CN109152099A - Rail traffic vehicles passive wireless sensor network node network-building method and device - Google Patents
Rail traffic vehicles passive wireless sensor network node network-building method and device Download PDFInfo
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- CN109152099A CN109152099A CN201811178000.5A CN201811178000A CN109152099A CN 109152099 A CN109152099 A CN 109152099A CN 201811178000 A CN201811178000 A CN 201811178000A CN 109152099 A CN109152099 A CN 109152099A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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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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- 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
- H04W40/10—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources based on available power or energy
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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
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of rail traffic vehicles passive wireless sensor network node network-building method and devices, wherein, method is the following steps are included: be grouped passive sensor node according to quantity, communication distance factor, every group node includes a central node and multiple child nodes, it is mutually indepedent by different network numbers and communications band, establish distributed passive wireless sensor network；Timeslot scheduling is carried out to distributed passive wireless sensor network by superframe design, executes preset task；According to the size choice of dynamical central node of distributed passive wireless sensor nodes energy, to carry out networking and the balancing energy of distributed passive wireless sensor network；And distributed passive wireless sensor network child nodes data collected are summarized by central node, and be transmitted to server.This method effectively solves the problems, such as that Node distribution is extensive, networking is difficult, has the advantages that algorithm is simply easily realized, node power consumption is low, network performance is good.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of rail traffic vehicles passive wireless sensor network node
Network-building method and device.
Background technique
In a suitable case, railway freight is more at low cost than road freight, also more saves the energy.To rail traffic vehicles core
It is to guarantee the important measures of train operating safety that center portion part, which carries out maintenance,.Wireless sensor network is low in energy consumption, high reliablity, flexibly
Property strong feature so that it is had a wide range of applications in vehicle health monitoring field.
However, in the prior art, most wireless sensor network nodes are completely dependent on external cell power supply, and there are battery storages
Can be limited, replace the problems such as battery is at high cost, and old and useless battery pollutes environment.Passive wireless sensor is designed using energy collection technology
Device node is a kind of effective solution scheme.
In addition, power supply facilities is less in carriage of freight train, remote passive wireless sensor node passes through multi-hop
Mode will greatly increase the consumption of energy with the communication for being located at train head and the tail gateway, and it is uneven to aggravate energy distribution, leads to portion
Divide passive bus overload, causes network paralysis, seriously affect the efficiency of transmission and stability of network.Group is realized by multi-hop
The mode of net transmission is no longer desirable for the longer goods train of vehicle.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of rail traffic vehicles passive wireless sensor network node groups
Network method has the advantages that algorithm is simply easily realized, node power consumption is low, network performance is good.
It is another object of the present invention to propose a kind of rail traffic vehicles passive wireless sensor network node networking
Device.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of rail traffic vehicles passive wireless sensor
Network node network-building method, comprising the following steps: passive sensor node is grouped according to quantity, communication distance factor,
Every group node includes a central node and multiple child nodes, and mutually indepedent by different network numbers and communications band, with
Establish distributed passive wireless sensor network；When being carried out by superframe design to the distributed passive wireless sensor network
Gap scheduling, to execute preset task；It is selected according to the size dynamic of the distributed passive wireless sensor nodes energy
The central node is taken, to carry out networking and the balancing energy of the distributed passive wireless sensor network；And it will be described
Child node data collected described in distributed passive wireless sensor network are summarized by the central node, and to
The data are transmitted to server by the transmission of ground fixed base stations equipment.
The rail traffic vehicles passive wireless sensor network node network-building method of the embodiment of the present invention, by passive biography
Sensor node is grouped the distributed passive wireless sensor network of foundation, and carries out network superframe design to it, with center
Node choice of dynamical algorithm realizes that node is synchronous and Networking Design, to complete the transmission of data, effectively solve Node distribution extensively,
The problem of networking difficulty has the advantages that algorithm is simply easily realized, node power consumption is low, network performance is good.
In addition, rail traffic vehicles passive wireless sensor network node network-building method according to the above embodiment of the present invention
There can also be following additional technical characteristic:
Further, in one embodiment of the invention, described that the distributed network is carried out by superframe design
Timeslot scheduling further comprises: by being time-multiplexed the distributed passive wireless sensor network access protocol, wherein
The period of superframe a length of 10s, and be equally divided into 1000 time slots, the when a length of 10ms of each time slot.
Further, in one embodiment of the invention, the time slot be divided by function for base station signal monitoring when
Gap, central node time slot, central node change time slot, node data acquire time slot, child node ascending time slot, central node
Ascending time slot, balancing energy time slot and suspend mode time slot.
