CN105337697A - Electric power wireless communication method, device and system for distribution network automation - Google Patents

Abstract

This application discloses a power wireless communication method suitable for distribution network automation. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and send a message containing A scheduling request for the channel coding method, rate matching method and modulation method; the terminal processes the data requested by the base station using the channel coding method, rate matching method and modulation method selected by the base station according to the scheduling request, and transmits the data requested by the base station in the uplink time slot The data is sent to the base station; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel bit error rate can be adopted, the channel is utilized to the maximum extent, and the data transmission efficiency is improved.

Description

A power wireless communication method, device and system suitable for distribution network automation

technical field

The invention relates to the field of wireless communication, in particular to a power wireless communication method, device and system suitable for distribution network automation.

Background technique

As radio frequency spectrum resources become increasingly scarce, there are a large number of other wireless signals in unlicensed public frequency bands. If power wireless communication also uses these frequency bands for wireless communication, the communication quality will inevitably be greatly affected. According to the division of the National Radio Commission, the dedicated frequency band for electric power wireless communication includes 40 discrete frequency points within 223-235MHz, and each frequency point has a bandwidth of 25KHz. The use of these frequency bands for power wireless communication can avoid the interference of a large number of other public radio signals and ensure the reliability of power wireless communication.

In the prior art, there is relatively mature data transmission radio technology in the 230MHz frequency band, but the modulation method used is single, mostly FSK (Frequency-ShiftKeying, frequency shift keying), GFSK (GaussFrequency-ShiftKeying, Gaussian frequency shift keying ) and other low-order modulation methods, the spectrum utilization efficiency is low, and the data transmission rate is fixed, resulting in low data transmission efficiency.

Contents of the invention

In view of this, the present invention provides a power wireless communication method suitable for distribution network automation, which overcomes the problems of low spectrum utilization efficiency and fixed data transmission rate in the prior art, and achieves the purpose of improving data transmission efficiency.

In order to achieve the above purpose, the following technical solutions are provided:

A power wireless communication method suitable for distribution network automation, in which a frame structure including three consecutive downlink time slots and seven consecutive uplink time slots in each frame is pre-set in the data transmission protocol; the three consecutive downlink time slots The time slot is allocated to the base station, and the seven consecutive uplink time slots are allocated to the terminal; wherein, the method includes:

The base station selects the channel coding mode, rate matching mode and modulation mode corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, and sends a message containing the channel coding mode, rate matching mode and modulation mode to the terminal in the downlink time slot. Scheduling requests for matching modes and modulation modes;

The base station receives the data sent by the terminal in the uplink time slot; the data is the terminal data requested in the scheduling request; the data processing process is: perform channel coding, rate matching and modulation on the data requested by the base station, so that after processing The data fits the slot length.

Preferably, the seven consecutive uplink time slots are allocated to terminals, including:

When there are seven terminals in the wireless communication network, each terminal is assigned an uplink time slot.

Preferably, the seven consecutive uplink time slots are allocated to terminals, including:

When the number of terminals in the wireless communication network is less than seven, an uplink time slot is allocated to each terminal first, and then unallocated uplink time slots in a frame structure are randomly allocated to the terminals.

Preferably, the seven consecutive uplink time slots are allocated to terminals, including:

When the number of terminals in the wireless communication network is greater than seven, the uplink time slot is allocated to each terminal in a polling manner.

Preferably, the time slot length includes:

Data length and time length.

Preferably, the data length is 200 symbols, which sequentially include information data symbols with a data length of 83 symbols, training sequence symbols with a data length of 32 symbols, information data symbols with a data length of 83 symbols, and a data length of 2 symbols The time slot interval symbol.

Preferably, the time length is 10 ms, which sequentially includes information data symbols with a time length of 4.15 ms, training sequence symbols with a time length of 1.6 ms, information data symbols with a time length of 4.15 ms, and slot interval symbols with a time length of 0.1 ms.

Preferably, the channel coding method includes:

The channel coding method adopts 1/2 or 1/3 rate tail-biting bit convolutional coding.

Preferably, the modulation method includes:

The modulation method adopts binary phase shift keying BPSK, quadrature phase shift keying QPSK or quadrature amplitude modulation 16QAM.

Preferably, before processing the data requested by the base station, the method further includes generating a CRC check code.

