EP4295543A1 - Netzwerkknoten für ein fahrzeug - Google Patents
Netzwerkknoten für ein fahrzeugInfo
- Publication number
- EP4295543A1 EP4295543A1 EP22707343.4A EP22707343A EP4295543A1 EP 4295543 A1 EP4295543 A1 EP 4295543A1 EP 22707343 A EP22707343 A EP 22707343A EP 4295543 A1 EP4295543 A1 EP 4295543A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- message
- network node
- time
- messages
- sending
- 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.)
- Pending
Links
Classifications
-
- 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]
- H04L12/40—Bus networks
-
- 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]
- H04L12/40—Bus networks
- H04L12/4013—Management of data rate on the bus
-
- 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]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
-
- 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
- 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
- H04L43/0876—Network utilisation, e.g. volume of load or congestion level
- H04L43/0888—Throughput
-
- 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
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
Definitions
- the invention relates to a network arrangement for a vehicle, a first and a second network node, a method for detecting an asymmetric data transmission rate, and a vehicle.
- Automotive Ethernet currently always offers the same speed for the outward and return direction. In the future, however, different data rates will be available for download and upload.
- the PTP time synchronization protocol used in Automotive Ethernet for synchronizing the cameras, other ADAS functions and, in principle, all control units with an Ethernet connection cannot be used for synchronizing at different data rates.
- Another core problem is, for example, the parallel transmission with electricity for low-frequency signal transmission. Today, this must be compensated for using a special circuit design. If there is knowledge of the inequality, this can be compensated for, for example when the power supply is started, in order to then be able to react dynamically and prevent EMC problems.
- the object of the invention could therefore be to provide an arrangement and a method for detecting different data rates of a connection in a vehicle network.
- the described embodiments relate in a similar way to the network arrangement for a vehicle, the first and the second network node, the method for detecting an asymmetric data transmission rate and the vehicle. Synergy effects may result from various combinations of embodiments, although they may not be described in detail.
- a network node for a vehicle being a first network node and being set up to communicate with a further network node and to recognize a data transmission rate symmetry.
- the first network node has a first communication unit and a first computing unit.
- the first communication unit is set up to detect data transmission rate symmetry, with the steps:
- S1 sending a first message N1 and storing a first time stamp t1, which indicates the sending time of the first message N1, by a first network node
- S2 sending a second message N2 after sending the first message N1 and storing a second time stamp t2, which indicates the time of transmission of the second message N2, by the first network node
- S3 receiving a third message N3 and storing a seventh time stamp t7, which indicates the time of transmission of the third message N3, by a first Network node
- S4 receiving a fourth message N4, which was sent after the third message N3, and storing an eighth time stamp t8, which indicates the time at which the fourth message N4 was sent, by a first network node.
- the messages N1, N2, N3, N4 have at least approximately the same data length or are projected onto approximately the same data length.
- the first processing unit is set up to detect, S5, a data transmission rate symmetry using the first time stamp t1, the second time stamp t2, the seventh time stamp t7 and the eighth time stamp t8.
- the first communication module is set up to use the mentioned time stamp to recognize whether a data rate in the transmission direction is the same or different from the data rate in the reception direction, ie whether there is a data transmission rate symmetry or not. This is achieved by two messages in the sending direction and two corresponding messages in the receiving direction.
- the first communication module knows the times at which it sent the messages it sent to a remote station, for example a second communication module, and at which it received the messages it received. Furthermore, the first communication module is informed of the reception times when the first two messages were received from the remote station by the two messages that the remote station sends to the first communication module. It is important here that the messages are each sent immediately.
- the received messages must also be messages that were generated immediately one after the other, because the time stamp is used to measure the time of the message length, i.e. according to the data rate multiplied by the number of message lengths in bits.
- a distance interval between the respective messages sent on one side is at least for the determination of the Data rate symmetry irrelevant as long as it's the same on both sides. However, it must be taken into account for the data rate ratio described below. This can be done by estimation or iteratively if it depends on the data rate.
- the time stamps are defined, for example, as sending or receiving times that relate to the sending or receiving of a specific bit of the message. For example, it refers to the first bit after a header.
- the order of steps S1 to S4 can also be different.
