CN107508648A - Time triggered Ethernet substep time synchronized strategy based on functions of the equipments classification - Google Patents
Time triggered Ethernet substep time synchronized strategy based on functions of the equipments classification Download PDFInfo
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- CN107508648A CN107508648A CN201710494273.XA CN201710494273A CN107508648A CN 107508648 A CN107508648 A CN 107508648A CN 201710494273 A CN201710494273 A CN 201710494273A CN 107508648 A CN107508648 A CN 107508648A
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- time
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- interchanger
- ethernet
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
- H04J3/0697—Synchronisation in a packet node
Abstract
The invention provides a kind of time triggered Ethernet substep Time Synchronization Mechanism based on functions of the equipments classification, belong to onboard networks communication technical field.By time triggered Ethernet (Time Triggered Ethernet, TTE Principle of Communication) is understood, time triggered information frame only relies upon the local zone time of present node in transmitting procedure, can the key that next node is reached in desired time window be time deviation between adjacent node, unrelated with the time reference and time deviation of history node.For this feature, the substep time synchronized strategy based on functions of the equipments classification is proposed, time synchronized is realized between switch device first, the time reference of interchanger is then synchronized to its subnet end node using the master-slave mode method of synchronization.The advantages of time synchronized strategy, is that precision is high and simply easily realizes, can effectively reduce the time synchronized deviation between adjacent node.
Description
Technical field
The invention belongs to onboard networks communication technical field, is related to a kind of Time Synchronization Mechanism.
Background technology
Time triggered Ethernet (Time-Triggered Ethernet, TTE) can effectively improve onboard networks communication system
Real-time and reliability, be one of the main direction of development of the following advanced onboard networks communication technology.But time triggered leads to
Letter mechanism realizes that data communicate using the time as trigger condition, so whole network performance is very sensitive to timing tracking accuracy.When
Between trigger the switching network topology structure that Ethernet uses, there is communication system network structure and network size very big uncertain
Property, have a strong impact on the timing tracking accuracy of system.In addition, the drift of the uncertainty, clock frequency of switch device Forwarding Latency
The problems such as shifting problem, uncertainty of Network Transmission Delays, has a significant impact to time synchronized performance.Therefore, in time triggered
Realize that precise synchronization has very big technological challenge between Ethernet global node.
The content of the invention
In view of the above-mentioned problems, being easily achieved it is an object of the invention to provide one kind, being simple and practical, while meet that the time touches
Send out the precise synchronization strategy of communication mechanism communication requirement.
Based on the time triggered Ethernet substep time synchronized strategy of functions of the equipments classification, the time triggered Ethernet is extremely
Interchanger and end node are included less, it is characterised in that are comprised the steps of：
(1) time synchronized between interchanger：When being carried out in the time triggered Ethernet between all switch devices
Between it is synchronous, form local unified time reference；
(2) time synchronized of end node：Switch device in the time triggered Ethernet is as its internal subnet end
The timing reference input of node, time reference is provided for end node using the master-slave mode method of synchronization, realize global network node when
Between it is synchronous.
Alternatively, classified according to the functional characteristics of equipment in the time triggered Ethernet, realize that the substep time is same
Step.
Alternatively, the interchanger is time triggered Ethernet switch.
Alternatively, the end node is the end node for supporting time triggered ethernet communication.
Alternatively, the time synchronized in the time triggered Ethernet between interchanger and only between switch device
Carry out.
Alternatively, the time reference reference value of all end nodes is all from the time and touched in the time triggered Ethernet
Send out the switch device in Ethernet.
The present invention is that the precise synchronization of time triggered Ethernet, the synchronous plan can be achieved using above technical scheme
Slightly the advantages of, is that of avoiding the synchrodata exchange process of complexity, reduces data traffic, improves resource utilization, simultaneously
The timing tracking accuracy between network node is ensure that, meets the time synchronized requirement of time triggered communication mechanism.By time triggered
The particularity of time reference is required ethernet communication mechanism and network structure feature is understood, the substep time proposed by the invention
Synchronization policy scheme is reasonable, and feasibility is strong, suitable for the onboard networks communication system of reality.
Brief description of the drawings
Fig. 1：The schematic diagram of substep time synchronized strategy of the present invention.
Fig. 2：TTE example communications systems.
Fig. 3：TTE data communication sequential charts.
Fig. 4：Substep time synchronized schematic diagram.
Embodiment
The invention will be further described with example below in conjunction with the accompanying drawings, and scheme described herein is only used for providing to this
Invention is further understood, and is the part of the application, is not formed the restriction to the present invention program.
For ease of understanding, first by taking network shown in Fig. 2 as an example, the communication of time triggered information frame is briefly introduced
Journey.It can be seen from the Principle of Communication of time triggered Ethernet, for a specific information frame M1 by node N1 through interchanger SW1
Node N2 is reached with SW2, its communication process is as shown in Figure 3：Node N1 is in a default set time node T1 by information M1
Send to interchanger SW1, interchanger SW1 has receive window the time for message M1.If M1 receives in the corresponding time
Interchanger SW1 is reached in window, then is correctly received.Therefore, what can M1 be correctly received depend critically on end node N1 and
The time deviation of two adjacent nodes of interchanger SW1.Interchanger SW1 is after detection and judging that information M1 is errorless, according to data frame
Destination address sends it to interchanger SW2 in default time point T2, and now the time reference of its foundation is interchanger SW1
Local zone time.Equally, can exchange SW2 also has a reception window for being directed to message M1, and its key that correctly be received
It is unrelated with the time reference and time deviation of history node dependent on the time deviation of two adjacent nodes of SW1 and SW2.With this
Analogize, message M1 is sent to node N2 according to SW2 local time reference and predetermined instant, if receiving window in the corresponding of node N2
Mouth reaches, and detection is errorless, then message M1 is successfully sent to node N2 by node N1.
