CN112422156B - Low-voltage power line communication multi-local area network fusion method based on network scale - Google Patents
Low-voltage power line communication multi-local area network fusion method based on network scale Download PDFInfo
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Abstract
The invention discloses a low-voltage power line communication multi-local area network fusion method based on network scale, which comprises the following steps: s1: each gateway judges the number of online nodes and offline nodes in each local area network; s2: each gateway periodically sends beacon frames to nodes in each local area network respectively; s3: if a node in one local area network receives a beacon frame sent by a node in another local area network, judging the network scale of the local area network in which the node is positioned according to the respective beacon frame; s4: performing a network dissolving operation on a local area network with a small network scale; s5: accessing the nodes in the dispersed local area network into the local area network with large network scale; s6: steps S1-S5 are repeated until all lans are merged into a single network-wide lan. The invention can rapidly and autonomously merge local area networks with smaller specifications in the area, and realize rapid networking of the networks in the area.
Description
Technical Field
The invention relates to the field of power distribution network communication, in particular to a low-voltage power line communication multi-local area network fusion method based on network scale.
Background
With the shortage of fossil energy and the increasing pressure of environmental protection, renewable energy will become a main supply source of human energy. However, the characteristics of the renewable energy sources (wind power, photovoltaic power generation, etc.), the imbalance between the energy collection/utilization, and the regional imbalance, etc., severely restrict the large-scale use of the renewable energy sources.
In order to solve a plurality of problems caused by the fact that renewable energy is connected to a traditional power grid in a large scale, people put forward related concepts such as a micro-grid, a smart grid and an energy internet. As a future energy supply platform, the electric power energy internet (hereinafter referred to as energy internet) has attracted wide attention all over the world, and its advantages have been gradually recognized by academia and industry. Although no authoritative definition exists at present, the vital signs of the energy Internet such as 'intelligence and self-learning' and the like determine that the energy Internet is a CPS (Cyber Physical System). The energy Internet is used as a high integration body of information infrastructure and electric power infrastructure, and a communication network platform of the energy Internet is an important component of the CPS.
The energy internet is represented by a wide-area 'backbone network' (transmission network), an regional 'access network' (distribution network) and a local 'local area network' (user network) on a multi-space scale, as shown in fig. 1. In a low-voltage distribution network of an access network of a region, various electrical load devices have high dynamic topological variability, so that the energy Internet has multi-scale dynamics, and the data processing capacity in the communication network is greatly increased. Currently, communication technologies used in low voltage distribution networks include optical fiber communication, power line carrier communication (broadband and narrowband), RS485/232, and micro-power wireless communication, etc. The power line saves a communication professional cable, and directly utilizes the existing power distribution network as an energy, information and control integrated network platform, thereby realizing the same-network transmission of electric power and information in a real sense.
Compared with other communication technologies, the low-voltage power line communication technology has many advantages, but the communication reliability is the main reason that the current application is limited and questioned. The complexity of the power line communication channel environment and the sharing, openness and diversity of the communication medium environment are essential reasons that lead to poor reliability of the power line communication system. For power line communication, merely improving the high reliability of point-to-point communication between nodes does not mean that the high reliability of communication of the whole network can be improved, and it is only the basis and precondition for the reliability of the network. In order to achieve the communication reliability of the network, a fast and effective networking method needs to be provided. However, in an actual working condition (that is, the number of nodes is relatively large, or the distance between nodes is relatively long, or the channel environment is suddenly deteriorated, etc.), the problem of coexistence of multiple networks may occur in ad hoc networks performed by nodes in an area, and the stability and rapidity of networking are seriously affected. Therefore, a suitable multi-network convergence method is proposed to ensure reliable Communication between nodes, which will become a leading issue of a low-voltage PLC (Power Line Communication), and has great theoretical and practical significance.
