a plurality of mobile stations (UE), such as a personal portable terminal 1, a wireless communication equipment 2, and the like are transmitted to a radio signal base station, and the radio signal is transmitted to a base station Node-B, 100. ) Converts into a suitable signal for wired transmission, and transmits data to the control station through the T1 / E1 transmission line connecting the base station 100 and the control station 110.

The control station then transmits data from several base stations to the mobile telecommunication core network. At this time, the optical communication between the control station 110 and the mobile communication core network for high-speed, large-capacity data transmission.

In order to develop various multimedia services into a next-generation mobile communication system in the conventional mobile communication system with voice-oriented services, variable length data transmission and large data transmission are required.

However, compared to the increase in the amount of data to be transmitted. Radio resources are limited, so they are better than high speed transmission. There is a need for an efficient use of radio resources.

As shown in Fig. 2, the AAL2 type ATM cell has a structure including a plurality of such short cells, using a cell having a small amount of data as a short cell.

In addition, an AAL2 type ATM cell has a start field (STF) of 1 byte representing the first short cell position information in the ATM cell, and has a 6-bit offset field (OSF), a 1-bit sequence number (SN), and a 1-bit It consists of P (base parity of STF).

Each number in parentheses in the structure diagram represents the number of bits of the corresponding data.

Therefore, the AAL2 type ATM cell is suitable for grouping data of multiple users without wasting payload.

The above-described role is performed by the base station / control station matching unit 103, which is illustrated in FIG.

Referring to FIG. 3, the base station / control station matching unit 103 converts voice, data, and control signals from the plurality of channel cards 102 into an AAL2 type ATM cell, and transmits the ATM to the control station 110 for transmission. This function converts the signal into a PCM signal suitable for the T1 / E1 link.

The base station / control station matching unit 103 is a cell input unit 220 matching with the channel card 102, a channel management unit 201 transforms and manages various channels inputted from the channel card 102 into an AAL2 type ATM cell. And a memory 202, a cell output unit 230 for converting the input ATM signal into a PCM signal for T1 / E1 link, and a processor unit 210 involved in control and bearer setup of each functional unit. Equipped.

Cells of various channels inputted to the channel manager 201 are converted into AAL2 type ATM cells and outputted. If the input data does not satisfy the output condition as AAL2 type ATM cells, the cells are stored in a memory corresponding to each channel.

Then, it waits until the next input data is entered, and if the ATM cell is no longer inputted, the cell of the corresponding channel is not outputted, and thus the quality of service cannot be guaranteed.

In addition, due to the cells that are not output, the memory area of the corresponding channel becomes unusable, and as the number of these channels increases, it becomes a factor that degrades system performance.

In order to overcome the above disadvantages, a timer may be provided for each channel or the processor 210 may manage the timer. However, when a timer is used for every randomly input channel, the system becomes large, and the processor 210 In the method for managing all timers, the load of the processor unit for various multi-channel processing is heavily applied, thereby reducing the efficiency of the base station / control station matching unit 103 apparatus.

The technical problem of the present invention is to solve the disadvantages of the prior art, by inserting the AAL2 type ATM cell timer device for guaranteeing the quality of service, while increasing the efficiency of line matching while reducing the load on the processor unit, and guarantees the quality of service A timer device, a control method thereof, and a base station / control station matching device having the same are provided.

The base station / control station matching device according to an aspect of the present invention for achieving the technical problem,

A base station / control station matching device for connecting communication by matching a wireless signal received to a channel card through a modem from a plurality of mobile stations with a wired signal of a control station,

A cell input unit matching the channel card;

A channel manager for transforming and managing various channels input from the channel card into an ATM cell of a predetermined type;

A memory for storing data that cannot be converted into a certain type of ATM cell by the channel manager;

A timer that receives the data stored in the memory and counts the data and matches and outputs the data according to whether a threshold value is reached;

A cell output unit for converting the input ATM signal into a pulse width modulated signal to match a T1 / E1 link with the control station;

It includes a processor unit involved in control of each functional unit and bearer setup.