As can be seen here, time triggered message only relies upon the time reference of present node in transmitting procedure and works as prosthomere
Point next node between time deviation, and the time reference of history node and deviation it is unrelated.
Therefore, by taking Fig. 4 as an example, summary swaps net knot using the substep time synchronized strategy based on functions of the equipments classification
Time synchronization process under structure between global node, time synchronization node is divided into two according to the functional characteristics of each equipment in switching network
Part, switch device and subnet end node.For convenience of introduction, one is chosen between the peer-to-peer network of switch device composition here
Individual clock reference node, the time synchronized between machine equipment is swapped using the synchronous method of master-slave mode.In practical application,
Consider that reliability etc. factor can also use other times synchronous method to swap the time synchronized between machine equipment.Specifically
Time synchronized flow it is as follows：
Between switch device, using master-slave network method for synchronizing time, select a clock accuracy very high
Node periodically broadcasts its temporal information as master clock, time reference of its temporal information as global network.Other
Interchanger is forwarded after receiving the temporal information of broadcast and updates local time reference, passes through transparent clock and link delay
Compensation mechanism eliminates the influence of transmission delay, and local clock is synchronized into master clock section using the Time synchronization algorithm of stability and high efficiency
The time reference of point.
Clock master nodes of each interchanger as its internal subnet, it is end segment for the time synchronized of subnet end node
Point provides time reference reference.Because temporal information directly reaches end node in subnet time synchronization process, turn without data frame
Hair process, without the transmission delay compensation mechanism of complexity, only do certain line propagation delay compensation.End node is according to benefit
The time reference of local time reference and interchanger can be consistent by temporal information and Time synchronization algorithm after repaying, so as to
Realize the time synchronized of global network node.
Claims (6)
1. based on the time triggered Ethernet substep time synchronized strategy of functions of the equipments classification, the time triggered Ethernet is at least
Include interchanger and end node, it is characterised in that comprise the steps of：
(1) time synchronized between interchanger：It is same that the time is carried out in the time triggered Ethernet between all switch devices
Step, form local unified time reference；
(2) time synchronized of end node：Switch device in the time triggered Ethernet is as its internal subnet end node
Timing reference input, provide time reference for end node using the master-slave mode method of synchronization, realize that the time of global network node is same
Step.
2. time synchronized strategy according to claim 1, it is characterised in that according to equipment in the time triggered Ethernet
Functional characteristics classified, realize substep time synchronized.
3. according to the interchanger described in claim 1, it is characterised in that the interchanger is time triggered Ethernet exchanging
Machine.
4. according to the end node described in claim 1, it is characterised in that the end node is support time triggered ether Netcom
The end node of letter.
5. the time synchronized between interchanger according to claim 1 step (1), it is characterised in that the time triggered
Time synchronized in Ethernet between interchanger and carried out only between switch device.
6. the time synchronized of the end node according to claim 1 step (2), it is characterised in that the time triggered ether
The time reference reference value of all end nodes is all from the switch device in the time triggered Ethernet in net.
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| CN201710494273.XA CN107508648A (en) | 2017-06-26 | 2017-06-26 | Time triggered Ethernet substep time synchronized strategy based on functions of the equipments classification |
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| CN201710494273.XA CN107508648A (en) | 2017-06-26 | 2017-06-26 | Time triggered Ethernet substep time synchronized strategy based on functions of the equipments classification |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108183762A (en) * | 2017-12-28 | 2018-06-19 | 天津芯海创科技有限公司 | The method for synchronizing time of RapidIO network systems and RapidIO network systems |
| CN111083776A (en) * | 2019-12-05 | 2020-04-28 | 西安电子科技大学 | TTE time synchronization method based on 1588 and AS6802 protocol |
| CN112073229A (en) * | 2020-08-27 | 2020-12-11 | 中国航空无线电电子研究所 | uTTE network system directly connected with standard TTE network system |
| CN113985763A (en) * | 2021-10-12 | 2022-01-28 | 江苏清盐智能科技有限公司 | Time-triggered Ethernet architecture of unmanned combat tank control system |
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| CN101615998A (en) * | 2009-07-31 | 2009-12-30 | 中兴通讯股份有限公司 | A kind of method and system and access switch of in Ethernet, realizing clock synchronization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101615998A (en) * | 2009-07-31 | 2009-12-30 | 中兴通讯股份有限公司 | A kind of method and system and access switch of in Ethernet, realizing clock synchronization |
| US20150043360A1 (en) * | 2011-12-19 | 2015-02-12 | Fts Computertechnik Gmbh | Method for Monitoring, at the Correct Time, TT Ethernet Messages |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183762A (en) * | 2017-12-28 | 2018-06-19 | 天津芯海创科技有限公司 | The method for synchronizing time of RapidIO network systems and RapidIO network systems |
| CN111083776A (en) * | 2019-12-05 | 2020-04-28 | 西安电子科技大学 | TTE time synchronization method based on 1588 and AS6802 protocol |
| CN111083776B (en) * | 2019-12-05 | 2021-09-03 | 西安电子科技大学 | TTE time synchronization method based on 1588 and AS6802 protocol |
| CN112073229A (en) * | 2020-08-27 | 2020-12-11 | 中国航空无线电电子研究所 | uTTE network system directly connected with standard TTE network system |
| CN113985763A (en) * | 2021-10-12 | 2022-01-28 | 江苏清盐智能科技有限公司 | Time-triggered Ethernet architecture of unmanned combat tank control system |
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