Further, in one embodiment of the invention, described group of network process further comprises: synchronous in the node
Afterwards, the timer of giving out a contract for a project for setting up a preset length at random, at the end of timer timing, node will send the networking of the node
Broadcast packet；It is described give out a contract for a project timer selection after the completion of, the node is opened and is monitored inside subnet, when concurrently setting default monitor
Between；Timing is completed in the timer of giving out a contract for a project, triggering node is sent into networking broadcast packet, is sent to networking broadcast packet, institute
It states node and comes back to listening mode, continued to execute according to process；If above-mentioned node receives network center's section in snoop procedure
The broadcast packet of point, the node will execute networking process according to the information of above-mentioned broadcast packet；If the node receives other sub- sections
Point rather than the networking broadcast packet of central node, then above-mentioned node will according to the central node Algorithms of Selecting calculate centromere
Point；If the node does not receive the networking broadcast packet of preset quantity, the address information and electricity in the networking broadcast packet are recorded
Information is measured, and comes back to listening state；If the node receives the networking broadcast packet of preset quantity to obtain central node,
The node will send broadcast packet immediately, and by all nodes in the information informing network of the central node；When the prison
Timer expiry is listened, then the node does not receive the broadcast packet of the central node in entire networking process；If the section
Quantity needed for the quantity of networking broadcast packet that point receives is not up to central node Algorithms of Selecting, then most nodes are not in network
It opens, is currently not suitable for building network, so execution is kept out of the way suspend mode algorithm by node；To the end of sleep procedure, reopen into
Net process.
Further, in one embodiment of the invention, it is saved according in the distributed passive wireless sensor network
The size of point energy carries out the choice of dynamical of the central node, to state distributed passive wireless sensor network described in progress
Networking and balancing energy further comprise: the number that the passive wireless sensor node of the subnet is arranged is N, and critical point is
K, and k=log2 N, the quantity for receiving networking broadcast packet is m；After the child node receives networking broadcast packet, parsing networking broadcast
Packet, by k=log2 N, k value is calculated, N is interstitial content；If k is less than or equal to 1, the higher child node conduct of energy is chosen
The central node；If the quantity m for the networking broadcast packet that k value is greater than 1 and receives is less than k, currently unsuitable building network, on
Central node is stated not change；If the quantity m for the networking broadcast packet that k value is greater than 1 and receives is greater than or equal to k, node updates are worked as
The child node of preceding ceiling capacity using the child node of current ceiling capacity as the central node, and returns to the center newly chosen
The identity information of node.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of rail traffic vehicles passive wireless sensor
Device network node network device, comprising: establish module, for according to quantity, communication distance factor to passive sensor node into
Row grouping, every group node include a central node and multiple child nodes, and mutual by different network numbers and communications band
It is independent, to establish distributed passive wireless sensor network；Network superframe designs module, for being designed by network superframe to institute
It states distributed passive wireless sensor network and carries out timeslot scheduling, to execute preset task；Networking and central node choice of dynamical
Module, for the central node according to the size choice of dynamical of the distributed passive wireless sensor nodes energy
Choice of dynamical, to carry out networking and the balancing energy of the distributed passive wireless sensor network；And summarize transmission mould
Block, for child node data collected described in the distributed passive wireless sensor network to be passed through the central node
Summarized, and fixed base stations equipment is transmitted to the ground, and the data are transmitted to server.
The rail traffic vehicles passive wireless sensor network node network device of the embodiment of the present invention, by passive biography
Sensor node is grouped the distributed passive wireless sensor network of foundation, and carries out network superframe design to it, with center
Node choice of dynamical algorithm realizes that node is synchronous and Networking Design, to complete the transmission of data, effectively solve Node distribution extensively,
The problem of networking difficulty has the advantages that algorithm is simply easily realized, node power consumption is low, network performance is good.
In addition, rail traffic vehicles passive wireless sensor network node network device according to the above embodiment of the present invention
There can also be following additional technical characteristic:
Further seemingly, in one embodiment of the invention, the network superframe module will be described point by time division multiplexing
Cloth passive wireless sensor network access protocol, wherein the period of superframe a length of 10s, and 1000 time slots are equally divided into, often
The when a length of 10ms of a time slot.
Further seemingly, in one embodiment of the invention, the time slot is divided by function are as follows: when base station signal is monitored
Gap, central node time slot, central node change time slot, node data acquire time slot, child node ascending time slot, central node
Ascending time slot, balancing energy time slot and suspend mode time slot.
