Transceiver, Transceiver Startup Method and Communication System

Abstract

Transceiver, method for starting transceiver, and communication system. The transceiver is connected to an in-vehicle communication line and has a detection unit configured to detect a signal standardized on the in-vehicle communication line. The transceiver is completely started when a second start signal, which is different from a first start signal detected by the detection unit and includes identification information for identifying the transceiver on the in-vehicle communication line, is detected within a certain time from when the first start signal is detected.

Description

Technical Field

[0001] This disclosure relates to communication technologies in vehicle-mounted communication lines. Background Technology

[0002] The vehicle-mounted system described in Japanese Patent Application Publication No. 2024-018509 includes multiple vehicle-mounted ECUs and vehicle-mounted devices connected to a vehicle-mounted communication line. The multiple vehicle-mounted ECUs are connected to the vehicle-mounted communication line via a communication disconnection unit. The vehicle-mounted device outputs a disconnection signal to the communication disconnection unit corresponding to a vehicle-mounted ECU that does not need to be started, disconnecting the ECU from the vehicle-mounted communication line. Then, the vehicle-mounted device sends a start signal to the vehicle-mounted ECU that needs to be started, causing the ECU to start. Thus, the aforementioned vehicle-mounted system suppresses the starting of vehicle-mounted ECUs that do not need to be started, thereby reducing power consumption.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2024-018509 Summary of the Invention

[0004] In the aforementioned vehicle system, in addition to the vehicle communication lines, the vehicle device is also connected to each communication cut-off unit via signal lines. The vehicle device needs to output a cut-off signal to the communication cut-off unit corresponding to the vehicle ECU that does not need to be started via the signal lines.

[0005] This disclosure provides a communication technology that enables control of startup on a node-by-node basis using standardized signals on an in-vehicle communication line.

[0006] One aspect of this disclosure involves a transceiver connected to a vehicle communication line, comprising a detection unit configured to detect signals standardized on the vehicle communication line. The transceiver is configured to fully activate upon detecting a second activation signal, which differs from the first activation signal and includes identification information for recognizing the transceiver on the vehicle communication line, within a certain time period following the detection of a first activation signal by the detection unit.

[0007] One aspect of this disclosure involves a transceiver that fully activates upon detecting a standardized second activation signal within a certain timeframe following the detection of a standardized first activation signal. Therefore, the transceiver can activate on a node-by-node basis based on standardized signals on the vehicular communication line.

[0008] In another aspect of this disclosure, the method for starting a transceiver connected to an in-vehicle communication line involves detecting a first start signal that is standardized on the in-vehicle communication line, and if, within a certain period of time from the detection of the first start signal, a second start signal that is different from the first start signal, is standardized on the in-vehicle communication line, and contains identification information of the network to which the transceiver belongs, is detected, then the transceiver is fully started.

[0009] The above-described transceiver startup method achieves the same effect as the transceiver described above.

[0010] Another aspect of this disclosure describes a communication system comprising a transmitting device, a receiving device, and a control device connected to an in-vehicle communication line. The transmitting device is configured to generate and transmit a first activation signal standardized on the in-vehicle communication line. The receiving device is configured to receive the standardized signal on the in-vehicle communication line. The control device is configured to fully activate the system if, within a certain time after receiving the first activation signal from the receiving device, the receiving device receives a second activation signal that is different from the first activation signal and includes identification information for identifying the receiving device on the in-vehicle communication line.

[0011] According to the above communication system, a node on the vehicle communication line can be activated independently upon request from other nodes.

[0012] Another aspect of this disclosure describes a communication system comprising a transmitting device, a receiving device, a first control device, and a second control device connected to a vehicle-mounted communication line. The transmitting device is configured to generate and transmit a first activation signal standardized on the vehicle-mounted communication line. The first control device is configured to, after transmitting the first activation signal to the vehicle-mounted communication line, generate and transmit a second activation signal standardized on the vehicle-mounted communication line, which includes identification information for identifying the receiving device on the vehicle-mounted communication line. The receiving device is configured to receive the standardized signal on the vehicle-mounted communication line. The second control device is configured to fully activate the system if, within a certain time after receiving the first activation signal, the receiving device receives the second activation signal.

[0013] According to the above communication system, since the first control device generates a second start signal, it is possible to selectively start the nodes on the vehicle communication line while reducing the burden on the transmitting device. Attached Figure Description

[0014] Figure 1 This is a diagram illustrating an example of the structure of the communication system according to the first embodiment.

