WO2021196931A1 - Procédé, appareil et système de communication pour système de communication de ligne électrique - Google Patents

Procédé, appareil et système de communication pour système de communication de ligne électrique Download PDF

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Publication number
WO2021196931A1
WO2021196931A1 PCT/CN2021/077848 CN2021077848W WO2021196931A1 WO 2021196931 A1 WO2021196931 A1 WO 2021196931A1 CN 2021077848 W CN2021077848 W CN 2021077848W WO 2021196931 A1 WO2021196931 A1 WO 2021196931A1
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Prior art keywords
frame
data
header
type
data frame
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PCT/CN2021/077848
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English (en)
Chinese (zh)
Inventor
谢志鹏
曾焱
蔡文超
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华为技术有限公司
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Publication of WO2021196931A1 publication Critical patent/WO2021196931A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits

Definitions

  • This application relates to the field of communication, and in particular to a communication method, device and system for a power line communication system.
  • a power line communication (PLC) system can adopt a half-duplex communication method, and the half-duplex communication method requires two different transmission time slots for signal transmission in two different transmission directions. For example, in the first time slot, the first end sends a signal to the second end, and the second end receives the signal; in the second time slot, the second end sends a signal to the first end, and the first end receives the signal. Therefore, the communication capacity of the half-duplex communication mode is relatively low.
  • the PLC system can also use a full-duplex communication system.
  • the full-duplex communication system refers to the two-way simultaneous communication between the first end and the second end, that is, in the same time slot, the first end sends a signal to the second end, and the second end also sends a signal to the first end, so Theoretically, the communication capacity of a full-duplex communication system is higher than that of a half-duplex communication system.
  • PLC systems are widely used in home networks or power line monitoring and other fields. With the development of business in these fields, the demand for communication capacity is increasing. Therefore, the current PLC communication capacity is still insufficient, and its communication capacity needs to be improved.
  • This application provides a communication method, device, and system for a power line communication system to improve communication capacity.
  • the technical solution is as follows:
  • the embodiments of the present application provide a new type of data frame used for transmission in a PLC system.
  • the frame header of the new type data frame does not include the response frame header, which can reduce the length of the frame header of the new type data frame.
  • the frame header length of the new data frame is smaller than the frame header length of the traditional data frame.
  • the embodiment of the present application defines the frame type of the new data frame as the first frame type, and the frame type of the traditional data frame as the second frame type, and the first frame type and the second frame type are different.
  • an embodiment of the present application provides a communication method for a PLC system.
  • a first device receives a first data frame sent by a second device, and the first data frame includes M data units, M is an integer greater than zero.
  • the first device determines whether there is an error in the M data units, and if it is determined that none of the M data units has an error, it sends a second data frame to the second device.
  • the frame type of the second data frame is The first frame type, the frame header of the second data frame does not include the response frame header.
  • the second data frame is used to indicate that none of the M data units has an error.
  • the first device responds to the second device through the second data frame.
  • the frame header of the second data frame does not include the response frame header, the length of the payload part of the second data frame is increased, thereby increasing the communication capacity.
  • the length of the second data frame can be reduced to reduce the time required to transmit the second data frame, so that in the same data transmission time period, the number of transmission data frames can be increased to increase the communication capacity.
  • the first device sends a third data frame to the second device when it is determined that there are errors in N data units in the M data units, where N is greater than 0 and less than or equal to M
  • the frame type of the third data frame is the second frame type
  • the second frame type is different from the first frame type
  • the frame header of the third data frame includes the response frame header
  • the response frame header includes the first indication information and At least one of the second indication information
  • the first indication information is used to indicate that the N data units have errors
  • the second indication information is used to indicate that MN data units have no errors
  • the MN data units are the M data units Data units other than the N data units in the data unit.
  • the frame header of the second data frame includes a first preamble and a first management information frame header
  • the frame header of the third data frame also includes a second preamble and a second management information frame header.
  • the header of the second data frame does not include the response header, so that the length of the header of the second data frame or the time length of the entire second data frame can be reduced.
  • the second preamble and the second management information frame header are located before the response frame header.
  • the second data frame includes frame type indication information, and the frame type indication information is used to indicate that the frame type of the second data frame is the first frame type. This is convenient for the second device to determine the frame type of the second data frame when receiving the second data frame.
  • the frame type indication information is carried in the first management information frame header of the second data frame, so that the frame type indication information is transmitted to the second device through the first management information frame header, So that the second device can determine the frame type of the second data frame.
  • the second data frame includes additional channel estimation (ACE), and the ACE is located after the frame header of the second data frame.
  • ACE channel estimation
  • the first preamble, the first management information frame header, and the ACE correspond to different orthogonal frequency division multiplexing (OFDM) symbols.
  • the second preamble, the second management information frame header and the response frame header respectively correspond to different OFDM symbols.
  • the first device receives the first data frame in the first data transmission time slot, the first device transmits the second data frame or the third data frame in the second data transmission time slot, and the second data The transmission time slot is located after the first data transmission time slot.
  • an embodiment of the present application provides a communication method for a PLC system.
  • a first data frame sent by a second device to a first device the first data frame includes M data units, M is an integer greater than zero.
  • the first device determines whether the M data units have error data units, and when it is determined that none of the M data units have errors, it sends the first frame type of the second device to the second device.
  • Two data frames, the second data frame is used to indicate that none of the M data units received by the first device has an error, and the second data frame does not include the response frame header.
  • the second device receives the second data frame sent by the first device, determines the frame type of the second data frame, and when determining that the frame type of the second data frame is the first frame type, determines that none of the M data units has an error. In this way, the M data units are responded to by the second data frame, and since the second data frame does not include the response frame header, the length of the payload part of the second data frame is increased, thereby increasing the communication capacity.
