CN112600739B - Vehicle-mounted Ethernet AVB jitter optimization method, system and storage medium - Google Patents
Vehicle-mounted Ethernet AVB jitter optimization method, system and storage medium Download PDFInfo
- Publication number
- CN112600739B CN112600739B CN202011626359.1A CN202011626359A CN112600739B CN 112600739 B CN112600739 B CN 112600739B CN 202011626359 A CN202011626359 A CN 202011626359A CN 112600739 B CN112600739 B CN 112600739B
- Authority
- CN
- China
- Prior art keywords
- avb
- jitter
- delay
- bridge
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005457 optimization Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000007499 fusion processing Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003999 initiator Substances 0.000 description 4
- 235000008694 Humulus lupulus Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
- H04L43/087—Jitter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/462—LAN interconnection over a bridge based backbone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Computing Systems (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Small-Scale Networks (AREA)
Abstract
The invention discloses a vehicle-mounted Ethernet AVB jitter optimization method, a system and a storage medium, and belongs to the technical field of information. Aiming at the problem of network jitter of a vehicle-mounted Ethernet AVB technology in scenes such as automatic driving related sensor fusion processing and the like in the prior art, the invention provides a vehicle-mounted Ethernet AVB jitter optimization method, which comprises the following steps: establishing constraint conditions, namely admission control; establishing time synchronization; calculating network delay of each hop; establishing a delay compensation mechanism model; end-to-end jitter upper and lower bounds are calculated. In addition, a vehicle-mounted Ethernet AVB jitter optimization system and a storage medium are also provided. The method, the system and the storage medium adopt the Ethernet, thereby solving the problem of poor interoperability of the traditional vehicle-mounted bus; the AVB protocol is adopted, so that the delay of vehicle-mounted audio and video transmission is met; the jitter characteristic of the AVB protocol is obviously improved by adopting the technologies of a per-hop delay compensation mechanism, priority dynamic allocation and the like.
Description
Technical Field
The invention relates to the technical field of information, in particular to a vehicle-mounted Ethernet AVB jitter optimization method, a system and a storage medium.
Background
According to the definition of the national standard of the people's republic of China, namely, the automatic classification of automobile driving (promissory draft), the automatic driving is classified into 6 grades from 0 grade to 5 grade. With the improvement of the automatic driving level, more sensors, such as a camera, a laser radar, a millimeter wave radar and the like, need to be deployed. The traditional vehicle-mounted network mainly comprises CAN, LIN, Flexray and other buses, and has the common defect of insufficient bandwidth; secondly, data such as a camera and a laser radar adopting the interface can be transmitted only by compression processing, so that the problems of low processing precision and the like are easily caused; ethernet has the characteristics of general use, large bandwidth, and the like, is gradually used in the field of vehicle-mounted networks, such as audio and video transmission related to a rear seat entertainment system, and is already in batch use in a few vehicle models.
Avb (audio Video bridge), an audio Video bridge, is a data link layer network protocol for high-quality audio Video transmission based on IEEE 802.3 ethernet, and was defined by the IEEE 802.1 working group in 2005. The AVB Protocol includes three parts, namely IEEE 802.1AS, Precision Time synchronization Protocol (Precision Time Protocol); IEEE 802.1Qat, Stream Reservation Protocol (Stream Reservation Protocol); IEEE 802.1Qav, Queuing and Forwarding Protocol (Queuing and Forwarding Protocol). The working mechanism is that firstly the time synchronization of each device is completed, then the sending end initiates the bandwidth reservation request, the receiving end returns the prepared Ack, wherein the network bridge completes the bandwidth reservation by using SRP according to the requirement of the sending end, and finally the flow is sent to the receiving end according to the CBS algorithm specified in the FQTSS. According to the definition of IEEE 802.1AVB standard, within 7 hops, AVB can respectively provide two delay levels of 2ms and 10ms, wherein 2ms delay can meet the end-to-end delay requirements of most of sensors such as cameras, laser radars and the like related to automatic driving at present, but the sensors usually need fusion processing, and the network jitter directly influences the precision of the fusion processing of the sensors.
