CN113783660B - Transmission method, transmitting terminal and receiving terminal - Google Patents

Transmission method, transmitting terminal and receiving terminal Download PDF

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Publication number
CN113783660B
CN113783660B CN202111058132.6A CN202111058132A CN113783660B CN 113783660 B CN113783660 B CN 113783660B CN 202111058132 A CN202111058132 A CN 202111058132A CN 113783660 B CN113783660 B CN 113783660B
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communication mode
channel state
transmission efficiency
current channel
transmitting end
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CN113783660A (en
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吕宜宣
徐德超
张国宾
郭佳
田甲申
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H04L1/1883—Time-out mechanisms using multiple timers

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application provides a transmission method, a transmitting end and a receiving end, which can adaptively change a communication mode according to real-time channel conditions, ensure stable transmission and simultaneously consider transmission efficiency. The method comprises the following steps: the method comprises the steps that a sending end sends a measurement message to a receiving end according to a candidate communication mode, wherein the measurement message is used for determining the current channel state by the receiving end; the sending end determines a target communication mode according to a receiving result of a feedback message, wherein the feedback message is feedback of the receiving end to the measurement message, and the target communication mode is used for sending service data to the receiving end by the sending end.

Description

Transmission method, transmitting terminal and receiving terminal
Technical Field
The present application relates to the field of power line communication, and more particularly, to a transmission method, a transmitting end, and a receiving end.
Background
Currently, in a power line communication system, a fixed communication mode is mostly adopted. During networking to the central coordinator (central coordinator, CCO) and Stations (STAs), communication configuration parameters (e.g., modulation mode, coding rate, etc.) are typically selected based on the estimated channel quality, and the transmission mode is fixed during network transmission based on the selected communication configuration parameters.
The power line channel environment is closely related to the load and the networking environment where the load is located, and as the types, the number, the power and the like of household appliances are continuously increased, the power line channel environment is complex and changeable, and a plurality of adjacent networks also have mutual interference, so that the channel environment is deteriorated, and the reliability of power line communication is reduced. Therefore, different nodes generally ensure transmission stability in a manner that sacrifices transmission efficiency. Under the condition that the channel environment quality is good, the stable transmission mode cannot give consideration to the transmission efficiency, so that the bandwidth is wasted.
Therefore, in order to adapt to the complex and changeable scenario of the power line transmission channel, a transmission mode capable of dynamically adapting according to the time-varying property of the power line transmission channel is urgently needed, so that the transmission stability is ensured and the transmission efficiency is simultaneously considered.
Disclosure of Invention
The application provides a transmission method, a transmitting end and a receiving end, which can adaptively change a communication mode according to real-time channel conditions, ensure stable transmission and simultaneously consider transmission efficiency.
In a first aspect, a transmission method is provided, including: the method comprises the steps that a sending end sends a measurement message to a receiving end according to a candidate communication mode, wherein the measurement message is used for determining the current channel state by the receiving end;
The sending end determines a target communication mode according to a receiving result of a feedback message, wherein the feedback message is feedback of the receiving end to the measurement message, and the target communication mode is used for sending service data to the receiving end by the sending end.
Alternatively, the feedback message may be determined according to a channel state parameter. By way of example and not limitation, the channel state parameters may include channel attenuation and/or communication error rate.
Optionally, the feedback message may be an Acknowledgement (ACK).
According to the transmission method, the sending end can determine the current channel state according to the receiving result of the feedback message, and further can determine the communication mode (namely, the target communication mode) when the service is transmitted according to the current channel state. By the method for determining the communication mode according to the real-time state of the channel, the transmitting end can give consideration to the high efficiency and stability of transmission, and further the transmission performance of the system can be improved.
In one possible implementation, the candidate communication mode is determined according to at least one of the following configuration parameters: modulation mode, diversity copy number, coding rate and coding length.
In this embodiment of the present application, optionally, the modulation mode of the communication mode with higher transmission efficiency is higher than the modulation mode of the communication mode with lower transmission efficiency, for example, the modulation mode of the communication mode with higher transmission efficiency may be 64QAM (Quadrature Amplitude Modulation ), and the modulation mode of the communication mode with lower transmission efficiency may be 16QAM. Alternatively, the diversity copy number of the communication mode with higher transmission efficiency is smaller than the diversity copy number of the communication mode with lower transmission efficiency, for example, the diversity copy number of the communication mode with higher transmission efficiency may be 2, and the diversity copy number of the communication mode with lower transmission efficiency may be 4. Optionally, the coding rate with higher transmission efficiency is greater than the coding rate of the communication mode with lower transmission efficiency. Alternatively, the code length of the higher transmission efficiency is larger than the code length of the lower transmission efficiency communication mode.
In one possible implementation manner, the determining, by the sending end, the target communication mode according to the receiving result of the feedback packet includes:
the transmitting end determines a channel state parameter according to the received feedback message transmitted by the receiving end, wherein the channel state parameter is used for indicating the current channel state;
when the channel state parameter meets the preset condition, the sending end determines the candidate communication mode as the target communication mode.
When the channel state parameter meets the preset condition, the sending end can send service data to the sending end based on the target communication mode, and when the sending end sends the service data to the sending end based on the target communication mode, the transmission stability can be well ensured, and meanwhile, the transmission efficiency can be improved.
