CN107509227B - Micropower wireless network communication method for electricity consumption information acquisition system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
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Abstract
A micropower wireless network communication method of a power utilization information acquisition system relates to the field of power utilization information acquisition. Because the field application environment is complex and changeable, the child nodes are allowed to switch back and forth in networks of different central nodes according to factors such as link quality, and the corresponding relation is also changed frequently. The invention comprises the following steps: selecting a sub-node optimal network; and a whole network sensing step: the method comprises the steps that a child node monitors a beacon frame sent by a neighbor child node of the child node; a batch change step; 4) and actively and synchronously reporting. The sub-nodes can scan the peripheral network under the normal communication state of the network, the normal work is not influenced, once the conditions of non-ideal network, network disconnection and the like occur, the network can be switched in time, and the condition of data loss is avoided; the child node can be found out in time when being off-network, the corresponding relation between the central node and the child node can be modified in time, and the data loss situation and the like can be avoided.
Description
Technical Field
The invention relates to the field of power consumption information acquisition, in particular to a micropower wireless network communication method of a power consumption information acquisition system.
Background
The power utilization information acquisition system of the power company generally adopts two-stage network communication, three communication nodes are an acquisition system master station, a concentrator, an acquisition device or an electric energy meter from top to bottom in sequence, the concentrator can communicate with the acquisition device or the electric energy meter in a micro-power wireless mode to remotely read data of the acquisition device or the electric energy meter, a communication unit CAC (cellular access center) of the concentrator is a central node of a micro-power wireless network, and a communication unit where the acquisition device or the electric energy meter is located is a sub-node. The first-stage network of the two-stage network communication is a remote communication mode such as GPRS, 3G/4G, optical fiber and the like adopted between the acquisition system main station and the concentrator; the second level is a micropower wireless communication mode between the central node and the child nodes, the central node is responsible for establishing a network, the child nodes execute network access application and other operations, and in the established network, the central node needs to manage routing tables from the central node to all the child nodes. Therefore, the collection system master station must manage the file correspondence between the child nodes and the corresponding central nodes to accurately and timely communicate with the child nodes.
Because the field application environment is complex and changeable, the corresponding relation is often changed due to the fact that the child nodes are allowed to switch back and forth in networks of different central nodes according to factors such as link quality, the collection system main station needs to obtain the change of the corresponding relation of the archives in time, and the method comprises two links: the first is that the central node should timely judge that the corresponding relationship with the child nodes changes; secondly, the central node synchronizes the change information to the concentrator in time, and the concentrator synchronizes to the acquisition system master station.
Disclosure of Invention
The technical problem to be solved and the technical task to be solved by the invention are to perfect and improve the prior technical scheme and provide a micropower wireless network communication method of the electricity consumption information acquisition system, so as to achieve the aim. Therefore, the invention adopts the following technical scheme.
A micropower wireless network communication method of an electricity consumption information acquisition system, the electricity consumption information acquisition system adopts two-stage network communication, three communication nodes are an acquisition system master station, a concentrator, an acquisition device or an electric energy meter from top to bottom in sequence, the concentrator adopts a micropower wireless mode to communicate with the acquisition device or the electric energy meter so as to remotely read data of the acquisition device or the electric energy meter, the concentrator is provided with a communication unit CAC which is a central node of the micropower wireless network, and a communication unit where the acquisition device or the electric energy meter is located is a sub-node; the first-stage network of the two-stage network communication is a remote communication mode between the acquisition system master station and the concentrator; the second level is a micro-power wireless communication mode between the central node and the child nodes, the central node is responsible for building a network, the child nodes execute network access application operation, and in the built network, the central node manages routing tables from the central node to all the child nodes; the method is characterized in that: the micropower wireless network communication method comprises the following steps:
1) selecting a child node optimal network:
when the subnode performs normal frequency hopping communication in the network of the central node, the subnode enters peripheral network scanning by using the idle time in each time slot of the synchronous network, namely the subnode performs double-frequency point scanning in each receiving time slot, and obtains basically complete peripheral neighbor network information through long-time peripheral network scanning, and the subnode comprehensively compares the information with the network condition of the subnode to determine whether to switch to other networks; if the neighbor network is superior to the network, executing gateway related operation;
2) and a whole network sensing step:
the method comprises the steps that a subnode monitors beacon frames sent by own neighbor subnodes, if a certain neighbor subnode is found to be more than 1 superframe without sending beacons, information is sent to a central node to report that the superframe of the subnode does not send beacons, the central node can send roll call frames to confirm whether the neighbor subnode is in a network or not after receiving the information, if the roll call confirmation frames are not received, the off-network condition is synchronized to a concentrator in real time, and the concentrator reports the off-network condition to an acquisition system master station in real time;
3) a batch changing step:
the central node periodically executes child node searching operation at the time t1 every day, and then synchronizes the affiliation with the concentrator at the time t2 every day so as to synchronize to the acquisition system master station;
4) active synchronous reporting:
when a central node discovers a new sub-node, the operation of searching the sub-node is carried out in real time, only the affiliation relationship of the sub-node is synchronized to a concentrator in real time, the concentrator is synchronized to an acquisition system master station upwards, and the acquisition system master station determines the new affiliation relationship of the sub-node according to the sequence of synchronous reporting time; and the concentrator reports the synchronous attribution relationship to the acquisition system master station within m minutes after each time, the synchronous attribution relationship is not reported again no matter whether the attribution relationship is changed, and if the attribution relationship is changed after m minutes, the synchronous attribution relationship is continuously reported.
