WO2020238190A1 - Procédé de transmission de données, nœud et support de stockage - Google Patents

Procédé de transmission de données, nœud et support de stockage Download PDF

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Publication number
WO2020238190A1
WO2020238190A1 PCT/CN2019/128413 CN2019128413W WO2020238190A1 WO 2020238190 A1 WO2020238190 A1 WO 2020238190A1 CN 2019128413 W CN2019128413 W CN 2019128413W WO 2020238190 A1 WO2020238190 A1 WO 2020238190A1
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WIPO (PCT)
Prior art keywords
node
data
transmission
nodes
concurrent
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PCT/CN2019/128413
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English (en)
Chinese (zh)
Inventor
曾焱
王祥
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华为技术有限公司
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Publication of WO2020238190A1 publication Critical patent/WO2020238190A1/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

Definitions

  • This application relates to the field of power line communication technology, and in particular to a method, node and storage medium for transmitting data.
  • the power line communication (PLC) technology mainly uses the widespread copper power line as the transmission medium to transmit data through low-frequency baseband signals.
  • Power lines are not dedicated communication lines, they are connected in parallel in an area, so PLC network is a point-to-multipoint shared medium network from the perspective of communication, so at the same time, only a pair of PLC nodes are allowed to communicate and transmit .
  • the PLC multiple-input multiple-output (MIMO) technology is implemented in the PLC network.
  • the PLC MIMO technology uses the live wire (L) and neutral wire deployed in the home (N) and the ground wire (PE) generate two parallel data paths, so that the number of data paths between the two nodes is changed from one (LN) to two (LN and LN common mode-PE), and the rate is doubled .
  • the application scenario of PLC MIMO technology is to use three power lines (fire wire, neutral wire and ground wire) for space division multiplexing between two nodes, and establish two data channels at the same time, which is more than single input single output (single input single output, SISO). )
  • SISO single input single output
  • a data transmission method which is applied to a power line communication PLC network, and the method includes:
  • the first node broadcasts a concurrency indication message, where the concurrency indication message includes a transmission time slot for parallel transmission of data; the first node selects a set of nodes for concurrent transmission, and the first node only collects data from the nodes Each node in the node sends a data transmission notification, and the data transmission notification is used to instruct each node in the node set to start sending data out from a target time point in the transmission time slot.
  • the first node when the first node meets certain conditions, it can determine to initiate parallel transmission, can generate a concurrent instruction message, determine the transmission time slot for parallel transmission of data, and add the transmission time slot to the concurrent instruction message in. Then the first node can broadcast the concurrent indication message through the PLC channel. When the first node broadcasts the concurrent transmission indication message, it determines all nodes that can be used for concurrent transmission in the PLC network, or after broadcasting the concurrent transmission indication message, determines all the nodes that can be used for concurrent transmission in the PLC network.
  • the first node After the first node selects a node set for concurrent transmission, it can generate a data transmission notification or obtain a pre-stored data transmission notification, and only send a data transmission notification to each node in the node set, but not to any node outside the node set.
  • the node sends a data transmission notification.
  • the node that receives the data transmission notification can start sending data out at the target time point of the transmission time slot, and the node that has not received the data transmission notification in the PLC network does not perform data transmission in the transmission time slot.
  • the first node can control all nodes in the node set to concurrently transmit data at the same point in time, and the number of nodes in the node set is not limited, so the total bandwidth of the PLC network can be improved.
  • the concurrency indication message further includes the target time point; or the data transmission notification further includes the target time point.
  • the concurrency indication message further includes the target time point; or the data transmission notification further includes the target time point.
  • the channel for sending the data transmission notification is any one of a wireless broadband (Wireless-Fidelity, Wi-Fi) channel, a visible light channel, an Ethernet channel, a coax channel, and a PLC channel.
  • a wireless broadband Wireless-Fidelity, Wi-Fi
  • Wi-Fi Wireless-Fidelity, Wi-Fi
  • the data sent by the second node is sent through a data frame
  • the method further includes: before the sending moment of the next data frame, the first node sends a first moment indication message to the second node through the first channel, wherein the first moment indication message is used to indicate all The sending moment of the next data frame; or, before the sending moment of the second data frame in the transmission time slot, the first node sends a second moment indication message to each node, wherein the The second time message is used to indicate the sending time of other data frames except the first data frame in the transmission time slot.
  • the solution shown in the embodiment of the present application may send the transmission time of each data frame before the transmission time of the data frame, or before the transmission time of the second data frame, change other data frames except the first data frame.
  • the sending time of the data frame is sent to each node together. In this way, the sending time of each data frame is indicated, which can make the sending time of the data frame more accurate.
  • the set of nodes selected by the first node to be used for concurrent transmission includes: the first node according to the difference between the nodes that can be used for concurrent transmission and the nodes that receive data in the PLC network Select a set of nodes for concurrent transmission; or, the first node selects a set of nodes based on the transmission rate between the nodes that can be used for concurrent transmission in the PLC network and the first node A collection of nodes for concurrent transmission; or, the first node selects according to the type of the channel used for sending the data transmission notification between the node that can be used for concurrent transmission in the PLC network and the first node A set of nodes used for concurrent transmission; or, the first node selects a set of nodes used for concurrent transmission according to the characteristics of the service flow.
  • the first node when the first node determines to initiate concurrent transmission, it can determine all the nodes that can be used for concurrent transmission in the PLC network to which it belongs, and all nodes that can be used for concurrent transmission can be Configured in the first node. Then the first node can obtain the transmission rate between all nodes that can be used for concurrent transmission and the node that receives data, and the transmission rate can be pre-configured in the first node. The first node can select a certain number of nodes among all nodes that can be used for concurrent transmission to form a set of nodes for concurrent transmission.
  • the first node when the first node determines to initiate concurrent transmission, it can determine that in the PLC network to which it belongs, all nodes that can be used for concurrent transmission, and all nodes that can be used for concurrent transmission, may be pre-configured in the first node. Then the first node can obtain the pre-configured transmission rate between the first node and each node used for concurrent transmission, and select a certain number of nodes to form a set of nodes used for concurrent transmission.
  • the first node when it determines to initiate concurrent transmission, it can determine that in the PLC network to which it belongs, all nodes that can be used for concurrent transmission, and all nodes that can be used for concurrent transmission, may be pre-configured in the first node. Then the first node can obtain the pre-configured type of the first channel between the first node and each node used for concurrent transmission. Using the type of the first channel, among all nodes that can be used for concurrent transmission, select the node whose type of the first channel is Wi-Fi to form a set of nodes for concurrent transmission. Or, select the node whose type of the first channel is visible light to form a node set for concurrent transmission. Or, among the various types of nodes in the first channel, nodes are selected respectively to form a node set for concurrent transmission.