Further seemingly, in one embodiment of the invention, described group of network process further comprises: synchronous in the node
Afterwards, the timer of giving out a contract for a project for setting up a preset length at random, at the end of timer timing, node will send the networking of the node
Broadcast packet；After the completion of the timer selection of giving out a contract for a project, the node is opened and is monitored inside subnet, when concurrently setting default monitor
Between；Timing is completed in the timer of giving out a contract for a project, triggering node is sent into networking broadcast packet, is sent to networking broadcast packet, institute
It states node and comes back to listening mode, continued to execute according to process；If above-mentioned node receives network center's section in snoop procedure
The broadcast packet of point, the node will execute networking process according to the information of above-mentioned broadcast packet；If the node receives other sub- sections
Point rather than the networking broadcast packet of central node, then above-mentioned node will according to the central node Algorithms of Selecting calculate centromere
Point；If the node does not receive the networking broadcast packet of preset quantity, the address information and electricity in the networking broadcast packet are recorded
Information is measured, and comes back to listening state；If the node receives the networking broadcast packet of preset quantity to obtain central node,
The node will send broadcast packet immediately, and by all nodes in the information informing network of the central node；When the prison
Timer expiry is listened, then the node does not receive the broadcast packet of the central node in entire networking process；If the section
Quantity needed for the quantity of networking broadcast packet that point receives is not up to central node Algorithms of Selecting, then most nodes are not in network
It opens, is currently not suitable for building network, so execution is kept out of the way suspend mode algorithm by node；To the end of sleep procedure, reopen into
Net process.
Further seemingly, in one embodiment of the invention, the choice of dynamical of the central node further comprises: setting
The number of the passive wireless sensor node of the subnet is N, critical point k, and k=log2 N, receive the number of networking broadcast packet
Amount is m；After the child node receives networking broadcast packet, networking broadcast packet is parsed, by k=log2 N, k value is calculated, N is number of nodes
Mesh；If k is less than or equal to 1, the higher child node of energy is chosen as the central node；If k value is greater than 1 and receives
The quantity m of networking broadcast packet is less than k, then currently unsuitable building network, above-mentioned central node do not change；If k value is greater than 1 and receives
The quantity m of the networking broadcast packet arrived is greater than or equal to k, then the child node of the current ceiling capacity of node updates, will current maximum energy
The child node of amount returns to the identity information for the central node newly chosen as the central node.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the stream according to the rail traffic vehicles passive wireless sensor network node network-building method of the embodiment of the present invention
Cheng Tu；
Fig. 2 is the rail traffic vehicles passive wireless sensor network node network-building method according to one embodiment of the invention
Network architecture schematic diagram；
Fig. 3 is the rail traffic vehicles passive wireless sensor network node network-building method according to one embodiment of the invention
Time slot functional schematic；
Fig. 4 is the rail traffic vehicles passive wireless sensor network node network-building method according to one embodiment of the invention
Wake-up time slot schematic diagram；
Fig. 5 is the rail traffic vehicles passive wireless sensor network node network-building method according to one embodiment of the invention
Network construction flow diagram；
Fig. 6 is the rail traffic vehicles passive wireless sensor network node network-building method according to one embodiment of the invention
Networking process central node Algorithms of Selecting flow diagram；
Fig. 7 is the knot according to the rail traffic vehicles passive wireless sensor network node network device of the embodiment of the present invention
Structure schematic diagram.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing
The embodiment stated is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The rail traffic vehicles passive wireless sensor network proposed according to embodiments of the present invention is described with reference to the accompanying drawings
Node networking method and device describes the passive nothing of rail traffic vehicles proposed according to embodiments of the present invention with reference to the accompanying drawings first
Line sensor network nodes network-building method.
Fig. 1 is the process of the rail traffic vehicles passive wireless sensor network node network-building method of the embodiment of the present invention
Figure.
As shown in Figure 1, the rail traffic vehicles passive wireless sensor network node network-building method the following steps are included:
In step s101, passive sensor node is grouped according to quantity, communication distance factor, every group node packet
A central node and multiple child nodes are included, and mutually indepedent by different network numbers and communications band, to establish distribution
Passive wireless sensor network.
As shown in Fig. 2, in one embodiment of the invention, passive sensor node is by factors such as quantity, communication distances
It is grouped.Every group node constitutes a small distributed Star Network, is made of a central node with multiple child nodes.In
Heart node be responsible for uploading the convergence of child node, sensing data in the monitoring of ground base station signal, management coordination network with
And realize the balancing energy of network.It is realized independently of each other between network by the way that different network number and communications band is arranged.
In step s 102, timeslot scheduling is carried out to distributed passive wireless sensor network by superframe design, to hold
Row preset task.
