CN107911846B - Network selection method of micropower wireless network child node - Google Patents
Network selection method of micropower wireless network child node Download PDFInfo
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 10
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- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- 230000006855 networking Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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Abstract
A network selection method of a micropower wireless network child node relates to the field of power utilization information acquisition. A certain time is required from the time when the child node leaves the network to the time when the child node is successfully joined again, and the service data can be lost. The invention is as follows: the sub-nodes utilize the idle time in each time slot of the synchronous network, and enter the scanning of the peripheral network after the operation of the self-network is processed, wherein one is the normal frequency hopping frequency point of the self-network, and the other is the slow frequency hopping scanning frequency point where each channel resides; acquiring basically complete peripheral neighbor network information through long-time peripheral network scanning; and comprehensively comparing the network conditions with the advantages and disadvantages of the network conditions of the neighbor network according to the neighbor network information, and making a decision whether to switch to other networks. The sub-nodes of the technical scheme can scan the peripheral network under the normal communication state of the network, normal work is not affected, once the conditions of non-ideality of the network, network disconnection and the like occur, the network can be switched in time, and the condition of data loss is avoided.
Description
Technical Field
The invention relates to the field of power consumption information acquisition, in particular to a network selection method of a micropower wireless network sub-node.
Background
In the power utilization information collector system of the power company, the concentrator can establish communication with the electric energy meter or the collector in a micro-power wireless mode, so that the related data of the electric energy meter or the collector can be read remotely. An independent CAC module (Cellular Access Center) arranged on the concentrator is used as a micropower wireless central node, the electric energy meter or the collector is a sub-node, and the central node and the sub-node form a mesh network; at present, when the network where the child node itself is located is abnormal suddenly, the child node judges that the off-network state needs to meet one of the following three conditions:
the child node does not receive the host node roll call frame and does not receive the host node reply heartbeat confirmation frame within N (0< N <4) heartbeat cycles;
topology updating information is not received in a specified maximum topology version updating period;
and after receiving the MAC out-of-step notification, the node executes the off-network operation.
Therefore, a certain time is required from the time when the child node starts to judge the off-network state to the time when the child node is successfully added into a new network again, and communication interruption occurs in the time, so that service data is lost.
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 network selection method of a micropower wireless network sub-node so as to achieve the purpose of avoiding data loss caused by communication interruption. Therefore, the invention adopts the following technical scheme.
A network selection method of a micropower wireless network sub-node is characterized in that a concentrator in a power consumption information acquisition system establishes communication with an electric energy meter or an acquisition device in a micropower wireless mode, and related data of the electric energy meter or the acquisition device are read remotely; an independent CAC module arranged on the concentrator is used as a central node of the micro-power wireless network, the electric energy meter or the collector is a sub-node, and the central node and the sub-node form a mesh network; the method is characterized in that the network selection method comprises the following steps: the sub-nodes utilize the idle time in each time slot of the synchronous network, and enter the peripheral network scanning after the operation of the self-network is processed, namely the sub-nodes carry out double-frequency point scanning in each receiving time slot, wherein one is the normal frequency hopping frequency point of the self-network, and the other is the slow frequency hopping scanning frequency point where each channel resides; acquiring basically complete peripheral neighbor network information through long-time peripheral network scanning; and comprehensively comparing the network conditions with the advantages and disadvantages of the network conditions of the neighbor network according to the neighbor network information, and making a decision whether to switch to other networks. The sub-nodes can scan the peripheral network under the normal communication state of the network, 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.
As a further improvement and supplement to the above technical solutions, the present invention also includes the following additional technical features.
Further, the slow frequency hopping period detected by the neighbor network is set to 32 superframe time, and only valid beacon information is processed; in the maintenance time slot period, slow frequency hopping scanning is not carried out, namely neighbor network detection is not carried out; once the node starts the switch, the network access process is consistent with the normal network access process. The sub-nodes can scan the peripheral network under the normal communication state of the network, normal work is not influenced, once the network is disconnected, the network can be timely switched, and the condition of data loss is avoided.
Further, the network selection method 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 normal network access step includes: after the central node is powered on, channel scanning is firstly carried out, a channel list of normal frequency hopping is determined, and then a series of networking operations such as beacon frame sending, channel monitoring, network access application waiting of the sub-nodes and the like are carried out; and after the sub-nodes are powered on, the sub-nodes monitor the content of the channels through residence in all the channels, complete network synchronization after receiving the beacon frame, then execute network access operation after discovering the network, perform normal frequency hopping according to the periodically received content of the beacon frame after the network access, and maintain the related information of the network.