In one possible implementation manner, the determining, by the sending end, the target communication mode according to the receiving result of the feedback packet includes:
the transmitting end repeatedly executes the following operations until the transmitting end receives a feedback message for feeding back a measurement message sent last time, and channel state parameters indicated by the feedback message meet preset conditions, and the candidate communication mode determined last time is determined as the target communication mode:
When the sending end receives a feedback message for feeding back the measurement message sent last time and the channel state parameter indicated by the feedback message does not meet the preset condition, or when the feedback timer expires and the sending end does not receive the feedback message, the candidate communication mode is redetermined;
resetting the feedback timer and sending the measurement message to the receiving end according to the redetermined candidate communication mode;
wherein the transmission efficiency of the last determined candidate communication mode is less than the transmission efficiency of the last determined candidate communication mode.
By the mode, the determined target communication mode enables the transmitting end to better ensure the transmission stability and improve the transmission efficiency when transmitting service data to the transmitting end based on the target communication mode.
In one possible implementation manner, the sending end sends the measurement message to the receiving end according to the candidate communication mode, including:
the sending end continuously sends the measurement message to the receiving end in a preset time period according to the candidate communication mode;
the sending end determines a target communication mode according to a receiving result of the feedback message, and the method comprises the following steps:
When the successful receiving rate of the feedback message is greater than or equal to a preset threshold value in a feedback time period corresponding to the preset time period, the sending end determines the candidate communication mode as the target communication mode; or (b)
The transmitting end repeatedly executes the following operations until, in the feedback period, when the success rate of receiving a feedback message for feeding back a measurement message sent according to the last determined candidate communication mode is greater than or equal to the preset threshold, determining the last determined candidate communication mode as the target communication mode: when the successful receiving rate of the feedback message is smaller than the preset threshold value in the feedback time period, the candidate communication mode is redetermined; continuously sending the measurement message to the receiving end in the preset time period according to the redetermined candidate communication mode;
wherein the transmission efficiency of the last determined candidate communication mode is less than the transmission efficiency of the last determined candidate communication mode.
By the mode, the determined target communication mode enables the transmitting end to better ensure the transmission stability and improve the transmission efficiency when transmitting service data to the transmitting end based on the target communication mode.
In one possible implementation, the method further includes: the transmitting end transmits the service data to the receiving end according to the target communication mode.
In one possible implementation, the method further includes: when the first timer expires, the transmitting end determines the current communication mode as the candidate communication mode and redetermines the new target communication mode.
The setting of the first timer can enable the transmitting end to adjust the communication mode in time under the condition that the channel state is poor, so that the transmission reliability can be ensured while the transmission efficiency is considered.
In one possible implementation, the method further includes: when the second timer expires, the transmitting end determines a communication mode having a transmission efficiency greater than or equal to the current communication mode as the candidate communication mode and re-determines a new target communication mode.
The setting of the second timer can enable the transmitting end to adjust the communication mode in time under the condition that the channel state is good, so that the transmission reliability can be ensured and the transmission efficiency can be considered.
In a second aspect, a transmission method is provided, including: the receiving end receives the measurement message sent by the sending end according to the candidate communication mode;
The receiving end sends a feedback message for feeding back the measurement message to the sending end according to the measurement message, wherein the feedback message is used for determining a target communication mode by the sending end, and the target communication mode is used for sending service data to the receiving end by the sending end.
According to the transmission method, the sending end can determine the current channel state according to the receiving result of the feedback message, and further can determine the communication mode (namely, the target communication mode) when the service is transmitted according to the current channel state. By the method for determining the communication mode according to the real-time state of the channel, the transmitting end can give consideration to the high efficiency and stability of transmission, and further the transmission performance of the system can be improved.
In one possible implementation, the candidate communication mode is determined according to at least one of the following configuration parameters: modulation mode, diversity copy number, coding rate and coding length.
In one possible implementation manner, the sending, by the receiving end, a feedback packet for feeding back the measurement packet to the sending end according to the measurement packet includes: the receiving end determines a channel state parameter according to the measurement message, and generates and transmits the feedback message according to the channel state parameter, wherein the channel state parameter is used for indicating the current channel state.
In one possible implementation, the method further includes: the receiving end receives the service data sent by the sending end according to the target communication mode.
In a third aspect, a transmitting end is provided for performing the method of the first aspect or any possible implementation of the first aspect. In particular, the sender comprises means for performing the method of the first aspect or any possible implementation of the first aspect.
In a fourth aspect, a receiving end is provided for performing the method of the second aspect or any possible implementation of the second aspect. In particular, the receiving end comprises means for performing the method of the second aspect or any possible implementation of the second aspect.
In a fifth aspect, a sender is provided, the sender comprising a memory for storing a computer program and a processor for calling and running the computer program from the memory, such that the sender performs the method of the first aspect and any possible implementation of the first aspect.
In a sixth aspect, a receiving end is provided, the receiving end comprising a memory for storing a computer program and a processor for calling and running the computer program from the memory, such that the receiving end performs the method of the second aspect and any possible implementation manner of the second aspect.
In a seventh aspect, a computer readable storage medium is provided for storing a computer program comprising instructions for performing the above aspects and any possible implementation of the above aspects.
In an eighth aspect, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of the above aspects and any possible implementation thereof.
Drawings
Fig. 1 is a power line communication system applied to the present application.
Fig. 2 is a schematic flow chart of a transmission method according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of one specific embodiment of a transmission method according to the present application.