[0015] Figure 2 This is a diagram showing the structure of the ECU included in the communication system of the first embodiment.

[0016] Figure 3 This is a block diagram showing the functional structure of the transceiver in the first embodiment.

[0017] Figure 4 This is a diagram illustrating the format of the NM message in the first embodiment.

[0018] Figure 5 This is a flowchart illustrating the process performed by the transceiver in the startup state of the first embodiment to start other nodes.

[0019] Figure 6 This is a flowchart illustrating the startup process performed by the transceiver in the dormant state of the first embodiment.

[0020] Figure 7 This is a flowchart illustrating the process performed by the transceiver in the startup state of the second embodiment to start other nodes.

[0021] Figure 8 This is a flowchart of the process performed by the controller, which represents the startup state of the second embodiment, to start other nodes. Detailed Implementation

[0022] (1. First implementation method) <1-1. Structure> <1-1-1. Structure of Vehicle-Mounted Communication System> Reference Figure 1 and Figure 2 The structure of the vehicle communication system 100 according to this embodiment will be described. The vehicle communication system 100 is mounted on a vehicle and includes a vehicle communication line 5 and multiple nodes connected to the vehicle communication line 5.

[0023] The vehicle communication line 5 consists of Ethernet signal lines corresponding to the Ethernet (registered trademark) protocol. Specifically, the vehicle communication line 5 is a bus-type Ethernet communication line. More specifically, the vehicle communication line 5 is an Ethernet communication line specified by 10BASE-T1S. In another embodiment, the vehicle communication line 5 is not limited to a bus-type Ethernet communication line, but can also be a star-type Ethernet communication line such as 10BASE-T1. Alternatively, the vehicle communication line 5 can also be a communication line corresponding to a protocol other than Ethernet. For example, the vehicle communication line 5 can be a CAN communication line corresponding to the Controller Area Network (CAN) protocol, or a FlexRay communication line corresponding to the FlexRay protocol.

[0024] The multiple nodes include a first electronic control unit (ECU) 10, a second ECU 20, a sensor 40, and an actuator 50. The first ECU 10 is, for example, the right front door ECU of the vehicle, controlling the locking / unlocking of the right front door and the opening / closing of the power window. The second ECU 20 is, for example, the left front door ECU of the vehicle, controlling the locking / unlocking of the left front door and the opening / closing of the power window. The sensor 40 is, for example, a door sensor that detects the opening and closing of the door. The actuator 50 is, for example, a motor that generates the driving force for opening and closing the power window. In another embodiment, the first ECU 10 may be an Ethernet switch or connected to other ECUs (e.g., a domain ECU, a region ECU) not shown. Furthermore, the multiple nodes may be any combination of ECUs, sensors, actuators, etc.

[0025] The first ECU 10, the second ECU 20, the sensor 40, and the actuator 50 each include a controller 3 and a transceiver 4. The controller 3 includes a processor 31 and a memory 32. The processor 31 performs various processes by executing various programs stored in the memory 32. For example, the controller 3 performs processes related to communication via the vehicle communication line 5. The memory 32 includes, for example, random access memory (RAM) and flash memory. The RAM is used as a working area when the processor 31 performs processing. The flash memory stores the programs. In this embodiment, the controller 3 corresponds to the control unit and the second communication device of this disclosure.

[0026] Transceiver 4 is an interface installed at the physical layer in the OSI reference model. Specifically, transceiver 4 is a physical layer transceiver (specifically, a PHY) conforming to the Ethernet protocol specified by 10BASE-T1S. Transceiver 4 is directly connected to the vehicle communication line 5. Controller 3 is connected to transceiver 4 via signal lines, and is connected to the vehicle communication line 5 via transceiver 4. Transceiver 4 communicates with other transceivers 4 via the vehicle communication line 5. Transceiver 4 sends various data to and receives various data from the vehicle communication line 5. In this embodiment, the transceiver 4 of the first ECU 10 corresponds to the transmitting device of this disclosure, and the controller 3 of the first ECU 10 corresponds to the first control device of this disclosure. In addition, the transceiver 4 of the second ECU 20 corresponds to the receiving device of this disclosure, and the controller 3 of the second ECU 20 corresponds to the control device and the second control device of this disclosure.

[0027] <1-1-2. Transceiver Structure> Reference Figure 3An example of the functional structure of transceiver 4 will be described. Transceiver 4 includes a Media Independent Interface (MII) 41, a start signal generation / detection unit 42, a Physical Coding Sublayer (PCS) 44, and a Physical Media Attachment (PMA) 45. MII 41, start signal generation / detection unit 42, PCS 44, and PMA 45 are sequentially arranged between controller 3 and vehicle communication line 5, with MII 41 positioned closest to controller 3.