As a further improvement and supplement to the above technical solutions, the present invention also includes the following additional technical features.
Further, in the step 4), the synchronous reporting process includes synchronization between the central node CAC and the concentrator and synchronization between the concentrator and the acquisition system master station;
401) synchronization between the central node CAC and the concentrator: when a new node joins the network, judging whether the table needs to be searched, if so, starting the single-point table search, if not, directly reporting to the concentrator, and after receiving a confirmation response, finishing the synchronization process between the central node CAC and the concentrator;
402) synchronization between concentrator and acquisition system master station: the concentrator updates the file synchronously after acquiring the information of the new added child nodes reported by the CAC, reports a parameter change recording event ERC3, the changed parameter data unit in the data content is marked as a measurement point state parameter F150, and reports the file parameter change mark in the concentrator to the acquisition system master station.
Further, the sub-node optimal network selection step comprises the following steps:
11) starting the optimal network selection work when receiving the time slot;
12) judging whether the network beacon preamble is detected within the overtime time or not, if the network beacon preamble is detected within the overtime time, waiting for the network message, if the network message is detected within the overtime time, receiving the network message, and if the network message is not detected within the overtime time, switching to a target scanning frequency point and starting slow frequency hopping scanning; after receiving the network message and when the network beacon preamble is not detected within the overtime, switching to a target scanning frequency point, and starting slow frequency hopping scanning;
13) continuously receiving the message, and recording neighbor network information if the message is an effective beacon;
14) judging whether the time slot is finished or not, if not, continuing to step 13); if the time slot is finished, comparing the link quality information of the neighbor network and the network;
15) judging whether the neighbor network is superior to the network, wherein the neighbor network comprises network level, link quality and network scale factors;
16) if the neighbor network is superior to the network, the network access related operation is executed, otherwise, the operation is finished, and the next receiving time slot is waited to start.
Further, the whole network sensing step comprises:
21) the child node monitors neighbor beacon information;
22) judging whether the neighbor information is received or not, if not, continuing to execute the step 21) to monitor the neighbor beacon information; if the neighbor information is received, entering the next step 23);
23) calculating the time interval of receiving the neighbor node;
24) judging whether the time interval exceeds a limit value; if the time interval exceeds the limit value, reporting to the central node, and the neighbor is possible to be offline, and if the time interval does not exceed the limit value, continuing to execute the step 21) to listen to the neighbor beacon information.
25) The central node monitors the reported information of the child nodes, and if receiving the reported neighbor offline information of the child nodes, roll names of the reported child nodes;
26) and judging whether the child node responds, if not, reporting the offline of the child node of the concentrator, and if so, continuing to execute the step 25) to monitor the reported information of the child node.
Has the advantages that:
1. through the sub-node optimal network selection step, the sub-node can scan the peripheral network under the normal communication state of the network, the normal work is not influenced, once the conditions of non-ideal network, network disconnection and the like occur, the network can be switched in time, and the condition of data loss is avoided.
2. Through the whole network sensing step, the off-network of the child node can be found in time, the corresponding relation between the central node and the child node is modified in time, and the data loss situation and the like are avoided;
3. the batch change step and the active synchronous reporting step ensure that the corresponding relation of the files between the central node and the child nodes is accurate, so that the central node can communicate with the child nodes in time.
Drawings
Fig. 1 is a flow chart of the selection of a child node optimal network of the present invention.
FIG. 2 is a sub-node processing flow diagram of the full network aware step of the present invention.