  • the length of the second data frame can be reduced to reduce the time required to transmit the second data frame, so that in the same data transmission time period, the number of transmission data frames can be increased to increase the communication capacity.
  • the first device sends a second data frame of the second frame type to the first device when it is determined that there are errors in N data units among the M data units, and the second data
  • the frame header of the frame includes a response frame header.
  • the first frame type is different from the second frame type.
  • the response frame header includes at least one of first indication information and second indication information.
  • the first indication information is used to instruct the first device Among the received M data units, there are N data units that have errors.
  • the second indication information is used to indicate that MN data units have no errors.
  • N is an integer greater than 0 and less than or equal to M.
  • the MN data units are the Data units other than the N data units among the M data units.
  • the second device receives the second data frame, and when determining that the frame type of the second data frame is the second frame type, based on the response header of the second data frame, it determines the N data units and/or failures that have errors.
  • the frame header of the second data frame when the frame type of the second data frame is the first frame type, the frame header of the second data frame includes the first preamble and the first management information frame header; When the frame type is the second frame type, the frame header of the second data frame further includes a second preamble and a second management information frame header, and the second preamble and the second management information frame header are located before the response frame header.
  • the frame type of the second data frame is the first frame type
  • since the header of the second data frame does not include the response header, the length of the header of the second data frame can be reduced, and the payload of the second data frame can be increased. The length of the part or reduce the time length of the second data frame.
  • the second data frame includes frame type indication information
  • the frame type indication information is used to indicate the frame type of the second data frame, so that the second device can determine the second data frame according to the frame type indication information.
  • the frame type of the data frame improves the accuracy of determining the frame type.
  • the second device parses the second data frame, and if the second data frame does not include the response frame header, it determines that the frame type of the second data frame is the first frame type; if the second data frame If the response frame header is included, the frame type of the second data frame is determined to be the second frame type, and thus the frame type of the second data frame is determined.
  • the second data frame includes an ACE, and the ACE is located after the frame header of the second data frame.
  • the first preamble and the first management information frame header in the second data frame correspond to different OFDM symbols;
  • the frame type of the second data frame is the second frame type, the second preamble, the second management information frame header, and the response frame header in the second data frame respectively correspond to different OFDM symbols.
  • the second device parses the next OFDM symbol adjacent to the header of the first management information frame in the second data frame, and if the next OFDM symbol is the ACE, it determines the second data frame Does not include the response frame header. In this way, a way of analyzing whether the second data frame includes the response frame header is realized.
  • this application provides a communication device for a PLC system, which is used to execute the first aspect or the method in any one of the possible implementation manners of the first aspect.
  • the device includes a unit for executing the method of the first aspect or any one of the possible implementation manners of the first aspect.
  • the present application provides a communication device for a PLC system, which is used to execute the second aspect or the method in any one of the possible implementation manners of the second aspect.
  • the device includes a unit for executing the second aspect or any one of the possible implementation manners of the second aspect.
  • the present application provides a communication device for a PLC system, the device includes: a processor, a memory, and a transceiver. Wherein, the processor, the memory and the transceiver may be connected through a bus system.
  • the memory is configured to store one or more programs
  • the processor is configured to execute one or more programs in the memory, so that the communication device completes the first aspect or the method in any possible implementation manner of the first aspect .
  • the present application provides a communication device for a PLC system, the device including: a processor, a memory, and a transceiver.
  • the processor, the memory and the transceiver may be connected through a bus system.
  • the memory is configured to store one or more programs
  • the processor is configured to execute one or more programs in the memory, so that the communication device completes the second aspect or the method in any possible implementation manner of the second aspect .
  • the present application provides a computer-readable storage medium with program code stored in the computer-readable storage medium, which when run on a computer, causes the computer to execute the first, second, and first aspects above Any possible implementation manner of or a method in any possible implementation manner of the second aspect.
  • the present application provides a computer program product containing program code, which when running on a computer, enables the computer to execute the first aspect, the second aspect, any possible implementation manner of the first aspect, or the second aspect Any of the possible implementations of the method.
  • the present application provides a communication system for a PLC system.
  • the communication system includes the device described in the third aspect and the device described in the fourth aspect, or the communication system includes the device described in the fifth aspect.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the structure of a data frame provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the structure of a signal frame provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of an aggregation frame provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a PLC system provided by an embodiment of the present application.
  • FIG. 6 is a flowchart of a communication method for a PLC system provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of responding to a data frame provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a constellation diagram provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a second data frame provided by an embodiment of the present application.
  • FIG. 10 is another schematic diagram of responding to a data frame provided by an embodiment of the present application.
  • FIG. 11 is another schematic diagram of responding to a data frame provided by an embodiment of the present application.
  • FIG. 12 is a flowchart of another communication method for a PLC system provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a third data frame provided by an embodiment of the present application.
  • FIG. 14 is another schematic diagram of responding to a data frame provided by an embodiment of the present application.
  • FIG. 15 is a schematic structural diagram of a communication device used in a PLC system provided by an embodiment of the present application.
  • 16 is a schematic structural diagram of another communication device used in a PLC system provided by an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of another communication device used in a PLC system provided by an embodiment of the present application.
  • FIG. 18 is a schematic structural diagram of another communication device used in a PLC system provided by an embodiment of the present application.
  • an embodiment of the present application provides a PLC system, including a first device and a second device.
  • the first device and the second device communicate in a full-duplex communication mode.
  • the first device and the second device When using full-duplex communication, the first device and the second device perform two-way simultaneous communication. In the same data transmission time slot, the first device sends data frames to the second device, and the second device also sends data frames to the first device. Data Frame. For example, as shown in Figure 1, the first device sends data frame 1 to the second device and simultaneously receives data frame 2 sent by the second device in a data transmission time gap. Similarly, the second device sends data frame 1 to the first device in the data transmission time gap. The device sends data frame 2 and simultaneously receives data frame 1 sent by the first device.
