CN105337697B - A kind of electric power wireless communications method, apparatus and system suitable for distribution automation - Google Patents
A kind of electric power wireless communications method, apparatus and system suitable for distribution automation Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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Abstract
This application discloses a kind of electric power wireless communications methods suitable for distribution automation, base station can select different channel coding methods, rate-matched mode and modulation system according to the bit error rate situation of present channel, and the scheduling request comprising the channel coding method, rate-matched mode and modulation system is sent to terminal in descending time slot；Terminal is handled the data of base station requests using the selected channel coding method in base station, rate-matched mode and modulation system according to the scheduling request, and sends the data to base station in ascending time slot；By this method channel can maximumlly be utilized, improve the efficiency of transmission of data using channel coding method, rate-matched mode and the modulation system for being most suitable for present channel bit error rate situation.
Description
Technical field
The present invention relates to wireless communication field, specially a kind of electric power wireless communications method suitable for distribution automation,
Apparatus and system.
Background technique
As Radio Spectrum Resource day is becoming tight, there are other a large amount of wireless communications in the public frequency band without authorization
Number, if electric power wireless communication is also carried out wireless communication using these frequency ranges, communication quality will necessarily be by large effect.It presses
According to the division of the National Radio committee, it includes 40 frequency points discrete in 223~235MHz that electric power, which wirelessly communicates dedicated frequency range,
Each frequency point possesses 25KHz bandwidth.Electric power wireless communication is carried out using these frequency ranges, can be avoided other a large amount of public radios
The interference of signal guarantees the reliability of electric power wireless communication.
In the prior art, there is more mature data radio station technology in 230MHz frequency range, but its modulation system for using
It is single, mostly FSK (Frequency-Shift Keying, frequency shift keying), GFSK (Gauss Frequency-Shift
Keying, GFSK Gaussian Frequency Shift Keying) etc. low-order-modulateds mode, frequency spectrum service efficiency is low, and message transmission rate is fixed, and leads to data
Efficiency of transmission it is lower.
Summary of the invention
In view of this, overcoming existing the present invention provides a kind of electric power wireless communications method suitable for distribution automation
Frequency spectrum service efficiency is low in technology, and the fixed problem of message transmission rate achievees the purpose that improve data transfer efficiency.
To achieve the above object, it provides the following technical solutions:
A kind of electric power wireless communications method suitable for distribution automation, is arranged each frame in Data Transport Protocol in advance
Frame structure comprising three continuous descending time slots and seven continuous ascending time slots；Described three continuous descending time slot distribution
It is used to base station, described seven continuous ascending time slots distribute to terminal use；Wherein, which comprises
Base station selects channel corresponding with the bit error rate situation of present channel to compile according to the bit error rate situation of present channel
Code mode, rate-matched mode and modulation system, and the descending time slot to terminal send comprising the channel coding method,
The scheduling request of rate-matched mode and modulation system；
Base station receives the data that terminal is sent in ascending time slot；The data are the number of terminals requested in the scheduling request
According to；The treatment process of the data are as follows: the data of base station requests are subjected to channel coding, rate-matched and modulation, after making processing
Data fit slot length.
Preferably, described seven continuous ascending time slots distribute to terminal use, comprising:
When the terminal quantity in cordless communication network is seven, one ascending time slot of each terminal distribution.
Preferably, described seven continuous ascending time slots distribute to terminal use, comprising:
It is first one ascending time slot of each terminal distribution, so when the terminal quantity in cordless communication network is less than seven
Unappropriated ascending time slot in a frame frame structure is randomly assigned to terminal afterwards.
Preferably, described seven continuous ascending time slots distribute to terminal use, comprising:
When the terminal quantity in cordless communication network is greater than seven, ascending time slot is distributed to respectively by the way of poll
A terminal.
Preferably, the slot length includes:
Data length and time span.
Preferably, the data length is 200 symbols, wherein successively including the information data of 83 symbols of data length
Symbol, the training sequence symbols of 32 symbols of data length, the information data symbols of 83 symbols of data length, data length 2
The slot time symbol of a symbol.
