WO2002032083A1 - Systeme de controle de la qualite de la communication de donnees, systeme emetteur et recepteur - Google Patents
Systeme de controle de la qualite de la communication de donnees, systeme emetteur et recepteur Download PDFInfo
- Publication number
- WO2002032083A1 WO2002032083A1 PCT/JP2001/008996 JP0108996W WO0232083A1 WO 2002032083 A1 WO2002032083 A1 WO 2002032083A1 JP 0108996 W JP0108996 W JP 0108996W WO 0232083 A1 WO0232083 A1 WO 0232083A1
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- data
- receiver
- transmission
- transmission system
- communication quality
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- 230000006854 communication Effects 0.000 title claims abstract description 136
- 238000004891 communication Methods 0.000 title claims abstract description 135
- 238000003908 quality control method Methods 0.000 title claims description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 248
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000013500 data storage Methods 0.000 claims description 89
- 239000000872 buffer Substances 0.000 claims description 43
- 238000009825 accumulation Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 2
- 102100022907 Acrosin-binding protein Human genes 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
- H04L1/0018—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0032—Without explicit signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1438—Negotiation of transmission parameters prior to communication
- H04L5/1453—Negotiation of transmission parameters prior to communication of modulation type
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
Definitions
- the present invention relates to a data communication quality control system, a transmission system, and a receiver, for example, a base station that transmits content data such as an image or voice via a server, and a mobile phone that receives content data from the base station. It is suitable for application to a wireless communication system constructed with a wireless terminal.
- a wireless communication channel is established between the base station and the portable wireless terminal, and voice, text, image, or the like is transmitted via the wireless communication channel. It performs data communication for various application data. .
- the communication capacity is not constant because the transmission situation changes every moment due to various influences on the wireless communication path between the base station and the portable wireless terminal. Therefore, the wireless communication system transmits application data from the base station to the portable wireless terminal at a constant transmission rate set by the base station so that the bit error rate of data to be transmitted is equal to or less than a certain value. .
- the wireless communication system having such a configuration only the application data is transmitted from the base station to the portable wireless terminal at a transmission rate for reducing the bit error rate to a certain value or less. It does not support cases where data reliability is required even at low transmission speeds, or cases where high transmission speeds are required even when data reliability is low, and the communication quality desired by the user is not supported. It was not necessarily provided. Disclosure of the invention
- the present invention has been made in view of the above points, and is intended to propose a data communication quality control system, a transmission system, and a receiver that can guarantee the optimum communication quality according to the type of data. .
- the present invention provides a data communication quality control for controlling data communication quality between a transmission system for transmitting data and a receiver for receiving data from the transmission system via a predetermined communication path.
- the transmission system controls the data communication quality between the transmission system and the receiver by changing the modulation method according to the type of data to be transmitted to the receiver.
- data transmission from the transmission system to the receiver can be performed while maintaining a predetermined data communication quality using the most appropriate modulation scheme according to the type of data.
- the transmission system includes: According to the type of data to be transmitted to the receiver, the amount of data stored on the transmitting side, which is temporarily buffered when transmitting the data to the receiver, is adjusted.
- the data communication quality between the transmission system and the receiver is controlled by adjusting the amount of data stored on the receiving side that temporarily buffers the data to the same amount of data stored on the transmitting side. .
- the data can be read and decoded by the receiver at the optimum data read timing according to the type of data, and the underflow from the transmission system to the receiver can be performed while maintaining the data communication quality according to the type of data.
- Data transmission can be performed effectively without generating one or an overflow.
- a data communication product between a transmission system for transmitting data and a receiver for receiving data from the transmission system via a predetermined communication path.
- the transmitting system sends the data to the receiver by adjusting the number of retransmissions when transmitting the data to the receiver according to the type of data to be transmitted. The data communication quality between the system and the receiver is controlled.
- FIG. 1 is a schematic diagram illustrating an overall configuration of a wireless communication system according to an embodiment of the present invention.
- FIG. 2 is a schematic block diagram illustrating a circuit configuration of the wireless communication system according to the first embodiment.
- FIG. 3 is a characteristic curve diagram showing a relationship between CIR and a transmission speed.
- FIG. 4 is a flowchart showing a modulation control processing procedure according to the type of content by the portable wireless terminal.