  • the data frame includes a frame header, additional channel estimation (ACE), and a payload part.
  • the ACE is located between the frame header and the payload part.
  • the payload part includes at least one data unit (M data units as shown in FIG. 2, where M is an integer greater than 0).
  • the ACE includes information for channel estimation.
  • the channel is between the first device and the second device.
  • ACE also has a pilot function.
  • the data unit is a link protocol data unit (logical link control protocol data unit, LPDU), etc.
  • link protocol data unit logical link control protocol data unit, LPDU
  • the first device and the second device both send and receive data frames in data transmission time slots, and two adjacent data transmission time slots are separated by an inter-frame protection gap.
  • the data frame sent by the first device to the second device in the first data transmission time slot is a signal frame
  • the data frame sent by the second device to the first device is also For the signal frame.
  • the data frame sent by the first device to the second device in the data transmission time slot may be an aggregated frame
  • the second device also sends to the first device
  • the data frame may also be an aggregated frame.
  • a signal frame includes a frame header, an ACE, and a payload part.
  • the ACE is located between the frame header and the payload part.
  • the frame header of the signal frame includes a preamble and a management information frame header, and the management information frame header is located between the preamble and the ACE.
  • the preamble in the signal frame is used to implement at least one function of data synchronization, automatic gain control (AGC) adjustment, and frequency offset correction.
  • the management information frame header of the signal frame includes the management information of the signal frame, and the management information includes information such as a source address, a destination address, and a frame header check sequence.
  • the ACE includes information used for channel estimation, and the payload part includes at least one data unit.
  • the aggregate frame transmitted in the data transmission slot includes a frame header, an ACE and a payload part.
  • the ACE is located between the frame header and the payload part.
  • the frame header of the signal frame includes a preamble, a management information frame header, and a response frame header.
  • the management information frame header is located between the preamble and the response frame header, and the response frame header is located before the ACE.
  • the preamble in the aggregation frame is used to implement at least one function of data synchronization, AGC adjustment, and frequency offset correction.
  • the management information frame header of the aggregate frame includes the management information of the aggregate frame, and the management information includes information such as a source address, a destination address, and a frame header check sequence.
  • the response frame header of the aggregation frame carries at least one of the first indication information and the second indication information, the ACE includes information used for channel estimation, and the payload part includes at least one data unit.
  • the first device receives the data frame sent by the second device in the first data transmission time slot.
  • the data frame includes M data units.
  • the first device sends the aggregate frame to the second device in the second data transmission time slot.
  • the data transmission time slot is located after the first data transmission time slot, and the response frame header included in the frame header of the aggregation frame carries at least one of the first indication information and the second indication information, and the first indication information is used to indicate the M
  • the data unit in which an error occurs in the data units, and the second indication information is used to indicate the data unit in the M data units that does not have an error.
  • the data frame received by the first device in the first data transmission time slot is sent by the second device in the first data transmission time slot
  • the first data transmission time slot is a data transmission time slot located after the first data transmission time slot
  • the data frame received by the first device in the first data transmission time slot is the data frame received by the second device in the first data transmission time slot The aggregated frame sent in the first data transmission slot.
  • the length of the header of the aggregate frame described above is relatively long, which may reduce the length of the payload part, thereby reducing the communication capacity of the full-duplex communication system.
  • the present application provides a new type of aggregated frame. In the case that none of the M data units included in the first data frame received by the first device in the first data transmission slot has an error, the first device The new type of aggregation frame can be sent in the second data transmission time slot, and the new type of aggregation frame is used to indicate that no error has occurred in the M data units.
  • the novel aggregate frame includes a frame header, an ACE, and a payload part, and the ACE is located between the frame header and the payload part.
  • the frame header includes a preamble and a management information frame header, the management information frame header is located between the preamble and the ACE, and the ACE is located after the management information frame header.
  • the preamble in the new aggregation frame is used to implement at least one function such as data synchronization, AGC adjustment, and frequency offset correction.
  • the management information frame header includes management information of the new aggregate frame.
  • the management information includes frame type indication information, and the frame type indication information is used to indicate the frame type of the new aggregate frame.
  • the ACE includes information used for channel estimation, and the payload part includes at least one data unit (X data units as shown in FIG. 4, where X is an integer greater than 0).
  • the frame header of the new aggregate frame does not include the response frame header, which can increase the length of the payload part, so that the net of the new aggregate frame can be increased.
  • the number of data units included in the payload part is greater than or equal to the number of data units included in the payload part of the traditional aggregate frame, thereby achieving the improvement of the communication capacity of the full-duplex communication system.
  • reduce the length of the new aggregate frame to reduce the time required to transmit the new aggregate frame, so that in the same data transmission time period, the number of new aggregate frames to be transmitted can be increased to increase the communication capacity.
  • the length of time occupied by the response frame header is 51.2 microseconds (us).
  • the new aggregate frame reduces the response frame header, which can reduce the length of time occupied by the new aggregate frame by 51.2us.
  • the communication method can transmit new aggregated frames in both directions at the same time, so that each pair of new aggregated frames for two-way communication can reduce the time accumulated by 0.14 milliseconds (ms).
  • the frame type of the new aggregate frame is referred to as the first frame type
  • the frame type of the traditional aggregate frame that is, the aggregate frame including the response frame header
  • the second frame type the frame type of the traditional aggregate frame (that is, the aggregate frame including the response frame header) shown in FIG. 2
  • the second frame type the frame type of the traditional aggregate frame (that is, the aggregate frame including the response frame header) shown in FIG. 2
  • the first device after receiving the first data frame sent by the second device, the first device sends the frame type of the first frame to the second device if it is determined that none of the M data units in the first data frame has an error.