  • the first node after the first node receives the data, it can determine the characteristics of the data, that is, the characteristics of the service flow, and then according to the characteristics of the service flow, if the characteristics of the service flow are voice calls or video calls, the timeliness of the service flow is relatively high. Therefore, it is necessary to select the Ethernet (high transmission rate) node of the first channel to form a node set for concurrent transmission. If it is web page data, the timeliness of the service flow is relatively low, and the node with the type of the first channel WIFI (low transmission rate) can be selected to form a node set for concurrent transmission.
  • the Ethernet high transmission rate
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; the first node is Among the nodes that can be used for concurrent transmission in the PLC network, the transmission rate with the node receiving the data is the largest, and there is a unique channel matrix between the first node and the node receiving the data.
  • the target number of nodes of the invertible matrix form a node set for concurrent transmission.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then, among the nodes that can be used for concurrent transmission in the PLC network, the transmission rate between each node and the node receiving the data is sorted from large to small. And determine the channel matrix between each node and the first node to the node that receives the data, judge whether the channel matrix has a unique invertible matrix, select the maximum transmission rate, and the channel matrix has a target number of nodes that have a unique invertible matrix to form A collection of nodes used for concurrent transmission. In this way, since a node with a higher transmission rate is selected, the data is quickly sent to the node that receives the data.
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and the first node is Among the nodes that can be used for concurrent transmission in the PLC network, the transmission rate with the first node is the largest, and the channel matrix between the first node and the node receiving data is uniquely reversible
  • the target number nodes of the matrix form a node set for concurrent transmission.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then, among the nodes that can be used for concurrent transmission in the PLC network, the transmission rates of each node and the first node are sorted from large to small. And determine the channel matrix between each node and the first node to the node that receives the data, judge whether the channel matrix has a unique invertible matrix, select the maximum transmission rate, and the channel matrix has a target number of nodes that have a unique invertible matrix to form A collection of nodes used for concurrent transmission. In this way, since a node with a larger transmission rate is selected, the data is quickly sent to the node for concurrent transmission.
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and the first node is Among the nodes that can be used for concurrent transmission in the PLC network, the type of the channel used to send the data transmission notification between the first node and the first node is the same as that of the first node to the node receiving the data. There is a unique invertible matrix in the channel matrix between the target number of nodes, which form a set of nodes for concurrent transmission.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then, among the nodes that can be used for concurrent transmission in the PLC network, determine the type of channel used to send data transmission notifications between each node and the first node, and determine the distance between each node and the first node to the node receiving the data
  • the channel matrix determines whether the channel matrix has a unique invertible matrix, selects the same channel type, and the channel matrix has a target number of nodes of the unique invertible matrix to form a node set for concurrent transmission. In this way, since the nodes with the same channel type are selected, the data transmission of the first node and the nodes in the node set can be synchronized as much as possible.
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; according to the characteristics and channels of the service flow To determine the target type corresponding to the characteristics of the service flow sent to the node that receives the data; among the nodes that can be used for concurrent transmission in the PLC network, select the target number of nodes to form In a set of concurrent transmission nodes, wherein the type of the channel between the target number of nodes and the first node is the target type, and the target number of nodes and the first node to the receiving
  • the channel matrix between data nodes has a unique invertible matrix.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then the first node may obtain the stored correspondence between the characteristics of the service flow and the channel type, and then in the correspondence, determine the target type corresponding to the characteristic of the service flow sent to the node receiving the data. And determine the channel matrix between each node and the first node to the node receiving the data, and judge whether the channel matrix has a unique invertible matrix.
  • the matrix has a unique invertible matrix, and the selected nodes form a node set. In this way, because the selected node is more compatible with the service flow, the data transmission efficiency can be higher.
  • the first node broadcasting a concurrency indication message includes: if the first node determines that data is sent to multiple nodes, then the first node broadcasting a concurrency indication message; or, if the first node If the node determines to send data to multiple nodes at the maximum rate, the first node broadcasts a concurrency indication message; or if the first node determines to send data to multiple nodes at the lowest delay, the first node broadcasts the concurrency indication Message; or, if the first node determines that the channel used for sending data transmission notifications connected to the node for concurrent transmission is idle, the first node broadcasts a concurrent indication message.
  • a method for transmitting data which is applied to a PLC network of power line communication, and the method includes:
  • the second node receives the concurrency indication message broadcast by the first node, where the concurrency indication message includes a transmission time slot for parallel transmission of data, and the second node is a set of nodes selected by the first node for concurrent transmission Any one of the nodes; after the second node receives the data transmission notification sent by the first node, start transmitting the received data from the target time point in the transmission time slot.
  • any node in the node set (which may be referred to as the second node in the following) can receive the concurrent indication message broadcast by the first node, obtain the concurrent time slot from it, and after receiving the data transmission notification , The data can be sent out at the target time point of the transmission time slot, so that multiple nodes in the node set can send data at the same time, which can realize concurrent data.
  • the method further includes: obtaining the target time point from the concurrency indication message; or obtaining the target time point from a configuration message of concurrent transmission of the second node Or, obtain the target time point from the data transmission notification sent by the first node.
  • the second node can determine the start time point of concurrent data transmission.
  • a node for transmitting data includes a processor, a receiver, and a transmitter, wherein:
  • the processor is used to select a set of nodes for concurrent transmission
  • the transmitter is further configured to send a data transmission notification only to each node in the node set, and the data transmission notification is used to instruct each node in the node set to start from a target time point in the transmission time slot. Start sending data out.
  • the data that each node sends out is sent through a data frame; the transmitter is further used to: send a first moment indication to each node before the sending moment of the next data frame Message, wherein the first moment indication message is used to indicate the sending moment of the next data frame; or, before the sending moment of the second data frame in the transmission time slot, send to each node
  • the second moment indication message where the second moment message is used to indicate the sending moment of other data frames except the first data frame in the transmission time slot.
  • the processor is configured to: select a set of nodes for concurrent transmission according to the transmission rate between the nodes that can be used for concurrent transmission and the nodes that receive data in the PLC network; or , According to the transmission rate between the nodes that can be used for concurrent transmission in the PLC network and the first node, select a set of nodes for concurrent transmission; or, according to the transmission rate between the nodes that can be used for concurrent transmission in the PLC network
  • the type of the channel used for sending the data transmission notification between the node and the first node is to select a node set for concurrent transmission; or, according to the characteristics of the service flow, a node set for concurrent transmission is selected.
  • the processor is configured to: determine the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; in the PLC network Among the nodes that can be used for concurrent transmission, the transmission rate with the node receiving data is the largest, and the channel matrix between the first node and the node receiving data has a unique invertible matrix.
  • the target number of nodes form a set of nodes for concurrent transmission.
