JPH1013473A - Buffer area managing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer area managing method for reducing the generation rate of an exception processing 'Tx- Buffer- Full' error in a digital mobile telephone system base station controller and for improving reliability in data communication. SOLUTION: A part of a reception buffer area is used as a transmission buffer area in a transmission/reception buffer 6 for reducing the generation rate of the exception processing 'Tx- Buffer- Full' error generated at the data communication in the digital mobile telephone system base station controller 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffer area management method for transmission and reception in a digital mobile telephone system base station controller.

[0002]

2. Description of the Related Art FIG. 1 is a block diagram showing an example of the configuration of a conventional digital mobile telephone system base station controller 21 to which the present invention is applied. Data communication with the outside in the digital mobile telephone system base station control device 21 shown in FIG. 1 is performed between the CP card 5 and the external device 8 via the DU card 7 (data relay card). It is the role of the DU card 7 to perform direct data communication with the external device 8, and the CP card 5 exchanges data with the DU card 7. The memory of the DU card 7 is provided with a transmission buffer / reception buffer 6 (both having a fixed buffer area size). When data communication is performed between the CP card 5 and the DU card 7, both buffers (transmission / reception buffers) are provided. 6 and the data is transferred.

[0003]

In the digital mobile telephone system base station controller 21 shown in FIG. 1 having the above-described configuration, an exceptional "Tx_Buffer_Full" error occurs when an enormous amount of data is transmitted during data communication. There was a problem that occurred and transmission processing became impossible. The reason is that the transmission processing is not enough for the data set to the transmission buffer 6 because the transmission data is huge, and the transmission buffer 6
This is because the state becomes the L state.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a buffer area management method capable of reducing the rate of occurrence of an exception process "Tx_Buffer_Full" error in a digital mobile telephone system base station controller and improving reliability in data communication.

[0005]

According to the buffer area management method of the present invention, an exception process "Tx_Buffer" which occurs during data communication in a base station controller of a digital mobile telephone system.
In order to reduce the occurrence rate of the "_Full" error, a part of the reception buffer area is used as a transmission buffer area.

In the present invention, a preferred example of using a part of the reception buffer area as a transmission buffer area is as follows. First, when the transmission buffer which is the cause of the exception processing “Tx_Buffer_Full” error is in the FULL state,
The presence or absence of an empty reception buffer is determined. If there is no empty buffer in the reception buffer, exception processing "Tx_
Buffer_Full "error. However, if there is an empty buffer in the reception buffer, the area of the reception buffer is temporarily used as a transmission buffer (variable buffer).
That is, the transmission buffer area size and the reception buffer area size are changed according to the situation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIG. 1, the flow of a data communication process of a digital mobile telephone system base station controller to which the present invention is applied will be described. First, the flow of transmission data is as follows. The CP card 5 stores the transmission data in the transmission buffer 6 (transmission processing 1 in CP). When the DU card 7 confirms that data is accumulated in the transmission buffer 6, the DU card 7 takes out the transmission data from the transmission buffer 6 (D
U) Transmission processing 2), transmitting the received transmission data to the external device 8. Next, the flow of received data is as follows. When receiving the data from the external device 8, the DU card 7 stores the received data in the reception buffer 6 (DU).
3). When the CP card 5 confirms that data is accumulated in the reception buffer 6, the CP card 5 receives the received data (reception processing 4 in the CP).

FIG. 2 is a diagram showing an example of the configuration of the transmission / reception buffer 6 in detail. In the example shown in FIG. 2, the transmission / reception buffer 6 includes a transmission buffer 9 and a reception buffer 10. The transmission buffer 9 has 32 buffers, and has a data presence / absence bit 11, a buffer identification area 12, and a buffer # area 13 at the head of each buffer. The reception buffer 10 has 16 buffers. At the head of each buffer, a data presence / absence bit 11 and a buffer identification area 1
Have two.

The data presence / absence bit 11 is a flag for determining the presence / absence of a signal in the corresponding buffer. The flag of the data presence / absence bit 11 is “ON”, indicating that data is present, and the flag of the data presence / absence bit 11 is “OFF”, indicating that there is no data. The buffer identification area 12 is an area for determining in what state the buffer is being used. What is set in the transmission buffer 9 is normally “0”. "1" when the transmission buffer 9 becomes FULL and the buffer next to the buffer is a variable buffer
Is set. What is set in the reception buffer 10 is normally “0”. “2” is set in the buffer used as the variable buffer. “3” is set in the last buffer used as a variable buffer. The buffer # area 13 is owned only by the transmission buffer 9, and
When the transmission buffer 9 becomes FULL and the reception buffer 10 is used as a variable buffer, this is an area for storing a head buffer # of the reception buffer 10 used as a variable buffer. According to the present invention, a part of the reception buffer 10 is changed to the transmission buffer 9 (variable buffer) based on the above configuration.
It is possible to use as.

Next, the operation when the receiving buffer 10 is used as a variable buffer in the present invention will be described with reference to CP.
The transmission process in the card 5 and the transmission process in the DU card 7 will be described separately. In the following description,
The transmission AIP 14 (transmission auto increment pointer) indicates the last transmission buffer # in which transmission data is set by the CP card 5. The reception AIP 15 (reception auto-increment pointer) indicates the last variable buffer # in which transmission data is set by the CP card 5. Variable AIP16 (variable auto increment
Pointer) indicates the last variable buffer # in which transmission data is set by the CP card 5.

