JP5947273B2 - Transmitter, data processing method and data transmission / reception system - Google Patents

Description

  The present invention relates to a transmitter for transmitting data, a data processing method, and a data transmission / reception system.

The portable terminal has a function of connecting to the Internet and acquiring various media data such as text data, still image data, music data, and moving image data and playing it back.
By the way, there may be a case where playback is not comfortable due to deterioration of the radio wave reception environment due to an environment where the radio wave intensity is poor or congestion occurs on the network.

  In Patent Document 1, in an ultra-high-speed wireless communication system that transmits video and image data, the compression rate of video and image data is variable between non-compression and low compression according to the radio wave propagation environment, and accompanying this A technique has been proposed in which communication is performed within a range in which a propagation path difference due to multipath does not cause an error by changing a wireless transmission rate.

JP 2007-194706 A

  The present invention provides a transmitter, a data processing method, and a data transmission / reception system capable of compressing or reducing media data at an appropriate compression rate or reduction rate by monitoring traffic transfer or transmission status. The purpose is to do.

  In order to solve the above problems, a transmitter according to the present invention transmits a media data compressed or reduced based on a predetermined format, and media data compressed or reduced by the processor to a user terminal device. A transmission unit that receives data transmitted from the user terminal device, and a monitoring unit that monitors traffic transfer or transmission status based on the operations of the transmission unit and the reception unit. The processing unit determines whether or not to compress or reduce the media data based on the traffic transfer or transmission status monitored by the monitoring unit, and if it determines to compress or reduce the compression rate or reduction The rate is determined, and the media data is compressed or reduced according to the determined compression rate or reduction rate.

  In the transmitter, when the processing unit determines whether to compress or reduce the media data based on the traffic transfer or transmission status monitored by the monitoring unit, and determines not to perform compression or reduction Alternatively, the media data may not be compressed or reduced, and the transmission unit may transmit media data that has not been compressed or reduced to the user terminal device.

  The transmitter includes a storage unit that stores information on the user terminal device, and the processing unit is configured to transfer or transmit the traffic monitored by the monitoring unit, and the user terminal device stored in the storage unit. Whether or not to compress or reduce the media data based on the above information. If it is determined to compress or reduce the media data, the compression rate or reduction rate is determined, and the media data is determined according to the determined compression rate or reduction rate. The structure which compresses or reduces may be sufficient.

  In the transmitter, when the media data is moving image data or audio data, the monitoring unit calculates a throughput based on a transmission amount of the media data transmitted by the transmission unit, and the transmission unit performs media RTT (Round Trip Time) is calculated based on the timing of transmitting data and the timing of receiving data transmitted from the user terminal device by the receiving unit, and the processing unit calculates the throughput and the RTT. Based on this, it is determined whether to compress or reduce the media data. If it is determined to compress or reduce, the compression rate or the reduction rate is determined, and the media data is compressed or reduced according to the determined compression rate or the reduction rate. It may be configured.

  In the transmitter, when the media data is text data or still image data, the monitoring unit transmits the timing at which the transmission unit transmits the media data and the data transmitted from the user terminal device by the reception unit. RTT (Round Trip Time) is calculated based on the timing at which the data is received, and the processing unit determines whether to compress or reduce the media data based on the RTT, and determines to compress or reduce the media data Alternatively, the compression rate or reduction rate may be determined, and the media data may be compressed or reduced according to the determined compression rate or reduction rate.

  In the transmitter, the processing unit decodes the media data transmitted from the Web server in response to the request from the user terminal device, and based on the traffic transfer or transmission status monitored by the monitoring unit, It is determined whether or not the decoded media data is to be compressed or reduced. When it is determined that the decoded media data is to be compressed or reduced, a compression rate or a reduction rate is determined, and the decoded media data is compressed or reduced according to the determined compression rate or reduction rate. It may be possible to reduce the configuration.

  In order to solve the above problems, a data processing method according to the present invention includes a processing step of compressing or reducing media data based on a predetermined format, and media data compressed or reduced by the processing step to a user terminal device. A transmitting step for transmitting; a receiving step for receiving data transmitted from the user terminal device; and a monitoring step for monitoring traffic forwarding or transmission status based on the operations of the transmitting step and the receiving step. The processing step determines whether or not to compress or reduce media data based on the traffic transfer or transmission status monitored by the monitoring step. In this configuration, a reduction rate is determined, and media data is compressed or reduced according to the determined compression rate or reduction rate.

