WO2011158467A1 - データ送信装置及びデータ送信方法 - Google Patents
データ送信装置及びデータ送信方法 Download PDFInfo
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- WO2011158467A1 WO2011158467A1 PCT/JP2011/003231 JP2011003231W WO2011158467A1 WO 2011158467 A1 WO2011158467 A1 WO 2011158467A1 JP 2011003231 W JP2011003231 W JP 2011003231W WO 2011158467 A1 WO2011158467 A1 WO 2011158467A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/16—Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
- G06F15/163—Interprocessor communication
- G06F15/173—Interprocessor communication using an interconnection network, e.g. matrix, shuffle, pyramid, star, snowflake
- G06F15/17306—Intercommunication techniques
- G06F15/17312—Routing techniques specific to parallel machines, e.g. wormhole, store and forward, shortest path problem congestion
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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
- H04L1/187—Details of sliding window management
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- 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
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
Definitions
- the present invention relates to a data transmission device and a data transmission method, and more particularly to a data transmission device and a data transmission method for power saving in a communication network.
- Patent Document 1 describes a data transmission control method capable of power control using an acknowledgment via a wireless link.
- the data transmission control method described in Patent Literature 1 compares the reception amount of the reception confirmation response (Ack) predicted when data of a certain transmission size is transferred with the actual Ack reception amount, and transmits according to the comparison result. Control power.
- Ack reception confirmation response
- FIG. 1 is a flowchart showing a data transmission control method described in Patent Document 1.
- step S3 it is determined whether or not an Ack for the transmitted data has been received.
- the packet error rate PER Packet Error Rate
- step S7 compares PER with two threshold values, the first threshold value and the second threshold value.
- the two threshold values have a relationship of first threshold value> second threshold value. If the PER is larger than the first threshold, that is, if the PER is high, the transmission power is increased in step S8, and the second threshold is compared with PER in step S10. If the PER is smaller than the second threshold, control is performed to reduce the transmission power in step S11.
- TCP Transmission Control Protocol
- TCP adopts the concept of window to control the flow of data transmission / reception.
- TCP flow control is adjusted so that no more data is sent to the receiving side by transmitting the receiving window (generally equivalent to the free capacity of the TCP receiving buffer on the receiving side) to the transmitting side.
- the reception window is stored in the “window size” field of the TCP header, and is notified using an Ack packet (acknowledgment) from the reception side to the transmission side.
- the TCP header further has a field of an Ack number (the number of data to be received next), and the receiving side uses the Ack number field of the Ack packet to notify the transmitting side at the same time how much data has been received.
- the transmission side monitors Ack knows the upper limit of the data size that can be transmitted at one time from the relationship between the transmitted data size, the reception window notified by Ack, and the Ack number, and does not transmit beyond that upper limit. Like that.
- the size of data that can be transmitted without waiting for the Ack determined on the transmission side refers to the transmission window size.
- the transmission side sequentially transmits data for the transmission window size in units of packets.
- FIG. 2 is a control sequence diagram showing TCP transmission / reception control.
- FIG. 2A shows transmission / reception control when communication is normally performed, and
- FIG. 2B shows transmission / reception control when packet loss occurs.
- DATAn represents the nth packet data.
- ACKn is Ack notifying that the nth packet data has been received.
- the TCP slow start control is performed to update and transmit the packet number (DATA1 to ACK10) every time the Ack has been received. Done. After that, when the transfer goes on track, the receiving side transmits Ack once for reception of packet data multiple times instead of every time (DATA 11 and later).
- FIG. 2A shows an example in which one Ack is transmitted with respect to the reception of packet data twice.
- the receiving side informs the transmitting side of the packet data loss. Specifically, the receiving side transmits duplicate Ack (duplicate Ack) every time it receives packet data until it receives lost packet data.
- FIG. 2 (b) shows an example of the duplicate Ack transmission.
- the receiving side receives DATA12 instead of the DATA11 packet data to be received next. Therefore, the receiving side transmits Ack for notifying that ACK 10 (10th packet) has been received after reception of DATA 12 every time it receives packet data.
- the conventional technology has a problem that it cannot solve the increase in load on the transmission side and the increase in power consumption of the reception side terminal due to an increase in the number of times of duplicate Ack transmission on the reception side.
- the number of times of transmission of duplicate Ack on the receiving side increases.
- An object of the present invention is to suppress the occurrence of packet data loss at the initial stage of transfer, reduce the number of duplicate Ack transmissions on the reception side, reduce the load on the transmission side, and reduce the power consumption of the reception side terminal.
