CN105788207A - Wireless data transmission method and device - Google Patents
Wireless data transmission method and device Download PDFInfo
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- CN105788207A CN105788207A CN201610113127.3A CN201610113127A CN105788207A CN 105788207 A CN105788207 A CN 105788207A CN 201610113127 A CN201610113127 A CN 201610113127A CN 105788207 A CN105788207 A CN 105788207A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/061—Indicating or recording devices for remote indication
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Abstract
An embodiment of the invention discloses a wireless data transmission method and device and improves the problem that wireless data transmission of a gas meter in the prior art cannot be performed effectively in a residential area with many floors and complex floors.The wireless data transmission method comprises the steps that whether to-be-transmitted data exist in the gas meter is monitored; the to-be-transmitted data are subjected to spectrum spreading treatment when existing in the gas meter; the transmission rate corresponding to the frequency spectrum of the spectrum-spread to-be-transmitted data is found in a pre-stored database; the spectrum-spread to-be-transmitted data are transmitted according to the transmission rate.The gas meter data transmission reliability and the transmission distance can be improved remarkably with the wireless data transmission method, and the wireless data transmission method and device is easy for popularization and application.
Description
Technical field
The present invention relates to gas meter technical field, in particular to radio data transmission method and the device of a kind of gas meter.
Background technology
Gas meter is the electronic device with automatic charging function, use gas meter can understand the gas consumption of monitored user easily, and automatically can examine and make cuts according to the user institute gas consumption that the tolerance that user buys and monitoring draw obtain user residue can gas consumption, use more convenient, range of application is wider.Along with the development of technology, the data drawn mostly are wirelessly transferred by each gas meter now, but gas meter adopts transmission range when being wirelessly transferred extremely limited.Such as: gas meter adopts 1.2Kbps baud rate, simulating transmitting machine frequency modulation, and for ± 15KHz, (the modulation minimum busy channel bandwidth of signal is 2*15KHz=60KHz, receiver intermediate-frequency filter bandwidth > 69KHz), when response 470Mhz～510Mhz frequency, the synchronous head of 8 bytes, the valid data of 40 bytes, shift keying modulation pattern carry out wireless data transmission, wireless data transmission distance is generally upper and lower at 8 floor layers, community many at floor, that floor is complicated, gas meter can not effectively carry out wireless data transmission.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is in that to provide a kind of radio data transmission method and device, to improve in prior art the problem that the community that gas meter is many at floor, floor is complicated can not effectively carry out wireless data transmission.
To achieve these goals, the technical scheme that the embodiment of the present invention adopts is as follows:
Embodiments providing a kind of radio data transmission method, be applied to gas meter, described method includes:
Monitor and whether described gas meter exists data to be launched；
When described gas meter exists data to be launched, described data to be launched are carried out spread processing；
The transfer rate corresponding with the frequency spectrum of the data described to be launched after spread spectrum is found out from the data base prestored；
By described transfer rate, the data described to be launched after spread spectrum are launched.
Preferred as one, described method also includes:
The redundancy supervision code element for realizing error correction, error detection is increased by preset rules after the information sequence of described data to be launched；
Described by described transfer rate, the step that the data described to be launched after spread spectrum carry out launching is included:
By described transfer rate by spread spectrum and increase described redundancy supervision code element after data described to be launched launch.
Preferred as another kind, described by described transfer rate, the step that the data described to be launched after spread spectrum carry out launching is included:
Two and two or more channel is used to synchronize the data described to be launched after spread spectrum are launched by described transfer rate；
The transmission process of each channel in monitoring said two and two or more channel；
When monitoring show that in said two and two or more channel, arbitrary channel completes the transmission of the data described to be launched after spread spectrum, send the control instruction stopping transmission to all the other channels.
Preferred as another, described by described transfer rate, the step that the data described to be launched after spread spectrum carry out launching is included:
The multiple channels prestored are monitored, selecting at least one from the plurality of channel and be absent from same frequency according to transmission channel as described data to be launched of the channel that is being transmitted, described same frequency is according to for using same class frequency to carry out the data launched with described data to be launched；
By described transfer rate, the data described to be launched after spread spectrum are launched by described transmission channel.