Preferably, the time span is 10ms, wherein successively include the information data symbols of time span 4.15ms, when
Between length 1.6ms training sequence symbols, the information data symbols of time span 4.15ms, between the time slot of time span 0.1ms
Every symbol.
Preferably, the channel coding method, comprising:
The channel coding method is encoded using the tail biting bit convolution of 1/2 or 1/3 rate.
Preferably, the modulation system, comprising:
The modulation system uses binary phase shift keying BPSK, quadrature phase shift keying QPSK or quadrature amplitude modulation
16QAM。
It preferably, before the data to the base station requests are handled, further include generating cyclic redundancy check.
A kind of base station, it includes three continuous descending time slots and seven companies that each frame is arranged in Data Transport Protocol in advance
The frame structure of continuous ascending time slot；Described three continuous descending time slots distribute to base station use, seven continuous uplinks
Time slot allocation is used to terminal；Wherein, the base station includes:
Scheduling request transmission unit, for the bit error rate feelings according to the bit error rate situation of present channel selection and present channel
The corresponding channel coding method of condition, rate-matched mode and modulation system, and include to terminal transmission in the descending time slot
The scheduling request of the channel coding method, rate-matched mode and modulation system；
Terminal data receiving unit, the data sent for receiving terminal in ascending time slot；The data are the scheduling
The terminal data requested in request；The treatment process of the data are as follows: the data of base station requests are subjected to channel coding, rate
Match and modulates, the data fit slot length that makes that treated.
A kind of electric power wireless communications method suitable for distribution automation, is arranged each frame in Data Transport Protocol in advance
Frame structure comprising three continuous descending time slots and seven continuous ascending time slots；Described three continuous descending time slot distribution
It is used to base station, described seven continuous ascending time slots distribute to terminal use；Wherein, which comprises
Terminal receives the scheduling request that base station is sent in the descending time slot, and the scheduling request includes base station according to current
The bit error rate situation of channel selects different channel coding methods, rate-matched mode and modulation system；
Terminal uses the selected channel coding method in base station, rate-matched mode and modulation methods according to the scheduling request
Formula handles the data of base station requests, and treated that data are sent to base by described in the corresponding ascending time slot of terminal
It stands；
The data to base station requests are handled, comprising: the data of base station requests are carried out channel coding, rate
Match and modulates, the data fit slot length that makes that treated.
A kind of terminal, it includes three continuous descending time slots and seven companies that each frame is arranged in Data Transport Protocol in advance
The frame structure of continuous ascending time slot；Described three continuous descending time slots distribute to base station use, seven continuous uplinks
Time slot allocation is used to terminal；Wherein, the terminal includes:
Scheduling request receiving unit, the scheduling request sent for receiving base station in the descending time slot, the scheduling are asked
It asks and different channel coding methods, rate-matched mode and modulation methods is selected according to the bit error rate situation of present channel comprising base station
Formula；
Terminal data transmission unit, for using the selected channel coding method in base station, speed according to the scheduling request
Rate matching way and modulation system handle the data of base station requests, and in the corresponding ascending time slot of terminal by the processing
Data afterwards are sent to base station；
The data to base station requests are handled, comprising: the data of base station requests are carried out channel coding, rate
Match and modulates, the data fit slot length that makes that treated.
A kind of electric power wireless communication system suitable for distribution automation, comprising:
Base station as claimed in claim 11 and terminal as claimed in claim 13.