Has the advantages that: the sub-nodes can scan the peripheral network under the normal communication state of the network, 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.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a network access flow chart of the invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
The concentrator in the electricity consumption information acquisition system establishes communication with the electric energy meter or the acquisition device in a micro-power wireless mode and remotely reads related data of the electric energy meter or the acquisition device; the independent CAC module on the concentrator is used as a central node of the micro-power wireless network, the electric energy meter or the collector is a sub-node, and the central node and the sub-node form a mesh network.
As shown in fig. 1: the invention 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.
The sub-nodes utilize the idle time in each time slot of the synchronous network, and enter the peripheral network scanning after the operation of the self-network is processed, namely the sub-nodes carry out double-frequency point scanning in each receiving time slot, wherein one is the normal frequency hopping frequency point of the self-network, and the other is the slow frequency hopping scanning frequency point where each channel resides; acquiring basically complete peripheral neighbor network information through long-time peripheral network scanning; and comprehensively comparing the network conditions with the advantages and disadvantages of the network conditions of the neighbor network according to the neighbor network information, and making a decision whether to switch to other networks.
Further, the slow frequency hopping period detected by the neighbor network is set to 32 superframe time, and only valid beacon information is processed; in the maintenance time slot period, slow frequency hopping scanning is not carried out, namely neighbor network detection is not carried out; once the node starts the switch, the network access process is consistent with the normal network access process.
The flow chart of networking is shown in fig. 2, where a node a is a central node, B, C is a child node, where B is a direct access node, and C is a relay access through a node B. After the central node is powered on, channel scanning is firstly carried out, a channel list of normal frequency hopping is determined, and then a series of networking operations such as beacon frame sending, channel monitoring, network access application waiting of the sub-nodes and the like are carried out; and after the sub-nodes are powered on, the content on the channels is monitored through residence (slow frequency hopping) of all the channels, network synchronization is completed after the beacon frames are received, then a series of network access operations after the network is found are executed, normal frequency hopping is carried out according to the periodically received content of the beacon frames after the network is accessed, and the related information of the network is maintained.
The method for selecting a network of a sub-node in a micropower wireless network shown in fig. 1-2 is an embodiment of the present invention, and it is within the scope of the present invention to implement the substantial features and advantages of the present invention, and to make equivalent modifications thereof according to the practical needs.
Claims (3)
1. A network selection method of a micropower wireless network sub-node is characterized in that a concentrator in a power consumption information acquisition system establishes communication with an electric energy meter or an acquisition device in a micropower wireless mode, and related data of the electric energy meter or the acquisition device are read remotely; an independent CAC module arranged on the concentrator is used as a central node of the micro-power wireless network, the electric energy meter or the collector is a sub-node, and the central node and the sub-node form a mesh network; the method is characterized in that the network selection method comprises the following steps: the method comprises the following steps that a sub-node uses idle time in each time slot of a synchronous network, enters peripheral network scanning after processing the operation of the self-network, and performs double-frequency point scanning in each receiving time slot, wherein one is a normal frequency hopping frequency point of the self-network, and the other is a slow frequency hopping scanning frequency point where each channel resides; acquiring complete peripheral neighbor network information through long-time peripheral network scanning; comprehensively comparing the advantages and disadvantages of the neighbor network and the network condition of the neighbor network according to the neighbor network information, and making a decision whether to switch to other networks;
the network selection method 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 or when the network beacon preamble is not detected within 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. The method of claim 1, wherein the network selection method comprises: the slow frequency hopping period detected by the neighbor network is set to be 32 superframe time, and the sub-nodes only process effective beacon information; in the maintenance time slot period, slow frequency hopping scanning is not entered, and neighbor network detection is not carried out; once the node starts the switch, the network access process is consistent with the normal network access process.
3. The network selection method of a micropower wireless network sub-node of claim 2, wherein: the normal network access step comprises: after the central node is powered on, channel scanning is firstly carried out, a channel list of normal frequency hopping is determined, and then networking operation comprising beacon frame sending, channel monitoring and sub-node network access application waiting is carried out; and after the sub-nodes are powered on, the sub-nodes monitor the content of the channels through residence in all the channels, complete network synchronization after receiving the beacon frame, then execute network access operation after discovering the network, perform normal frequency hopping according to the periodically received content of the beacon frame after the network access, and maintain the related information of the network.
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| TWI726208B (en) * | 2018-04-27 | 2021-05-01 | 奇邑科技股份有限公司 | Method and system for communication with channel adjustment based on a signal scanning result |
| CN113098560B (en) * | 2020-03-30 | 2022-05-20 | 深圳友讯达科技股份有限公司 | Distributed frequency hopping network networking method for improving communication efficiency |
| CN114585032B (en) * | 2022-03-21 | 2023-12-12 | 沈阳中科奥维科技股份有限公司 | WIA-PA node network roaming method |
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