CN106912100A - Appliance network method for synchronizing time based on TPSN and TSync - Google Patents
Appliance network method for synchronizing time based on TPSN and TSync Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- H04J3/02—Details
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- H04J3/0635—Clock or time synchronisation in a network
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Abstract
The invention discloses a kind of appliance network method for synchronizing time based on TPSN and TSync, comprise the following steps：S1, set up a gps signal receiver in intelligent appliance, and using this intelligent appliance node as the root node of time synchronized, and establish or update root node；S2, determine source time：Set source time from (TG,TB,TS) obtain in three.S3, the selection method of synchronization.Appliance network method for synchronizing time based on TPSN and TSync of the present invention, for the determination of synchronous source time, without the single time source of selection, but be to combine gps signal receiver and the webserver and node internal clocks for different situations, take different time sources, and then causing that the validity of time synchronized is greatly improved, it is to avoid the time blind area of time synchronized, is a kind of to take different wireless network node method for synchronizing time for different situations.
Description
Technical field
The present invention relates to the Monitoring Data method for synchronizing time of intelligent appliance wireless network, it is related specifically to one kind and is based on
TPSN methods and TSync incorporation time synchronous method.
Background technology
At present, intelligent grid, is the new developing direction of power industry, and it is realized depending in real time, and accurately grasp power network is each
The information of individual link.Used as the household electricity network of " intelligent information perception tip ", for operation power, administrative department provides precisely
, the data of each electrical appliance operation information time synchronized will be the offer important motivity for promoting intelligent grid development.
From last century Mo to the beginning of this century, countries in the world start using information technology, microelectric technique and computer technology
Skill upgrading is carried out to conventional low electrical equipment, important breakthrough has technically been obtained, power grid user end electrical equipment is tentatively realized
Can communicate, Based Intelligent Control and network control.By computer network, accurately detect, calculate and monitor that user terminal electrically sets
Standby running status, makes distribution network reach optimal cooperation, greatly increase operation of power networks economy security and can
By property, and the system integration for user terminal electrical equipment, realize load monitoring, fault pre-alarming, Power quality management, electric energy pipe
The functions such as reason, the access of distributed new, the access of distributed energy storage device have established technical foundation.Two-way communication, two-way meter
Take and power network and the interaction of user, will also greatly improve efficiency of energy utilization.Therefore, smart power grid user end electrical equipment pair
The energy-conservation of intelligent grid, safe and reliable operation, exploitation, application to new energy are played highly important to raising energy efficiency
Effect, is the important component of strong intelligent grid.
Household energy management system refers to information and communication technology (ICT) as means, to realize consumer electronics management, monitoring
It is target with energy expenditure is reduced.Coordination for realizing each household electricity equipment is controlled, and reaches management objectives, each intelligence
The time synchronized of electrical equipment is essential.The time synchronized of each node of appliance network can be realized, for intelligent appliance
Related scientific research is also of great importance, and is set up for intelligent appliance moving model, and intelligent appliance fault diagnosis has critically important
Value.
In order that the Monitoring Data for obtaining all nodes of intelligent appliance network can be referred to mutually, it is easy to whole appliance network
Carry out Collaborative Control and home energy consumption optimization, it is therefore desirable to which time synchronized is carried out to all intelligent appliance nodes.Time is same
Monitoring Data after step will have scientific research value higher, can be that the design of household energy management system and correlative study are provided
More accurate rational data.
With the development of future society, the home appliance that smart home is included can be a lot, and some of them are pacified including fire-fighting
The equipment of full monitoring needs non-stop run, therefore in order to improve the reliability of time synchronized, increases time synchronized source time
Confidence level.
Therefore, the method for synchronizing time for designing a kind of each node of appliance network becomes people's problem demanding prompt solution.
The content of the invention
According to technical problem set forth above, and provide a kind of appliance network time synchronized side based on TPSN and TSync
Method, for solving to lack a kind of shortcoming of the method for synchronizing time of each node of reliable appliance network in the prior art.The present invention
The technological means of use is as follows：
A kind of appliance network method for synchronizing time based on TPSN and TSync, comprises the following steps：
S1, establishment root node：Set up a gps signal receiver in intelligent appliance, and using this intelligent appliance node as
The root node of time synchronized, has N number of node in setting radio sensing network, obtains the time of all nodes, gps time TG, net
Network server time TS, local root node time TB, and establish or update root node.
S2, determine source time：
Set source time from (TG,TB,TS) obtain in three；Work as TGEffectively, then TGHighest priority, as source time；When
TGIt is invalid, TSEffectively, then TSPriority is only second to TG, as source time；Work as TGIt is invalid, TSIt is invalid, then select TBAs source time.
S3, the selection method of synchronization：Synchronous complimentary fashion is synchronized using continuous synchronization and on demand；Continuous synchronization is used
TSync algorithms carry out time synchronized, are set in the stipulated time synchronously once；TPSN algorithms are synchronously used to carry out the time on demand same
Step, time synchronized is carried out according to user's unrestricted choice.
Following steps are specifically included as the establishment described in preferred steps S1 or the method for updating root node：
S11, temporary variable TtempRepresent, Ttemp=α × TS+β×TG, (alpha+beta)=1.
S12, work as TSAnd TGCan accurately obtain, then Ttemp=α × TS+β×TG, in the distribution of (alpha+beta)=1, wherein weights,
So that α=0.3, β=0.7.
Work as TSIt is obtained in that, and TGCannot obtain, then make TG=0, α=1, then Ttemp=TS。
Work as TGIt is obtained in that, and TSCannot obtain, then make TS=0, β=1, then Ttemp=TG。
Work as TGAnd TSCannot obtain, make TG=0, TS=0, then Ttemp=0.