  • the processor is configured to: determine the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; in the PLC network Among the nodes that can be used for concurrent transmission, the transmission rate with the first node is the largest, and the channel matrix between the first node and the node receiving data has a unique invertible matrix.
  • the target number of nodes form a set of nodes for concurrent transmission.
  • the processor is configured to: determine the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; in the PLC network Among the nodes that can be used for concurrent transmission, select the same type as the channel used for sending the data transmission notification between the first node and the channel between the first node and the node receiving the data
  • the matrix has the target number of nodes of a unique invertible matrix, which are composed of a set of nodes for concurrent transmission.
  • the processor is configured to: determine the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; according to the characteristics of the service flow and The corresponding relationship of the channel type determines the target type corresponding to the characteristics of the service flow sent to the node that receives the data; among the nodes that can be used for concurrent transmission in the PLC network, select the target number of nodes to form A set of nodes used for concurrent transmission, wherein the type of the channel between the target number of nodes and the first node is the target type, and the target number of nodes is related to the first node to the There is a unique invertible matrix in the channel matrix between the nodes receiving the data.
  • the transmitter is configured to: if it is determined that data is sent to multiple nodes, broadcast a concurrent indication message; or, if it is determined to send data to multiple nodes at the maximum rate, broadcast a concurrent indication message Or, if it is determined that the data is sent to multiple nodes according to the lowest delay, then broadcast a concurrency indication message; or if it is determined that the channel for sending data transmission notifications connected to the node for concurrent transmission is idle, then broadcast the concurrent indication message.
  • a data transmission node is provided, which is applied to a power line communication PLC network.
  • the node includes a processor, a transmitter and a receiver, wherein:
  • a receiver configured to receive a concurrency indication message broadcasted by a first node, where the concurrency indication message includes a transmission time slot for parallel transmission of data, and the second node is the one selected by the first node for concurrent transmission Any node in the node set;
  • the transmitter is configured to start transmitting the received data from a target time point in the transmission time slot after receiving the data transmission notification sent by the first node.
  • the processor is further configured to: obtain the target time point from the concurrency indication message; or obtain the target time point from a configuration message of concurrent transmission of the second node Point; or, obtain the target time point from the data transmission notification sent by the first node.
  • a data transmission node in a fifth aspect, includes one or more modules, and the one or more modules implement the data transmission method provided in the first aspect by executing instructions.
  • a data transmission node in a sixth aspect, includes one or more modules, and the one or more modules execute instructions to implement the data transmission method provided in the second aspect.
  • a computer-readable storage medium stores instructions that, when the computer-readable storage medium runs on a first node, cause the first node to perform the transmission provided in the first aspect. Data method.
  • a computer-readable storage medium stores instructions that, when the computer-readable storage medium runs on a second node, cause the second node to perform the transmission provided in the second aspect. Data method.
  • a computer program product containing instructions which when running on a node, causes the node to execute the data transmission method provided in the first aspect and the second aspect.
  • a system for transmitting data includes a first node and a second node, wherein:
  • the first node is the node that transmits data as described in the fifth aspect; the second node is the node that transmits data as described in the sixth aspect.
  • the first node when sending data in parallel in the PLC network, may broadcast a concurrent indication message, where the concurrent indication message includes a transmission time slot for parallel transmission of data, and then the first node may select a concurrent transmission
  • the node set only sends a data transmission notification to each node in the node set.
  • the data transmission notification is used to instruct each node in the node set to start sending data from the target time point in the transmission time slot, and each node in the node set
  • a node may receive the concurrency indication message broadcasted by the first node, and after each node receives the data transmission notification sent by the first node, start to transmit the received data from the target time point in the transmission time slot.
  • the first node can control all nodes in the node set to concurrently transmit data at the same point in time, and the number of nodes in the node set is not limited, so the transmission rate of the PLC network can be improved.
  • spatial multiplexing is essentially used to achieve simultaneous communication with multiple downstream nodes, which greatly reduces the communication delay caused by the target Time Division Multiple Access (TMDA) network scheduling .
  • TMDA Time Division Multiple Access
  • FIG. 1 is a schematic diagram of a PLC network scenario provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of the structure of a node provided by an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a method for transmitting data provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a frame format of a data frame provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a method for transmitting data according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of data transmission provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a node for transmitting data provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a node for transmitting data provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a data transmission node provided by an embodiment of the present application.
  • the embodiments of the application can be applied to a PLC network.
  • multiple nodes may be included, one of which is configured as a management node (the management node may also be referred to as a Domain Master (DM)) .
  • the management node may also be referred to as a Domain Master (DM)
  • DM Domain Master
  • it includes 4 nodes, among which node 1 is the management node, and any two nodes can be connected via PLC channels.
  • Scenario 1 In the PLC network, the management node can subsequently participate in concurrent transmission, and the management node can be used to connect to the access network.
  • Scenario 2 In the PLC network, the management node is only used to manage other nodes and does not participate in concurrent transmission.
  • management of other nodes refers to controlling other nodes' concurrent transmission time slots, and controlling when other nodes start concurrent transmission.
  • the embodiment of the present application provides a method for transmitting data.
  • the execution subject of the method may be a node, and the node may be a power line terminal device (power modem).
  • FIG. 2 shows a structural block diagram of a node in an embodiment of the present application.
  • the node may be the first node mentioned later, or the second node mentioned later.
  • the node may at least include a receiver 201, a processor 202, a memory 203, and a transmitter 204.
  • the receiver 201 can be used to receive data
  • the transmitter 204 can be used to send data
  • the memory 203 can be used to store software programs and modules
  • the processor 202 runs the software programs and modules stored in the memory 203, In order to perform various functional applications and data processing.
  • the memory 203 may mainly include a program storage area and a data storage area.
  • the program storage area may store an operating system, an application program required by at least one function, and the like; the data storage area may store data created according to the use of nodes, etc.
  • the memory 203 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.
  • the memory 203 may further include a memory controller to provide access to the memory 203 by the processor 202, the receiver 201, and the transmitter 204.
  • the processor 202 is the control center of the node. It uses various interfaces and lines to connect the various parts of the entire node. It executes by running or executing software programs and/or modules stored in the memory 203, and calling data stored in the memory 203.
  • Various functions and processing data of the node so as to monitor the node as a whole.
  • the processor 202 may include one or more processing cores; preferably, the processor 202 may integrate an application processor and a modem processor, where the application processor mainly processes the operating system, user interface, and application programs, etc. ,
  • the modem processor mainly deals with wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 202.
  • the present application provides a method for transmitting data, which is applied in the PLC network below the above scenario, and the processing flow of the method can be as follows:
  • Step 301 The first node broadcasts a concurrency indication message, where the concurrency indication message includes a transmission time slot for parallel transmission of data.