A base station, which pre-sets a frame structure in which each frame includes three consecutive downlink time slots and seven consecutive uplink time slots in the data transmission protocol; the three continuous downlink time slots are allocated to the base station for use, and the Seven consecutive uplink time slots are allocated to terminals; wherein, the base station includes:

A scheduling request sending unit, configured to select a channel coding method, a rate matching method, and a modulation method corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, and send to the terminal in the downlink time slot including the Scheduling requests for channel coding mode, rate matching mode and modulation mode;

The terminal data receiving unit is used to receive the data sent by the terminal in the uplink time slot; the data is the terminal data requested in the scheduling request; the data processing process is: channel coding and rate matching the data requested by the base station and modulated so that the processed data fits the slot length.

A power wireless communication method suitable for distribution network automation, in which a frame structure including three consecutive downlink time slots and seven consecutive uplink time slots in each frame is pre-set in the data transmission protocol; the three consecutive downlink time slots The time slot is allocated to the base station, and the seven consecutive uplink time slots are allocated to the terminal; wherein, the method includes:

The terminal receives the scheduling request sent by the base station in the downlink time slot, and the scheduling request includes that the base station selects different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel;

The terminal processes the data requested by the base station by using the channel coding method, rate matching method and modulation method selected by the base station according to the scheduling request, and sends the processed data to the base station in the uplink time slot corresponding to the terminal;

The processing of the data requested by the base station includes: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length.

A terminal, in which each frame is pre-set in the data transmission protocol to include three consecutive downlink time slots and seven consecutive uplink time slots; the three consecutive downlink time slots are allocated to the base station for use, and the Seven consecutive uplink time slots are allocated to terminals; wherein, the terminals include:

The scheduling request receiving unit is used to receive the scheduling request sent by the base station in the downlink time slot, and the scheduling request includes that the base station selects different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel;

The terminal data sending unit is used to process the data requested by the base station by using the channel coding method, rate matching method and modulation method selected by the base station according to the scheduling request, and send the processed data to the uplink time slot corresponding to the terminal sent to the base station;

The processing of the data requested by the base station includes: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length.

A power wireless communication system suitable for distribution network automation, including:

The base station according to claim 11 and the terminal according to claim 13.

This embodiment provides a power wireless communication method suitable for distribution network automation. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and send the data to the terminal in the downlink time slot. A scheduling request that includes the channel coding method, rate matching method, and modulation method; the terminal processes the data requested by the base station using the channel coding method, rate matching method, and modulation method selected by the base station according to the scheduling request, and in the uplink The data is sent to the base station in each slot; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel bit error rate can be adopted to maximize the use of the channel and improve the data transmission efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic flow chart of a power wireless communication method suitable for distribution network automation provided by the present invention;

2 is a schematic diagram of a frame structure of a power wireless communication method suitable for distribution network automation provided by the present invention;

3 is a schematic diagram of a time slot structure of a power wireless communication method suitable for distribution network automation provided by the present invention;

Fig. 4 is a specific implementation flowchart of encoding, rate matching and modulation of a power wireless communication method suitable for distribution network automation provided by the present invention;

Fig. 5 is a schematic network structure diagram of a power wireless communication method suitable for distribution network automation provided by the present invention;

Fig. 6 is another schematic flowchart of a power wireless communication method suitable for distribution network automation provided by the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention discloses a power wireless communication method suitable for distribution network automation, which overcomes the problems of low spectrum utilization efficiency and fixed data transmission rate in the prior art, and achieves the purpose of improving data transmission efficiency.

As shown in Figures 1 and 2, the embodiment of the present invention provides a power wireless communication method suitable for distribution network automation. It is pre-set in the data transmission protocol that each frame contains three consecutive downlink time slots and seven consecutive time slots. The frame structure of the uplink time slot; the three consecutive downlink time slots are allocated to the base station, and the seven continuous uplink time slots are allocated to the terminal; the method is:

S101. The base station selects the channel coding mode, rate matching mode and modulation mode corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, and sends a message containing the channel coding mode to the terminal in the downlink time slot , scheduling request for rate matching mode and modulation mode;

S102. The base station receives the data sent by the terminal in the uplink time slot.

The data is the terminal data requested in the scheduling request; the processing process of the data is: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length.