- the data transmission device of the present invention includes a transmission buffer for buffering transmission data, a transmission window size setting unit for setting a transmission window size for the transmission buffer, and transmission for the transmission window size set in the transmission window size setting unit.
- a transmission amount analysis unit that analyzes the amount of packet data that has been transmitted, a transmission parameter setting unit that sets transmission parameters when sending transmission data according to the result of the transmission amount analysis unit, and reads transmission data from the transmission buffer
- the configuration includes a transmission control unit that transmits transmission data based on the transmission parameter, and a data transmission unit that transmits transmission data received from the transmission control unit.
- the data transmission method of the present invention is a data transmission method of a data transmission apparatus for transmitting transmission data, the step of buffering transmission data, the step of setting a transmission window size for the transmission buffer, and the set Analyzing the amount of transmitted packet data with respect to the transmission window size; setting a transmission parameter when transmitting the transmission data according to the analysis result; reading the transmission data from the transmission buffer; Transmitting transmission data based on the transmission data, and transmitting transmission data received from the transmission control unit.
- the present invention when data corresponding to the transmission window size is transferred, packet data loss at the initial transfer stage can be suppressed. As a result, an increase in the number of duplicate Ack transmissions on the reception side can be suppressed, and the load on the transmission side can be reduced and the power consumption of the reception side terminal can be reduced.
- FIG. 1 Flow chart showing conventional data transmission control method Control sequence diagram showing conventional TCP transmission / reception control
- the figure which shows an example of the system configuration to which the data transmission apparatus which concerns on Embodiment 1 of this invention is applied.
- the figure which shows an example of the system configuration to which the data transmission apparatus which concerns on the said Embodiment 1 is applied.
- the figure which shows the structure of the data transmitter which concerns on the said Embodiment 1.
- FIG. The figure explaining the transmission window size set to the transmission buffer of the data transmitter which concerns on the said Embodiment 1.
- FIG. The flowchart which shows the transmission control of the data transmitter which concerns on the said Embodiment 1.
- FIG. The flowchart which shows the transmission parameter setting process of the transmission parameter setting part of the data transmitter which concerns on the said Embodiment 1.
- FIG. 1 The figure which shows the table which sets the setting value of the transmission parameter based on the ratio of the transmitted data amount of the data transmission apparatus which concerns on the said Embodiment 1.
- FIG. 1 The figure which shows the setting table which the transmission parameter instruction
- Control sequence diagram showing TCP transmission / reception control of the data transmission apparatus according to the first embodiment The block diagram which shows the structure of the data transmitter which concerns on Embodiment 2 of this invention.
- (Embodiment 1) 3 and 4 are diagrams showing an example of a system configuration to which the data transmission apparatus according to Embodiment 1 of the present invention is applied.
- FIG. 3 shows an example of a system configuration in which the server 11 and the terminal 12 such as a mobile phone are directly connected. Data is transmitted from the server 11 on the transmission side to the terminal 12 on the reception side, and the terminal 12 receives the data from the server 11.
- the receiving terminal 12 is, for example, a portable terminal, and power saving is required.
- FIG. 4 shows an example of a system configuration in which the server 21 and the access point 22 are connected, and a terminal 23 such as a mobile phone relays the access point 22 and connects to the server 21. Data is transmitted from the transmission-side server 21 to the reception-side terminal 23 via the access point 22, and the terminal 23 receives data from the server 21.
- FIG. 5 is a diagram showing the configuration of the data transmission apparatus according to Embodiment 1 of the present invention.
- the data transmission apparatus according to the present embodiment is an example applied to the data transmission apparatus having the system configuration shown in FIGS.
- the data transmission apparatus of this Embodiment can be applied to the transmission terminal of a home network.
- the data transmission apparatus 100 includes a transmission buffer 101, a transmission window size setting unit 102, an Ack reception unit 112, a transmission amount analysis unit 103, a transmission parameter instruction unit 104, a transmission power instruction unit 105, a modulation scheme code.
- the Ack signal 111 is input to the Ack receiving unit 112.
- the Ack reception unit 112 receives the Ack signal 111 and outputs it to the transmission power instruction unit 105 and the modulation scheme coding rate instruction unit 106.
- the data transmitting apparatus 100 changes the transmission parameter according to the packet data transmission amount with respect to the transmission window size, and transmits the transmission data.
- the transmission buffer 101 buffers transmission data from a memory not described in FIG.
- the memory is connected to the transmission buffer 101 and sequentially transfers the held transmission data to the transmission buffer 101.