A kind of electric power wireless communications method suitable for distribution automation is present embodiments provided, base station can be according to current
The bit error rate situation of channel selects different channel coding methods, rate-matched mode and modulation system, and descending time slot to
Terminal sends the scheduling request comprising the channel coding method, rate-matched mode and modulation system；Terminal is according to the tune
Degree request is carried out using the data of the selected channel coding method in base station, rate-matched mode and modulation system to base station requests
Processing, and base station is sent the data in ascending time slot；It can be using the most suitable present channel bit error rate by this method
Channel coding method, rate-matched mode and the modulation system of situation, are maximumlly utilized channel, improve the transmission of data
Efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow diagram of the electric power wireless communications method suitable for distribution automation provided by the invention；
Fig. 2 is a kind of frame structure signal of electric power wireless communications method suitable for distribution automation provided by the invention
Figure；
Fig. 3 is a kind of structure of time slot signal of electric power wireless communications method suitable for distribution automation provided by the invention
Figure；
Fig. 4 is a kind of coding of the electric power wireless communications method suitable for distribution automation provided by the invention, rate
The specific implementation flow chart matched and modulated；
Fig. 5 is a kind of network structure signal of electric power wireless communications method suitable for distribution automation provided by the invention
Figure；
Fig. 6 is a kind of another process signal of electric power wireless communications method suitable for distribution automation provided by the invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of electric power wireless communications methods suitable for distribution automation, overcome the prior art
Middle frequency spectrum service efficiency is low, and the fixed problem of message transmission rate achievees the purpose that improve data transfer efficiency.
As shown in Figure 1, 2, the embodiment of the invention provides a kind of electric power wireless communications method suitable for distribution automation,
The frame that each frame includes three continuous descending time slots and seven continuous ascending time slots is set in Data Transport Protocol in advance
Structure；Described three continuous descending time slots distribute to base station use, and described seven continuous ascending time slots, which distribute to terminal, to be made
With；The method are as follows:
S101. base station selects letter corresponding with the bit error rate situation of present channel according to the bit error rate situation of present channel
Road coding mode, rate-matched mode and modulation system, and sending in the descending time slot to terminal includes the channel coding
The scheduling request of mode, rate-matched mode and modulation system；
S102. base station receives the data that terminal is sent in ascending time slot.
The data are the terminal data requested in the scheduling request；The treatment process of the data are as follows: ask base station
The data asked carry out channel coding, rate-matched and modulation, the data fit slot length that makes that treated.
A kind of electric power wireless communications method suitable for distribution automation is present embodiments provided, base station can be according to current
The bit error rate situation of channel selects different channel coding methods, rate-matched mode and modulation system, and descending time slot to
Terminal sends the scheduling request comprising the channel coding method, rate-matched mode and modulation system；Terminal is according to the tune
Degree request is carried out using the data of the selected channel coding method in base station, rate-matched mode and modulation system to base station requests
Processing, and base station is sent the data in ascending time slot；It can be using most suitable present channel without code rate by this method
Channel coding method, rate-matched mode and the modulation system of situation, are maximumlly utilized channel, improve the transmission of data
Efficiency.
In above-mentioned communication process, the base station selects the error code with present channel according to the bit error rate situation of present channel
The corresponding channel coding method of rate situation, rate-matched mode and modulation system, specifically, presetting a bit error rate threshold
Value, such as 10-5 keep the communication mode (including channel coding method, speed when the bit error rate for receiving data is less than the threshold value
Rate matching way and modulation system, similarly hereinafter) constant；When receive data the bit error rate be much smaller than the threshold value when namely present channel
Condition preferably (interference is small), then use more efficient communication mode, with improve data transfer efficiency；When the bit error rate for receiving data
When greater than the threshold value (namely error in data quantity is greater than the threshold value being arranged), then more inefficient communication mode is used, to guarantee number
According to the correctness of transmission.
The selection of communication mode is a dynamic process, may be changed over time, by the time
Channel condition (mainly signal transmits the interference size being subject to) changes and changes in section.If finding to miss in sometime base station
Code rate is more than threshold value, is just adjusted to communication mode, for example, by using the lesser communication mode of Deta bearer length, then it is not all right
Again with smaller, until meeting bit error rate requirement.Similarly, if finding bit error rate very little in sometime base station, number is just used
According to the biggish communication mode of loaded length, and can be according to bit error rate situation always to big adjustment, until the bit error rate is more than threshold value.
As shown in figure 3, the slot length includes: disclosed in above-described embodiment in electric power wireless communications method
Data length and time span.
Wherein, the data length is 200 symbols, wherein successively the information data comprising 83 symbols of data length accords with
Number, the training sequence symbols of 32 symbols of data length, the information data symbols of 83 symbols of data length, data length 2
The slot time symbol of symbol.