The publication number is 2016-02-17, and the publication number is CN105337638A, and discloses a power line communication multi-subnet fusion method based on subnet quantities. Because the child nodes in different quasi-spider subnets can regularly send beacon frames to the nodes in the communication range, if the child node in another quasi-spider subnet receives the beacon frame, the node needs to compare the size of the MAC (local area network Address, which is called Media Access Control Address in english) Address of the quasi-spider subnet, and fuses the child nodes in the quasi-spider subnet with the large MAC Address of the master node, the quasi-spider subnet with the small MAC Address of the master node disperses the child nodes, and the dispersed nodes are added into the network one by one in a way that new nodes are registered and added into the network until all the nodes are added into the network. However, under the working conditions of large number of nodes, long distance between nodes, sudden deterioration of channel environment and the like, the prior art has many problems. Under the condition that the nodes are distributed unevenly in different areas, the method provided by the existing file is adopted to perform network fusion, so that the resolving time of a local area network with a large scale is too long, the time required by final network fusion (namely networking) is too long, and the networking efficiency of the whole area is seriously influenced.
However, most of the research at home and abroad at present is the ad hoc network method of a single network in a certain specific area, and the research on the mutual fusion method among a plurality of networks in different areas is relatively less, the essential reason is that the mutual fusion mechanism of the plurality of networks is relatively complex, and the fusion technology proposed at present has the following problems:
1. at present, some scholars have proposed a subnet fusion method, which explicitly indicates the fusion direction of the network, and can implement network fusion between subnets according to a feasible fusion method. However, if the nodes are distributed unevenly in the whole area, a local network with a smaller scale (i.e., a smaller number of nodes) appears when the nodes perform networking in their respective areas, and performing network fusion according to the existing subnet fusion method will result in a longer network fusion time, which seriously affects the networking time of all the nodes in the whole area.
2. Nodes in different areas are built into a plurality of different local area networks, so that a plurality of main nodes (namely gateways) exist in the whole area. At the present stage, the proposed method has fewer consideration factors (i.e., limiting conditions) for converging a plurality of master nodes into a single master node, which results in longer master node convergence time and lower network convergence efficiency, and is not beneficial to the master node to manage and maintain all nodes in the whole area.
3. In the process of network mutual fusion at the present stage, because the crossed public nodes among networks can receive networking beacon frames sent by the hidden terminal, the nodes receive the beacon frames in the local network and have frame collision, the received beacon frames fail to be received, and the local area network in the area is difficult to realize fast fusion.
Disclosure of Invention
The invention provides a low-voltage power line communication multi-local area network fusion method based on network scale, which can be used for rapidly and efficiently fusing different local area networks into a single network.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a low-voltage power line communication multi-local area network fusion method based on network scale comprises the following steps:
s1: each gateway judges the number of online nodes and offline nodes in each local area network;
s2: each gateway periodically transmits a beacon frame to a node in each local area network, and the beacon frame has two functions. The first function is to discover unregistered child nodes in the area and realize the registration and network access of the nodes; the second function is to judge whether other local area networks exist outside the whole local network;
s3: if a node in one local area network receives a beacon frame sent by a node in another local area network, judging the network scale of the local area network in which the node is positioned according to the respective beacon frame;
s4: performing a network dissolving operation on a local area network with a small network scale;
s5: accessing the nodes in the dispersed local area network into the local area network with large network scale;
s6: steps S1-S5 are repeated until all lans are merged into a single network-wide lan.
Preferably, in step S1, the gateway determines the number of online nodes and offline nodes in each local area network, and specifically includes:
the nodes in the local area network regularly transmit heartbeat frames to the gateway through the proxy, the gateway replies an ACK frame after receiving the heartbeat frames, and the gateway can judge the number of the on-line nodes and the off-line nodes through a handshaking mechanism of the heartbeat frames and the heartbeat frames.
Preferably, the beacon frame in step S2 includes the network identifier of each local area network and the network size of each local area network.
Preferably, the local area network identifier is a logical address of a local area network gateway.
Preferably, the network size of the local area network is the number of nodes registered to the network.
Preferably, after step S2 and before step S3, after the nodes of the local area network periodically send out beacon frames, if no intra-network isolated node is found, it indicates that all the nodes in the area are registered to enter the local area network.