- the transmission window size setting unit 102 sets a transmission window size for the transmission buffer 101.
- FIG. 6 is a diagram for explaining a transmission window size set in the transmission buffer 101.
- the transmission window size is set in accordance with, for example, the buffer capacity on the reception side acquired from the reception side when establishing a communication connection.
- the transmission amount analysis unit 103 analyzes the amount of transmitted packet data with respect to the transmission window size set in the transmission window size setting unit 102.
- the transmission parameter instruction unit 104 instructs the parameter setting value to the transmission parameter setting unit 107 according to the result of the transmission amount analysis unit 103.
- the transmission parameter instruction unit 104 instructs the transmission parameter setting unit 107 to specify different transmission power, modulation scheme, and coding rate according to the ratio of the amount of transmitted packet data to the transmission window size.
- the transmission parameter instruction unit 104 includes a transmission power instruction unit 105 and a modulation scheme coding rate instruction unit 106.
- the transmission power instruction unit 105 receives information on the ratio of the transmitted data amount from the transmission amount analysis unit 103.
- the transmission power instruction unit 105 instructs the transmission power setting unit 108 on the transmission power setting value based on the ratio of the received transmitted data amount.
- the modulation scheme coding rate instruction unit 106 receives information on the ratio of the transmitted data amount from the transmission amount analysis unit 103.
- the modulation scheme coding rate instruction unit 106 instructs the modulation scheme coding rate setting unit 109 on the modulation scheme and coding rate based on the ratio of the received transmitted data amount.
- the transmission parameter setting unit 107 sets the transmission parameter instructed by the transmission parameter instruction unit 104.
- Transmission parameter setting section 107 sets transmission parameters when transmission data is transmitted by transmission control section 110.
- the transmission parameter setting unit 107 includes a transmission power setting unit 108 and a modulation scheme coding rate setting unit 109.
- the transmission power setting unit 108 receives the transmission power setting value from the transmission power instruction unit 105 and sets the value.
- the modulation scheme coding rate setting unit 109 receives the modulation scheme and coding rate setting values from the modulation scheme coding rate instruction unit 106 and sets the values.
- the transmission control unit 110 reads transmission data from the transmission buffer 101 and controls transmission data based on the setting of the transmission parameter setting unit 107.
- the data transmission unit 120 transmits the transmission data received from the transmission control unit 110.
- the transmission control unit 110 may be connected to a network interface unit (not shown).
- the network interface unit is connected to the transmission control unit 110 and an external access point, and transmits transmission data sent from the transmission control unit 110 to the external access point.
- the data transmission apparatus 100 is instructed by the transmission parameter instruction unit 104 and the transmission parameter instruction unit 104 which instruct the parameter setting value to the transmission parameter setting unit 107 according to the result of the transmission amount analysis unit 103.
- the transmission parameter instruction unit 104 indicates the parameter setting value, and the transmission parameter setting unit 107 sets the instructed parameter, thereby enabling the following transmission control.
- the transmission parameter setting unit 107 sets the instructed parameter, thereby enabling the following transmission control.
- FIG. 7 is a flowchart showing transmission control of the data transmission apparatus 100.
- step S101 the transmission buffer 101 performs initial setting for buffering transmission data.
- the transmission window size setting unit 102 performs initial setting for setting a transmission window size determined by TCP flow control.
- step S102 the transmission power instruction unit 105 and the modulation scheme coding rate instruction unit 106 perform initial setting of the transmission power and modulation scheme.
- step S103 the transmission buffer 101 performs data packet transmission.
- step S104 the transmission amount analysis unit 103 determines whether or not all data transfer is completed. If all data transfer is complete, this flow ends.
- the transmission amount analysis unit 103 calculates the ratio of the transmitted data amount to the transmission window size from the transmission data amount read from the transmission buffer 101 and the transmission window size set by the transmission window size setting unit 102.
- step S105 the transmission parameter instruction unit 104 determines whether packet loss has occurred. The occurrence of packet loss is determined by, for example, no update of the Ack number. If there is a packet loss, the transmission parameter instruction unit 104 proceeds to step S106. If there is no packet loss, the transmission parameter instruction unit 104 proceeds to step S108.
- step S106 the transmission amount analysis unit 103 calculates the transmitted data amount for the transmission window.
- step S107 the transmission parameter instruction unit 104 determines whether it is a setting update timing. If it is not the setting update timing, the process returns to step S103, and if it is the setting update timing, the process proceeds to step S108.