The time span is 10ms, wherein successively comprising wherein successively the information data comprising time span 4.15ms accords with
Number, the training sequence symbols of time span 1.6ms, the information data symbols of time span 4.15ms, time span 0.1ms when
Gap space character.
As it can be seen that each symbol duration is 10ms/200=0.05ms.
As shown in the above, the time slot includes three classes symbol: information data symbols, training sequence symbols, time slot
Space character.
Wherein, information data symbols are for carrying the valid data transmitted；Training sequence symbols are for estimating
Frequency departure between amendment base station and terminal；Slot time symbol is used to prevent from interfering between the time slot between two time slots.
Optionally, in another embodiment of the invention, the channel coding method, comprising:
The channel coding method is encoded using the tail biting bit convolution of 1/2 or 1/3 rate.
It include input shift register, modular two addition device, output using convolution coder used in above-mentioned coding mode
Shift register.
The convolution coder is specially (2,1,8), (3,1,8) convolution coder, respectively corresponds 1/2,1/3 rate convolutional
Coding.
Its principle are as follows: when inputting the character that length is 8bit in input displacement register, modular two addition device is by the character
It is divided into 2 (3) groups, every group of character is a part of character selected from 8bit character, then at Output Shift Register
Output length is the character of 2bit (3bit).
Wherein, the character that the modular two addition device of different groups takes out different location from input shift register carries out mould two
Add, and calculated result is stored in corresponding Output Shift Register.
Anti-interference ability in data transmission procedure, the accuracy of improve data transfer can be improved using channel coding.
Optionally, the modulation system, comprising:
The modulation system uses binary phase shift keying BPSK, quadrature phase shift keying QPSK or quadrature amplitude modulation
16QAM。
Above-mentioned coding mode is high-order coding mode, under same bandwidth, the FSK that uses in the prior art
(Frequency-Shift Keying, frequency shift keying), GFSK (Gauss Frequency-Shift Keying, Gaussian frequency shift
Keying) etc. low-order-modulateds mode, a symbol can only represent the data of a unit, frequency spectrum service efficiency is low, and uses high
Rank modulation system can carry the data of 2 or 4 units with a symbol, and data volume is improved, and then use frequency spectrum
Efficiency improves.
Optionally, the rate-matched mode, comprising:
The rate-matched mode is adjusted according to the bit error rate situation of present channel.
The rate-matched is also known as punched, its purpose is to make data meet the requirement of slot length, when only meeting
After the requirement of gap length, the transmission work of data just can be carried out.In conjunction with different Deta bearer length, channel coding method and tune
Mode processed needs to carry out data the punching of different number.It is as shown in table 1 to punch its corresponding relationship of quantity.
1 different bearer data length corresponding data of table coding and modulation system
In table 1, third arranges " Deta bearer length ", and numerical value is bigger, shows that the data transmitted in a time slot are more.Such as
Fruit needs efficient communication mode, then big with numerical value；It is if necessary to correctly transmission, then small with numerical value.
Specifically, the process of the rate-matched are as follows: by taking 1/7 punching as an example, as shown in connection with fig. 4, from prime convolutional encoding
Process 110 receives continuous seven data, only exports the first six data to rear class modulation process 130, abandons the 7th data.?
That is continuous six data are inputted from prime convolutional encoding process 110, after being output to as former state in rate-matched process 120
The modulation process 130 in face, and next 7th data abandon and are not sent into subsequent modulation process 130, the eight to ten three
Data export as former state, and the 14th data discarding does not export, and is reprocessed with this, until completing all data in a time slot
Processing.Base station can recover the data of discarding by identical hole knockout, keep data complete.
Wherein, 0/1 expression is not punched and (is not abandoned), and the data received are all output to rear class.
The rate-matched mode is adjusted according to the bit error rate situation of present channel, specifically:
Currently employed rate-matched mode is 1/4 punching, and base station finds that the bit error rate is higher in data transmission procedure, i.e.,
Adjusting rate-matched mode is 1/5 punching, continues data transmission, and so on.
