CN105898882A - Data transmission method, sending terminal, reception terminal and data transmission system - Google Patents
Data transmission method, sending terminal, reception terminal and data transmission system Download PDFInfo
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- CN105898882A CN105898882A CN201610189040.4A CN201610189040A CN105898882A CN 105898882 A CN105898882 A CN 105898882A CN 201610189040 A CN201610189040 A CN 201610189040A CN 105898882 A CN105898882 A CN 105898882A
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000004044 response Effects 0.000 claims abstract description 14
- 238000012546 transfer Methods 0.000 claims description 37
- 230000001143 conditioned effect Effects 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/0858—Random access procedures, e.g. with 4-step access with collision treatment collision detection
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Abstract
The invention discloses a data transmission method, a sending terminal, a reception terminal and a data transmission system. The method includes setting a plurality of standby channels in advance, sending a data transmission request to the reception terminal directly using a determined current channel when the sending terminal has data transmission demand, using the channel for data transmission when there is response, switching to another standby channel to execute the previous steps when there is no response until preset condition (an available channel is determined, data transmission is completed or processing is overtime) is met. A data transmission request is sent directly to a current channel when data transmission demand exists, and no carrier sensing before data transmission is needed. When the current channel is busy or has interference, time-delay waiting is not necessarily, and another available channel is determined from other standby channels to transmit data. Real-time and anti-interference performance of data transmission is effectively guaranteed.
Description
Technical field
The invention belongs to wireless communication technology field, particularly relate to a kind of data transmission method, send terminal,
Receive terminal and data transmission system.
Background technology
At present, RF (Radio Freqency, radio frequency) communication employing CS (Carrier Sense, detect by carrier wave
Listen) anti-collision mechanism carries out data transmission, and uses this mechanism, and the RF network equipment is before sending signal, first
First carrier sense present channel is the busiest, if busy, then the when of postponing agreement, after date is sent out again week
Send.
The data transmission scheme using above mechanism has the disadvantage that 1) detected by carrier sense
In the case of channel busy, needing time delay to wait, the real-time of data transmission can not be guaranteed；2) if
The channel of carrier sense, always with the presence of interference signal, cannot send data the most always, thus data are transmitted
Interference free performance be not being met.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of data transmission method, send terminal, reception
Terminal and data transmission system, it is intended to by one preferably anti-collision mechanism, promote the reality of data transmission
Time property and interference free performance.
To this end, the present invention is disclosed directly below technical scheme:
A kind of data transmission method, is applied to send terminal, and described method includes:
When receiving data transfer instruction, use predetermined manner from predetermined more than one alternate channel
In determine that the first channel is as present channel；
Described present channel is used to send a data transfer request to receiving terminal；
Judge that whether receiving the reception terminal responds from described present channel in the first preset duration believes
Breath；
If it is, using described present channel is that destination channel sends target data to receiving terminal；
If it is not, then use described predetermined manner to determine from described alternate channel, second channel is as working as
Front channel, and it is described to return execution: using described present channel to send a data transmission to reception terminal please
Ask；Until meet first pre-conditioned time terminate.
Said method, it is preferred that described predetermined manner is polling mode, described first pre-conditioned for complete
The transmission or the wrap count that become described target data reach predetermined threshold value.
A kind of data transmission method, is applied to receive terminal, and described method includes:
Predetermined manner is used to determine that from predetermined more than one alternate channel the 3rd channel is as currently
Channel；
Judge that whether receiving the transmission terminal data from described present channel in the second preset duration passes
Defeated request；
If it is, use described present channel to carry out the data transmission and processing preset；
If it is not, then use described predetermined manner to determine from described alternate channel, the 4th channel is as working as
Front channel, and it is described to return execution: judge whether to receive in the second preset duration from described currently
The transmission terminal data transmission request of channel；Until meet second pre-conditioned time perform preset process.
Said method, it is preferred that the described present channel of described employing carries out the data transmission and processing bag preset
Include:
Described present channel is used to send respective acknowledgement information to described transmission terminal；
Use described present channel, receive the target data from described transmission terminal.