  • Type of the second data frame the second data frame is used to indicate that none of the M data units have errors, and the second data frame is a new type of aggregation frame; it is determined that there are N data units that have errors in the M data units
  • a third data frame of the second frame type is sent to the second device, and the frame header of the third data frame includes a response frame header, and the response frame header includes at least one of the first indication information and the second indication information.
  • One indication information is used to indicate that N data units have errors
  • the second indication information is used to indicate that the remaining MN data units have no errors
  • N is an integer less than 0 and less than or equal to M
  • the third data frame is a traditional Aggregate frame.
  • the PLC system includes a domain master (DM) and multiple nodes (end ponit, EP), and the DM may be connected to the multiple EPs through PLC power lines.
  • the first device and the second device can be the DM and any EP respectively, and the DM and any EP use full-duplex communication to communicate.
  • the specific implementation will be carried out in the subsequent embodiments shown in Figure 6 and Figure 12 illustrate.
  • the DM allocates a data transmission time period that includes at least one data transmission time slot, and then the DM and the EP communicate in a full-duplex communication mode during the data transmission time period.
  • the first device and the second device are any two EPs in the PLC communication system, and the two EPs use full-duplex communication for communication.
  • the specific implementation will be implemented as shown in Figure 6 and Figure 12 later. Examples are explained in detail.
  • the data transmission time period includes at least one data transmission time. Then, during the data transmission time period, the two EPs communicate using the full-duplex communication mode.
  • an embodiment of the present application provides a communication method for a PLC system.
  • the method is applied to the network architecture shown in FIG. 1 or FIG. 5.
  • the first device and the second device adopt full-duplex communication.
  • the first device can receive the data frame sent by the second device and can also send the data frame to the second device in the same data transmission time slot.
  • the first device receives the data frame sent by the second device in the first data transmission time slot, and sends the data frame to the second device in the second data transmission time slot as an example.
  • the second data transmission time slot Located after the first data transmission slot.
  • the method includes:
  • Step 101 A first device receives a first data frame sent by a second device, where the first data frame includes M data units, and M is an integer greater than zero.
  • the first device and the second device communicate in full-duplex communication mode.
  • the first device and the second device Before adopting the full-duplex communication mode, the first device and the second device first apply for a data transmission time period, and the data transmission time period includes at least For a data transmission time slot, there is an inter-frame protection gap between two adjacent data transmission time slots.
  • the first device and the second device are respectively the DM and EP of the PLC system.
  • the DM allocates a data transmission time period, and then uses full duplex in the data transmission time slot included in the data transmission time period. Communicate with EP in industrial communication mode.
  • the first device and the second device are respectively two EPs of the PLC system. Before the two EPs or one of the two EPs communicate, they request the DM to allocate a data transmission time period, and then the two EPs The EP uses a full-duplex communication mode to communicate within the data transmission time slot included in the data transmission time period.
  • the first device receives the first data frame sent by the second device in the first data transmission time slot.
  • the first data frame includes a frame header, an ACE, and a payload part, and the payload part includes the M data units.
  • the first data transmission time slot may be the first data transmission time slot in the data transmission time period, so that the first data frame is a signal frame sent by the second device in the first data transmission time slot.
  • the first data transmission time slot may be a data transmission time slot located after the first data transmission time slot, so that the first data frame is an aggregate frame sent by the second device in the first data transmission time slot.
  • a data frame may be a new aggregate frame of the first frame type, or may be a traditional aggregate frame of the second frame type.
  • the second device After the second device sends the first data frame, the second device sets the state of the M data units in the first data frame to the waiting state.
  • the first data frame is an aggregate frame (may be a new type aggregate frame of the first frame type, or may be a traditional aggregate frame of the second frame type)
  • the second device sends the first data frame after Set the status of the M data units (data units 21, 22, ..., 2M in FIG. 8) to be acknowledged, and for the data units sent before the first data transmission time slot (data units in FIG.
  • Step 102 The first device determines whether there are data units with errors in the M data units. If it is determined that none of the M data units have errors, then step 103 is executed. If it is determined that there are N data units in the M data units If an error occurs in the unit, step 105 is executed, where N is an integer greater than 0 and less than or equal to M.
  • the first device obtains the M data units from the first data frame. For any data unit of the M data units, the first device decodes the data unit, and decodes the data in the data unit and the bit error rate of the data unit, where the bit error rate exceeds the bit error rate threshold , It is determined that an error has occurred in the data unit, and when the error rate does not exceed the error rate threshold, it is determined that no error has occurred in the data unit.
  • the second device When the second device sends the data unit, it maps the data in the data unit to each constellation point included in the constellation diagram. For example, referring to FIG. 8, the second device maps the data in the data unit to the four constellation points A, B, C, and D included in the constellation diagram shown in FIG. 8.
  • the position of the constellation point in the constellation diagram changes. For example, referring to FIG. 8, in the process of transmitting the data unit, the position of the constellation point A may shift and move to the position of the constellation point A1, causing an error in the data unit.
  • the first device and the second device may agree on each constellation point in the constellation diagram in advance, so that both the first device and the second device save the position of each constellation point in the constellation diagram, or the first device and the second device use
  • the communication protocol defines each constellation point in the constellation diagram, so that both the first device and the second device save the position of each constellation point in the constellation diagram. Since the position of each constellation point in the constellation diagram is stored in the first device, when the constellation diagram of the data unit is decoded, it is detected that the position of the constellation point A1 is wrong, and an error occurs in the constellation point A1.
  • the first device detects each constellation point where errors occur in the constellation diagram of the data unit, and calculates the bit error rate of the data unit based on the number of constellation points where the error occurs and the total number of constellation points included in the constellation diagram.
  • Step 103 The first device sends a second data frame to the second device, where the second data frame is used to indicate that none of the M data units has an error.
  • the first device determines that none of the M data units has an error, it generates a second data frame.
