CN107508763B - Sending time control method, system and transmission equipment - Google Patents
Sending time control method, system and transmission equipment Download PDFInfo
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- CN107508763B CN107508763B CN201610415779.2A CN201610415779A CN107508763B CN 107508763 B CN107508763 B CN 107508763B CN 201610415779 A CN201610415779 A CN 201610415779A CN 107508763 B CN107508763 B CN 107508763B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001360 synchronised effect Effects 0.000 claims description 11
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000004891 communication Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
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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
- H04L47/28—Flow control; Congestion control in relation to timing considerations
- H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
Abstract
The invention provides a sending time control method, a system and transmission equipment, wherein the sending time control method comprises the following steps: acquiring the time when the first receiving point receives the first data packet as a first time; acquiring the time when the second receiving point receives the first data packet as a second time; setting the difference value between the second moment and the first moment as a delay threshold value; when the time difference value of the second data packet passing through the second receiving point and the first receiving point is smaller than or equal to the delay threshold value, the second data packet is sent to the first sending point to be sent after the delay of the second data packet meets the delay threshold value; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, updating the delay threshold value to be the current time difference value, and directly sending the second data packet to the first sending point for sending. The invention can control any transmission system to send data at a basically uniform speed, avoids the problem of performance reduction of the transmission system caused by jitter to the maximum extent, does not need to increase more hardware resources and has low cost.
Description
Technical Field
The present invention belongs to the field of communication technology, and relates to a method for controlling data or information transmission, in particular to a method, a system and a transmission device for controlling transmission time.
Background
RTT (round Trip time) represents a time required for one round Trip from the sending end to the receiving end, and the TCP samples the RTT during data transmission, that is, measures a time difference between a sent data packet and its ACK, and updates the RTT value according to the measured value. TCP updates an RTO (Retransmission Time Out) value according to the obtained RTT value. And the sending end times each sent data packet, if the corresponding ACK of the sent data packet is not received within the RTO time, the task data packet is lost, and the data is retransmitted. The RTO value is typically larger than the sampled RTT value.
In the practical application process, factors such as unstable data packet rate, transmission network delay and unstable processing equipment capability sent by a data source sending end can cause the phenomenon of unstable data packet transmission rate, so that the time intervals of data packets arriving at a receiving end are different, and the problem of delay jitter occurs.
In order to solve the problem, the prior art usually transmits data at a certain fixed or calculated rate through a buffer, so as to achieve the effect of equalizing the transmission rate, but in this process, the adjustment rate with intervention may make statistics of transmission delay more difficult for both the transmitting and receiving parties in some cases, resulting in the degradation of system performance.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a transmission time control method, system and transmission device, which are used to solve the problem of performance degradation of a protocol stack caused by jitter when data passes through a transmission system in the prior art.
To achieve the above and other related objects, the present invention provides a transmission time control method, including: acquiring the time when the first receiving point receives the first data packet as a first time; acquiring the time when the second receiving point receives the first data packet as a second time; the first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path; setting the difference value between the second moment and the first moment as a delay threshold value; when the time difference value of a second data packet passing through the second receiving point and the first receiving point is smaller than or equal to the delay threshold value, the second data packet is sent to a first sending point to be sent after the delay of the second data packet meets the delay threshold value; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, updating the delay threshold value to be the current time difference value, and directly sending the second data packet to the first sending point for sending.
In an embodiment of the present invention, the delay threshold further includes a transmission time adjustment value, that is, the delay threshold is a sum of the time difference and the transmission time adjustment value.
In an embodiment of the present invention, the first receiving point and the second receiving point are not synchronized.
In an embodiment of the invention, the transmission path includes a wired transmission line or/and a wireless network.
The present invention also provides a transmission time control system, including: the first acquisition module acquires the time when the first receiving point receives the first data packet as a first time; the second acquisition module is used for acquiring the time when the second receiving point receives the first data packet as a second time; the first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path; the control module is respectively connected with the first acquisition module and the second acquisition module, and the difference value between the second moment and the first moment is set as a delay threshold value; when the time difference value of a second data packet passing through the second receiving point and the first receiving point is smaller than or equal to the delay threshold value, the control module sends the second data packet to a first sending point to be sent after the delay of the second data packet meets the delay threshold value; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, the control module updates the delay threshold value to be the current time difference value and directly sends the second data packet to the first sending point for sending.
In an embodiment of the present invention, the delay threshold further includes a transmission time adjustment value, that is, the delay threshold is a sum of the time difference and the transmission time adjustment value.