Preferably, the step S4 is to perform a dissolving operation on the network of the local area network with a small network size, specifically:
s4.1: after the network scale is compared, the local area network with the large network scale autonomously creates a network dispersed data frame and sends the network dispersed data frame to nodes in the local area network with the small network scale in a broadcasting mode;
s4.2: after receiving the network dispersed data frame, the nodes in the local area network with small network scale adopt initialization and reset operation to disconnect the logical link connection between the nodes.
Preferably, in step S4.2, after the node in the local area network with a small network size receives the network disassembled data frame, the node randomly delays and self-schedules the network disassembled data frame to find other nodes in the communication range.
Preferably, in step S5, for the nodes in the disassembled lan, accessing the lan and adding the nodes into the lan with a large network scale, specifically:
s5.1: after receiving the beacon frame sent by the node of the local area network with large network scale, the node which has performed the reset operation joins the local area network with large network scale in an indirect registration network access mode.
Preferably, after receiving the beacon frame transmitted by the node in the large-scale local area network, the node that has performed the reset operation in step S5.1 self-schedules the network-released data frame to find other nodes in the communication range at random delay.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a low-voltage power line communication multi-local area network fusion method based on network scale, which intelligently identifies the scale degree of each network in an area, rapidly and autonomously fuses local area networks with smaller specifications in the area, and realizes rapid networking of the networks in the area; the invention converges a plurality of main nodes in different local area networks towards the main node with large local area network scale, and finally converges the main nodes of a plurality of different local area networks into a single main node after the local area networks with smaller different scale and the network with large scale are merged into a local area network, thereby being more beneficial to all sub-nodes in the main node management area; the method can reduce the collision probability of a plurality of beacon frames received by the common node among the plurality of local area networks, improve the fusion efficiency of the plurality of local area networks, and realize the aim of rapid fusion of the plurality of local area networks in the area. Meanwhile, the method has strong universality and is suitable for popularization and application in other fields such as energy Internet, ubiquitous power Internet of things, smart homes, vehicle-mounted entertainment systems and the like.
Drawings
Fig. 1 is a schematic diagram of an energy internet structure.
FIG. 2 is a schematic flow chart of the method of the present invention.
Fig. 3 is a schematic diagram of network convergence in the embodiment.
Fig. 4 is a schematic diagram of a network resolution process of the lan 1 in the embodiment.
Fig. 5 is a schematic flowchart of the node registering in the lan 2 according to the embodiment.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described with reference to the drawings and the embodiments.
Example 1
The embodiment provides a low-voltage power line communication multi-local area network convergence method based on network scale, as shown in fig. 2, including the following steps:
s1: each gateway judges the number of online nodes and offline nodes in each local area network;
s2: each gateway periodically sends beacon frames to nodes in each local area network, and the beacon frames play two roles. The first function is to discover unregistered child nodes in the area and realize the registration and network access of the nodes; the second function is to judge whether other local area networks exist outside the whole local area network;
s3: if a node in one local area network receives a beacon frame sent by a node in another local area network, judging the network scale of the local area network in which the node is positioned according to the respective beacon frame;
s4: performing a network dissolving operation on a local area network with a small network scale;
s5: accessing the nodes in the dispersed local area network into the local area network with large network scale;
s6: steps S1-S5 are repeated until all lans are merged into a single network-wide lan.
In step S1, each gateway determines the number of online nodes and offline nodes in each lan, which specifically includes:
the nodes in the local area network regularly transmit heartbeat frames to the gateway through the proxy, the gateway replies an ACK frame after receiving the heartbeat frames, and the gateway can judge the number of the on-line nodes and the off-line nodes through a handshaking mechanism of the heartbeat frames and the heartbeat frames.
In step S2, the beacon frame includes the network identifier of each local area network and the network size of each local area network.
The local area network identifier is a local area network gateway logical address.
The network scale of the local area network is the number of the nodes which are registered to be accessed into the network.
