WO2022222571A1 - Qualified sub-carrier determination and aggregation method and apparatus for nodes of field domain network - Google Patents
Qualified sub-carrier determination and aggregation method and apparatus for nodes of field domain network Download PDFInfo
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- WO2022222571A1 WO2022222571A1 PCT/CN2022/074889 CN2022074889W WO2022222571A1 WO 2022222571 A1 WO2022222571 A1 WO 2022222571A1 CN 2022074889 W CN2022074889 W CN 2022074889W WO 2022222571 A1 WO2022222571 A1 WO 2022222571A1
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- 230000004931 aggregating effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for determining and aggregating eligible subcarriers of a node of a field area network.
- Power equipment field area network is an emerging business application and belongs to a heterogeneous fusion network.
- the field area network is based on the intelligent terminal in the station area, and realizes a self-organized local communication network of backbone nodes such as power distribution equipment, switch cabinets, and branch boxes.
- the communication between the distribution network service endpoint and the main station often needs to be completed in multiple hops, which increases the degree of networking of the entire network and increases the diversity of routes connecting two points.
- the narrowband carrier channel is relatively narrow, it is a difficult problem to consider and improve the reliability of the carrier technology in the channel and communication, and to provide effective evaluation parameters and decision-making basis for the optimal route selection.
- the wide and narrow characteristics of the narrowband carrier communication will affect the communication rate and real-time performance of the power line communication network.
- the research on narrowband carrier and wireless communication reliability mainly focuses on physical layer enhancement and network routing.
- Carrier aggregation usually used in LTE and LTE-Advanced systems, refers to two or more carriers, and multiple discrete or continuous small frequency bands are expanded into wider frequency bands through aggregation to transmit data, Not only can it speed up the standardization process, but it can also maximize the use of existing LTE equipment and spectrum resources.
- the purpose of the embodiments of the present invention is to provide a method and apparatus for determining and aggregating qualified subcarriers of a node of a field area network, and the method and apparatus for determining and aggregating qualified subcarriers of a node of the field area network can determine qualified subcarriers,
- the bandwidth of the power line carrier communication is improved, and the reliability of the power line carrier communication is taken into account, and the complexity of the subcarrier aggregation is reduced.
- an embodiment of the present invention provides a method for determining a qualified subcarrier of a node of a field area network, the method comprising: according to the signal-to-noise ratio and the signal-to-noise ratio of each subcarrier between the first node and each neighbor node than the threshold, determine the availability of each subcarrier between the first node and each neighbor node; according to the availability of each subcarrier between the first node and each neighbor node and the each neighbor node sends The time of the period of the message, determine the reliability factor of each subcarrier; determine the set of reliability factors of the subcarrier between the first node and each neighbor node; for the first node and each neighbor node An intersection of sets of reliability factors of subcarriers between nodes is obtained to obtain qualified subcarriers of the first node.
- the availability of each subcarrier between the first node and each neighbor node is determined by the following formula: D is the signal-to-noise ratio threshold.
- An embodiment of the present invention further provides a subcarrier aggregation method for a field area network, the method comprising: the above-mentioned method for determining qualified subcarriers of nodes in a field area network; for each group of multiple nodes that are neighbor nodes to each other, The node with the largest number of qualified subcarriers is used as the cluster head node to complete the clustering; using the qualified subcarriers of the cluster head node, the cluster head node controls multiple nodes that are neighbor nodes to each other to perform carrier aggregation.
- the method further includes: the cluster head node performs carrier aggregation reconstruction on a plurality of nodes that are neighbor nodes with each other in a first preset period or when the communication success rate is detected to be lower than a threshold; or the central node uses In the second preset period or when it is detected that the communication success rate is lower than the threshold, the nodes of the field area network are reconstructed by clustering and carrier aggregation.
- An embodiment of the present invention further provides an apparatus for determining qualified subcarriers of a node of a field area network
- the apparatus includes: an availability determination unit, a reliability factor determination unit, a set determination unit, and an intersection determination unit, wherein the availability determination unit uses for determining the availability of each subcarrier between the first node and each neighbor node according to the signal-to-noise ratio of each subcarrier and the signal-to-noise ratio threshold between the first node and each neighbor node;
- the reliability The factor determination unit is configured to determine the reliability factor of each subcarrier according to the availability of each subcarrier between the first node and each neighbor node and the period of time in which each neighbor node sends a message;
- the set determination unit is used to determine the set of reliability factors of subcarriers between the first node and each neighbor node;
- the intersection determination unit is used to determine the reliability factor between the first node and each neighbor node.
- An intersection of sets of reliability factors of subcarriers is obtained to obtain qualified subcarriers of the first node.
- the availability of each subcarrier between the first node and each neighbor node is determined by the following formula: , SNR A ⁇ the signal-to-noise ratio of the k mth subcarrier between the first node and the B nth neighbor node, and D is the signal-to-noise ratio threshold.