In an embodiment of the present invention, the first receiving point and the second receiving point are not synchronized.
In an embodiment of the invention, the transmission path includes a wired transmission line or/and a wireless network.
The present invention also provides a transmission apparatus having the transmission time control system of any one of claims 5 to 8 operated therein.
In an embodiment of the present invention, the transmission device further includes the second receiving point and the first sending point.
As described above, the sending time control method, system and transmission device of the present invention have the following beneficial effects:
the invention can control any transmission system to send data at a basically uniform speed, avoids the problem of performance reduction of the transmission system caused by jitter to the maximum extent, does not need to increase more hardware resources and has low cost.
Drawings
Fig. 1 is a schematic diagram of a conventional data transmission scenario.
Fig. 2 is a schematic flow chart illustrating an implementation of the method for controlling transmission time according to the embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating an implementation structure of a transmission time control system according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an implementation of the transmission device according to the embodiment of the present invention.
Description of the element reference numerals
110 first receiving point
120 transmission path
130 second receiving point
140 first transmission point
300 transmission time control system
310 first acquisition module
320 second acquisition module
330 control module
400 transmission device
410 second receiving point
420 first transmission point
430 first acquisition module
440 second acquisition module
450 control module
S201 to S206
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, after passing through a first receiving point 110, a data packet passes through a transmission path 120 with unknown distance length to a second receiving point 130, and then is transmitted from a first transmitting point 140. The transmission path 120 includes a wired transmission line and/or a wireless network, that is, the transmission path 120 may be a wired or wireless transmission line, a short-range communication path, a long-range communication path, a communication path conforming to one communication protocol, or a mixed communication path conforming to a plurality of transmission protocols.
Taking the data packet transmission scenario shown in fig. 1 as an example, the present embodiment provides a transmission time control method, and as shown in fig. 2, the transmission time control method includes:
s201, a time when the first receiving point receives the first data packet is obtained as a first time.
S202, acquiring the time when the second receiving point receives the first data packet as a second time; the first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path. The clocks of the first receiving point and the second receiving point may not be synchronized or may be synchronized. In a general technical solution, the compared time is generally based on the same clock as a timing standard, but in the embodiment of the present invention, the clocks of the first receiving point and the second receiving point may not be synchronized, so the application range of the present invention is also wider, and the first receiving point and the second receiving point may be respectively located in any two communication devices, or may be located in the same communication device.
And S203, setting the difference value between the second moment and the first moment as a delay threshold value.
S204, judging whether the time difference value of a second data packet passing through the second receiving point and the first receiving point is less than or equal to the delay threshold value; if not, go to step S205; if yes, go to step S206.
And S205, updating the delay threshold value to be the difference value of the current time.
S206, when the delay of the second data packet meets the delay threshold, the second data packet is sent to a first sending point to be sent. That is, when the time difference value of the second data packet passing through the second receiving point and the first receiving point is less than or equal to the delay threshold, the second data packet is sent to the first sending point to be sent after the delay of the second data packet meets the delay threshold; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, updating the delay threshold value to be the current time difference value, wherein the delay of the second data packet at this time meets the delay threshold value, so that the second data packet is directly sent to the first sending point for sending.
Further, the delay threshold further includes a transmission time adjustment value, that is, the delay threshold is the sum of the time difference and the transmission time adjustment value.
For example: assume that the first time T11 of the first packet is 7s, and the second time T12 is 4 s; then the delay threshold T' is 4-7-3 s.
When the first time T21 of the second packet is 10s and the second time T22 is 6s, the difference value of the current time is 6-10-4 s, and is smaller than the delay threshold T' -3s, the second packet needs to wait for 1s before being transmitted.
When the first time T31 of the third packet is 12s and the second time T32 is 10s, the current time difference is 10-12-2 s, and is greater than the delay threshold T ' — 3s, the delay threshold T ' is updated to-2 s, that is, T ' — 2s, and the current time difference of the third packet already satisfies the updated delay threshold, so the third packet needs to be sent immediately.
Further, assuming that the transmission time adjustment value is 1s, and then the delay threshold T' ═ 3+1 ═ -2s, then the second packet should wait for 2s before being transmitted; and the time difference of the third data packet is equal to-2 s, the third data packet needs to be sent immediately.
By the transmission control method, the transmission system can basically keep transmitting data at a constant speed, and the problem of performance reduction caused by jitter is avoided to the maximum extent.