S13, the internal clocking { T for obtaining N number of node in wireless network1,T2,T3……TN, then according to formula (1.1)
Calculate each internal clocking and TtempDifference minimum value：
{abs(T1-Ttemp),abs(T2-Ttemp),abs(T3-Ttemp),……abs(TN-Ttemp)}min (1.1)。
S14, as abs (TK-Ttemp) value it is minimum, then it is root node to choose k-th node；Work as Ttemp=0, then do not update
Root node.
As gps time T in preferred steps S2GAvailability deciding specifically include following steps：
- compare TGWith TBAnd TSBetween error, the maximum { abs (T of valueG-TS),abs(TG-TB)}max, when maximum is missed
The difference time is more than 10min, then assert that gps receiver breaks down, and then judge gps time TGIt is invalid.
- when time server breaks down or network interruption, then judge abs (TG-TB) whether it is more than 10min, work as abs
(TG-TB) it is more than 10min, then it is assumed that gps receiver breaks down, and then judges gps time TGIt is invalid.
- to the GPS receiver of nearest 30min times to time value carry out five difference operations,
{T1,T2,T3,T4……Tmax, wherein max counts out equivalent to all times obtained in the 30min times, if
Gps signal has not a particle of max=1800 if time missing, actual to be defined by the time data for storing,
First time difference operation is carried out, { T is obtained11,T12,T13,T1i……T1(max-1), wherein T1i=Ti+1-Ti, i=
(1,2,3,4……max-1)；
Carry out second difference operation, { T21,T22,T23,T2i……T2(max-2), wherein T2i=T1i+1-T1i, i=(1,2,
3,4……max-2)；
By that analogy, kth time difference operation, { Tk1,Tk2,Tk3,Tki……Tk(max-k), wherein Tki=T(k-1)i+1-
T(k-1)i, i=(1,2,3,4 ... max-k)；
Proceed to the result { T obtained by the 5th difference51,T52,T53,T5i……T5(max-5)}maxThen recognize if less than 1s
For the time T that gps signal is obtainedGEffectively, gps time T is otherwise abandonedGAs time source.
As webserver time T in preferred steps S2SAvailability deciding：
When under offline condition, the port network time cannot obtain, then webserver time TSIt is set to 0, TSIt is invalid.
When under networking situation, network time being obtained based on NTP addresss of service, wireless network internal time determines, Internet
Secondary discovery and foundation, specifically include following steps：
It is 1 that S21, root node set the level number of oneself.
S22, one packet of root node broadcast, ID and level number comprising root node.
S23, when the node in communication range receives packet, the stratum level of oneself is set to middle-level number of packet
Plus 1.
The packet of the new ID comprising oneself of S24, receiving node broadcast and level number, the node for receiving is with same
Mode sets the level number of oneself.
S25, repeat step S24, until the node in whole network all sets up the hierarchy levels of oneself, wherein having had levels
Number node when receiving the packet of broadcast again, do and ignore treatment.
The last level set up of S26, hypothesis is k layers, and the node number of { 1,2,3 ... k } layer is { n1,n2,
n3,……nk, total node number is N, then the probability for calculating each layer is set to { p1,p2,p3,……pkBe respectively
S27, the desired value of internal node time is calculated according to different probability, each layer choosing takes a node, so
The failure of layer interior joint is avoided, their time respectively { T is obtained1i,T2i,T3i……Tki, in this time subscript 1i≤
n1,2i≤n2,3i≤n3,……ki≤nk, the time that calculates is expected
Internal clocking { the T of N number of node in S27, wireless network1,T2,T3……TNExpect E with the timeTCarry out difference meter
Calculate, the minimum time { abs (T of error1-ET),abs(T2-ET),abs(T3-ET),……abs(TN-ET)}minAs wireless network
The source time of internal clocking.
It is to be carried out by two kinds of algorithms of HRTS and ITR together as the TSync algorithms described in continuous synchronization in preferred steps 3
Step, HRTS is that synchronous root node sends synchronizing signal and synchronizes, and ITR is sent together to neighbor node by common node
Step request, and a kind of method of synchronization of root node is finally passed the requests to, both complement each other, while operation, belongs to actively
Synchronous and request is synchronous complementary.
Following steps are synchronously specifically included as preferably described HRTS algorithms：
S311, root node broadcast a sync_begin beacon in control channel in time t1.
The child node that S312, root node are randomly assigned jumps to the clock channel specified and is replied, such as n2.
S313, node n2 reply to the reception time t2 and t3 of root node oneself in time t3.
The timestamp t4 that S314, root node record are received, such root node possesses all of timestamps of t1-t4.
S315, root node calculate time d2, then broadcast t2, d2 to control channel all nodes, wherein
S316, it is all close on child node, such as n2, n3, n4, n5 compare time t2 and receive timestamp t2', such as n3
Calculate time drift d'd'=t2-t2'.
S317, the time adjustment of node n3 are T=t+d2+d', and wherein t is the local zone time of n3 nodes；
S318, node n2, n3, n4, n5 initialization sync_begin beacons give their downstream node, repeat to walk above
Suddenly.
Following steps are synchronously specifically included as preferably described ITR algorithms：
S321, node n1 send ITR_QUERY signals in control channel, send the clock channel of synchronization request in ITR_
It is designated in QUERY.
After S322, the father node n2 of node n1 receive request, ITR_ACK signals can be sent in control channel and notify its father
It is root node BS in node, this instance graph；Generally, upstream father node can always send ITR_ACK signals until reaching
Root node.