Said method, it is preferred that, described second pre-conditioned for complete described data transmission and processing or
Do not receive the data transfer request sending terminal, described default process in described second preset duration always
Including: continue to use described predetermined manner to detect each described alternate channel.
A kind of transmission terminal, including:
First determines module, for when receiving data transfer instruction, uses predetermined manner from predetermined
More than one alternate channel being determined, the first channel is as present channel；
Request sending module, is used for using described present channel to send a data transfer request to receiving terminal；
First judge module, for judging whether receive in the first preset duration from described current letter
The reception terminal responds information in road；
Data transmission blocks, for when described first judge module is for being, uses the described present channel to be
Destination channel sends target data to receiving terminal；
First control module, for when described first judge module is no, use described predetermined manner from
Described alternate channel is determined second channel as present channel, and return execution described request send mould
Block, and control described transmission terminal when meeting first and being pre-conditioned and terminate current processing procedure.
A kind of reception terminal, including:
Second determines module, for using predetermined manner to determine from predetermined more than one alternate channel
Go out the 3rd channel as present channel；
Second judge module, for judging whether receive in the second preset duration from described current letter
The transmission terminal data transmission request in road；
Data transmission and processing module, for when the judged result of described second judge module is for being, uses
Described present channel carries out the data transmission and processing preset；
Second control module, for when the judged result of described second judge module is no, uses described
Predetermined manner determine from described alternate channel the 4th channel as present channel, and it is described to return execution
Second judge module；And the default process of described reception terminal execution is controlled when meeting second and being pre-conditioned.
Above-mentioned reception terminal, it is preferred that described data transmission and processing module includes:
Response unit, is used for using described present channel to send respective acknowledgement information to described transmission terminal；
Data receipt unit, is used for using described present channel, receives the target from described transmission terminal
Data.
A kind of data transmission system, including sending terminal as above and receiving terminal as above.
Said system, it is preferred that described second preset duration T is:
T=t × N；
Wherein, described t represents described first preset duration, and described N represents the number of described alternate channel.
From above scheme, data transmission method disclosed in the present application, preset multiple alternate channel,
When sending terminal and having data transfer demands, the present channel determined directly is used to send to receiving terminal
Data transfer request, and use this channel to carry out data transmission when there being response, when nonreply, such as this
When channel exists data transfer task or interference signal, then jump to another alternate channel and re-execute above
Process, until meeting pre-conditioned (such as determine available channel and complete data transmission or process time-out)
Time terminate.Visible, application the application method directly can send to present channel when there being data transfer demands
Data transfer request, without carrying out carrier sense before transmitting the data and busy at present channel or deposit
When interference, it is not necessary to its time delay is waited, continue to determine an available channel also from other alternate channels
Carry out data transmission, real-time and the interference free performance of data transmission has been effectively ensured.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the data transmission method flow chart being applicable to send terminal disclosed in the embodiment of the present invention one；
Fig. 2 is the data transmission method flow chart being applicable to receive terminal disclosed in the embodiment of the present invention two；
Fig. 3 is the disclosed structural representation sending terminal of the embodiment of the present invention three；
Fig. 4 is the disclosed structural representation receiving terminal of the embodiment of the present invention four.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
For the data transmission scheme overcoming existing employing CS anti-collision mechanism to carry out data transmission have real-time
The defect such as property is low, interference free performance is low, the application provides a kind of data based on more excellent anti-collision mechanism to pass
Transmission scheme, the application scheme is applicable to the radio communication scenes such as RF communication, below will be by multiple embodiments
The application scheme is described in detail.
Embodiment one
The embodiment of the present invention one discloses a kind of data transmission method being applicable to send terminal, illustrates with reference to Fig. 1
Data transmission method flow chart, described method may comprise steps of；
S101: when receiving data transfer instruction, uses predetermined manner from predetermined more than one standby
With channel being determined, the first channel is as present channel.
S102: use described present channel to send a data transfer request to receiving terminal.
Being different from the carrier sense of prior art, the application provides a kind of channel based on multiple alternate channels
The anti-collision mechanism of frequency hopping, based on this, the present embodiment presets and is available for sending terminal, reception terminal is entered
N number of alternate channel of row data transmission, wherein, described N is the natural number more than 1.