  • the second data frame is a new type of aggregation frame of the first frame type and sends it to the second device in the second data transmission time slot.
  • the second data frame is a new type of aggregation frame of the first frame type and sends it to the second device in the second data transmission time slot.
  • the second data frame includes a frame header, a first ACE and a first payload part.
  • the frame header includes a first preamble and a first management information frame header.
  • the first preamble is located before the first management information frame header.
  • a management information frame header is located before the first ACE, the first ACE is located before the first payload part, and the first payload part includes X data units.
  • the first preamble, the first management information frame header, and the first ACE respectively correspond to different (orthogonal frequency division multiplexing, OFDM) symbols, that is, different OFDM symbols are used to transmit the first preamble, the first management information frame header, and the first ACE.
  • OFDM orthogonal frequency division multiplexing
  • the first payload part is also for at least one OFDM symbol, that is, the at least one OFDM symbol is used to transmit the first payload part.
  • the first management information frame header includes frame type indication information, and the frame type indication information is used to indicate that the frame type of the second data frame is the first frame type.
  • a reserved field in the first management information frame header is used to carry the frame type indication information.
  • At least one bit in the reserved field is used to carry the frame type indication information. For example, setting the value of a bit in the reserved field to 1 indicates that the frame type indicated by the frame type indication information is the first frame type, or setting the value of a bit in the reserved field to 0 indicates that the frame type The frame type indicated by the indication information is the first frame type.
  • the first device and the second device can agree on a bit used to carry the frame type indication information in the reserved field in the second data frame before communicating.
  • the communication protocol used by the first device and the second device specifies the bits used to carry the frame type indication information in the reserved field in the second data frame.
  • the first device when the first device generates the second data frame, it uses the agreed bits in the reserved field to carry the frame type indication information, or uses the bits in the reserved field specified by the communication protocol to carry the frame type indication information.
  • the first device After the first device sends the second data frame, it sets the state of the X data units in the second data frame to the waiting state.
  • Step 104 The second device receives the second data frame, obtains the frame type of the second data frame, and determines that the frame type of the second data frame is the first frame type, thereby further determining the M data units received by the first device No error occurred, the end returns.
  • the frame type of the second data frame can be determined in the following two ways:
  • the second device obtains the frame type indication information from the frame header of the second data frame, and determines that the frame type of the second data frame is the first frame type according to the frame type indication information.
  • the frame header of the second data frame includes a first management information frame header, and the first management information frame header includes frame type indication information, and the frame type indication information is used to indicate that the frame type of the second data frame is the first frame type. Therefore, the second device recognizes the first management information frame header from the frame header of the second data frame, reads the frame type indication information from the first management information frame header, and determines the second data frame according to the frame type indication information
  • the frame type is the first frame type.
  • the frame type indication information is carried in a reserved field of the first management information frame header.
  • the second device may read the frame type indication information from the reserved field of the information frame header of the first management frame.
  • the first device and the second device agree in advance to reserve at least one bit for carrying the frame type indication information in the reserved field, so that the second device reads the frame type indication information from the agreed at least one bit.
  • the communication protocol used by the second device and the first device specifies at least one bit used to carry the frame type indication information in the reserved field, so that the second device determines the frame type in the second data frame based on the communication protocol. At least one bit, read the frame type indication information from the at least one bit.
  • the second device detects the second data frame, and if it detects that the second data frame does not include the response frame header, it determines that the frame type of the second data frame is the first frame type.
  • the second data frame includes the first ACE, the frame header of the second data frame includes the first frame management information frame header, and the first ACE is located after the frame header of the second data frame; in this way, the second device detects the operation of the second data frame, Can be:
  • the second device detects the next field adjacent to the management information frame header of the first frame in the second data frame, and detects that the next field is the first ACE, and then detects that the second data frame does not include the response frame header.
  • the second device when the second device determines that the frame type of the second data frame is the first frame type after executing the above-mentioned first method, it may further determine whether the frame type of the second data frame is the second method
  • the first frame type is used to improve the accuracy of determining the frame type of the second data frame.
  • the frame type information carried in the header of the first frame management information of the second data frame may be wrong, so the second device The frame type of the second data frame determined through the first method may be inaccurate. Therefore, the second device can further determine the frame type of the second data frame through the second method. If the second data frame is determined through two methods The frame types of are all the first frame type, so that the frame type of the second data frame is finally determined to be the first frame type.
  • the second device in the second data transmission time slot, the second device also sends a fourth data frame to the first device, and the payload part of the fourth data frame includes W data units (as shown in Figure 10).
  • W data units as shown in Figure 10
  • Units 31, 32, ..., 3W set the state of the W data units to the waiting state, and the W data units are located behind the M data units.
  • the second device determines that none of the M data units received by the first device has an error, it sets the state of the M data units to acknowledged, moves the sliding window, and sets the starting position of the sliding window After moving to the M data units and before the W data units, W can be equal to, greater than, or less than M.
  • the second data frame includes X data units
  • the second device also determines whether there are data units with errors in the X data units, and sends the data frame to the first device in the third data transmission time slot according to the determined result,
  • steps 102 and 103 and the operation performed by the first device in the subsequent step 105, which is not described in detail here.
  • the first device determines that there are N data units in the M data units, the first device starts to perform the following operation of step 105 after performing the operation of step 102.
  • Step 105 The first device sends a third data frame to the second device.
  • the frame header of the third data frame includes a response frame header.
  • the response frame header includes at least one of the first indication information and the second indication information.
  • the information is used to indicate that an error has occurred in the N data units
  • the second indication information is used to indicate that no error has occurred in the MN data units
  • the MN data units are data units other than the N data units among the M data units .
  • the first device generates a third data frame when it is determined that there are errors in the N data units of the M data units.
  • the third data frame is a traditional aggregate frame of the second frame type, and transmits to the first data frame in the second data transmission time slot.