In the process of forwarding a data frame, an egress queue of a bridge generally adopts a FIFO (First Input First Output) or SP (Strict Priority) manner, which cannot guarantee the forwarding order of a specific data frame, and each hop causes accumulation of delay deviation, which is a main cause of network jitter. Although the AVB protocol uses credit-based shaping (CBS) to guarantee end-to-end delay, the egress queues of AVB bridges generally use the SP method, so that end-to-end jitter cannot be guaranteed, and thus, the AVB is not yet suitable for transmission of data such as cameras related to automatic driving. In addition, in 2012, the IEEE 802.1 has expanded the AVB to become a TSN working group, where 802.1Qbv specifies a time-series-based forwarding mechanism, which can satisfy very low jitter, even "0" jitter, but because of its complex configuration, no practical application has been developed yet.
Chinese patent application No. 201910273219.1, published 2020, 10/16 discloses a method for reducing the communication delay of an ethernet AVB, comprising: testing communication delay time existing in the transmission process of the Ethernet AVB network, wherein the communication delay time comprises at least two of a period for calling a virtual interface function to send a single CAN message by an internal decision layer of an intelligent domain controller, a CAN message sending period of an intelligent domain ECU and an external domain ECU, a CAN message updating period of the whole vehicle domain ECU and a period for sending the external domain ECU to the intelligent domain ECU; the processing cycle of the communication node in which the communication delay time exists is reduced. The core of the method is to reduce the whole delay by reducing the internal data processing period (namely the processing period of an application layer) of the node with communication delay. However, this method cannot fundamentally solve the AVB communication delay, and further cannot improve the jitter characteristics of the AVB.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problem of network jitter of a vehicle-mounted Ethernet AVB technology in scenes such as automatic driving related sensor fusion processing and the like in the prior art, the invention provides a vehicle-mounted Ethernet AVB jitter optimization method, a system and a storage medium, which can remarkably improve the jitter characteristic of the AVB on the premise of meeting end-to-end delay.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
A jitter optimization method for an AVB (Audio video bus) of a vehicle-mounted Ethernet comprises the following steps:
step 1, planning admission control in advance through an offline configuration tool, and establishing constraint conditions;
step 2, establishing time synchronization, and performing time synchronization calibration on the sending end, the AVB network bridge and the receiving end to ensure that the sending end, the AVB network bridge and the receiving end refer to the same reference time for stamping a time stamp;
step 3, calculating the network delay of each hop, and acquiring the actual forwarding delay of each AVB network bridge, wherein the delay of each network node is the difference value of the timestamp of the message at the entrance and the exit;
step 4, establishing a delay compensation mechanism model, and reducing the jitter value of a single network node to 0 at least;
and 5, obtaining an end-to-end jitter maximum value for verifying jitter optimization performance.
Further, the constraint conditions in step 1 are as follows: at the ingress of each AVB bridge, the sum of the rates of all traffic cannot exceed the egress rate of the AVB bridge, with the relationship:
wherein λiIs the rate of the ith stream and iota is the AVB bridge egress rate. This constraint is a precondition for the subsequent step, and if this constraint is not satisfied, the subsequent step cannot be performed.
Further, the specific process of step 2 includes: the sending end sends the time synchronization frame at time t1, the receiving end returns the data frame containing time t2, the sending end receives the frame at time t4, and the receiving end sends the data frame containing time t3 for link delay compensation, then the time deviation d between the sending end and the receiving end:
d＝((t2-t1)+(t4-t3))/2
and d is the original time deviation of the sending end and the receiving end, and the sending end or the receiving end adjusts the respective internal time according to d so that the internal time reference of each end device is the same.
Further, the step 3 comprises: network jitter arises because of delay variation, which for a network consisting of multiple network nodes, accumulates as end-to-end jitter. The actual forwarding delay of each network node is obtained by adding timestamps at the entrance and the exit of the AVB network bridge and calculating the difference value at the exit, and the accurate statistics of the actual forwarding delay of each network node is the key for guaranteeing the network jitter of the whole link.
Further, the step 4 comprises: before forwarding, the entry of the next AVB bridge compensates for the difference between the actual forwarding delay of the previous AVB bridge and the pre-programmed theoretical forwarding delay.
Further, the compensation mode is to add a compensator at the entrance of the AVB bridge.
Further, the step 4 further includes: for the data frame with the actual forwarding delay lower than the theoretical forwarding delay, the priority used in the last AVB bridge is properly reduced, and all the data frames can meet the theoretical forwarding delay planned in advance. By means of a hop-by-hop delay compensation mechanism (waiting or increasing the priority), it can be guaranteed that the jitter of all network nodes except the last network node is substantially 0.