The father node BS of S323, node n2, after receiving ITR_ACK, is transformed into the clock channel specified, clock channel letter
Breath is included in ITR_ACK；The clock channel specified all is transformed into along all nodes on ITR_ACK propagation paths.
S324, node n2 receive the synchronization request of n1, and node BS is sent to by specified clock channel.
S325, node BS initiate the same process transmission time and give node n1.
The time of the time synchronized oneself that S326, node n1 feed back according to node BS.
Include level discovery phase and same step as the algorithms of synchronization TPSN on demand described in continuous synchronization in preferred steps 3
Section, the level discovery phase, each node possesses the level number of oneself, the network structure with level is regarded as spanning tree,
Specifically include following steps：
S331, the root node of tree serve as clock source node, if its level number is 0.
S332, one packet of root node broadcast, ID and level number comprising root node.
S333, when the node in communication range receives packet, it is middle-level that the stratum level of oneself is set into packet
Number Jia 1.
The packet of the new ID comprising oneself of S334, receiving node broadcast and level number, the node for receiving is with same
Mode the level number of oneself is set.
S335, repeat step S334, until the node in whole network all sets up the hierarchy levels of oneself, the number of having levels
Node when receiving the packet of broadcast again, do and ignore treatment.
The synchronous phase specifically includes following steps：
The level number of S341, node R and node S is respectively kth floor and the floor of kth+1, when synchronous, upper layer node R broadcast one
Individual time synchronized request packet, notifies that S nodes carry out the preparation of time synchronized.
S342, node S by after one section of wait of random time, in T1Moment sends to node R contains moment T1Synchronization
Packet.
After S343, node R receive packet, reception time T is recorded using local clock2, then have：T2=T1+Δ+
D, wherein, Δ represents the time migration between node, and d represents the propagation delay time of message.
S344, node R are in the same way in moment T3A confirmation message is sent to node S, (T is included in the message1、
T2、T3)。
S345, node S are in T4Moment records the time T for receiving message with local zone time4, meet：T4=T3- Δ+d, its
In, Δ represents the time migration between node, and d represents the propagation delay time of message；By formula T2=T1+ Δ+d and T4=T3- Δ+d is obtained
Arrive：
With
S346, according to the result of calculation of step S345 change node time be consistent.
Compared with prior art, the appliance network method for synchronizing time based on TPSN and TSync of the present invention,
Without the single time source of selection, but it is to combine gps signal receiver for the determination of synchronous source time in step S1
Different situations is directed to the webserver and node internal clocks, different time sources is taken, and then cause time synchronized
Validity greatly improve, it is to avoid the time blind area of time synchronized.
In step s 2, five differential techniques are employed for the availability deciding of gps time, and for wireless network inside
Time takes and first establishes network layer, and then the number of nodes according to network layer is come allocation probability value, and then calculates expectation
Value obtains the time with more reliability.
The time server address of multiple is have chosen as standby for the acquisition of webserver time, with China national
The time at time service center is used as first.After the acquisition of source time, there is provided different priority, with gps time priority most
Height, webserver time time sum local zone time priority is minimum to determine source time according to different situations.
The basis after source time is determined, in step S3, user selects different Time synchronization algorithms to determine to carry out
Continuous time synchronous still time synchronized on demand, continuous time is synchronously cycle lock in time shorter method for synchronizing time, when
Between sync interval be set to 0.5 hour or 1 hour, TSync synchronized algorithms are by University of Colorado Richard Han and Hui
What Dai was proposed, be a kind of flexible, self-organizing, the time synchronized service without fixed network topological structure and transmission delay.
It is then synchronously on demand the demand according to user, determines lock in time, does not have certain time interval, it is synchronous on demand to adopt
Take the method for synchronizing time of TPSN agreements.
Two kinds of uses of Time synchronization algorithm, carried out according to the characteristics of two kinds of algorithms, comprehensive two kinds of algorithms
Advantage, TSync synchronized algorithms are a kind of lightweight algorithms, and convergence is fast, and the time is short, are adapted to continuous synchronization.The speed of TPSN algorithms
Slowly, reliability is high, is adapted to synchronous on demand.
Appliance network method for synchronizing time based on TPSN and TSync of the present invention is a kind of for different feelings
Shape takes different wireless network node method for synchronizing time.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is time synchronized overall flow figure of the present invention.
Fig. 2 is that flow chart is established and updated to root node of the present invention.
Fig. 3 is the flow chart that source time of the present invention determines.
Fig. 4 is the decision method flow chart of gps clock validity of the present invention.
Fig. 5 is the determination flow chart of inventive network inside source time.
Fig. 6 is the HRTS phase flow figures of TSync algorithms of the present invention.
Fig. 7 is the ITR phase flow figures of TSync algorithms of the present invention.
Fig. 8 is d2 schematic diagram calculations of the present invention.
Fig. 9 is TPSN algorithms level discovery phase flow chart of the present invention.
Figure 10 is TPSN algorithms synchronous phase schematic diagram of the present invention.
Specific embodiment
As shown in figure 1, a kind of appliance network method for synchronizing time based on TPSN and TSync, comprises the following steps：
S1, establishment root node：A gps signal receiver is set up in intelligent appliance (such as air-conditioning), and with this intelligent family
Electrical nodes have N number of node as the root node of time synchronized in setting radio sensing network, obtain the time of all nodes, GPS
Time TG, webserver time TS, local root node time TB, and establish or update root node.
