JPH03276941A - Packet communication terminal equipment - Google Patents

Abstract

PURPOSE:To improve the effect of flow control at congestion independently of the quantity of information production and to keep prescribed communication quality by setting a threshold level for layer configuration in response to the result of measurement of quantity of information generated from the equipment for a prescribed time. CONSTITUTION:A threshold level setting section 18 sets a threshold level for layer configuration by a layer processing section 13 in response to the result of measurement of produced information quantity for a prescribed time by a packet communication terminal equipment 1 from a traffic measuring section 17. When the produced information quantity is increased, a ratio of production of packets with high priority level is reduced to sufficiently enhance the effect of flow control at congestion and when the produced information quantity is decreased conversely, a ratio of production of packets with high priority level is increased to prevent deterioration in the communication quality at packet abort on the occurrence of congestion. Thus, the effect of flow control at congestion is improved independently of the quantity of information production and prescribed communication quality is maintained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention allows buckets with multiple priority levels, and during congestion, only the bucket with a higher priority level is transmitted, and the buckets with a lower priority level are not transmitted. The present invention relates to a bucket communication terminal device accommodated in a bucket communication network that performs flow control by discarding.

[Conventional technology]

FIG. 6 is a block diagram showing a conventional bucket communication terminal device disclosed in, for example, Japanese Unexamined Patent Publication No. 63-76645. In the figure, 1 is a bucket communication terminal device, and 2 is a bucket communication terminal device in which this communication terminal device 1 is accommodated.Buckets with multiple priority levels are allowed, and during congestion, only the bucket with a high priority level is transmitted, and the priority level is It is a bucket communication network that performs flow control by discarding low buckets.

Further, in the bucket communication terminal device 1, 11 is an image information input unit into which image information is inputted from the outside, and 12 is an image information input unit that encodes the image information inputted into the image information unit 11 and encodes the image information into a bandwidth. This is an encoding unit that performs compression. 13 hierarchically encodes and band-compresses the encoded data in the encoder I2 based on a predetermined threshold, and divides it into data with a high priority level (hereinafter referred to as MSP data) and data with a low priority level (hereinafter referred to as MSP data). This is a layering unit that separates the data into LSP data (called LSP data).

14 and 15 are bucket assembly units that assemble data for each priority level hierarchized by the hierarchization unit 13 into buckets corresponding to the priority level; 14 is a high priority bucket assembly unit that assembles MSP data into buckets of high priority level; Section 15 is a low priority pass and get assembly section that assembles LSP data into buckets of low priority level. A bucket multiplexer 16 multiplexes the buckets of each priority level assembled by the high-priority bucket assembler 14 and the low-priority bucket assembler 15, and sends the multiplexed buckets to the bucket communication network 2.

Next, the operation will be explained. The image information input section 11 of the bucket communication terminal device 1 takes in image information as input information from the outside and sends it to the encoding section 12 . The encoding unit 12 encodes the received image information, performs band compression, and sends the resulting encoded data to the layering unit 13. The hierarchization unit 13 hierarchizes the encoded data sent to it based on a preset threshold, and separates it into MSP data that has a large impact on image quality and LSP data that has a small impact on image quality. The MSP data is sent to the high priority bucket assembly section 14 and the LSP data is sent to the low priority bucket assembly section 15.

The high-priority bucket assembling unit 14 adds a header to the MSP data separated by the hierarchization unit 13 and assembles the MSP data into high-priority level buckets. Similarly, the low priority bucket assembling section 15 adds a header to the LSP data from the hierarchization section 13 and assembles it into fixed length buckets of low priority level. The buckets assembled in the high-priority bucket assembly section 14 and the low-priority bucket assembly section 15 in this manner are sent to the bucket multiplexing section 16 where they are multiplexed and sent out to the bucket communication network 2.

FIG. 5 shows the processing procedure at the time of bucket transfer in this bucket communication network 2. First, in step STI, it is determined whether or not the network is in a congested state. If the network is in a congested state, the process advances to step ST2, and if not, the process advances to step ST3. In step ST2, the priority level of the bucket to be transferred is determined, and if it is a high priority level bucket, the process proceeds to step ST3, and if it is a low priority level bucket, the process proceeds to step ST4. In step ST3, transfer processing for the bucket is executed, and in step ST4, discard processing for the bucket is executed. In this way, during congestion, flow control is performed to reduce the amount of traffic by discarding buckets with low priority levels and transferring only buckets with high priority levels.

