Low-power-consumption node based on dual-mode communication and equipment access method

Abstract

The invention relates to the technical field of dual-mode communication, and discloses a low-power-consumption node and equipment access method based on dual-mode communication, which comprises the following steps of: 1) initially establishing a power-consumption node cluster; 2) stable transmission of the low-power-consumption node cluster; and 3) maintaining the low-power-consumption node cluster. According to the low-power-consumption node based on dual-mode communication and the equipment access method, for a low-power-consumption sensor node, a one-way transmission mechanism is added in a dual-mode topology of two-way transmission; for a low-power-consumption sensor node, in order to reduce power consumption, a subsequent time slot is simulated according to a beacon frame time slot received by the sensor node in a bidirectional period; for low-power-consumption sensor nodes, a low-power-consumption node route maintenance mechanism is designed in order to balance route maintenance and node power consumption. On the premise of being compatible with HPLC + HRF normal working nodes, high-energy-efficiency data packet transmission of the sensor nodes is achieved, the survival time of the low-power-consumption sensor nodes is prolonged, end-to-end transmission delay is shortened, and energy efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-mode communication, and in particular to a low-power node and device access method based on dual-mode communication. Background Art

[0002] In the dual-mode HRF networking, CCO completes the entire networking process by sending central beacons, arranging discovery beacon sending, and sending proxy beacons on the HRF channel, triggering the network access request of STAs at each level. CCO needs to allocate TEI to the STA sites that have already joined the network. The TEI of CCO is fixed to 1. In the interoperability standard, the TEI range of CCO-allocated sites is 2 to 1016, and other addresses are reserved for subsequent expansion. According to the physical structure and business characteristics of low-voltage power lines, PLC networking selects a tree topology. CCO starts sending beacon frames (beacon frames) after power-on; STA listens to beacon frames after power-on, and selects a proxy to initiate association based on the beacon frames received from neighboring nodes.

[0003] The formation of the entire network is a process of gradual convergence from far to near. After a node enters the network, it will be arranged to send beacon frames to discover its child nodes to complete the formation of the entire network. Figure 1 As shown, dual-mode network topology.

[0004] like Figure 1 The networking mechanism shown is a planar networking method with a simple structure, equality of nodes, good network robustness and fault tolerance, but each node needs to be online in real time, the network maintenance overhead is large, the routing maintenance of the nodes requires a large amount of storage space and a large amount of maintenance information needs to be sent, and network congestion is prone to occur when the nodes are dense, resulting in data delays and loss, making it difficult to ensure the service quality of the network and the node power consumption is large, so the current dual-mode topology is not suitable for the access of low-power nodes.

[0005] The disadvantages of existing access methods are as follows:

[0006] (1) Routing maintenance is complex, especially when there are many network nodes and the network scale is large, the network construction and maintenance costs are high, the nodes need to be online all the time, and the power consumption is relatively high;

[0007] (2) The node routing maintenance requires a large amount of storage space and a large number of control messages to be sent, resulting in a relatively high node cost.

[0008] In order to solve the above problems, the present invention proposes a low-power node access method based on the network topology of the "Dual-Mode Communication Interoperability Technical Specification". Summary of the invention

[0009] 1. Technical issues to be solved

[0010] In view of the shortcomings of the prior art, the present invention provides a low-power node and device access method based on dual-mode communication. The method realizes high-energy-efficiency data packet transmission of sensor nodes under the premise of being compatible with HPLC+HRF normally working nodes, extends the survival time of low-power sensor nodes, shortens end-to-end transmission delay and improves energy efficiency.

[0011] (II) Technical solution

[0012] To achieve the above object, the present invention provides the following technical solution: a low-power node and device access method based on dual-mode communication, comprising the following steps:

[0013] 1) Initial establishment of power consumption node cluster;

[0014] 2) Stable transmission of low-power node clusters;

[0015] 3) Low power node cluster maintenance.

[0016] Furthermore, the initial establishment phase of the power consumption node cluster includes cluster head selection and cluster size.

[0017] Furthermore, the initial establishment phase of the power consumption node cluster specifically includes the following steps:

[0018] 1) A fuzzy logic-based method is adopted, with the distance from the node to the cluster head and the node residual energy as the input space, to formulate fuzzy projection rules, and the competitive cluster head capability as the only fuzzy output variable;

[0019] 2) Each node waits until time Ti according to its own calculated broadcast time, and the power node broadcasts the beacon message to participate in the cluster head election;

[0020] 3) The node selects a cluster head with better overall performance based on the signal strength and SNR of the received beacon frame.

[0021] Furthermore, the stable transmission phase of the low-power node cluster is executed after the cluster establishment phase, and the nodes send service messages or burst messages in the unidirectional transmission period according to the time slots derived from the beacon frame.

[0022] Furthermore, if the one-way period conflicts with the beacon period, back off for 2 seconds before sending again, and back off three times in sequence.

[0023] Furthermore, the low-power node cluster maintenance phase specifically includes the following steps:

[0024] 1) After the low-power node joins the network, the node periodically sends a wireless discovery list message in the two-way transmission period according to the time slot derived from the beacon frame. The discovery list carries information such as the node's network attributes, signal strength, and signal-to-noise ratio;

[0025] 2) Based on the routing cycle information in the beacon frame, the cluster head sends the active information of the low-power nodes in the locally maintained discovery list to the CCO through a periodic heartbeat detection message to maintain the network.