  • the second device sends the third data frame.
  • the third data frame includes a frame header, a second ACE, and a second payload part.
  • the frame header includes a second preamble, a second management information frame header, and a response frame header.
  • the second preamble is located in the second management information frame.
  • the second management information frame header is located before the response frame header
  • the response frame header is located before the second ACE
  • the second ACE is located before the second payload part
  • the second payload part includes Y data units.
  • the second preamble, the second management information frame header, the response frame header, and the second ACE respectively correspond to different OFDM symbols, that is, different OFDM symbols are used to transmit the second preamble, the second management information frame header, and the response frame header.
  • the second ACE The second payload part is also for at least two OFDM symbols, that is, the at least one OFDM symbol is used to transmit the second payload part.
  • the response frame header includes a bitmap
  • the bitmap includes M bits
  • the first to Mth bits correspond to the first to Mth data units, and for data units that have no errors, the data unit corresponds to
  • the value of the bit of is the first value
  • the second value is the value 0; alternatively, the first value is the value 1, and the second value is the value 0.
  • the bitmap there are M-N bits whose values are the first value, and there are N bits whose values are the second value.
  • the first indication information includes the bit corresponding to the data unit in the bitmap with an error
  • the second indication information includes the bit corresponding to the data unit with no error in the bitmap.
  • the first indication information includes the sequence numbers of the N data units
  • the second indication information includes the sequence numbers of the M-N data units.
  • the frame header length of the second data frame is smaller than the frame header length of the third data frame. This may cause the length of the first payload part of the second data frame to be greater than or equal to the length of the second payload part of the third data frame, so the number of data units X in the second data frame may be greater than or equal to the third data frame The number of data units in Y.
  • the length of the first payload part of the second data frame is equal to the length of the second payload part of the third data frame, which results in the time length of the second data frame being shorter than the time length of the third data frame.
  • Step 106 The second device receives the third data frame, determines the N data units with errors and/or the M-N data units without errors based on the response frame header of the third data frame, and ends the return.
  • the second device recognizes the response frame header from the third data frame.
  • the response frame header includes the first indication information
  • extract the first indication information from the response frame header and based on the first indication information, determine the N data units where errors have occurred, and further obtain the MN where no error has occurred. Data units.
  • the second indication information is extracted from the response frame header, and based on the second indication information, M-N data units where no error has occurred are determined.
  • M-N data units where no error has occurred are determined.
  • N data units in which the error occurred can also be determined.
  • the response frame header includes the first indication information and the second indication information
  • extract the first indication information and the second indication information from the response frame header determine the N data units with errors based on the first indication information, and Based on the first indication information, determine MN data units where no error has occurred.
  • the response frame header includes a bitmap
  • the second device obtains from the bitmap N bits with a value of the second value and MN bits with a value of the first value, and determines the N bits The corresponding N data units have errors, and it is determined that the MN data units corresponding to the MN data units have no errors.
  • the first indication information includes the sequence numbers of the N data units where the error occurs
  • the second device determines the N data units where the error occurs according to the sequence numbers of the N data units.
  • the second indication information includes the sequence number of the M-N data unit that has no error, and the second device determines the M-N data unit that has no error according to the sequence number of the M-N data unit.
  • the second device determines Z data units from the MN data units, where Z is an integer greater than or equal to 0 and less than or equal to MN, and the Z data units are also the first Z of the M data units Data unit, set the state of the Z data units to the acknowledged state. For the remaining M-Z data units, they will be re-sent to the first device in the data transmission time slot after the second data transmission time slot.
  • the second device in the second data transmission time slot, the second device also sends a fourth data frame to the first device.
  • the payload part of the fourth data frame includes W data units (as shown in Figure 10).
  • Units 31, 32, ..., 3M) set the state of the W data units to the waiting state, and the W data units are located behind the M data units.
  • the second device determines the N data units with errors and MN data units with no errors, it is assumed that the MN data units with no errors are the first data unit and the second data unit among the M data units.
  • the data unit, the 4th data unit and the 6th data unit so that the second device determines 2 data units from the four data units where no error has occurred, and the 2 data units are the first two of the M data units Data unit, namely the first data unit and the second data unit.
  • the second device sets the status of the two data units as acknowledged, moves the sliding window, and moves the starting position of the sliding window to the second data unit of the M data units (ie, FIG. 14 Between the data unit 22 shown) and the third data unit (not shown in FIG. 14).
  • the third data frame includes Y data units
  • the second device also determines whether there are data units with errors in the Y data units, and sends the data frame to the first device in the third data transmission time slot according to the determined result
  • the fourth data frame sent by the first device to the second device may be a new type of aggregation frame of the first frame type, or may be a traditional aggregation frame of the second frame type, and it is sent
  • the operations performed by the first device in the foregoing steps 102, 103, and 105 which are not described in detail in the embodiment of the present application.
  • the first device when the first device receives the first data frame, it determines whether there is an error-occurring data unit among the M data units in the first data frame. If it is determined that none of the M data units has occurred If an error occurs, a second data frame of the first frame type is sent to the second device, and the second data frame is used to indicate that no error has occurred in the M data units. In this way, the second device receives the second data frame, and when it detects that the frame type of the second data frame is the first frame type, it is determined that the M data units received by the first device have no errors.
  • the length of the frame header of the second data frame can be reduced, so that the length of the payload part of the second data frame can be increased, thereby increasing the communication capacity.
  • the length of the second data frame can be reduced to reduce the time required to transmit the second data frame, so that in the same data transmission time period, the number of transmission data frames can be increased to increase the communication capacity.
  • an embodiment of the present application provides a communication device 200 for a PLC system.