ATM cell timer device according to an aspect of the present invention for achieving the above technical problem,

In the AAL2 type ATM cell timer device for guaranteeing the quality of service,

First-in, first-out storage means for receiving ATM cell information input from the channel manager;

Based on the first storage means, the input ATM cell information is received and mapped to the existing information. If new information is input, the corresponding counter is stored at the same time as the new information is input. Second storage means for operating again after initialization;

Timer counter means operative in association with information stored in said second storage means; First-in, first-out storage means for storing a value output by the second storage means when the counter means reaches a threshold value;

Fourth storage means of first in, first out to prevent loss of new information entered if said second storage means cannot afford due to input information;

And control means for controlling the first to fourth storage means.

ATM cell timer device according to another aspect of the present invention for achieving the above technical problem,

As a timer device to guarantee the quality of service when transmitting AAL2 type ATM cell,

First-in, first-out (FIFO), which serves as a match for external inputs,

Content Addressable Memory (CAM) which stores and maps each information and operates the counter.

Timer counter that outputs a signal when it reaches the threshold after operation connected 1: 1 with the corresponding addressing memory.

Output first-in, first-out memory that functions to match output to externally stored when the threshold value of the counter is reached.

First-in, first-out memory to prevent loss of new information entered when there is no space in the content addressing memory, and

It includes a control unit for controlling each of the memories.

The content addressable memory (CAM) is a storage device that can access its location by the content of the stored data, and it is possible to perform a parallel search, and the search can be performed even with a whole word or a part, and the storage capacity and external factors It means the memory with logic circuit to compare the contents of the corresponding area.

In the present invention, the content addressing memory, the first-in, first-out memory, and the counter may be appropriately used, and may be implemented as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). It is possible to expand the content addressing memory or the first-in, first-out memory without modifying the channel management unit.

 The control method of the ATM cell timer device according to an aspect of the present invention for achieving the technical problem,

When the present invention will be described with reference to the accompanying drawings so that those skilled in the art can be easily carried out as follows.

4 is a block diagram of a base station / control station matching device according to an embodiment of the present invention.

Referring to FIG. 4, the base station / control station matching device includes a cell input unit 313 matching with the channel card 102 and a channel manager for transforming and managing various channels input from the channel card 102 into an AAL2 type ATM cell. 314; A memory 312 for storing data which cannot be converted into a certain type of ATM cell by the channel manager; A timer 310 which receives the data stored in the memory and counts the data and matches and outputs the data according to whether a threshold value is reached; A cell output unit 315 for converting the input ATM signal into a pulse width modulated signal to match the T1 / E1 link with the control station; It includes a processor unit 316 involved in control of each functional unit and bearer setup.

Referring to the operation of the base station / control station matching device having such a configuration is as follows.

The cells of the various channels inputted to the channel manager 314 are converted into AAL2 type ATM cells and outputted. If the input data does not satisfy the output condition as the AAL2 type ATM cells, they are stored in the memory 312 corresponding to each channel. do.

Then, the timer 310 receives the data stored in the memory 312 and counts the data, and matches and outputs the data according to whether the threshold is reached.

On the other hand, the cell output unit 315 converts the input ATM signal into a pulse width modulated signal to match the T1 / E1 link with the control station, and the processor unit 316 is involved in the control and bearer setup of each functional unit. .

In this process, the operation of the timer 310 will be described in detail as follows.

5 is a block diagram of an AAL2 type ATM cell timer device 310 according to the present invention.

Referring to Figure 5, AAL2 type ATM cell timer device according to the present invention,

An input first-in first-out memory 300 that inputs information of data stored in the memory 312 without being output to an AAL2 type ATM cell, and a timer content addressing to allow the input information to be stored or countered depending on whether there is existing information. Memory (CAM) 301, a timer counter 302 that operates according to the timer content addressing memory setting, an output first-in first-out memory 303 that performs an output matching function, and the contents addressing memory in consideration of A feedback first-in first-out memory 304 for preventing the loss of input information and a control unit 305 for controlling each memory and information are included.

By using the first-in, first-out memory for input and output matching, the matching becomes simple and stable operation is possible even if the external input information speed and the internal processing speed using the information are different.

The input first-in first-out memory 300 stores the input ATM information, and the information is output when the internal processing is possible.