[0028] MII41 is the interface between the physical layer and the Media Access Control (MAC) layer. The MAC is based on the Ethernet standard IEEE 802.3 and is installed in the data link layer of the OSI reference model. The MAC is configured in controller 3. MII41 receives transmit data in Ethernet MII format from the MAC and sends the transmit data to the start signal generation / detection unit 42. Additionally, MII41 sends receive data received from the start signal generation / detection unit 42 to the MAC in Ethernet MII format.

[0029] When the transceiver 4 is in the powered-on state, the start signal generation / detection unit 42 receives a start signal transmission instruction from the controller 3 via the MII 41, generates a first start signal as transmission data, and transmits the first start signal. Furthermore, the start signal generation / detection unit 42 generates a second start signal as transmission data and transmits the second start signal within a certain period of time after transmitting the first start signal.

[0030] Furthermore, upon receiving a first start signal from the vehicle communication line 5 via PMA 45 and PCS 44, the start signal generation / detection unit 42 partially activates the transceiver 4 in its dormant state. In other words, the start signal generation / detection unit 42 increases the activation function (i.e., the power receiving function) of the transceiver 4 in its dormant state. In the dormant state, some functions of the transceiver 4 are activated by power, while other functions are deactivated. Moreover, upon receiving a second start signal within a certain period from the time the first start signal was received, the start signal generation / detection unit 42 fully activates the transceiver 4. Subsequently, the start signal generation / detection unit 42 fully activates the controller 3.

[0031] In sleep mode, transceiver 4 ceases communication layer processing and can only detect physical layer signals, unable to interpret data link layer or network layer messages. The first activation signal is a physical layer signal that triggers transceiver 4 from sleep mode to a state where it can interpret data link layer or network layer messages. For example, the first activation signal is a wake-up pulse (WUP) or wake-up request (WUR). WUP / WUR corresponds to the TC10 (Technical Committee 10) specification defined by the OPEN Alliance (One-Pair Ether-Net Alliance).

[0032] The second activation signal causes the transceiver 4 corresponding to the identification information to transition from a partially activated state to a fully activated state, thereby causing the controller 3 controlling the transceiver 4 to transition from a dormant state to a normal state. The second activation signal is a data link layer or network layer signal, including the identification information used to identify the transceiver 4 on the vehicle communication line 5.

[0033] For example, the second initiation signal is a Network Management (NM) message. NM messages are used in User Datagram Protocol Network Management (UDPNM). UDPNM is defined by the Automotive Open System Architecture (AUTOSAR), a global development collaboration program for the automotive industry.

[0034] Figure 4The data format of the NM message is shown below. The NM message includes an Ethernet header, IP header, UDP header, User Datagram Protocol Network Management Protocol Data Unit (UDPNMPDU), Ethernet padding field, and Ethernet Cyclic Redundancy Check (CRC) code. Identification information can be the node's MAC address or Virtual Local Area Network (VLAN) information contained in the Ethernet header. The MAC address is a unique identifier specific to each node's device. VLAN information, for example, is the VLAN ID, which is the identifier of the VLAN to which the node belongs. Alternatively, identification information can be the node's IP address contained in the IP header. Additionally, identification information can be Partial Network Information (PNI) contained in the UDPNMPDU. The PNI indicates whether a startup request is made for each partial network. An NM message containing a startup request for the partial network to which transceiver 4 belongs corresponds to identification information associated with transceiver 4.

[0035] In detail, the start signal generation / detection unit 42 has the functions of a transmission instruction setting unit 421, a transmission information setting / storage unit 422, a start signal generation unit 423, a transmission timer setting / storage unit 424, a transmission timer 425, a start signal detection unit 431, a detection notification unit 432, a detection information setting / storage unit 433, a detection timer setting / storage unit 434, and a detection timer 435.

[0036] The transmission instruction setting unit 421 receives the transmission instruction of the start signal from the controller 3 and provides the transmission instruction to the start signal generation unit 423. The transmission information setting / storage unit 422 sets and stores the mode information of the second start signal. For example, the transmission information setting / storage unit 422 sets the correspondence between the start factors of this node and the nodes started by this node as mode information.