- the reliability factor of each subcarrier is determined by the following formula: T is the period of the B n f neighbor node sending the message.
- An embodiment of the present invention further provides an apparatus for subcarrier aggregation in a field area network, characterized in that the apparatus includes: the above-mentioned apparatus for determining eligible subcarriers of a node of the field area network; a clustering unit, configured for each Group multiple nodes that are neighbor nodes to each other, and use the node with the largest number of qualified subcarriers as the cluster head node to complete the clustering; the carrier aggregation unit is used to use the qualified subcarriers of the cluster head node.
- the first node controls multiple nodes that are neighbor nodes to each other to perform carrier aggregation.
- the carrier aggregation unit is further configured to perform carrier aggregation reconstruction on a plurality of nodes that are neighbor nodes to each other by the cluster head node at a first preset period or when the communication success rate is detected to be lower than a threshold;
- the clustering unit is further configured to perform clustering on the nodes of the field area network by the central node of the concentrator at a second preset period or when the communication success rate is detected to be lower than a threshold; the carrier aggregation unit also uses When the central node of the concentrator detects that the communication success rate is lower than the threshold value at a second preset period, the nodes of the field area network are reconfigured for carrier aggregation.
- qualified sub-carriers can be determined to improve the bandwidth of power line carrier communication based on the carrier aggregation method of power line carrier and wireless integrated communication in the power equipment field area network, and take into account the reliability of power line carrier communication; based on the preferred sub-carriers
- the network node clustering method of and based on The sub-carrier aggregation within the cluster is performed by clustering the nodes, which reduces the complexity of the sub-carrier aggregation.
- FIG. 1 is a flowchart of a method for determining qualified subcarriers of a node of a field area network provided by an embodiment of the present invention
- FIG. 2 is a flowchart of a subcarrier aggregation method of a field area network provided by an embodiment of the present invention
- Fig. 3A-3B are schematic diagrams of a digital circuit for implementing carrier aggregation provided by an embodiment of the present invention
- Fig. 1 is a flowchart of a method for determining qualified subcarriers of a node of a field area network provided by an embodiment of the present invention
- FIG. 2 is a flowchart of a subcarrier aggregation method of a field area network provided by an embodiment of the present invention
- Fig. 3A-3B are schematic diagrams of a digital circuit for implementing carrier aggregation provided by an embodiment of the present invention
- FIG. 4 is a structural block diagram of a device for determining qualified subcarriers of a node of a field area network provided by an embodiment of the present invention
- Fig. 5 It is a structural block diagram of an apparatus for subcarrier aggregation in a field area network provided by an embodiment of the present invention. Description of reference numerals
- FIG. 1 is a flowchart of a method for determining qualified subcarriers of a node of a field area network according to an embodiment of the present invention. As shown in FIG.
- the method includes: Step S11, according to the signal-to-noise ratio of each sub-carrier and the signal-to-noise ratio threshold between the first node and each neighbor node, determine the relationship between the first node and each neighbor node Availability of each subcarrier in between; for example, a field area network contains multiple nodes, and the first node A is currently taken as an example.
- the first node A determines the connectivity with the neighbor node by receiving the HELLO message periodically sent by the neighbor node.
- the availability of each subcarrier between the first node and each neighbor node is determined by the following formula: , SNR ABnk ⁇ the signal-to-noise ratio of the k mth subcarrier between the first node and the B nth neighbor node, and D is the signal-to-noise ratio threshold.
- Step S12 according to the availability of each subcarrier between the first node and each neighbor node and the time of the period in which each neighbor node sends a message, determine the reliability factor of each subcarrier; for example, since The power load is time-varying and the channel quality is constantly changing, so each sub-carrier needs to be evaluated, and the reliability factor of each sub-carrier is calculated.
- the reliability factor of each subcarrier is determined by the following formula: T is the period of the B n f neighbor node sending the message.
- Step S13 determining the set of reliability factors of subcarriers between the first node and each neighbor node; for example, the set of reliability factors of subcarriers between the first node A and the 2nd neighbor node It can be expressed as: Wherein, MB is the set of reliability factors of subcarriers between the first node A and the :th neighbor node. A set of reliability factors s lmkAB , s tinkAB2 . . . of sub-carriers between the first node A and other neighbor nodes. It is not repeated here. Step S14, taking the intersection of the set of reliability factors of subcarriers between the first node and each neighbor node, to obtain the qualified subcarriers of the first node.
- FIG. 2 is a flowchart of a method for subcarrier aggregation in a field area network according to an embodiment of the present invention. As shown in FIG.