  • the first node when the first node meets certain conditions, it can determine to initiate parallel transmission, then can generate a concurrent instruction message, determine a transmission time slot for parallel transmission of data, and add the transmission time slot to the concurrent instruction message. Then the first node can broadcast the concurrent indication message through the PLC channel. Since the concurrent indication message is transmitted through broadcast, the concurrent indication message can be received as long as the link between the nodes in the PLC network is not broken.
  • the first node is the management node, and the data to be sent to the PLC network will pass through the first node.
  • the first node can determine the amount of data to be sent to the node receiving the data this time.
  • the transmission time slot is determined based on the amount of data. Generally, the larger the amount of data, the longer the transmission time slot. For example, the corresponding relationship between the data volume range and the transmission time slot can be stored.
  • the first node can determine the data volume range to which the data volume sent to the node receiving the data belongs, and determine the transmission time slot corresponding to the data volume range, that is, step 301 Mentioned in the transmission time slot.
  • the start time point of the foregoing transmission time slot may be a certain time period after the concurrency indication message is broadcast.
  • Manner 1 If the first node determines that data is sent to multiple nodes, the first node broadcasts a concurrency indication message.
  • the first node as the management node, can determine the received data and the node to be sent to (the received data will carry the identification of the node to which it is sent). In this way, the first node is based on the data to be sent.
  • the node can determine the number of nodes to be sent to. If the number is greater than or equal to 2, then it can be determined to initiate a concurrent transmission, and a concurrent indication message can be broadcast. In this way, since concurrent transmission is not initiated, only one node's data can be sent at a time, resulting in a relatively low efficiency of sending data. Therefore, when sending data to multiple nodes, the data can be quickly sent to the receiving data through concurrent transmission. node.
  • Manner 2 If the first node determines to send data to multiple nodes at the maximum rate, the first node broadcasts a concurrency indication message.
  • the first node as the management node, can determine the received data, the node to be sent to, and the type of the received data, and then use the correspondence between the stored type and the transmission rate to determine the received data The transmission rate corresponding to the type. If the obtained transmission rate is the maximum transmission rate in the corresponding relationship, it is determined to transmit data at the maximum rate. In this way, it can be determined to send data to multiple nodes according to the maximum transmission rate, it can be determined to initiate concurrent transmission, and the concurrent indication message can be broadcast. In this way, data can be transmitted to multiple nodes through concurrent transmission, so that data can be quickly sent to multiple nodes.
  • Manner 3 If the first node determines to send the data to multiple nodes according to the lowest delay, the first node broadcasts a concurrency indication message.
  • the first node as the management node, can determine the received data, the node to be sent to, and the type of data received, and then use the correspondence between the stored type and the transmission delay to determine the received data The type of corresponding transmission delay. If the obtained transmission delay is the lowest transmission delay in the corresponding relationship, it is determined to transmit the data according to the lowest delay. And the first node can determine the number of nodes to be sent to according to the node to be sent to. If the number is greater than or equal to 2, then it can be determined to be sent to multiple nodes. In this way, it can be determined to follow the lowest transmission delay.
  • you can determine to initiate concurrent transmission and you can broadcast a concurrent indication message. In this way, data can be transmitted to multiple nodes through concurrent transmission, thereby reducing delay.
  • Manner 4 If the first node determines that the channel connected to the node for concurrent transmission for sending the data transmission notification is idle, the first node broadcasts a concurrent indication message.
  • the first node as the management node, can determine whether all the channels used for sending data transmission notifications between the nodes connected to itself that can be used for concurrent transmission are transmitting data. If data is not being transmitted, it can determine whether If the channel is idle, it can be determined to initiate concurrent transmission, and it can broadcast concurrent indication messages. In this way, it can be guaranteed that only a group of nodes are transmitting data in parallel in the same transmission time slot.
  • the concurrency indication message also includes the number of frames, the frame interval between data frames, the number of redundant symbols, and the number of symbols per frame.
  • the frame interval refers to the time interval for sending data frames
  • the number of redundant symbols indicates how many header symbols, etc.
  • the number of symbols per frame refers to the number of symbols included in each data frame.
  • P and H represent redundant symbols
  • D represent symbols of transmitted data.
  • nodes that subsequently transmit data in parallel can use the content in the concurrency indication message to concurrently transmit the received data.
  • Step 302 The first node selects a set of nodes for concurrent transmission.
  • the first node can determine all nodes that can be used for concurrent transmission in the PLC network when broadcasting the concurrent instruction message, or determine all nodes that can be used for concurrent transmission in the PLC network after broadcasting the concurrent transmission instruction message.
  • the transmitting node can determine all nodes that can be used for concurrent transmission in the PLC network when broadcasting the concurrent instruction message, or determine all nodes that can be used for concurrent transmission in the PLC network after broadcasting the concurrent transmission instruction message.
  • the first node can select the nodes used for concurrent transmission this time among all the nodes that can be used for concurrent transmission. These nodes form a node set.
  • This application provides the following four processing methods:
  • Method 1 The first node selects a set of nodes for concurrent transmission based on the transmission rate between the nodes that can be used for concurrent transmission and the nodes that receive data in the PLC network.
  • the first node when the first node determines to initiate concurrent transmission, it can determine all the nodes that can be used for concurrent transmission in the PLC network to which it belongs, and all the nodes that can be used for concurrent transmission can be pre-configured in the first node in. Then the first node can obtain the transmission rate between all nodes that can be used for concurrent transmission and the node that receives data, and the transmission rate can be pre-configured in the first node.
  • the first node can select a certain number of nodes among all nodes that can be used for concurrent transmission to form a set of nodes for concurrent transmission.
  • a node with a large transmission rate can be selected, and the corresponding processing can be as follows:
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and the first node selects and receives data among the nodes that can be used for concurrent transmission in the PLC network
  • the transmission rate between the nodes is the largest, and the channel matrix between the first node and the node receiving the data has a target number of nodes of a unique invertible matrix, forming a set of nodes for concurrent transmission.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then, among the nodes that can be used for concurrent transmission in the PLC network, the transmission rate between each node and the node receiving the data is sorted from large to small. And determine the channel matrix between each node and the first node to the node that receives the data, judge whether the channel matrix has a unique invertible matrix, select the maximum transmission rate, and the channel matrix has a target number of nodes that have a unique invertible matrix to form A collection of nodes used for concurrent transmission.
  • the first node selects a set of nodes for concurrent transmission based on the transmission rate between the nodes that can be used for concurrent transmission in the PLC network and the first node.