[0026] (III) Beneficial effects

[0027] Compared with the prior art, the present invention provides a low-power node and device access method based on dual-mode communication, which has the following beneficial effects:

[0028] This low-power node and device access method based on dual-mode communication adds a unidirectional transmission mechanism to the dual-mode topology of bidirectional transmission for low-power sensor nodes; for low-power sensor nodes, in order to reduce power consumption, the subsequent time slots are simulated according to the beacon frame time slots received by the sensor node in the bidirectional cycle; for low-power sensor nodes, in order to balance routing maintenance and node power consumption, a low-power node routing maintenance mechanism is designed. Under the premise of being compatible with HPLC+HRF normally working nodes, high-energy-efficiency data packet transmission of sensor nodes is achieved, the survival time of low-power sensor nodes is extended, the end-to-end transmission delay is shortened, and energy efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A network topology diagram for existing device access methods;

[0030] Figure 2 A time period and time delay diagram of a low-power node and device access method based on dual-mode communication proposed by the present invention;

[0031] Figure 3 A schematic diagram of dual-mode access steps of a low-power node and device access method based on dual-mode communication proposed by the present invention;

[0032] Figure 4 A schematic diagram of time slots and transmission cycles of a low-power node and device access method based on dual-mode communication proposed by the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 2-4In the dual-mode local communication for power consumption information collection, the main idea of ​​the low-power node access method provided by the present invention is to divide the time axis into one-way cycle units and two-way cycles on the basis of taking into account the stability of the business and the network. Figure 2 In the unidirectional period, the CSMA time slot unicasts the uplink service message, listens to the beacon frame in the bidirectional period, and postpones the subsequent time slot according to the received beacon frame. Figure 2 As shown, the route is maintained by sending discovery lists during the two-way period.

[0035] For details, please refer to Figure 3 , the low-power node accesses the dual-mode network including the following steps:

[0036] 1) Initial establishment of power consumption node cluster;

[0037] 2) Stable transmission of low-power node clusters;

[0038] 3) Low power node cluster maintenance.

[0039] The initial establishment phase of low-power node cluster mainly solves two key problems: one is cluster head selection; the other is cluster size, that is, the size of cluster radius. Cluster head selection is an uncertain problem. Therefore, a fuzzy logic-based method is adopted. The distance from the node to the cluster head and the residual energy of the node are used as the input space, and fuzzy projection rules are formulated. The ability to compete for cluster heads is used as the only fuzzy output variable. Each node broadcasts the beacon message according to its own calculation of the broadcast time. When waiting until time Ti, the power node broadcasts the beacon message and participates in the cluster head competition. The node with greater signal strength and better distance SNR has stronger cluster head competition ability, and its possibility of becoming a cluster head is greater. The node selects a cluster head with better comprehensive performance as the access target network of this site according to the signal strength and SNR of the received beacon frame. At the same time, the low-power node pushes the subsequent time slot according to the current beacon and does not forward the beacon message.

[0040] The stable transmission phase of the low-power node cluster is executed after the cluster establishment phase. The nodes send service messages or burst messages in the unidirectional transmission period according to the time slots derived from the beacon frame, such as Figure 4 As shown, if the one-way period conflicts with the beacon period, back off for 2 seconds before sending again, and back off three times in sequence.

[0041] After the low-power node joins the network, the node sends a wireless discovery list message regularly in the two-way transmission period according to the time slot derived from the beacon frame. The discovery list carries information such as the node's network attributes, signal strength, signal-to-noise ratio, etc. The cluster head sends the low-power node activity information in the locally maintained discovery list to the CCO through a periodic heartbeat detection message based on the routing cycle information in the beacon frame, so as to maintain the network.

[0042] The low-power access dual-mode method designed in the present invention realizes high-energy-efficiency data packet transmission of sensor nodes under the premise of being compatible with HPLC+HRF normally working nodes, prolongs the survival time of low-power sensor nodes, shortens end-to-end transmission delay and improves energy efficiency.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-power node and device access method based on dual-mode communication, characterized in that: The following steps are involved: 1) Initial establishment of power consumption node cluster; 2) Stable transmission of low-power node clusters; 3) Low-power node cluster maintenance.

2. A low-power node and device access method based on dual-mode communication according to claim 1, characterized in that: The initial establishment phase of the power consumption node cluster includes cluster head selection and cluster size.

3. A low-power node and device access method based on dual-mode communication according to claim 2, characterized in that: The initial establishment phase of the power consumption node cluster specifically includes the following steps: 1) A fuzzy logic-based method is adopted, with the distance from the node to the cluster head and the node residual energy as the input space, to formulate fuzzy projection rules, and the competitive cluster head capability as the only fuzzy output variable; 2) Each node waits until time Ti according to its own calculated broadcast time, and the power node broadcasts the beacon message to participate in the cluster head election; 3) The node selects a cluster head with better overall performance based on the signal strength and SNR of the received beacon frame.

4. A low-power node and device access method based on dual-mode communication according to claim 1, characterized in that: The stable transmission phase of the low-power node cluster is executed after the cluster establishment phase. The nodes send service messages or burst messages in the unidirectional transmission period according to the time slots derived from the beacon frame.

5. A low-power node and device access method based on dual-mode communication according to claim 4, characterized in that: If the one-way period conflicts with the beacon period, the signal will be sent again after a 2s backoff, and three backoffs will be performed in sequence.

6. A low-power node and device access method based on dual-mode communication according to claim 1, characterized in that: The low-power node cluster maintenance phase specifically includes the following steps: 1) After the low-power node joins the network, the node periodically sends a wireless discovery list message in the two-way transmission period according to the time slot derived from the beacon frame. The discovery list carries information such as the node's network attributes, signal strength, and signal-to-noise ratio; 2) Based on the routing cycle information in the beacon frame, the cluster head sends the active information of the low-power nodes in the locally maintained discovery list to the CCO through a periodic heartbeat detection message to maintain the network.

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