Fig. 4 is a schematic flow chart of yet another specific embodiment of a transmission method according to the present application.
Fig. 5 is a schematic block diagram of a transmitting end according to an embodiment of the present application.
Fig. 6 is a schematic block diagram of a receiving end according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of a transmitting end according to yet another embodiment of the present application.
Fig. 8 is a schematic block diagram of a receiving end according to yet another embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described below with reference to the accompanying drawings.
Fig. 1 illustrates a power line communication system 100 according to an embodiment of the present application. As shown in fig. 1, the system 100 may include at least one central coordinator (central coordinator, CCO) and at least one Station (STA). For example, CCO 110, STA 120 to STA 170. According to a certain networking principle, the STA on the power line takes CCO as a root node to form a network with a specific function. Taking the power line remote meter reading service as an example, the CCO is taken as a concentrator, the STA is taken as an intelligent ammeter, and the CCO completes networking through a certain principle, so that the remote meter reading service can be carried out on the intelligent ammeter in the network. The CCO and the STA keep communication and exchange information in the network; different networks can be mutually identified among the networks, so that collision is avoided, and normal communication in the networks is ensured.
Currently, power line communication systems, such as the system 100 shown in fig. 1, typically employ a fixed communication mode to ensure stability of transmission. However, this fixed communication mode cannot achieve transmission efficiency while ensuring stable transmission, resulting in waste of bandwidth.
For this purpose, the present application provides a transmission method that can be applied to a power line communication system as shown in fig. 1. The method can adaptively change the communication mode according to the real-time channel condition in the communication process, and can ensure stable transmission and simultaneously consider the transmission efficiency.
It should be understood that the transmission method according to the present application described below may be applied between a CCO and an STA, for example, between a CCO 110 and an STA 120 shown in fig. 1, and may also be applied between two STAs, for example, between an STA 120 and an STA 130, which is not particularly limited in the embodiments of the present application.
Alternatively, the communication modes, such as candidate communication modes, according to embodiments of the present application may be determined according to any one of the following configuration parameters or any combination of the following configuration parameters:
modulation mode, diversity copy number, code rate or code length.
In other words, the communication mode represents at least one configuration parameter of modulation mode, diversity copy number, coding rate, and coding length employed by two nodes (e.g., CCO and STA) when transmitting data. Alternatively, the communication mode may be a communication mode defined by at least one configuration parameter selected from the group consisting of a modulation mode, a diversity copy number, a code rate, and a code length.
The communication modes represented under the different configuration parameters are different. Generally, to improve the stability of transmission, a lower modulation mode and more diversity copy times are generally used for transmission; to improve transmission efficiency, higher modulation modes and fewer diversity copies are typically used for transmission.
In this embodiment of the present application, optionally, the modulation mode of the communication mode with higher transmission efficiency is higher than the modulation mode of the communication mode with lower transmission efficiency, for example, the modulation mode of the communication mode with higher transmission efficiency may be 64QAM, and the modulation mode of the communication mode with lower transmission efficiency may be 16QAM. Alternatively, the diversity copy number of the communication mode with higher transmission efficiency is smaller than the diversity copy number of the communication mode with lower transmission efficiency, for example, the diversity copy number of the communication mode with higher transmission efficiency may be 2, and the diversity copy number of the communication mode with lower transmission efficiency may be 4. Optionally, the coding rate with higher transmission efficiency is greater than the coding rate of the communication mode with lower transmission efficiency. Alternatively, the code length of the higher transmission efficiency is larger than the code length of the lower transmission efficiency communication mode.
It should be appreciated that specific details regarding the modulation mode, diversity copy number, coding rate, or definition of coding length may be referred to in the art, and will not be described in detail herein for brevity.
Fig. 2 is a schematic flow chart of a transmission method according to one embodiment of the present application. The transmitting end in the method shown in fig. 2 may be CCO, and the receiving end may be STA; alternatively, the transmitting end may be STA and the receiving end may be CCO; alternatively, the transmitting end is one STA, and the receiving end is another STA, which is not specifically limited in the embodiments of the present application.
S210, the transmitting end transmits the measurement message to the receiving end according to the candidate communication mode.
Specifically, the transmitting end may first select a candidate communication mode with higher transmission efficiency, and send a message (for convenience of description, referred to as a measurement message) to the receiving end based on the candidate communication mode, for example, the transmitting end may transmit the sending message based on a higher modulation mode and a fewer diversity copy number. The receiving end can determine whether the current channel state is suitable for the candidate communication mode or whether the candidate communication mode is suitable for the current channel state according to the receiving condition of the measurement message.
Optionally, when sending the measurement message to the receiving end according to the candidate communication mode, the sending end may continuously send the measurement message to the receiving end according to the candidate communication mode in a preset period. For example, the transmitting end may periodically or aperiodically transmit the measurement message to the receiving end based on the candidate communication mode in a preset period. Alternatively, the transmitting end may send the measurement message only once based on the candidate communication mode. The embodiment of the application does not specifically limit what mode is adopted by the transmitting end to transmit the measurement message.