This embodiment provides a power wireless communication method suitable for distribution network automation. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and send the data to the terminal in the downlink time slot. A scheduling request that includes the channel coding method, rate matching method, and modulation method; the terminal processes the data requested by the base station using the channel coding method, rate matching method, and modulation method selected by the base station according to the scheduling request, and in the uplink The data is sent to the base station in each slot; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel without code rate can be adopted, the channel is utilized to the maximum extent, and the data transmission efficiency is improved.

In the above communication process, the base station selects the channel coding mode, rate matching mode and modulation mode corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, specifically, setting a bit error rate threshold in advance , such as 10-5, when the bit error rate of the received data is less than the threshold, keep the communication mode (including channel coding mode, rate matching mode and modulation mode, the same below) unchanged; when the bit error rate of the received data is far less than When the threshold is set, that is, the current channel condition is good (low interference), a more efficient communication method is used to improve data transmission efficiency; when the bit error rate of received data is greater than the threshold (that is, the number of data errors is greater than the set Threshold), a more efficient communication method is used to ensure the correctness of data transmission.

The selection of a communication mode is a dynamic process, which may change as time goes by, and is affected by changes in channel conditions (mainly the amount of interference received by signal transmission) within the time period. If the base station finds that the bit error rate exceeds the threshold at a certain moment, it will adjust the communication method, for example, adopt a communication method with a smaller data carrying length, and then use a smaller one until the bit error rate requirement is met. Similarly, if the base station finds that the bit error rate is very small at a certain moment, it will adopt a communication method with a larger data carrying length, and can adjust it to a higher value according to the bit error rate until the bit error rate exceeds the threshold.

As shown in Figure 3, in the power wireless communication method disclosed in the above embodiment, the time slot length includes:

Data length and time length.

Wherein, the data length is 200 symbols, which sequentially include information data symbols with a data length of 83 symbols, training sequence symbols with a data length of 32 symbols, information data symbols with a data length of 83 symbols, and data symbols with a data length of 2 symbols. Slot interval symbol.

The time length is 10 ms, which sequentially includes information data symbols with a time length of 4.15 ms, training sequence symbols with a time length of 1.6 ms, information data symbols with a time length of 4.15 ms, and slot interval symbols with a time length of 0.1 ms.

It can be seen that the duration of each symbol is 10ms/200=0.05ms.

It can be known from the above content that the time slot includes three types of symbols: information data symbols, training sequence symbols, and time slot interval symbols.

Among them, the information data symbol is used to carry the effective data that needs to be transmitted; the training sequence symbol is used to estimate and correct the frequency deviation between the base station and the terminal; the slot interval symbol is used to prevent inter-slot interference between two slots .

Optionally, in another embodiment of the present invention, the channel coding method includes:

The channel coding method adopts 1/2 or 1/3 rate tail-biting bit convolutional coding.

The convolutional encoder used in the above encoding method includes an input shift register, a modulo two adder, and an output shift register.

The convolutional encoders are specifically (2,1,8) and (3,1,8) convolutional encoders, corresponding to 1/2 and 1/3 rate convolutional encoding respectively.

The principle is: when a character with a length of 8 bits is input in the input shift register, the modulo two adder divides the character into 2 (3) groups, and each group of characters is a part of characters selected from the 8-bit characters, and then in A character with a length of 2 bits (3 bits) is output from the output shift register.

Wherein, different groups of modulo-2 adders take out characters at different positions from the input shift registers for modulo-2 addition, and store calculation results into corresponding output shift registers.

The use of channel coding can improve the anti-interference ability in the process of data transmission and improve the accuracy of data transmission.

Optionally, the modulation method includes:

The modulation method adopts binary phase shift keying BPSK, quadrature phase shift keying QPSK or quadrature amplitude modulation 16QAM.

The above coding methods are all high-order coding methods. Under the same bandwidth, low-order modulations such as FSK (Frequency-Shift Keying, Frequency Shift Keying) and GFSK (Gauss Frequency-Shift Keying, Gaussian Frequency Shift Keying) used in the prior art In this way, one symbol can only represent one unit of data, and the efficiency of spectrum use is low. However, the use of high-order modulation can use one symbol to carry 2 or 4 units of data, and the amount of data can be increased, which in turn improves the efficiency of spectrum use.

Optionally, the rate matching method includes:

The rate matching mode is adjusted according to the bit error rate of the current channel.

The rate matching is also called puncturing, and its purpose is to make the data meet the requirement of the time slot length, and only after the requirement of the time slot length is met, the data transmission can be performed. Combined with different data carrying lengths, channel coding methods, and modulation methods, different numbers of holes need to be punched into the data. The corresponding relationship between the number of punched holes is shown in Table 1.