The protection scope of the transmission time control method according to the present invention is not limited to the execution sequence of the steps listed in this embodiment, and all the schemes of adding, subtracting, and replacing steps in the prior art according to the principle of the present invention are included in the protection scope of the present invention.
The present invention also provides a sending time control system, which can implement the sending time control method of the present invention, but the implementation device of the sending time control method of the present invention includes, but is not limited to, the structure of the sending time control system described in this embodiment, and all structural modifications and substitutions of the prior art made according to the principle of the present invention are included in the protection scope of the present invention.
Referring to fig. 3, the transmission time control system 300 includes: a first obtaining module 310, a second obtaining module 320, and a control module 330.
The first obtaining module 310 obtains a time when the first receiving point 110 receives the first data packet as a first time.
The second obtaining module 320 obtains a time when the second receiving point 130 receives the first data packet as a second time. The first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path. The first sink and the second sink clocks are not synchronized. In a general technical solution, the compared time is generally based on the same clock as a timing standard, but in the embodiment of the present invention, the clocks of the first receiving point and the second receiving point may not be synchronized, so the application range of the present invention is also wider, and the first receiving point and the second receiving point may be respectively located in any two communication devices, or may be located in the same communication device.
The control module 330 is connected to the first obtaining module 310 and the second obtaining module 320, respectively, and a difference between the second time and the first time is set as a delay threshold; when the time difference value of the second data packet passing through the second receiving point and the first receiving point is less than or equal to the delay threshold, the control module 330 sends the second data packet to the first sending point for sending after the delay of the second data packet meets the delay threshold; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, the control module updates the delay threshold value to be the current time difference value and directly sends the second data packet to the first sending point for sending.
Further, the delay threshold further includes a transmission time adjustment value, that is, the delay threshold is the sum of the time difference and the transmission time adjustment value.
For example: assuming that the first time T11 is 10s and the second time T12 is 14s of the first packet; then the delay threshold T' is 14-10-4 s.
When the first time T21 of the second packet is 13s and the second time T22 is 16s, the difference between the current times is 16-13-3 s, and is less than the delay threshold T' 4s, the second packet needs to wait for 1s before being transmitted.
When the first time T31 of the third packet is 16s, and the second time T32 is 22s, the current time difference is 22-16-6 s, and is greater than the delay threshold T ' ═ 4s, the delay threshold T ' is updated to 6s, that is, T ' ═ 6s, and the current time difference of the third packet already satisfies the updated delay threshold, so the third packet needs to be sent immediately.
Further, assuming that the transmission time adjustment value is 1s, and then the delay threshold T' is 3+1 is 4s, the second packet should wait for 1s before being transmitted; and the time difference of the third data packet is equal to 6s, the third data packet needs to be sent immediately.
The sending control system can control any transmission system to send data at a basically constant speed, avoids the problem of performance reduction of the transmission system caused by jitter to the maximum extent, does not need to increase more hardware resources, and has low cost.
Referring to fig. 4, an embodiment of the present invention further provides a transmission apparatus, where the transmission apparatus 400 includes: a second receiving point 410, a first sending point 420, a first obtaining module 430, a second obtaining module 440, and a control module 450.
The first sending point 420 is communicatively connected to the second receiving point 410, and is configured to send a data packet to the second receiving point; the second receiving point 410 and the first transmitting point 420 are located in the same communication device; the first receiving point and the second receiving point 410 are located in different communication devices or in the same communication device.
The first obtaining module 430 obtains a time when the first receiving point receives the first data packet as a first time.
The second obtaining module 440 obtains a time when the second receiving point 410 receives the first data packet as a second time. The first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path. The first sink and the second sink clocks are not synchronized. In a general technical solution, the compared time is generally based on the same clock as a timing standard, but in the embodiment of the present invention, the clocks of the first receiving point and the second receiving point may not be synchronized, so the application range of the present invention is also wider, and the first receiving point and the second receiving point may be respectively located in any two communication devices, or may be located in the same communication device.
The control module 450 is connected to the first obtaining module 430 and the second obtaining module 440, respectively, and the difference between the second time and the first time is set as a delay threshold; when the time difference value of the second data packet passing through the second receiving point and the first receiving point is less than or equal to the delay threshold, the control module 450 sends the second data packet to the first sending point 420 for sending after the delay of the second data packet meets the delay threshold; when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold, the control module 450 updates the delay threshold to be the current time difference value, and directly sends the second data packet to the first sending point 420 for sending.