When the timer content addressing memory 301 compares the input information with previously stored information and initializes the counter, it operates the counter again. If the corresponding information is not stored, the timer content addressing memory 301 is inputted in an arbitrary position. Save the information and run the counter. When the counter reaches a threshold and gives a signal, the counter outputs the information stored by the signal to the controller 305.

The timer counter 302 is connected to the area of the timer content addressing memory 301 and the counter is operated by an information input signal, and when the settable threshold value is reached, the timer counter 302 signals the corresponding timer content addressing memory 301. Output and stop. When the initialization signal is input during the operation of the timer count 302, the initialization is initiated, and the count 302 advances to the threshold value again.

The feedback first-in, first-out memory 304 may be stored in the timer content addressing memory 301 to prevent the loss of input information when the capacity of the timer content addressing memory 301 cannot be stored any more. It saves the inputted information until the area comes out.

The output first-in first-out memory 303 notifies the outside that there is information to be output, and outputs the information by an external operation.

The controller 305 controls the memories. If there is information in the input first-in first-out memory 300 and there is no information in the feedback first-in, first-out memory 304 serves to output the information of the input first-in first-out memory 300 to the timer content addressing memory 301 as input. If there is no area to be stored in the timer content addressing memory 301, the input information is stored in the feedback first-in, first-out memory 304. When there is information in both the input first-in first-out memory 300 and the feedback first-in first-out memory 304, the information is alternately output.

At this time, if there is no area to be stored in the timer content addressing memory 301, the inputted information is stored in the feedback first-in first-out memory 304. After the threshold is reached, information output from the timer content addressing memory 301 serves to input the output first-in first-out memory 303.

When the AAL2 timer can no longer receive the input information, it has a function to give an interrupt signal to the channel manager or processor.

Next, the operation of the ATM cell timer device according to the embodiment of the present invention having such a configuration will be described.

6 is a detailed flowchart illustrating the information processing of the AAL2 type ATM cell timer device 300 according to the present invention.

Referring to FIG. 6, the AAL2 timer controller 305 receives the information from the input first-in-first-out memory 300 and inputs the information into the timer content addressing memory when there is information processing and whether there is a timer content addressing memory area (S400). ).

In this case, the information may be the address of the external memory in which the AAL2 cell is stored, the data length stored in the external memory, the VPI / VCI / CID, and the like, and may be adjusted by the user (S401).

Then, when the input information is in the timer content addressing memory, the counter is initialized (S404) and the counter is operated (S405). If the input information is not in the timer content addressing memory (S402) The information is stored at an arbitrary position (S403), and the counter is operated (S405).

If the threshold value of the counter is not input to the corresponding addressing memory (S406), the counter continues to operate. If the threshold value is reached, a signal is sent to the addressing memory to output the stored information (S408).

Such embodiments of the present invention may be variously modified, and the components may be configured in software or hardware.

As described above, in the embodiment of the present invention, the AAL2 timer 300 device is placed in the base station / control station matching unit 103, and the system is enormous by placing a counter on all channels for any channel, or the timer in the processor. Adds functionality to overcome the disadvantages of overloading the processor and degrading the performance of line matching, guarantees the service quality of AAL2 type ATM cells, and can be easily applied anywhere using other AAL2 type ATM cells, resulting in a flexible system. It can work.

1 is a simple configuration example for explaining a general wireless communication system.

2 is an explanatory diagram showing a general AAL2 type ATM cell structure.

3 is a detailed configuration diagram of an embodiment of a base station / control station matching unit 103 of a general wireless communication system base station.

4 is a detailed configuration diagram of a matching device between a base station and a control station according to an embodiment of the present invention.

5 is a block diagram of an AAL2 type ATM cell timer device for QoS guarantee according to an embodiment of the present invention.

6 is an operation flowchart of an AAL2 type ATM cell timer device 300 for QoS guarantees according to the present invention.