After step S2 and before step S3, after the node of the local area network periodically sends out a beacon frame, if no isolated node in the network is found, it indicates that all the nodes in the area are registered to enter the local area network.
In step S4, performing a dissolving operation on the network of the local area network with a small network size, specifically:
s4.1: after the network scale is compared, the local area network with the large network scale autonomously creates a network dispersed data frame and sends the network dispersed data frame to nodes in the local area network with the small network scale in a broadcasting mode;
s4.2: after receiving the network dispersed data frame, the nodes in the local area network with small network scale adopt initialization and reset operation to disconnect the logical link connection between the nodes.
And S4.2, after the nodes in the local area network with small network scale receive the network scattered data frame, randomly delaying and self-scheduling the network scattered data frame to discover other nodes in the communication range.
In step S5, the nodes in the disassembled lan are accessed to the lan with a large network scale, which specifically includes:
s5.1: after receiving the beacon frame sent by the node of the local area network with large network scale, the node which has performed the reset operation joins the local area network with large network scale in an indirect registration network access mode.
After the node which has performed the reset operation in step S5.1 receives the beacon frame sent by the node of the local area network with a large network scale, the node randomly delays and self-schedules the network-released data frame to find other nodes in the communication range.
In a specific implementation process, as shown in fig. 3, in two areas, after nodes in area 1 and area 2 use an effective networking method, networking of the nodes in the two areas is completed, and a local area network 1 and a local area network 2 are formed. During the operation and maintenance of the local area network, the child nodes in the local area network need to periodically forward heartbeat frames to the gateway through the proxy. And after receiving the heartbeat frame, the gateway replies an ACK frame. Through the handshake mechanism of the heartbeat frames and the heartbeat frames, the gateway can judge the number of the online nodes (including the number of the offline nodes). In addition, the gateway needs to periodically transmit a beacon frame, which serves two purposes. The first function is to discover unregistered child nodes in the area and realize the registration and network access of the nodes; the second function is to judge whether other local area networks exist outside the whole local area network;
after the nodes in the local area networks 1 and 2 send out beacon frames regularly, if no isolated node in the local area networks is found, the fact that the nodes in the two areas are registered to enter the respective local area networks is indicated. Suppose that, at a certain time, after nodes a and B in the lan 2 receive beacon frames sent by nodes C and D in the lan 1, the beacon frames contain respective logical addresses (i.e., network identifiers) of gateways of the lan, and after comparison, nodes a and B find that the network identifiers stored by themselves are inconsistent with the network identifiers stored by nodes C and D. In addition, the nodes a and B analyze the number of registered nodes (i.e. network sizes) in the beacon frame, and after comparing the information, find that the network size of the nodes a and B are larger, and at this time, the network nodes a and B will acquire the information that other local area networks exist in the whole area except the local network where the nodes a and B are located. In this embodiment, after the two (or more) pieces of local area network information exist in the acquired area, the local area network with the large intelligent identification network scale is adopted as the fusion direction to perform network fusion;
as shown in fig. 4, after acquiring the information that the network scale of the local area network 1 is small, the nodes a and B autonomously create a network de-fragmentation data frame and send the network de-fragmentation data frame to the nodes of the local area network 1 in a broadcast manner. After receiving the network scattered frame, the node of the local area network 1 randomly delays and self-schedules the frame to send to other nodes in the communication range. After receiving the data frame, the nodes adopt initialization and carry out reset operation, and the logical link connection between the nodes is disconnected. By this operation, the network of the local area network 2 can be completed with the operation of disintegration;
as shown in fig. 5, because the nodes in the lan 2 still send beacon frames dynamically during the dispreading process of the lan 1, the nodes C and D (including the nodes that have been reset in other lans 1) that have been reset at this time will join the lan 2 in an indirect registration network access manner after receiving the beacon frames sent by the nodes a and B, respectively, and become child nodes of the lan 2. Similarly, other reset nodes of the lan 1 will also join the lan 2 in the same way, and the end result will be merged into a single lan 1 with a larger network scale. If there are other lans 3, 4, etc. in the area, the manner of network convergence is similar to the manner of nodes in the lan 1.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A low-voltage power line communication multi-local area network fusion method based on network scale is characterized by comprising the following steps:
s1: each gateway judges the number of online nodes and offline nodes in each local area network;
s2: each gateway periodically sends beacon frames to nodes in each local area network respectively;
s3: if a node in one local area network receives a beacon frame sent by a node in another local area network, judging the network scale of the local area network in which the node is positioned according to the respective beacon frame;
s4: performing a network resolving operation on a local area network with a small network scale;
s5: accessing the nodes in the dispersed local area network into the local area network with large network scale;
s6: repeating steps S1-S5 until all LANs are combined into a single LAN with a larger network scale;
in step S2, the beacon frame includes the network identifier of the respective local area network and the network size of the respective local area network.