Further, described from the plurality of channel, select at least one be absent from same frequency and include as the step of the transmission channel of described data to be launched according to the channel that is being transmitted:
Select a channel as the preselected transport channel of described data to be launched from the multiple channels prestored；
Judge whether described preselected transport channel exists same frequency according to being transmitted；
When described preselected transport channel existing same frequency according to when being transmitted, from the multiple channels prestored, reselect another channel preselected transport channel as described data to be launched；
Return execution is described judges whether there is same frequency in described preselected transport channel according to being transmitted and when there is same frequency in described preselected transport channel according to when being transmitted, another channel step as the preselected transport channel of described data to be launched is reselected from the multiple channels prestored, until judging to draw and described preselected transport channel being absent from same frequency according to being transmitted, there will be no same frequency according to the described preselected transport channel being the transmitted transmission channel as described data to be transmitted.
Further, described from the plurality of channel, select at least one be absent from same frequency and include as the step of the transmission channel of described data to be launched according to the channel that is being transmitted:
Select a channel as the preselected transport channel of described data to be launched from the multiple channels prestored；
Judge whether described preselected transport channel exists same frequency according to being transmitted；
When described preselected transport channel existing same frequency according to when being transmitted, same frequency data-transfer process in described preselected transport channel is monitored, after same frequency wireless data transmission in described preselected transport channel completes, using the described preselected transport channel transmission channel as described data to be transmitted.
As preferably, described method includes:
Launch with the speed of 244.14bps after described data to be launched are spread to the bandwidth of 125khz.
On the basis of the above, the embodiment of the present invention additionally provides a kind of wireless data transmission device, is applied to gas meter, and described wireless data transmission device includes:
Monitoring means, is used for monitoring in described gas meter whether there are data to be launched；
Processing unit, for when the monitoring of described monitoring means draws and there are data to be launched in described gas meter, carrying out spread processing to described data to be launched；
Search unit, for finding out the transfer rate corresponding with the frequency spectrum of the data described to be launched after spread spectrum from the data base prestored；
Transmitter unit, for launching the data described to be launched after spread spectrum by described transfer rate.
Further, also include:
Code element increases unit, for increasing the redundancy supervision code element for realizing error correction, error detection by preset rules after the information sequence of described data to be launched；
Described transmitter unit, specifically for by described transfer rate by spread spectrum and increase described redundancy supervision code element after data described to be launched launch.
Further, described transmitter unit includes:
Multichannel launches subelement, for using two and two or more channel to synchronize the data described to be launched after spread spectrum are launched by described transfer rate；
Monitoring the process subelement, for monitoring the transmission process of each channel in said two and two or more channel；
Control subelement, for when monitoring show that in said two and two or more channel, arbitrary channel completes the transmission of the data described to be launched after spread spectrum, sending the control instruction stopping transmission to all the other channels.
Compared with prior art, the radio data transmission method provided in the embodiment of the present invention and device, carry out the data to be launched in gas meter being transmitted by the speed corresponding with the frequency spectrum after spread spectrum again after spreading gain (also known as processing gain) processes, pass through spreading gain, weaken the requirement to signal to noise ratio in being wirelessly transferred, improve capacity of resisting disturbance when data are transmitted in gas meter and frequency band reusability, add the distance of data transmission in gas meter, the community that, floor many at floor is complicated remains able to be effectively taking place wireless data transmission.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, it is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, the accompanying drawing used required in embodiment will be briefly described below, it is to be understood that, the following drawings illustrate only certain embodiments of the present invention, therefore the restriction to scope it is not construed as, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.
Fig. 1 illustrates the schematic flow sheet of a kind of radio data transmission method that the embodiment of the present invention provides.
Fig. 2 illustrates the schematic flow sheet of the another kind of radio data transmission method that the embodiment of the present invention provides.
Fig. 3 illustrates the schematic flow sheet of the another kind of radio data transmission method that the embodiment of the present invention provides.
Fig. 4 illustrates the schematic flow sheet of the another kind of radio data transmission method that the embodiment of the present invention provides.
Fig. 5 illustrates a kind of schematic flow sheet selecting transmission channel that the embodiment of the present invention provides.
Fig. 6 illustrates that the another kind that the embodiment of the present invention provides selects the schematic flow sheet of transmission channel.
Fig. 7 illustrates the structural representation of a kind of wireless data transmission device that the embodiment of the present invention provides.
Fig. 8 illustrates the structural representation of the another kind of wireless data transmission device that the embodiment of the present invention provides.
Fig. 9 illustrates the structural representation of the another kind of wireless data transmission device that the embodiment of the present invention provides.