As shown in Fig. 2 the method for the establishment or renewal root node described in step S1 specifically includes following steps：
S11, temporary variable TtempRepresent, reduced time contrast is carried out as internal nodes of network with this time variable
Benchmark, this variable is closely related with gps time and webserver time, therefore sets the time as gps time and net
Network server time is weighted calculating the time after being added, and weight coefficient is respectively α and β, because the fiducial time is necessary
It is close to each other with gps time and webserver time, therefore weight coefficient sum is 1.
Temporary variable Ttemp=α × TS+β×TG, (alpha+beta)=1.
S12, work as TSAnd TGCan accurately obtain, then Ttemp=α × TS+β×TG, in the distribution of (alpha+beta)=1, wherein weights,
So that α=0.3, β=0.7.
Work as TSIt is obtained in that, and TGCannot obtain, then make TG=0, α=1, then Ttemp=TS。
Work as TGIt is obtained in that, and TSCannot obtain, then make TS=0, β=1, then Ttemp=TG。
Work as TGAnd TSCannot obtain, make TG=0, TS=0, then Ttemp=0.
S13, the internal clocking { T for obtaining N number of node in wireless network1,T2,T3……TN, then according to formula (1.1)
Calculate each internal clocking and TtempDifference minimum value：
{abs(T1-Ttemp),abs(T2-Ttemp),abs(T3-Ttemp),……abs(TN-Ttemp)}min (1.1)。
S14, as abs (TK-Ttemp) value it is minimum, then it is root node to choose k-th node；Work as Ttemp=0, then do not update
Root node.
In step sl, without the single time source of selection, but it is to combine GPS for the determination of synchronous source time
Signal receiver and the webserver and node internal clocks are directed to different situations, take different time sources, and then make
The validity of time synchronized greatly improves, it is to avoid the time blind area of time synchronized.
S2, determine source time：
As shown in figure 3, setting source time from (TG,TB,TS) obtain in three；
Work as TGEffectively, then TGHighest priority, as source time.
As shown in figure 4, gps time T in step S2GAvailability deciding specifically include following steps：
- compare TGWith TBAnd TSBetween error, the maximum { abs (T of valueG-TS),abs(TG-TB)}max, when maximum is missed
The difference time is more than 10min, then assert that gps receiver breaks down, and then judge gps time TGIt is invalid.
- when time server breaks down or network interruption, then judge abs (TG-TB) whether it is more than 10min, work as abs
(TG-TB) it is more than 10min, then it is assumed that gps receiver breaks down, and then judges gps time TGIt is invalid.
- to the GPS receiver of nearest 30min times to time value carry out five difference operations,
{T1,T2,T3,T4……Tmax, wherein max counts out equivalent to all times obtained in the 30min times, if
Gps signal has not a particle of max=1800 if time missing, actual to be defined by the time data for storing,
First time difference operation is carried out, { T is obtained11,T12,T13,T1i……T1(max-1), wherein T1i=Ti+1-Ti, i=
(1,2,3,4……max-1)；
Carry out second difference operation, { T21,T22,T23,T2i……T2(max-2), wherein T2i=T1i+1-T1i, i=(1,2,
3,4……max-2)；
By that analogy, kth time difference operation, { Tk1,Tk2,Tk3,Tki……Tk(max-k), wherein Tki=T(k-1)i+1-
T(k-1)i, i=(1,2,3,4 ... max-k)；
Proceed to the result { T obtained by the 5th difference51,T52,T53,T5i……T5(max-5)}maxThen recognize if less than 1s
For the time T that gps signal is obtainedGEffectively, gps time T is otherwise abandonedGAs time source.
Work as TGIt is invalid, TSEffectively, then TSPriority is only second to TG, as source time.
Webserver time T in step S2SAvailability deciding：
When under offline condition, the port network time cannot obtain, then webserver time TSIt is set to 0, TSIt is invalid.
When under networking situation, network time server is selected：
Generally network time is obtained with following NTP addresss of service
Server ntp-sop.inria.frserver 210.72.145.44 (China national time service central server IP
Address)
server 133.100.11.8prefer
server 210.72.145.44
server 203.117.180.36
server 131.107.1.10
server 64.236.96.53
server 130.149.17.21
server 66.92.68.246
server www.freebsd.org
server 18.145.0.30
server clock.via.net
server 137.92.140.80
server 133.100.9.2
server 128.118.46.3
server ntp.nasa.gov
server 129.7.1.66
The acquisition of network time, obtains from China national time service center first, secondly can just be obtained from other address acquisitions
Take.
Network time is obtained based on NTP addresss of service, wireless network internal time determines, as shown in figure 5, network layer
It was found that and set up, as shown in figure 9, specifically including following steps：
It is 1 that S21, root node set the level number of oneself.
S22, one packet of root node broadcast, ID and level number comprising root node.
S23, when the node in communication range receives packet, the stratum level of oneself is set to middle-level number of packet
Plus 1.
The packet of the new ID comprising oneself of S24, receiving node broadcast and level number, the node for receiving is with same
Mode sets the level number of oneself.
S25, repeat step S24, until the node in whole network all sets up the hierarchy levels of oneself, wherein having had levels
Number node when receiving the packet of broadcast again, do and ignore treatment.
The last level set up of S26, hypothesis is k layers, and the node number of { 1,2,3 ... k } layer is { n1,n2,
n3,……nk, total node number is N, then the probability for calculating each layer is set to { p1,p2,p3,……pkBe respectively
S27, the desired value of internal node time is calculated according to different probability, each layer choosing takes a node, so
The failure of layer interior joint is avoided, their time respectively { T is obtained1i,T2i,T3i……Tki, in this time subscript 1i≤
n1,2i≤n2,3i≤n3,……ki≤nk, the time that calculates is expected
Internal clocking { the T of N number of node in S27, wireless network1,T2,T3……TNExpect E with the timeTCarry out difference meter
Calculate, the minimum time { abs (T of error1-ET),abs(T2-ET),abs(T3-ET),……abs(TN-ET)}minAs wireless network
The source time of internal clocking.