Further, the step 5 comprises: and according to the exit queuing condition of the last AVB bridge and by combining the forwarding sequence of each flow, calculating the exit queuing time of each flow at the exit of the last AVB bridge, namely the maximum jitter value of the flow.
Further, in the step 5, the actual jitter value is
The actual jitter value is the maximum end-to-end jitter value; where N represents the number of data frames queued in the queue, L represents the frame length, and B represents the egress bandwidth.
An in-vehicle ethernet AVB jitter optimization system, the system comprising:
the constraint control module is used for establishing constraint conditions to realize admission control;
the time synchronization module is used for establishing time synchronization and carrying out time synchronization calibration on the sending end, the AVB network bridge and the receiving end;
the network delay module is used for calculating the network delay of each hop based on the result of the time synchronization module and obtaining the actual forwarding delay of each AVB network bridge;
the delay compensation module receives the result of the network delay module and establishes a delay compensation mechanism model for reducing the jitter value of a single network node;
and the calculation boundary module receives the result of the delay compensation module, calculates the maximum value of end-to-end jitter and verifies the jitter optimization performance.
A readable storage medium, storing a computer program comprising program instructions which, when executed by a processor, cause the processor to carry out the method as described above.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that: the method and the system adopt a per-hop delay compensation mechanism and a priority dynamic allocation technology, and the jitter characteristic of the AVB protocol is obviously improved; an AVB protocol is also adopted, so that the delay of vehicle-mounted audio and video transmission is met; by adopting the Ethernet, the problem of poor interoperability of the traditional vehicle-mounted bus is solved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of time synchronization as referenced in the present invention;
fig. 3 is an information flow diagram of an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
Example 1
The embodiment of the invention can be applied to data transmission of cameras, laser radars and the like related to an automatic driving system, and meets the jitter requirement of a multi-sensor fusion system on the data of the camera laser radars.
Based on the AVB jitter problem in the prior art, an embodiment of the present invention provides an AVB jitter optimization method for a vehicle-mounted ethernet network, and provides a transmission mechanism based on per-hop delay compensation, as shown in fig. 1, the method includes the following steps:
step 1, establishing a constraint condition, namely, planning the total rate of the flow which can be forwarded through the network in advance offline through a network controller, and the specific process is as follows:
at the Ingress (Ingress) of each AVB bridge, the sum of the rates of all traffic cannot exceed the Egress (Egress) rate of the AVB bridge. Assume that S is common1To SiNeed to be forwarded at a rate of lambda1To lambdaiIf the admission control condition is satisfied, the admission control condition is as follows:
wherein λiIs the rate of the ith stream (stream) and iota is the AVB bridge Egress (Egress) rate. Admission control generally requires offline configuration tool preplanning, which may be a network controller based on SDN architecture.
Step 2, establishing time synchronization, and carrying out time synchronization calibration on the sending end, the AVB network bridge and the receiving end, wherein the specific process is as follows:
based on the regulation of IEEE 802.1AS, the time synchronization calibration is carried out on the sending end, the AVB network bridge and the receiving end.
In one possible implementation, the time synchronization process is as shown in fig. 2, the sender (initiator) sends a time synchronization frame at time t1, the receiver (responder) returns a data frame containing time t2, the sender (initiator) receives the data frame at time t4, and the receiver (responder) sends a data frame containing time t3 for link delay compensation. And finally, calculating the time deviation d between the sender (initiator) and the receiver (responder):
d＝((t2-t1)+(t4-t3))/2；
d is the original time offset between the sender (initiator) and the receiver (responder), and the sender or the receiver adjusts the internal time of the device to be the same according to d. Through the time synchronization process, in the actual forwarding process, the sender or the receiver can stamp the time of the respective sent or received messages, and the reference time of the time stamps is consistent.
Step 3, calculating the network delay of each hop, and obtaining the actual forwarding delay of each AVB network bridge, the specific process is as follows:
network jitter arises because of delay variation, which for a network consisting of multiple network nodes, is accumulated as end-to-end jitter. The actual forwarding delay of each AVB bridge is calculated and used for step 4 delay compensation.