- FIG. 5 is a flowchart showing a modulation control processing procedure according to the type of content by the transmission system.
- FIG. 6 ′ is a schematic line diagram showing a circuit configuration of the wireless communication system according to the second embodiment.
- FIG. 7 is a flowchart showing a buffer size control processing procedure according to the type of content.
- FIG. 8 is a characteristic curve diagram showing the relationship between the buffer size and the delay time.
- FIG. 9 is a characteristic curve diagram showing a relationship between the buffer size and the packet loss.
- FIG. 10 is a schematic block diagram illustrating a circuit configuration of a wireless communication system according to the third embodiment.
- Figure 11 is a flowchart showing the procedure for controlling the number of packet retransmissions according to the type of content. It is a low chart.
- FIG. 12 is a characteristic curve diagram showing the relationship between the number of packet retransmissions and the delay time.
- FIG. 13 is a characteristic curve diagram showing the relationship between the number of bucket retransmissions and bucket loss.
- reference numeral 1 denotes a wireless communication system as a data communication quality control system according to the present invention as a whole, and includes a transmission system 2 for transmitting contents and a receiver for receiving and displaying contents from the transmission system 2. And a portable wireless terminal 8.
- the transmission system 2 is constructed by a server 3 that provides the content and a base station 4 that transmits the content supplied from the server 3 to the portable wireless terminal 8, and the base station 4 and the portable wireless device are controlled by the server 3.
- the communication quality with the terminal 8 can be controlled.
- the mobile wireless terminal 8 is, for example, a mobile phone in a cellular system.
- the mobile wireless terminal 8 establishes a wireless channel with a base station 4 within a cell range in which the mobile wireless terminal 8 itself exists, and transmits contents from the server 3 ′ to the base station 4. It is designed to be received via.
- the server 3 first inputs the content data D 1 of the content to be transmitted (for example, a moving image, a still image, text or audio, etc.) to the encoding unit 11, and transmits the content to the encoding unit 11.
- the encoded data D 2 is generated by compressing and encoding the content data D 1 at a predetermined compression ratio designated by 14 and is supplied to the data accumulation unit 12 of the base station 4.
- the base station 4 stores the encoded data D 2 supplied from the encoding unit 11 of the server 3 in the data storage unit 12, and then sends it to the data transmission unit 13 as a system-side transmission unit.
- the data transmission unit 13 adds an error correction code to the encoded data D 2, forms a bucket with the error correction code, and modulates the encoded data D 2 with a modulation method according to the control signal S 1 from the transmission control unit 14 of the server 3.
- the transmission data D 3 is generated and transmitted to the portable wireless terminal 8 via the communication channel 15.
- the portable wireless terminal 8 receives the transmission data D3 by the data receiving unit 16 as a receiver-side receiving means, and performs demodulation processing and error correction processing as reception data D4 to obtain demodulation data D5.
- the data is temporarily stored in the storage unit 17 and then transmitted to the decoding unit 18.
- the data receiving unit 16 simultaneously detects the pilot signal included in the demodulated data D5, thereby detecting the CIR (Carrier-Interference Ratio) of the received data D4. ) And sends it to the reception control unit 20 of the microprocessor configuration as a CIR calculation result signal D5A.
- CIR Carrier-Interference Ratio
- the reception control unit 20 monitors the amount of data stored in the data storage unit 17 from the data reception unit 16 and when the amount of data that can be decoded by the decoding unit 18 is stored. The decoding timing is notified to the decoding unit 18.
- the decoding unit 18 decodes the demodulated data D5 according to the notification of the decode timing from the reception control unit 20, and sends the resulting decoded data D6 to the display unit 19, via the display unit 19 By displaying the contents of the contents, the user can view the contents.
- the reception control unit 20 calculates the bit error rate (Bit Error Rate) of the reception data D 4 received via the communication channel 15 as “1.0%” (standard). ), The CIR and the transmission as shown in the bar graph The transmission speed (kbps) relationship can be calculated according to a predetermined algorithm.
- the communication path 15 is set to 153.6.
- the bit error rate of the reception data D4 is set to "1.0"% (standard). It is thought that it can be suppressed to the following.