  In order to solve the above problems, a data transmission / reception system according to the present invention is a data transmission / reception system including a transmitter and a user terminal device. The transmitter compresses or reduces media data based on a predetermined format. A processing unit that transmits the media data compressed or reduced by the processing unit to the user terminal device, a receiving unit that receives data transmitted from the user terminal device, the transmission unit, and the A monitoring unit that monitors traffic transfer or transmission status based on the operation of the reception unit, and the processing unit compresses the media data based on the traffic transfer or transmission status monitored by the monitoring unit. Or, determine whether or not to reduce, and if compression or reduction is determined, determine the compression rate or reduction rate, and determine the compression rate It is configured to compress or reduce the media data by the reduction rate.

  According to the present invention, media data can be compressed or reduced at an appropriate compression rate or reduction rate.

It is a block diagram which shows the structure of a relay apparatus. It is a figure where it uses for description which acquires the throughput and RTT of moving image data regularly. It is a figure with which it uses for description about each reproduction | regeneration stop frequency in the case of reproducing | regenerating the data which have not been compressed or reduced, and the data which were compressed or reduced. It is a figure which shows typically the table referred when compressing or reducing moving image data based on a throughput and RTT. It is a figure which shows typically the table referred when compressing or reducing text data or still image data based on RTT. It is a figure which shows typically the record produced for every user terminal device.

  The transmitter according to the present embodiment is a concept including all transmission sides that transmit data to a user terminal device, and is, for example, a base station, a relay device, or the like. Below, the structure and operation | movement of the relay apparatus which is an example of a transmitter are demonstrated.

  As shown in FIG. 1, the relay device 1 includes a processing unit 11, a transmission unit 12, a reception unit 13, and a monitoring unit 14, and a wireless communication network (for example, LTE or the like) compliant with a predetermined standard. It is connected to the user terminal device 100 and connected to various Web servers 200 via the Internet. In FIG. 1, only one user terminal device 100 is shown, but actually, not a single user terminal device but a plurality of user terminal devices are connected to the relay device 1 via a wireless communication network. . Similarly, a plurality of Web servers 200 are connected to the relay device 1 via the Internet.

The processing unit 11 compresses or reduces the media data based on a predetermined format.
The transmission unit 12 transmits the media data compressed or reduced by the processing unit 11 to the user terminal device 100.
The receiving unit 13 receives data transmitted from the user terminal device 100.
The monitoring unit 14 monitors the traffic transfer or transmission status based on the operations of the transmission unit 12 and the reception unit 13.

  The processing unit 11 determines whether or not to compress or reduce the media data based on the traffic transfer or transmission status monitored by the monitoring unit 14. If the processing unit 11 determines to compress or reduce the media data, the processing unit 11 sets the compression rate or the reduction rate. The media data is compressed or reduced according to the determined compression rate or reduction rate.

  According to such a configuration, the relay device 1 compresses or reduces the media data at the compression rate or the reduction rate determined based on the traffic transfer or transmission status. Media data compressed or reduced at the compression rate or reduction rate can be transmitted to the user terminal device 100.

The processing unit 11 determines whether or not to compress or reduce the media data based on the traffic transfer or transmission status monitored by the monitoring unit 14, and determines that the compression or reduction is not performed. It is also possible to adopt a configuration that does not compress or reduce.
The transmission unit 12 transmits media data that has not been compressed or reduced to the user terminal device 100.

  For example, the processing unit 11 determines the state of the wireless communication network (for example, an extremely congested state, a congested state, or a quiet state) based on the traffic transfer or transmission status. Compress or reduce the media data at a high compression rate or reduction rate, compress or reduce the media data at a low compression rate or reduction rate in a congested state, and not compress or reduce the media data in a quiet state To process.

  According to such a configuration, the relay device 1 determines whether or not to compress or reduce the media data based on the traffic transfer or transmission status, and determines that compression or reduction is not performed, that is, When the communication environment is in a quiet state, the media data is transmitted to the user terminal device 100 without being compressed or reduced. Therefore, there is an advantage that unnecessary compression or reduction processing does not occur. Quality media data can be transmitted.

The relay device 1 may include a storage unit 15 that stores information on the user terminal device 100.
The processing unit 11 determines whether or not to compress or reduce the media data based on the traffic transfer or transmission status monitored by the monitoring unit 14 and the information of the user terminal device 100 stored in the storage unit 15. If it is determined that compression or reduction is performed, the compression rate or reduction rate is determined, and the media data is compressed or reduced according to the determined compression rate or reduction rate.
The information of the user terminal device 100 is, for example, a model name, an application name that uses the acquired media data, and the like.