Figure 10 illustrates the application scenarios schematic diagram of a kind of wireless data transmission device that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Generally can with various different configurations arrange and design with the assembly of the embodiment of the present invention that illustrate described in accompanying drawing herein.Therefore, below the detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit claimed the scope of the present invention, but is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
Embodiments provide a kind of radio data transmission method, be applied to gas meter, as it is shown in figure 1, described method includes:
Step S101: monitor and whether there are data to be launched in described gas meter.
Wherein, according to practical situation, data to be launched can be multiple.Such as: can be that gas meter can gas consumption according to the residue that the air volume calculation detected draws.Again such as: the use gas form etc. of the user section period that can draw for gas meter statistics.
After gas meter draws above-mentioned data to be launched, data to be launched can be stored in a memorizer 901, it is possible to send data to be launched to a communicator, for transmission.Correspondingly, if in use, memorizer 901 is written into data or communicator receives data, can determine that there are data to be launched.
Described data to be launched are carried out spread processing by step S102: when there are data to be launched in described gas meter.
Step S103: find out the transfer rate corresponding with the frequency spectrum of the data described to be launched after spread spectrum from the data base prestored.
During enforcement, different according to gas meter local environment, the bandwidth after data spread spectrum to be launched and transfer rate can be set flexibly.Such as: the bandwidth after predeterminable multiple optional spread spectrums, and transfer rate corresponding with the bandwidth after spread spectrum respectively.Again such as: for each gas meter, bandwidth and transfer rate after spread processing all can be selected by user in advance, or by communication chip default setting.
Step S104: the data described to be launched after spread spectrum are launched by described transfer rate.
In the embodiment of the present invention, in order to ensure transmission range, the transfer rate of the data to be launched after spread spectrum can be reduced.
Consider that wireless data exists diffraction, reflection, the wireless data interference of same frequency etc. in transmitting procedure, in order to ensure integrity and the safety of data transmission, as in figure 2 it is shown, in the embodiment of the present invention, it is preferable that described method also includes:
Step S201: increase the redundancy supervision code element for realizing error correction, error detection by preset rules after the information sequence of described data to be launched.
In the embodiment of the present invention, it is preferred to use Forward Error Correction coding techniques increases described redundancy supervision code element.
Correspondingly, perform step S202: by described transfer rate by spread spectrum and increase described redundancy supervision code element after data described to be launched launch.
In order to further ensure that the reliability and efficiency that data transmit, as it is shown on figure 3, in the embodiment of the present invention, it is preferable that by described transfer rate, the data described to be launched after spread spectrum are carried out transmitting and comprise the following steps.
Step S301: use two and two or more channel to synchronize the data described to be launched after spread spectrum are launched by described transfer rate.
During owing to carrying out data transmission, if only selecting some channel to be transmitted, it is possible to can there is the factors such as interference because of selected channel and cause data transmission fails to be launched.Thus, the present embodiment preferably employs multiple channel data syn-chronization to be launched is transmitted.
Step S302: the transmission process of each channel in monitoring said two and two or more channel.Step S303: when monitoring show that in said two and two or more channel, arbitrary channel completes the transmission of the data described to be launched after spread spectrum, send the control instruction stopping transmission to all the other channels.
In the embodiment of the present invention, completing the transmission of the data described to be launched after spread spectrum is preferably referred to, receiving terminal confirms to receive complete data to be transmitted.Whether the data that such as receiving terminal receives by same Forward Error Correction coding rule monitoring are correct, determining that the data received send to a confirmation feedback to gas meter after correct, gas meter sends, to all the other channels, the control instruction stopping transmitting after receiving this confirmation feedback.
As shown in Figure 4, in the embodiment of the present invention, it is preferable that described by described transfer rate, the data described to be launched after spread spectrum carried out transmitting and comprise the following steps.
Step S401: the multiple channels prestored are monitored, selecting at least one from the plurality of channel and be absent from same frequency according to transmission channel as described data to be launched of the channel that is being transmitted, described same frequency is according to for using same class frequency to carry out the data launched with described data to be launched.
In this step, select the mode of the channel of transmission to have multiple, the present embodiment will be illustrated in subsequent content, do not do too much elaboration in this step.