- the order can be S1, S3, S2, S4, so that after sending a message, e.g. N1, a response message, e.g. N3, is first received before the second message, e.g. N3, is sent.
- a message e.g. N1
- a response message e.g. N3
- a reply message is received from the second network node.
- the remarks on the distance interval must be observed here.
- the data rate in the sending direction is higher, then the two messages N1 and N2 are sent faster than the response messages from the remote station. Correspondingly, the receipt of the messages N3 and N4 takes longer.
- the data rate in the transmit direction is higher when the quotient Vdr ⁇ 1 and lower when the quotient Vdr > 1.
- the quotient does not necessarily indicate the exact data transmission ratio due to latencies that can arise, for example, due to processing according to a transmission protocol, due to the hardware, etc. Any distance between, for example, the sending of the last bit of the message N1 and the first bit of the message N2 can also affect the quotient Vdr and can be taken into account for the data rate ratio by being subtracted from the differences.
- the distance interval can be estimated or iteratively if it depends on the data rate. However, it is also possible, for example, to measure once under defined conditions and store the value or values for different data rates.
- the periods of time d_a1 and d_a2 can be the same. They can also be 0, so that the messages N1 and N2 or N3 and N4 are sent one after the other. If d_a1 and d_a2 are close to zero, they can also be neglected.
- the message sequence is N1, N2, N3 and N4 it could be that this does not conform to a standard that only provides for the sending of a response message in normal operation, i.e. the sequence N1, N3 and possibly also N5 and then N2, N4 and N6. Both types of sequence are possible by considering the time spans. In the non-standard case, you could briefly switch to another mode, eg a test mode.
- an interval can also be specified that generally takes these possible delays into account.
- Other variants are possible.
- the transmission or reception data rate can also be determined with the quotient Vdr, which may contain the corrections described, if a reception or transmission rate is known. It would also be possible to compare the quotient with possible quotients of available data rates in order to infer both the transmission data rate and the reception data rate.
- the first communication unit is also set up to receive messages N5 and N6 that contain the transmission time stamps t5 and t6 of the messages N3 and N4; and wherein at least one of the received messages N3, N4 has at least one reception time stamp t3, t4 of the sent messages N1, N2, and the first processing unit is set up to calculate a runtime of the messages N1, N2, N3 or N4 and/or a clock offset a clock determining the time stamps t3, t4, t5, t6 from the time stamps of one of the transmitted messages N1, N2 and one of the received messages N3, N4.
- the reception time stamp indicates the times at which the messages were received at the remote station.
- the running time and the clock offset of the clock determining the time stamps t3, t4, t5, t6, ie the clock of the remote station are thus calculated or estimated.
- the clock on the remote station is usually synchronized using the calculated clock offset.
- the detection of the data rate ratio before the calculation of the quotient Q includes the step of determining a clock deviation from the difference deltaC of the difference t2-11 of the time stamps t1, t2 and the difference t4-t3 of the reception time stamp of the transmitted messages N1, N2, and recognizing the data rate ratio takes into account the clock deviation.
- clock deviation is understood to mean a deviation from a linear clock progression, e.g. due to a clock drift, a change in the clock drift or other random and/or systematic deviations.
- the clock deviation is therefore a relative deviation of the clocks from one another and should not be confused with the absolute clock offset described above.
- the clock deviation can be taken into account when defining the interval (1 + delta_x1 ) ... (1 - delta_x2). Furthermore, it can be determined that recognition of the symmetry is not possible if the clock deviation is too large.
- the processing unit is also set up to determine the clock deviation, a statistical value d_s from additional time stamps of further messages sent and the corresponding reception time stamps of the further messages sent.
- a statistical value or values are calculated from several clock deviation determinations, such as an average, a standard deviation, etc. For this, steps S1-S4 can be performed several times so that the statistics are made possible.
- detecting the data rate mismatch includes determining that the data transmission rate is greater in the transmit direction than in the receive direction when: (t2-11) ⁇ ((t8+d_S)-(t7-d_S)); the data transmission rate in the sending direction is lower than in the receiving direction if the following applies: (t2 - d_S - 11) > ((t8 - d_S) - (t7 + d_S)); and otherwise the data transmission rates are the same in the sending direction and in the receiving direction.