Work as TGIt is invalid, TSIt is invalid, then select TBAs source time, TBIt is local root node time, i.e., when inside wireless network
Between.
In step s 2, five differential techniques are employed for the availability deciding of gps time, and for wireless network inside
Time takes and first establishes network layer, and then the number of nodes according to network layer is come allocation probability value, and then calculates expectation
Value obtains the time with more reliability.
The time server address of multiple is have chosen as standby for the acquisition of webserver time, with China national
The time at time service center is used as first.After the acquisition of source time, there is provided different priority, with gps time priority most
Height, webserver time time sum local zone time priority is minimum to determine source time according to different situations.
S3, the selection method of synchronization：Synchronous complimentary fashion is synchronized using continuous synchronization and on demand.
Continuous synchronization carries out time synchronized using TSync algorithms, and continuous synchronization refers to shorter synchronization of time intenals, is set to
Synchronization once, is usually arranged as 0.5 hour or 1 hour synchronously once, using TSync algorithms to whole node net in stipulated time
Network carries out time synchronized.
It is synchronous on demand that time synchronized is carried out using TPSN algorithms, the one kind outside continuous synchronization is synchronously then independently of on demand
The method of synchronization, a kind of method of synchronization of time synchronized is carried out according to user's unrestricted choice, and is synchronously had no effect on demand continuous
The operation of synchronized algorithm.
TSync algorithms in step 3 described in continuous synchronization are synchronized by two kinds of algorithms of HRTS and ITR, HRTS
Synchronous root node sends synchronizing signal and synchronizes, and ITR is to send synchronization request to neighbor node by common node,
And a kind of method of synchronization of root node is finally passed the requests to, both complement each other, while operation, belong to active synchronization and please
Step of seeking common ground is complementary.
In some cases, the active synchronization scenario based on HRTS algorithms, successfully can not obtain synchronization node too
Many situations, therefore, ITR as HRTS supplement, there is provided a kind of each sensor node independently obtains time and and all
Enclose a kind of need-based method for synchronizing time of context synchronization.
As shown in fig. 6, described HRTS algorithms synchronously specifically include following steps：
S311, root node broadcast a sync_begin beacon in control channel in time t1, shown in such as Fig. 6-(a).
The child node that S312, root node are randomly assigned jumps to the clock channel specified and is replied, such as n2.
S313, node n2 reply to the reception time t2 and t3 of root node oneself in time t3, shown in such as Fig. 6-(b).
The timestamp t4 that S314, root node record are received, such root node possesses all of timestamps of t1-t4.
S315, root node calculate time d2, the parameter involved by d2 Computing Principles, as shown in figure 8, t2 is then broadcasted, d2
To all nodes of control channel, shown in such as Fig. 6-(c), wherein
S316, it is all close on child node, such as n2, n3, n4, n5 compare time t2 and receive timestamp t2', such as n3
Calculate time drift d'd'=t2-t2'.
S317, the time adjustment of node n3 are T=t+d2+d', and wherein t is the local zone time of n3 nodes.
S318, node n2, n3, n4, n5 initialization sync_begin beacons give their downstream node, repeat to walk above
Suddenly.
As shown in fig. 7, described ITR algorithms synchronously specifically include following steps：
S321, node n1 send ITR_QUERY signals in control channel, send the clock channel of synchronization request in ITR_
It is designated in QUERY, such as shown in Fig. 7-(a).
After S322, the father node n2 of node n1 receive request, ITR_ACK signals can be sent in control channel and notify its father
Node, is root node BS in this instance graph 7；Generally, upstream father node can always send ITR_ACK signals until reaching
Shown in root node, such as Fig. 7-(b).
The father node BS of S323, node n2, after receiving ITR_ACK, is transformed into the clock channel specified, clock channel letter
Breath is included in ITR_ACK；The clock channel specified all is transformed into along all nodes on ITR_ACK propagation paths.
S324, node n2 receive the synchronization request of n1, and node BS is sent to by specified clock channel, and such as Fig. 7-
Shown in (c).
S325, node BS initiate the same process transmission time and give node n1.
The time of the time synchronized oneself that S326, node n1 feed back according to node BS.
As shown in figure 9, the algorithms of synchronization TPSN on demand in step 3 described in continuous synchronization include level discovery phase and synchronization
Stage；The level discovery phase, each node possesses the level number of oneself, and the network structure with level is regarded as generation
Tree, specifically includes following steps：
S331, the root node of tree serve as clock source node, if its level number is 0.
S332, one packet of root node broadcast, ID and level number comprising root node.
S333, when the node in communication range receives packet, it is middle-level that the stratum level of oneself is set into packet
Number Jia 1.
The packet of the new ID comprising oneself of S334, receiving node broadcast and level number, the node for receiving is with same
Mode the level number of oneself is set.
S335, repeat step S334, until the node in whole network all sets up the hierarchy levels of oneself, the number of having levels
Node when receiving the packet of broadcast again, do and ignore treatment, realize the foundation of TPSN topological structures.
Such as Figure 10, the synchronous phase specifically includes following steps：
The level number of S341, node R and node S is respectively kth floor and the floor of kth+1, when synchronous, upper layer node R broadcast one
Individual time synchronized request packet, notifies that S nodes carry out the preparation of time synchronized.
S342, node S by after one section of wait of random time, in T1Moment sends to node R contains moment T1Synchronization
Packet.