Table 1 Data encoding and modulation methods corresponding to different bearer data lengths

In Table 1, the third column "data carrying length", the larger the value, the more data transmitted in one time slot. If you need an efficient communication method, use a large value; if you need correct transmission, use a small value.

Specifically, the rate matching process is as follows: taking 1/7 puncturing as an example, as shown in FIG. data, discard the seventh data. That is to say, six consecutive data are input from the front-stage convolutional encoding process 110, and are output to the subsequent modulation process 130 in the rate matching process 120, and the next seventh data is discarded and not sent to the subsequent modulation process 130, The eighth to thirteenth data are output as they are, while the fourteenth data is discarded and not output, and the processing is repeated until the processing of all data in one time slot is completed. The base station can recover the discarded data through the same puncturing method to make the data complete.

Among them, 0/1 means no punching (no discarding), and all received data is output to the subsequent stage.

The rate matching method is adjusted according to the bit error rate of the current channel, specifically:

The current rate matching method is 1/4 punching, and the base station finds that the bit error rate is high during data transmission, that is, adjust the rate matching method to 1/5 punching, continue data transmission, and so on.

Optionally, in another embodiment of the present invention, before processing the data requested by the base station, the method further includes:

Generate CRC check code.

Optionally, the CRC check code is generated in a 12-bit check manner.

The CRC check code is used to check the correctness of data.

This embodiment provides a power wireless communication method suitable for distribution network automation. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and send the data to the terminal in the downlink time slot. A scheduling request that includes the channel coding method, rate matching method, and modulation method; the terminal processes the data requested by the base station using the channel coding method, rate matching method, and modulation method selected by the base station according to the scheduling request, and in the uplink The data is sent to the base station in each slot; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel without code rate can be adopted, the channel is utilized to the maximum extent, and the data transmission efficiency is improved.

Optionally, in another embodiment of the present invention, the seven consecutive uplink time slots are allocated to the terminal, including:

As shown in Figure 5, when the number of terminals in the wireless communication network is seven, each terminal is assigned an uplink time slot;

When the number of terminals in the wireless communication network is less than seven, first assign an uplink time slot to each terminal, and then randomly assign unallocated uplink time slots in a frame structure to the terminals;

When the number of terminals in the wireless communication network is greater than seven, the uplink time slot is allocated to each terminal in a polling manner.

Specifically, the base station is responsible for allocating time slots, and the base station sends time slot allocation information to terminals in three downlink time slots. Under normal circumstances, one terminal corresponds to one uplink time slot. That is, in the above content, when the number of terminals in the wireless communication network is seven, each terminal is assigned an uplink time slot;

If there are redundant free time slots, that is to say, when the number of terminals in the wireless communication network is less than seven, the base station has two processing methods for the extra free uplink time slots: 1. Request a terminal with a large amount of data , multiple time slots are needed to complete the transmission, at this time, the redundant vacant time slots can be assigned to the terminal for use (provided that the pre-allocated time slots to other terminals are not affected); 2. Do nothing in the vacant time slots. No matter which of the above two methods is adopted, in the three downlink time slots of the base station, the base station sends the time slot allocation information to each terminal, so that the terminal can know that there are redundant vacant time slots allocated to itself. Still step by step, one terminal corresponds to one time slot.

This embodiment provides a power wireless communication method suitable for distribution network automation. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and send the data to the terminal in the downlink time slot. A scheduling request that includes the channel coding method, rate matching method, and modulation method; the terminal processes the data requested by the base station using the channel coding method, rate matching method, and modulation method selected by the base station according to the scheduling request, and in the uplink The data is sent to the base station in each slot; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel without code rate can be adopted, the channel is utilized to the maximum extent, and the data transmission efficiency is improved. Also through the allocation and adjustment of uplink time slots, the network communication of power wireless base stations/terminals within a certain range can be met, the demand for light weight can be realized, and the requirements for the processing capacity of power terminals can be reduced.