Further, the delay threshold further includes a transmission time adjustment value, that is, the delay threshold is the sum of the time difference and the transmission time adjustment value.
For example: assuming that the first time T11 is 10s and the second time T12 is 14s of the first packet; then the delay threshold T' is 14-10-4 s.
When the first time T21 of the second packet is 13s and the second time T22 is 16s, the difference between the current times is 16-13-3 s, and is less than the delay threshold T' 4s, the second packet needs to wait for 1s before being transmitted.
When the first time T31 of the third packet is 16s, and the second time T32 is 22s, the current time difference is 22-16-6 s, and is greater than the delay threshold T ' ═ 4s, the delay threshold T ' is updated to 6s, that is, T ' ═ 6s, and the current time difference of the third packet already satisfies the updated delay threshold, so the third packet needs to be sent immediately.
Further, assuming that the transmission time adjustment value is 1s, and then the delay threshold T' is 3+1 is 4s, the second packet should wait for 1s before being transmitted; and the time difference of the third data packet is equal to 6s, the third data packet needs to be sent immediately.
The transmission equipment has the transmission control function, can automatically control the transmission time of the data packet, transmits data at a basically constant speed, and avoids the problem of performance reduction of the transmission equipment caused by jitter to the maximum extent.
In addition, the invention can be applied to various systems with larger transmission delay jitter, such as EPON over Coax, TD-LTE, TD-SCDMA and the like.
Since the prior art usually sends data through a buffer at a certain fixed or calculated rate, in order to achieve the effect of equalizing the sending rate, in this process, the adjustment rate with intervention may make the statistics of transmission delay more difficult for both the sending and receiving parties in some cases, resulting in the performance degradation of the system. The invention can only add a fixed delay to the system, which means that the effect on the transmission model is completely linear. Taking the TCP protocol as an example, after the RTT increases for a fixed time, as long as the TCP windows of the transmitting and receiving parties are large enough, the influence of the transmission system on the TCP transmission can be ignored.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A transmission time control method, characterized by comprising:
acquiring the time when the first receiving point receives the first data packet as a first time;
acquiring the time when the second receiving point receives the first data packet as a second time; the first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path;
setting the difference value between the second moment and the first moment as a delay threshold value;
when the time difference value of a second data packet passing through the second receiving point and the first receiving point is smaller than or equal to the delay threshold value, the second data packet is sent to a first sending point to be sent after the delay of the second data packet meets the delay threshold value; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, updating the delay threshold value to be the current time difference value, and directly sending the second data packet to the first sending point for sending.
2. The transmission time control method according to claim 1, characterized in that: the delay threshold further includes a sending time adjustment value, that is, the delay threshold is the sum of the time difference and the sending time adjustment value.
3. The transmission time control method according to claim 1, characterized in that: the first sink and the second sink clocks are not synchronized.
4. The transmission time control method according to claim 1, characterized in that: the transmission path includes a wired transmission line or/and a wireless network.
5. A transmission time control system, characterized by comprising:
the first acquisition module acquires the time when the first receiving point receives the first data packet as a first time;
the second acquisition module is used for acquiring the time when the second receiving point receives the first data packet as a second time; the first data packet starts from the first receiving point and then reaches the second receiving point through a transmission path;
the control module is respectively connected with the first acquisition module and the second acquisition module, and the difference value between the second moment and the first moment is set as a delay threshold value; when the time difference value of a second data packet passing through the second receiving point and the first receiving point is smaller than or equal to the delay threshold value, the control module sends the second data packet to a first sending point to be sent after the delay of the second data packet meets the delay threshold value; and when the time difference value of the second data packet passing through the second receiving point and the first receiving point is greater than the delay threshold value, the control module updates the delay threshold value to be the current time difference value and directly sends the second data packet to the first sending point for sending.
6. The transmission time control system according to claim 5, characterized in that: the delay threshold further includes a sending time adjustment value, that is, the delay threshold is the sum of the time difference and the sending time adjustment value.
7. The transmission time control system according to claim 5, characterized in that: the first sink and the second sink clocks are not synchronized.
8. The transmission time control system according to claim 5, characterized in that: the transmission path includes a wired transmission line or/and a wireless network.
9. A transmission apparatus characterized in that it operates with a transmission time control system according to any one of claims 5 to 8.
10. The transmission apparatus according to claim 9, characterized in that: the transmission device further comprises the second receiving point and the first transmitting point.
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