  • the device 200 may be deployed in the first device shown in any of the foregoing embodiments, and includes: a receiving unit 201 and a processing unit 202 And sending unit 203;
  • the receiving unit 201 is configured to receive a first data frame sent by a second device, the first data frame includes M data units, and M is an integer greater than 0;
  • the sending unit 203 is configured to send a second data frame to the second device when the processing unit 202 determines that none of the M data units has an error, the frame type of the second data frame is the first frame type, and the second data frame The frame header of the frame does not include the response frame header, and the second data frame is used to indicate that none of the M data units has an error.
  • the sending unit 203 is further configured to:
  • the processing unit 202 determines that there are errors in N data units among the M data units, it sends a third data frame to the second device, where N is an integer greater than 0 and less than or equal to M, and the frame of the third data frame
  • the type is the second frame type, the second frame type is different from the first frame type, the frame header of the third data frame includes a response frame header, and the response frame header includes at least one of the first indication information and the second indication information,
  • the first indication information is used to indicate that an error has occurred in the N data units, and the second indication information is used to indicate that no error has occurred in the MN data units, and the MN data units are among the M data units excluding the N data units Data unit.
  • the detailed implementation process for the processing unit 202 to determine whether there is an error in the data unit among the M data units refer to the relevant content in step 102 of the embodiment shown in FIG. 6, which will not be described in detail here.
  • the frame header of the second data frame includes a first preamble and a first management information frame header
  • the frame header of the third data frame further includes a second preamble and a second management information frame header.
  • the second preamble and the second management information frame header are located before the response frame header.
  • the second data frame includes frame type indication information, and the frame type indication information is used to indicate that the frame type of the second data frame is the first frame type.
  • the frame type indication information is carried in the first management information frame header of the second data frame.
  • the second data frame includes an ACE, and the ACE is located after the frame header of the second data frame.
  • the first preamble, the first management information frame header, and the ACE respectively correspond to different OFDM symbols;
  • the second preamble, the second management information frame header, and the response frame header respectively correspond to different OFDM symbols.
  • the receiving unit 201 is configured to receive the first data frame in the first data transmission time slot
  • the sending unit 203 is configured to send a second data frame or a third data frame in a second data transmission time slot, and the second data transmission time slot is located after the first data transmission time slot.
  • the receiving unit receives the first data frame sent by the second device, the first data frame includes M data units, and M is an integer greater than zero.
  • the sending unit determines that none of the M data units has an error, it sends a second data frame to the second device.
  • the frame type of the second data frame is the first frame type, and the frame header of the second data frame does not include a response.
  • the frame header, the second data frame is used to indicate that none of the M data units has an error.
  • the second data frame is used to indicate that none of the M data units has an error
  • the processing unit determines that none of the M data units has an error
  • the second data frame responds to the M data to the second device Unit, because the frame header of the second data frame does not include the response frame header, the length of the payload part of the second data frame is increased, thereby increasing the communication capacity.
  • the length of the second data frame can be reduced to reduce the time required to transmit the second data frame, so that in the same data transmission time period, the number of transmission data frames can be increased to increase the communication capacity.
  • an embodiment of the present application provides a communication device 300 for a PLC system.
  • the device 300 may be deployed in the second device shown in any of the foregoing embodiments, and includes: a sending unit 301 and a processing unit 302 And the receiving unit 303;
  • the sending unit 301 is configured to send a first data frame to a first device, where the first data frame includes M data units, and M is an integer greater than 0;
  • the receiving unit 303 is configured to receive a second data frame sent by the first device, where when the frame type of the second data frame is the first frame type, the second data frame is used to indicate the M data units received by the first device No error occurred, and the second data frame does not include the response frame header;
  • the processing unit 302 is configured to determine the frame type of the second data frame, and when the frame type of the second data frame is the first frame type, determine that none of the M data units has an error.
  • the first data frame is generated by the processing unit 302.
  • the frame header of the second data frame includes a response frame header, and the first frame type is different from the second frame type, and the response frame header includes a first indication At least one of information and second indication information, the first indication information is used to indicate that there are errors in N data units in the M data units received by the first device, and the second indication information is used to indicate that MN data units have failed.
  • N is an integer greater than 0 and less than or equal to M
  • the MN data units are data units other than the N data units among the M data units;
  • the processing unit 302 is also used for:
  • the frame type of the second data frame is the second frame type
  • the N data units with errors and/or the M-N data units without errors are determined.
  • the processing unit 302 determines the detailed implementation process of the N data units with errors and/or the MN data units with no errors, please refer to the relevant content in step 106 of the embodiment shown in FIG. 12, here No more detailed description.
  • the frame header of the second data frame includes the first preamble and the first management information frame header
  • the frame header of the second data frame further includes a second preamble and a second management information frame header, and the second preamble and the second management information frame header are located in the response frame header Before.
  • the second data frame includes frame type indication information, and the frame type indication information is used to indicate the frame type of the second data frame,
  • the processing unit 302 is configured to determine the frame type of the second data frame according to the frame type indication information.
  • the processing unit 302 determines the detailed implementation process of the frame type of the second data frame according to the frame type indication information. Refer to the relevant content in step 104 of the embodiment shown in FIG. 6, which will not be described in detail here.
  • processing unit 302 is configured to:
  • Analyze the second data frame if the second data frame does not include the response frame header, determine the frame type of the second data frame as the first frame type; if the second data frame includes the response frame header, determine the second data frame The frame type is the second frame type.
  • the second data frame includes an ACE, and the ACE is located after the frame header of the second data frame.
  • the first preamble and the first management information frame header in the second data frame respectively correspond to different OFDM symbols;
  • the frame type of the second data frame is the second frame type
  • the second preamble, the second management information frame header, and the response frame header in the second data frame respectively correspond to different OFDM symbols.
  • processing unit 302 is configured to:
  • step 104 of the embodiment shown in FIG. 6, which will not be described in detail here.
  • the first data frame sent by the sending unit to the first device includes M data units, and M is an integer greater than zero.