After S343, node R receive packet, reception time T is recorded using local clock2, then have：T2=T1+Δ+
D, wherein, Δ represents the time migration between node, and d represents the propagation delay time of message.
S344, node R are in the same way in moment T3A confirmation message is sent to node S, (T is included in the message1、
T2、T3)。
S345, node S are in T4Moment records the time T for receiving message with local zone time4, meet：T4=T3- Δ+d, its
In, Δ represents the time migration between node, and d represents the propagation delay time of message；By formula T2=T1+ Δ+d and T4=T3- Δ+d is obtained
Arrive：
With
S346, according to the result of calculation of step S345 change node time be consistent.
Time synchronization process of the present invention will be carried out according to the flow in specific steps content, each method for synchronizing time
Priority must not change.
The basis after source time is determined, in step S3, user selects different Time synchronization algorithms to determine to carry out
Continuous time synchronous still time synchronized on demand, continuous time is synchronously cycle lock in time shorter method for synchronizing time, when
Between sync interval be set to 0.5 hour or 1 hour, TSync synchronized algorithms are by University of Colorado Richard Han and Hui
What Dai was proposed, be a kind of flexible, self-organizing, the time synchronized service without fixed network topological structure and transmission delay.
It is then synchronously on demand the demand according to user, determines lock in time, does not have certain time interval, it is synchronous on demand to adopt
Take the method for synchronizing time of TPSN agreements.
Two kinds of uses of Time synchronization algorithm, carried out according to the characteristics of two kinds of algorithms, comprehensive two kinds of algorithms
Advantage, TSync synchronized algorithms are a kind of lightweight algorithms, and convergence is fast, and the time is short, are adapted to continuous synchronization.The speed of TPSN algorithms
Slowly, reliability is high, is adapted to synchronous on demand.
The present invention realizes the household electrical appliances wireless network time synchronous method based on TPSN methods and the synchronization of TSync incorporation times,
Fully utilize external gps clock, three kinds of times of network time server and intelligent appliance internal clocking to originate, for not
With situation use different method for synchronizing time, it is to avoid the appearance of time synchronized blank time section, it is ensured that intelligent appliance
The reliability and accuracy of monitoring data time data.
Gps clock source of the present invention is can be arranged on gps signal reception device out of doors, indoor GPS
Signal cannot function as clock signal source.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept is subject to equivalent or change, should all be included within the scope of the present invention.
Claims (8)
1. a kind of appliance network method for synchronizing time based on TPSN and TSync, it is characterised in that comprise the following steps：
S1, establishment root node：A gps signal receiver is set up in intelligent appliance, and using this intelligent appliance node as the time
Synchronous root node, has N number of node in setting radio sensing network, obtains the time of all nodes, gps time TG, network clothes
Business device time TS, local root node time TB, and establish or update root node；
S2, determine source time：
Set source time from (TG,TB,TS) obtain in three；
Work as TGEffectively, then TGHighest priority, as source time；
Work as TGIt is invalid, TSEffectively, then TSPriority is only second to TG, as source time；
Work as TGIt is invalid, TSIt is invalid, then select TBAs source time；
S3, the selection method of synchronization：
Synchronous complimentary fashion is synchronized using continuous synchronization and on demand；
Continuous synchronization carries out time synchronized using TSync algorithms, is set in the stipulated time synchronously once；
It is synchronous on demand that time synchronized is carried out using TPSN algorithms, time synchronized is carried out according to user's unrestricted choice.
2. the appliance network method for synchronizing time based on TPSN and TSync according to claim 1, it is characterised in that：
The method of establishment or renewal root node described in step S1 specifically includes following steps：
S11, temporary variable TtempRepresent, Ttemp=α × TS+β×TG, (alpha+beta)=1；
S12, work as TSAnd TGCan accurately obtain, then Ttemp=α × TS+β×TG, in the distribution of (alpha+beta)=1, wherein weights so that
α=0.3, β=0.7；
Work as TSIt is obtained in that, and TGCannot obtain, then make TG=0, α=1, then Ttemp=TS；
Work as TGIt is obtained in that, and TSCannot obtain, then make TS=0, β=1, then Ttemp=TG；
Work as TGAnd TSCannot obtain, make TG=0, TS=0, then Ttemp=0；
S13, the internal clocking { T for obtaining N number of node in wireless network1,T2,T3……TN, then calculate every according to formula (1.1)
One internal clocking and TtempDifference minimum value：
{abs(T1-Ttemp),abs(T2-Ttemp),abs(T3-Ttemp),……abs(TN-Ttemp)}min(1.1)；
S14, as abs (TK-Ttemp) value it is minimum, then it is root node to choose k-th node；
Work as Ttemp=0, then do not update root node.
3. the appliance network method for synchronizing time based on TPSN and TSync according to claim 1 and 2, it is characterised in that：
Gps time T in step S2GAvailability deciding specifically include following steps：
- compare TGWith TBAnd TSBetween error, the maximum { abs (T of valueG-TS),abs(TG-TB)}max, when worst error
Between be more than 10min, then assert that gps receiver breaks down, and then judge gps time TGIt is invalid；
- when time server breaks down or network interruption, then judge abs (TG-TB) whether it is more than 10min, as abs (TG-
TB) it is more than 10min, then it is assumed that gps receiver breaks down, and then judges gps time TGIt is invalid；
- to the GPS receiver of nearest 30min times to time value carry out five difference operations,
{T1,T2,T3,T4……Tmax, wherein max counts out equivalent to all times obtained in the 30min times, if GPS believes
Max=1800 if time missing number is had not a particle of, it is actual to be defined by the time data for storing,
First time difference operation is carried out, { T is obtained11,T12,T13,T1i……T1(max-1), wherein T1i=Ti+1-Ti, i=(1,2,3,
4……max-1)；
Carry out second difference operation, { T21,T22,T23,T2i……T2(max-2), wherein T2i=T1i+1-T1i, i=(1,2,3,
4……max-2)；
By that analogy, kth time difference operation, { Tk1,Tk2,Tk3,Tki……Tk(max-k), wherein Tki=T(k-1)i+1-T(k-1)i, i=
(1,2,3,4……max-k)；
Proceed to the result { T obtained by the 5th difference51,T52,T53,T5i……T5(max-5)}maxThen think GPS if less than 1s
The time T of signal acquisitionGEffectively, gps time T is otherwise abandonedGAs time source.