- step S108 the transmission parameter instruction unit 104 sets the transmission parameter and returns to step S103.
- FIG. 8 is a flowchart showing the transmission parameter setting process of the transmission parameter setting unit 107.
- the flowchart showing the transmission parameter setting process in FIG. 8 is a subroutine of step S108 in FIG.
- the transmission power instruction unit 105 and the modulation scheme coding rate instruction unit 106 receive information on the ratio of the transmitted data amount from the transmission amount analysis unit 103.
- step S201 the transmission power instruction unit 105 instructs the transmission power setting unit 108 about the transmission power setting value.
- the transmission power setting unit 108 receives the transmission power setting value from the transmission power instruction unit 105 and sets the value.
- FIG. 9 is a diagram showing a table for setting transmission parameter setting values based on the ratio of transmitted data amount.
- the setting table shown in FIG. 9 sets a transmission power, a modulation method, and a coding rate for each ratio of the transmitted data amount.
- the transmission power instruction unit 105 instructs the transmission power setting unit 108 to set the transmission power with reference to the setting table shown in FIG. Specifically, for example, the transmission power instruction unit 105 sets the maximum transmission power if the received information on the ratio of the transmitted data amount is 0% or more and less than 25%, and the maximum value if the information is 25% or more and less than 50%. Is instructed to set a transmission power of 90%. Further, the transmission power instruction unit 105 instructs the transmission power setting unit 108 to set the transmission power based on the ratio of the received transmitted data amount. Specifically, the transmission power instruction unit 105 sets the transmission power of 80% of the maximum value to 75% or more and 100% or less if the information on the ratio of the received transmitted data amount is 50% or more and less than 75%.
- the transmission power instruction unit 105 first increases the transmission power set in advance by, for example, 20-30%, and decreases it step by step according to the ratio of the amount of transmitted data received. It may be returned to the transmitted power.
- the transmission power instruction unit 105 may change the setting value so that the transmission power becomes stronger when packet data loss occurs due to transmission with the instructed setting value.
- the transmission power instruction unit 105 sets the transmission power to be set to 62% of the maximum value and the transmission power becomes strong. Update. Note that, when packet loss occurs again, the transmission power instruction unit 105 updates the setting value so that the transmission power is further increased to 64%.
- the modulation scheme coding rate instruction unit 106 instructs the modulation scheme coding rate setting unit 109 on the modulation scheme and the coding rate based on the ratio of the received transmitted data amount.
- Modulation scheme coding rate setting section 109 receives the modulation scheme and coding rate setting values from modulation scheme coding rate instruction section 106 and sets the values.
- the modulation scheme coding rate instruction unit 106 instructs the modulation scheme coding rate setting unit 109 on the modulation scheme conditions, for example, with reference to the setting table shown in FIG. Specifically, the modulation scheme coding rate instruction unit 106 modulates BPSK as the modulation scheme and 3/4 as the coding rate if the information of the ratio of the received transmitted data amount is 0% or more and less than 25%. It instructs the modulation scheme coding rate setting section 109 as a scheme condition. Also, the modulation scheme coding rate instruction unit 106 sets QPSK as the modulation scheme, 3/4 as the coding rate, and modulation scheme coding if the information on the ratio of the received transmitted data amount is 25% or more and less than 50%. The rate setting unit 109 is instructed.
- the modulation scheme coding rate instruction unit 106 sets the modulation scheme to 16-QAM, the coding rate to 3/4, and the modulation scheme if the information on the ratio of the received transmitted data amount is 50% or more and less than 75%.
- the coding rate setting unit 109 is instructed.
- the modulation scheme coding rate instruction unit 106 sets 64-QAM as the modulation scheme and 3/4 as the coding rate if the information on the ratio of the received transmitted data amount is 75% or more and 100% or less. Then, it instructs the modulation scheme coding rate setting unit 109.
- the modulation scheme coding rate instruction unit 106 changes the setting value so that error tolerance is increased when packet data loss occurs due to transmission with the specified setting value.
- the modulation scheme coding rate instructing unit 106 uses 64-QAM as a modulation scheme and encoding when a packet data loss occurs with a setting value where the modulation scheme is 64-QAM and the coding rate is 3/4. The rate is updated to 2/3, which is a set value with increased error tolerance. Also, when packet data loss occurs again, the modulation scheme coding rate instruction unit 106 updates the modulation scheme to 16-QAM, the coding rate to 3/4, and a setting value that further enhances error tolerance. .