- bit error rate is suppressed to “10”% or less or “0.1”%, but in this case, the bit error rate is suppressed to “1.0”% (standard) or less. In comparison, there is a difference as to whether the required transmission rate is higher or lower as a whole.
- the reception control unit 20 may set the bit error rate to “1.0”% (standard) according to the type of content (moving image, still image, text or audio, etc.) requested to the transmission system 2, or Since the bit error rate can be less than 10%, high transmission speed is required, or high transmission speed is not required, but high reliability of 0.1% is required. Is determined as appropriate.
- the reception control unit 20 as the receiver-side transmitting means adjusts the bit error rate to “10%” or less at a new transmission rate detected according to the appropriately determined bit error rate (for example, when the CIR is 0 [dB]). 307.2 [kbps] if you want to suppress it, 76.8 [kbps] if you want to keep the bit error rate below 0.1% with CIR of 0 [dB])
- the request signal S4 is transmitted to the control means in the server 3 and the transmission control unit 14 as the system-side transmission means.
- the transmission control unit 14 of the server 3 transmits a modulation method (for example, BPSK (Binary Phase Shift Keying) that can transmit at the acquisition transmission rate requested by the request signal S4 from the reception control unit 20 of the portable wireless terminal 8. ), QPSK
- BPSK Binary Phase Shift Keying
- step SP 1 the base station 4 of the transmission system 2 transmits the transmission data D 3 including the pilot signal to the portable wireless terminal 8 by the data transmission unit 13, and proceeds to the next step SP 2 .
- step SP2 the mobile wireless terminal 8 detects a pilot signal in the received data D4 received by the data receiving unit 16, and then in step SP3, based on the pilot signal, Calculate the CIR at.
- step SP 4 the portable wireless terminal 8 calculates the transmission speed by the reception control unit 20 according to the relationship between the CIR and the transmission speed shown in FIG. 3 in order to suppress the bit error rate to less than 1.0% (standard). Move on to the next step SP5.
- step SP5 the mobile wireless terminal 8 keeps the bit error rate at “1.0”% according to the type of content (moving image data, text data, audio data, etc.) requested from the reception control unit 20 to the server 31. Power to reduce the transmission speed to less than “10%”, or to eliminate the need for high transmission speed, but to reduce the bit error rate to “0.1%” or less for high reliability.
- the transmission rate is corrected based on the determined bit error rate and CIR. I do. '
- step SP6 the mobile wireless terminal 8 requests the corrected transmission speed from the reception control unit 20 to the transmission control unit 14 of the server 3 from the reception control unit 20, and proceeds to the next step SP7.
- the transmission control unit 14 of the server 3 receives a request for the correction transmission rate from the portable wireless terminal 8.
- step SP8 the transmission control unit 14 of the server 3 determines a modulation method that can be transmitted at the corrected transmission rate, and outputs a control signal S1 indicating the modulation method to the data transmission unit 13 of the base station 4. Then, the transmission data D 3 is transmitted from the base station 4 to the portable wireless terminal 8 at the corrected transmission rate.
- step SP9 the mobile wireless terminal 8 receives the transmission data D3 transmitted from the base station 4 at the corrected transmission rate by the data receiving unit 16, thereby satisfying the optimal bit error rate for the type of content. Receiving data D4 can be obtained.
- step SP 11 the base station 4 of the transmission system 2 transmits the transmission data D 3 including the pit signal to the portable wireless terminal 8 by the data transmission unit 13, and proceeds to the next step SP 12. Move on.
- step SP12 the mobile wireless terminal 8 detects the pilot signal in the received data D4 by the data receiving unit 16, and then in step SP13, based on the pilot signal, The CIR in D4 is calculated, and this is notified to the reception control unit 20.
- step SP 14 the portable wireless terminal 8 controls the bit error rate to less than “1.0”% (standard) according to the relationship between the CIR and the transmission speed by the reception control unit 20. Calculate the transmission speed to use, and move to the next step SP15.
- step SP 15 the mobile wireless terminal 8 requests the transmission control unit 20 from the reception control unit 20 to the transmission control unit 14 of the server 3 for a transmission speed for suppressing the bit error rate to “1.0”% (standard) or less. Move on to the next step SP16.
- step SP 16 the transmission control unit 14 of the server 3 receives a request for the transmission speed from the mobile phone 8.