The relay device 1 determines whether the user terminal device 100 can cope with the compression or reduction format adopted by the processing unit 11 based on the information of the user terminal device 100.
Therefore, the relay device 1 uses the compression rate or reduction rate determined based on the traffic transfer or transmission status on the condition that the user terminal device 100 supports the compression or reduction format adopted by the processing unit 11. The media data can be compressed or reduced, and the media data after the compression or reduction can be transmitted to the user terminal device 100.

  On the other hand, if the user terminal device 100 does not support the compression or reduction format adopted by the processing unit 11, the relay device 1 is not compressed or reduced media data regardless of the congestion degree of the communication environment. Is transmitted to the user terminal device 100.

When the media data is moving image data or audio data, the monitoring unit 14 calculates the throughput based on the transmission amount of the media data transmitted by the transmission unit 12 and the timing at which the transmission unit 12 transmits the media data And RTT (Round Trip Time) is calculated based on the timing at which the data transmitted from the user terminal device 100 is received by the receiving unit 13.
The processing unit 11 determines whether to compress or reduce the media data based on the throughput and the RTT, and determines the compression rate or the reduction rate when it is determined to compress or reduce the media data, and determines the determined compression rate or reduction. Compress or reduce media data by rate.

  RTT refers to the time from when a signal is issued until a response is returned. In this embodiment, the monitoring unit 14 uses the time taken from the transmission of the media data from the transmission unit 12 to the reception of the data (Ack data) returned from the user terminal device 100 by the reception unit 13 as RTT. calculate.

  Throughput is an actual speed when media data is transmitted from the transmission unit 12. In this embodiment, the monitoring unit 14 may calculate the throughput by calculating the actual speed from the data amount of the TCP transmission window, or may calculate the throughput (theoretical throughput) from the TCP transmission window size and the RTT. Good.

Also, moving image data or audio data cannot be comfortably reproduced on the user terminal device 100 unless the reproduction rate is satisfied. If only the throughput is reached, there is a possibility that the throughput from the Web server 200 may not be satisfied while the total throughput becomes a high value. Therefore, the monitoring unit 14 determines the compression rate or the reduction rate in consideration of the RTT and the throughput, and performs compression or reduction when the communication environment between the relay device 1 and the user terminal device 100 is congested.
For example, when transmitting moving image data, the relay device 1 calculates the throughput and the RTT at regular intervals (for example, at intervals of 5 seconds) as shown in FIG. 2, and based on the calculated throughput and the RTT, the media It is determined whether or not to compress or reduce data. When it is determined that the data is to be compressed or reduced, the compression rate or the reduction rate is determined, and the media data is compressed or reduced according to the determined compression rate or the reduction rate. To 100.

  Here, assuming an environment that is congested to some extent, playback stop when moving image data (hereinafter referred to as compressed or reduced data) compressed or reduced by deleting about 30% by the relay device 1 is played on the user terminal device 100. The number of times of reproduction and the number of reproduction stops when the user terminal device 100 reproduces moving image data that has not been compressed or reduced by the relay device 1 (hereinafter referred to as non-compressed or non-reduced data) will be described with reference to FIG. . The bandwidth limit was 600 Kbps. The total reproduction time of the moving image data is 2 minutes 44 seconds.

The average bit rate of uncompressed or non-reduced data is 720 Kbps. The average bit rate of the compressed or reduced data is 512 Kbps. The uncompressed or non-reduced data started to be played after about 11 seconds from the browsing request from the user terminal device 100. On the other hand, the compressed or reduced data started to be played about 10 seconds after the browsing request from the user terminal device 100.
The number of stop times of non-compressed or non-reduced data was 15. On the other hand, the number of stops of compression or reduction data was zero.
Therefore, it can be seen that the processing for compressing or reducing the media data is effective in order to eliminate or reduce the number of reproduction stops of the moving image data in a crowded environment.

  Further, the processing unit 11 refers to the table as shown in FIG. 4 based on the throughput and the RTT, and determines whether or not to compress or reduce the media data. A configuration for determining the reduction rate may be used. The table shown in FIG. 4 is an example, and the present invention is not limited to this. The table is stored in the storage unit 15. Further, “with compression” in FIG. 4 means “with compression or reduction”, and “without compression” means “without compression or reduction”. “High compression” means that the compression rate is high or the reduction rate is high, and “low compression” means that the compression rate is low or the reduction rate is low.

  According to such a configuration, the relay device 1 determines whether or not to compress or reduce moving image data or audio data based on the throughput and the RTT. Since the rate is determined and compressed or reduced according to the determined compression rate or reduction rate, the media data compressed or reduced at an appropriate compression rate or reduction rate is transmitted to the user terminal device 100 according to the congestion degree of the communication environment. can do.