- the transmission power instruction unit 105 and the modulation scheme coding rate instruction unit 106 determine the occurrence of packet data loss according to the TCP flow control operation that detects the reception of duplicate Ack. Specifically, the transmission power instruction unit 105 and the modulation scheme coding rate instruction unit 106 generate a packet loss when the received packet number of the received Ack is not updated from the received number of the previously received Ack. Judge that
- the transmission parameter setting unit 107 includes a transmission power setting unit 108 and a modulation scheme coding rate setting unit 109.
- the transmission power setting unit 108 receives the transmission power setting value from the transmission power instruction unit 105 and sets the value.
- the modulation scheme coding rate setting unit 109 receives the modulation scheme and coding rate setting values from the modulation scheme coding rate instruction unit 106 and sets the values.
- the transmission control unit 110 reads the transmission data buffered in the transmission buffer 101, and transmits the transmission data according to the settings of the transmission power setting unit 108 and the modulation scheme coding rate setting unit 109.
- data can be transmitted adaptively based on the ratio of the amount of transmitted packet data each time transmission is performed for the transmission window size, with a strong transmission power and a robust modulation scheme and coding rate. .
- the loss of the packet data at the early stage of transfer can be suppressed.
- the strong transmission power and the modulation scheme and the coding rate that are strong in error tolerance are strengthened at the same time, but at least one may be strengthened.
- the loss of packet data causes the receiving side to shorten the period in which the duplicate Ack continues to be returned every time the packet data is received, the load on the data transmitting apparatus is reduced and the increase in power of the receiving terminal is suppressed. be able to.
- the receiving terminal returns Ack every time the first data is received. Furthermore, when the data reception progresses and gets on the trajectory, the receiving terminal returns Ack once for a plurality of data reception times. In FIG. 2A, Ack is returned once for two data receptions.
- the receiving terminal returns Ack every time data is received. For this reason, in the method according to the prior art, the influence of the packet loss occurrence becomes earlier as the transfer is performed earlier, and the power increases as the number of Ack transmissions increases. Thus, in the conventional example, the number of times of Ack transmission on the terminal side increases when packet loss occurs, increasing the load on the transmitting terminal and increasing the power consumption of the receiving terminal.
- every time the transmission window size is transferred based on the transmission amount with respect to the transmission window size (1) the transmission power at the start of the transfer is increased, and thereafter the transmission power is decreased. .
- (2) transmission is performed with strong error correction at the start of transfer and then weakening error correction.
- the transmission parameter instruction unit 104 instructs parameter setting values for realizing the above (1) and (2), and the transmission parameter setting unit 107 sets the parameters instructed by the transmission parameter instruction unit 104.
- the instruction / setting of the parameter may be either one or both of the transmission power selection setting (1) and the modulation scheme / coding rate selection setting (2).
- FIG. 10 is a diagram illustrating a setting table included in the transmission parameter instruction unit 104.
- the transmission parameter instruction unit 104 has a setting table 140, and refers to the setting table 140 to select / instruct transmission power and modulation scheme / coding rate according to the transmission amount.
- the setting table 140 stores the transmission power corresponding to the transmission amount and the modulation method / coding rate.
- the transmission power MAX 100%
- the modulation scheme / coding rate BPSK / 1/2.
- the transmission power is 90%
- the modulation method / coding rate is 16-QAM / 1/2.
- the transmission power is 80% and the modulation method / coding rate is 64-QAM / 1/2.
- the setting table 140 for example, when the transmission amount is 75-100%, the transmission power is 60% and the modulation method / coding rate is 64-QAM / 3/4. There are various variations in how to set the setting table 140. Details will be described later in a third embodiment.
- FIG. 11 is a diagram for explaining the relationship between the transmission rate, the modulation method, and the coding rate.
- the coding rate and the transmission rate [Mbps] are different for each modulation method.
- a modulation scheme having a smaller coding rate or a lower transmission rate [Mbps] has higher reliability.
- the modulation scheme BPSK has a coding rate of 1/2 and a transmission rate of 6 M [Mbps], and has the highest reliability with respect to packet data transmission.
- 64-QAM which has the highest coding rate and transmission rate [Mbps] has a high coding rate and transmission rate [Mbps]. Reliability is reduced.
- each time the transmission window size is transferred (1) the transmission power at the start of transfer is increased, and thereafter the transmission power is decreased based on the transmission amount with respect to the transmission window size. To send. Alternatively, (2) transmission is performed with strong error correction at the start of transfer and then weakening error correction.
- FIG. 12 is a control sequence diagram illustrating TCP transmission / reception control according to the present embodiment.