In one possible implementation, the actual forwarding delay of the specified traffic is obtained by adding timestamps at the entry (Ingress) and the exit (Egress) of the AVB bridge and calculating the difference between the timestamps at the exit. As shown in fig. 3, which is an information flow diagram of the present embodiment, at the entry of the AVB bridge 100, for the Frame2Time stamped, recorded as TIntoAnd the corresponding AVB queue priority is SR-Class A, and the AVB queue is forwarded after being shaped by CBS. At the egress of the AVB bridge 100, it is time stamped and recorded as TGo outAVB bridge calculates Frame2Has an actual forwarding time of TGo out-TIntoAnd stored in a cache.
Step 4, establishing a delay compensation mechanism model, which comprises the following specific processes:
in order to ensure that the sum of the entry rates (Ingress) of each AVB bridge does not exceed the exit rate (Egress), the entry of the next AVB bridge needs to compensate the difference between the actual forwarding delay of the previous AVB bridge and the theoretical forwarding delay planned in advance before forwarding. Meanwhile, for the data frames with the actual forwarding delay lower than the theoretical forwarding delay, the priority used in the last AVB bridge can be properly reduced, and all the data frames can meet the theoretical forwarding delay planned in advance.
In one possible implementation, a compensator is added at the entry (Ingress) of the AVB bridge. As shown in FIG. 3, the AVB bridge 100 queries its configuration table for the Frame2At the maximum allowable forwarding delay T of the hopMAXAnd calculating the time delta T needed to be compensated by the AVB bridge, wherein the delta T is TMAX-(TInto-TGo out) The value is the difference between the actual forwarding delay and the theoretical delay. After receiving the message, AVB bridge 110 repeats the timestamping action of step 3. And the compensator 200 compensates for the at, such as in a buffered manner. Simultaneously, according to the requirements of other data frames, the Frame is processed2Is adjusted, e.g., from SR-Class a to SR-Class B. Through a hop-by-hop delay compensation mechanism (waiting for or increasing the priority), the jitter of all network nodes except the last network node can be guaranteed to be basically 0, namely through the compensation mechanism, the jitter of other network nodes except the last network nodeThe jitter value is substantially 0.
Step 5, calculating an end-to-end jitter maximum value for verifying jitter optimization performance, wherein the specific process is as follows:
according to the exit (Egress) queuing condition of the last AVB bridge, the queue exit time of each stream (stream) at the exit of the last AVB bridge is calculated by combining the forwarding order (such as priority) of each stream (stream), and the queue exit time is the maximum end-to-end jitter of the stream.
Assume that AVB bridge 110 is the last hop of the overall transmission path and its egress employs an SP queue, i.e., strict priority queue scheduling, Frame2Possibly at the very front of the SP queue and possibly at the very end of the SP queue. Its corresponding jitter is the transmit time for the length of the egress SP queue of AVB bridge 110. If N data frames are queued in the queue, the frame lengths are all L, the outlet bandwidth is B, the actual jitter value is
The actual jitter value is the end-to-end jitter maximum value, namely, the jitter optimization is realized through the steps.
According to the vehicle-mounted Ethernet AVB jitter optimization method, the Ethernet is adopted, so that the problem that the interoperability of the traditional vehicle-mounted bus is poor is solved; the AVB protocol is adopted, so that the delay of vehicle-mounted audio and video transmission is met; the jitter characteristic of the AVB protocol is obviously improved by adopting the technologies of a per-hop delay compensation mechanism, priority dynamic allocation and the like.