- step SP 17 the transmission control unit 14 of the server 3 determines the type of content (moving image data, text data, audio data, or the like) requested by the mobile wireless terminal 8 as requested by the mobile wireless terminal 8. Either leave the bit error rate at. ";!. 0 j%, require a high transmission speed by setting it to" 10% "or less, or do not need the high transmission speed. The rate is set to “0.1”% or less to determine whether high reliability is required, and the transmission rate is corrected based on the determined bit error rate and CIR.
- step SP 18 the transmission control section 14 of the server 3 determines a modulation scheme that can be transmitted at the corrected corrected transmission rate, and sends a control signal S 1 indicating the modulation scheme to the data transmission section 1 of the base station 4. 3 and the base station 4 notifies the portable radio terminal 8 of the determined correction transmission rate at the corrected transmission rate.
- step SP 19 the reception control section 20 of the portable wireless terminal 8 receives the notification of the corrected transmission rate, and estimates the modulation scheme in the data transmission section 13 of the base station 4 based on the corrected transmission rate. Then, preparations are made to perform demodulation processing using a demodulation method corresponding to the estimated modulation method.
- step SP 20 the transmission control unit 14 of the server 3 determines a modulation method that can be transmitted at the acquisition transmission rate, and outputs a control signal S 1 indicating the modulation method to the data transmission unit 13 of the base station 4. Then, the transmission data D 3 is transmitted from the base station 4 to the mobile wireless terminal 8 at the corrected transmission rate.
- step SP 21 the portable wireless terminal 8 receives the transmission data D 3 transmitted at the corrected transmission rate from the base station 4, and It is possible to obtain received data D4 satisfying the optimum bit error rate for the type of.
- the CIR of the received data D4 is calculated based on the pilot signal in the received data D4 received by the data receiving unit 16 of the portable wireless terminal 8, and the CIR and the transmission rate are calculated.
- the transmission rate is determined to keep the bit error rate below 1.0% (standard).
- the bit error rate is set to “1.0”%, “1” by the portable wireless terminal 8 or the transmission system 2 according to the type of content (moving image data, text data, audio data, etc.). It is determined to be either 10% or 0.1%, and the transmission rate is corrected based on the determined bit error rate and CIR.
- the transmission control unit 14 of the server 3 determines a modulation method that can be transmitted at the corrected transmission rate after the correction, and transmits a control signal S1 indicating the modulation method to the base station 4.
- the base station 4 transmits the transmission data D 3 to the portable wireless terminal 8 at the corrected transmission rate.
- the portable wireless terminal 8 can receive the transmission data D3 having the corrected transmission rate corrected in accordance with the type of the content from the base station 4 by the data receiving unit 16, and thus, Received data D4 that satisfies the required communication quality (bit error rate) can be obtained.
- the wireless communication system 20 is configured by a transmission system 30 and a portable wireless terminal 33 each including a server 31 and a base station 4.
- the server 31 of the transmission system 30 transmits the content of the content to be transmitted (for example, a moving image, a still image, text, or audio).
- Data D 1 is input to the encoder 1 1 and the transmission controller 3 2
- the base station 4 generates encoded data D 2 by compression-encoding the content data D 1 at a predetermined compression ratio specified by the base station 4 and supplies the encoded data D 2 to the data storage unit 12 of the base station 4. 31.
- the encoded data D 2 supplied from the encoding unit 11 is temporarily stored in the data storage unit 12 and then transmitted to the data transmission unit 13.
- the data transmission unit 13 adds an error correction code to the encoded data D2, forms a packet, modulates the packet with a predetermined modulation method, and generates transmission data D3.
- the data is transmitted to the portable wireless terminal 33 through 15.
- the portable wireless terminal 33 receives the transmission data D 3 by the data receiving unit 16, and performs demodulation processing and error correction processing as reception data D 4 to obtain demodulation data D 5, and the data storage unit 17 And then send it to the decoding unit 18.
- the reception control unit 34 monitors the amount of data stored in the data storage unit 17 from the data reception unit 16, and when the amount of data that can be decoded by the decoding unit 18 is stored, The decoding timing is notified to the decoding unit 18 concerned.