When send terminal receive data transfer instruction (can be triggered by predetermined registration operation by transmitting terminal user,
Or based on corresponding timing mechanism triggering etc.), when there is data transfer demands, directly use predetermined manner from
The plurality of alternate channel selects an alternate channel as present channel, and utilize described current letter
Road sends a data transfer request, without carrying out carrier sense to receiving terminal.
Wherein, described predetermined manner can be that any foreseeable channel chooses mode, in the present embodiment,
Described predetermined manner specifically uses polling mode, i.e. transmission terminal is when there being data transfer demands, by presetting
Order selects a channel as present channel from multiple alternate channels, such as, having three standby letters
In the case of road channel one, channel two, channel three, can be according to the wheel of channel one → channel, two → channel three
Inquiry order, it is first determined go out channel one and make requests on the transmission of signal for present channel.
Described request signal can include sending terminal identification information and receiving terminal identification information, in order to
Receive terminal and utilize described reception terminal identification information, this signal is effectively distinguished with interference signal,
Simultaneously facilitate reception terminal and utilize described transmission terminal identification information, carry out answer signal to sending terminal
Feedback.
Correspondingly, described in the follow-up target data signal transmitted in corresponding alternate channel can include equally
Send terminal identification information and described reception terminal identification information.
S103: judge whether receive the reception terminal from described present channel in the first preset duration
Response message.
After sending terminal to selected present channel transmission data transfer request, when wait first is preset
It is long, if the answer signal receiving terminal, then table can be received in this duration by described present channel
Levy described present channel to leave unused, do not taken and do not exist interference signal by other-end signal, thus this letter
Road is available channel；On the contrary, if not receiving respective acknowledgement signal in described first preset duration,
Then characterize described present channel busy or exist interference signal.
Wherein, described first preset duration can be considered RF performance of network equipments and channel by technical staff
The reference factor sets itself such as transfer rate, in general, described first preset duration be not lower than below
Total time-consuming: alternate channel once sends terminal to the normal transmission consumption of the request signal receiving terminal
Time+response of reception terminal is time-consuming+alternate channel once receives terminal to the answer signal sending terminal
Normal transmission time-consuming.
S104: if it is, using described present channel is that destination channel sends number of targets to receiving terminal
According to.
If receiving response, the most described present channel is idle available, thus can be by true for described present channel
It is set to destination channel, carries out the transmission of this desired data.
S105: if it is not, then use described predetermined manner to determine second channel from described alternate channel
As present channel, and it is described to return execution: use described present channel to send data to receiving terminal
Transmission request；Until meet first pre-conditioned time terminate.
If not receiving response in described first preset duration, then characterize that described present channel is busy to be deposited
At data transfer task or existence interference signal, now, being different from prior art, described transmission terminal is not
This channel must be carried out time delay wait, but directly carry out frequency hopping, use described polling mode standby from each
With channel choosing other channels as present channel, such as, in the above examples, if at letter
Road one does not receives response, then continue to use polling mode, and ordinal selection channel two is as present channel.
And the described present channel again chosen is resend data transfer request attempt.
If receiving response, then characterizing the channel idle this time chosen can use, and otherwise continues frequency hopping and selects
Other channels (when being necessary, if each channel end of polling(EOP), can start the wheel of a new round
Ask) attempt, so circulate, until selecting an available channel from each alternate channel and completing
Required data terminate when transmitting, or wrap count exceedes predetermined threshold value and is judged to during communication failure terminate.
From above scheme, data transmission method disclosed in the present application, preset multiple alternate channel,
When sending terminal and having data transfer demands, the present channel determined directly is used to send to receiving terminal
Data transfer request, and use this channel to carry out data transmission when there being response, when nonreply, such as this
When channel exists data transfer task or interference signal, then jump to another alternate channel and re-execute above
Process, until meeting pre-conditioned (such as determine available channel and complete data transmission or process time-out)
Time terminate.Visible, application the application method directly can send to present channel when there being data transfer demands
Data transfer request, without carrying out carrier sense before transmitting the data and busy at present channel or deposit
When interference, it is not necessary to its time delay is waited, continue to determine an available channel also from other alternate channels
Carry out data transmission, real-time and the interference free performance of data transmission has been effectively ensured.