- This can be used as an alternative method to the symmetry detection described above, or as an additional condition.
- the communication unit is set up to carry out steps S1 to S4 repeatedly, and the first arithmetic unit is set up, the time stamps t1, t2, t7 and t8 used to detect a data rate inequality are each a value averaged over the repetitions from the respective individual time stamps t1 , t2, t7 and t8 to be calculated.
- the individual values are averaged in order, for example, to compensate for statistical clock deviations.
- the network node is an Electronic Control Unit (ECU).
- ECU Electronic Control Unit
- Such a unit can be, for example, an antenna, a camera, a radar sensor or another corresponding unit for a vehicle known to those skilled in the art.
- the transmission protocol is an Ethernet protocol.
- messages N1 and N2 are Ethernet PDelay_Request messages and messages N3 and N4 are Ethernet PDelay_Response messages of the Ethernet protocol.
- the computing unit is also set up to check, based on the calculated data transmission rate, whether power is being transmitted in the transmission direction at a sufficiently high frequency to avoid interference, and to adjust the frequency accordingly, and/or to supply power to the network node regulate.
- a network arrangement for a vehicle has a first network node, as described herein, and a second network node with a second communication unit.
- the second communication unit is set up to communicate with the first communication unit of the first network node and to receive the message N1 of the first communication unit of the first network node and to generate a reception time stamp t3, to receive the message N2 of the first communication unit of the first network node and a reception time stamp t4 to generate, provide and send the message N3 containing the generated reception timestamp t3, and to provide and transmit the message N4 containing the generated reception timestamp t4.
- a second network node for a network arrangement is provided.
- the second network node can be an ECU for a vehicle.
- a method for detecting an asymmetric data transmission rate in a network arrangement (100) for a vehicle (500) is provided with the following steps:
- S1 Sending a first message N1 and storing a first time stamp t1, which indicates the time when the first message N1 was sent, by a first network node;
- S2 Sending a second message N2 immediately after sending the first message N1 and storing a second time stamp t2, which indicates the time at which the second message N2 was sent, by the first network node;
- S3 receiving a third message N3 and storing a seventh time stamp t7, which indicates the time of transmission of the third message N3, by a first network node;
- S4 Receiving a fourth message N4, which was sent immediately after the third message N3, and storing an eighth time stamp t8, which indicates the time when the fourth message N4 was sent, by a first network node; wherein the messages N1, N2, N3 N4 have at least approximately the same data length; and and wherein the network node further comprises a first computing unit which is set up for
- a vehicle which has a network arrangement as described herein with a first and a second network node.
- a computer program element can be set up, when it is executed on the processing unit of the first network node, to instruct the network node to carry out the steps of the method described here.
- a computer-readable medium that is part of the network node or that can be accessed by the network node can contain the program element.
- the computer program element can be part of a computer program, but it can also be an entire program in itself.
- the computer program element can be used to update an already existing computer program in order to arrive at the present invention.
- the computer-readable medium can be considered to be a storage medium, such as a thumb drive, CD, DVD, data storage device, hard drive, or any other medium on which a program element as described above can be stored.
- the invention thus allows a data rate symmetry or asymmetry to be detected and different data rates to be determined in the transmission and reception directions in a computing unit of a first network node.
- the processing unit of a second network node is not required.
- An additional flardware is not required.
- With knowledge of the inequality it can also be determined, for example, in which direction the supply current should flow.
- the knowledge can be used to adapt the return channel in such a way that no interference occurs with a parallel power supply, eg in the case that the return channel is too slow.
- the invention also offers the possibility of testing the media in order to also detect errors that occur during configuration or during cabling. These tests are not only invisible, but also do not require any additional resources.
- the sending or receiving of standardized messages and the evaluation of the time stamp is sufficient.
- the application can be optimized or designed with regard to memory consumption (ROM, RAM), real-time capability and any security levels.
- ROM read-only memory
- RAM random access memory
- any security levels any security levels.
- the software can be applied precisely. This improves the synchronization, which also increases the quality of the sensor data.
- the invention also allows software developers and architects to be offered software/applications that can be tailored more flexibly and precisely to the requirements of the application, regardless of the data rate.