In actual applications, in order to improve frequency efficiency, increase the capacity of system, usually adopt channeling technology.Channeling refers to after separated by a distance, in given overlay area, there is the community of the same class frequency of many uses, and these communities are called co-frequency cell.Interference between co-frequency cell is called co-channel interference.Empirical tests, gas meter is when carrying out data transmission, co-channel interference is to affect the biggest factor of gas meter data transmission credibility, thus, whether the embodiment of the present invention exists same frequency evidence in main monitor channel, select the channel being absent from same frequency evidence as the transmission channel of data to be launched from multiple channels, to avoid co-channel interference, it is ensured that the reliability of data to be launched transmission.
When implementing, can pass through to test software such as NetworkStumbler and detect whether channel exists co-channel interference.Detect also by the communication chip with Channel Detection function.
Step S402: the data described to be launched after spread spectrum are launched by described transmission channel by described transfer rate.
Adopt the channel being absent from same frequency evidence that data to be launched are launched, be effectively ensured the success rate that the data to be launched in gas meter are launched.
Embodiments provide following two from the plurality of channel, to select at least one be absent from same frequency according to implementation as the transmission channel of described data to be launched of the channel that is being transmitted.
The first, as it is shown in figure 5, comprise the following steps.
Step S501: select a channel as the preselected transport channel of described data to be launched from the multiple channels prestored.
Wherein, the mode selecting preselected transport channel is more, for instance: the channel preselected transport channel as described data to be launched can be randomly choosed from the multiple channels prestored.Again such as: can by default priority rule, according to priority sequencing selects a channel that priority is the highest as the preselected transport channel of described data to be launched from the multiple channels prestored.Again such as: dynamic channel allocation can be adopted, by channel quality criteria and portfolio parameter, channel resource is optimized configuration, selects channel flexibly.
Step S502: judge whether there is same frequency in described preselected transport channel according to being transmitted.
In this step, it is judged that the mode that whether there is same frequency evidence in channel is identical with step S401, thus does not repeat.
Step S503: when there is same frequency in described preselected transport channel according to when being transmitted, reselect another channel preselected transport channel as described data to be launched from the multiple channels prestored.
During enforcement, can be identified carrying out the same frequency channel according to transmission having determined that, when reselecting another channel as the preselected transport channel of data to be launched, it is preferable that choose in not identified channel.
Step S504: return execution is described judges whether there is same frequency in described preselected transport channel according to being transmitted and when there is same frequency in described preselected transport channel according to when being transmitted, another channel step as the preselected transport channel of described data to be launched is reselected from the multiple channels prestored, until judging to draw and described preselected transport channel being absent from same frequency according to being transmitted, there will be no same frequency according to the described preselected transport channel being the transmitted transmission channel as described data to be transmitted.
It should be noted that, it is judged as the channel carrying out same frequency according to transmission, same frequency may be completed within a short period of time according to transmission, thus becoming idle channel, thus, selecting at least one from the plurality of channel, to be absent from same frequency as follows as the second implementation of the transmission channel of described data to be launched according to the channel that is being transmitted.
The second, as shown in Figure 6, comprises the following steps.
Step S601: select a channel as the preselected transport channel of described data to be launched from the multiple channels prestored；
In this step, the selection mode of channel is identical with step S501, thus does not repeat.
Step S602: judge whether there is same frequency in described preselected transport channel according to being transmitted.
In this step, it is judged that the mode that whether there is same frequency evidence in channel is identical with step S401, thus does not repeat.
Step S603: when there is same frequency in described preselected transport channel according to when being transmitted, same frequency data-transfer process in described preselected transport channel is monitored, same frequency in described preselected transport channel is according to after being transmitted, using the described preselected transport channel transmission channel as described data to be transmitted.
In this step, preselected transport channel exists same frequency according to when being transmitted when listening to, when namely there is co-channel interference, suspend and transmit data to be launched, until listening to when preselected transport channel does not have co-channel interference, again data to be launched are transmitted, ensure that the reliability that data to be launched are transmitted.
Based on above-mentioned design, finding after multiple authentication, adopting the low rate of 244.14bps, the bandwidth of 125khz is when carrying out the data transmission of gas meter, and reliability is higher, is tested can penetrate 34 floor layers under this condition and effectively carry out data transmission up and down by reality.Thus, in the embodiment of the present invention, it is preferable that launch with the speed of 244.14bps after described data to be launched are spread to the bandwidth of 125khz.
On this basis, it is preferred to use 4/6 Forward Error Correction encodes, the valid data of the spreading gain of employing 12, the synchronous head of 8 bytes, 40 bytes are wirelessly transferred.