Optionally, in another embodiment of the invention, it before the data to the base station requests are handled, also wraps
It includes:
Generate cyclic redundancy check.
Optionally, the cyclic redundancy check is generated by the way of 12bit verification.
The cyclic redundancy check is used to verify the correctness of data.
A kind of electric power wireless communications method suitable for distribution automation is present embodiments provided, base station can be according to current
The bit error rate situation of channel selects different channel coding methods, rate-matched mode and modulation system, and descending time slot to
Terminal sends the scheduling request comprising the channel coding method, rate-matched mode and modulation system；Terminal is according to the tune
Degree request is carried out using the data of the selected channel coding method in base station, rate-matched mode and modulation system to base station requests
Processing, and base station is sent the data in ascending time slot；It can be using most suitable present channel without code rate by this method
Channel coding method, rate-matched mode and the modulation system of situation, are maximumlly utilized channel, improve the transmission of data
Efficiency.
Optionally, in another embodiment of the invention, described seven continuous ascending time slots distribute to terminal use, packet
It includes:
As shown in figure 5, when the terminal quantity in cordless communication network is seven, when each one uplink of terminal distribution
Gap；
It is first one ascending time slot of each terminal distribution, so when the terminal quantity in cordless communication network is less than seven
Unappropriated ascending time slot in a frame frame structure is randomly assigned to terminal afterwards；
When the terminal quantity in cordless communication network is greater than seven, ascending time slot is distributed to respectively by the way of poll
A terminal.
Specifically, the distribution of time slot is responsible for by base station, information is distributed to terminal sending time slots in three descending time slots in base station,
Under normal circumstances, the corresponding ascending time slot of a terminal.Namely when the terminal in cordless communication network in above content
When quantity is seven, one ascending time slot of each terminal distribution；
If there is extra free timeslot, that is to say, that when the terminal quantity in cordless communication network is less than seven, then
To extra vacant ascending time slot, there are two types of processing modes for base station: 1, requesting the data volume of some terminal larger, need multiple
Time slot could be completed to transmit, and extra free timeslots can be distributed to the terminal at this time and used (on condition that not influencing to divide in advance
The time slot of other terminals of dispensing)；2, it is doed nothing in free timeslots.No matter using any of above two method, all it is
In three time slots of base station down, time slot allocation information is sent to each terminal by base station, can allow terminal know have it is extra
Free timeslots distribute to oneself.Still the corresponding time slot of terminal of following the prescribed order.
A kind of electric power wireless communications method suitable for distribution automation is present embodiments provided, base station can be according to current
The bit error rate situation of channel selects different channel coding methods, rate-matched mode and modulation system, and descending time slot to
Terminal sends the scheduling request comprising the channel coding method, rate-matched mode and modulation system；Terminal is according to the tune
Degree request is carried out using the data of the selected channel coding method in base station, rate-matched mode and modulation system to base station requests
Processing, and base station is sent the data in ascending time slot；It can be using most suitable present channel without code rate by this method
Channel coding method, rate-matched mode and the modulation system of situation, are maximumlly utilized channel, improve the transmission of data
Efficiency.It is also adjusted by the distribution to ascending time slot, meets electric power wireless base station/terminal group-net communication in a certain range,
It realizes light-weighted demand, reduces the requirement to electric power terminal processing capacity.
As shown in fig. 6, the embodiment provides a kind of electric power wireless communications method suitable for distribution automation,
The frame that each frame includes three continuous descending time slots and seven continuous ascending time slots is set in Data Transport Protocol in advance
Structure；Described three continuous descending time slots distribute to base station use, and described seven continuous ascending time slots, which distribute to terminal, to be made
With；The method are as follows:
S201. terminal receives the scheduling request that base station is sent in the descending time slot；
The scheduling request selects different channel coding methods, speed according to the bit error rate situation of present channel comprising base station
Rate matching way and modulation system；
S202. terminal according to the scheduling request using the selected channel coding method in base station, rate-matched mode and
Modulation system handles the data of base station requests, and the corresponding ascending time slot of terminal will described treated that data are sent
To base station.