- FIG. 3 shows a second timing diagram according to a further exemplary embodiment
- FIG. 5 shows a vehicle according to an exemplary embodiment.
- Fig. 1 shows a network arrangement 100 for a vehicle according to a example.
- the network arrangement 100 has a first network node 110 with a first communication unit 112 and a first processing unit 114, and a first network node 110 with a first communication unit 112 and a second processing unit 124.
- the network nodes 110, 120 communicate with one another by means of the communication units 112 and 122 the connection 130.
- the connection 130 From the point of view of the network node 110, the connection 130 has a sending direction and a receiving direction, whereby the data rates in these two directions can be the same or different, ie the data rates can be “symmetric” or “asymmetric”.
- the reference numeral 210 designates the time axis of the first communication unit 110 with the time scale t' and the reference symbol 220 designates the time axis of the second communication unit 120 with the time scale t".
- the communication unit 110 sends a message N1 211 to the second communication unit 120.
- the first communication unit 110 generates a time stamp t1 which relates to the time of transmission of the first bit after the header of the message N1 211.
- the other time stamps t2 to t8 relate in a corresponding manner to the transmission or reception time of the first bit after the header.
- the arrows illustratively indicate the transmission of the bit associated with the timestamp; the entire message is only sent with the lower end of a data block, e.g.
- the message N 1 211 is received by the second communication unit 120 with a time stamp t3.
- a second message N2 212 is sent immediately after the first message N1 211, generating timestamps t2 and t3.
- the second communication unit 120 then sends response messages N3 213 and N4 214 which contain the time stamps t3 and t4 and the time stamps t5 and t7 or t6 and t8 are generated.
- the messages only serve to transmit the time stamp t5 or t6.
- the time stamps t5 and t6 are sent from the second communication unit 122 to the first communication unit 112 with the messages N5215 and N6 216 . As can be seen in FIG.
- the time stamps t3, t4, t5 and t6 can be evaluated.
- the quotient of the two differences can also be formed, whereby a ratio of the data rates can be determined and thus also an absolute data rate if one of the two data rates is known to the first processing unit 124, or representative ratios for constellations of transmission and reception data rates are known.
- Various corrections can be made when calculating the differences or quotients.
- a distance interval d_a1 or d_a2 which is shown in FIG. 2 merely as an illustration for the transmission distance of the messages N1 and N2 or N3 or N4, can be taken into account.
- the spacing interval may be different or the same for the first and second nodes.
- statistics of the time scales t', t" can be created, which indicate the statistical or also systematic deviations of the clocks from each other, and which are taken into account, for example, by an interval in which the quotient for the recognition of an equality may vary.
- latencies can be taken into account, which can arise, for example, when generating the time stamp due to the processing. Under certain circumstances, these latencies can also be dependent on the data rate.
- the runtime of the messages and the clock offset of the two clocks can be determined, which can be used to synchronize the clocks. For this purpose, any pair can be formed from one of the transmitted messages N1, N2 and one of the received messages N3, N4 and their time stamp can be evaluated.
- FIG. 3 shows a further time diagram according to an exemplary embodiment, which differs from the time diagram in the message sequence, which is N1, N3, N5, N2, N4, N6 here.
- the distance intervals d_a1 and d_a2 change accordingly. In Fig. 3, these are also drawn in different sizes.
- the designations of the messages and the associated time stamps correspond to the messages in FIG. 2.
- the distance intervals d_a1 and d_a2 must be taken into account, for example by subtracting them from the differences will.
- a first message N1 is sent to a second network node 120 by a first network node 110 and a first time stamp t1 is stored, which indicates the time at which the first message N1 was sent.
- a second message N2 is sent by the first network node 110 immediately after the sending of the first message N1 and a second time stamp t2, which indicates the sending time of the second message N2, is generated.
- a third message N3 is received by a first network node and a seventh time stamp t7 is generated, which indicates the time at which the third message N3 was received.