On the basis of the above, the embodiment of the present invention additionally provides a kind of wireless data transmission device 903, is applied to gas meter, as it is shown in fig. 7, described wireless data transmission device 903 includes: monitoring means 701, processing unit 702, lookup unit 703 and transmitter unit 704.
Wherein, described monitoring means 701 is used for monitoring in described gas meter whether there are data to be launched.Description about described monitoring means 701 specifically can be joined the description of step S101 in Fig. 1.That is, described step S101 can be performed by described monitoring means 701.
Described processing unit 702 is for when the monitoring of described monitoring means 701 draws and there are data to be launched in described gas meter, carrying out spread processing to described data to be launched.Description about described processing unit 702 specifically can be joined the description of step S102 in Fig. 1.That is, described step S102 can be performed by described processing unit 702.
Described lookup unit 703 for finding out the transfer rate corresponding with the frequency spectrum of the data described to be launched after spread spectrum from the data base prestored.Description about described lookup unit 703 specifically can be joined the description of step S103 in Fig. 1.That is, described step S103 can be performed by described lookup unit 703.
Described transmitter unit 704 is for launching the data described to be launched after spread spectrum by described transfer rate.Description about described transmitter unit 704 specifically can be joined the description of step S104 in Fig. 1.That is, described step S104 can be performed by described transmitter unit 704.
As shown in Figure 8, further, described wireless data transmission device 903 also includes: code element increases unit 705.Described code element increases unit 705 for increasing the redundancy supervision code element for realizing error correction, error detection by preset rules after the information sequence of described data to be launched.
Correspondingly, described transmitter unit 704 specifically for by described transfer rate by spread spectrum and increase described redundancy supervision code element after data described to be launched launch.
As it is shown in figure 9, described transmitter unit 704 includes: multichannel is launched subelement 801, monitoring the process subelement 802 and controls subelement 803.
Wherein, described multichannel launches subelement 801 for using two and two or more channel to synchronize the data described to be launched after spread spectrum are launched by described transfer rate.Described monitoring the process subelement 802 is for monitoring the transmission process of each channel in said two and two or more channel.Described control subelement 803 for when monitoring show that in said two and two or more channel, arbitrary channel completes the transmission of the data described to be launched after spread spectrum, sending the control instruction stopping transmission to all the other channels.
Compared with prior art, the radio data transmission method provided in the embodiment of the present invention and device, carry out the data to be launched in gas meter being transmitted by the speed corresponding with the frequency spectrum after spread spectrum again after spreading gain (also known as processing gain) processes, pass through spreading gain, weaken the requirement to signal to noise ratio in being wirelessly transferred, improve capacity of resisting disturbance when data are transmitted in gas meter and frequency band reusability, add the distance of data transmission in gas meter, the community that, floor many at floor is complicated remains able to be effectively taking place wireless data transmission.
On the basis of the above, the embodiment of the present invention additionally provides a kind of gas meter including above-mentioned wireless data transmission device 903, and as shown in Figure 10, described gas meter includes tolerance detecting device 904, processes device 905 and communicator 906.
Wherein, described tolerance detecting device 904 is used for detecting tolerance.
Described process device 905 carries out process for the tolerance that the detection of described tolerance detecting device 904 is drawn and obtains data to be launched.
The wireless data transmission device 903 provided in the embodiment of the present invention can be applicable in applied environment as shown in Figure 10.As shown in Figure 10, wireless data transmission device 903 is stored in memorizer 901, processor 902 is by running the software program and module being stored in memorizer 901, wireless data transmission device 903 in the embodiment of the present invention, thus performing the application of various function and data process, namely realize the radio data transmission method in the embodiment of the present invention.Memorizer 901 can include high speed random access memory 901, may also include nonvolatile memory 901, such as one or more magnetic storage device, flash memory or other non-volatile solid state memories 901.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.It should also be noted that similar label and letter below figure represent similar terms, therefore, once a certain Xiang Yi accompanying drawing is defined, then it need not be carried out definition further and explain in accompanying drawing subsequently.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (10)
1. a radio data transmission method, is applied to gas meter, it is characterised in that described method includes:
Monitor and whether described gas meter exists data to be launched；
When described gas meter exists data to be launched, described data to be launched are carried out spread processing；
The transfer rate corresponding with the frequency spectrum of the data described to be launched after spread spectrum is found out from the data base prestored；
By described transfer rate, the data described to be launched after spread spectrum are launched.