It should be understood that the embodiment of the present application does not limit the specific content and form of the measurement message. For example, the measurement message may be a message predefined by the transmitting end and the receiving end and having a specific form or content, and the receiving end can determine that the received message is the measurement message according to the form or content of the received message. Further, the receiving end can determine the current channel state according to the information such as whether the content of the message is complete or not or whether the content of the message is correct or not. For another example, the measurement message may also be a message that is predefined by the sending end and the receiving end and sent by the sending end at a specific time, and if the receiving end receives the message at the specific time, the message may be determined to be the measurement message.
Optionally, the method may further include: s220, the receiving end sends a feedback message to the sending end.
For example, after receiving the measurement message sent by the sending end, the receiving end may determine the channel state parameter for indicating the current channel state by analyzing the measurement message, generate a feedback message according to the channel state parameter, and feed back the current channel state to the sending end in the form of the feedback message.
By way of example and not limitation, the channel state parameters may include parameters such as a communication success flag, channel attenuation, communication error rate, and the like. In this case, the receiving end can determine parameters such as channel attenuation and communication error rate by analyzing the measurement message, and generate a feedback message according to the parameters such as channel attenuation and communication error rate, and feed back the feedback message to the transmitting end. The receiving end can determine the current channel state according to the channel state parameters in the feedback message. For example, when the channel attenuation and the communication error rate are large, the transmission is unstable, the current channel state is poor, and the candidate communication mode is not suitable for transmission. Or when the channel attenuation and the communication error rate are smaller, the transmission is relatively stable, the current channel state is better, and the method is suitable for adopting the candidate communication mode for transmission.
For another example, the feedback message may be a message, such as an ACK, which only indicates that the receiving end successfully receives the measurement message. That is, as long as the receiving end receives the measurement message, the receiving end directly transmits ACK to the transmitting end.
In this case, optionally, the transmitting end may determine the channel state according to the successful reception rate of the feedback packet in the feedback period corresponding to the preset period. For example, in the feedback time period, when the successful receiving rate of the feedback message is greater than or equal to a preset threshold, the sending end considers that the channel state is good or stable; and in the feedback time period, when the successful receiving rate of the feedback message is smaller than the preset threshold, the sending end considers that the channel state is poor or unstable.
It should be understood that the successful receiving rate of the feedback message refers to the ratio of the number of times the receiving end should receive the feedback message to the number of times the receiving end actually receives the feedback message in the feedback period corresponding to the preset period. Or, the successful receiving rate of the feedback message is the ratio of the number of times of the measurement message actually sent by the receiving end in the preset time period to the number of times of the feedback message actually received by the sending end in the feedback time period corresponding to the preset time period.
It should be understood that the transmitting end may continuously transmit the measurement message multiple times within the preset time period. And, the sending end may set the response time of the feedback packet, for example, the sending end may set the response time through a feedback timer. If the transmitting end does not receive the feedback message within the response time after transmitting the measurement message, the receiving end is not informed of receiving the measurement message, or the receiving end receives the measurement message and transmits the feedback message, but the receiving end is not informed of receiving the feedback message due to poor channel state. And if the sending end receives the feedback message within the response time after sending the measurement message, the communication is successful.
It can be understood that the feedback period corresponding to the preset period is the response time corresponding to the multiple measurement messages sent. For example, the preset time period may be 10 seconds(s), the time of the feedback timer is 0.2s, and the transmitting end may transmit the measurement message based on the same candidate communication mode every 0.5s within 10 s. If the sending end does not receive the feedback message within 0.2s after sending the measurement message, the communication failure is indicated; if the sending end receives the feedback message within 0.2s after sending the measurement message, the communication is successful. Assuming that the preset threshold is 90%, if the number of times of feedback messages received by the transmitting end within 14s after the first transmitting of the measurement message is greater than or equal to 18, the transmitting end considers that the channel state is good or stable, otherwise, the transmitting end considers that the channel state is poor or unstable.
It should also be understood that the preset time period and the preset threshold may be preset by the system, or may be negotiated by the transmitting end and the receiving end, which is not limited in this embodiment of the present application.
S230, the sending end determines a target communication mode according to the receiving result of the feedback message.
Specifically, according to the manner in which the transmitting end transmits the measurement message, the receiving result of the feedback message may include multiple situations. The following four cases are examples:
case one: the sender receives the feedback message, i.e. the method step comprises S220.
And a second case: the sending end does not receive the feedback message when the feedback timer expires, i.e. the method step does not include S220, or the receiving end does not execute S220.
And a third case: and in the feedback time period, the successful receiving rate of the feedback message is larger than or equal to a preset threshold value.
Case four: and in the feedback time period, the successful receiving rate of the feedback message is smaller than a preset threshold value.
For the first and second cases, for example, the transmitting end may set a feedback timer, and the transmitting end starts the feedback timer while transmitting the measurement message, and if the transmitting end receives the feedback message before the feedback timer expires, the transmitting end may determine the current channel state according to the feedback message, for example, the channel state parameter in the feedback message. If the sending end does not receive the feedback message before the expiration of the feedback timer, it indicates that the receiving end does not receive the measurement message sent by the sending end, or the receiving end receives the measurement message and sends the feedback message, but the sending end does not successfully receive the feedback message due to poor channel state.
Aiming at the third and fourth cases, for example, when the successful receiving rate of the feedback message is greater than or equal to a preset threshold value in the feedback time period, the sending end considers that the channel state is good or stable; and in the feedback time period, when the successful receiving rate of the feedback message is smaller than the preset threshold, the sending end considers that the channel state is poor or unstable.