Those skilled in the art can understand that all or part of the flow of the method for implementing the above embodiments can be completed by a system corresponding to computer program instructions, and the system for vehicle-mounted ethernet AVB jitter optimization includes: the constraint control module is used for establishing constraint conditions to realize admission control; the time synchronization module is used for establishing time synchronization and carrying out time synchronization calibration on the sending end, the AVB network bridge and the receiving end; the network delay module is used for calculating the network delay of each hop based on the result of the time synchronization module and obtaining the actual forwarding delay of each AVB network bridge; the delay compensation module receives the result of the network delay module and establishes a delay compensation mechanism model for reducing the jitter value of a single network node; and the calculation boundary module receives the result of the delay compensation module, calculates the maximum value of end-to-end jitter and verifies the jitter optimization performance. The program of the system may be stored in a computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The invention and its embodiments have been described above schematically, without limitation, and the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The representation in the drawings is only one of the embodiments of the invention, the actual construction is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (8)
1. A vehicle-mounted Ethernet AVB jitter optimization method is characterized by comprising the following steps:
step 1, planning admission control in advance through an offline configuration tool, and establishing constraint conditions;
step 2, establishing time synchronization, and carrying out time synchronization calibration on a sending end, an AVB network bridge and a receiving end;
step 3, calculating the network delay of each hop, and acquiring the actual forwarding delay of each AVB network bridge;
step 4, according to the result of the step 3, establishing a delay compensation mechanism model for reducing the jitter value of a single network node;
step 5, obtaining an end-to-end jitter maximum value for verifying jitter optimization performance;
the step 4 comprises the following steps: before forwarding, the entrance of the next AVB bridge compensates the difference between the actual forwarding delay of the last AVB bridge and the theoretical forwarding delay planned in advance;
the compensation mode is that a compensator is added at an entrance of the AVB network bridge and is used for compensating the difference value between the actual forwarding delay and the theoretical forwarding delay planned in advance;
the step 4 further comprises: for the data frames with the actual forwarding delay lower than the theoretical forwarding delay, the priority used in the last AVB network bridge is reduced, and all the data frames can meet the theoretical forwarding delay planned in advance.
2. The vehicle-mounted ethernet AVB jitter optimization method of claim 1, wherein the constraint conditions in step 1 are: at the ingress of each AVB bridge, the sum of the rates of all traffic cannot exceed the egress rate of the AVB bridge, with the relationship:
wherein λiIs the rate of the ith stream and iota is the AVB bridge egress rate.
3. The method according to claim 1, wherein the specific process of step 2 includes: the sending end sends the time synchronization frame at time t1, the receiving end returns the data frame containing time t2, the sending end receives the data frame containing time t2 at time t4, and the receiving end sends the data frame containing time t3 while returning the data frame containing time t2 for link delay compensation, then the time offset d between the sending end and the receiving end is:
d＝((t2-t1)+(t4-t3))/2
and d is the original time deviation of the sending end and the receiving end, and the sending end or the receiving end adjusts the respective internal time according to d so that the internal time reference of each end device is the same.
4. The on-vehicle ethernet AVB jitter optimization method of claim 1, wherein said step 3 comprises: and adding time stamps to the entrance and the exit of the AVB bridge, and calculating the difference value of the entrance and the exit of the AVB bridge to obtain the actual forwarding delay of each AVB bridge.
5. The on-vehicle ethernet AVB jitter optimization method of claim 1, wherein said step 5 comprises: and according to the exit queuing condition of the last AVB bridge and by combining the forwarding sequence of each flow, calculating the exit queuing time of each flow at the exit of the last AVB bridge, namely the maximum jitter value of the flow.
6. The method as claimed in claim 5, wherein in step 5, the relation of the actual jitter value is
The actual jitter value is the maximum end-to-end jitter value, where N represents the number of data frames queued in the queue, L represents the frame length, and B represents the egress bandwidth.
7. An on-board ethernet AVB jitter optimization system, wherein the system performs the method of any of claims 1-6, the system comprising:
the constraint control module is used for establishing constraint conditions to realize admission control;
the time synchronization module is used for establishing time synchronization and carrying out time synchronization calibration on the sending end, the AVB network bridge and the receiving end;
the network delay module is used for calculating the network delay of each hop based on the result of the time synchronization module and obtaining the actual forwarding delay of each AVB network bridge;
the delay compensation module receives the result of the network delay module and establishes a delay compensation mechanism model for reducing the jitter value of a single network node;
and the calculation boundary module receives the result of the delay compensation module to obtain an end-to-end jitter maximum value for verifying jitter optimization performance.