  • the first node when the first node determines to initiate concurrent transmission, it can determine all the nodes that can be used for concurrent transmission in the PLC network to which it belongs, and all the nodes that can be used for concurrent transmission can be pre-configured in the first node . Then the first node can obtain the pre-configured transmission rate between the first node and each node used for concurrent transmission, and select a certain number of nodes to form a set of nodes used for concurrent transmission.
  • a node with a higher transmission rate than the first node can be selected, and the corresponding processing can be as follows:
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and the first node is selected from the nodes that can be used for concurrent transmission in the PLC network.
  • the transmission rate between nodes is the largest, and the channel matrix between the first node and the node receiving data has a target number of nodes of a unique invertible matrix, forming a node set for concurrent transmission.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then, among the nodes that can be used for concurrent transmission in the PLC network, the transmission rates of each node and the first node are sorted from large to small. And determine the channel matrix between each node and the first node to the node that receives the data, judge whether the channel matrix has a unique invertible matrix, select the maximum transmission rate, and the channel matrix has a target number of nodes that have a unique invertible matrix to form A collection of nodes used for concurrent transmission.
  • Manner 3 The first node selects a set of nodes for concurrent transmission according to the type of the first channel between the nodes that can be used for concurrent transmission and the first node in the PLC network.
  • the first node when it determines to initiate concurrent transmission, it can determine all the nodes that can be used for concurrent transmission in the PLC network to which it belongs, and all the nodes that can be used for concurrent transmission can be pre-configured in the first node . Then the first node may obtain the pre-configured type of the first channel between the first node and each node used for concurrent transmission. Using the type of the first channel, among all nodes that can be used for concurrent transmission, select the node whose type of the first channel is Wi-Fi to form a set of nodes for concurrent transmission. Or, select the node whose type of the first channel is visible light to form a node set for concurrent transmission. Or, among the various types of nodes in the first channel, nodes are selected respectively to form a node set for concurrent transmission.
  • nodes of the same channel type can be selected to form a node set, and the corresponding processing can be as follows:
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and the first node is selected from the nodes that can be used for concurrent transmission in the PLC network.
  • the types of channels used to send data transmission notifications between nodes are the same, and the channel matrix between the first node and the node that receives data has a unique invertible matrix.
  • the target number of nodes is composed of a set of nodes for concurrent transmission. .
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then, among the nodes that can be used for concurrent transmission in the PLC network, determine the type of channel used to send data transmission notifications between each node and the first node, and determine the distance between each node and the first node to the node receiving the data.
  • the channel matrix determines whether the channel matrix has a unique invertible matrix, selects the same channel type, and the channel matrix has a target number of nodes of the unique invertible matrix to form a node set for concurrent transmission.
  • the invertible matrix of the channel matrix between each node and the first node to the node receiving data is unique. If the maximum number of nodes with the same channel type is less than the target number, then select the maximum number of nodes with the same channel type (for the convenience of description later, it may be called the first number) nodes, and can be used in the remaining PLC network Among the nodes for concurrent transmission, a second number of nodes with the same channel type are selected (the second number is equal to the target number minus the first number), and the two selected nodes form a node set.
  • the target number is 5, and the maximum number of nodes with the same channel type is 3, then among the remaining nodes in the PLC network that can be used for concurrent transmission, select 2 nodes with the same channel type, and replace the previously selected 3 A node and the 2 nodes selected later form a node set.
  • Method 4 The first node selects a set of nodes for concurrent transmission according to the characteristics of the service flow.
  • the first node after the first node receives the data, it can determine the characteristics of the data, that is, the characteristics of the service flow, and then according to the characteristics of the service flow, if the characteristics of the service flow are voice calls or video calls, then the timeliness of the service flow is compared. High, so choose the type of Ethernet (high transmission rate) node for the first channel of transmission to form a node set for concurrent transmission. If it is webpage data, the timeliness of the service flow is relatively low, and the node with the first channel type Wi-Fi (low transmission rate) can be selected to form a node set for concurrent transmission.
  • the characteristics of the data that is, the characteristics of the service flow
  • the characteristics of the service flow are voice calls or video calls
  • the timeliness of the service flow is compared. High, so choose the type of Ethernet (high transmission rate) node for the first channel of transmission to form a node set for concurrent transmission. If it is webpage data, the timeliness of the service flow is relatively low, and the node with the first
  • the service flow feature can be used to determine the channel type first, and then select the node set for concurrent transmission.
  • the corresponding processing can be as follows:
  • the first node determines the target number of nodes used for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and the corresponding relationship between the characteristics of the service flow and the channel type determines the node to send the data to The characteristics of the service flow correspond to the target type.
  • select the target number of nodes to form a set of nodes for concurrent transmission where the target number of nodes is between the first node
  • the type of the channel is the target type, and the channel matrix between the target number of nodes and the first node to the node receiving data has a unique invertible matrix.
  • the first node may determine the target number of nodes used for concurrent transmission this time, and the target number may be greater than or equal to the number of nodes receiving data. Then the first node may obtain the stored correspondence between the characteristics of the service flow and the channel type, and then in the correspondence, determine the target type corresponding to the characteristic of the service flow sent to the node receiving the data. And determine the channel matrix between each node and the first node to the node receiving the data, and judge whether the channel matrix has a unique invertible matrix.
  • the matrix has a unique invertible matrix, and the selected nodes form a node set.
  • the channel matrix between the node in the node set and the first node to the node receiving data has a unique invertible matrix. This is because the precoding matrix mentioned later is The inverse of the channel matrix. If the channel matrix is not a unique invertible matrix, then the precoding matrix is not unique, and concurrent data will not succeed.
  • Step 303 The first node only sends a data transmission notification to each node in the node set, and the data transmission notification is used to instruct each node in the node set to send data out from the target time point in the transmission time slot.
  • the first node after the first node determines the node set, it can only send data transmission notifications to each node in the node set, and does not send data transmission notifications to nodes other than the node set in the PLC network. In this way, receiving The node that is notified of the data transmission can start sending data from the target time point in the transmission time slot, while the node that has not received the data transmission notification will not send data in the transmission time slot, so that no data transmission is received The notified node will not affect the parallel sending of data.
  • a first channel is established between the first node and each node in the node set.
  • the first node can pass through the first node and The first channel between the second nodes sends a data transmission notification to the second node.
  • the first channel is a channel other than a common PLC channel between the first node and the second node, and the first channel can be any one of a Wi-Fi channel, a visible light channel, an Ethernet channel, a coax channel, and a PLC channel.
  • the first channel is a PLC channel
  • the transmission rate of the PLC channel is relatively large, which is greater than the transmission rate of the ordinary PLC channel.
  • the above-mentioned first node sending a data transmission notification to the second node may be carried in the data and sent to the second node when the data required to be transmitted by the second node is sent to the second node in the first channel established with the second node.
  • the first node may determine the target time point after determining the transmission time slot, which may be a certain time point after the start of the transmission time slot, or the start time point of the transmission time slot.
  • the time point is carried in the transmission time slot, and the target time point can also be carried in the data transmission notification.
  • the difference between the transmission rate of the first channel and the transmission rate of the PLC channel is greater than the second threshold.
  • the second threshold is generally larger, which is used to indicate that the transmission rate of the first channel is much greater than the transmission rate of the PLC channel, that is, the transmission rate between the first node and the second node is much greater than the first node to receive data The transmission rate between nodes. In this way, it can be ensured that data can be quickly sent from the first node to the second node without affecting the concurrent transmission of data by the second node in the transmission time slot.
  • the second node sends out data through a data frame
  • the first node may indicate the sending time of the next data frame
  • the corresponding processing may be as follows:
  • the first node Before the sending moment of the next data frame, the first node sends a first moment indication message to the second node, where the moment indication message is used to indicate the sending moment of the next data frame.
  • the first node before the sending time of the next data frame, can send the first time indication message to the second node (which can be sent from the first channel), which can be carried in the previous data frame when sending data In the data sent.
  • the second node can obtain the sending time of the next data frame from the adjacent data frame before the data frame to be sent, thereby ensuring that each concurrent node concurrently sends data at the same time point each time.
  • the second node sends out data through data frames
  • the first node can indicate the sending time of each data frame
  • the corresponding processing can be as follows:
  • the first node Before the sending time of the second data frame in the transmission time slot, the first node sends a second time indication message to each node, where the second time message is used to indicate the transmission time slot except for the first data frame The sending time of other data frames.
  • the first node may send a second moment indication message to each node (may be sent through the first channel), and the second moment indication message may be a moment rule (for example, it may be 5n milliseconds, n represents the data frame sent in the transmission time slot of the data frame, n is greater than 1, so the sending time of the second data frame is 5*2 milliseconds), or it can be a transmission time The sending time of each data frame except the first data frame in the slot.
  • the data sent out by any node in the node set is sent by the first node.
  • the first node sends the first data to the second node in the node set as an example.
  • There are many ways to send data Two possible implementations are given below:
  • Manner 1 The first node performs precoding processing on the first data to obtain frequency domain data of the first data, and sends the frequency domain data of the first data to the second node through a channel for sending a data transmission notification.
  • the second node receives the frequency domain data of the first data sent by the first node through the channel for sending the data transmission notification.
  • the second node starts to transmit the frequency domain data of the first data from the target time point in the transmission time slot.
  • the first node can determine the data to be sent by the second node in the data to be sent (data to be received by the receiving node) (which may be referred to as the first data later, and how to determine it will be explained later).
  • a message can be sent to the second node to instruct to obtain the bit allocation table, forward error correction code, and code rate of the second node.
  • the second node After the second node receives it, it can obtain its own bit allocation table, forward error correction code and code rate from the configuration information, and then send the bit allocation table, forward error correction code and code rate to the second node (you can It is sent through the channel used to send the data transmission notification, that is, sent through the first channel).
  • the first node After the first node receives it, it can obtain the precoding matrix, and then use the precoding matrix, the bit allocation table sent by the second node, the forward error correction code and the code rate to precode the first data concurrently transmitted by the second node Process to obtain frequency domain data of the first data. Then the first node sends the frequency domain data of the first data to the second node through the first channel.
  • the second node after the second node receives the frequency-domain data of the first data sent by the first node, it can directly send the frequency-domain data of the first data at the target time point of the transmission time slot without processing, which can save the second The processing resources of the node.
  • Manner 2 The first node sends the bit data of the data to be sent to the second node through a channel for sending a data transmission notification.
  • the second node receives the bit data of the data to be sent sent by the first node through the channel for sending the data transmission notification, and the second node pre-encodes the bit data to obtain the frequency domain data of the first data sent by the second node ,
  • the second node starts to transmit the frequency domain data of the first data from the target time point in the transmission time slot.
  • the first node can determine the data to be sent (all data received by the node that receives the data), and the first node can send the precoding matrix to the second node (which can be sent through the channel used to send the data transmission notification). And the first node sends the bit data of the data to be sent to the second node through the channel for sending the data transmission notification.
  • the second node After receiving it, the second node can obtain its own bit allocation table, forward error correction code and code rate from the configuration information. Then use the precoding matrix, its own bit allocation table, forward error correction code, and code rate to perform precoding processing on the bit data of the data to be sent to obtain the frequency domain data of the first data sent by itself (also available here Frequency domain data sent by other concurrent nodes). Then the second node may send the frequency domain data of the first data to the outside, which may be the frequency domain data of the first data through the PLC channel established between the node receiving the data and the second node.
  • the first node processes the data in the above manner 1, and the second node does not need to process the data, which can save the processing resources of the second node and occupy the processing resources of the first node.
  • the first node does not process data
  • the second node processes data, which can save the processing resources of the first node and occupy the processing resources of the second node.
  • the first node sends the frequency domain data of the first data to the second node, it can carry the identifier of the node receiving the data, so that the second node can use the identifier to determine the node to which the first data is to be sent, and directly The frequency domain data of the first data is sent to the node to which the first data is to be sent.
  • the first node when it sends the bit data of the data to be sent to the second node, it can also carry the identifier of the node receiving the data, so that the second node can use the identifier to determine the node to which the first data is to be sent , Directly send the frequency domain data of the first data to the node to which the first data is to be sent.
  • the identifier of the receiving node may be carried in the frame header of the data frame.
  • the first node initiates concurrent transmission with the second node in the node set, and the nodes receiving data are A1 and A2, and the first node and the second node are in two consecutive symbols (the number depends on the estimated channel matrix size)
  • A1 and A2 can respectively feed back the signal Y ref sent by the first node and the second node to the first node:
  • H can be obtained by multiplying the inverse of X ref on the basis of Y ref :
  • the H obtained in formula (3) is the channel matrix, and the inverse of the channel matrix H is the precoding matrix.
  • the reason why the node receiving the data can receive the correct data is also given.
  • the first node and the second node are used to send data in parallel, and the nodes that receive the data are A1 and A2.
  • the first node can determine the corresponding precoding matrix P (the following is a feasible way, direct zero-forcing algorithm):
  • the data X received by the two nodes receiving the data that is, A1 receives X 1 , and A2 receives X 2 :
  • the data sent by the first node is P 11 X 1 + P 21 X 2
  • the data sent by the second node is P 12 X 1 + P 22 X 2
  • the signal received by the two nodes receiving the data is Y:
  • A1 can receive X 1 and A2 can receive X 2 .
  • each concurrent transmission node sends the precoded matrix
  • the data sent by the first node is P 11 X 1 + P 21 X 2
  • the data sent by the second node is P 12 X 1 + P 22 X 2 .
  • a method for performing concurrent processing by any node in the node set (which may be referred to as the second node later) is also provided. As shown in FIG. 5, the steps may be as follows:
  • Step 501 The second node receives a concurrent indication message broadcasted by the first node, where the concurrent indication message includes a transmission time slot for parallel transmission of data, and the second node is any of the node sets selected by the first node for concurrent transmission.
  • the concurrent indication message includes a transmission time slot for parallel transmission of data
  • the second node is any of the node sets selected by the first node for concurrent transmission.
  • the second node in the node set may receive the concurrency indication message broadcast by the first node, and from the concurrency indication message, the parallel transmission data transmission time slot is obtained by parsing.
  • Step 502 After the second node receives the data transmission notification sent by the first node, start transmitting the received data from the target time point in the transmission time slot.
  • the second node may receive the data transmission notification sent by the first node, and after receiving the data transmission notification, the target time point may be obtained, and the target time point belongs to the transmission time slot. Then the received data is transmitted from the target time point in the transmission slot.
  • the second node may parse the concurrency indication message after step 502 to obtain the transmission time slot of the data in parallel.
  • Method 1 Obtain the target time point from the concurrent indication message.
  • the first node when the first node sends the concurrency indication message, it adds the target time point to the concurrency indication message. After the second node receives the concurrency indication message, it can parse the target time point from it, so that the target time point can be obtained. Point in time.
  • Manner 2 Obtain the target time point from the configuration information of the concurrent transmission of the second node.
  • the technician may configure concurrent transmission configuration information in the second node, the configuration information may include the target time point, and store the configuration information in the second node.
  • the second node subsequently obtains the target time point from the stored configuration information.
  • the target time point is 2 milliseconds after the start of the transmission slot.
  • the target time point is the start time point of the transmission time slot.
  • Manner 3 Obtain the target time point from the data transmission notification sent by the first node.
  • the target time point may be added to the data transmission notification, and the data transmission notification is sent to the second node together with the data transmission notification.
  • the second node can subsequently obtain the target time point from the data transmission notification.
  • the second node may receive the data transmission notification sent by the first node through the first channel, where the first channel is a channel between the second node and the first node, and the channel is a Wi-Fi channel, visible light Any one of channel, Ethernet channel, coax channel, PLC channel.
  • the first channel is a PLC channel
  • the transmission rate of the PLC channel is relatively large, which is greater than the transmission rate of the ordinary PLC channel. Since the transmission rate of the first channel is greater than that of the ordinary PLC channel, the data transmission notification is transmitted through the first channel, so that the second node can quickly receive the data transmission notification.
  • the second node starts to transmit the received data from the target time point in the transmission time slot through the second channel (the ordinary PLC channel established between the second node and the node that receives the data), and the first node passes through itself
  • the second channel with the node receiving the data starts to transmit data from the target time point in the transmission time slot.
  • the second channel is a PLC channel.
  • the sending diagram is given.
  • the first node sends a data transmission notification to the second node at other times before the transmission time slot.
  • the first node is transmitting The target time point of the time slot and the second node send data at the same time.
  • the node receiving the data receives the data, if it can be successfully decoded, it can send a confirmation message to the node sending the data. If it cannot be successfully decoded, a non-acknowledgement message can be sent to the node that sent the data.
  • the time point for sending the confirmation message or the non-confirmation message can be configured through a protocol. For example, after receiving the data, the node that receives the data can immediately feed back a confirmation message to the node that sent the data.
  • the second node may receive the first moment indication message or the second moment indication message sent by the first node. If the first moment indication message is received, the sending time of the next data frame can be obtained from the sending time. Send the next data frame. If the second time indication message is received, the sending time of each data frame after the target time point can be obtained from it, and the sending time of each data frame after the target time point can be calculated according to the time rule.
  • the sending time interval of each data frame may be pre-configured in the second node, and the second node may Send a data frame at this time interval.
  • the solution of the present application can be used to achieve enhancement, which can be described as follows:
  • the first node is the management node and takes into account parallel transmission of data.
  • the second node is the node that sends data in parallel by the first node. Assuming that only node A3 sends data, then the first node and the second node send data
  • the source data is the same, both are X 1.
  • the relationship between the data sent by the first node and the second node and the data received by the node receiving the data is:
  • H represents the channel between the first node and the second node and A3
  • P represents the precoding matrix
  • the principle of calculating the precoding matrix P is to maximize the power of the signal received by the node receiving the data.
  • the difference with the number of nodes receiving data is that the node receiving data does not need to reply confirmation messages to all concurrent transmission nodes, and the node receiving data only needs to reply confirmation messages to the first node.
  • This application provides a method for transmitting data, which is applied to the PLC network under the second scenario above.
  • the difference between this method and the PLC network applied to the following scenario is:
  • the first node does not participate in concurrent transmission, and is only used to manage all nodes in the PLC network, including broadcasting concurrent indication messages and selecting a set of nodes for concurrent transmission.
  • the target node there is a node (which can be called the target node) that can be used to receive data outside the PLC network.
  • the target node After the target node receives the data outside the PLC network, it can send the data amount and the amount of data to the first node. Type and identification of the node receiving the data.
  • a first channel is established between the target node and each node in the PLC network that can be used for concurrent transmission.
  • the first node may select a set of nodes for concurrent transmission among the nodes for concurrent transmission based on the amount of data sent by the target node, the type of data, and the identification of the node receiving the data. Then send a data transmission notification to each node in the node set. Or, here can also be the first node sending the identity of each node in the node set to the target node. After the target node receives it, it can determine the node corresponding to the received node’s identity, and send it to the target node through the first channel established with these nodes. These nodes send data transfer notifications.
  • the target node may send data requiring concurrent transmission by the second node to the second node in the node set, which may be a second channel (common PLC channel) established by the channel and these nodes for transmission.
  • a second channel common PLC channel
  • the first node when sending data in parallel in the PLC network, may broadcast a concurrent indication message, where the concurrent indication message includes a transmission time slot for parallel transmission of data, and then the first node may select a concurrent transmission
  • the node set only sends a data transmission notification to each node in the node set.
  • the data transmission notification is used to instruct each node in the node set to start sending data from the target time point in the transmission time slot, and each node in the node set
  • a node may receive the concurrency indication message broadcasted by the first node, and after each node receives the data transmission notification sent by the first node, start to transmit the received data from the target time point in the transmission time slot.
  • the first node can control all nodes in the node set to concurrently transmit data at the same point in time, and the number of nodes in the node set is not limited, so the transmission rate of the PLC network can be improved.
  • spatial multiplexing is essentially used to achieve simultaneous communication with multiple downstream nodes, which greatly reduces the communication delay caused by TMDA network scheduling.
  • Fig. 7 is a structural diagram of a node for transmitting data provided by an embodiment of the present application.
  • the node can be implemented as part or all of the node through software, hardware or a combination of both.
  • the node provided in the embodiment of the present application can implement the process described in FIG. 3 of the embodiment of the present application.
  • the node includes: a sending module 610 and a determining module 620, wherein:
  • the sending module 710 is configured to broadcast a concurrency indication message, where the concurrency indication message includes a transmission time slot for parallel transmission of data, which can specifically implement the sending function in step 301;
  • the determining module 720 is configured to select a set of nodes used for concurrent transmission, which can specifically implement the determining function in the above step 302 and its implicit steps;
  • the sending module 710 is further configured to only send a data transmission notification to each node in the node set, and the data transmission notification is used to instruct each node in the node set from Start sending data out at the target time point, which can specifically realize the sending function in step 303 and its implicit steps;
  • the second node is any node in the node set.
  • the channel for sending the data transmission notification is any one of a Wi-Fi channel, a visible light channel, an Ethernet channel, a coax channel, and a PLC channel.
  • the data sent by each node is sent through a data frame
  • the sending module 710 is also used for:
  • the determining module 720 is configured to:
  • the transmission rate between the nodes that can be used for concurrent transmission and the nodes that receive data in the PLC network select a set of nodes for concurrent transmission; or,
  • the transmission rate between the nodes that can be used for concurrent transmission in the PLC network and the first node select a set of nodes for concurrent transmission; or,
  • the channel used for sending the data transmission notification between the node that can be used for concurrent transmission in the PLC network and the first node select a set of nodes for concurrent transmission; or,
  • the node set for concurrent transmission is selected.
  • the determining module 720 is configured to:
  • the transmission rate with the node receiving data is the largest, and there is a channel matrix between the first node and the node receiving data.
  • the target number of nodes of the unique invertible matrix form a set of nodes for concurrent transmission.
  • the determining module 720 is configured to:
  • the transmission rate with the first node is the largest, and the channel matrix between the first node and the node receiving data is unique
  • the target number of nodes in the invertible matrix of, constitute a set of nodes for concurrent transmission.
  • the determining module 720 is configured to:
  • the type of the channel used to send the data transmission notification between the first node and the first node is the same as that of the first node to the received data.
  • the determining module 720 is configured to:
  • the nodes that can be used for concurrent transmission in the PLC network select the target number of nodes to form a set of nodes for concurrent transmission, wherein the channel between the target number of nodes and the first node
  • the type of is the target type, and there is a unique invertible matrix in the channel matrix between the number of target nodes and the first node to the node receiving the data.
  • the sending module 710 is configured to:
  • a concurrent indication message is broadcast.
  • the concurrency indication message further includes the target time point; or the data transmission notification further includes the target time point.
  • Fig. 8 is a structural diagram of a node for transmitting data provided by an embodiment of the present application.
  • the node can be implemented as part or all of the node through software, hardware or a combination of both.
  • the node provided in the embodiment of the present application can implement the process described in FIG. 3 of the embodiment of the present application.
  • the node includes: a receiving module 810 and a sending module 820, wherein:
  • the receiving module 810 is configured to receive a concurrent indication message broadcast by a first node, where the concurrent indication message includes a transmission time slot for parallel transmission of data, and the second node is selected by the first node for concurrent transmission Any one of the nodes in the set of nodes can specifically implement the receiving function in step 501 above and its implicit steps;
  • the sending module 820 is configured to, after the second node receives the data transmission notification sent by the first node, start to transmit the received data from the target time point in the transmission time slot, which can specifically implement the above step 502 The sending function in and its hidden steps.
  • the node further includes an obtaining module 830, configured to:
  • the first node when sending data in parallel in the PLC network, may broadcast a concurrent indication message, where the concurrent indication message includes a transmission time slot for parallel transmission of data, and then the first node may select a concurrent transmission
  • the node set only sends a data transmission notification to each node in the node set.
  • the data transmission notification is used to instruct each node in the node set to start sending data from the target time point in the transmission time slot, and each node in the node set
  • a node may receive the concurrency indication message broadcasted by the first node, and after each node receives the data transmission notification sent by the first node, start to transmit the received data from the target time point in the transmission time slot.
  • the first node can control all nodes in the node set to concurrently transmit data at the same point in time, and the number of nodes in the node set is not limited, so the transmission rate of the PLC network can be improved.
  • spatial multiplexing is essentially used to achieve simultaneous communication with multiple downstream nodes, which greatly reduces the communication delay caused by TMDA network scheduling.
  • the node provided in the above embodiment transmits data
  • only the division of the above functional modules is used as an example.
  • the above function can be allocated by different functional modules as needed, that is, the node's The internal structure is divided into different functional modules to complete all or part of the functions described above.
  • the node provided in the foregoing embodiment and the method embodiment for transmitting data belong to the same concept. For the specific implementation process, please refer to the method embodiment, which will not be repeated here.
  • the embodiment of the present application further provides a computer-readable storage medium, which stores instructions, which when the computer-readable storage medium runs on a node, causes the node to execute the above-mentioned data transmission method.
  • the embodiment of the present application also provides a computer program product containing instructions, which when running on a node, causes the node to execute the above-mentioned data transmission method.
  • an embodiment of the present application provides a system for transmitting data.
  • the system includes a first node and a second node, and the first node and the second node are used to execute the foregoing data transmission method.
  • the computer program product includes one or more computer instructions, and when the computer program instructions are loaded and executed on a server or a terminal, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a server or a terminal, or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (such as a floppy disk, a hard disk, and a magnetic tape), an optical medium (such as a digital video disk (Digital Video Disk, DVD), etc.), or a semiconductor medium (such as a solid-state hard disk, etc.).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

La présente invention se rapporte au domaine technique des communications sans fil et concerne un procédé de transmission de données, un nœud et un support de stockage. Le procédé comprend les étapes suivantes : lorsque des données sont envoyées en parallèle dans un réseau PLC, un premier nœud peut diffuser un message d'indication simultané, le message d'indication simultané comprenant un intervalle de temps de transmission pour transmettre des données en parallèle; puis le premier nœud peut sélectionner un ensemble de nœuds pour une transmission simultanée, et envoie uniquement une notification de transmission de données à chaque nœud de l'ensemble de nœuds, la notification de transmission de données étant utilisée pour indiquer que chaque nœud de l'ensemble de nœuds envoie des données vers l'extérieur à partir d'un point de temps cible dans l'intervalle temps de transmission. L'adoption de la présente invention peut améliorer le débit de transmission du réseau PLC.
PCT/CN2019/128413 2019-05-30 2019-12-25 Procédé de transmission de données, nœud et support de stockage WO2020238190A1 (fr)

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