- the decoding unit 18 decodes the demodulated data D5 in accordance with the notification of the decoding timing from the reception control unit 20 and sends the resulting decoded data D6 to the display unit 19, via the display unit 19 By displaying the contents of the contents, the user can view the contents.
- the transmission control unit 32 of the server 31 can control the data storage amount of the coded data D2 stored in the data storage unit 12 of the base station 4 and operate in conjunction with the data storage unit 12
- the data storage amount of the demodulated data D5 in the data storage unit 17 of the portable wireless terminal 33 can be controlled.
- the buffer size control processing for the data storage units 12 and 17 is executed between the transmission system 30 and the portable wireless terminal 33 according to the procedure shown in FIG. '
- the portable wireless terminal 33 requests the content type from the reception control unit 20 to the transmission control unit 32 in the server 31 of the transmission system 30.
- step SP 31 the transmission control unit 32 of the server 31 sends the buffer size setting signal S 6 to the data storage unit 12 according to the type of the content, so that the encoded data for the data storage unit 12 is The data storage amount (buffer size) of D2 is set, and the buffer size setting signal S6 is also transmitted to the reception control unit 34 of the portable wireless terminal 33, so that the data storage unit 17 is Also specifies the same data storage amount as the data storage unit 12.
- step SP32 the portable wireless terminal 33 transmits the buffer size setting signal S6 from the reception control unit 34 to the data storage unit 17, thereby demodulating the data demodulated by the data reception unit 16.
- the data storage amount (buffer size) for storing the data D5 in the data storage unit 17 is set in the same manner as the data storage unit 12, and the process proceeds to the next step S, ⁇ 33.
- the setting of the data storage amount (buffer size) here means the data storage unit 1 2
- step SP33 the portable wireless terminal 8 sets the buffer size of the data storage unit 17 according to the specification from the server 31.Therefore, the reception control unit 34 requests the base station 4 to start content data communication. Through to server 31.
- step S ⁇ 34 the base station 4 starts buffering the encoded data D2 supplied from the encoding unit 11 of the server 31 to the data storage unit 12 and proceeds to the next step S ⁇ 35. Move on.
- step SP35 when the base station 4 reads the encoded data D2 from the data storage unit 12 by the data transmission unit 13, the base station 4 encodes the data storage amount set based on the buffer size setting signal S6. Timing when data D 2 is accumulated And performs modulation processing to start data transmission of transmission data D3.
- the portable wireless terminal 33 in step SP36 receives the transmission data D3 from the base station 4 as the reception data D4 by the data receiving unit 16, and proceeds to the next step SP37.
- the mobile wireless terminal 33 in step SP 37 reads from the read timing at which the demodulated data D 5 for the predetermined data storage amount will be stored in the data storage unit 17 in accordance with the buffer size specified by the server 31, Decoding section 18 starts decoding processing.
- the relationship between the buffer size and the delay time represents the probability of delay occurring when data is transmitted from the transmission system 30 to the portable wireless terminal 33 in units of delay time. It can be seen that it takes a long time to store and read the encoded data D 2, and when the buffer size is set small, it takes only a short time to store and read the encoded data D 2.
- a bucket loss occurs for the received data D 4 received by the data receiving unit 16 of the portable wireless terminal 33.
- the probability of the ratio is expressed in the unit of the ratio.As the buffer size decreases, the probability of packet loss increases, and as the buffer size increases, the probability of bucket loss decreases. Can be read.
- the transmission control unit 32 of the server 31 set the buffer sizes of the data storage unit 12 of the base station 4 and the data storage unit 17 of the portable wireless terminal 33 to the same data storage amount.
- the data read timings from the data storage unit 12 and the data storage unit 17 are also the same. That is, when the buffer size of the data storage unit 12 of the base station 4 and the data storage unit 17 of the portable wireless terminal 33 is set to be larger than the normal standard size, the communication path 15 from the base station 4 is established.
- Step SP 35, Step SP 36 and Step SP 37 the data transmission speed is reduced due to the deterioration of the communication condition on the communication path 15, and the data storage section 17 of the portable wireless terminal 33 is Even if a sufficient amount of data is not stored, the readout timing for decoding is delayed by the setting of the large batsa size, so that the probability of occurrence of an underflow is reduced.