In one embodiment of the invention, timeslot scheduling is carried out to distributed network by superframe design, further wrapped
It includes: by being time-multiplexed distributed passive wireless sensor network access protocol, wherein the period of superframe a length of 10s, and it is flat
It is divided into 1000 time slots, the when a length of 10ms of each time slot.Time slot, which is divided by function, monitors time slot, center for base station signal
When node broadcasts time slot, central node change time slot, node data acquisition time slot, child node ascending time slot, central node uplink
Gap, balancing energy time slot and suspend mode time slot.
Specifically, sensor node mainly orderly executes each task according to timeslot number as shown in Figures 3 and 4, in network
Main task in superframe has:
Step 1: central node monitors base station signal time slot.Slot offset amount is 1.Central node periodically wakes up and asks
Gateway synchronization information is sought, it, can be to child node will be sent to when receiving gateway and issuing the temporal information in gateway notice
Broadcast packet is updated.Child node passes through ascending time slot mapping selection oneself according to the network state in the broadcast packet of source node
Sending time slots and send data.
Step 2: central node broadcast capability time slot.Slot offset amount is 2.Central node is broadcasted by periodicity sending
Packet, provides temporal information, inbound information, network state information etc. for other passive sensor child nodes in same network.Son section
Point carries out time synchronization by the information in broadcast packet, and network belonging to the central node is added.The network Later Zhou Dynasty, one of the Five Dynasties is added in child node
The phase property ground broadcast packet that sends of listening center node, and decides whether more switching network according to the network state information in broadcast packet
Central node, the data information that acquisition whether is sent to central node.
Step 3: central node changes time slot.Slot offset amount is 3.Child node judges net by central node broadcast packet
Whether network needs replacing central node, obtains the identity information of new central node.(1) if in central node broadcast packet it is inactive more
Node is changed, then central node change time slot will not be opened, and all nodes will in a dormant state in this time slot；(2) if centromere
Own identification can be converted into common child node, subsequent task by notice replacement central node, former central node in point broadcast packet
Process will be carried out according to the process of child node.
Step 4: network node data acquires function time slot.Slot offset range is 201-400.In node data acquisition
Gap stage, all nodes in network will carry out the acquisition of data.
Step 5: network child nodes ascending time slot.Slot offset range is 401-500.Child node is reflected by ascending time slot
Penetrate the sending time slots of algorithms selection oneself.In child node ascending time slot, child node executes task according to network state, sends and protects
It message living and sends datagram.
Step 6: central node ascending time slot.Slot offset range is 601-800.When in passive wireless sensor network
Node is in ground base station signal cover, and child node knows network state by the broadcast packet that central node is sent,
Ascending time slot sends data packet to central node.Central node is in the number that child node ascending time slot receives, parsing child node is sent
According to packet, and to the content-aggregated of data packet, it is sent to ground fixed reception device.
Step 7: central node balancing energy time slot.Slot offset amount is 801.In this time slot section, central node will start
Self-test.Vehicle-mounted passive wireless sensor network central node can assess self electric quantity situation, when electricity is lower than certain value, centromere
Point will obtain next central node by balancing energy algorithm, and the information of new central node is informed it by broadcast packet
His network node.
Step 8: slot offset range 4-200,501-600,802-1000 are fixed suspend mode time slots in superframe, in suspend mode
On time slot, the node in passive wireless sensor network is in Low-power-consumptiodormancy dormancy state, to save energy.When except fixed suspend mode
Outside gap, when time slot is not enabled, default is also executed into suspend mode.In addition, suspend mode time slot can be used as reserved time slot, to realize net
The subsequent Function Extension of network.
In step s 103, according to the size choice of dynamical center of distributed passive wireless sensor nodes energy
Node, to carry out networking and the balancing energy of distributed passive wireless sensor network.
Specifically, establishing train-ground communication and carrying out Networking Design, firstly, synchronizing process includes:
Step 1: for all node division regions, as shown, 16,4 section compartment node division be 3 region A, B,
C.Data, processing data can be acquired first after node is fully charged.It has handled data and one sleeping time, time master is set
Be used for the node charging time carry out it is fault-tolerant, the setting for changing the time needs actual test.
Step 2: after node wakes up herein, all nodes first turn on listening mode.The node of a-quadrant is initializing first
Time slot in one moment of random selection send broadcast, since GPS network pass has been always maintained at electricity, GPS network closes and receives node
Broadcast packet after, send and return to node with the packet of location information, and synchronize, initialize the time slot of time slot section.