2. radio data transmission method according to claim 1, it is characterised in that described method also includes:
The redundancy supervision code element for realizing error correction, error detection is increased by preset rules after the information sequence of described data to be launched；
Described by described transfer rate, the step that the data described to be launched after spread spectrum carry out launching is included:
By described transfer rate by spread spectrum and increase described redundancy supervision code element after data described to be launched launch.
3. radio data transmission method according to claim 1, it is characterised in that described by described transfer rate, the step that the data described to be launched after spread spectrum carry out launching is included:
Two and two or more channel is used to synchronize the data described to be launched after spread spectrum are launched by described transfer rate；
The transmission process of each channel in monitoring said two and two or more channel；
When monitoring show that in said two and two or more channel, arbitrary channel completes the transmission of the data described to be launched after spread spectrum, send the control instruction stopping transmission to all the other channels.
4. radio data transmission method according to claim 1, it is characterised in that described by described transfer rate, the step that the data described to be launched after spread spectrum carry out launching is included:
The multiple channels prestored are monitored, selecting at least one from the plurality of channel and be absent from same frequency according to transmission channel as described data to be launched of the channel that is being transmitted, described same frequency is according to for using same class frequency to carry out the data launched with described data to be launched；
By described transfer rate, the data described to be launched after spread spectrum are launched by described transmission channel.
5. radio data transmission method according to claim 4, it is characterised in that described select at least one from the plurality of channel and be absent from same frequency and include as the step of the transmission channel of described data to be launched according to the channel that is being transmitted:
Select a channel as the preselected transport channel of described data to be launched from the multiple channels prestored；
Judge whether described preselected transport channel exists same frequency according to being transmitted；
When described preselected transport channel existing same frequency according to when being transmitted, from the multiple channels prestored, reselect another channel preselected transport channel as described data to be launched；
Return execution is described judges whether there is same frequency in described preselected transport channel according to being transmitted and when there is same frequency in described preselected transport channel according to when being transmitted, another channel step as the preselected transport channel of described data to be launched is reselected from the multiple channels prestored, until judging to draw and described preselected transport channel being absent from same frequency according to being transmitted, there will be no same frequency according to the described preselected transport channel being the transmitted transmission channel as described data to be transmitted.
6. radio data transmission method according to claim 4, it is characterised in that described select at least one from the plurality of channel and be absent from same frequency and include as the step of the transmission channel of described data to be launched according to the channel that is being transmitted:
Select a channel as the preselected transport channel of described data to be launched from the multiple channels prestored；
Judge whether described preselected transport channel exists same frequency according to being transmitted；
When described preselected transport channel existing same frequency according to when being transmitted, same frequency data-transfer process in described preselected transport channel is monitored, after same frequency wireless data transmission in described preselected transport channel completes, using the described preselected transport channel transmission channel as described data to be transmitted.
7. the radio data transmission method according to claim 1～6 any one, it is characterised in that described method includes:
Launch with the speed of 244.14bps after described data to be launched are spread to the bandwidth of 125khz.
8. a wireless data transmission device, is applied to gas meter, it is characterised in that described wireless data transmission device includes:
Monitoring means, is used for monitoring in described gas meter whether there are data to be launched；
Processing unit, for when the monitoring of described monitoring means draws and there are data to be launched in described gas meter, carrying out spread processing to described data to be launched；
Search unit, for finding out the transfer rate corresponding with the frequency spectrum of the data described to be launched after spread spectrum from the data base prestored；
Transmitter unit, for launching the data described to be launched after spread spectrum by described transfer rate.
9. wireless data transmission device according to claim 8, it is characterised in that also include:
Code element increases unit, for increasing the redundancy supervision code element for realizing error correction, error detection by preset rules after the information sequence of described data to be launched；
Described transmitter unit, specifically for by described transfer rate by spread spectrum and increase described redundancy supervision code element after data described to be launched launch.
10. wireless data transmission device according to claim 8, it is characterised in that described transmitter unit includes:
Multichannel launches subelement, for using two and two or more channel to synchronize the data described to be launched after spread spectrum are launched by described transfer rate；
Monitoring the process subelement, for monitoring the transmission process of each channel in said two and two or more channel；
Control subelement, for when monitoring show that in said two and two or more channel, arbitrary channel completes the transmission of the data described to be launched after spread spectrum, sending the control instruction stopping transmission to all the other channels.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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