- the buffer size of the data storage unit 12 of the base station 4 and the buffer size of the data storage unit 17 of the portable wireless terminal 33 is set smaller than the normal standard size, communication from the base station 4 is performed.
- the data transmission to the portable wireless terminal 33 starts via the channel 15 (step SP35, step SP36, and step SP37), the data is transmitted due to the deterioration of the communication condition on the communication channel 15. If the transmission speed drops and the data storage unit 17 of the portable wireless terminal 33 does not store a sufficient data storage amount, the reading timing for decoding is earlier due to the smaller buffer size, and the data is underwritten. The flow is likely to occur.
- the transmission control unit 32 of the server 31 controls the data storage amount for the data storage unit 12 and the data storage unit 12 for the data storage unit 17 of the portable wireless terminal 33 according to the type of content.
- the time required from data storage to reading can be adjusted, so that even if the data transmission speed on the communication channel 15 decreases, underflow can be prevented and decoding errors can be further reduced. I have.
- the transmission control unit 32 of the server 31 stores the data in the data storage unit of the base station 4 in accordance with the type of content (moving image data, text data, voice data, etc.) requested by the portable wireless terminal 33.
- the transmission control unit 32 of the server 3 1 Although the delay time of the transmission data D 3 up to 3 becomes shorter, if the transmission speed is reduced due to the deterioration of the communication condition on the communication channel 15, the data is demodulated to the data storage unit 17 of the portable wireless terminal 33. Since reading for decoding is performed in a situation where the data D5 is not sufficiently accumulated, an underflow may occur.
- the transmission control unit 32 of the server 31 will transmit from the base station 4 to the portable radio.
- the delay time of the transmission data D3 to the terminal 33 becomes longer, even when the transmission speed is reduced due to the deterioration of the communication conditions on the communication path 15, the read timing is longer than when the buffer size is set smaller. Since it is slower than that, even if reading for decoding is performed from the data storage unit 17, the probability of underflow can be reduced.
- the transmission control unit 32 of the server 31 determines the buffer size in the data storage unit 12 and the data storage unit 17 when highly reliable data communication is required according to the type of content. If a high setting is required and high-speed communication with a shorter delay time than reliability is required, the buffer sizes in the data storage units 12 and 17 can be set small to allow the portable wireless terminal 33 It provides optimal communication quality according to the type of specified content.
- the wireless communication system 20 is controlled by the transmission control unit 32 of the server 31 to store the data of the data storage unit 12 of the base station 4 and the data storage unit of the portable wireless terminal 33 according to the type of content.
- the wireless communication system 40 is configured by a transmission system 50 including a server 51 and a base station 4 and a portable wireless terminal 53.
- the server 51 of the transmission system 50 transmits the content (for example, moving image, still image, text or audio, etc.) to be transmitted.
- the content data D 1 is input to the encoding unit 11, and the encoded data D 2 is generated by compression-encoding the content data D 1 at a predetermined compression ratio specified by the transmission control unit 52, and this is used as a base.
- the base station 4 stores the encoded data D 2 supplied from the encoding unit 11 of the server 51 in the data storage unit 12, and then sends it to the data transmission unit 13.
- the data transmission unit 13 adds an error correction code to the encoded data D2, forms a packet, modulates the packet with a predetermined modulation method, and generates transmission data D3. It transmits to the portable wireless terminal 53 via 15.
- the portable wireless terminal 53 receives the transmission data D 3 by the data receiving unit 16, and performs demodulation and error correction as reception data D 4 to obtain demodulated data D 5, which is stored in the data storage unit 17. Once stored, it is sent to the decoding unit 1.8.
- the reception control unit 54 monitors the amount of data stored in the data storage unit 17 from the data reception unit 16 and when the amount of data that can be decoded by the decoding unit 18 is stored. Then, the decoding timing is notified to the decoding section 18 concerned.
- the decoding unit 18 decodes the demodulated data D5 according to the notification of the decoding timing from the reception control unit 54, and sends the resulting decoded data D6 to the display unit 19, via the display unit 19 By displaying the contents of the contents, the user can view the contents.
- the transmission control unit 52 of the server 51 sends a retransmission control signal S 8 to the data transmission unit 13 of the base station 4 according to the type of content requested from the portable wireless terminal 33.