The data to base station requests are handled, comprising: the data of base station requests are carried out channel coding, rate
Match and modulates, the data fit slot length that makes that treated.
A kind of electric power wireless communications method suitable for distribution automation is present embodiments provided, base station can be according to current
The bit error rate situation of channel selects different channel coding methods, rate-matched mode and modulation system, and descending time slot to
Terminal sends the scheduling request comprising the channel coding method, rate-matched mode and modulation system；Terminal is according to the tune
Degree request is carried out using the data of the selected channel coding method in base station, rate-matched mode and modulation system to base station requests
Processing, and base station is sent the data in ascending time slot；It can be using most suitable present channel wooden horse rate by this method
Channel coding method, rate-matched mode and the modulation system of situation, are maximumlly utilized channel, improve the transmission of data
Efficiency.
The embodiment provides a kind of electric power wireless communication system suitable for distribution automation, the system packets
It includes:
A kind of base station, it includes three continuous descending time slots and seven companies that each frame is arranged in Data Transport Protocol in advance
The frame structure of continuous ascending time slot；Described three continuous descending time slots distribute to base station use, seven continuous uplinks
Time slot allocation is used to terminal；Wherein, the base station includes:
Scheduling request transmission unit, for the bit error rate feelings according to the bit error rate situation of present channel selection and present channel
The corresponding channel coding method of condition, rate-matched mode and modulation system, and include to terminal transmission in the descending time slot
The scheduling request of the channel coding method, rate-matched mode and modulation system；
A kind of terminal, which is characterized in that it includes three continuous downlinks that each frame is arranged in Data Transport Protocol in advance
The frame structure of time slot and seven continuous ascending time slots；Described three continuous descending time slots are distributed to base station and are used, and described seven
A continuous ascending time slot distributes to terminal use；Wherein, the terminal includes:
Scheduling request receiving unit, the scheduling request sent for receiving base station in the descending time slot, the scheduling are asked
It asks and different channel coding methods, rate-matched mode and modulation methods is selected according to the bit error rate situation of present channel comprising base station
Formula；
Terminal data transmission unit, for using the selected channel coding method in base station, speed according to the scheduling request
Rate matching way and modulation system handle the data of base station requests, and in the corresponding ascending time slot of terminal by the processing
Data afterwards are sent to base station；
The data to base station requests are handled, comprising: the data of base station requests are carried out channel coding, rate
Match and modulates, the data fit slot length that makes that treated.
Data Transport Protocol in this system is using time division multiplexing (TDM, Time Division Multiplexing) frame
Structure, each frame of the frame structure include the frame structure of three continuous descending time slots and seven continuous ascending time slots；Institute
It states three continuous descending time slots and distributes to base station use, described seven continuous ascending time slots distribute to terminal use；Same
Base station/terminal in one wireless network sends data and is controlled by synchronised clock, and base station/terminal carries out in the time slot respectively distributed
Data are sent, and are presumptuously being listened to or data receiver with only can be carried out in time slot.
A kind of electric power wireless communication system suitable for distribution automation, including base station and terminal are present embodiments provided,
The base station can select different channel coding methods, rate-matched mode and modulation according to the bit error rate situation of present channel
Mode, and the scheduling comprising the channel coding method, rate-matched mode and modulation system is sent to terminal in descending time slot
Request；Terminal uses the selected channel coding method in base station, rate-matched mode and modulation system according to the scheduling request
The data of base station requests are handled, and send the data to base station in ascending time slot；It can be used by this method
It is most suitable for channel coding method, rate-matched mode and the modulation system of present channel wooden horse rate situation, is maximumlly utilized
Channel improves the efficiency of transmission of data.It is also adjusted by the distribution to ascending time slot, it is wireless to meet electric power in a certain range
The group-net communication of base station/terminal realizes light-weighted demand, reduces the requirement to electric power terminal processing capacity.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection scope of the application.