It can be understood that, because the transmission efficiency and the transmission stability of different communication modes are different, the transmitting end can determine whether the current channel state is suitable for the transmitting end to communicate with the receiving end by adopting the communication mode adopted when the transmitting end transmits the measurement message last time according to the receiving result of the feedback message.
Next, several specific ways for determining the target communication mode by the transmitting end according to the receiving result of the feedback message are described in detail.
In the second and third modes, the candidate communication modes determined by the transmitting end each time are different, and the transmission efficiency of the candidate communication mode determined last time is smaller than the transmission efficiency of the candidate communication mode determined last time.
Mode one:
the sending end can determine the channel state parameter according to the feedback message sent by the receiving end; and when the channel state parameter meets a preset condition, the sending end determines the candidate communication mode as the target communication mode.
For example, when the communication success flag bit in the feedback message indicates that communication is successful, the degree of channel attenuation satisfies a preset condition, and the communication error rate satisfies the preset condition, the transmitting end considers that the transmitting end transmits service data to the transmitting end based on the candidate communication mode, and the current channel state can satisfy the stability of service transmission, so that the candidate communication mode is determined as a target communication mode, and the service data is transmitted to the receiving end based on the target communication mode.
It should be understood that the preset conditions referred to in the present application are preset by the system, or may be negotiated by the transmitting end and the receiving end, which is not limited in this embodiment of the present application. For example, the preset condition may be that the degree of channel attenuation is less than 3db and the communication error rate is less than 0.2 (number of bits per total number of bits).
Mode two:
the transmitting end repeatedly executes the following operations until the transmitting end receives a feedback message for feeding back a measurement message sent last time, and channel state parameters indicated by the feedback message meet preset conditions, and the candidate communication mode determined last time is determined as the target communication mode:
when the sending end receives a feedback message for feeding back the measurement message sent last time and the channel state parameter indicated by the feedback message does not meet the preset condition, or when the feedback timer expires and the sending end does not receive the feedback message, the candidate communication mode is redetermined;
Resetting the feedback timer and transmitting the measurement message to the receiving end according to the redetermined candidate communication mode.
Specifically, when the channel state parameter does not satisfy the preset condition, the transmitting end considers that the current channel state cannot satisfy the stable transmission of the transmitting end based on the candidate communication mode and the receiving end, so that the transmitting end continues to search for a proper communication mode. The specific process is that the transmitting end redetermines a candidate communication mode, and the transmission efficiency of the redetermined candidate communication mode is lower than that of the last candidate communication mode. The sending end sends a measurement message to the receiving end according to the redetermined candidate communication mode, if the receiving end does not feed back the measurement message or if the receiving end feeds back the measurement message but the channel state parameter in the feedback message does not meet the preset condition, the sending end repeatedly executes the redetermined candidate communication mode and sends the measurement message to the receiving end based on the redetermined candidate communication mode; and if the receiving end feeds back the measurement message and the channel state parameter in the feedback message meets the preset condition, the sending end takes the candidate communication mode determined last time as the target communication mode.
Mode three:
under the condition that the sending end continuously sends the measurement message to the receiving end in a preset time period according to the candidate communication mode, when the successful receiving rate of the feedback message is greater than or equal to a preset threshold value in a feedback time period corresponding to the preset time period, the sending end determines the candidate communication mode as the target communication mode; or (b)
The transmitting end repeatedly executes the following operations until, in the feedback period, when the success rate of receiving a feedback message for feeding back a measurement message sent according to a last determined candidate communication mode is greater than or equal to a preset threshold, determining the last determined candidate communication mode as the target communication mode: when the successful receiving rate of the feedback message is smaller than the preset threshold value in the feedback time period, the candidate communication mode is redetermined; and continuously sending the measurement message to the receiving end in the preset time period according to the redetermined candidate communication mode.
Specifically, after the sending end continuously sends the measurement message to the receiving end in a preset time period according to the candidate communication mode, if the successful receiving rate of the feedback message is greater than or equal to a preset threshold value in the feedback time period, the sending end considers that the channel state is good or stable, and then the candidate communication mode can be determined as a target communication mode; if the successful receiving rate of the feedback message is smaller than the preset threshold in the feedback time period, the sending end considers that the channel state is poor or unstable, the sending end considers that the current candidate communication mode is unsuitable, the communication mode with the transmission efficiency smaller than that of the previous candidate communication mode is redetermined, the measurement message is continuously sent to the receiving end in the preset time period based on the redetermined candidate communication mode until the successful receiving rate of the feedback message is larger than or equal to the preset threshold in the feedback time period, and the candidate communication mode is determined to be the target communication mode.
It should be appreciated that the sender may reset the feedback timer each time the sender sends a measurement message.
Optionally, after the transmitting end determines the target communication mode, the method may further include:
s240, the sending end sends the service data to the receiving end according to the target communication mode.
According to the transmission method, the sending end can determine the current channel state according to the receiving result of the feedback message, and further can determine the communication mode (namely, the target communication mode) when the service is transmitted according to the current channel state. By the method for determining the communication mode according to the real-time state of the channel, the transmitting end can give consideration to the high efficiency and stability of transmission, and further the transmission performance of the system can be improved.
Optionally, the method may further include: when the first timer expires, the transmitting end determines the current communication mode as the candidate communication mode and re-determines a new target communication mode.