Embodiment two
The embodiment of the present invention two discloses a kind of data transmission method being applicable to receive terminal, illustrates with reference to Fig. 2
Data transmission method flow chart, described method may comprise steps of；
S201: the 3rd channel is made to use predetermined manner to determine from predetermined more than one alternate channel
For present channel；
S202: judge whether receive the transmission terminal from described present channel in the second preset duration
Data transfer request；
S203: if it is, use described present channel to carry out the data transmission and processing preset；
S204: if it is not, then use described predetermined manner to determine the 4th channel from described alternate channel
As present channel, and it is described to return execution: judge whether receive from institute in the second preset duration
State the transmission terminal data transmission request of present channel；Until meet second pre-conditioned time perform preset place
Reason.
Wherein, described second pre-conditioned for completing described data transmission and processing or when described second presets
Not receiving the data transfer request sending terminal in length, described default process includes always: continue to use
Described predetermined manner detects each described alternate channel.
Could communicate successfully with when receiving terminal and be simultaneously in same channel owing to sending terminal, therefore, connect
Receive terminal and need to carry out frequency hopping equally on each alternate channel, carry out channel with realization with transmission terminal and dock.
In the present embodiment, for guaranteeing the real-time reception of data signal, described reception terminal is constantly in data
Reception state, uses polling mode to carry out frequency hopping between each alternate channel.
When receiving terminal and determining that a certain channel is present channel based on described polling mode, detecting is described
Channel, and stop the second preset duration at described channel, send out if can be successfully received in this duration
Make arrangements for his funeral end request signal, then characterize described present channel and presently, there are data transfer task, thus suspend
Frequency hopping, resides in this channel and carries out data transmission processing, carry out response including to the request sending terminal,
And receive the transmission data sending terminal afterwards, until after the current data transfer task of this channel completes
It is further continued for frequency hopping.
If not receiving request signal in described second preset duration or only receiving interference signal, then characterize
Described present channel there is currently no data transfer task, thus can continue frequency hopping, continues other channels
Detect, to detect the data transfer task of respective channel in each alternate channel in time.
In the present embodiment, described second preset duration T=t × N, wherein, described t represents that described first presets
Duration, described N represents the number of described alternate channel.That is, described second preset duration is for sending terminal
To required total time-consuming of each alternate channel poll one time.
Embodiment three
The open one of the present embodiment sends terminal, with reference to the structural representation of the described transmission terminal shown in Fig. 3
Figure, described transmission terminal includes:
First determines module 301, for when receiving data transfer instruction, uses predetermined manner from predetermined
More than one alternate channel in determine that the first channel is as present channel；
Request sending module 302, being used for using described present channel to send a data transmission to reception terminal please
Ask；
First judge module 303, for judge whether to receive in the first preset duration from described currently
The reception terminal responds information of channel；
Data transmission blocks 304, for when described first judge module is for being, uses described present channel
Target data is sent to receiving terminal for destination channel；
First control module 305, for when described first judge module is no, uses described predetermined manner
Determine from described alternate channel second channel as present channel, and return execution described request send
Module 302, and control described transmission terminal when meeting first and being pre-conditioned and terminate current processing procedure.
For transmission terminal disclosed for the embodiment of the present invention three, count disclosed in itself and embodiment one
Corresponding according to transmission method, so describe is fairly simple, relevant similarity refers in embodiment one
The explanation of data transmission method part, the most no longer describes in detail.
Embodiment four
The open one of the present embodiment receives terminal, with reference to the structural representation of the described reception terminal shown in Fig. 4
Figure, described reception terminal includes:
Second determines module 401, is used for using predetermined manner true from predetermined more than one alternate channel
Make the 3rd channel as present channel；
Second judge module 402, for judge whether to receive in the second preset duration from described currently
The transmission terminal data transmission request of channel；
Data transmission and processing module 403, for when the judged result of described second judge module is for being, adopts
The data transmission and processing preset is carried out with described present channel；
Second control module 404, for when the judged result of described second judge module is no, uses institute
State predetermined manner determine from described alternate channel the 4th channel as present channel, and return execution institute
State the second judge module 402；And the default place of described reception terminal execution is controlled when meeting second and being pre-conditioned
Reason.