FIG. 3 is a flow chart of the central node processing of the full network aware step of the present invention.
Fig. 4 is a flow chart of the synchronization between the central node CAC and the concentrator of the invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
The electricity consumption information acquisition system adopts two-stage network communication, three communication nodes are an acquisition system master station, a concentrator and an acquisition device or an electric energy meter from top to bottom in sequence, the concentrator adopts a micro-power wireless mode to communicate with the acquisition device or the electric energy meter so as to remotely read data of the acquisition device or the electric energy meter, the concentrator is provided with a communication unit CAC which is a central node of a micro-power wireless network, and a communication unit where the acquisition device or the electric energy meter is located is a sub-node; the first-stage network of the two-stage network communication is a remote communication mode between the acquisition system master station and the concentrator; the second level is a micro-power wireless communication mode between the central node and the child nodes, the central node is responsible for building a network, the child nodes execute network access application operation, and in the built network, the central node manages routing tables from the central node to all the child nodes;
the micropower wireless network communication method comprises the following steps:
1) selecting a child node optimal network:
when the subnode performs normal frequency hopping communication in the network of the central node, the subnode enters peripheral network scanning by using the idle time in each time slot of the synchronous network, namely the subnode performs double-frequency point scanning in each receiving time slot, and obtains basically complete peripheral neighbor network information through long-time peripheral network scanning, and the subnode comprehensively compares the information with the network condition of the subnode to determine whether to switch to other networks; and if the neighbor network is better than the network, executing gateway related operation.
The specific steps are shown in fig. 1, and comprise:
11) starting the optimal network selection work when receiving the time slot;
12) judging whether the network beacon preamble is detected within the overtime time or not, if the network beacon preamble is detected within the overtime time, waiting for the network message, if the network message is detected within the overtime time, receiving the network message, and if the network message is not detected within the overtime time, switching to a target scanning frequency point and starting slow frequency hopping scanning; after receiving the network message and when the network beacon preamble is not detected within the overtime, switching to a target scanning frequency point, and starting slow frequency hopping scanning;
13) continuously receiving the message, and recording neighbor network information if the message is an effective beacon;
14) judging whether the time slot is finished or not, if not, continuing to step 13); if the time slot is finished, comparing the link quality information of the neighbor network and the network;
15) judging whether the neighbor network is superior to the network, wherein the neighbor network comprises network level, link quality and network scale factors;
16) if the neighbor network is superior to the network, the network access related operation is executed, otherwise, the operation is finished, and the next receiving time slot is waited to start.
2) And a whole network sensing step:
the method comprises the steps that a child node monitors beacon frames sent by own neighbor child nodes, if a certain neighbor child node is found to be more than 1 superframe without sending beacons, information is sent to a central node to report that the superframe of the child node does not send beacons, the central node can send roll call frames to confirm whether the neighbor child node is on the network or not after receiving the information, if the roll call confirmation frames are not received, the off-network condition is synchronized to a concentrator in real time, and the concentrator reports the off-network condition to an acquisition system master station in real time.
The specific steps are shown in fig. 2 and fig. 3, and include:
21) the child node monitors neighbor beacon information;
22) judging whether the neighbor information is received or not, if not, continuing to execute the step 21) to monitor the neighbor beacon information; if the neighbor information is received, entering the next step 23);
23) calculating the time interval of receiving the neighbor node;
24) judging whether the time interval exceeds a limit value; if the time interval exceeds the limit value, reporting to the central node, and the neighbor is possible to be offline, and if the time interval does not exceed the limit value, continuing to execute the step 21) to listen to the neighbor beacon information.
25) The central node monitors the reported information of the child nodes, and if receiving the reported neighbor offline information of the child nodes, roll names of the reported child nodes;
26) and judging whether the child node responds, if not, reporting the offline of the child node of the concentrator, and if so, continuing to execute the step 25) to monitor the reported information of the child node.
3) A batch changing step:
the central node periodically executes child node searching operation at the time t1 every day, and then synchronizes the affiliation with the concentrator at the time t2 every day so as to synchronize to the acquisition system master station;
4) active synchronous reporting:
when a central node discovers a new sub-node, the operation of searching the sub-node is carried out in real time, only the affiliation relationship of the sub-node is synchronized to a concentrator in real time, the concentrator is synchronized to an acquisition system master station upwards, and the acquisition system master station determines the new affiliation relationship of the sub-node according to the sequence of synchronous reporting time; and the concentrator reports the synchronous attribution relationship to the acquisition system master station within m minutes after each time, the synchronous attribution relationship is not reported again no matter whether the attribution relationship is changed, and if the attribution relationship is changed after m minutes, the synchronous attribution relationship is continuously reported.
The synchronous reporting process comprises the synchronization between the central node CAC and the concentrator and the synchronization between the concentrator and the acquisition system master station;
401) synchronization between the central node CAC and the concentrator: as shown in fig. 4, when a new node joins the network, it is determined whether table search is needed, if so, a single-point table search is started, if not, the single-point table search is directly reported to the concentrator, and after receiving the acknowledgement, the synchronization process between the central node CAC and the concentrator is completed; the synchronous message actively reported by the CAC needs to extend the message in the local communication module interface protocol of the 2 nd part concentrator of the communication protocol of the Q GDW1376.2-2013 power consumer electricity consumption information acquisition system, namely 'AFN =06, FN = 4'; the specific message data format is shown in table 1;
table 1 extended packet data format
| Data content | Data format | Number of bytes |
| Reporting the number n of slave nodes | BIN | 1 |
| Slave node 1 communication address | BCD | 6 |
| Slave node 1 communication protocol type | BIN | 1 |
| Slave node 1 sequence number | BIN | 2 |
| Slave node 1 device type | BIN | 1 |
| The slave node 1 is connected with the total number M of slave nodes | BIN | 1 |
| The number m of slave nodes connected with the message transmission | BIN | 1 |
| Drop slave node 1 communication address | BCD | 6 |
| Down slave node 1 communication protocol type | BIN | 1 |
| …… | …… | …… |
| Connecting slave node m communication address | BCD | 6 |
| Lower slave node m communication protocol type | BIN | 1 |
a) Communication protocol type: 00H is transparent transmission; 01H is DL/T645-1997; 02H is DL/T645-2007, 03H-FFH reservation.
b) Slave node sequence number: refers to the serial number of the slave node in the routing table.
c) The device type: 00H is a collector, 01H is an electric energy meter, and 02H-FFH is reserved.
d) The total number of slave nodes M: when the equipment type is 01H or 00H, M is more than or equal to 0 and less than or equal to 32. M =0 indicates that there is no 485 tables under the collector; m >0, representing the total number of 485 tables connected below the collector. When the device type is 02H, M = 0.
e) The number m of the subordinate nodes reported this time is as follows: when the equipment type is 01H or 00H, m is more than or equal to 0 and less than or equal to 8. M =0, M = 0; m is greater than 0, M is greater than or equal to M, and M represents the number of 485 tables connected under the collector reported this time. When the device type is 02H, M = 0.
f) Connecting the communication address of the slave node: when the device type is 01H or 00H, and M >0, the communication address of the 485 electric meter under the collector is represented.
402) Synchronization between concentrator and acquisition system master station: the concentrator updates the file synchronously after acquiring the information of the new added child nodes reported by the CAC, reports a parameter change recording event ERC3, the changed parameter data unit in the data content is marked as a measurement point state parameter F150, and reports the file parameter change mark in the concentrator to the acquisition system master station.
The micro-power wireless network communication method of the electricity consumption information acquisition system shown in fig. 1-4 is a specific embodiment of the present invention, which already embodies the substantial features and the improvements of the present invention, and can be modified equivalently according to the practical use requirements and under the teaching of the present invention, and the method is within the scope of protection of the present invention.
Claims (4)
1. A micropower wireless network communication method of an electricity consumption information acquisition system, the electricity consumption information acquisition system adopts two-stage network communication, three communication nodes are an acquisition system master station, a concentrator, an acquisition device or an electric energy meter from top to bottom in sequence, the concentrator adopts a micropower wireless mode to communicate with the acquisition device or the electric energy meter so as to remotely read data of the acquisition device or the electric energy meter, the concentrator is provided with a communication unit CAC which is a central node of the micropower wireless network, and a communication unit where the acquisition device or the electric energy meter is located is a sub-node; the first-stage network of the two-stage network communication is a remote communication mode between the acquisition system master station and the concentrator; the second level is a micro-power wireless communication mode between the central node and the child nodes, the central node is responsible for building a network, the child nodes execute network access application operation, and in the built network, the central node manages routing tables from the central node to all the child nodes; the method is characterized in that: the micropower wireless network communication method comprises the following steps:
1) selecting a child node optimal network:
when the sub-node performs normal frequency hopping communication in the network of the central node, the idle time in each time slot of the synchronous network is utilized to enter peripheral network scanning, the sub-node performs double-frequency point scanning in each receiving time slot, complete peripheral neighbor network information is acquired through long-time peripheral network scanning, the advantages and disadvantages of neighbor networks and self network conditions are comprehensively compared, and the decision of whether to switch to other networks is made; if the neighbor network is superior to the network, executing gateway related operation;
2) and a whole network sensing step:
the method comprises the steps that a subnode monitors beacon frames sent by own neighbor subnodes, if a certain neighbor subnode is found to be more than 1 superframe without sending beacons, information is sent to a central node to report that the superframe of the subnode does not send beacons, the central node can send roll call frames to confirm whether the neighbor subnode is in a network or not after receiving the information, if the roll call confirmation frames are not received, the off-network condition is synchronized to a concentrator in real time, and the concentrator reports the off-network condition to an acquisition system master station in real time;
3) a batch changing step:
the central node periodically executes child node searching operation at the time t1 every day, and then synchronizes the affiliation with the concentrator at the time t2 every day so as to synchronize to the acquisition system master station;
4) active synchronous reporting:
when a central node discovers a new sub-node, the operation of searching the sub-node is carried out in real time, only the affiliation relationship of the sub-node is synchronized to a concentrator in real time, the concentrator is synchronized to an acquisition system master station upwards, and the acquisition system master station determines the new affiliation relationship of the sub-node according to the sequence of synchronous reporting time; and the concentrator reports the synchronous attribution relationship to the acquisition system master station within m minutes after each time, the synchronous attribution relationship is not reported again no matter whether the attribution relationship is changed, and if the attribution relationship is changed after m minutes, the synchronous attribution relationship is continuously reported.
2. The micropower wireless network communication method of the electricity information acquisition system according to claim 1, wherein: in step 4), the synchronous reporting process comprises the synchronization between the central node CAC and the concentrator and the synchronization between the concentrator and the acquisition system master station;
401) synchronization between the central node CAC and the concentrator: when a new node joins the network, judging whether the table needs to be searched, if so, starting the single-point table search, if not, directly reporting to the concentrator, and after receiving a confirmation response, finishing the synchronization process between the central node CAC and the concentrator;
402) synchronization between concentrator and acquisition system master station: the concentrator updates the file synchronously after acquiring the information of the new added child nodes reported by the CAC, reports a parameter change recording event ERC3, the changed parameter data unit in the data content is marked as a measurement point state parameter F150, and reports the file parameter change mark in the concentrator to the acquisition system master station.
3. The micropower wireless network communication method of the electricity information acquisition system according to claim 1, wherein: the sub-node optimal network selection step comprises the following steps:
11) starting the optimal network selection work when receiving the time slot;
12) judging whether the network beacon preamble is detected within the overtime time or not, if the network beacon preamble is detected within the overtime time, waiting for the network message, if the network message is detected within the overtime time, receiving the network message, and if the network message is not detected within the overtime time, switching to a target scanning frequency point and starting slow frequency hopping scanning; if the network beacon preamble is not detected within the overtime time or the network message is received, switching to a target scanning frequency point, and starting slow frequency hopping scanning;
13) continuously receiving the message, and recording neighbor network information if the message is an effective beacon;
14) judging whether the time slot is finished or not, if not, continuing to step 13); if the time slot is finished, comparing the link quality information of the neighbor network and the network;
15) judging whether the neighbor network is superior to the network, wherein the neighbor network comprises network level, link quality and network scale factors;
16) if the neighbor network is superior to the network, the network access related operation is executed, otherwise, the operation is finished, and the next receiving time slot is waited to start.
4. The micropower wireless network communication method of the electricity information acquisition system according to claim 1, wherein: the whole network sensing step comprises:
21) the child node monitors neighbor beacon information;
22) judging whether the neighbor information is received or not, if not, continuing to execute the step 21) to monitor the neighbor beacon information; if the neighbor information is received, entering the next step 23);
23) calculating the time interval of receiving the neighbor node;
24) judging whether the time interval exceeds a limit value; if the time interval exceeds the limit value, reporting to the central node, and the neighbor is off line, and if the time interval does not exceed the limit value, continuing to execute the step 21) to monitor the neighbor beacon information;
25) the central node monitors the reported information of the child nodes, and if receiving the reported neighbor offline information of the child nodes, roll names of the reported child nodes;
26) and judging whether the child node responds, if not, reporting the offline of the child node of the concentrator, and if so, continuing to execute the step 25) to monitor the reported information of the child node.
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