Step 3: as shown in figure 3, the node for sending out broadcast first is arranged in next any time slot for the area A node
To receive time slot, broadcast is received to confirm synchronism.If do not synchronized, illustrate potentially conflicting, according to the broadcast newly received
It is synchronous；Other nodes initialize remaining area A and the area B, C time slot as sleep time slot after synchronizing；
Step 4: for the area B node, the time slot of oneself is initialized after synchronizing, the node of broadcast is next any wide
Sowing time gap is set as receiving time slot, receives broadcast to confirm synchronism；Initializing the area A residue time slot is to receive time slot,
Father's neighbor table is established, updates father's neighbor table after receiving broadcast；It initializes the area B and the area C residue time slot is sleep time slot, establish
Sub- neighbor table receives the sub- neighbor table of the area C node updates, and confirms the child node of oneself.
Step 5: for the area C node, the time slot of oneself is initialized after synchronizing, the node of broadcast is next any wide
Sowing time gap is set as receiving time slot, receives broadcast to confirm synchronism；Initializing the area A time slot is sleep time slot, when the area B broadcasts
Gap is to receive time slot；Father's neighbor table is established, updates father's neighbor table after receiving broadcast；Initializing the area C residue time slot is sleep
Time slot.
Establish train-ground communication mechanism process are as follows:
After step 1:A district center node periodic wakeup, synchronizing information request is sent to headstock gateway first.
Step 2: after headstock gateway receives the synchronization request from A district center node, returning to corresponding gateway notice, make
It obtains central node and reaches synchronous absolute clock T with gatewayabs.Then node synchronizing process is executed, so that the node of entire vehicle is kept
It is synchronous.
Step 3: it is logical that gateway is sent to issuing for roadside base station equipment when being handed down to node data packet, by affix node
Accuse time Tstart, i.e. expression node will be in TstartWhen the data packet of collection is sent to roadside base station gateway.
Step 4: after central node receives other child node data packets, one flag bit Seq of affix and a counter
The value of Counter, counter Counter are n, indicate that duplicate base station equipment to the ground is sent n times data packet by central node,
It is the data packet for being successfully received node in order to ensure ground base station equipment that this repeated and redundant mechanism, which is arranged, at the end of transmission,
Flag bit Seq is reset.
Further, in one embodiment of the invention, group network process includes: step 1: as shown in figure 5, same in node
After step process, the timer of length in a 10s is set up at random first, at the end of timer timing, node will send the node
Networking broadcast packet.
Step 2: networking is given out a contract for a project after the completion of timer selection, and node is opened and monitored inside subnet, concurrently sets the monitoring of 10s
Time.(1) if networking is given out a contract for a project, timer completes timing, and triggering node is sent networking broadcast packet.It has been sent to networking broadcast packet
Finish, node comes back to listening mode, continues to execute according to process.(2) if node has received network center in snoop procedure
The broadcast packet of node, node will execute networking process according to the information of broadcast packet.
Step 3:(1) if node receives other child nodes rather than the networking broadcast packet of central node, node is by basis
Central node Algorithms of Selecting calculates central node.(2) if unreceived enough networking broadcast packets, networking broadcast is recorded
Address information and information about power in packet, and come back to listening state；(3) if the quantity of the networking broadcast packet received is enough to obtain
Central node is taken, then the node will send broadcast packet immediately, all nodes in the relevant information informing network of central node.
Step 4: when monitoring timer expiry, showing that node does not receive the wide of central node in entire networking process
Broadcast packet.Quantity needed for if the quantity for the networking broadcast packet that node receives is not up to central node Algorithms of Selecting, then it represents that network
Middle majority node is not opened, and is currently not suitable for building network, so execution is kept out of the way suspend mode algorithm by node.To sleep procedure knot
Beam reopens networking process.
Wherein, central node choice of dynamical algorithm designs specifically:
As shown in fig. 6, by taking the inside group network process of single distributed network as an example, each node known network node it is total
Number.In central node Algorithms of Selecting process, the number of the passive wireless sensor node of subnet is denoted as N, and critical point is denoted as k,
And k=log2 N.The quantity for receiving networking broadcast packet is m.
When the passive and wireless node in distributed network enters networking stage, the passive bus of all startings will be networking
Broadcast packet sets a timer on 0 to 1000ms.Timer then after, node will send networking broadcast packet.Remaining when
Intermediate node is in listening state.When node receives networking broadcast packet, judge that central node is according to central node Algorithms of Selecting
It is no to choose successfully.The central node of generation will send declaration broadcast packet to other nodes, complete the synchronization and networking of network.Center
The Algorithms of Selecting process of node is as shown in figure 5, Algorithms of Selecting is described as follows:
Step 1: after node receives networking broadcast packet, networking broadcast packet is parsed, by k=log2 N, k value is calculated, N is number of nodes
Mesh.