Claims (11)
1. a kind of electric power wireless communications method suitable for distribution automation, which is characterized in that in advance in Data Transport Protocol
The frame structure that each frame includes three continuous descending time slots and seven continuous ascending time slots is set；Under described three continuous
Row time slot allocation is used to base station, and described seven continuous ascending time slots distribute to terminal use；Wherein, which comprises
Base station selects channel coding side corresponding with the bit error rate situation of present channel according to the bit error rate situation of present channel
Formula, rate-matched mode and modulation system, and sending in the descending time slot to terminal includes the channel coding method, rate
The scheduling request of matching way and modulation system；
Base station receives the data that terminal is sent in ascending time slot；The data are the terminal data requested in the scheduling request；
The treatment process of the data are as follows: the data of base station requests are subjected to channel coding, rate-matched and modulation, make treated to count
According to slot length is met, the slot length includes: data length and time span；The data length is 200 symbols,
In successively include 83 symbols of data length information data symbols, the training sequence symbols of 32 symbols of data length, data
The information data symbols of 83 symbols of length, the slot time symbol of 2 symbols of data length；The time span is 10ms,
It wherein successively include the information data symbols of time span 4.15ms, the training sequence symbols of time span 1.6ms, time span
The information data symbols of 4.15ms, the slot time symbol of time span 0.1ms；
Wherein, time slot includes three classes symbol: information data symbols, training sequence symbols and slot time symbol；
The information data symbols are for carrying the valid data transmitted；
The training sequence symbols are for estimating and correcting the frequency departure between base station and terminal；
The slot time symbol is used to prevent from interfering between the time slot between two time slots.
2. electric power wireless communications method according to claim 1, which is characterized in that described seven continuous ascending time slots point
Dispensing terminal uses, comprising:
When the terminal quantity in cordless communication network is seven, one ascending time slot of each terminal distribution.
3. electric power wireless communications method according to claim 1, which is characterized in that described seven continuous ascending time slots point
Dispensing terminal uses, comprising:
It is first one ascending time slot of each terminal distribution when the terminal quantity in cordless communication network is less than seven, then will
Unappropriated ascending time slot is randomly assigned to terminal in one frame frame structure.
4. electric power wireless communications method according to claim 1, which is characterized in that described seven continuous ascending time slots point
Dispensing terminal uses, comprising:
When the terminal quantity in cordless communication network is greater than seven, ascending time slot is distributed into each end by the way of poll
End.
5. electric power wireless communications method according to claim 1, which is characterized in that the channel coding method, comprising:
The channel coding method is encoded using the tail biting bit convolution of 1/2 or 1/3 rate.
6. electric power wireless communications method according to claim 1, which is characterized in that the modulation system, comprising:
The modulation system uses binary phase shift keying BPSK, quadrature phase shift keying QPSK or quadrature amplitude modulation 16QAM.
7. electric power wireless communications method according to claim 1, which is characterized in that the data to the base station requests into
Before row processing, further include, generates cyclic redundancy check.
8. a kind of base station, which is characterized in that when each frame is arranged in Data Transport Protocol in advance comprising three continuous downlinks
The frame structure of gap and seven continuous ascending time slots；Described three continuous descending time slots are distributed to base station and are used, and described seven
Continuous ascending time slot distributes to terminal use；Wherein, the base station includes:
Scheduling request transmission unit, for the bit error rate situation phase according to the bit error rate situation of present channel selection and present channel
Corresponding channel coding method, rate-matched mode and modulation system, and sent to terminal comprising described in the descending time slot
The scheduling request of channel coding method, rate-matched mode and modulation system；
Terminal data receiving unit, the data sent for receiving terminal in ascending time slot；The data are the scheduling request
The terminal data of middle request；The treatment process of the data are as follows: by the data of base station requests carry out channel coding, rate-matched and
Modulation, the data fit slot length that makes that treated, the slot length includes: data length and time span；The data
Length is 200 symbols, wherein successively include the information data symbols of 83 symbols of data length, 32 symbols of data length
Training sequence symbols, the information data symbols of 83 symbols of data length, the slot time symbol of 2 symbols of data length；Institute
Stating time span is 10ms, wherein successively including the information data symbols of time span 4.15ms, the training of time span 1.6ms
Sequence symbol, the information data symbols of time span 4.15ms, the slot time symbol of time span 0.1ms；
Wherein, time slot includes three classes symbol: information data symbols, training sequence symbols and slot time symbol；
The information data symbols are for carrying the valid data transmitted；
The training sequence symbols are for estimating and correcting the frequency departure between base station and terminal；
The slot time symbol is used to prevent from interfering between the time slot between two time slots.
9. a kind of electric power wireless communications method suitable for distribution automation, which is characterized in that in advance in Data Transport Protocol
The frame structure that each frame includes three continuous descending time slots and seven continuous ascending time slots is set；Under described three continuous
Row time slot allocation is used to base station, and described seven continuous ascending time slots distribute to terminal use；Wherein, which comprises
Terminal receives the scheduling request that base station is sent in the descending time slot, and the scheduling request includes base station according to present channel
Bit error rate situation select different channel coding methods, rate-matched mode and modulation system；
Terminal uses the selected channel coding method in base station, rate-matched mode and modulation system pair according to the scheduling request
The data of base station requests are handled, and treated that data are sent to base station by described in the corresponding ascending time slot of terminal；
The data to base station requests are handled, comprising: by the data of base station requests carry out channel coding, rate-matched and
Modulation, the data fit slot length that makes that treated, the slot length includes: data length and time span；The data
Length is 200 symbols, wherein successively include the information data symbols of 83 symbols of data length, 32 symbols of data length
Training sequence symbols, the information data symbols of 83 symbols of data length, the slot time symbol of 2 symbols of data length；Institute
Stating time span is 10ms, wherein successively including the information data symbols of time span 4.15ms, the training of time span 1.6ms
Sequence symbol, the information data symbols of time span 4.15ms, the slot time symbol of time span 0.1ms；
Wherein, time slot includes three classes symbol: information data symbols, training sequence symbols and slot time symbol；
The information data symbols are for carrying the valid data transmitted；
The training sequence symbols are for estimating and correcting the frequency departure between base station and terminal；
The slot time symbol is used to prevent from interfering between the time slot between two time slots.
10. a kind of terminal, which is characterized in that when each frame is arranged in Data Transport Protocol in advance comprising three continuous downlinks
The frame structure of gap and seven continuous ascending time slots；Described three continuous descending time slots are distributed to base station and are used, and described seven
Continuous ascending time slot distributes to terminal use；Wherein, the terminal includes:
Scheduling request receiving unit, the scheduling request sent for receiving base station in the descending time slot, the scheduling request packet
Different channel coding methods, rate-matched mode and modulation system are selected according to the bit error rate situation of present channel containing base station；
Terminal data transmission unit, for using the selected channel coding method in base station, rate according to the scheduling request
The data of base station requests are handled with mode and modulation system, and treated by described in the corresponding ascending time slot of terminal
Data are sent to base station；
The data to base station requests are handled, comprising: by the data of base station requests carry out channel coding, rate-matched and
Modulation, the data fit slot length that makes that treated, the slot length includes: data length and time span；The data
Length is 200 symbols, wherein successively include the information data symbols of 83 symbols of data length, 32 symbols of data length
Training sequence symbols, the information data symbols of 83 symbols of data length, the slot time symbol of 2 symbols of data length；Institute
Stating time span is 10ms, wherein successively including the information data symbols of time span 4.15ms, the training of time span 1.6ms
Sequence symbol, the information data symbols of time span 4.15ms, the slot time symbol of time span 0.1ms；
Wherein, time slot includes three classes symbol: information data symbols, training sequence symbols and slot time symbol；
The information data symbols are for carrying the valid data transmitted；
The training sequence symbols are for estimating and correcting the frequency departure between base station and terminal；
The slot time symbol is used to prevent from interfering between the time slot between two time slots.
11. a kind of electric power wireless communication system suitable for distribution automation characterized by comprising
Base station as claimed in claim 8 and terminal as claimed in claim 10.
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