8. A readable storage medium, characterized in that the storage medium stores a computer program comprising program instructions which, when executed by a processor, cause the processor to carry out the method of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011626359.1A CN112600739B (en) | 2020-12-31 | 2020-12-31 | Vehicle-mounted Ethernet AVB jitter optimization method, system and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011626359.1A CN112600739B (en) | 2020-12-31 | 2020-12-31 | Vehicle-mounted Ethernet AVB jitter optimization method, system and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112600739A CN112600739A (en) | 2021-04-02 |
| CN112600739B true CN112600739B (en) | 2022-05-31 |
Family
ID=75206659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011626359.1A Active CN112600739B (en) | 2020-12-31 | 2020-12-31 | Vehicle-mounted Ethernet AVB jitter optimization method, system and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112600739B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101731011A (en) * | 2007-05-11 | 2010-06-09 | 奥迪耐特有限公司 | Systems, methods and computer-readable media for configuring receiver latency |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6765905B2 (en) * | 2002-04-18 | 2004-07-20 | Motorola, Inc. | Method for reducing packet data delay variation in an internet protocol network |
| WO2018166576A1 (en) * | 2017-03-13 | 2018-09-20 | Siemens Aktiengesellschaft | Method and device for time-controlled data transmission in a tsn |
| US10798012B2 (en) * | 2017-10-30 | 2020-10-06 | Cisco Technology, Inc. | Jitter elimination and latency compensation at DetNet transport egress |
| CN108556683B (en) * | 2018-04-20 | 2021-03-02 | 江铃汽车股份有限公司 | New energy vehicle ride comfort optimization method based on big data |
| CN111327386B (en) * | 2018-12-14 | 2023-08-08 | 深圳市中兴微电子技术有限公司 | Delay jitter compensation method and device and computer storage medium |
-
2020
- 2020-12-31 CN CN202011626359.1A patent/CN112600739B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101731011A (en) * | 2007-05-11 | 2010-06-09 | 奥迪耐特有限公司 | Systems, methods and computer-readable media for configuring receiver latency |
Non-Patent Citations (2)
| Title |
|---|
| 基于实时以太网的网络化数控系统高精度时钟同步和短周期通信;黄威然等;《计算机集成制造系统》;20151015(第10期);全文 * |
| 面向智能汽车的Ethernet AVB网络设计与优化;王跃飞等;《机械工程学报》;20190330(第06期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112600739A (en) | 2021-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112087804B (en) | Time-sensitive network gating time slot adjusting method and system | |
| Alparslan et al. | Next generation intra-vehicle backbone network architectures | |
| Reimann et al. | Timing analysis of Ethernet AVB-based automotive E/E architectures | |
| US20020009054A1 (en) | Device and method for reducing delay jitter in data transmission | |
| CN113068263B (en) | Time slot scheduling method for time-sensitive network, terminal and storage medium | |
| US20040114516A1 (en) | Packet scheduling apparatus | |
| EP3590238B1 (en) | Reducing packet delay variation of time-sensitive packets | |
| CN112738843B (en) | High-rate 5G uplink congestion control method for determining communication delay | |
| KR101100005B1 (en) | Encapsulating packets into a frame for a network | |
| US7391777B2 (en) | Distance-sensitive scheduling of TDM-over-packet traffic in VPLS | |
| CN108418723B (en) | Vehicle-mounted Ethernet AVB reserved bandwidth optimal configuration method | |
| CN112822268B (en) | Multi-service coexistence and IP layer packet scheduling method in industrial Internet of things | |
| US10666568B2 (en) | Timing transport method in a communication network | |
| CN113271256A (en) | Information age multi-path transmission method and system | |
| CN112600739B (en) | Vehicle-mounted Ethernet AVB jitter optimization method, system and storage medium | |
| WO2020222289A1 (en) | Method implemented by computer means of a communicating entity in a packet-switched network, and computer program and computer-readable non-transient recording medium thereof, and communicating entity of a packet-switched network | |
| CN113206724B (en) | Predictable deterministic scheduling method and device suitable for quasi-dynamic link | |
| CN112751715B (en) | Bandwidth reservation optimization method, system and storage medium of vehicle-mounted AVB protocol | |
| CN117200961A (en) | Self-adaptive adjustment algorithm based on time perception shaper | |
| JPS59190757A (en) | Packet communication system | |
| Soni et al. | Integrating offset in worst case delay analysis of switched ethernet network with deficit round robbin | |
| CN117014384A (en) | Message transmission method and message forwarding equipment | |
| AU2008800A (en) | Queue management in packet switched networks | |
| KR20230020210A (en) | Time control scheduling method and system for supporting non-isochronous emergency traffic in time-sensitive networks | |
| Fukui et al. | Delay-based shaper with dynamic token bucket algorithm for deterministic networks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |