CN112019239B

CN112019239B - Method, node and storage medium for transmitting data

Info

Publication number: CN112019239B
Application number: CN201910465652.5A
Authority: CN
Inventors: 曾焱; 王祥
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2021-11-19
Anticipated expiration: 2039-05-30
Also published as: WO2020238190A1; CN112019239A

Abstract

The application provides a data transmission method, a node and a storage medium, and belongs to the technical field of power line communication. The method comprises the following steps: when data is transmitted in parallel in the PLC network, the first node may broadcast a concurrency indication message, where the concurrency indication message includes a transmission time slot for transmitting the data in parallel, and then the first node may select a set of nodes for concurrent transmission, and transmit a data transmission notification only to each node in the set of nodes, where the data transmission notification is used to instruct each node in the set of nodes to transmit the data outward from a target time point in the transmission time slot. By the adoption of the method and the device, the transmission rate of the PLC network can be improved.

Description

Method, node and storage medium for transmitting data

Technical Field

The present application relates to the field of power line communications technologies, and in particular, to a method, a node, and a storage medium for transmitting data.

Background

The Power Line Communication (PLC) technology mainly uses a widely existing copper Power line as a transmission medium, and performs data transmission by using a low-frequency baseband signal. The power lines do not belong to exclusive communication lines and are connected in parallel in one area, so that the PLC network looks at a point-to-multipoint shared medium network from the communication point, and therefore, only one pair of PLC nodes are allowed to carry out communication transmission at the same time.

In the related art, in order to increase the total communication bandwidth of a PLC network, a Multiple-Input Multiple-Output (MIMO) technology is implemented in the PLC network, and the PLC MIMO technology uses a home-deployed live line (L), a zero line (N), and a ground line (PE) to generate two parallel data paths, so that the number of the data paths between two nodes is changed from one path (L-N) to two paths (L-N and L-N common mode-PE), and the rate is doubled.

The application scenario of the PLC MIMO technology is that three power lines (a live line, a zero line and a ground line) are utilized to perform space division multiplexing between two nodes, two data paths are simultaneously established, and the performance of doubling the Single Input Single Output (SISO) mode speed is achieved. With the increasing demand for bandwidth growth in home networks and corporate networks, the transmission rate of PLC networks is still further increasing.

Disclosure of Invention

In order to further increase the transmission rate of the PLC network, embodiments of the present application provide a method, a node, and a storage medium for transmitting data. The technical scheme is as follows:

in a first aspect, a method for transmitting data is provided, and is applied to a power line communication PLC network, and the method includes:

a first node broadcasts a concurrency indication message, wherein the concurrency indication message comprises a transmission time slot for transmitting data in parallel; the first node selects a set of nodes for concurrent transmission, the first node only sends a data transmission notification to each node in the set of nodes, the data transmission notification is used for instructing each node in the set of nodes to send data outwards from a target time point in the transmission time slot.

According to the scheme shown in the embodiment of the application, when a certain condition is met, the first node can determine to initiate parallel transmission, can generate a concurrency indication message, determines a transmission time slot of parallel transmission data, and adds the transmission time slot to the concurrency indication message. The first node may then broadcast a concurrency indication message over the PLC channel. The first node determines all nodes available for concurrent transmission in the PLC network when broadcasting the concurrency indication message, or determines all nodes available for concurrent transmission in the PLC network after broadcasting the concurrency indication message. After the first node selects the node set for concurrent transmission, a data transmission notification may be generated or a pre-stored data transmission notification may be acquired, and the data transmission notification is sent only to each node in the node set, but not to nodes outside the node set. The node receiving the data transmission notification may start to send data to the outside at a target time point of the transmission time slot, and the node not receiving the data transmission notification in the PLC network does not perform data transmission in the transmission time slot.

Therefore, the first node can control all the nodes in the node set to transmit data at the same time point, and the number of the nodes in the node set is not limited, so that the total bandwidth of the PLC network can be increased.

In a possible implementation, the target time point is further included in the concurrent indication message; or the data transmission notification further includes the target time point. In this way, several alternative ways of obtaining the starting point in time for the concurrent transmission may be provided.

In a possible implementation manner, the channel for sending the data transmission notification is any one of a Wireless-Fidelity (Wi-Fi) channel, a visible light channel, an ethernet channel, a coax channel, and a PLC channel.

In a possible implementation, the second node sends the data outwards through a data frame;

the method further comprises the following steps: before the sending time of the next data frame, the first node sends a first time indication message to the second node through a first channel, wherein the first time indication message is used for indicating the sending time of the next data frame; or, before the sending time of the second data frame in the transmission timeslot, the first node sends a second time indication message to each node, where the second time indication message is used to indicate the sending time of other data frames except the first data frame in the transmission timeslot.

According to the scheme shown in the embodiment of the application, the sending time of each data frame can be sent before the sending of the data frame, or the sending times of other data frames except for the first data frame can be sent to each node together before the sending time of the second data frame. Thus, the transmission time of each data frame is indicated, and the transmission time of the data frame can be more accurate.

In one possible embodiment, the selecting, by the first node, a set of nodes for concurrent transmission includes: the first node selects a node set for concurrent transmission according to the transmission rate between the nodes which can be used for concurrent transmission and the nodes which receive data in the PLC network; or the first node selects a node set for concurrent transmission according to the transmission rate between the node which can be used for concurrent transmission in the PLC network and the first node; or the first node selects a node set for concurrent transmission according to the type of a channel used for sending the data transmission notification between the node capable of being used for concurrent transmission in the PLC network and the first node; or the first node selects a node set for concurrent transmission according to the characteristics of the service flow.

According to the scheme shown in the embodiment of the application, when the first node determines to initiate the concurrent transmission, all nodes capable of being used for the concurrent transmission in the PLC network to which the first node belongs can be determined, and all nodes capable of being used for the concurrent transmission can be configured in the first node in advance. The first node may then obtain the transmission rates between all nodes that are available for concurrent transmission and the node that receives the data, which may be preconfigured in the first node. The first node may select a certain number of nodes from all nodes capable of being used for concurrent transmission to form a node set for concurrent transmission.

Or, when determining to initiate the concurrent transmission, the first node may determine that all nodes capable of performing the concurrent transmission in the PLC network to which the first node belongs, and all nodes capable of performing the concurrent transmission may be configured in the first node in advance. Then, the first node may obtain a transmission rate between the preconfigured first node and each node for concurrent transmission, and select a certain number of nodes to form a node set for concurrent transmission.

Or, when determining to initiate the concurrent transmission, the first node may determine that all nodes capable of performing the concurrent transmission in the PLC network to which the first node belongs, and all nodes capable of performing the concurrent transmission may be configured in the first node in advance. The first node may then obtain a type of the first channel between the preconfigured first node and each node for concurrent transmission. And selecting the nodes with the type of the first channel being Wi-Fi from all the nodes capable of being used for concurrent transmission by using the type of the first channel to form a node set used for concurrent transmission. Or selecting nodes of which the type of the first channel is visible light to form a node set for concurrent transmission. Or, among various types of nodes of the first channel, the nodes are respectively selected to form a node set for concurrent transmission.

Or after the first node receives the data, the characteristics of the data, that is, the characteristics of the traffic flow, may be determined, and then if the characteristics of the traffic flow are voice call or video call, according to the characteristics of the traffic flow, it is indicated that the timeliness of the traffic flow is relatively high, so a node of the type of ethernet (high transmission rate) for transmitting the first channel is selected to form a node set for concurrent transmission. If the data is web page data, the timeliness of the service flow is lower, and nodes of which the type of the first channel is WIFI (low transmission rate) can be selected to form a node set for concurrent transmission.

In this way, the node set for concurrent transmission can be accurately selected.

In a possible implementation manner, the first node determines a target number of nodes 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 the nodes with the maximum transmission rate among the nodes capable of being used for concurrent transmission in the PLC network, and the nodes with the target number, which have the unique reversible matrix with the channel matrix from the first node to the nodes for receiving data, to form a node set for concurrent transmission.

In the solution shown in the embodiment of the present application, the first node may determine the target number of the node used for concurrent transmission this time, where the target number may be greater than or equal to the number of the nodes receiving data. And then, in the nodes which can be used for concurrent transmission in the PLC network, the transmission rates between each node and the node for receiving data are sequenced from large to small. And determining a channel matrix between each node and the node from the first node to the node for receiving data, judging whether the channel matrix has a unique reversible matrix, selecting the nodes with the maximum transmission rate and the target number of the nodes with the unique reversible matrix in the channel matrix, and forming a node set for concurrent transmission. Therefore, the node with the higher transmission rate is selected, so that the data is quickly transmitted to the node receiving the data.

In a possible implementation manner, the first node determines a target number of nodes for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data, and selects, from the nodes that can be used for concurrent transmission in the PLC network, the target number of nodes having a maximum transmission rate with the first node and having a unique reversible matrix with a channel matrix from the first node to the node receiving data, to form a node set for concurrent transmission.

In the solution shown in the embodiment of the present application, the first node may determine the target number of the node used for concurrent transmission this time, where the target number may be greater than or equal to the number of the nodes receiving data. And then, sequencing the transmission rates of each node and the first node from large to small in the nodes which can be used for concurrent transmission in the PLC network. And determining a channel matrix between each node and the node from the first node to the node for receiving data, judging whether the channel matrix has a unique reversible matrix, selecting the nodes with the maximum transmission rate and the target number of the nodes with the unique reversible matrix in the channel matrix, and forming a node set for concurrent transmission. Thus, the node with the larger transmission rate is selected, so that the data is quickly sent to the node for concurrent transmission.

In a possible implementation manner, the first node determines a 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 in the nodes that can be used for concurrent transmission in the PLC network, the first node selects the target number of nodes that are the same as a type of a channel used for sending the data transmission notification between the first nodes and have a unique reversible matrix with a channel matrix from the first node to the node receiving data, and forms a node set used for concurrent transmission.

In the solution shown in the embodiment of the present application, the first node may determine the target number of the node used for concurrent transmission this time, where the target number may be greater than or equal to the number of the nodes receiving data. And then determining the type of a channel used for sending a data transmission notice between each node and a first node in the nodes capable of being used for concurrent transmission in the PLC network, determining a channel matrix from each node to the node receiving data from the first node, judging whether the channel matrix has a unique reversible matrix, selecting a target number of nodes with the same type of the channel and the unique reversible matrix in the channel matrix, and forming a node set used for concurrent transmission. In this way, since nodes of the same type of channel are selected, the first node can be synchronized as much as possible with the node data transmission in the node set.

In a possible implementation manner, the first node determines a target number of nodes for concurrent transmission this time, where the target number is greater than or equal to the number of nodes receiving data; determining a target type corresponding to the characteristics of the service flow sent to the node receiving the data according to the corresponding relation between the characteristics of the service flow and the types of the channels; and selecting the target number of nodes from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission, wherein the type of a channel between the target number of nodes and the first node is the target type, and a unique reversible matrix exists in a channel matrix between the target number of nodes and the first node to the node for receiving data.

In the solution shown in the embodiment of the present application, the first node may determine the target number of the node used for concurrent transmission this time, where the target number may be greater than or equal to the number of the nodes receiving data. Then, the first node may obtain a correspondence between the stored characteristics of the service flow and the type of the channel, and then determine, in the correspondence, a target type corresponding to the characteristics of the service flow sent to the node that receives the data. And determining a channel matrix between each node and the node from the first node to the node receiving the data, and judging whether the channel matrix has a unique reversible matrix. And then determining nodes with the type of a channel between the first node and the first node as a target type in the nodes capable of being used for concurrent transmission in the PLC network, selecting a target number of nodes from the nodes, wherein the channel matrixes of the selected target number of nodes have unique reversible matrixes, and forming the selected nodes into a node set. In this way, data transmission efficiency can be made higher since the selected node is selected to be more matched to the traffic flow.

In one possible embodiment, the first node broadcasts a concurrency indication message, including: if a first node determines that data is sent to a plurality of nodes, the first node broadcasts and sends an indication message; or, if the first node determines to transmit data to a plurality of nodes at the maximum rate, the first node broadcasts a concurrency indication message; or, if the first node determines to send the data to the plurality of nodes with the lowest delay, the first node broadcasts a concurrency indication message; or, if the first node determines that a channel for sending a data transmission notification to which a node for concurrent transmission is connected is idle, the first node broadcasts a concurrent indication message.

Therefore, the concurrent transmission is initiated when the conditions are met, and the transmission resources can be saved.

In a second aspect, a method for transmitting data is provided, and is applied to a PLC network for power line communication, and the method includes:

a second node receives a concurrency indication message broadcasted by a first node, wherein the concurrency indication message comprises a transmission time slot for transmitting data in parallel, and the second node is any one node in a node set selected by the first node and used for concurrent transmission; and after the second node receives the data transmission notification sent by the first node, transmitting the received data from the target time point in the transmission time slot.

According to the scheme shown in the embodiment of the application, any node (which may be referred to as a second node in the following) in the node set may receive the concurrency indication message broadcast by the first node, obtain the concurrency time slot from the concurrency indication message, and after receiving the data transmission notification, may send data to the outside at the target time point of the transmission time slot, so that a plurality of nodes in the node set send data at the same time, and may implement concurrent data.

In one possible embodiment, the method further comprises: acquiring the target time point from the concurrent indication message; or, the target time point is obtained from the concurrently transmitted configuration message of the second node; or, the target time point is obtained from a data transmission notification sent by the first node.

In this way, the second node can be made to determine a starting point in time for the concurrent transmission of data.

In a third aspect, a node for transmitting data is provided, the node comprising a processor, a receiver and a transmitter, wherein,

a transmitter for broadcasting a concurrency indication message, wherein the concurrency indication message includes a transmission slot for transmitting data in parallel;

a processor configured to select a set of nodes for concurrent transmission;

a transmitter configured to transmit a data transmission notification only to each node within the set of nodes, the data transmission notification being configured to instruct each node within the set of nodes to transmit data outward in the transmission timeslot from a target point in time.

In a possible implementation, each node sends data to the outside through a data frame; a transmitter, further to: before the sending time of the next data frame, sending a first time indication message to each node, wherein the first time indication message is used for indicating the sending time of the next data frame; or, before the sending time of the second data frame in the transmission timeslot, sending a second time indication message to each node, where the second time indication message is used to indicate the sending time of other data frames except the first data frame in the transmission timeslot.

In one possible implementation, a processor is configured to: selecting a node set for concurrent transmission according to the transmission rate between the nodes capable of being used for concurrent transmission and the nodes receiving data in the PLC network; or, according to the transmission rate between the node capable of being used for concurrent transmission in the PLC network and the first node, selecting a node set for concurrent transmission; or, according to the type of a channel used for sending the data transmission notification between the node capable of being used for concurrent transmission in the PLC network and the first node, selecting a node set used for concurrent transmission; or, according to the characteristics of the service flow, selecting a node set for concurrent transmission.

In one possible implementation, a processor is configured to: determining the target number of nodes for concurrent transmission at this time, wherein the target number is greater than or equal to the number of nodes for receiving data; and selecting the target number of nodes which have the maximum transmission rate with the nodes receiving the data and have unique reversible matrixes with the channel matrix from the first node to the nodes receiving the data from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In one possible implementation, a processor is configured to: determining the target number of nodes for concurrent transmission at this time, wherein the target number is greater than or equal to the number of nodes for receiving data; and selecting the target number of nodes which have the maximum transmission rate with the first node and have unique reversible matrixes with a channel matrix from the first node to the node for receiving data from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In one possible implementation, a processor is configured to: determining the target number of nodes for concurrent transmission at this time, wherein the target number is greater than or equal to the number of nodes for receiving data; and selecting the nodes with the target number, which have the same type as a channel used for sending the data transmission notification between the first nodes and have a unique reversible matrix with a channel matrix from the first nodes to the nodes for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In one possible implementation, a processor is configured to: determining the target number of nodes for concurrent transmission at this time, wherein the target number is greater than or equal to the number of nodes for receiving data; determining a target type corresponding to the characteristics of the service flow sent to the node receiving the data according to the corresponding relation between the characteristics of the service flow and the types of the channels; and selecting the target number of nodes from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission, wherein the type of a channel between the target number of nodes and the first node is the target type, and a unique reversible matrix exists in a channel matrix between the target number of nodes and the first node to the node for receiving data.

In one possible embodiment, the transmitter is configured to: broadcasting a concurrency indication message if it is determined that data is transmitted to a plurality of nodes; or, if it is determined that data is transmitted to the plurality of nodes at the maximum rate, broadcasting a concurrency indication message; or if the data is determined to be sent to the plurality of nodes according to the lowest delay, broadcasting a concurrency indication message; or, if it is determined that a channel for transmitting a data transmission notification to which a node for concurrent transmission is connected is idle, broadcasting a concurrent indication message.

In a fourth aspect, a node for transmitting data is provided, where the node is applied to a PLC network in power line communication, and the node includes a processor, a transmitter, and a receiver, where:

a receiver, configured to receive a concurrency indication message broadcasted by a first node, where the concurrency indication message includes a transmission timeslot for transmitting data in parallel, and the second node is any node in a node set selected by the first node for concurrent transmission;

a transmitter configured to transmit the received data from a target time point in the transmission timeslot after receiving a data transmission notification sent by the first node.

In one possible implementation, the processor is further configured to: acquiring the target time point from the concurrent indication message; or, the target time point is obtained from the concurrently transmitted configuration message of the second node; or, the target time point is obtained from a data transmission notification sent by the first node.

In a fifth aspect, a node for transmitting data is provided, where the node includes one or more modules, and the one or more modules implement the method for transmitting data provided in the first aspect by executing instructions.

In a sixth aspect, a node for transmitting data is provided, and the node includes one or more modules, and the one or more modules implement the method for transmitting data provided in the second aspect by executing instructions.

In a seventh aspect, a computer-readable storage medium is provided, which stores instructions that, when executed on a first node, cause the first node to perform the method for transmitting data provided in the first aspect.

In an eighth aspect, a computer-readable storage medium is provided, which stores instructions that, when executed on a second node, cause the second node to perform the method for transmitting data provided in the second aspect.

In a ninth aspect, there is provided a computer program product comprising instructions which, when run on a node, cause the node to perform the method of transmitting data as provided in the first and second aspects above.

In a tenth aspect, a system for transmitting data is provided, the system comprising a first node and a second node, wherein,

the first node, a node for transmitting data as described in the fifth aspect; the second node is a node for transmitting data as described in the sixth aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

in this embodiment, when data is sent in parallel in a PLC network, a first node may broadcast a concurrency indication message, where the concurrency indication message includes a transmission timeslot for transmitting data in parallel, then the first node may select a node set for concurrent transmission, and send a data transmission notification only to each node in the node set, where the data transmission notification is used to instruct each node in the node set to send data outwards from a target time point in the transmission timeslot, and each node in the node set may receive the concurrency indication message broadcast by the first node, and after receiving the data transmission notification sent by the first node, transmit the received data from the target time point in the transmission timeslot. Therefore, the first node can control all the nodes in the node set to transmit data at the same time point, and the number of the nodes in the node set is not limited, so that the transmission rate of the PLC network can be increased.

Moreover, by parallel transmission, spatial multiplexing is essentially utilized, simultaneous communication to a plurality of downlink nodes can be achieved, and communication delay caused by Time Division Multiple Access (TMDA) network scheduling is greatly reduced.

Drawings

Fig. 1 is a schematic view of a PLC network according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a node according to an embodiment of the present application;

fig. 3 is a schematic flowchart of a method for transmitting data according to an embodiment of the present application;

fig. 4 is a schematic diagram of a frame format of a data frame according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a method for transmitting data according to an embodiment of the present application;

fig. 6 is a schematic diagram of transmission data provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a node for transmitting data according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a node for transmitting data according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a node for transmitting data according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

To facilitate understanding of the embodiments of the present application, a system architecture related to the embodiments of the present application and concepts related to the terms are first described below.

The embodiment of the present application may be applied to a PLC network, and in the PLC network, a plurality of nodes may be included, where one node is configured as a management node (the management node may also be referred to as a Domain Master (DM)). As shown in fig. 1, the system comprises 4 nodes, where a node 1 is a management node, and any two nodes may be connected through a PLC channel.

The embodiment of the application relates to two application scenarios, namely, a scenario I, in a PLC network, a management node can subsequently participate in concurrent transmission, and the management node can be used for connecting an access network.

In the second scenario, in the PLC network, the management node is only used for managing other nodes, and does not participate in concurrent transmission.

It should be noted that the above-mentioned other nodes are used for controlling the transmission time slots used by the other nodes for concurrent transmission, and for controlling when the other nodes start concurrent transmission, etc.

The embodiment of the application provides a method for transmitting data, wherein an execution main body of the method can be a node, and the node can be a power line terminal device (power line modem).

Fig. 2 shows a block diagram of a node in the embodiment of the present application, where the node may be a first node mentioned later or a second node mentioned later. The node may comprise at least a receiver 201, a processor 202, a memory 203 and a transmitter 204. Wherein the receiver 201 may be used for receiving data, the transmitter 204 may be used for transmitting data, the memory 203 may be used for storing software programs and modules, and the processor 202 executes various functional applications and data processing by operating the software programs and modules stored in the memory 203. The memory 203 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the node, and the like. Further, the memory 203 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 203 may also include a memory controller to provide the processor 202, receiver 201, and transmitter 204 access to the memory 203. The processor 202 is a control center of the node, connects various parts of the entire node by various interfaces and lines, performs various functions of the node and processes data by running or executing software programs and/or modules stored in the memory 203, and calling data stored in the memory 203, thereby performing overall monitoring of the node.

Optionally, processor 202 may include one or more processing cores; preferably, the processor 202 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 202.

As shown in fig. 3, the present application provides a method for transmitting data, which is applied to a PLC network under the first scenario, and a processing flow of the method may be as follows:

in step 301, the first node broadcasts a concurrency indication message, wherein the concurrency indication message includes a transmission slot for transmitting data in parallel.

In an implementation, when a certain condition is satisfied, the first node may determine to initiate parallel transmission, may then generate a concurrency indication message, determine a transmission slot for parallel transmission of data, and add the transmission slot to the concurrency indication message. The first node may then broadcast a concurrency indication message over the PLC channel, which may be received as long as the links between nodes in the PLC network are not broken, since the concurrency indication message is transmitted by broadcast.

It should be noted that, for scenario one, the first node is a management node, and data to be sent to the PLC network all passes through the first node, and the first node may determine the data amount to be sent to the node receiving the data this time, and determine the transmission time slot based on the data amount, where generally, the larger the data amount is, the longer the transmission time slot is. For example, the corresponding relationship between the data size range and the transmission time slot may be stored, and the first node may determine the data size range to which the data size sent to the node receiving the data belongs, and determine the transmission time slot corresponding to the data size range, that is, the transmission time slot mentioned in step 301. The start time point of the transmission slot may be a time that is a certain time after the broadcast concurrency indication message.

Optionally, in this embodiment of the present application, there are multiple ways that may initiate the concurrent transmission and broadcast the concurrent indication message, and four possible implementations are given below:

the first method is as follows: the first node broadcasts a concurrency indication message if the first node determines that data is sent to multiple nodes.

In implementation, the first node serves as a management node, and may determine the received data and the node to be sent to (the received data may carry an identifier of the node to be sent to), so that the first node may determine the number of the node to be sent according to the node to be sent to, and if the number is greater than or equal to 2, may determine to initiate a concurrent transmission, and may broadcast a concurrent indication message. In this way, since concurrent transmission is not initiated, and only data of one node can be transmitted at a time, the efficiency of transmitting data is low, and therefore, when data is transmitted to a plurality of nodes, the data can be rapidly transmitted to the node receiving the data through concurrent transmission.

The second method comprises the following steps: the first node broadcasts a concurrency indication message if the first node determines to send data to the plurality of nodes at the maximum rate.

In implementation, the first node, as a management node, may determine the received data, the node to which the data is to be sent, and the type of the received data, and then determine the transmission rate corresponding to the type of the received data by using the stored correspondence between the type and the transmission rate. And if the obtained transmission rate is the maximum transmission rate in the corresponding relation, determining to transmit the data according to the maximum rate. In this way, it may be determined that data is to be transmitted to multiple nodes at a maximum transmission rate, it may be determined that concurrent transmission is to be initiated, and a concurrency indication message may be broadcast. Therefore, the data can be transmitted to a plurality of nodes through concurrent transmission, so that the data can be rapidly transmitted to the plurality of nodes.

The third method comprises the following steps: the first node broadcasts a concurrency indication message if the first node determines to send data to the plurality of nodes with the lowest delay.

In implementation, the first node, as a management node, may determine the received data, the node to which the data is to be sent, and the type of the received data, and then determine the transmission delay corresponding to the type of the received data by using the correspondence between the stored type and the transmission delay. And if the obtained transmission delay is the lowest transmission delay in the corresponding relation, determining to transmit the data according to the lowest delay. And the first node can determine the number of the nodes to be sent according to the nodes to be sent, and if the number is greater than or equal to 2, the nodes to be sent can be determined, so that the data can be determined to be sent to the nodes according to the lowest transmission delay, the concurrent transmission can be determined to be initiated, and the concurrent indication message can be broadcast. In this way, data can be transmitted to a plurality of nodes by concurrent transmission, so that delay can be reduced.

The method is as follows: if the first node determines that a channel for sending a data transmission notification to which the node for concurrent transmission is connected is idle, the first node broadcasts a concurrency indication message.

In implementation, the first node, as a management node, may determine whether all channels for sending a notification of data transmission between nodes capable of concurrent transmission connected to the first node are transmitting data, and if not, may determine that the channels are idle, may determine to initiate concurrent transmission, and may broadcast a concurrency indication message. In this way, it can be guaranteed that only one group of nodes is transmitting data in parallel in the same transmission slot.

Optionally, the concurrency indication message further includes a frame number, a frame interval between data frames, a number of redundant symbols, and a number of symbols per frame.

Wherein, the frame interval refers to the time interval of data frame transmission, the number of redundant symbols indicates that there are several head symbols, etc., and the number of symbols of each frame refers to the number of symbols included in each data frame. For example, as shown in fig. 4, P, H denotes a redundancy symbol, and D denotes a symbol for transmitting data.

In this way, nodes which subsequently transmit data in parallel can use the contents in the concurrency indication message to transmit the received data in parallel.

In step 302, the first node selects a set of nodes for concurrent transmission.

In an implementation, the first node may determine all nodes available for concurrent transmission in the PLC network when broadcasting the concurrency indication message, or determine all nodes available for concurrent transmission in the PLC network after broadcasting the concurrency indication message.

Then, the first node may select, from all nodes that may be used for concurrent transmission, nodes that are used for concurrent transmission this time, which form a node set.

Optionally, there are multiple ways to select a node for concurrent transmission, and the application provides the following four processing ways:

the first method is as follows: the first node selects a node set for concurrent transmission according to a transmission rate between a node capable of being used for concurrent transmission and a node receiving data in the PLC network.

In implementation, when determining to initiate the concurrent transmission, the first node may determine that all nodes capable of performing the concurrent transmission in the PLC network to which the first node belongs, and all nodes capable of performing the concurrent transmission may be configured in the first node in advance. The first node may then obtain the transmission rates between all nodes that are available for concurrent transmission and the node that receives the data, which may be preconfigured in the first node.

The first node may select a certain number of nodes from all nodes capable of being used for concurrent transmission to form a node set for concurrent transmission.

Optionally, a node with a high transmission rate may be selected, and the corresponding processing may be as follows:

the first node determines the target number of the nodes used for concurrent transmission at this time, wherein the target number is greater than or equal to the number of the nodes for receiving data, and the first node selects the nodes with the target number, which have the maximum transmission rate with the nodes for receiving data and the unique reversible matrix with a channel matrix from the first node to the nodes for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network, so as to form a node set for concurrent transmission.

In an implementation, the first node may determine a target number of nodes for concurrent transmission this time, where the target number may be greater than or equal to the number of nodes receiving data. And then, in the nodes which can be used for concurrent transmission in the PLC network, the transmission rates between each node and the node for receiving data are sequenced from large to small. And determining a channel matrix between each node and the node from the first node to the node for receiving data, judging whether the channel matrix has a unique reversible matrix, selecting the nodes with the maximum transmission rate and the target number of the nodes with the unique reversible matrix in the channel matrix, and forming a node set for concurrent transmission.

The second method comprises the following steps: and the first node selects a node set for concurrent transmission according to the transmission rate between the nodes which can be used for concurrent transmission in the PLC network and the first node.

In implementation, when determining to initiate the concurrent transmission, the first node may determine that all nodes capable of being used for the concurrent transmission in the PLC network to which the first node belongs, and all nodes capable of being used for the concurrent transmission may be configured in the first node in advance. Then, the first node may obtain a transmission rate between the preconfigured first node and each node for concurrent transmission, and select a certain number of nodes to form a node set for concurrent transmission.

Optionally, a node with a higher transmission rate than the first node may be selected, and the corresponding processing may be as follows:

the first node determines the target number of the nodes used for concurrent transmission at this time, wherein the target number is greater than or equal to the number of the nodes for receiving data, and the first node selects the nodes with the target number, which have the maximum transmission rate with the first node and have the unique reversible matrix with a channel matrix from the first node to the nodes for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network, so as to form a node set for concurrent transmission.

In an implementation, the first node may determine a target number of nodes for concurrent transmission this time, where the target number may be greater than or equal to the number of nodes receiving data. And then, sequencing the transmission rates of each node and the first node from large to small in the nodes which can be used for concurrent transmission in the PLC network. And determining a channel matrix between each node and the node from the first node to the node for receiving data, judging whether the channel matrix has a unique reversible matrix, selecting the nodes with the maximum transmission rate and the target number of the nodes with the unique reversible matrix in the channel matrix, and forming a node set for concurrent transmission.

The third method comprises the following steps: and the first node selects a node set for concurrent transmission according to the type of a first channel between the nodes which can be used for concurrent transmission in the PLC network and the first node.

In implementation, when determining to initiate the concurrent transmission, the first node may determine that all nodes capable of being used for the concurrent transmission in the PLC network to which the first node belongs, and all nodes capable of being used for the concurrent transmission may be configured in the first node in advance. The first node may then obtain a type of the first channel between the preconfigured first node and each node for concurrent transmission. And selecting the nodes with the type of the first channel being Wi-Fi from all the nodes capable of being used for concurrent transmission by using the type of the first channel to form a node set used for concurrent transmission. Or selecting nodes of which the type of the first channel is visible light to form a node set for concurrent transmission. Or, among various types of nodes of the first channel, the nodes are respectively selected to form a node set for concurrent transmission.

Optionally, nodes with the same type of channel may be selected to form a node set, and corresponding processing may be as follows:

the first node determines the target number of the nodes used for concurrent transmission at this time, wherein the target number is greater than or equal to the number of the nodes for receiving data, and the first node selects the nodes with the target number, which have the same type as a channel used for sending a data transmission notification between the first node and the nodes for receiving data and have a unique reversible matrix with a channel matrix between the first node and the nodes for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In an implementation, the first node may determine a target number of nodes for concurrent transmission this time, where the target number may be greater than or equal to the number of nodes receiving data. And then determining the type of a channel used for sending a data transmission notice between each node and a first node in the nodes capable of being used for concurrent transmission in the PLC network, determining a channel matrix from each node to the node receiving data from the first node, judging whether the channel matrix has a unique reversible matrix, selecting a target number of nodes with the same type of the channel and the unique reversible matrix in the channel matrix, and forming a node set used for concurrent transmission.

It should be noted here that the invertible matrix of the channel matrix between each node and the first node to the node receiving the data is assumed to be unique. If the maximum number of the nodes with the same type of the channel is smaller than the target number, selecting the maximum number of the nodes with the same type of the channel (which can be called as a first number for convenience in description later), and selecting a second number of the nodes with the same type of the channel from the nodes which can be used for concurrent transmission in the rest of the PLC network (the second number is equal to the target number minus the first number), and forming the nodes selected twice into a node set. For example, if the target number is 5 and the maximum number of nodes with the same type of channel is 3, then 2 nodes with the same type of channel are selected from the remaining nodes capable of being used for concurrent transmission in the PLC network, and the previously selected 3 nodes and the subsequently selected 2 nodes are combined into a node set.

The method is as follows: and the first node selects a node set for concurrent transmission according to the characteristics of the service flow.

In implementation, after the first node receives the data, the characteristics of the data, that is, the characteristics of the traffic flow, may be determined, and then according to the characteristics of the traffic flow, if the characteristics of the traffic flow are voice call and video call, the timeliness of the traffic flow is relatively high, so a node of the type ethernet (high transmission rate) to transmit the first channel is selected to form a node set for concurrent transmission. If the data is web page data and the timeliness of the service flow is lower, the node of which the type of the first channel is Wi-Fi (low transmission rate) can be selected to form a node set for concurrent transmission.

Optionally, the service flow characteristics may be used to determine the type of the channel first, and then select a node set for concurrent transmission, and the corresponding processing may be as follows:

the method comprises the steps that a first node determines the target number of nodes used for concurrent transmission at this time, wherein the target number is larger than or equal to the number of nodes used for receiving data, the target type corresponding to the characteristics of a service flow sent to the nodes used for receiving the data is determined according to the corresponding relation between the characteristics of the service flow and the type of a channel, the nodes used for concurrent transmission in a PLC network are selected to form a node set used for concurrent transmission, the type of the channel between the nodes with the target number and the first node is the target type, and a unique reversible matrix exists between the nodes with the target number and the channel matrix from the first node to the nodes used for receiving the data.

In an implementation, the first node may determine a target number of nodes for concurrent transmission this time, where the target number may be greater than or equal to the number of nodes receiving data. Then, the first node may obtain a correspondence between the stored characteristics of the service flow and the type of the channel, and then determine, in the correspondence, a target type corresponding to the characteristics of the service flow sent to the node that receives the data. And determining a channel matrix between each node and the node from the first node to the node receiving the data, and judging whether the channel matrix has a unique reversible matrix. And then determining nodes with the type of a channel between the first node and the first node as a target type in the nodes capable of being used for concurrent transmission in the PLC network, selecting a target number of nodes from the nodes, wherein the channel matrixes of the selected target number of nodes have unique reversible matrixes, and forming the selected nodes into a node set.

It should be further noted that, when the node set is selected, it is satisfied that a unique reversible matrix exists in a channel matrix between a node in the node set and a node from the first node to the node receiving data, because the precoding matrix mentioned later is an inverse of the channel matrix, if the channel matrix does not exist the unique reversible matrix, then the obtained precoding matrix is not unique, and then the concurrent data is not successful.

In step 303, the first node sends a data transmission notification only to each node in the node set, where the data transmission notification is used to instruct each node in the node set to send data outwards from the target time point in the transmission time slot.

In an implementation, after determining the node set, the first node may send the data transmission notification only to each node in the node set, and does not send the data transmission notification to nodes other than the node set in the PLC network, so that a node that receives the data transmission notification may send data outwards from a target time point in a transmission timeslot, and a node that does not receive the data transmission notification does not send data in the transmission timeslot, so that a node that does not receive the data transmission notification does not affect parallel sending of data.

Optionally, the first node and each node in the node set establish a first channel, and for any node in the node set (which may be referred to as a second node in the following description), the first node may send a data transmission notification to the second node through the first channel between the first node and the second node. The first channel is a channel between the first node and the second node except for a common PLC channel, 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. When the first channel is a PLC channel, the transmission rate of the PLC channel is higher and is larger than that of a common PLC channel. The above-mentioned first node sending the data transmission notification to the second node may be carried in the data when sending the data requiring the transmission of the second node to the second node in the first channel established with the second node, and sending the data together to the second node.

Optionally, after determining the transmission timeslot, the first node may determine a target time point, which may be a time point of a certain duration after the transmission timeslot starts, or a start time point of the transmission timeslot, and may carry the target time point in the transmission timeslot, or carry the target time point in the data transmission notification.

Optionally, a difference between the transmission rate of the first channel and the transmission rate of the PLC channel is greater than a second threshold.

The second threshold is generally larger, and 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 transmission rate from the first node to the node receiving the data. Therefore, the data can be rapidly sent to the second node from the first node without influencing the concurrent data transmission of the second node in the transmission time slot.

Optionally, the data sent out by the second node is sent through a data frame, and the first node may indicate a sending time for sending a next data frame, and the corresponding processing may be as follows:

and before the transmission time of the next data frame, the first node transmits a first time indication message to the second node, wherein the time indication message is used for indicating the transmission time of the next data frame.

In an implementation, before the sending time of the next data frame, the first node may send a first time indication message (which may be sent from the first channel) to the second node, where the first time indication message may be carried in the sent data when the last data frame sends data. In this way, the second node can acquire the sending time of the next data frame from an adjacent data frame before the data frame to be sent, and further, it can be ensured that the time points of each concurrent node for concurrent data at each time are the same.

Optionally, the data sent out by the second node is sent through data frames, and the first node may indicate the sending time of each data frame, and the corresponding processing may be as follows:

and 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, wherein the second time indication message is used for indicating the sending time of other data frames except the first data frame in the transmission time slot.

In an implementation, before a transmission time of a second data frame (for example, in a transmission slot, a data frame 1, a data frame 2, and a data frame 3 are sequentially transmitted, where the data frame 2 is the second data frame, and the data frame is the first data frame), the first node may transmit a second time indication message (which may be transmitted through the first channel) to each node, where the second time indication message may be a time rule (for example, may be 5n milliseconds, where n denotes a data frame that is transmitted several times in the transmission slot of the data frame, and n is greater than 1, so that a transmission time of a data frame that is transmitted 2 nd is 5 × 2 milliseconds), or may be a transmission time of each data frame in the transmission slot except the first data frame.

Optionally, data sent by any node in the node set is sent by a first node, and the following description takes the example that the first node sends the first data to a second node in the node set, where there are multiple ways for the first node to send data to the second node, and two possible implementations are given below:

in the first mode, 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. And 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 notice. The second node transmits the frequency domain data of the first data from the target time point in the transmission slot.

In an implementation, the first node may determine, in data to be transmitted (data to be received by the receiving node), data to be transmitted by the second node (which may be referred to as first data later, and how to determine the data later), and the first node may transmit a message to the second node, where the message is used to instruct to acquire the bit allocation table, the forward error correction code, and the code rate of the second node. After receiving the configuration information, the second node may obtain its 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 (which may be sent through a channel for sending a data transmission notification, that is, through the first channel). After receiving the precoding matrix, the first node may acquire the precoding matrix, and then perform precoding processing on first data concurrently transmitted by the second node using the precoding matrix, the bit allocation table, the forward error correction code, and the code rate, which are sent by the second node, to obtain frequency domain data of the first data. The first node then transmits the frequency domain data of the first data to the second node through the first channel.

In this way, after receiving the frequency domain data of the first data sent by the first node, the second node can directly send the frequency domain data of the first data at the target time point of the transmission time slot without processing, and the processing resource of the second node can be saved.

In the second mode, the first node sends bit data of data to be sent to the second node through a channel for sending a data transmission notification. The second node receives bit data of data to be sent, which is sent by the first node through a channel for sending a data transmission notification, the second node performs precoding processing on the bit data to obtain frequency domain data of the first data sent by the second node, and the second node starts to transmit the frequency domain data of the first data from a target time point in a transmission time slot.

In an implementation, a first node may determine data to be transmitted (all data received by a node receiving the data), and the first node may transmit a precoding matrix to a second node (which may be transmitted over a channel used to transmit a 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 notice.

After receiving the configuration information, the second node may obtain its own bit allocation table, forward error correction code, and code rate. And then, precoding the bit data of the data to be transmitted by using the precoding matrix, the bit allocation table of the precoding matrix, the forward error correction code and the code rate to obtain the frequency domain data of the first data transmitted by the precoding matrix (here, the frequency domain data transmitted by other concurrent nodes can also be obtained). The second node may then send out the frequency domain data of the first data, which may be through a PLC channel established between the node receiving the data and the second node.

It should be noted that, in the first manner, the first node processes the data, and the second node does not need to process the data, so that the processing resource of the second node can be saved, and the processing resource of the first node is occupied. In the second mode, the first node does not process the data, and the second node processes the data, so that the processing resources of the first node can be saved, and the processing resources of the second node are occupied. When the first node sends the frequency domain data of the first data to the second node, the first node can carry the identifier of the node for receiving the data, so that the second node can use the identifier to determine the node to which the first data is sent, and directly sends the frequency domain data of the first data to the node to which the first data is sent. Similarly, when the first node sends the bit data of the data to be sent to the second node, the first node may also carry the identifier of the node that receives the data, so that the second node may use the identifier to determine the node to which the first data is to be sent, and directly send the frequency domain data of the first data to the node to which the first data is to be sent. In addition, the identification of the receiving node may be carried in a header of a data frame.

In addition, in the embodiment of the present application, a method for determining the precoding matrix is further provided:

assuming that the first node initiates concurrent transmission with the second node in the set of nodes and that the nodes receiving the data are a1 and a2, the first node and the second node send orthogonally modulated reference symbols to a1 and a2 consecutively over two symbols (the number depends on the estimated channel matrix size):

a1 and A2 can respectively feed back and receive signals Y transmitted by the first node and the second node_refTo the firstAnd (3) node:

thus, H may be introduced by addition of a group Y_refOn the basis of multiplying right by X_refThe inverse of (c) yields:

H＝Y_refX_ref ^-1 (3)

the H obtained in equation (3) is a channel matrix, and the inverse of the channel matrix H is a precoding matrix.

In addition, in the embodiment of the present application, a reason why the node receiving the data can receive the correct data is also given, and here, the first node and the second node send the data in parallel, and the nodes receiving the data are a1 and a 2.

Assuming that X1 and X2 are the data that needs to be sent to A1 and A2, channel H is the channel between the first and second nodes and the two nodes receiving the data:

after obtaining H through a channel training mechanism, the first node may determine a corresponding precoding matrix P (the following is a feasible way, a direct zero forcing algorithm):

data X received by two nodes receiving data, i.e. A1 receiving X₁A2 receives X₂：

After the pre-coding processing, the following steps are performed:

then the data sent by the first node is P₁₁X₁+P₂₁X₂The data sent by the second node is P₁₂X₁+P₂₂X₂The signals received by the two nodes receiving data are Y:

thus, A1 may receive X₁A2 can receive X₂。

It should be noted that, when there are multiple nodes receiving data, the data concurrently transmitted by each node performing concurrent transmission is different, and after precoding, each node performing concurrent transmission transmits one row in the matrix after precoding, where data transmitted by the first node in equation (7) is P₁₁X₁+P₂₁X₂The data sent by the second node is P₁₂X₁+P₂₂X₂。

In addition, in this embodiment of the present application, a manner in which any node (which may be referred to as a second node in the following) in the node set executes concurrent processing is also provided, as shown in fig. 5, the steps may be as follows:

step 501, a second node receives a concurrency indication message broadcasted by a first node, wherein the concurrency indication message comprises a transmission time slot for transmitting data in parallel, and the second node is any one node in a node set selected by the first node and used for transmitting data in parallel.

In an implementation, a second node in the node set may receive a concurrency indication message broadcasted by the first node, and parse a transmission timeslot for transmitting data in parallel from the concurrency indication message.

Step 502, after the second node receives the data transmission notification sent by the first node, the received data is transmitted from the target time point in the transmission time slot.

In an implementation, the second node may receive the data transmission notification sent by the first node, and after receiving the data transmission notification, may obtain a target time point, where the target time point belongs to the transmission timeslot. And then transmits the received data from the target time point in the transmission slot.

Optionally, the second node may parse the concurrency indication message to obtain the transmission time slots for transmitting data in parallel after step 502.

Optionally, the second node may obtain the target time point in multiple ways, and three possible ways are given as follows:

the first method is as follows: and acquiring the target time point from the concurrency indication message.

In implementation, when the first node sends the concurrency indication message, the target time point is added in the concurrency indication message, and after the second node receives the concurrency indication message, the target time point can be obtained through analysis, so that the target time point can be obtained.

The second method comprises the following steps: and acquiring the target time point from the concurrently transmitted configuration information of the second node.

In an implementation, the technician may configure the concurrently transmitted configuration information in the second node, where the configuration information may include the target time point, and store the configuration information in the second node. And the subsequent second node acquires the target time point from the stored configuration information. For example, the target time point is 2 milliseconds after the start of the transmission slot. As another example, the target time point is a start time point of the transmission slot.

The third method comprises the following steps: and acquiring the target time point from the data transmission notice sent by the first node.

In an implementation, when sending the data transmission notification to the second node, the first node may add the target time point to the data transmission notification, and send the data transmission notification to the second node together with the target time point. The subsequent second node may acquire the target time point from the data transmission notification.

Optionally, the second node may receive the data transmission notification sent by the first node through a first channel, where the first channel is a channel between the second node and the first node, and the channel is any one of a Wi-Fi channel, a visible light channel, an ethernet channel, a coax channel, and a PLC channel. When the first channel is a PLC channel, the transmission rate of the PLC channel is higher and is larger than that of a common 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.

Optionally, the second node transmits the received data from the target time point in the transmission time slot through a second channel (a common PLC channel established between the second node and the node receiving the data), and the first node transmits the data from the target time point in the transmission time slot through the second channel between itself and the node receiving the data. Wherein, the second channel is a PLC channel. In order to more clearly display the first channel and the second channel, a transmission diagram is given, as shown in fig. 6, the first node sends a data transmission notification to the second node at other time before the transmission time slot, and the first node sends data at the target time point of the transmission time slot and the second node at the same time.

In addition, after receiving the data, the node receiving the data may send an acknowledgement message to the node sending the data if the decoding is successful. If successful decoding is not possible, a non-acknowledgement message may be sent to the node sending the data. In addition, a time point at which the acknowledgement message or the non-acknowledgement message is transmitted may be configured by a protocol. For example, after receiving the data, the node receiving the data may immediately feed back an acknowledgement message to the node sending the data.

In addition, the second node may receive the first time indication message or the second time indication message sent by the first node, and if the first time indication message is received, the second node may obtain a sending time of a next data frame from the first time indication message, and may send the next data frame from the sending time. If the second time indication message is received, the sending time of each data frame after the target time point can be obtained from the second time indication message, or the sending time of each data frame after the target time point can be calculated according to the time rule.

In addition, when the first node does not send the first time indication message or the second time indication message to the second node, a sending time interval of each data frame may be configured in advance in the second node, and the second node may send one data frame at every time interval.

In addition, in the embodiment of the present application, for a case where a node receiving data is single, enhancement may be implemented by using the scheme of the present application, and the description may be as follows:

in beamforming, the first node is a management node and concurrently transmits data, the second node is a node where the first node transmits data in parallel, and if data is transmitted only to node a3, the source data transmitted by the first node and the source data transmitted by the second node are the same and are both X₁At this time, 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 as follows:

in equation (9), H represents a channel between the first node and the second node and a3, and P represents a precoding matrix.

Note that the principle of the precoding matrix P in calculation is to maximize the power of the signal received by the node receiving the data.

It should be noted that the number of nodes receiving data is different from a plurality of nodes: the node receiving the data does not need to reply the confirmation message to all the concurrent transmission nodes, and the node receiving the data only needs to reply the confirmation message to the first node.

The application provides a data transmission method, which is applied to a PLC network in the second scene, and the method is different from the method applied to the PLC network in the first scene:

the first node does not participate in the concurrent transmission and serves only to manage all nodes in the PLC network, including broadcasting the concurrency indication message, the set of nodes selected for concurrent transmission.

In scenario two, one node (which may be referred to as a target node) may be configured to receive data outside the PLC network, and after the target node receives the data outside the PLC network, the target node may send the data amount of the data, the type of the data, and the identification of the node receiving the data to the first node. A first channel is established between the target node and each node which can be used for concurrent transmission in the PLC network.

The first node may select a set of nodes for concurrent transmission among the nodes for concurrent transmission based on the amount of data the target node sends data, the type of data, and the identity of the node receiving the data. A data transmission notification is then sent to each node in the set of nodes. Or, here, the first node may send the identifier of each node in the node set to the target node, and after the target node receives the identifier, the target node may determine the node corresponding to the received identifier of the node, and send the data transmission notification to the nodes through the first channel established with the nodes.

The target node may send data to a second node in the node set, which may be a second channel (normal PLC channel) established by the channel with the nodes, and requires the second node to transmit the data concurrently. Here, there may be two ways to send data, which is similar to the process of sending the first data from the first node to the second node, and is not described here again.

In scenario two, other processing is similar to that in scenario one, and is not described here again.

And by parallel transmission, spatial multiplexing is essentially utilized, simultaneous communication of a plurality of downlink nodes can be achieved, and communication delay caused by TMDA network scheduling is greatly reduced.

Fig. 7 is a structural diagram of a node for transmitting data according to an embodiment of the present application. The node may be implemented as part or all of a node in software, hardware, or a combination of both. The node provided in the embodiment of the present application may implement the process described in fig. 3 in the embodiment of the present application, where the node includes: a sending module 710 and a determining module 720, wherein:

a sending module 710, configured to broadcast a concurrency indication message, where the concurrency indication message includes a transmission timeslot for transmitting data in parallel, and specifically may implement the sending function in step 301;

a determining module 720, configured to select a node set for concurrent transmission, which may specifically implement the determining function in step 302 and its implicit step;

the sending module 710 is further configured to send a data transmission notification only to each node in the node set, where the data transmission notification is used to instruct each node in the node set to send data outwards from a target time point in the transmission timeslot, and specifically, the sending function in step 303 and its implicit step may be implemented;

wherein the second node is any one node in the node set.

In a possible implementation manner, 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.

In a possible implementation, each node sends data to the outside through a data frame;

the sending module 710 is further configured to:

before the sending time of the next data frame, sending a first time indication message to each node, wherein the first time indication message is used for indicating the sending time of the next data frame; or,

and sending a second time indication message to each node before the sending time of a second data frame in the transmission time slot, wherein the second time indication message is used for indicating the sending time of other data frames except the first data frame in the transmission time slot.

In a possible implementation, the determining module 720 is configured to:

selecting a node set for concurrent transmission according to the transmission rate between the nodes capable of being used for concurrent transmission and the nodes receiving data in the PLC network; or,

selecting a node set for concurrent transmission according to a transmission rate between a node capable of being used for concurrent transmission in the PLC network and the first node; or,

selecting a node set for concurrent transmission according to the type of a channel used for sending the data transmission notification between the node capable of being used for concurrent transmission in the PLC network and the first node; or,

and selecting a node set for concurrent transmission according to the characteristics of the service flow.

In a possible implementation, the determining module 720 is configured to:

determining the target number of nodes for concurrent transmission at this time, wherein the target number is greater than or equal to the number of nodes for receiving data;

and selecting the target number of nodes which have the maximum transmission rate with the nodes receiving the data and have unique reversible matrixes with the channel matrix from the first node to the nodes receiving the data from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In a possible implementation, the determining module 720 is configured to:

and selecting the target number of nodes which have the maximum transmission rate with the first node and have unique reversible matrixes with a channel matrix from the first node to the node for receiving data from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In a possible implementation, the determining module 720 is configured to:

and selecting the nodes with the target number, which have the same type as a channel used for sending the data transmission notification between the first nodes and have a unique reversible matrix with a channel matrix from the first nodes to the nodes for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

In a possible implementation, the determining module 720 is configured to:

determining a target type corresponding to the characteristics of the service flow sent to the node receiving the data according to the corresponding relation between the characteristics of the service flow and the types of the channels;

and selecting the target number of nodes from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission, wherein the type of a channel between the target number of nodes and the first node is the target type, and a unique reversible matrix exists in a channel matrix between the target number of nodes and the first node to the node for receiving data.

In a possible implementation manner, the sending module 710 is configured to:

broadcasting a concurrency indication message if it is determined that data is transmitted to a plurality of nodes; or,

broadcasting a concurrency indication message if it is determined that data is transmitted to the plurality of nodes at the maximum rate; or,

if the data are determined to be sent to the plurality of nodes according to the lowest delay, broadcasting a concurrency indication message; or,

if it is determined that a channel for transmitting a data transmission notification to which a node for concurrent transmission is connected is idle, a concurrency indication message is broadcast.

In a possible implementation, the target time point is further included in the concurrent indication message; or the data transmission notification further includes the target time point.

Fig. 8 is a structural diagram of a node that transmits data according to an embodiment of the present application. The node may be implemented as part or all of a node in software, hardware, or a combination of both. The node provided in the embodiment of the present application may implement the process described in fig. 3 in the embodiment of the present application, where the node includes: a receiving module 810 and a transmitting module 820, wherein:

a receiving module 810, configured to receive a concurrency indication message broadcasted by a first node, where the concurrency indication message includes a transmission timeslot for transmitting data in parallel, and the second node is any node in a node set selected by the first node and used for concurrent transmission, and specifically may implement the receiving function in step 501 and its implicit step;

a sending module 820, configured to start to transmit the received data from the target time point in the transmission timeslot after the second node receives the data transmission notification sent by the first node, where the sending function in step 502 and the implicit step thereof may be specifically implemented.

In a possible implementation, as shown in fig. 9, the node further includes an obtaining module 830 configured to:

acquiring the target time point from the concurrent indication message; or,

acquiring the target time point from the concurrently transmitted configuration message of the second node; or,

and acquiring the target time point from the data transmission notice sent by the first node.

It should be noted that: in the node provided in the foregoing embodiment, when transmitting data, only the division of the functional modules is illustrated, and in practical applications, the functions may be allocated to different functional modules according to needs, that is, the internal structure of the node is divided into different functional modules to complete all or part of the functions described above. In addition, the node and the method for transmitting data provided by the above embodiments belong to the same concept, and the specific implementation process thereof is described in detail in the method embodiments and is not described herein again.