2. The network scale-based low voltage power line communication multi-lan convergence method of claim 1, wherein in step S1, each gateway determines the number of on-line nodes and off-line nodes in each lan, specifically:
the nodes in the local area network regularly transmit heartbeat frames to the gateway through the proxy, the gateway replies an ACK frame after receiving the heartbeat frames, and the gateway can judge the number of the on-line nodes and the off-line nodes through a handshaking mechanism of the heartbeat frames and the heartbeat frames.
3. The network scale based low voltage powerline communication multi-lan convergence method of claim 1, wherein the lan network identifier is a lan gateway logical address.
4. The network-scale based low-voltage power line communication multi-local area network convergence method as claimed in claim 1, wherein the network scale of the local area network is the number of nodes registered to the network.
5. The method as claimed in claim 1, wherein after step S2 and before step S3, when the nodes in the lan send out beacon frames periodically, if no isolated node in the lan is found, it indicates that all the nodes in the area are registered in the lan.
6. The method for fusing multiple lans of low voltage power line communication based on network scale according to claim 1, wherein the step S4 is to perform a dispergation operation on the small-scale lan network, specifically:
s4.1: after the network scale is compared, the local area network with the large network scale autonomously creates a network dispersed data frame and sends the network dispersed data frame to nodes in the local area network with the small network scale in a broadcasting mode;
s4.2: after receiving the network dispersed data frame, the nodes in the local area network with small network scale adopt initialization and reset operation to disconnect the logical link connection between the nodes.
7. The method according to claim 5, wherein in step S4.2, after the node in the LAN with the smaller network size receives the network de-fragmentation data frame, the node randomly delays and self-schedules the network de-fragmentation data frame to find other nodes in the communication range.
8. The method for merging multiple lans based on network scale according to claim 5, wherein the step S5 is a step of adding the nodes in the disassembled lan into the lan with a large network scale, specifically:
s5.1: after receiving the beacon frame sent by the node of the local area network with large network scale, the node which has performed the reset operation joins the local area network with large network scale in an indirect registration network access mode.
9. The method according to claim 7, wherein the node that has performed the reset operation in step S5.1 randomly delays the self-scheduling of other nodes within the discovery communication range of the network-resolved data frame after receiving the beacon frame transmitted by the node of the large-scale LAN.
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| US6741162B1 (en) * | 2000-10-04 | 2004-05-25 | Conexant Systems, Inc. | Power line networking apparatus and method |
| EP1892843B1 (en) * | 2006-08-24 | 2014-10-01 | Sony Deutschland GmbH | Method for transmitting a signal on a power line network, transmitting unit, receiving unit and system |
| CN103874291A (en) * | 2014-03-04 | 2014-06-18 | 北京世壮物联科技有限公司 | Power line carrier-based intelligent networking control system and method |
| US20160182252A1 (en) * | 2014-12-22 | 2016-06-23 | Greenvity Communications, Inc. | Wireless and Powerline Communication Mesh Network |
| CN105337638B (en) * | 2015-10-16 | 2017-11-17 | 哈尔滨工业大学 | Power line communication plurality of subnets fusion method based on the subnet scale of construction |
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