Specifically, due to the time-varying nature of the channel state, in the case of a degraded channel state, the previously determined target communication mode may not be suitable for the current channel state, or the current channel state may not be suitable for the previously determined target communication mode, so in order to ensure the stability of transmission as much as possible while taking into account the efficiency of transmission, the transmitting end may set a first timer, and when the first timer expires, a new target communication mode, that is, a communication mode suitable for the current channel state, is newly determined according to the channel state. In specific implementation, the transmitting end may determine the current communication mode, that is, the communication mode adopted when the current transmitting end transmits the service data to the receiving end, as the candidate communication mode, and then redetermine the new target communication mode by adopting the method described above.
In general, in the case where the channel state is degraded, the transmission efficiency of the target communication mode redetermined by the transmitting end is smaller than that of the current communication mode.
Therefore, by the method for determining the communication mode according to the real-time state of the channel, the transmitting end can better consider the high efficiency and stability of transmission, and further the transmission performance of the system can be improved.
Optionally, the method may further include: when the second timer expires, the transmitting end determines a communication mode having a transmission efficiency greater than or equal to the current communication mode as the candidate communication mode and re-determines a target communication mode.
Specifically, due to the time-varying nature of the channel state, in the case that the channel state is good, the previously determined target communication mode may not be suitable for the current channel state, or the current channel state may not be suitable for the previously determined target communication mode, so in order to achieve both the efficiency of transmission and the stability of transmission, the transmitting end may set a second timer, and when the second timer expires, a new target communication mode, that is, a communication mode suitable for the current channel state, is redetermined according to the channel state. In specific implementation, the transmitting end may determine a communication mode with a transmission efficiency greater than or equal to the current communication mode as the candidate communication mode, and then redetermine a new target communication mode by using the method described above.
In general, in the case where the channel state becomes good, the transmission efficiency of the target communication mode redetermined by the transmitting end is greater than that of the current communication mode. Therefore, by the method for determining the communication mode according to the real-time state of the channel, the transmitting end can better consider the high efficiency and stability of transmission, and further the transmission performance of the system can be improved.
It should be noted that, the duration of the first timer and the second timer is not limited in this application. Optionally, the duration of the first timer may be greater than the duration of the second timer, and the duration of the first timer may be less than the duration of the second timer.
The transmission method of the present application is described in detail below in connection with specific embodiments.
Fig. 3 shows a schematic flow chart of a transmission method according to a specific embodiment of the present application.
And S310, the first STA sends a measurement message to the second STA according to the first candidate communication mode, and simultaneously sets a feedback timer.
S320, in the case that the second STA receives the measurement message, the second STA sends a feedback message (for convenience of description, referred to as a first feedback message) to the first STA.
Specifically, after the second STA receives the measurement packet, the second STA parses the measurement packet, and determines channel state parameters, for example, information such as channel attenuation, communication error rate, and the like. And generating a first feedback message by the second STA according to the determined channel state parameters, and sending the first feedback message to the first STA.
S330, after receiving the first feedback message, the first STA judges whether the channel state parameter in the first feedback message meets the preset condition.
Specifically, if the first STA receives the first feedback packet before the expiration of the feedback timer, it determines whether the channel state parameter meets the preset condition by parsing the first feedback packet.
S340, the first STA determines a second candidate communication mode.
Specifically, if the channel state parameter does not satisfy the preset condition, the first STA re-determines the candidate communication mode. For convenience of description, the currently redetermined candidate communication mode is referred to herein as the second candidate communication mode. It is understood that the transmission efficiency of the second candidate communication mode is lower than the transmission efficiency of the first candidate communication mode.
And S350, the first STA transmits a measurement message to the second STA according to the second candidate communication mode.
S360, in the case that the second STA receives the measurement message, the second STA sends a feedback message (for convenience of description, referred to as a second feedback message) to the first STA.
Specifically, after the second STA receives the measurement packet, the second STA parses the measurement packet, and determines channel state parameters, for example, information such as channel attenuation, communication error rate, and the like. And generating a second feedback message by the second STA according to the determined channel state parameters, and sending the second feedback message to the first STA.
And S370, after the first STA receives the second feedback message, judging whether the channel state parameter in the second feedback message meets the preset condition.
Specifically, if the first STA receives the second feedback packet before the expiration of the feedback timer, it determines whether the channel state parameter meets the preset condition by parsing the second feedback packet.
And S380, the first STA transmits service data to the second STA in the second candidate communication mode.
Specifically, if the channel state parameter in the second feedback packet meets the preset condition, the first STA determines the second candidate communication mode as the target communication mode, and sends the service data to the second STA by adopting the second candidate communication mode.
Therefore, the second candidate communication mode determined by the method of the embodiment of the application can better consider the high efficiency and stability of transmission, and further can improve the transmission performance of the system.
Optionally, the transmitting end may further set a first feedback timer and a second feedback timer, and if the duration of the first feedback timer is smaller than the duration of the second feedback timer, the first STA may send service data to the second STA based on the second candidate communication mode until the first feedback timer expires. After the expiration of the first feedback timer, the first STA may re-determine the communication mode. And, the transmitting end may re-determine the communication mode using the method shown in fig. 3.
Fig. 4 shows a schematic flow chart of a transmission method according to another specific embodiment of the present application. It should be understood that the method shown in fig. 4 is illustrated with the first STA and the second STA being a transmitting end and a receiving end, respectively, but this should not constitute any limitation to the present application.