- the number of packet retransmissions of the transmission data D3 to be transmitted from the data transmission unit 13 can be controlled.
- the data storage unit 12 of the base station 4 has a data storage capacity that does not cause an overflow even when the data transmission unit 13 retransmits the packet a predetermined number of times.
- step SP41 the portable wireless terminal 53 requests the type of content from the reception control unit 54 to the transmission control unit 52 in the server 51 of the transmission system 50.
- step SP42 the transmission control unit 52 of the server 51 outputs the retransmission control signal S8 corresponding to the specified type of content to the data transmission unit 13 of the base station 4,
- the number of packet retransmissions in the data transmission unit 13 is set according to the type of content.
- step SP43 the data transmission unit 13 of the base station 4 starts the data communication process by reading the encoded data D2 from the data storage unit 12 and performing modulation processing in the data transmission unit 13. Move on to the next step SP44.
- step SP44 the data transmission unit 13 of the base station 4 performs packet retransmission according to the type of content to be transmitted based on the retransmission control signal S8 specified by the transmission control unit 52 of the server 51.
- the data transmission is executed by repeatedly retransmitting the packet of the transmission data D3 by the number of times.
- step SP45 the data receiving section 16 of the portable wireless terminal 53 receives the transmission data D3.
- the delay time required to obtain accurate decoded data D6 tends to increase as the number of packet retransmissions of transmission data D3 increases, and the delay time decreases as the number of packet retransmissions decreases. Tends to be shorter.
- the packet loss tends to decrease as the number of packet retransmissions of the transmission data D3 increases, and the bucket loss increases as the number of packet retransmissions decreases. .
- step SP46 the decoding unit 18 of the portable wireless terminal 53 starts decoding, but if the number of bucket retransmissions is small at this time, although the delay time until the decoding result is obtained is short, the packet retransmission Due to the small number of times, decoding error is likely to occur.
- the decoding section 18 has a long delay time until a decoding result is obtained, but since the number of bucket retransmissions is large, the probability of occurrence of a decode error is low and the decoded data Can be restored. (4-3) Operations and effects.
- the transmission control unit 52 of the server 51 sends the data transmission unit of the base station 4 according to the type of content (moving image data, text data, audio data, etc.) requested by the portable wireless terminal 53. Controls the number of packet retransmissions of transmission data sent from 13 on.
- the transmission control unit 52 of the server 51 sets a large number of bucket retransmissions when high-reliability data communication is required according to the type of content, and provides high-speed communication with a shorter delay time than reliability.
- the number of retransmissions of the bucket is set to a small value, an optimum communication quality can be guaranteed for the mobile wireless terminal 53 in response to a request for a specified content type.
- the wireless communication system 20 controls the number of bucket retransmissions by the data transmission unit 13 of the base station 4 by the transmission control unit 52 of the server 51 according to the type of content.
- the mobile communication terminal 33 can always guarantee the optimum communication quality according to the type of content.
- control is performed by combining the modulation scheme and the buffer size, or the modulation scheme and the number of retransmissions are controlled. Alternatively, control may be performed by combining retransmission times, control may be performed by combining a buffer size and the number of retransmissions, or retransmission time, or control may be performed by combining all of a modulation scheme, a buffer size, and the number of retransmissions or retransmission time.
- the amount of data stored in the data storage unit 12 and the data storage unit 17 (buffer) according to the type of content requested by the portable wireless terminals 3 and 3 as receivers
- the present invention is not limited to this.
- the present invention is not limited to this, and the data error rate (packet loss) of the reception data D 4 that is fed back by the reception control unit 34 of the portable radio terminal 33 is described.
- the data storage amount (buffer size) may be set according to the above.
- the present invention is not limited to this, and the packet retransmission The number of packet retransmissions may be controlled as a result by adjusting the packet retransmission time required for.
- the present invention is not limited to this, and the demodulated data D 5 is transmitted to the reception control unit 54.
- the CIR may be transmitted, and the reception control unit 54 may calculate the CIR.
- the present invention is not limited to this, and the transmission control units 14, 32, and 52 may be provided in the base station 4, or may be provided in the general base station that controls the base station 4 and other base stations. It may be provided.
- radio communication is not limited to this.