[0037] The start signal generation unit 423 generates a first start signal based on a transmission instruction from the transmission instruction setting unit 421, and transmits the first start signal to the vehicle communication line 5 via the PCS 44 and PMA 45. Furthermore, the start signal generation unit 423 generates a second start signal based on the mode information of the second start signal stored in the transmission information setting / storage unit 422. For example, the start signal generation unit 423 generates the second start signal based on the start factors of this node included in the transmission instruction and the aforementioned correspondence.

[0038] The transmission timer setting / storage unit 424 sets and stores the transmission interval of the first start signal and the second start signal. The transmission interval can be the same in all nodes of the vehicle communication line 5, or it can be different depending on each VLAN or partial network. The transmission timer setting / storage unit 424 can update the transmission interval. The transmission timer 425 measures the transmission elapsed time from the time the first start signal was transmitted. Furthermore, when the transmission elapsed time reaches the stored transmission interval, the transmission timer 425 transmits the second start signal to the vehicle communication line 5 via the PCS 44 and PMA 45.

[0039] The start signal detection unit 431 detects standardized signals sent by other nodes to the vehicle communication line 5. The standardized signals include a first start signal and a second start signal. The detection notification unit 432 notifies the controller 3 that the first and second start signals have been detected by the start signal detection unit 431. The detection information setting / storage unit 433 sets and stores the mode information of the second start signal detected by the start signal detection unit 431.

[0040] The detection timer setting / storage unit 434 sets and stores the maximum reception interval for the first and second start signals. The reception interval can be the same across all nodes of the vehicle communication line 5, or it can vary depending on each VLAN or partial network. For example, the detection timer setting / storage unit 434 may set the reception interval for a specific VLAN to be longer than the transmission interval set in that specific VLAN. The detection timer setting / storage unit 434 can update the reception interval.

[0041] The detection timer 435 measures the elapsed reception time from the point when the first start signal is detected by the start signal detection unit 431. If the detection timer 435 receives a second start signal during the period from the elapsed reception time until the stored reception interval, it sends the second start signal to the start signal detection unit 431. If the detection timer 435 receives the second start signal after the elapsed reception time has exceeded the reception interval, it ignores the second start signal and does not send it to the start signal detection unit 431.

[0042] The start signal detection unit 431 detects the second start signal sent from the detection timer 435 and determines whether the identification information contained in the second start signal corresponds to this node. If the identification information corresponds to this node, the detection notification unit 432 notifies the controller 3 that a second start signal corresponding to this node has been detected.

[0043] Upon receiving notifications from transceiver 4 that a first start signal has been detected and a second start signal corresponding to this node has been detected, controller 3 transitions from sleep mode to normal mode. In sleep mode, only a portion of controller 3's functions are activated by power, while other functions are disabled. In normal mode, all functions of controller 3 are activated by power.

[0044] PCS44 encodes the transmission data received from the start signal generation / detection unit 42 to generate a transmission code, and sends the transmission code to PMA45. For example, PCS44 performs 4B / 3B conversion, scrambling, etc., on the transmission data to generate the transmission code. In addition, PCS44 decodes the receive code received from PMA45 to generate receive data, and sends the receive data to the start signal generation / detection unit 42.

[0045] The PMA45 converts the transmit code (i.e., bit data) received from the PCS44 into a physical layer signal (i.e., an electrical signal), and transmits the physical signal to the physical medium for transmission via the Medium Dependent Interface (MDI). The physical medium for transmission is equivalent to the Ethernet signal line constituting the vehicle communication line 5. Additionally, the PMA45 converts the physical layer signal (i.e., electrical signal) received from the physical medium for transmission via the MDI into a receive code (i.e., bit data), and transmits the receive code to the PCS44.

[0046] <1-2. Processing> <1-2-1. Startup Processing of Other Nodes Performed by the Transceiver in Startup State> Reference Figure 5 The process performed by transceiver 4 in the startup state to start other nodes is described. Transceiver 4 receives a startup signal instruction from controller 3 and begins this process.

[0047] In S10, transceiver 4 receives a start signal transmission instruction from controller 3. For example, controller 3 sends a start signal transmission instruction to transceiver 4 because of the application of this node, so as to start a specific node.

[0048] Next, in S20, transceiver 4 receives a start signal transmission instruction, generates a first start signal, and begins transmitting the first start signal. Additionally, transceiver 4 starts a transmission timer with the start of the first start signal transmission as the starting point.

[0049] Next, in S30, transceiver 4 determines whether the transmission timer has expired. That is, transceiver 4 determines whether the transmission timer has reached the stored transmission interval. If transceiver 4 determines that the transmission timer has expired, it enters the process of S40; if it determines that the transmission timer has not expired, it repeatedly executes the process of S30.