[Problem to be solved by the invention]

Since the conventional bucket communication terminal device is configured as described above, the generation ratio of buckets with high priority level and buckets with low priority level is constant regardless of the amount of information generated.
If the ratio of buckets with a high priority level is set high, as the amount of information generated increases, there will be fewer buckets that can be discarded at the time of congestion, so the effect of flow control will be reduced. If set low, when the amount of information generated is small, the percentage of buckets that are lost due to flow control during congestion will be large compared to the amount of information that reaches the other party's terminal, leading to problems such as a significant deterioration of communication quality. there were.

This invention was made in order to solve the above-mentioned problems, and it is possible to obtain sufficient flow control effects during congestion and maintain a constant communication quality regardless of the amount of information generated. The purpose of the present invention is to obtain a bucket communication terminal device that can perform the following functions.

[Means to solve the problem]

The bucket communication terminal device according to the present invention includes a traffic measuring section that measures the amount of information sent from the bucket communication terminal device to the bucket communication network in a certain period of time, and a traffic measuring section that measures the amount of information sent from the bucket communication terminal device to the bucket communication network in a certain period of time, and a traffic measuring section that measures the amount of information sent from the bucket communication terminal device to the bucket communication network in a certain period of time. A threshold value setting unit is provided for setting a threshold value used for the hierarchization in the hierarchization unit that performs hierarchization based on the measurement results of the traffic measurement unit.

[Effect]

The threshold setting unit in the present invention obtains the measurement result of the amount of information generated by the bucket communication terminal device in a certain period of time from the traffic measurement unit, and sets the threshold for hierarchization in the hierarchization unit according to the measurement result. By doing this, it is possible to change the generation ratio of high-priority buckets and low-priority buckets according to the amount of information generated, and the flow control effect during congestion is fully demonstrated regardless of the amount of information generated. A bucket communication terminal device capable of ensuring communication quality is realized.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a bucket communication terminal device, 2 is a bucket communication network, 11 is an image information human power section, 12 is an encoding section, and 13 is a bucket communication terminal device.
14 is a high-priority bucket assembly unit, 15 is a low-priority bucket assembly unit, 16 is a bucket multiplexing unit, and the sixth
Since these parts are the same as or equivalent to those in the prior art, which are denoted by the same reference numerals in the figures, detailed explanations will be omitted.

Further, 17 is a traffic measurement unit that measures the number of buckets sent from the bucket multiplexing unit 16 to the bucket communication network 2 in a certain period of time, and calculates the amount of information generated by the bucket communication terminal device 1. 18, based on the measurement results of the traffic measuring section 17, the layering section 13
This is a threshold value setting unit that sets a threshold value to be used when hierarchizing the encoded data from 2 to MSP data and LSP data in accordance with the priority level.

Next, the operation will be explained. The traffic measurement unit I7 receives data from the bucket communication network 2 from the bucket multiplexing unit 16 within a certain period of time.
The number of buckets sent to is measured, and the amount of information generated by the bucket communication terminal device 1 is calculated based on the bucket length and the measured number of buckets. The information generation amount calculated in this way is determined by the traffic measuring section 17 and the threshold setting section 1.
8 will be notified.

The threshold setting unit 18 that has received the notification refers to a built-in information generation amount/threshold correspondence table created in advance based on the received information generation amount, and determines a predetermined threshold value for MSP data determination. . FIG. 2 is an explanatory diagram showing an example of the information generation amount/threshold value correspondence table. As shown in the figure, as the amount of information generation increases from less than A to more than A and less than B, ..., more than D, the threshold for determining MSP data also increases.
F.

Change to G, H, and I in sequence. In this case, the magnitude relationship of the threshold values is E<F<...I.

The threshold value setting unit 18 sends the thus obtained threshold value for MSP data determination to the hierarchization unit 13 and sets it. The hierarchization unit 13 separates the encoded data sent from the encoding unit 12 into MSP data and LSP data based on the set threshold value, and sends the encoded data to the high-priority bucket assembly unit 14 or the low-priority bucket assembly unit 15. Send to. Here, FIG. 3 is an explanatory diagram showing the relationship between the threshold value in this hierarchization unit 13 and the generation ratio of MSP data. That is, the hierarchization unit 13 performs control so that the generation ratio of MSP data is inversely proportional to the set threshold value, and as the amount of information generation increases, the threshold value increases, reducing the MSP data generation ratio, and vice versa. As the amount decreases, the threshold value becomes smaller, increasing the MSP data generation rate.