- the method includes: Step S21, executing the above-mentioned method for determining the qualified subcarriers of the nodes of the field area network; For example, the qualified subcarriers of each node can be obtained; in step S22, for each group of multiple nodes that are neighbor nodes to each other, the node with the largest number of qualified subcarriers is used as the cluster head node to complete the clustering; for example, the present invention adopts Without a base station, subcarriers in multiple power line channels are directly aggregated to realize direct communication between nodes. In the initialization phase of the PLC network, all neighboring nodes inform each other of their Vnode value (that is, the number of qualified subcarriers) through HELLO messages.
- Vnode value that is, the number of qualified subcarriers
- the node with the largest Vnode value is elected as the cluster head.
- the cluster head node controls the member nodes in the cluster to perform carrier aggregation.
- the cluster head node controls multiple nodes that are neighbor nodes to each other to perform carrier aggregation.
- the first node A is the cluster head node
- ⁇ M1, M2, , Mn ⁇ is the member node.
- the cluster head node A selects the qualified subcarrier set Scluster applicable to all nodes in the cluster using the method described above.
- 3A-3B are schematic diagrams of a digital circuit for implementing carrier aggregation provided by an embodiment of the present invention. As shown in FIG. 3A , it is a transmission circuit of carrier aggregation, and each processing branch corresponds to the generation of one component carrier. In order to combine multiple channels of data into one channel, the subcarrier components undergo digital-to-analog conversion after the baseband processing is completed, and finally generate a transmission signal through the sum channel, and send it out through the carrier front-end coupling circuit.
- the baseband processor part includes: Turbo convolution weaving, channel interleaving, modulation, IFFT, cyclic prefix and windowing. As shown in FIG. 3B , it is a receiving circuit of carrier aggregation. After receiving the signal, the receiving end realizes signal extraction through impulse noise cancellation, digital front end, baseband processor, and the like. In addition, due to the variability of the power line carrier channel quality, it is necessary to update the adopted set of qualified subcarriers in time to cope with changes in channel conditions.
- the present invention provides 4 kinds of power lines
- the system update method of carrier aggregation is as follows: the cluster head node performs carrier aggregation reconstruction on a plurality of nodes that are mutually neighbor nodes with a first preset period or when detecting that the communication success rate is lower than a threshold; or the central node Perform clustering and carrier aggregation reconstruction on the nodes of the field area network in a second preset period or when it is detected that the communication success rate is lower than the threshold.
- FIG. 4 is a structural block diagram of an apparatus for determining a qualified subcarrier of a node of a field area network according to an embodiment of the present invention. As shown in FIG.
- the apparatus includes: an availability determination unit 1, a reliability factor determination unit 2, a set determination unit 3, and an intersection determination unit 4, wherein the availability determination unit 1 is configured to determine according to the first node and each neighbor the signal-to-noise ratio of each sub-carrier between the nodes and the signal-to-noise ratio threshold, to determine the availability of each sub-carrier between the first node and each neighbor node; the reliability factor determination unit 2 is configured to The availability of each subcarrier between the first node and each neighbor node and the time of the period in which each neighbor node sends a message, determine the reliability factor of each subcarrier; the set determination unit 3 is used to determine A set of reliability factors of subcarriers between the first node and each neighbor node; the intersection determining unit 4 is used to determine the reliability factors of subcarriers between the first node and each neighbor node The intersection is obtained from the set of , and the qualified subcarriers of the first node are obtained.
- FIG. 5 is a structural block diagram of an apparatus for subcarrier aggregation in a field area network according to an embodiment of the present invention. As shown in FIG.
- the device includes: a device 5 for determining qualified subcarriers of nodes of the field area network; The node with the largest number of nodes is used as the cluster head node to complete the clustering; the carrier aggregation unit 7 is used for carrying the qualified subcarriers of the cluster head node, and the cluster head node controls the multiple nodes that are neighbor nodes to each other. polymerization.
- the carrier aggregation unit 7 is further configured to perform carrier aggregation reconstruction on a plurality of nodes that are neighbor nodes to each other by the cluster head node at a first preset period or when the communication success rate is detected to be lower than a threshold or the clustering unit 6 is further configured to cluster the nodes of the field area network by the concentrator central node at a second preset period or when the communication success rate is detected to be lower than a threshold; the carrier aggregation unit 7 is further configured to perform carrier aggregation reconstruction on the nodes of the field area network by the central node of the concentrator in a second preset period or when the communication success rate is detected to be lower than the threshold.
- the above-mentioned device for determining qualified subcarriers of a node of a field area network, a subcarrier aggregation device for a field area network, and the above-mentioned method for determining qualified subcarriers of a node of a field area network, and subcarrier aggregation of the field area network Embodiments of the method are similar, and are not repeated here. It should also be noted that the terms "comprising”, “comprising” or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes Other elements not expressly listed or otherwise inherent to such a process, method, commodity or apparatus.
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CN113258959A (en) | 2021-08-13 |
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