(1) The first STA sets a first timer and a second timer. And the first STA sends a measurement message to the second STA according to the candidate communication mode, and simultaneously sets a feedback timer.
(2) If the second STA receives the measurement message, the second STA analyzes the measurement message, generates a feedback message according to the information such as the communication success identification, the channel attenuation, the communication error rate and the like, and then sends the feedback message to the first STA.
(3) The first STA selects to execute the following step I or step II according to whether a feedback message sent by the second STA is received before the feedback timer is not expired:
step I:
if the first STA receives the feedback message sent by the second STA before the feedback timer expires, the first STA analyzes the feedback message, evaluates the current channel state and judges whether the current candidate communication mode is determined as the target communication mode. If the first STA judges that the current channel state is good, transmitting service data to the second STA by adopting the current candidate communication mode, and executing the operation described in the step (4); if the second STA judges that the current channel state is poor, a communication mode lower than the current transmission efficiency is adopted to send a measurement message to the second STA. The second STA then jumps back to (2), starting from (2) and continuing to perform the method of the present application.
Step II:
if the first STA does not receive the feedback message sent by the second STA before the feedback timer expires, the first STA adopts a communication mode lower than the current transmission efficiency to send a measurement message to the second STA. The second STA then jumps back to (2), starting from (2) and continuing to perform the method of the present application.
(4) The first STA transmits traffic data to the second STA using the current candidate communication mode. And:
if the first timer does not expire, the first STA continues to send service data to the second STA in the current communication mode;
if the first timer expires but the second timer does not expire, the second STA sends a measurement message to the second STA in a communication mode lower than the current transmission efficiency, and then the second STA jumps back to (2), and the method of the application is continuously executed from (2);
if the first timer expires and the second timer expires, the second STA transmits a measurement message to the second STA in a communication mode not lower than the current transmission efficiency. The second STA then jumps back to (2), starting from (2) and continuing to perform the method of the present application.
In this way, the first STA and the second STA continuously judge the current channel state according to the communication condition according to the method, adaptively switch the communication modes with different transmission efficiencies, and consider the stability and the efficiency of transmission.
The transmission method according to the embodiment of the present application is described above with reference to fig. 2 to 4. Next, a transmitting end and a receiving end according to an embodiment of the present application are described with reference to fig. 5 to 8.
Fig. 5 is a schematic block diagram of a sender 500 according to an embodiment of the present application. As shown in fig. 5, the transmitting end 500 includes: a transmitting unit 510 and a processing unit 520.
A sending unit 510, configured to send a measurement packet to a receiving end according to a candidate communication mode, where the measurement packet is used for determining a current channel state by the receiving end;
and the processing unit 520 is configured to determine a target communication mode according to a receiving result of a feedback packet, where the feedback packet is feedback of the receiving end to the measurement packet, and the target communication mode is used for the transmitting end to transmit service data to the receiving end.
It should be understood that each unit in the transmitting end 500 may be used to perform each action or process in the transmitting end in the method shown in fig. 2 or the first STA in the methods shown in fig. 3 and 4, respectively. Here, in order to avoid redundancy, detailed description thereof is omitted.
Fig. 6 is a schematic block diagram of a receiving end 600 according to an embodiment of the present application. As shown in fig. 6, the receiving end 600 includes: a receiving unit 610 and a transmitting unit 620.
A receiving unit 610, configured to receive a measurement message sent by a sending end according to a candidate communication mode;
and a sending unit 620, configured to send, to the sending end according to the measurement packet, a feedback packet for feeding back the measurement packet, where the feedback packet is used for the sending end to determine a target communication mode, and the target communication mode is used for the sending end to send service data to the receiving end.
It should be understood that each unit in the receiving end 600 may be used to perform each action or process in the receiving end in the method shown in fig. 2 or the second STA in the methods shown in fig. 3 and 4, respectively. Here, in order to avoid redundancy, detailed description thereof is omitted.
Fig. 7 shows a schematic block diagram of a transmitting end 700 according to an embodiment of the present application. As shown in fig. 7, the transmitting end 700 includes: transceiver 710, processor 720, and memory 730. Wherein the transceiver 710, the processor 720 and the memory 730 communicate with each other via internal communication paths to transfer control and/or data signals.
A transceiver 710, configured to send a measurement packet to a receiving end according to a candidate communication mode, where the measurement packet is used by the receiving end to determine a current channel state;
And a processor 720, configured to determine a target communication mode according to a receiving result of a feedback packet, where the feedback packet is feedback of the receiving end to the measurement packet, and the target communication mode is used for the sending end to send service data to the receiving end.
It should be appreciated that when the processor 720 invokes and runs the computer program from the memory, the processor 720 may be configured to perform the method described above and implement the execution body of the method, such as the function of the transmitting end or the first STA.
Fig. 8 shows a schematic block diagram of a receiving end 800 according to an embodiment of the present application. As shown in fig. 8, the receiving end 800 includes: a transceiver 810, a processor 820, and a memory 830. Wherein the transceiver 810, the processor 820, and the memory 830 communicate with each other via internal communication paths to transfer control and/or data signals.
A transceiver 810, configured to receive a measurement message sent by a sending end according to a candidate communication mode;
the transceiver 810 is further configured to send, to the sending end, a feedback packet for feeding back the measurement packet according to the measurement packet, where the feedback packet is used by the sending end to determine a target communication mode, and the target communication mode is used by the sending end to send service data to the receiving end.