- FIG. 11 shows an example in which the transmission power at the start of transfer is increased (MAX 100%) each time the transmission window size is transferred based on the transmission amount with respect to the transmission window size.
- the transmission control for increasing the reliability may be a combination of a highly reliable modulation scheme, or may be only the modulation scheme instead of the transmission power.
- the transmission power at the start of the transfer is increased (MAX 100%). If the number of data transmissions exceeds 25, for example, the transmission power is set to 90%. When the number of data transmissions exceeds 50, for example, the transmission power is set to 80%, and when the number of data transmissions exceeds 75, for example, the transmission power is set to 60%.
- the data transmission control of this embodiment can suppress the occurrence of packet loss at the beginning of transfer as shown in part a of FIG.
- the Ack transmission frequency is as usual.
- the transmission power is set to 60% on the transmission side to promote packet loss occurrence, and packet loss occurs when the number of data transmissions is 75 times. And On the receiving side, after this packet loss occurs, Ack is returned every time data is received. For this reason, the Ack transmission frequency increases. However, even if a packet loss occurs, it is the second half of the data transfer for the transmission window size, and the packet loss occurrence at an early stage of the transfer can be suppressed. Therefore, in the present embodiment, the number of Ack transmissions on the receiving terminal side can be suppressed, and the power on the receiving side can be reduced.
- information that a packet loss has occurred when the transmission power is set to 60% on the transmission side can be used for subsequent data transmission control.
- data transmission control that suppresses packet loss such as transmission power of 60% or more, or data transmission with a modulation scheme and coding rate that is strong in error tolerance, etc. It can be performed.
- packet data at the initial stage of transfer is transmitted at the initial stage of transfer by transmitting data with a strong transmission power and a modulation scheme and coding rate that are resistant to error resistance. Loss can be suppressed.
- the data transmission apparatus 100 includes the transmission amount analysis unit 103 that analyzes the transmitted packet data amount with respect to the transmission window size set in the transmission window size setting unit 102.
- the data transmission device 100 includes a transmission parameter instruction unit 104 that instructs the transmission parameter setting unit 107 of different transmission power, modulation scheme, and coding rate according to the ratio of the amount of transmitted packet data to the transmission window size.
- the data transmission device 100 includes a transmission parameter setting unit 107 that sets a parameter instructed by the transmission parameter instruction unit 104.
- the data transmission device 100 includes a transmission control unit 110 that reads transmission data from the transmission buffer 101 and transmits the transmission data based on the setting of the transmission parameter setting unit 107.
- the transmission parameter instruction unit 304 instructs the transmission parameter setting unit 107 of different transmission power, modulation scheme, and coding rate according to the ratio of the amount of transmitted packet data to the transmission window size.
- the transmission parameter setting unit 107 sets the instructed parameter, and the transmission control unit 110 transmits transmission data based on the setting.
- the data transmitting apparatus 100 can suppress the loss of packet data at the initial stage of transfer when transferring the transmission window size. As a result, an increase in the number of duplicate Ack transmissions on the receiving side can be suppressed, and the load on the data transmitting apparatus can be reduced and the power consumption of the receiving terminal can be reduced.
- indication part 104 in this Embodiment was set as the structure provided with the transmission power instruction
- the transmission parameter setting unit 107 may include only one of the transmission power setting unit 108 and the modulation scheme coding rate setting unit 109.
- the value to be initially set is not limited to this, and may be arbitrarily determined according to the state and configuration of the apparatus.
- TCP has been mainly described as a protocol with flow control
- the protocol used in the present invention is not limited to TCP.
- the present invention may use other protocols as long as it has a flow control function.
- the flow control is realized in the application layer, and transmission control similar to TCP is performed by the flow control, thereby reducing power consumption. May be.
- FIG. 13 is a block diagram showing the configuration of the data transmission apparatus according to Embodiment 2 of the present invention. The same components as those in FIG.
- the data transmission device 200 includes a transmission buffer 101, a transmission window size setting unit 102, an Ack reception unit 112, a transmission amount analysis unit 103, a transmission parameter setting unit 107, a transmission power setting unit 108, a modulation scheme code.
- the transmission buffer 101 buffers transmission data.
- the transmission window size setting unit 102 sets a transmission window size determined by TCP flow control.
- the transmission amount analysis unit 103 calculates the ratio of the transmitted data amount to the transmission window size from the transmission data amount read from the transmission buffer 101 and the transmission window size set by the transmission window size setting unit 102.