- Various other receivers such as a PDA (Personal Digital Assistant) having a communication function and a personal computer may be used.
- PDA Personal Digital Assistant
- a data communication quality control system capable of executing data transmission from a transmission system to a receiver while maintaining a predetermined data communication quality by using the most appropriate modulation scheme according to the type of data , A transmission system and a receiver can be realized.
- data can be read and decoded by a receiver at an optimum data read timing according to the type of data, so that transmission can be performed while maintaining data communication quality according to the type of data. It is possible to realize a data communication quality control system, a transmission system, and a receiver that can effectively execute data transmission without causing underflow or overflow from the system to the receiver. Further, according to the present invention, a data communication quality control system capable of executing data transmission from a transmission system to a receiver while maintaining a predetermined data communication quality by the most appropriate number of data retransmissions according to the type of data, A system and a receiver can be realized. Industrial applicability
- the data communication quality control system, the transmission system, and the receiver of the present invention are applied to, for example, a wireless communication system that controls communication quality when transmitting content from a server to a portable wireless terminal via a base station. .
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2002535353A JPWO2002032083A1 (ja) | 2000-10-13 | 2001-10-12 | データ通信品質制御システム、送信システム及び受信機 |
EP01976676A EP1233594B1 (en) | 2000-10-13 | 2001-10-12 | Data communication quality control system, transmitter system and receiver |
US10/149,993 US7072662B2 (en) | 2000-10-13 | 2001-10-12 | Data communication quality control system, transmitter system and receiver |
AU2001295923A AU2001295923A1 (en) | 2000-10-13 | 2001-10-12 | Data communication quality control system, transmitter system and receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US24018200P | 2000-10-13 | 2000-10-13 | |
US60/240,182 | 2000-10-13 |
Publications (1)
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WO2002032083A1 true WO2002032083A1 (fr) | 2002-04-18 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2001/008995 WO2002032082A1 (fr) | 2000-10-13 | 2001-10-12 | Systeme de commande de la vitesse de communication de donnees, appareil emetteur et appareil recepteur |
PCT/JP2001/008997 WO2002032175A1 (fr) | 2000-10-13 | 2001-10-12 | Systeme de communication radio, et procede et dispositif de commande de transmission |
PCT/JP2001/008996 WO2002032083A1 (fr) | 2000-10-13 | 2001-10-12 | Systeme de controle de la qualite de la communication de donnees, systeme emetteur et recepteur |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2001/008995 WO2002032082A1 (fr) | 2000-10-13 | 2001-10-12 | Systeme de commande de la vitesse de communication de donnees, appareil emetteur et appareil recepteur |
PCT/JP2001/008997 WO2002032175A1 (fr) | 2000-10-13 | 2001-10-12 | Systeme de communication radio, et procede et dispositif de commande de transmission |
Country Status (5)
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US (2) | US7369497B2 (ja) |
EP (2) | EP1233594B1 (ja) |
JP (4) | JPWO2002032083A1 (ja) |
AU (3) | AU2001295923A1 (ja) |
WO (3) | WO2002032082A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
WO2002032082A1 (fr) | 2002-04-18 |
EP1233594B1 (en) | 2011-12-07 |
JP4048483B2 (ja) | 2008-02-20 |
EP1233594A1 (en) | 2002-08-21 |
EP1237345B1 (en) | 2012-12-12 |
AU2001295923A1 (en) | 2002-04-22 |
US7369497B2 (en) | 2008-05-06 |
JP2007251978A (ja) | 2007-09-27 |
JP4518279B2 (ja) | 2010-08-04 |
US20020191722A1 (en) | 2002-12-19 |
AU2001295924A1 (en) | 2002-04-22 |
US7072662B2 (en) | 2006-07-04 |
AU2001295922A1 (en) | 2002-04-22 |
JP2007189745A (ja) | 2007-07-26 |
US20020183026A1 (en) | 2002-12-05 |
EP1233594A4 (en) | 2006-08-02 |
JPWO2002032083A1 (ja) | 2004-02-26 |
WO2002032175A1 (fr) | 2002-04-18 |
JPWO2002032082A1 (ja) | 2004-02-26 |
EP1237345A4 (en) | 2005-09-14 |
EP1237345A1 (en) | 2002-09-04 |
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