- the received message N3 was sent by the second network node 120 . Furthermore, the second network node 120 generated a time stamp t5. In a fourth step S4, 408, a fourth message N4, which was sent immediately after the third message N3, is received by a first network node, and an eighth time stamp t8 is stored, which indicates the time at which the fourth message N4 was sent. In this case, the received message N4 was sent by the second network node 120 . Furthermore, a time stamp t6 was generated by the second network node 120 for the message N4. The messages N1, N2, N3, N4 have at least approximately the same data length or an unequal data length is taken into account by a factor, for example.
- the first computing unit 114 of the first Network node 110 also carries out step S5, 410, in which a data rate symmetry is detected by means of the first time stamp t1, the second time stamp t2, the seventh time stamp t7 and the eighth time stamp t8.
- FIG. 5 shows a vehicle 500 according to an exemplary embodiment with a network arrangement 100 which has a first network node 110 and a second network node 120 .
- a computer program may be stored/distributed on any suitable medium, such as an optical storage medium or a semiconductor medium, supplied with or as part of other flardware, but may also be distributed in other forms, such as over the Internet or other wired or wireless telecommunications systems be. Any reference signs in the claims should not be construed to limit the scope of the claims.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Quality & Reliability (AREA)
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- General Health & Medical Sciences (AREA)
- Mobile Radio Communication Systems (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021201663.4A DE102021201663A1 (de) | 2021-02-22 | 2021-02-22 | Netzwerkknoten für ein Fahrzeug |
| PCT/DE2022/200015 WO2022174872A1 (de) | 2021-02-22 | 2022-02-03 | Netzwerkknoten für ein fahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4295543A1 true EP4295543A1 (de) | 2023-12-27 |
Family
ID=80625232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22707343.4A Pending EP4295543A1 (de) | 2021-02-22 | 2022-02-03 | Netzwerkknoten für ein fahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240235887A9 (de) |
| EP (1) | EP4295543A1 (de) |
| CN (1) | CN116888928A (de) |
| DE (1) | DE102021201663A1 (de) |
| WO (1) | WO2022174872A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022210800A1 (de) | 2022-10-13 | 2024-04-18 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zum drahtlosen zeitlichen Synchronisieren einer ersten elektrischen Einheit mit einer zweiten elektrischen Einheit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166792B (zh) * | 2011-12-16 | 2017-01-18 | 中国移动通信集团公司 | 线路非对称性补偿方法、设备及系统 |
| WO2015045080A1 (ja) * | 2013-09-26 | 2015-04-02 | 富士通株式会社 | 計測装置、通信装置、中継装置、計測方法および計測プログラム |
| WO2016092242A1 (en) * | 2014-12-11 | 2016-06-16 | Khalifa University of Science, Technology, and Research | Method and devices for clock synchronization over links with asymmetric transmission rates |
| US9961000B2 (en) * | 2015-04-27 | 2018-05-01 | Pollere Inc. | Estimation of network path segment delays |
| US10340957B2 (en) * | 2016-10-28 | 2019-07-02 | Avago Technologies International Sales Pte. Limited | Methods and devices for monitoring optical signals |
| US10389644B2 (en) | 2017-02-14 | 2019-08-20 | The United States Of America As Represented By The Secretary Of The Air Force | Method and apparatus for waveform independent congestion control |
| EP3376249A1 (de) * | 2017-03-17 | 2018-09-19 | Veoneer Sweden AB | Verbesserte objektpositionsdetektion |
| JP2018196038A (ja) * | 2017-05-19 | 2018-12-06 | 住友電気工業株式会社 | 車載通信装置、車載通信システム、同期処理方法および同期処理プログラム |
-
2021
- 2021-02-22 DE DE102021201663.4A patent/DE102021201663A1/de active Pending
-
2022
- 2022-02-03 EP EP22707343.4A patent/EP4295543A1/de active Pending
- 2022-02-03 CN CN202280014942.8A patent/CN116888928A/zh active Pending
- 2022-02-03 WO PCT/DE2022/200015 patent/WO2022174872A1/de not_active Ceased
- 2022-02-03 US US18/278,224 patent/US20240235887A9/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021201663A1 (de) | 2022-08-25 |
| US20240235887A9 (en) | 2024-07-11 |
| WO2022174872A1 (de) | 2022-08-25 |
| US20240137246A1 (en) | 2024-04-25 |
| CN116888928A (zh) | 2023-10-13 |
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