  • the receiving unit receives the second data frame sent by the first device, where when the frame type of the second data frame is the first frame type, the second data frame is used to indicate that none of the M data units received by the first device has an error , The second data frame does not include the response frame header.
  • the processing unit determines the frame type of the second data frame, and when the frame type of the second data frame is the first frame type, it is determined that none of the M data units has an error.
  • the M data units are responded to by the second data frame, and since the second data frame does not include the response frame header, the length of the payload part of the second data frame is increased, thereby increasing the communication capacity.
  • the length of the second data frame can be reduced to reduce the time required to transmit the second data frame, so that in the same data transmission time period, the number of transmission data frames can be increased to increase the communication capacity.
  • an embodiment of the present application provides a schematic diagram of a communication device 400 used in a PLC system.
  • the apparatus 400 may be the first device in any of the foregoing embodiments.
  • the device 400 includes at least one processor 401, a bus system 402, a memory 403, and at least one transceiver 404.
  • the device 400 is a device with a hardware structure, and can be used to implement the functional modules in the device 200 described in FIG. 15.
  • the processing unit 202 in the device 200 shown in FIG. 15 can be implemented by calling the code in the memory 403 by the at least one processor 401.
  • the sending unit 203 may be implemented by the transceiver 404.
  • the aforementioned processor 401 may be a general-purpose central processing unit (central processing unit, CPU), network processor (network processor, NP), microprocessor, or application-specific integrated circuit (ASIC). , Or one or more integrated circuits used to control the execution of the program of this application.
  • CPU central processing unit
  • NP network processor
  • ASIC application-specific integrated circuit
  • the above-mentioned bus system 402 may include a path for transferring information between the above-mentioned components.
  • the aforementioned transceiver 404 is used to communicate with other devices or a communication network.
  • the aforementioned memory 403 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions.
  • the type of dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, optical discs Storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by Any other medium accessed by the computer, but not limited to this.
  • the memory can exist independently and is connected to the processor through a bus.
  • the memory can also be integrated with the processor.
  • the memory 403 is used to store application program code for executing the solution of the present application, and the processor 401 controls the execution.
  • the processor 401 is configured to execute the application program code stored in the memory 403, so as to realize the functions in the method of the present patent.
  • the processor 401 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 17.
  • the apparatus 400 may include multiple processors, such as the processor 401 and the processor 407 in FIG. 17. Each of these processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor.
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • an embodiment of the present application provides a schematic diagram of a communication device 500 used in a PLC system.
  • the apparatus 500 may be the first device in any of the foregoing embodiments.
  • the device 500 includes at least one processor 501, a bus system 502, a memory 503, and at least one transceiver 504.
  • the device 500 is a device with a hardware structure, and can be used to implement the functional modules in the device 300 described in FIG. 16.
  • the processing unit 302 in the device 300 shown in FIG. 16 can be implemented by calling the code in the memory 503 by the at least one processor 501.
  • the sending unit 301 may be implemented by the transceiver 504.
  • processor 501 may be a general-purpose central processing unit (central processing unit, CPU), network processor (network processor, NP), microprocessor, application-specific integrated circuit (ASIC) , Or one or more integrated circuits used to control the execution of the program of this application.
  • CPU central processing unit
  • NP network processor
  • ASIC application-specific integrated circuit
  • the above-mentioned bus system 502 may include a path for transferring information between the above-mentioned components.
  • the aforementioned transceiver 504 is used to communicate with other devices or a communication network.
  • the above-mentioned memory 503 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions.
  • the type of dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, optical discs Storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by Any other medium accessed by the computer, but not limited to this.
  • the memory can exist independently and is connected to the processor through a bus.
  • the memory can also be integrated with the processor.
  • the memory 503 is used to store application program codes for executing the solutions of the present application, and the processor 501 controls the execution.
  • the processor 501 is configured to execute the application program code stored in the memory 503, so as to realize the functions in the method of the present patent.
  • the processor 501 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 18.
  • the apparatus 500 may include multiple processors, such as the processor 501 and the processor 507 in FIG. 18.
  • processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor.
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the embodiment of the present application provides a communication system for a PLC system, which includes the device 200 provided in the embodiment shown in FIG. 15 and the device 300 provided in the embodiment shown in FIG. 16, or includes the implementation shown in FIG.
  • the apparatus 400 provided in the example and the apparatus 500 provided in the embodiment shown in FIG. 18 are provided.
  • the apparatus 200 provided in the embodiment shown in FIG. 15 or the apparatus 400 provided in the embodiment shown in FIG. 17 is the first device, and the apparatus 300 provided in the embodiment shown in FIG. 16 may be implemented as shown in FIG. 18.
  • the device 500 provided in the example is the second device.
  • the program can be stored in a computer-readable storage medium.
  • the storage medium mentioned can be a read-only memory, a magnetic disk or an optical disk, etc.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La divulgation concerne un procédé, un appareil et un système de communication pour un système de communication de ligne électrique, qui appartiennent au domaine des communications. Le procédé consiste : à recevoir par un premier dispositif, une première trame de données envoyée par un second dispositif, la première trame de données comprenant M unités de données, et M étant un nombre entier supérieur à 0 ; et lorsqu'il est déterminé qu'aucune erreur ne se produit dans toutes les M unités de données, à envoyer par le premier dispositif, une seconde trame de données au second dispositif, un type de trame de la seconde trame de données étant un premier type de trame ; une tête de trame de la seconde trame de données ne comprend pas de tête de trame de réponse ; et la seconde trame de données est utilisée pour indiquer qu'aucune erreur ne se produit dans toutes les M unités de données. Selon la présente demande, la capacité de communication peut être augmentée.
PCT/CN2021/077848 2020-04-01 2021-02-25 Procédé, appareil et système de communication pour système de communication de ligne électrique WO2021196931A1 (fr)

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