Step 2: if fruit k is less than or equal to 1, indicating that the number of nodes in network is less, only there are two nodes, then choose energy
Measure node centered on higher node
Step 3: if the quantity m for the networking broadcast packet that k value is greater than 1 and receives is less than k, then it represents that current node broadcasts packets
Much smaller than interstitial content, indicate that most nodes are not opened in network, are currently not suitable for building network, central node does not change.
Step 4: if k value is greater than 1 and the quantity m of networking broadcast packet that receives is greater than or equal to k, node updates are currently most
The node of big energy by node centered on current ceiling capacity node, and returns to the identity information for the central node newly chosen.
In step S104, distributed passive wireless sensor network child nodes data collected are passed through into centromere
Point is summarized, and fixed base stations equipment is transmitted to the ground, to send data to server.
The rail traffic vehicles passive wireless sensor network node network-building method of the embodiment of the present invention, by passive biography
Sensor node is grouped the distributed passive wireless sensor network of foundation, and carries out network superframe design to it, with center
Node choice of dynamical algorithm realizes that node is synchronous and Networking Design, to complete the transmission of data, effectively solve Node distribution extensively,
The problem of networking difficulty has the advantages that algorithm is simply easily realized, node power consumption is low, network performance is good.
The rail traffic vehicles passive wireless sensor network proposed according to embodiments of the present invention is described referring next to attached drawing
Node networking device.
Fig. 7 is the knot of the rail traffic vehicles passive wireless sensor network node network device of one embodiment of the invention
Structure schematic diagram.
As shown in fig. 7, the rail traffic vehicles passive wireless sensor network node network device 100 includes: to establish mould
Block 100, network superframe design module 200, networking and central node choice of dynamical module 300 and summarize transmission module 400.
Wherein, module 100 is established for being grouped according to quantity, communication distance factor to passive sensor node, often
Group node includes a central node and multiple child nodes, and mutually indepedent by different network numbers and communications band, to build
Vertical distribution passive wireless sensor network；Network superframe designs module 200 and is used to design by network superframe to distributed nothing
Source wireless sensor network carries out timeslot scheduling, to execute preset task；Networking and central node choice of dynamical module 300 are used for
According to the choice of dynamical of the size choice of dynamical central node of distributed passive wireless sensor nodes energy, to carry out
The networking of distributed passive wireless sensor network and balancing energy；And summarize transmission module 400 for will be distributed passive
Wireless sensor network child nodes data collected are summarized by central node, and fixed base stations equipment passes to the ground
It is defeated, to send data to server.The rail traffic vehicles passive wireless sensor network node network device 100, which has, to be calculated
Method simply easily realization, the advantage that node power consumption is low, network performance is good.
Further seemingly, in one embodiment of the invention, network superframe module 200 is by being time-multiplexed distributed nothing
Source wireless sensor network access protocol, wherein the period of superframe a length of 10s, and it is equally divided into 1000 time slots, each time slot
When a length of 10ms.
Further seemingly, in one embodiment of the invention, time slot is divided by function are as follows: base station signal monitoring time slot,
Central node time slot, central node change time slot, node data acquires time slot, on child node ascending time slot, central node
Row time slot, balancing energy time slot and suspend mode time slot.
Further seemingly, in one embodiment of the invention, group network process further comprises: after node synchronizes, at random
The timer of giving out a contract for a project for setting up a preset length, at the end of timer timing, node is by the networking broadcast packet of sending node；Give out a contract for a project
After the completion of timer selection, node is opened and is monitored inside subnet, concurrently sets default listening period；Giving out a contract for a project, timer completes meter
When, triggering node is sent into networking broadcast packet, is sent to networking broadcast packet, node comes back to listening mode, according to stream
Journey continues to execute；If above-mentioned node receives the broadcast packet of Network Central Node in snoop procedure, node will be according to above-mentioned broadcast
The information of packet executes networking process；If node receives other child nodes rather than the networking broadcast packet of central node, above-mentioned section
Point will calculate central node according to central node Algorithms of Selecting；If node does not receive the networking broadcast packet of preset quantity, record
Address information and information about power in networking broadcast packet, and come back to listening state；If node receives the networking of preset quantity
Broadcast packet is to obtain central node, then node will send broadcast packet immediately, and by the institute in the information informing network of central node
There is node；When monitoring timer expiry, then node does not receive the broadcast packet of central node in entire networking process；If node
Quantity needed for the quantity of the networking broadcast packet received is not up to central node Algorithms of Selecting, then most nodes are not opened in network
It opens, is currently not suitable for building network, so execution is kept out of the way suspend mode algorithm by node；To the end of sleep procedure, networking is reopened
Process.