When the media data is text data or still image data, the monitoring unit 14 transmits the media data by the transmission unit 12 and receives the data transmitted from the user terminal device 100 by the reception unit 13. Based on this, RTT is calculated. For example, the monitoring unit 14 calculates the RTT at the end of the transaction.
The processing unit 11 determines whether to compress or reduce the media data based on the RTT, and determines the compression rate or the reduction rate when it is determined to compress or reduce the media data. Compress or reduce media data.

  Specifically, the processing unit 11 refers to a table as shown in FIG. 5 based on the RTT and determines whether or not to compress or reduce the media data. Or the structure which determines a reduction rate may be sufficient. Note that the table shown in FIG. 5 is an example, and the present invention is not limited to this. The table is stored in the storage unit 15. Further, “with compression” in FIG. 5 means “with compression or reduction”, and “without compression” means “without compression or reduction”. “High compression” means that the compression rate is high or the reduction rate is high, and “low compression” means that the compression rate is low or the reduction rate is low.

  According to such a configuration, the relay device 1 determines whether or not to compress or reduce text data or still image data based on the RTT, and when it is determined to compress or reduce, the compression rate or the reduction rate And the media data compressed or reduced at an appropriate compression rate or reduction rate is transmitted to the user terminal device 100 in accordance with the degree of congestion in the communication environment. be able to.

  Further, as illustrated in FIG. 6, the processing unit 11 includes, for each user terminal device 100, an IP address, an RTT, a throughput, an entry lifetime (TTL, time to live), a wireless communication network state, and the like. Is created and stored in the storage unit 15. In the state of the wireless communication network, the congestion (Lv1) indicates, for example, a congestion state, and the congestion (Lv2) indicates an extremely congested state.

For example, in the case of moving image data, the processing unit 11 calculates the RTT and the throughput periodically (for example, at intervals of 5 seconds). Therefore, the RTT and the throughput of the record of the corresponding user terminal device 100 are periodically calculated. The lifetime of the entry and the state of the wireless communication network are updated.
Further, the processing unit 11 discards the record information when no new communication occurs and the lifetime of the entry becomes zero.

  The processing unit 11 decodes the media data transmitted from the Web server 200 in response to a request from the user terminal device 100, and converts the decoded media data based on the traffic transfer or transmission status monitored by the monitoring unit 14. It is determined whether to compress or reduce, and when it is determined to compress or reduce, the compression rate or reduction rate is determined, and the decoded media data is compressed or reduced (re-encoded) according to the determined compression rate or reduction rate. .

  If the processing unit 11 determines that the wireless communication network is in a quiet state based on the traffic transfer or transmission status, the user terminal device 100 does not decode the media data transmitted from the Web server 200. Send to.

  According to such a configuration, the relay device 1 determines the state of the wireless communication network (for example, an extremely congested state, a congested state, or a quiet state) based on the traffic transfer or transmission state, and according to the state. Thus, it is determined whether or not the media data needs to be re-encoded. If the media data is not necessary, the media data is transmitted to the user terminal device 100 without being re-encoded. Media data re-encoded with the reduction rate can be transmitted to the user terminal device 100.

  In the present embodiment, the configuration and operation of the relay device that compresses or reduces the media data at an appropriate compression rate or reduction rate have been described. The data may be configured as a method and a program for compressing or reducing data at an appropriate compression rate or reduction rate.

  Furthermore, the program for realizing the function of the relay device may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed.

  The “computer system” here includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a hard disk built in the computer system.

  Furthermore, “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It is also possible to include one that holds a program for a certain time, such as a volatile memory inside a computer system that becomes a server or client in that case. Further, the program may be for realizing a part of the above-described functions, and may be capable of realizing the above-described functions in combination with a program already recorded in the computer system. .