- the transmission parameter setting unit 107 sets transmission parameters when transmitting transmission data according to the result of the transmission amount analysis unit.
- the transmission control unit 110 reads the transmission data buffered in the transmission buffer 101, and transmits the transmission data according to the settings of the transmission power setting unit 108 and the modulation scheme coding rate setting unit 109.
- the data transmission unit 120 transmits the transmission data received from the transmission control unit 110.
- every time transmission is performed for the transmission window size adaptively based on the ratio of the amount of transmitted packet data, modulation with strong transmission power and error resistance is adaptive.
- Data can be transmitted with a method and a coding rate.
- this Embodiment can suppress the loss of the packet data in the transfer stage.
- data is transmitted with a modulation scheme and coding rate that are strong in transmission power and error tolerance, and packet data loss at the initial stage of transfer can be suppressed.
- FIG. 14 is a block diagram showing a configuration of a data transmission apparatus according to Embodiment 3 of the present invention.
- the data transmission apparatus 300 is different from the transmission parameter instruction unit 104 in FIG. 5 in the configuration of the transmission parameter instruction unit 304.
- the transmission parameter instruction unit 304 includes a transmission power instruction unit 305, a modulation scheme coding rate instruction unit 306, and a transmission parameter control setting unit 310.
- the transmission power instruction unit 305 receives information on the ratio of the transmitted data amount from the transmission amount analysis unit 103.
- the transmission power instruction unit 305 instructs the transmission power setting unit 108 on the transmission power setting value based on the setting such as update by the transmission parameter control setting unit 310 and the ratio of the received transmitted data amount.
- the modulation scheme coding rate instruction unit 306 receives information on the ratio of the transmitted data amount from the transmission amount analysis unit 103.
- the modulation scheme coding rate instruction unit 306 sets the modulation scheme and the coding rate based on the setting such as update by the transmission parameter control setting unit 310 and the ratio of the received transmitted data amount. To instruct.
- the transmission parameter control setting unit 310 sets the update order of the transmission power, modulation scheme, and coding rate setting value. Specifically, the transmission parameter control setting unit 310 determines whether to update the transmission power, the modulation scheme, and the coding rate at the same time or alternately, or update one of them with priority. Set.
- Transmission parameter control setting section 310 sets the update order of transmission power, modulation scheme, and coding rate setting values. Specifically, the transmission parameter control setting unit 310 determines whether to update the transmission power, the modulation scheme, and the coding rate at the same time or alternately, or update one of them with priority. Set.
- the transmission parameter control setting unit 310 sets the modulation system and coding rate change priority in order to prioritize the power on the transmission side.
- the change priority is to change only the setting of the modulation scheme and the coding rate first without changing the transmission power.
- the transmission parameter control setting unit 310 gives priority to speeding up the communication rate when the transmission side is a stationary device that does not care about power relatively. For this reason, in the stationary device, the transmission parameter control setting unit 310 sets the transmission power change priority and changes only the transmission power first without changing the modulation scheme.
- changing the modulation method and coding rate may reduce the transmission rate and delay transfer, so the transmission power is controlled first.
- the transmission parameter control setting unit 310 is set to change the transmission power, the modulation method, and the coding rate at the same time. However, the setting value need not be changed at the same time as the transmission power, the modulation method, and the coding rate. Absent.
- the setting of the transmission parameter control setting unit 310 may be performed by alternately changing the transmission power, the modulation method, and the coding rate, or may continue to change any one first by giving priority. .
- transmission parameter control setting section 310 sets the modulation scheme and coding rate change priority, and changes only the modulation scheme and coding rate setting first without changing the transmission power.
- the transmission parameter control setting unit 310 sets the transmission power change priority and does not change the modulation method. Change only the transmission power first.
- the occurrence of packet data loss enables the receiving side to shorten the period in which the duplicate Ack continues to be returned every time packet data is received, thereby suppressing an increase in power.
- each functional block of the data transmission device 100 may be realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. Specifically, a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor capable of reconfiguring connection and setting of circuit cells inside the LSI may be used.
- a programmable FPGA Field Programmable Gate Array
- a reconfigurable processor capable of reconfiguring connection and setting of circuit cells inside the LSI may be used.
- the names of the data transmission device, the data transmission system, and the data transmission method are used for convenience of explanation.
- the name of the device is the transmission device, the communication system, and the name of the method is transmission. It may be a control method or the like.
- each unit constituting the data transmission device may be any type of communication network, the number thereof, a connection method, and the like.
- the data transmission method described above can also be realized by a program for causing this data transmission method to function.