As shown in Figure 6, the embodiment of the present invention provides a power wireless communication method suitable for distribution network automation. It is pre-set in the data transmission protocol that each frame contains three consecutive downlink time slots and seven consecutive uplink time slots. The frame structure of the time slot; the three consecutive downlink time slots are allocated to the base station, and the seven continuous uplink time slots are allocated to the terminal; the method is:

S201. The terminal receives the scheduling request sent by the base station in the downlink time slot;

The scheduling request includes that the base station selects different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel;

S202. The terminal processes the data requested by the base station by using the channel coding mode, rate matching mode and modulation mode selected by the base station according to the scheduling request, and sends the processed data to the base station in the uplink time slot corresponding to the terminal.

The processing of the data requested by the base station includes: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length.

This embodiment provides a power wireless communication method suitable for distribution network automation. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and send the data to the terminal in the downlink time slot. A scheduling request that includes the channel coding method, rate matching method, and modulation method; the terminal processes the data requested by the base station using the channel coding method, rate matching method, and modulation method selected by the base station according to the scheduling request, and in the uplink The data is sent to the base station in each slot; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel Trojan horse rate can be adopted to maximize the utilization of the channel and improve the transmission efficiency of the data.

An embodiment of the present invention provides a power wireless communication system suitable for distribution network automation, and the system includes:

A base station, which pre-sets a frame structure in which each frame includes three consecutive downlink time slots and seven consecutive uplink time slots in the data transmission protocol; the three continuous downlink time slots are allocated to the base station for use, and the Seven consecutive uplink time slots are allocated to terminals; wherein, the base station includes:

A scheduling request sending unit, configured to select a channel coding method, a rate matching method, and a modulation method corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, and send to the terminal in the downlink time slot including the Scheduling requests for channel coding mode, rate matching mode and modulation mode;

A terminal, characterized in that each frame is pre-set in the data transmission protocol to include a frame structure of three consecutive downlink time slots and seven consecutive uplink time slots; the three consecutive downlink time slots are assigned to the base station For use, the seven consecutive uplink time slots are allocated to terminals; wherein, the terminals include:

The scheduling request receiving unit is used to receive the scheduling request sent by the base station in the downlink time slot, and the scheduling request includes that the base station selects different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel;

The terminal data sending unit is used to process the data requested by the base station by using the channel coding method, rate matching method and modulation method selected by the base station according to the scheduling request, and send the processed data to the uplink time slot corresponding to the terminal sent to the base station;

The processing of the data requested by the base station includes: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length.

The data transmission protocol in this system adopts time division multiplexing (TDM, TimeDivisionMultiplexing) frame structure, and each frame of described frame structure comprises the frame structure of three continuous downlink time slots and seven continuous uplink time slots; The seven consecutive downlink time slots are allocated to the base station, and the seven continuous uplink time slots are allocated to the terminal; the data sent by the base station/terminal in the same wireless network is controlled by a synchronous clock, and the base station/terminal is in the respective assigned time slot Data transmission is carried out within the allocated time slot, and only listening or data reception can be carried out in the non-allocated time slot.

This embodiment provides a power wireless communication system suitable for distribution network automation, including a base station and a terminal. The base station can select different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel, and Send a scheduling request including the channel coding method, rate matching method and modulation method to the terminal in the downlink time slot; the terminal uses the channel coding method, rate matching method and modulation method selected by the base station to send the data requested by the base station according to the scheduling request process, and send the data to the base station in the uplink time slot; through this method, the channel coding method, rate matching method and modulation method most suitable for the current channel Trojan rate situation can be adopted, the channel is utilized to the maximum extent, and the data rate is improved. transmission efficiency. Also through the allocation and adjustment of uplink time slots, the network communication of power wireless base stations/terminals within a certain range can be met, the demand for light weight can be realized, and the requirements for the processing capacity of power terminals can be reduced.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above is only the specific implementation of the application, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the application, some improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of this application.

Claims (14)