Further seemingly, in one embodiment of the invention, the choice of dynamical of central node further comprises: setting subnet
Passive wireless sensor node number be N, critical point k, and k=log2 N, the quantity for receiving networking broadcast packet is m；Son
After node receives networking broadcast packet, networking broadcast packet is parsed, by k=log2 N, k value is calculated, N is interstitial content；If k be less than or
Equal to 1, then node centered on the higher child node of energy is chosen；If the quantity m of networking broadcast packet that k value is greater than 1 and receives
Less than k, then currently unsuitable building network, above-mentioned central node do not change；If k value is greater than 1 and the networking broadcast packet that receives
Quantity m is greater than or equal to k, then the child node of the current ceiling capacity of node updates, using the child node of current ceiling capacity as in
Heart node, and return to the identity information for the central node newly chosen.
It should be noted that aforementioned to rail traffic vehicles passive wireless sensor network node network-building method embodiment
The rail traffic vehicles passive wireless sensor network node network device for being also applied for the embodiment is illustrated, herein no longer
It repeats.
The rail traffic vehicles passive wireless sensor network node network device of the embodiment of the present invention, by passive biography
Sensor node is grouped the distributed passive wireless sensor network of foundation, and carries out network superframe design to it, with center
Node choice of dynamical algorithm realizes that node is synchronous and Networking Design, to complete the transmission of data, effectively solve Node distribution extensively,
The problem of networking difficulty has the advantages that algorithm is simply easily realized, node power consumption is low, network performance is good.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of rail traffic vehicles passive wireless sensor network node network-building method, which comprises the following steps:
Passive sensor node is grouped according to quantity, communication distance factor, every group node include central node and
Multiple child nodes, and it is mutually indepedent by different network numbers and communications band, to establish distributed passive wireless sensor net
Network；
Timeslot scheduling is carried out to the distributed passive wireless sensor network by superframe design, to execute preset task；
According to central node described in the size choice of dynamical of the distributed passive wireless sensor nodes energy, with into
The networking of the row distributed passive wireless sensor network and balancing energy；And
By child node data collected described in the distributed passive wireless sensor network by the central node into
Row summarizes, and fixed base stations equipment is transmitted to the ground, and the data are transmitted to server.
2. rail traffic vehicles passive wireless sensor network node network-building method according to claim 1, feature exist
In, it is described that timeslot scheduling is carried out to the distributed network by superframe design, further comprise:
By being time-multiplexed the distributed passive wireless sensor network access protocol, wherein the period of superframe is a length of
10s, and be equally divided into 1000 time slots, the when a length of 10ms of each time slot.
3. rail traffic vehicles passive wireless sensor network node network-building method according to claim 2, feature exist
In, the time slot be divided by function for base station signal monitor time slot, central node time slot, central node change time slot,
Node data acquires time slot, child node ascending time slot, central node ascending time slot, balancing energy time slot and suspend mode time slot.
4. rail traffic vehicles passive wireless sensor network node network-building method according to claim 1, feature exist
In described group of network process further comprises:
After the node synchronizes, the timer of giving out a contract for a project an of preset length is set up at random, and at the end of timer timing, node will
Send the networking broadcast packet of the node；
It is described give out a contract for a project timer selection after the completion of, the node is opened and is monitored inside subnet, and default listening period is concurrently set；
Timing is completed in the timer of giving out a contract for a project, triggering node is sent into networking broadcast packet, is sent to networking broadcast packet, the section
Point comes back to listening mode, continues to execute according to process；If above-mentioned node receives Network Central Node in snoop procedure
Broadcast packet, the node will execute networking process according to the information of above-mentioned broadcast packet；
If the node receives other child nodes rather than the networking broadcast packet of central node, above-mentioned node will be according in described
Heart node selection algorithm calculates central node；If the node does not receive the networking broadcast packet of preset quantity, described group is recorded
Address information and information about power in net broadcast packet, and come back to listening state；If the node receives the group of preset quantity
For net broadcast packet to obtain central node, then the node will send broadcast packet immediately, and the information of the central node is informed
All nodes in network；
When the monitoring timer expiry, then the node does not receive the broadcast of the central node in entire networking process
Packet；If quantity needed for the quantity for the networking broadcast packet that the node receives is not up to central node Algorithms of Selecting, in network
Most nodes are not opened, and are currently not suitable for building network, so execution is kept out of the way suspend mode algorithm by node；To sleep procedure knot
Beam reopens networking process.