Wherein, described data transmission and processing module 403 includes:
Response unit, is used for using described present channel to send respective acknowledgement information to described transmission terminal；
Data receipt unit, is used for using described present channel, receives the target from described transmission terminal
Data.
For reception terminal disclosed for the embodiment of the present invention four, count disclosed in itself and embodiment two
Corresponding according to transmission method, so describe is fairly simple, relevant similarity refers in embodiment two
The explanation of data transmission method part, the most no longer describes in detail.
Embodiment five
The open a kind of data transmission system of the present embodiment five, this system includes the transmission as described in embodiment three
Terminal, and the reception terminal as described in embodiment four.In the system of the present embodiment, described transmission is eventually
End can be when there being data transfer demands, and directly the present channel selected by employing sends data to receiving terminal
Transmission request, without carrying out carrier sense before transmitting the data and busy at described present channel or deposit
When interference, it is not necessary to its time delay is waited, continue to determine an available channel also from other alternate channels
Carry out data transmission, thus when applying native system to carry out data transmission, can effectively ensure that data are transmitted
Real-time and interference free performance.
It should be noted that each embodiment in this specification all uses the mode gone forward one by one to describe, each
What embodiment stressed is all the difference with other embodiments, identical similar between each embodiment
Part see mutually.
For convenience of description, it is divided into various module or unit to divide with function when describing system above or device
Do not describe.Certainly, implement the application time can the function of each unit same or multiple softwares and/
Or hardware realizes.
As seen through the above description of the embodiments, those skilled in the art is it can be understood that arrive
The application can add the mode of required general hardware platform by software and realize.Based on such understanding,
The part that prior art is contributed by the technical scheme of the application the most in other words can be with software product
Form embody, this computer software product can be stored in storage medium, as ROM/RAM,
Magnetic disc, CD etc., including some instructions with so that computer equipment (can be personal computer,
Server, or the network equipment etc.) perform each embodiment of the application or some part institute of embodiment
The method stated.
Finally, in addition it is also necessary to explanation, in this article, such as first, second, third and fourth etc. it
The relational terms of class is used merely to separate an entity or operation with another entity or operating space,
And not necessarily require or imply and there is the relation of any this reality or suitable between these entities or operation
Sequence.And, term " includes ", " comprising " or its any other variant are intended to nonexcludability
Comprise, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process,
The key element that method, article or equipment are intrinsic.In the case of there is no more restriction, by statement " bag
Include one ... " key element that limits, it is not excluded that include the process of described key element, method, article or
Person's equipment there is also other identical element.
The above is only the preferred embodiment of the present invention, it is noted that general for the art
For logical technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a data transmission method, it is characterised in that being applied to send terminal, described method includes:
When receiving data transfer instruction, use predetermined manner from predetermined more than one alternate channel
In determine that the first channel is as present channel；
Described present channel is used to send a data transfer request to receiving terminal；
Judge that whether receiving the reception terminal responds from described present channel in the first preset duration believes
Breath；
If it is, using described present channel is that destination channel sends target data to receiving terminal；
If it is not, then use described predetermined manner to determine from described alternate channel, second channel is as working as
Front channel, and it is described to return execution: using described present channel to send a data transmission to reception terminal please
Ask；Until meet first pre-conditioned time terminate.
Method the most according to claim 1, it is characterised in that described predetermined manner is polling mode,
Described first pre-conditioned has been the transmission of described target data or wrap count reaches predetermined threshold value.
3. a data transmission method, it is characterised in that being applied to receive terminal, described method includes:
Predetermined manner is used to determine that from predetermined more than one alternate channel the 3rd channel is as currently
Channel；
Judge that whether receiving the transmission terminal data from described present channel in the second preset duration passes
Defeated request；
If it is, use described present channel to carry out the data transmission and processing preset；
If it is not, then use described predetermined manner to determine from described alternate channel, the 4th channel is as working as
Front channel, and it is described to return execution: judge whether to receive in the second preset duration from described currently
The transmission terminal data transmission request of channel；Until meet second pre-conditioned time perform preset process.