It should be appreciated that when the processor 820 invokes and runs the computer program from the memory, the processor 820 may be configured to perform the above method and implement the execution body of the method, such as the function of the receiving end or the second STA.
The embodiment of the application can be applied to a processor or realized by the processor. The processor may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a central processing unit (central processing unit, CPU), it may also be other general purpose processor, digital signal processor (digital signal processor, DSP), application specific integrated circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software in a decoded processor. The software device may be located in a random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DRRAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (12)

1. A transmission method applied to a power line communication system, the method comprising:
the method comprises the steps that a sending end periodically evaluates a current channel state, wherein the current channel state is used for indicating the transmission efficiency of communication between the sending end and a receiving end;
the sending end judges whether to switch the current candidate communication mode into a target communication mode or not based on the current channel state;
the transmitting end periodically evaluates the current channel state, including:
the sending end periodically sends a measurement message to the receiving end;
the transmitting end determines the current channel state according to the successful receiving rate of the received feedback message;
the sending end judges whether to switch the current candidate communication mode to the target communication mode based on the current channel state, and the method comprises the following steps:
if the transmitting end judges that the transmission efficiency corresponding to the current channel state is greater than or equal to a first preset threshold value, the transmitting end determines to keep the current candidate communication mode;
and if the transmitting end judges that the transmission efficiency corresponding to the current channel state is smaller than the first preset threshold, the transmitting end switches the current candidate communication mode into the target communication mode, and the transmission efficiency of the target communication mode is lower than that of the current candidate communication mode.
2. The method of claim 1, wherein the method further comprises:
the sending terminal re-determines the current channel state after switching the current candidate communication mode to the preset time of the target communication mode;
and if the transmitting end determines that the transmission efficiency corresponding to the current channel state is greater than or equal to the first preset threshold, the transmitting end switches the target communication mode into a communication mode with the transmission efficiency higher than that of the target communication mode.
3. The method of claim 1 or 2, wherein the determining, by the transmitting end, that the transmission efficiency corresponding to the current channel state is greater than or equal to a preset threshold includes:
when the successful receiving rate of the feedback message received by the sending end is greater than or equal to a second preset threshold value, determining that the transmission efficiency corresponding to the current channel state is greater than or equal to the first preset threshold value;
when the successful receiving rate of the feedback message received by the sending end is smaller than the second preset threshold, determining that the transmission efficiency corresponding to the current channel state is smaller than the first preset threshold.
4. The method according to claim 1 or 2, wherein the communication mode between the transmitting end and the receiving end is determined according to at least one of the following configuration parameters:
Modulation mode, diversity copy number, code rate or code length.
5. The method of claim 4, wherein the current candidate communication mode has a higher modulation mode than the target communication mode, and wherein the current candidate communication mode has a lower diversity copy number than the target communication mode.
6. A transmitting terminal in a power line communication system, the transmitting terminal comprising:
the processing unit is used for periodically evaluating the current channel state, and the current channel state is used for indicating the transmission efficiency of the communication between the sending end and the receiving end;
the processing unit is used for judging whether to switch the current candidate communication mode into a target communication mode or not based on the current channel state;
the transmitting end further comprises a transmitting unit for:
periodically sending a measurement message to the receiving end;
the processing unit is specifically configured to:
determining the current channel state according to the successful receiving rate of the received feedback message;
the processing unit is specifically configured to:
if the transmission efficiency corresponding to the current channel state is judged to be greater than or equal to a first preset threshold value, determining to keep the current candidate communication mode;
And if the transmission efficiency corresponding to the current channel state is judged to be smaller than the first preset threshold value, switching the current candidate communication mode into the target communication mode, wherein the transmission efficiency of the target communication mode is lower than that of the current candidate communication mode.
7. The transmitting end of claim 6, wherein the processing unit is further configured to:
after the current candidate communication mode is switched to the preset time of the target communication mode, the current channel state is redetermined;
and if the transmission efficiency corresponding to the current channel state is determined to be greater than or equal to the first preset threshold, switching the target communication mode into a communication mode with the transmission efficiency higher than that of the target communication mode.
8. The transmitting end according to claim 6 or 7, wherein the processing unit is specifically configured to:
when the successful receiving rate of the feedback message received by the sending end is greater than or equal to a second preset threshold value, determining that the transmission efficiency corresponding to the current channel state is greater than or equal to the first preset threshold value;
when the successful receiving rate of the feedback message received by the sending end is smaller than the second preset threshold, determining that the transmission efficiency corresponding to the current channel state is smaller than the first preset threshold.
9. The transmitting end according to claim 6 or 7, wherein the communication mode between the transmitting end and the receiving end is determined according to at least one of the following configuration parameters:
modulation mode, diversity copy number, code rate or code length.
10. The transmitting end of claim 9, wherein a modulation mode of the current candidate communication mode is higher than a modulation mode of the target communication mode, and a diversity copy number of the current candidate communication mode is lower than a diversity copy number of the target communication mode.
11. A transmitting terminal, characterized in that it comprises a processor and a memory for storing program code, the processor being adapted to call and run the program code from the memory, so that the transmitting terminal performs the method according to any of claims 1 to 5.
12. A computer readable storage medium for storing a computer program which, when executed by a computer, causes the computer to perform the method of any one of claims 1 to 5.
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