[0050] In step S40, transceiver 4 generates a second start signal and begins transmitting the second start signal. Afterward, transceiver 4 terminates this process.

[0051] <1-2-2. Startup process of this node performed by the transceiver in hibernation> Reference Figure 6 The startup process of this node executed by transceiver 4 in a dormant state is described. Transceiver 4 repeatedly executes this process at a predetermined period while in a dormant state.

[0052] In S100, transceiver 4 determines whether a first start signal has been detected. If transceiver 4 determines that a first start signal has been detected, it proceeds to process S110; if it determines that no first start signal has been detected, it repeats this process. In S110, transceiver 4 starts a detection timer starting from the time point when the first start signal is detected.

[0053] Next, in S120, transceiver 4 determines whether the detection timer has expired. That is, transceiver 4 determines whether the detection timer has reached the stored reception interval. If transceiver 4 determines that the detection timer has expired, it returns to the processing in S100. That is, transceiver 4 maintains a sleep state because it has not detected the second start signal within a certain period of time since the first start signal was detected. Alternatively, if transceiver 4 determines that the detection timer has not expired, it enters the processing in S130.

[0054] In S130, transceiver 4 determines whether a second start signal has been detected. If the transceiver 4 determines that a second start signal has been detected, it proceeds to the processing in S140; if it determines that no second start signal has been detected, it returns to the processing in S120.

[0055] In step S140, transceiver 4 transitions from a partially started state to a fully started state. Specifically, transceiver 4 energizes all power supply paths to its functional units. Additionally, transceiver 4 notifies controller 3 that the first and second start signals have been detected. Afterward, the process ends.

[0056] <1-3. Effects> According to the first embodiment described in detail above, the following effects are achieved.

[0057] (1) Transceiver 4 is fully activated if it detects a standardized second activation signal within a certain period of time from the detection of the standardized first activation signal. Therefore, transceiver 4 can be activated on a node-by-node basis based on the standardized signals on the vehicle communication line 5.

[0058] (2) The transceiver is able to detect the identification information contained in the second start signal based on the fact that the first start signal has been received. Furthermore, if the transceiver receives the second start signal within a certain period of time from the receipt of the first start signal, it can enable all functions to start.

[0059] (3) Transceiver 4 can start the transmission timer based on the fact that a signal corresponding to the TC10 specification has been received.

[0060] (4) Transceiver 4 can start all functions based on the fact that it has received an NM message using UDP as specified by AUTOSAR.

[0061] (5) Transceiver 4 can be fully started if the VLAN ID contained in the second start signal corresponds to itself.

[0062] (6) Transceiver 4 can be fully started if the PNI contained in the second start signal corresponds to itself.

[0063] (2. Second implementation method) <2-1. Differences from the first embodiment> Regarding the second embodiment, since its basic structure is the same as that of the first embodiment, the differences will be described below. Furthermore, the same reference numerals as in the first embodiment denote the same structures; please refer to the previous description.

[0064] In the aforementioned first embodiment, the transceiver 4 in the startup state generates and transmits a first startup signal and a second startup signal. In contrast, in the second embodiment, the difference from the first embodiment is that the transceiver 4 in the startup state generates and transmits the first startup signal, and the controller 3 in the startup state generates and transmits the second startup signal.

[0065] <2-2. Startup Processing of Other Nodes Performed by Transceivers and Controllers in the Startup State> Reference Figure 7 The process performed by transceiver 4 in the startup state to start other nodes is explained.

[0066] In S200, transceiver 4 receives the start signal transmission instruction in the same manner as in S10. Next, in S210, transceiver 4 generates a first start signal, begins transmitting the first start signal, and notifies controller 3 that the transmission of the first start signal has begun. Afterward, transceiver 4 terminates this process.

[0067] Next, refer to Figure 8 The process performed by controller 3 in the startup state to start other nodes is described. Controller 3 receives a notification from transceiver 4 that the transmission of the first startup signal has begun, and starts this process.

[0068] In S300, controller 3 starts the transmission timer, beginning with the transmission of the first start signal. Then, in S310, controller 3 determines whether the transmission timer has expired. If controller 3 determines that the transmission timer has expired, it proceeds to process S320; if it determines that the transmission timer has not expired, it repeatedly executes process S310.

[0069] In S320, controller 3 generates a second start signal and begins sending the second start signal. After that, controller 3 ends this process.

