CN102324953A - Networking method for MAC (media access control) layer of low-voltage network power line carrier communication network - Google Patents
Networking method for MAC (media access control) layer of low-voltage network power line carrier communication network Download PDFInfo
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Abstract
The invention provides a networking method for an MAC (media access control) layer of a low-voltage network power line carrier communication network and relates to the field of power line communication, and the method provided by the invention can be used for solving the problem that in the low-voltage network power line carrier communication network, a terminal user node cannot communicate with a base station. In the method provided by the invention, a bus structure of the MAC layer of a low-voltage network is utilized to divide the MAC layer of the low-voltage network into a novel topology formed by a plurality of single-layer manual spider webs, so that the problem that blind spots exist in the network is solved; in order to avoid data collision caused by a node signal access channel, a waiting time WT is defined; two nodes sequentially send data to a center node at a time interval of WT; and data transmission and processing are performed within respective sub-network ranges, thus the data collision rate in a bus channel at the same moment is reduced, and the utilization rate of the channel is improved; and the method provided by the invention, the meter reading accuracy is improved, and the problem that blind spots exist in an automatic meter reading system is solved. The method provided by the invention is suitable for being used in the process of establishing a communication network of the MAC layer of the low-voltage network power line carrier communication network.
Description
Technical field
The present invention relates to the power line communication field, be specifically related to a kind of method for building up of communication network.
Background technology
The blind spot problem is meant in Automatic meter reading system because the node signal transmitting power is limited, factors such as electric network impedance does not match, interchannel noise cause the power line communication reliability low, the problem that causes the user terminal node not communicate with the base station.The blind spot problem can cause data-bag lost, the re-transmission of data Layer, reduces channel utilization and throughput, reduces the reliability and the accuracy of Automatic meter reading system.
The solution power line communication reliability that exists at present is low to mainly contain following two kinds to improve Automatic meter reading system technology of dependability scheme:
First kind, improve point-to-point communication and correctly receive and dispatch probability.Both at home and abroad the expert mainly concentrates on the research of following several respects: 1) based on the research of physical layer, the researcher is from the reliability of analyzing the electric network impedance matching properties, reduce fading channel, reduce the electric network noise influence, carrying out Fast Channel estimation and modeling, the signal modulation/demodulation methods equal angles of studying high reliability considers to improve power line communication; 2) based on the research of link layer, (media access control, MAC) set out, and improves the communication reliability between the point-to-point by a layer equal angles from chnnel coding and medium access control for the researcher.These class methods to a certain degree with in the certain limit are solving the integrity problem of carrier communication.
Second kind, there are scholar and manufacturer to begin to pay close attention to the reliability that the method for using network layer networking route (relaying) improves the power line communication network aspect.These class methods will based on the Real-time Channel characteristics, dynamically solve the route and the relay problem of network service on the basis of last type of theory and method, be the important model of modern large scale network communication.Power line communication technology research direction and the thinking that solves the power line communication field question can roughly be summarised as content shown in Figure 1.
Summary of the invention
The present invention is in the application layer that solves low-voltage network power line carrier communication network (being Automatic meter reading system); The problem that exists terminal use's node not communicate with the base station provides a kind of network-building method of low-voltage network power line carrier communication network MAC layer.
The network-building method of low-voltage network power line carrier communication network MAC layer, it is realized by following steps:
Data broadcasting is initiated in base station in step 1, the low-voltage network power line carrier communication network; M G node in the MAC layer of low-voltage network power line carrier communication network receives the data broadcasting of base station; And form the n straton net of m-1 limit individual layer spider web logical topology structure at the MAC layer; M is the integer greater than 1, n=1;
The Centroid h of step 4, n straton net
nInitiate data broadcasting once more;
K node receiving center node h in the MAC layer of step 5, low-voltage network power line carrier communication network
nThe data of broadcasting, all nodes that will obtain logic ID are then rejected, and k-m node of remainder formed n+1 straton net, and node of selection is as the Centroid h of this straton net in said n+1 straton net
N+1, said Centroid h
N+1All can directly carry out data communication, this Centroid h with all the other any nodes in the n+1 straton net
N+1To each the node assignment logic ID in the n+1 straton net; Make n=n+1, m=k-m returns execution in step four, and remaining B node is searched for, and all realizes direct communication or trunking traffic with the base station until all nodes, the foundation of communication network in the MAC layer of completion low-voltage network power line carrier communication network; K is the integer greater than m;
The G node for can be directly and the base station carry out the node of point-to-point communication;
The B node is that the influence that receives channel status can not directly communicate with the base station, but can be adjacent the node that node communicates.
In the low-voltage network power line carrier communication network of the present invention, the content of the packet that each node produces comprises: data source nodes ID, this node place subnet number of plies, destination address and data.
In each straton net, the packet that each node produces each node according to the ascending order of logic ID successively is sent to the Centroid of this layer.