5. rail traffic vehicles passive wireless sensor network node network-building method according to claim 1, feature exist
In being selected according to the dynamic that the size of the distributed passive wireless sensor nodes energy carries out the central node
It takes, to state networking and the balancing energy of distributed passive wireless sensor network described in progress, further comprises:
The number that the passive wireless sensor node of the subnet is arranged is N, critical point k, and k=log2 N, it is wide to receive networking
The quantity for broadcasting packet is m；
After the child node receives networking broadcast packet, networking broadcast packet is parsed, by k=log2 N, k value is calculated, N is interstitial content；
If k is less than or equal to 1, the higher child node of energy is chosen as the central node；
If the quantity m for the networking broadcast packet that k value is greater than 1 and receives is less than k, currently unsuitable building network, above-mentioned centromere
Point does not change；
If the quantity m for the networking broadcast packet that k value is greater than 1 and receives is greater than or equal to k, the son of the current ceiling capacity of node updates
Node using the child node of current ceiling capacity as the central node, and returns to the identity information for the central node newly chosen.
6. a kind of rail traffic vehicles passive wireless sensor network node network device characterized by comprising
Module is established, for being grouped according to quantity, communication distance factor to passive sensor node, every group node includes one
A central node and multiple child nodes, and it is mutually indepedent by different network numbers and communications band, it is distributed passive to establish
Wireless sensor network；
Network superframe designs module, when for being carried out by network superframe design to the distributed passive wireless sensor network
Gap scheduling, to execute preset task；
Networking and central node choice of dynamical module, for according to the distributed passive wireless sensor nodes energy
Size choice of dynamical described in central node choice of dynamical, to carry out the networking of the distributed passive wireless sensor network
And balancing energy；And
Summarize transmission module, for leading to child node data collected described in the distributed passive wireless sensor network
It crosses the central node to be summarized, and fixed base stations equipment is transmitted to the ground, and the data are transmitted to server.
7. rail traffic vehicles passive wireless sensor network node network device according to claim 6, feature exist
In the network superframe module is by being time-multiplexed the distributed passive wireless sensor network access protocol, wherein super
The period of frame a length of 10s, and be equally divided into 1000 time slots, the when a length of 10ms of each time slot.
8. rail traffic vehicles passive wireless sensor network node network-building method according to claim 7, feature exist
In the time slot is divided by function are as follows: base station signal monitor time slot, central node time slot, central node change time slot,
Node data acquires time slot, child node ascending time slot, central node ascending time slot, balancing energy time slot and suspend mode time slot.
9. rail traffic vehicles passive wireless sensor network node network-building method according to claim 6, feature exist
In described group of network process further comprises:
After the node synchronizes, the timer of giving out a contract for a project an of preset length is set up at random, and at the end of timer timing, node will
Send the networking broadcast packet of the node；
After the completion of the timer selection of giving out a contract for a project, the node is opened and is monitored inside subnet, concurrently sets default listening period；?
The timer of giving out a contract for a project completes timing, and triggering node is sent networking broadcast packet, is sent to networking broadcast packet, the node
Listening mode is come back to, is continued to execute according to process；If above-mentioned node receives the wide of Network Central Node in snoop procedure
Packet is broadcast, the node will execute networking process according to the information of above-mentioned broadcast packet；
If the node receives other child nodes rather than the networking broadcast packet of central node, above-mentioned node will be according in described
Heart node selection algorithm calculates central node；If the node does not receive the networking broadcast packet of preset quantity, described group is recorded
Address information and information about power in net broadcast packet, and come back to listening state；If the node receives the group of preset quantity
For net broadcast packet to obtain central node, then the node will send broadcast packet immediately, and the information of the central node is informed
All nodes in network；
When the monitoring timer expiry, then the node does not receive the broadcast of the central node in entire networking process
Packet；If quantity needed for the quantity for the networking broadcast packet that the node receives is not up to central node Algorithms of Selecting, in network
Most nodes are not opened, and are currently not suitable for building network, so execution is kept out of the way suspend mode algorithm by node；To sleep procedure knot
Beam reopens networking process.
10. rail traffic vehicles passive wireless sensor network node network-building method according to claim 6, feature exist
In the choice of dynamical of the central node further comprises:
The number that the passive wireless sensor node of the subnet is arranged is N, critical point k, and k=log2 N, it is wide to receive networking
The quantity for broadcasting packet is m；
After the child node receives networking broadcast packet, networking broadcast packet is parsed, by k=log2 N, k value is calculated, N is interstitial content；
If k is less than or equal to 1, the higher child node of energy is chosen as the central node；
If the quantity m for the networking broadcast packet that k value is greater than 1 and receives is less than k, currently unsuitable building network, above-mentioned centromere
Point does not change；
If the quantity m for the networking broadcast packet that k value is greater than 1 and receives is greater than or equal to k, the son of the current ceiling capacity of node updates
Node using the child node of current ceiling capacity as the central node, and returns to the identity information for the central node newly chosen.
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