* Brief description of the main parts of the drawing *

310: timer 301: timer contents addressing memory

302: timer counter 300: input first-in first-out memory

305: control unit 303: output first-in first-out memory

304: first-in, first-out memory

Claims (13)

In the AAL2 type ATM cell timer device for guaranteeing the quality of service, First storage means for receiving ATM cell information input from an external channel manager; Timer counter means having a plurality of counters for counting; Receives ATM cell information input from the first storage means and maps it to existing information, and if the information is new, stores the input information and operates the counter corresponding to the storage space, and if the existing information is present, corresponds to the existing information. Second storage means for performing a counting operation again after initializing only the counter; Third storage means for receiving and storing ATM cell information stored in the second storage means when the timer counter means has reached a threshold; Fourth storage means for storing the inputted new information when the second storage means has no space to store the input information; Control means for controlling the first to fourth storage means, The first storage means, A timer device comprising a first-in first-out memory, and storing input information and outputting the received information by an external request signal. delete The method of claim 1, The second storage means compares the input information with the previously stored information, initializes the counter and restarts the counter when the match is made. If the information is not stored, the second storage means stores the input information at an arbitrary position. And operate the counter to output information stored by the signal to the controller when the counter reaches a threshold. The method of claim 1, And the third storage means comprises a first-in first-out memory, which stores information to be output and outputs the information by an external request signal. The method of claim 1, The fourth storage means is configured as a first-in, first-out memory, and can no longer be stored when the capacity of the second storage means is exceeded. The fourth storage means may be stored in the second storage means to prevent the loss of input information. A timer device, characterized in that the function of storing the input information until the area comes out. The method of claim 1, The timer counter is connected to the second storage means, and the counter is operated by a signal of the second storage means and outputs a signal to the second storage means and stops the operation when the set threshold is reached. The timer device, characterized in that the initialization is received when the initialization signal is received during the timer count operation, the count proceeds to the threshold again. The method of claim 1, The controller may further receive input information due to a function of controlling the first, second, third, and fourth storage means and a capacity limitation of the first, second, third, and fourth storage means. Timer device characterized in that to give an interrupt signal to the outside if there is no. The method of claim 1, The information input to the second storage means includes memory address information in which AAL2 packets are stored, AAL2 header information, and AAL2 packet length information. As a timer device to guarantee the quality of service when transmitting AAL2 type ATM cell, First-in, first-out (FIFO), which serves as a match for external input, A timer counter that includes a plurality of counters that count according to external control and output a signal when a threshold is reached, A content addressable memory (CAM) corresponding to the counters in a 1: 1 manner, storing each input information and mapping the counters to operate the counters; An output first-in, first-out memory that is stored in the content addressing memory corresponding to the counter, stores information and outputs it to the outside, and functions to match with the outside when the counter reaches a threshold value; A feedback first-in first-out memory that stores new information input from the input first-in first-out memory when the contents addressable memory is not free; And a controller for controlling the memories. A base station / control station matching device for connecting communication by matching a wireless signal received to a channel card through a modem from a plurality of mobile stations with a wired signal of a control station, A cell input unit matching the channel card; A channel manager for transforming and managing various channels input from the channel card into an ATM cell of a predetermined type; A memory for storing data that cannot be converted into a certain type of ATM cell by the channel manager; A timer that receives the data stored in the memory and counts the data and matches and outputs the data according to whether a threshold value is reached; A cell output unit for converting the input ATM signal into a pulse width modulated signal to match a T1 / E1 link with the control station; A base station / control station matching device comprising a processor unit involved in control of each functional unit and bearer setup. A control method of an AAL2 type ATM cell timer device for guaranteeing service quality, A first step of accepting information from the input first-in first-out memory when it is determined that the controller can process the information and there is an area to be stored in the timer content addressing memory; A second step of comparing whether the input information is in the timer content addressing memory; A third step of initializing a counter when the inputted information is in the timer content addressing memory as a result of the comparison of the second step; A fourth step of initializing the counter in the third step and then operating the counter again; A fifth step of checking whether the counter has reached a threshold in the fourth step; And a sixth step of outputting corresponding information stored in the timer content addressing memory when the threshold value of the counter reaches the comparison result of the fifth step. The method of claim 11, And a seventh step of storing the input information when the input information is not present in the timer content addressing memory as a result of the comparison of the second step. The method of claim 12, And if the threshold value of the counter has not been reached as a result of the comparison in the fifth step, checking whether there is information input into the timer content addressing memory.