4. the appliance network method for synchronizing time based on TPSN and TSync according to claim 3, it is characterised in that：
Webserver time T in step S2SAvailability deciding：
When under offline condition, the port network time cannot obtain, then webserver time TSIt is set to 0, TSIt is invalid；
When under networking situation, based on NTP addresss of service acquisition network time,
The determination of wireless network internal time,
The discovery of network layer and foundation, specifically include following steps：
It is 1 that S21, root node set the level number of oneself；
S22, one packet of root node broadcast, ID and level number comprising root node；
S23, when the node in communication range receives packet, the stratum level of oneself is set into middle-level number of packet Jia 1；
The packet of the new ID comprising oneself of S24, receiving node broadcast and level number, the node for receiving is in the same way
The level number of oneself is set；
S25, repeat step S24, until the node in whole network all sets up the hierarchy levels of oneself, wherein the number of having levels
When node receives the packet of broadcast again, do and ignore treatment；
The last level set up of S26, hypothesis is k layers, and the node number of { 1,2,3 ... k } layer is { n1,n2,n3,……nk, always
Node number is N, then the probability for calculating each layer is set to { p1,p2,p3,……pkBe respectively
S27, the desired value of internal node time is calculated according to different probability, each layer choosing takes a node, obtain them
Time be respectively { T1i,T2i,T3i……Tki, { 1i≤n in this time subscript1,2i≤n2,3i≤n3,……ki≤nk, meter
Evaluation time is expected
Internal clocking { the T of N number of node in S27, wireless network1,T2,T3……TNExpect E with the timeTMathematic interpolation is carried out, by mistake
Minimum time { abs (the T of difference1-ET),abs(T2-ET),abs(T3-ET),……abs(TN-ET)}minInside wireless network
The source time of clock.
5. the appliance network method for synchronizing time based on TPSN and TSync according to claim 1, it is characterised in that：
TSync algorithms in step 3 described in continuous synchronization are synchronized by two kinds of algorithms of HRTS and ITR, and HRTS is same
Step root node sends what synchronizing signal was synchronized, and ITR is to send synchronization request to neighbor node by common node, and most
A kind of method of synchronization of root node is passed the requests to eventually, both complement each other, while operation, belongs to active synchronization and request is same
Step is complementary.
6. the appliance network method for synchronizing time based on TPSN and TSync according to claim 5, it is characterised in that：
Described HRTS algorithms synchronously specifically include following steps：
S311, root node broadcast a sync_begin beacon in control channel in time t1；
The child node that S312, root node are randomly assigned jumps to the clock channel specified and is replied, such as n2；
S313, node n2 reply to the reception time t2 and t3 of root node oneself in time t3；
The timestamp t4 that S314, root node record are received, such root node possesses all of timestamps of t1-t4；
S315, root node calculate time d2, then broadcast t2, d2 to control channel all nodes, the computational methods of d2, formula
S316, it is all close on child node, such as n2, n3, n4, n5 compare time t2 and receive timestamp t2', and such as n3 is calculated
Time drift d'd'=t2-t2'；
S317, the time adjustment of node n3 are T=t+d2+d', and wherein t is the local zone time of n3 nodes；
S318, node n2, n3, n4, n5 initialization sync_begin beacons give their downstream node, repeat above step.
7. the appliance network method for synchronizing time based on TPSN and TSync according to claim 5 or 6, it is characterised in that：
Described ITR algorithms synchronously specifically include following steps：
S321, node n1 send ITR_QUERY signals in control channel, send the clock channel of synchronization request in ITR_
It is designated in QUERY；
After S322, the father node n2 of node n1 receive request, ITR_ACK signals can be sent in control channel and notify that its father saves
Point, upstream father node can always send ITR_ACK signals until reaching root node；
The father node BS of S323, node n2, after receiving ITR_ACK, is transformed into the clock channel specified, clock channel packet
It is contained in ITR_ACK；The clock channel specified all is transformed into along all nodes on ITR_ACK propagation paths；
S324, node n2 receive the synchronization request of n1, and node BS is sent to by specified clock channel；
S325, node BS initiate the same process transmission time and give node n1；
The time of the time synchronized oneself that S326, node n1 feed back according to node BS.