The variable area use flag is a flag owned by the CP card 5 and turned on while the variable buffer is being used. The variable buffer number flag indicates a flag owned by the CP card 5 and counted when the variable buffer is used. Transmission P (transmission pointer)
Indicates a final transmission buffer # for which the DU card 7 has completed the data transmission process, with a flag owned by the DU card 7. P
The save area (send pointer save area) indicates an area for temporarily saving the transmission P value when using the variable buffer with the flag owned by the DU card 7.

(1) Regarding the transmission process in the CP card 5 (refer to the flowchart shown in FIG. 3): Step S1: When the transmission process is started in the CP card 5, the transmission AIP 14 first obtains the next transmission buffer #. The presence / absence of data is determined from the obtained data presence / absence bit 11 of the transmission buffer. Here, when there is data, the transmission buffer 9 determines that the transmission buffer 9 is FULL.

Step S2: If the transmission buffer 9 is determined to be FULL in step S1, it is confirmed from the reception AIP 15 that there is an empty buffer in the reception buffer 10, and this is set as a transmission buffer (variable buffer). At this time,
The number of variable buffers is limited to five buffers.

Step S3: If it is determined in step S2 that the reception buffer 10 has an empty buffer, the reception AI
The value of P15 is set in the variable AIP16. Thereafter, the variable buffer # is obtained using the variable AIP 16. In order to use the reception buffer 10 as a variable buffer for five buffers, the reception AIP 16 is updated for five buffers.
As a result, the processing on the receiving side can be executed as it is. Next, in the buffer # area 13 of the transmission buffer 9,
The buffer # at the head of the reception buffer used as the variable buffer is stored. On the DU card 7 side, it is possible to know which reception buffer is being used as a variable buffer from this area. Next, "variable start" is set in the buffer identification area 12 of the transmission buffer 9, "variable" is set in the buffer identification area 12 of the reception buffer 10 used as a variable buffer, and "variable" is set in the buffer identification area 12 of the final reception buffer 10. Sets "variable end". On the DU card 7 side, processing differs depending on the value of this area.

Step S4: Unlike steps S1 to S3, when it is determined that the reception buffer is used as a transmission buffer (variable buffer) at the stage when the transmission processing is started in the CP card 5, the corresponding variable buffer is used. And sets the data presence bit 11 to “ON”. Thereafter, the transmission processing is repeated, and when all the variable buffers are used, a transmission buffer is obtained from the transmission AIP 14 and the presence or absence of transmission data is determined from the data presence / absence bit 11. If there is no transmission data, normal transmission processing is performed, and if there is transmission data, exception processing "T
x_Buffer_Full "error occurs.

(2) Regarding the transmission processing in the DU card 7 (see the flowchart shown in FIG. 4): Step 5: When the transmission processing is started in the DU card 7, first, the transmission buffer # or variable buffer # next to the transmission P
Ask for. Data transmission presence / absence bit 11 obtained
More data is determined. Step 6: If there is data, start transmission processing to the external device 8. The data presence / absence bit 11 is set to “OFF” when this transmission processing is completed.

Step 7: The buffer identification of the corresponding buffer is determined from the buffer identification area 12 in the transmission buffer or the variable buffer. If the buffer identification is “normal”, it is determined that the transmission processing is normally performed on the CP card 5 side, and the transmission processing is also normally performed on the DU card 7 side. Step 8: If the buffer identification is "variable start", the transmission buffer 9 becomes FULL, and it is determined that the CP card 5 uses the variable buffer. The transmission P at this time is saved in the P save area, the transmission P is calculated from the reception buffer # in the buffer # area 13 in the transmission buffer, and the value is set to the transmission P. Step 9: If the buffer identification is "variable end", it is determined that the use of the variable buffer has ended, the value of the P save area is set to transmission P, and normal processing is performed.

[0018]

As is clear from the above description, according to the buffer area management method of the present invention, by making the buffer area size variable, it is possible to reduce the occurrence rate of exception processing "Tx_Buffer_Full" errors. Thus, there is an effect that the transmission / reception buffer area can be used efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a configuration of a digital mobile telephone system base station controller.

FIG. 2 is a diagram illustrating an example of the configuration of a transmission / reception buffer in detail.

FIG. 3 is a flowchart illustrating an example of a CP card transmission process.

FIG. 4 is a flowchart illustrating an example of a DU card transmission process.

[Explanation of symbols]

 1 Transmission processing by CP card 2 Transmission processing by DU card 3 Reception processing by DU card 4 Reception processing by CP card 5 CP card 6 Transmission / reception buffer 7 DU card 8 External device 9 Transmission buffer 10 Reception buffer 11 Data presence / absence bit 12 buffer identification area 13 buffer # area 14 transmission AIP 15 reception AIP 16 variable AIP 21 digital mobile telephone system base station controller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04Q 7/30

Claims (2)

[Claims] 1. An exception process "Tx_Buff" which occurs during data communication in a digital mobile telephone system base station controller.
A buffer area management method characterized by using a part of a reception buffer area as a transmission buffer area in order to reduce the occurrence rate of "er_Full" errors. 2. A method of using a part of the reception buffer area as a transmission buffer area by using exception processing “Tx_Buffer_Ful
l If the transmission buffer causing the error is in the FULL state, it is determined whether there is an empty reception buffer.
If there is no empty buffer in the reception buffer, exception processing "Tx_
2. The buffer area management method according to claim 1, wherein a buffer_full error is generated, and when an empty buffer is present in the reception buffer, the empty buffer area is temporarily used as a transmission buffer.