In each straton net, the Centroid h of n straton net
nDestination address be the Centroid h of n-1 straton net
N-1The address, when n=1, the Centroid h of ground floor subnet
1Destination address be the address, base station.
In each straton net, each node is identical to the time interval of the Centroid transmission packet of this layer.The communication sequential of each straton net is consistent.
Beneficial effect: the present invention utilizes the logical construction of artificial spider web, has defined the stand-by period, and the time that per two nodes equate is at interval sent data successively; Avoided the node signal access channel to cause data collision; Transfer of data is all carried out in subnet scoping separately with processing, has reduced the data collision rate in the synchronization bus channel, has improved channel utilization and meter reading accuracy; Realize communicating by letter of terminal use's node and base station, solved the blind spot problem that exists in the Automatic meter reading system.
Description of drawings
Fig. 1 is the approach sketch map of the raising power line communication reliability in the background technology; Fig. 2 is the physical topology of bus-type described in an embodiment principle schematic, and mark G is the G node, and mark B is the B node; Fig. 3 is artificial spider web communication logic topology theory sketch map; Fig. 4 is a networking principle schematic of the present invention; Fig. 5 is a MAC layer sequential sketch map.
Embodiment
Embodiment one, combination Fig. 2 to Fig. 5 explain this embodiment, the network-building method of low-voltage network power line carrier communication network MAC layer, and it is realized by following steps:
Data broadcasting is initiated in base station in step 1, the low-voltage network power line carrier communication network; M G node in the MAC layer of low-voltage network power line carrier communication network receives the data broadcasting of base station; And form the n straton net of m-1 limit individual layer spider web logical topology structure at the MAC layer; M is the integer greater than 1, n=1;
The Centroid h of step 4, n straton net
nInitiate data broadcasting once more;
K node receiving center node h in the MAC layer of step 5, low-voltage network power line carrier communication network
nThe data of broadcasting, all nodes that will obtain logic ID are then rejected, and k-m node of remainder formed n+1 straton net, and node of selection is as the Centroid h of this straton net in said n+1 straton net
N+1, said Centroid h
N+1All can directly carry out data communication, this Centroid h with all the other any nodes in the n+1 straton net
N+1To each the node assignment logic ID in the n+1 straton net; Make n=n+1, m=k-m returns execution in step four, and remaining B node is searched for, and all realizes direct communication or trunking traffic with the base station until all nodes, the foundation of communication network in the MAC layer of completion low-voltage network power line carrier communication network; K is the integer greater than m;
The G node for can be directly and the base station carry out the node of point-to-point communication;
The B node is that the influence that receives channel status can not directly communicate with the base station, but can be adjacent the node that node communicates.
In the low-voltage network power line carrier communication network of the present invention, the content of the packet that each node produces comprises: data source nodes ID, this node place subnet number of plies, destination address and data.
In each straton net, the packet that each node produces each node according to the ascending order of logic ID successively is sent to the Centroid of this layer.
In each straton net, the Centroid h of n straton net
nDestination address be the Centroid h of n-1 straton net
N-1The address, when n=1, the Centroid h of ground floor subnet
1Destination address be the address, base station.
In each straton net, each node is identical to the time interval of the Centroid transmission packet of this layer, is WT (Wait Time).Behind data processing time PT (Process Time) PT＞WT, the Centroid h of subnet 1
1With the data in the subnet and by Centroid h
2The data that transmit are sent to the base station.The node communication sequential of the 2nd straton net and the 3rd straton net and the 1st straton net, the 2nd straton net are consistent, Centroid h
2With Centroid h
3Communication sequential and h
1, h
2Sequential consistent, finally all nodes are relaying with the Centroid of place subnet and the Centroid of upper strata subnet, keep and the communicating by letter of base station.
Principle: have two category nodes in the Automatic meter reading system, one type is can be directly and the node of base sites point to-point communication, is called the G node; One type be receive channel status influence can not with the base station direct communication, but can be adjacent the node that node communicates, be called the B node.G, the B number of nodes changes with the channel state.
Shown in Figure 2 is the bus-type physical topology of Automatic meter reading system in certain unit building.Data acquisition broadcasting is initiated in the base station because broadcast singal decays with transmission range, have only the terminal node closer from the base station can with the direct reliable communication in base station, be the G node.Other nodes can not receive the broadcast message of base station, can not data be sent to the base station, but can point-to-point communication between the adjacent node, are the B node.
Among Fig. 2, all nodes in the subnet 1 all can with base station direct communication, direct point-to-point communication or communicate between the node through via node.Characteristics according to this, each node can equivalence be the logical topology of individual layer manual work spider web shown in Figure 3 at the MAC layer in the subnet 1.As shown in Figure 3, m terminal node constitutes the individual layer spider web on a m-1 limit, h
1Be any one in m the node, node h
1Can with all node direct communications in the subnet, can point-to-point communication between adjacent node, non-conterminous node is with Centroid h
1For relaying communicates.
Centroid h
1To all the other m-1 in the subnet terminal node assignment logic ID, till all nodes all obtain logic ID.
By node h
1Send broadcasting once more.Node h
1With respect to the base station, nearer with the physical distance of B node, receive node h
1The node number of broadcast message is that (k＞m) rejects m the node that has obtained logic ID to k, and node of selection is a Centroid in k-m node of remainder, and to this k-m-1 node assignment logic ID.
The Centroid of second sub-net sends broadcasting once more, and the B node is explored.As still have new node, and then repeating step 5, choose Centroid, and assignment logic ID is not till having new blind spot; If there is not new node, then the Centroid of an above sub-net is a relaying, sends the search ending message to the base station.The last networking result of MAC layer is as shown in Figure 4, and promptly searching all blind spots with 3 sub-net is example.
The ending message that the Centroid of " farthest " subnet returns is received in the base station, and search is accomplished.All nodes are relaying with the Centroid of its place subnet in the system, can carry out reliable communication with the base station, solve the problem that has blind spot.
The present invention utilizes this special networks structure of artificial spider web logical topology through the research to Automatic meter reading system physical layer and MAC layer, has solved the problem that has blind spot in the electric power Automatic meter reading system.
Claims (5)
1. the network-building method of low-voltage network power line carrier communication network MAC layer, it is characterized in that: it is realized by following steps:
Data broadcasting is initiated in base station in step 1, the low-voltage network power line carrier communication network; M G node in the MAC layer of low-voltage network power line carrier communication network receives the data broadcasting of base station; And form the n straton net of m-1 limit individual layer spider web logical topology structure at the MAC layer; M is the integer greater than 1, n=1;
Step 2, in the n straton net of the described m-1 of step 1 limit individual layer spider web logical topology structure, select a node h
nAs Centroid, all the other any nodes all can directly carry out data communication in the n straton net of said Centroid and individual layer spider web logical topology structure;
Step 3, Centroid h
nTo each the node assignment logic ID in the n straton net of m-1 limit individual layer spider web logical topology structure;
The Centroid h of step 4, n straton net
nInitiate data broadcasting once more;
K node receiving center node h in the MAC layer of step 5, low-voltage network power line carrier communication network
nThe data of broadcasting, all nodes that will obtain logic ID are then rejected, and k-m node of remainder formed n+1 straton net, and node of selection is as the Centroid h of this straton net in said n+1 straton net
N+1, said Centroid h
N+1All can directly carry out data communication, this Centroid h with all the other any nodes in the n+1 straton net
N+1To each the node assignment logic ID in the n+1 straton net; Make n=n+1, m=k-m returns execution in step four, and remaining B node is searched for, and all realizes direct communication or trunking traffic with the base station until all nodes, the foundation of communication network in the MAC layer of completion low-voltage network power line carrier communication network; K is the integer greater than m;
The G node for can be directly and the base station carry out the node of point-to-point communication;
The B node is that the influence that receives channel status can not directly communicate with the base station, but can be adjacent the node that node communicates.
2. the network-building method of low-voltage network power line carrier communication network MAC layer according to claim 1; It is characterized in that in the low-voltage network power line carrier communication network that the content of the packet that each node produces comprises: data source nodes ID, this node place subnet number of plies, destination address and data.
3. the network-building method of low-voltage network power line carrier communication network MAC layer according to claim 2; It is characterized in that in each straton net the packet that each node produces each node according to the ascending order of logic ID successively is sent to the Centroid of this layer.
4. the network-building method of low-voltage network power line carrier communication network MAC layer according to claim 3 is characterized in that in each straton net, and each node is identical to the time interval of the Centroid transmission packet of this layer.
5. the network-building method of low-voltage network power line carrier communication network MAC layer according to claim 3 is characterized in that the communication sequential of each straton net is consistent.
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| CN103441781A (en) * | 2013-08-28 | 2013-12-11 | 江苏麦希通讯技术有限公司 | Power line carrier ad hoc network method and system |
| CN105391474A (en) * | 2015-10-30 | 2016-03-09 | 厦门中天微电子科技有限公司 | Power line carrier centralized meter reading system node belonging automatic confirmation method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281105A (en) * | 2013-06-17 | 2013-09-04 | 北京科技大学 | Carrier table Ad-Hoc network method based on low voltage power line |
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| CN103441781A (en) * | 2013-08-28 | 2013-12-11 | 江苏麦希通讯技术有限公司 | Power line carrier ad hoc network method and system |
| CN103441781B (en) * | 2013-08-28 | 2015-07-29 | 江苏麦希通讯技术有限公司 | Power line carrier ad hoc network and system |
| CN105391474A (en) * | 2015-10-30 | 2016-03-09 | 厦门中天微电子科技有限公司 | Power line carrier centralized meter reading system node belonging automatic confirmation method |
| CN105391474B (en) * | 2015-10-30 | 2017-12-19 | 厦门中天微电子科技有限公司 | A kind of power line carrier centralized meter-reading system node-home automatically confirms that method |
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Application publication date: 20120118 |