8. the appliance network method for synchronizing time based on TPSN and TSync according to claim 1, it is characterised in that：
The algorithms of synchronization TPSN on demand in step 3 described in continuous synchronization include level discovery phase and synchronous phase；
The level discovery phase, each node possesses the level number of oneself, and the network structure with level is regarded as spanning tree,
Specifically include following steps：
S331, the root node of tree serve as clock source node, if its level number is 0；
S332, one packet of root node broadcast, ID and level number comprising root node；
S333, receive packet when the node in communication range, by the stratum level of oneself be set to middle-level number of packet plus
1；
The packet of the new ID comprising oneself of S334, receiving node broadcast and level number, the node for receiving is with same side
Formula sets the level number of oneself；
S335, repeat step S334, until the node in whole network all sets up the hierarchy levels of oneself, the section of the number of having levels
When point receives the packet of broadcast again, do and ignore treatment；
The synchronous phase specifically includes following steps：
The level number of S341, node R and node S is respectively kth floor and the floor of kth+1, when synchronous, when upper layer node R broadcasts one
Between synchronization request packet, notify that S nodes carry out the preparation of time synchronized；
S342, node S by after one section of wait of random time, in T1Moment sends to node R contains moment T1Synchronizing information
Bag；
After S343, node R receive packet, reception time T is recorded using local clock2, then have：T2=T1+ Δ+d, its
In, Δ represents the time migration between node, and d represents the propagation delay time of message；
S344, node R are in the same way in moment T3A confirmation message is sent to node S, (T is included in the message1、T2、
T3)；
S345, node S are in T4Moment records the time T for receiving message with local zone time4, meet：T4=T3- Δ+d, wherein, Δ
The time migration between node is represented, d represents the propagation delay time of message；By formula T2=T1+ Δ+d and T4=T3- Δ+d is obtained：
With
S346, according to the result of calculation of step S345 change node time be consistent.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109150359A (en) * | 2018-09-30 | 2019-01-04 | 珠海格力电器股份有限公司 | A kind of method for synchronizing time and device of air-conditioner set |
| CN110061797A (en) * | 2019-05-29 | 2019-07-26 | 海尔优家智能科技（北京）有限公司 | Method for synchronizing time, device, storage medium and computer equipment |
| WO2019242131A1 (en) * | 2018-06-19 | 2019-12-26 | 佛山市顺德区美的电热电器制造有限公司 | Clock synchronization method and device, and computer storage medium |
| CN111769895A (en) * | 2019-04-01 | 2020-10-13 | 西安诺瓦电子科技有限公司 | Multi-device timing method and system and device timing method and device |
| CN112769517A (en) * | 2021-01-14 | 2021-05-07 | 武汉光庭信息技术股份有限公司 | T-BOX time synchronization method and device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110164607A1 (en) * | 2003-03-27 | 2011-07-07 | Qualcomm Incorporated | Virtual real-time clock based on time information from multiple communication systems |
| US20120082173A1 (en) * | 2010-10-05 | 2012-04-05 | Laurence Fischer | Clock synchronization |
| CN102412957A (en) * | 2011-12-05 | 2012-04-11 | 上海电器科学研究院 | High-precision synchronous clock adjusting method |
| CN102769870A (en) * | 2011-05-05 | 2012-11-07 | 苏州两江科技有限公司 | Low-energy-consumption time synchronization method of wireless sensor networks |
| CN103746762A (en) * | 2013-11-29 | 2014-04-23 | 中国矿业大学 | Wireless sensor network time synchronization method layered as required |
| CN104378193A (en) * | 2013-08-16 | 2015-02-25 | 北京卓越信通电子股份有限公司 | Time synchronization system and method, exchanger and embedded interface board |
| CN104754722A (en) * | 2013-12-26 | 2015-07-01 | 中国科学院沈阳自动化研究所 | Time synchronization method oriented to hierarchical heterogeneous network |
-
2017
- 2017-03-14 CN CN201710150367.5A patent/CN106912100B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110164607A1 (en) * | 2003-03-27 | 2011-07-07 | Qualcomm Incorporated | Virtual real-time clock based on time information from multiple communication systems |
| US20120082173A1 (en) * | 2010-10-05 | 2012-04-05 | Laurence Fischer | Clock synchronization |
| CN102769870A (en) * | 2011-05-05 | 2012-11-07 | 苏州两江科技有限公司 | Low-energy-consumption time synchronization method of wireless sensor networks |
| CN102412957A (en) * | 2011-12-05 | 2012-04-11 | 上海电器科学研究院 | High-precision synchronous clock adjusting method |
| CN104378193A (en) * | 2013-08-16 | 2015-02-25 | 北京卓越信通电子股份有限公司 | Time synchronization system and method, exchanger and embedded interface board |
| CN103746762A (en) * | 2013-11-29 | 2014-04-23 | 中国矿业大学 | Wireless sensor network time synchronization method layered as required |
| CN104754722A (en) * | 2013-12-26 | 2015-07-01 | 中国科学院沈阳自动化研究所 | Time synchronization method oriented to hierarchical heterogeneous network |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019242131A1 (en) * | 2018-06-19 | 2019-12-26 | 佛山市顺德区美的电热电器制造有限公司 | Clock synchronization method and device, and computer storage medium |
| CN109150359A (en) * | 2018-09-30 | 2019-01-04 | 珠海格力电器股份有限公司 | A kind of method for synchronizing time and device of air-conditioner set |
| CN111769895A (en) * | 2019-04-01 | 2020-10-13 | 西安诺瓦电子科技有限公司 | Multi-device timing method and system and device timing method and device |
| CN111769895B (en) * | 2019-04-01 | 2023-09-12 | 西安诺瓦星云科技股份有限公司 | Multi-device timing method and system and device timing method and device |
| CN110061797A (en) * | 2019-05-29 | 2019-07-26 | 海尔优家智能科技（北京）有限公司 | Method for synchronizing time, device, storage medium and computer equipment |
| CN112769517A (en) * | 2021-01-14 | 2021-05-07 | 武汉光庭信息技术股份有限公司 | T-BOX time synchronization method and device |
| CN112769517B (en) * | 2021-01-14 | 2024-01-12 | 武汉光庭信息技术股份有限公司 | T-BOX time synchronization method and device |
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