Optionally, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores instructions, and when the computer-readable storage medium is run on a node, the node is caused to execute the above method for transmitting data.

Optionally, an embodiment of the present application further provides a computer program product containing instructions, which when run on a node, causes the node to execute the above method for transmitting data.

Optionally, an embodiment of the present application provides a system for transmitting data, where the system includes a first node and a second node, and the first node and the second node are configured to execute the method for transmitting data.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any combination thereof, and when the implementation is realized by software, all or part of the implementation may be realized in the form of a computer program product. The computer program product comprises one or more computer program instructions which, when loaded and executed on a server or terminal, cause the processes or functions described in accordance with embodiments of the application to be performed, 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, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optics, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium can be any available medium that can be accessed by a server or a terminal or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (such as a floppy Disk, a hard Disk, a magnetic tape, etc.), an optical medium (such as a Digital Video Disk (DVD), etc.), or a semiconductor medium (such as a solid state Disk, etc.).

The above description is only one embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for transmitting data is applied to a Power Line Communication (PLC) network, and comprises the following steps:

a first node broadcasts a concurrency indication message, wherein the concurrency indication message comprises a transmission time slot for transmitting data in parallel;

the first node selects a set of nodes for concurrent transmission;

the first node sending a data transmission notification only to each node within the set of nodes, the data transmission notification instructing each node within the set of nodes to send data out in the transmission time slot starting from a target time point;

the target time point is carried in the concurrent indication message, or the target time point is carried in the data transmission notification, or the target time point is carried in a concurrent configuration message, and the target time points sent to each node in the node set are the same.

2. The method according to claim 1, wherein 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.

3. The method according to claim 1 or 2, wherein each node sends data out through data frames;

the method further comprises the following steps:

before the sending time of the next data frame, the first node sends a first time indication message to each node, wherein the first time indication message is used for indicating the sending time of the next data frame; or,

and before the sending time of a second data frame in the transmission time slot, the first node sends a second time indication message to each node, wherein the second time indication message is used for indicating the sending time of other data frames except the first data frame in the transmission time slot.

4. The method of claim 1, wherein the first node selects a set of nodes for concurrent transmission, comprising:

the first node selects a node set for concurrent transmission according to the transmission rate between the nodes which can be used for concurrent transmission and the nodes which receive data in the PLC network; or,

the first node selects a node set for concurrent transmission according to the transmission rate between the nodes which can be used for concurrent transmission in the PLC network and the first node; or,

the first node selects a node set for concurrent transmission according to the type of a channel used for sending the data transmission notification between the node which can be used for concurrent transmission in the PLC network and the first node; or,

and the first node selects a node set for concurrent transmission according to the characteristics of the service flow.

5. The method of claim 4, wherein the first node selecting a set of nodes for concurrent transmission based on a transmission rate between nodes in the PLC network available for concurrent transmission and nodes receiving data comprises:

the first node determines the target number of nodes for concurrent transmission at this time, wherein the target number is greater than or equal to the number of nodes for receiving data;

and the first node selects the nodes with the maximum transmission rate among the nodes capable of being used for concurrent transmission in the PLC network, and the nodes with the target number, which have the unique reversible matrix with the channel matrix from the first node to the nodes for receiving data, to form a node set for concurrent transmission.

6. The method of claim 4, wherein the first node selecting a set of nodes for concurrent transmission based on a transmission rate between the first node and nodes available for concurrent transmission in the PLC network comprises:

and the first node selects the nodes with the maximum transmission rate and the target number, which have the unique reversible matrix with the channel matrix from the first node to the node receiving the data, from the nodes which can be used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

7. The method of claim 4, wherein the first node selects the set of nodes for concurrent transmission according to a type of a channel used for sending a data transmission notification between the node capable of concurrent transmission in the PLC network and the first node, and comprising:

and the first node selects the nodes with the target number, which have the same type as a channel used for sending the data transmission notification between the first nodes and have a unique reversible matrix with a channel matrix from the first node to the node for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

8. The method of claim 4, wherein the first node selects a set of nodes for concurrent transmission according to characteristics of a traffic flow, comprising:

9. The method of any of claims 1, 2 and 4 to 8, wherein the first node broadcasts a concurrency indication message comprising:

if a first node determines that data is sent to a plurality of nodes, the first node broadcasts and sends an indication message; or,

if a first node determines to send data to a plurality of nodes at a maximum rate, the first node broadcasts a concurrency indication message; or,

if a first node determines to send data to a plurality of nodes according to the lowest delay, the first node broadcasts a concurrency indication message; or,

the first node broadcasts a concurrency indication message if the first node determines that a channel for sending a data transmission notification to which a node for concurrent transmission is connected is idle.

10. A method for transmitting data is applied to a Power Line Communication (PLC) network, and comprises the following steps:

a second node receives a concurrency indication message broadcasted by a first node, wherein the concurrency indication message comprises a transmission time slot for transmitting data in parallel, and the second node is any one node in a node set selected by the first node and used for concurrent transmission;

after the second node receives the data transmission notification sent by the first node, the second node starts to transmit the received data from a target time point in the transmission timeslot, where the target time point is obtained from the concurrent indication message, or the target time point is obtained from the data transmission notification, or the target time point is obtained from a configuration message of concurrent transmission of the second node, and the target time points obtained by any node in the node set are the same.

11. A node for transmitting data, wherein the node is applied to a PLC network for power line communication, and the node comprises:

a sending module, configured to broadcast a concurrency indication message, where the concurrency indication message includes a transmission timeslot for transmitting data in parallel;

a determining module for selecting a set of nodes for concurrent transmission;

the sending module is further configured to send a data transmission notification only to each node in the node set, where the data transmission notification is used to instruct each node in the node set to send data outwards from a target time point in the transmission timeslot;

12. The node of claim 11, wherein each node sends data out via data frames;

the sending module is further configured to:

13. The node of claim 11, wherein the determining module is configured to:

selecting a node set for concurrent transmission according to the transmission rate between the first node and the node which can be used for concurrent transmission in the PLC network; or,

14. The node of claim 13, wherein the determining module is configured to:

and selecting the nodes with the target number, which have the maximum transmission rate with the nodes for receiving the data and have the unique reversible matrix with the channel matrix from the first node to the nodes for receiving the data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

15. The node of claim 13, wherein the determining module is configured to:

and selecting the nodes with the target number, which have the maximum transmission rate with a first node and have a unique reversible matrix with a channel matrix from the first node to the node for receiving data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

16. The node of claim 13, wherein the determining module is configured to:

and selecting the nodes with the target number, which have the same type as a channel used for sending the data transmission notification between the first node and the nodes for receiving the data and have a unique reversible matrix with a channel matrix from the first node to the nodes for receiving the data, from the nodes capable of being used for concurrent transmission in the PLC network to form a node set for concurrent transmission.

17. The node according to any of claims 11 to 16, wherein said sending module is configured to:

if data are determined to be sent to a plurality of nodes, broadcasting and sending a concurrent indication message; or,

if the data are determined to be sent to the plurality of nodes according to the maximum rate, broadcasting a concurrency indication message; or,

18. A node for transmitting data, wherein the node is applied to a PLC network for power line communication, and the node comprises:

a receiving module, configured to receive a concurrency indication message broadcasted by a first node, where the concurrency indication message includes a transmission timeslot for transmitting data in parallel, and the node for transmitting data is any node in a node set selected by the first node and used for concurrent transmission;

a sending module, configured to, after receiving a data transmission notification sent by the first node, start to transmit the received data from a target time point in the transmission timeslot, where the target time point is obtained from the concurrent indication message, or the target time point is obtained from the data transmission notification, or the target time point is obtained from a configuration message of concurrent transmission of a second node, and the target time points obtained by any node in the node set are the same.

19. A computer-readable storage medium having stored thereon instructions which, when run on a node, cause the node to perform the method of any one of claims 1-10.