DESCRIPTION OF SYMBOLS 1 Relay device 11 Processing part 12 Transmission part 13 Reception part 14 Monitoring part 15 Storage part

Claims (6)

A processing unit that compresses or reduces media data based on a predetermined format;
A transmission unit that transmits the media data compressed or reduced by the processing unit to a user terminal device;
A receiving unit for receiving data transmitted from the user terminal device;
A monitoring unit that monitors traffic forwarding or transmission status based on the operation of the transmitting unit and the receiving unit;
When the media data is moving image data or audio data, the monitoring unit calculates a throughput based on a transmission amount of the media data transmitted by the transmission unit, and transmits the media data by the transmission unit. RTT (Round Trip Time) is calculated based on the timing and the timing at which the data transmitted from the user terminal device is received by the receiving unit,
The processing unit determines whether to compress or reduce the media data based on the throughput and the RTT , and determines the compression rate or the reduction rate when determining that the media data is to be compressed or reduced, and determines the determined compression rate. Or a transmitter that compresses or reduces media data according to a reduction rate. A processing unit that compresses or reduces media data based on a predetermined format;
A transmission unit that transmits the media data compressed or reduced by the processing unit to a user terminal device;
A receiving unit for receiving data transmitted from the user terminal device;
A monitoring unit that monitors traffic forwarding or transmission status based on the operation of the transmitting unit and the receiving unit;
When the media data is text data or still image data, the monitoring unit transmits the media data by the transmission unit and receives the data transmitted from the user terminal device by the reception unit. RTT (Round Trip Time) is calculated based on
The processing unit determines whether or not to compress or reduce the media data based on the RTT, and determines the compression rate or the reduction rate when determining to compress or reduce the media data, and determines the determined compression rate or reduction rate. Transmitter that compresses or reduces media data. Processing steps to compress or reduce media data based on a predetermined format;
A transmission step of transmitting the media data compressed or reduced by the processing step to the user terminal device;
A receiving step of receiving data transmitted from the user terminal device;
A monitoring step of monitoring traffic forwarding or transmission status based on the operations of the transmission step and the reception step, and
In the monitoring step, when the media data is moving image data or audio data, the throughput is calculated based on the transmission amount of the media data transmitted in the transmission step, and the media data is transmitted in the transmission step. RTT (Round Trip Time) is calculated based on the timing and the timing at which the data transmitted from the user terminal device is received in the receiving step,
The processing step determines whether to compress or reduce the media data based on the throughput and the RTT , and determines the compression rate or the reduction rate when it is determined to compress or reduce the media data. Alternatively, a data processing method for compressing or reducing media data according to a reduction rate. Processing steps to compress or reduce media data based on a predetermined format;
A transmission step of transmitting the media data compressed or reduced by the processing step to the user terminal device;
A receiving step of receiving data transmitted from the user terminal device;
A monitoring step of monitoring traffic forwarding or transmission status based on the operations of the transmission step and the reception step, and
In the monitoring step, when the media data is text data or still image data, the timing at which the media data is transmitted by the transmission step and the timing at which the data transmitted from the user terminal device is received by the reception step RTT (Round Trip Time) is calculated based on
The processing step determines whether to compress or reduce the media data based on the RTT, and determines the compression rate or the reduction rate when it is determined to compress or reduce, and determines the determined compression rate or reduction rate. Data processing method for compressing or reducing media data by means of
In a data transmission / reception system composed of a transmitter and a user terminal device,
The transmitter is
A processing unit that compresses or reduces media data based on a predetermined format;
A transmission unit for transmitting the media data compressed or reduced by the processing unit to the user terminal device;
A receiving unit for receiving data transmitted from the user terminal device;
A monitoring unit that monitors traffic forwarding or transmission status based on the operation of the transmitting unit and the receiving unit;
When the media data is moving image data or audio data, the monitoring unit calculates a throughput based on a transmission amount of the media data transmitted by the transmission unit, and transmits the media data by the transmission unit. RTT (Round Trip Time) is calculated based on the timing and the timing at which the data transmitted from the user terminal device is received by the receiving unit,
The processing unit determines whether to compress or reduce the media data based on the throughput and the RTT , and determines the compression rate or the reduction rate when determining that the media data is to be compressed or reduced, and determines the determined compression rate. Alternatively, a data transmission / reception system that compresses or reduces media data according to a reduction rate. In a data transmission / reception system composed of a transmitter and a user terminal device,
The transmitter is
A processing unit that compresses or reduces media data based on a predetermined format;
A transmission unit for transmitting the media data compressed or reduced by the processing unit to the user terminal device;
A receiving unit for receiving data transmitted from the user terminal device;
A monitoring unit that monitors traffic forwarding or transmission status based on the operation of the transmitting unit and the receiving unit;
When the media data is text data or still image data, the monitoring unit transmits the media data by the transmission unit and receives the data transmitted from the user terminal device by the reception unit. RTT (Round Trip Time) is calculated based on
The processing unit determines whether or not to compress or reduce the media data based on the RTT, and determines the compression rate or the reduction rate when determining to compress or reduce the media data, and determines the determined compression rate or reduction rate. Data transmission / reception system that compresses or reduces media data by

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