1. A power wireless communication method suitable for distribution network automation, characterized in that, each frame is pre-set in the data transmission protocol to include the frame structure of three continuous downlink time slots and seven continuous uplink time slots; The three consecutive downlink time slots are allocated to the base station, and the seven continuous uplink time slots are allocated to the terminal; wherein, the method includes: The base station selects the channel coding mode, rate matching mode and modulation mode corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, and sends a message containing the channel coding mode, rate matching mode and modulation mode to the terminal in the downlink time slot. Scheduling requests for matching modes and modulation modes; The base station receives the data sent by the terminal in the uplink time slot; the data is the terminal data requested in the scheduling request; the data processing process is: perform channel coding, rate matching and modulation on the data requested by the base station, so that after processing The data fits the slot length. 2. The power wireless communication method according to claim 1, wherein the seven consecutive uplink time slots are allocated to terminals, including: When there are seven terminals in the wireless communication network, each terminal is assigned an uplink time slot. 3. The power wireless communication method according to claim 1, wherein the seven consecutive uplink time slots are allocated to terminals, including: When the number of terminals in the wireless communication network is less than seven, an uplink time slot is allocated to each terminal first, and then unallocated uplink time slots in a frame structure are randomly allocated to the terminals. 4. The power wireless communication method according to claim 1, wherein the seven consecutive uplink time slots are allocated to terminals, including: When the number of terminals in the wireless communication network is greater than seven, the uplink time slot is allocated to each terminal in a polling manner. 5. The power wireless communication method according to claim 1, wherein the time slot length comprises: Data length and time length. 6. The power wireless communication method according to claim 5, wherein the data length is 200 symbols, which sequentially include information data symbols with a data length of 83 symbols, training sequence symbols with a data length of 32 symbols, Information data symbols with a data length of 83 symbols, and slot interval symbols with a data length of 2 symbols. 7. The electric power wireless communication method according to claim 5, wherein the time length is 10 ms, which sequentially includes information data symbols with a time length of 4.15 ms, training sequence symbols with a time length of 1.6 ms, and a time length of 4.15 ms The information data symbol, the time slot interval symbol with a time length of 0.1ms. 8. The power wireless communication method according to claim 1, wherein the channel coding method comprises: The channel coding method adopts 1/2 or 1/3 rate tail-biting bit convolutional coding. 9. The power wireless communication method according to claim 1, wherein the modulation method comprises: The modulation method adopts binary phase shift keying BPSK, quadrature phase shift keying QPSK or quadrature amplitude modulation 16QAM. 10. The electric power wireless communication method according to claim 1, further comprising generating a CRC check code before processing the data requested by the base station. 11. A base station, characterized in that each frame is pre-set in the data transmission protocol to include a frame structure of three consecutive downlink time slots and seven consecutive uplink time slots; the allocation of the three consecutive downlink time slots For the base station, the seven consecutive uplink time slots are allocated to the terminal; wherein, the base station includes: A scheduling request sending unit, configured to select a channel coding method, a rate matching method, and a modulation method corresponding to the bit error rate of the current channel according to the bit error rate of the current channel, and send to the terminal in the downlink time slot including the Scheduling requests for channel coding mode, rate matching mode and modulation mode; The terminal data receiving unit is used to receive the data sent by the terminal in the uplink time slot; the data is the terminal data requested in the scheduling request; the data processing process is: channel coding and rate matching the data requested by the base station and modulated so that the processed data fits the slot length. 12. A power wireless communication method suitable for distribution network automation, characterized in that each frame is pre-set in the data transmission protocol to include a frame structure of three consecutive downlink time slots and seven consecutive uplink time slots; The three consecutive downlink time slots are allocated to the base station, and the seven continuous uplink time slots are allocated to the terminal; wherein, the method includes: The terminal receives the scheduling request sent by the base station in the downlink time slot, and the scheduling request includes that the base station selects different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel; The terminal processes the data requested by the base station by using the channel coding method, rate matching method and modulation method selected by the base station according to the scheduling request, and sends the processed data to the base station in the uplink time slot corresponding to the terminal; The processing of the data requested by the base station includes: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length. 13. A terminal, characterized in that each frame is pre-set in the data transmission protocol to include a frame structure of three consecutive downlink time slots and seven consecutive uplink time slots; the allocation of the three consecutive downlink time slots For use by the base station, the seven consecutive uplink time slots are allocated to the terminal; wherein the terminal includes: The scheduling request receiving unit is used to receive the scheduling request sent by the base station in the downlink time slot, and the scheduling request includes that the base station selects different channel coding methods, rate matching methods and modulation methods according to the bit error rate of the current channel; The terminal data sending unit is used to process the data requested by the base station by using the channel coding method, rate matching method and modulation method selected by the base station according to the scheduling request, and send the processed data to the uplink time slot corresponding to the terminal sent to the base station; The processing of the data requested by the base station includes: performing channel coding, rate matching and modulation on the data requested by the base station, so that the processed data conforms to the time slot length. 14. A power wireless communication system suitable for distribution network automation, characterized in that it includes: The base station according to claim 11 and the terminal according to claim 13.