[0070] <2-3. Effects> According to the second embodiment detailed above, the effects of the first embodiment (1) to (6) mentioned above are achieved, and the following effects are also achieved.

[0071] (7) Since the controller 3 generates a second start signal, it can suppress the burden on the transceiver 4.

[0072] (Other implementation methods) The embodiments of this disclosure have been described above, but this disclosure is not limited to the above embodiments and can be implemented in various ways.

[0073] Multiple constituent elements can be used to achieve multiple functions of one constituent element in the above embodiments, or multiple constituent elements can be used to achieve one function of one constituent element. Alternatively, one constituent element can be used to achieve multiple functions of multiple constituent elements, or one constituent element can be used to achieve one function implemented by multiple constituent elements. Furthermore, a portion of the configuration of the above embodiments can be omitted. Additionally, at least a portion of the configuration of the above embodiments can be added to or replaced with other configurations of the above embodiments.

Claims

1. A transceiver connected to a vehicle-mounted communication line, characterized in that, The transceiver includes a detection unit configured to detect signals that have been standardized on the vehicle communication line. The transceiver is configured to fully activate if, within a certain period of time after the detection unit detects the first activation signal, it detects a second activation signal that is different from the first activation signal and includes identification information for identifying the transceiver on the vehicle communication line.

2. The transceiver according to claim 1, characterized in that, The first start signal partially activates the transceiver. The second start signal fully starts the transceiver.

3. The transceiver according to claim 1, characterized in that, The vehicle-mounted communication line is an Ethernet communication line. The first start signal is a wake-up pulse signal or wake-up request signal corresponding to the TC10 specification.

4. The transceiver according to claim 3, characterized in that, The second start signal is a User Datagram Network Management Packet as defined by the Automotive Open Systems Architecture.

5. The transceiver according to any one of claims 1 to 4, characterized in that, The identification information is virtual local area network (VLAN) identification information.

6. The transceiver according to any one of claims 1 to 4, characterized in that, The identification information is part of the network information.

7. A method for starting a transceiver, which is a method for starting a transceiver connected to a vehicle-mounted communication line, characterized in that, The first start signal, which has been standardized on the vehicle communication line, is detected. If a second activation signal, which is different from the first activation signal, is detected within a certain period of time from the detection of the first activation signal, is standardized on the vehicle communication line, and contains identification information of the network to which the transceiver belongs, the system is fully activated.

8. The transceiver startup method according to claim 7, characterized in that, Detecting the first start signal includes: the transceiver being partially started.

9. The transceiver startup method according to claim 7 or 8, characterized in that, The vehicle-mounted communication line is an Ethernet communication line. The first start signal is a wake-up pulse signal or wake-up request signal as specified in the TC10 standard.

10. The transceiver startup method according to claim 9, characterized in that, The second start signal is a User Datagram Network Management Packet as defined by the Automotive Open Systems Architecture.

11. A communication system comprising a transmitting device, a receiving device, and a control device connected to a vehicle-mounted communication line, characterized in that, The transmitting device is configured to generate and transmit a first start signal that is standardized on the vehicle communication line. The receiving device is configured to receive standardized signals on the vehicle-mounted communication line. The control device is configured to fully activate itself within a certain period of time after receiving the first activation signal from the receiving device, if the receiving device receives a second activation signal that is different from the first activation signal and includes identification information for identifying the receiving device on the vehicle communication line.

12. The communication system according to claim 11, characterized in that, The receiving device is configured to partially start upon receiving the first start signal and fully start upon receiving the second start signal.

13. The communication system according to claim 11 or 12, characterized in that, The vehicle-mounted communication line is an Ethernet communication line. The first start signal is a wake-up pulse signal or wake-up request signal as specified in the TC10 standard.

14. The communication system according to claim 13, characterized in that, The second start signal is a User Datagram Network Management Packet as defined by the Automotive Open Systems Architecture.

15. A communication system comprising a transmitting device, a receiving device, a first control device, and a second control device connected to a vehicle-mounted communication line, characterized in that, The transmitting device is configured to generate and transmit a first start signal that is standardized on the vehicle communication line. The first control device is configured to, after sending the first start signal to the vehicle communication line, generate a second start signal that is standardized on the vehicle communication line and includes identification information for identifying the receiving device on the vehicle communication line, and then send the second start signal. The receiving device is configured to receive standardized signals on the vehicle-mounted communication line. The second control device is configured to fully activate when the receiving device receives the second activation signal within a certain period of time after receiving the first activation signal.

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