- This program is stored in a computer-readable recording medium.
- the data transmitting apparatus and data transmitting method according to the present invention have an effect of suppressing the number of times of Ack transmission on the receiving side, and are useful for devices having a server function having a wireless LAN function.
- the present embodiment can also be applied to devices that employ a communication method compatible with TCP other than wireless LAN.
Abstract
Description
図3及び図4は、本発明の実施の形態1に係るデータ送信装置が適用されるシステム構成の一例を示す図である。
図7は、データ送信装置100の送信制御を示すフローチャートである。
図2(a)に示すように、従来のTCPプロトコル動作において、受信端末は、最初のデータ受信に対して毎回Ackを返す。さらに、受信端末は、データ受信が進み軌道に乗るとデータ受信の複数回に対して1回Ackを返すようになる。図2(a)では、データ受信2回に対して1回Ackを返している。
図13は、本発明の実施の形態2に係るデータ送信装置の構成を示すブロック図である。図5と同一構成部分には同一符号を付して重複箇所の説明を省略する。
図14は、本発明の実施の形態3に係るデータ送信装置の構成を示すブロック図である。
送信パラメータ指示部304は、送信パワー指示部305、変調方式符号化率指示部306、及び送信パラメータ制御設定部310を備える。
送信パラメータ制御設定部310は、送信パワーと変調方式、符号化率の設定値の更新順序を設定する。具体的には、送信パラメータ制御設定部310は、更新の際に、送信パワーと変調方式、符号化率を同時に更新するか、交互に更新するか、どちらか一方を優先して更新するかを設定する。
101 送信バッファ
102 送信ウインドウサイズ設定部
103 送信量解析部
104,304 送信パラメータ指示部
105,305 送信パワー指示部
106,306 変調方式符号化率指示部
107 送信パラメータ設定部
108 送信パワー設定部
109 変調方式符号化率設定部
200 データ送信システム
310 送信パラメータ制御設定部
Claims (8)
- 送信データをバッファリングする送信バッファと、
前記送信バッファに対する送信ウインドウサイズを設定する送信ウインドウサイズ設定部と、
前記送信ウインドウサイズ設定部に設定された送信ウインドウサイズに対する送信済みパケットデータ量を解析する送信量解析部と、
前記送信量解析部の結果に応じて、送信データを送出する際の送信パラメータを設定する送信パラメータ設定部と、
前記送信バッファから送信データを読み出し、前記送信パラメータに基づいて送信データを送出する送信制御部と、
前記送信制御部から受信した送信データを送信するデータ送信部と、
を備えるデータ送信装置。 - 前記送信パラメータ設定部は、前記送信量解析部の送信済みパケットデータ量に応じて、前記送信制御部において送信データを送出する際の送信パワー値、変調方式の種類、または、符号化率の値の少なくとも1つを前記送信パラメータとして設定する、請求項1記載のデータ送信装置。
- 前記送信パラメータ設定部は、前記送信データの応答であるAckを受信し、前記Ackのパケット番号の内容に応じて、パラメータ設定値を変更する、請求項1に記載のデータ送信装置。
- 前記送信パラメータ設定部は、指示したパラメータ設定値で送信した結果、パケットデータの損失が発生した場合、前記パラメータの少なくとも1つをパケットロスに強い設定値に変更する、請求項1記載のデータ送信装置。
- 前記送信パラメータ設定部は、転送の初期段階には、前記パラメータの少なくとも1つをパケットロスに強い前記設定値を設定する、請求項1記載のデータ送信装置。
- 送信データを送出するデータ送信装置のデータ送信方法であって、
送信データをバッファリングするステップと、
前記送信バッファに対する送信ウインドウサイズを設定するステップと、
前記設定された送信ウインドウサイズに対する送信済みパケットデータ量を解析するステップと、
前記解析結果に応じて、送信データを送出する際の送信パラメータを設定するステップと、
前記送信バッファから送信データを読み出し、前記送信パラメータに基づいて送信データを送出するステップと、
前記送信制御部から受信した送信データを送信するステップと、
有するデータ送信方法。 - 前記送信パラメータ指示ステップでは、パケットデータの損失が発生した場合には送信パワー、及び/又は誤り耐性が強くなるように前記設定値を変更する、請求項6記載のデータ送信方法。
- 前記送信パラメータ指示ステップでは、転送の初期段階には、強い送信パワー、及び/又は誤り耐性に強い変調方式符号化率の前記設定値を指示する、請求項6記載のデータ送信方法。
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