Hereinafter, in the same way as in the conventional case, the bucket communication terminal device 1
The buckets are multiplexed and sent out, and the sent out buckets are transferred within the bucket communication network 2 according to the procedure shown in FIG.

Note that although the above embodiments have been shown as having one system of image information input section and encoding section, it is also possible to have a plurality of systems thereof. FIG. 4 is a block diagram showing an embodiment including four systems. In the figure, lla to lld are four image information input units, and 12
A to 12d are four encoding units provided corresponding to the image information input units 11a to lid, respectively. For other parts, corresponding parts are given the same reference numerals as in the case of FIG. 1, and explanations thereof will be omitted.

In the bucket communication terminal device 1 configured in this way, the priority level of the image information manually inputted to the image information input section 11a and llb is higher than that of the image information inputted to the image information input section 11c and lid. In this case, when the amount of information generation increases, the layering unit 13 maintains the MSP data generation ratio of the encoded data from the encoding units 12a and 12b as it is, and It is also possible to configure the system so that only the MSP data generation ratio of converted data is changed.

In addition, the layering unit 13 measures the amount of information generated by each of the encoding units 12a to 12d, and measures the amount of information generated by each of the encoding units 12a to 12d.
For the encoded data from 12d, the MSP data generation ratio is changed to be smaller, and for the encoders 12a to 12d, which generate less information, the MSP data generation ratio is changed to be larger. In this way, the generation ratio of MSP data output from the hierarchization section 13 may be controlled so as to have a value corresponding to the threshold set by the threshold setting section 18 as a whole.

Furthermore, in the above embodiment, the case where the human input information is image information has been described, but an audio information input unit is provided in place of the image information input unit, and the audio information input manually from this audio information input unit is encoded and hierarchically processed. It is also possible to assemble buckets with different priority levels, and the same effect as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, the threshold for hierarchization is set in the hierarchization unit according to the measurement result of the amount of information generated in a certain period of time by the bucket communication terminal device. The generation ratio of high-priority buckets and low-priority buckets can be changed according to the amount of information, and when the amount of information generated increases, the generation ratio of high-priority buckets decreases, reducing the flow during congestion. When the control effect is fully demonstrated and the amount of information generated decreases, the generation ratio of high-priority buckets increases, and bucket communication prevents deterioration of communication quality due to bucket discards during width reduction. There is an effect that the terminal device can obtain.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a bucket communication terminal device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of the information generation amount/threshold value correspondence table, and FIG. 3 is a block diagram showing an example of the information generation amount/threshold value correspondence table. FIG. 4 is a block diagram showing another embodiment of the present invention, FIG. 5 is a flowchart showing the procedure of bucket transfer processing in a bucket communication network, and FIG. 6 is a conventional diagram showing the relationship with the data generation ratio. FIG. 2 is a block diagram showing a bucket communication terminal device of FIG. 1 is a bucket communication terminal device, 2 is a bucket communication network, 12
．． 12a = 12d is an encoding unit, 13 is a layering unit, 14
15 is a bucket assembly section (high priority bucket assembly section), 15 is a bucket assembly section (low priority 5 x 8 brush assembly section), 16 is a bucket multiplexing section, 17 is a traffic measurement section, and 18 is a threshold setting section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] It is accommodated in a bucket communication network that allows buckets with multiple priority levels and performs flow control by transmitting only the buckets with the higher priority level and discarding the buckets with the lower priority level in the event of congestion. an encoding unit that performs the encoding, a hierarchization unit that separates the encoded data encoded by the encoding unit into correspondence to the priority level based on a predetermined threshold; a bucket assembly unit that assembles data for each priority level into buckets of the priority level; and bucket multiplexing that multiplexes the buckets of each priority level assembled by the bucket assembly unit of each priority level and sends the same to the bucket communication network. a traffic measurement unit that measures the amount of information sent from the bucket communication terminal device to the bucket communication network in a certain period of time; A bucket communication terminal device comprising: a threshold value setting section that sets the threshold value in the hierarchization section.