Method the most according to claim 3, it is characterised in that the described present channel of described employing enters
The data transmission and processing that row is preset includes:
Described present channel is used to send respective acknowledgement information to described transmission terminal；
Use described present channel, receive the target data from described transmission terminal.
Method the most according to claim 3, it is characterised in that described second pre-conditioned for completing
Described data transmission and processing or in described second preset duration always do not receive send terminal data pass
Defeated request, described default process includes: continue to use described predetermined manner to detect each described alternate channel.
6. one kind sends terminal, it is characterised in that including:
First determines module, for when receiving data transfer instruction, uses predetermined manner from predetermined
More than one alternate channel being determined, the first channel is as present channel；
Request sending module, is used for using described present channel to send a data transfer request to receiving terminal；
First judge module, for judging whether receive in the first preset duration from described current letter
The reception terminal responds information in road；
Data transmission blocks, for when described first judge module is for being, uses the described present channel to be
Destination channel sends target data to receiving terminal；
First control module, for when described first judge module is no, use described predetermined manner from
Described alternate channel is determined second channel as present channel, and return execution described request send mould
Block, and control described transmission terminal when meeting first and being pre-conditioned and terminate current processing procedure.
7. one kind receives terminal, it is characterised in that including:
Second determines module, for using predetermined manner to determine from predetermined more than one alternate channel
Go out the 3rd channel as present channel；
Second judge module, for judging whether receive in the second preset duration from described current letter
The transmission terminal data transmission request in road；
Data transmission and processing module, for when the judged result of described second judge module is for being, uses
Described present channel carries out the data transmission and processing preset；
Second control module, for when the judged result of described second judge module is no, uses described
Predetermined manner determine from described alternate channel the 4th channel as present channel, and it is described to return execution
Second judge module；And the default process of described reception terminal execution is controlled when meeting second and being pre-conditioned.
Reception terminal the most according to claim 7, it is characterised in that described data transmission and processing mould
Block includes:
Response unit, is used for using described present channel to send respective acknowledgement information to described transmission terminal；
Data receipt unit, is used for using described present channel, receives the target from described transmission terminal
Data.
9. a data transmission system, it is characterised in that include sending as claimed in claim 6 terminal,
And the reception terminal as described in claim 7-8 any one.
System the most according to claim 9, it is characterised in that described second preset duration T is:
T=t × N；
Wherein, described t represents described first preset duration, and described N represents the number of described alternate channel.
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| CN201610189040.4A CN105898882A (en) | 2016-03-29 | 2016-03-29 | Data transmission method, sending terminal, reception terminal and data transmission system |
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| CN201610189040.4A CN105898882A (en) | 2016-03-29 | 2016-03-29 | Data transmission method, sending terminal, reception terminal and data transmission system |
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| CN109451551A (en) * | 2018-11-20 | 2019-03-08 | 中国科学院上海微***与信息技术研究所 | A kind of fast channel-switching method in electric power wireless communication system |
| CN109933596A (en) * | 2019-02-27 | 2019-06-25 | 深圳市轱辘汽车维修技术有限公司 | A kind of method of data synchronization, device and terminal device |
| CN111315026A (en) * | 2018-12-12 | 2020-06-19 | 深圳市云海物联科技有限公司 | Channel selection method, device, gateway and computer readable storage medium |
| WO2021134238A1 (en) * | 2019-12-30 | 2021-07-08 | 华为技术有限公司 | Data sending method and device applied to bluetooth communication |
| CN113747598A (en) * | 2021-09-09 | 2021-12-03 | 华帝股份有限公司 | Communication method, terminal, host and smoke collection and discharge fan system |
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| CN111315026B (en) * | 2018-12-12 | 2023-09-05 | 深圳市云海物联科技有限公司 | Channel selection method, device, gateway and computer readable storage medium |
| CN109933596A (en) * | 2019-02-27 | 2019-06-25 | 深圳市轱辘汽车维修技术有限公司 | A kind of method of data synchronization, device and terminal device |
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