CN113556779A - Data transmission method in industrial Internet of things - Google Patents
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0226—Traffic management, e.g. flow control or congestion control based on location or mobility
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- H—ELECTRICITY
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
Abstract
The invention discloses a data transmission method in an industrial Internet of things, which comprises the following steps: the method comprises the steps that a second communication node feeds back first channel state information, positioning reference signal arrival time and angle information to a first communication node, the first communication node sends uplink detection reference signal configuration information, X third communication nodes which are closest to the possible positions of the second communication node are activated, the second communication node sends uplink detection reference signals, the first communication node modulates N data bits, a plurality of modulation symbols obtained after modulation are shared to the X third communication nodes, the first communication node and the X third communication nodes send the plurality of modulation symbols to the second communication node, the second communication node checks the N data bits obtained after processing, and feedback information containing successful or failed receiving information is generated to the first communication node. The invention can improve the reliability and efficiency of data channel transmission.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a data transmission method in an industrial Internet of things.
Background
The 5G can meet diversified business requirements of people in various areas such as residence, work, leisure and traffic, and can provide extremely-sophisticated business experience such as ultra-high-definition videos, virtual video reality, augmented reality, cloud desktops and online games for users even in scenes with ultra-high traffic density, ultra-high connection number density and ultra-high mobility characteristics such as dense residential areas, offices, stadiums, outdoor parties, subways, expressways, high-speed rails and wide area coverage. Meanwhile, 5G can permeate into the fields of the Internet of things and various industries, is deeply integrated with industrial facilities, medical instruments, vehicles and the like, effectively meets the diversified business requirements of the vertical industries such as industry, medical treatment, transportation and the like, and realizes real 'everything interconnection'.
The 5G application scenarios can be divided into two Broad categories, namely Mobile broadband (MBB) and internet of Things (IoT), wherein the main technical requirement of Mobile broadband access is high capacity, providing high data rate, to meet the increasing demand of data service. The internet of things is mainly driven by the requirement of Machine Communication (MTC), and can be further divided into two types, including low-speed Mass Machine Communication (MMC) and low-latency reliable Machine Communication. For the low-speed mass machine communication, mass nodes are accessed at a low speed, the transmitted data packets are usually small, the interval time is relatively long, and the cost and the power consumption of the nodes are usually low; for machine communication with low time delay and high reliability, the method is mainly used for machine communication with higher requirements on instantaneity and reliability, such as real-time alarm, real-time monitoring and the like.
In a fifth generation mobile communication system, one problem to be solved is the efficient and reliable transmission of data in the industrial internet of things scene, and a common solution can seriously reduce the network performance under the condition of low channel estimation accuracy.
Based on the analysis, the invention provides a data transmission method in an industrial internet of things.
Disclosure of Invention
The invention mainly aims to provide a data transmission method in an industrial Internet of things, and aims to improve the data transmission reliability and efficiency in the industrial Internet of things.
In order to achieve the above object, the present invention provides a data transmission method in an industrial internet of things, including the following steps:
a second communication node receives a downlink channel state information reference signal and a positioning reference signal sent by a first communication node, generates first channel state information based on the downlink channel state information reference signal, generates positioning reference signal arrival time information and arrival angle information based on the positioning reference signal, and feeds back the first channel state information, the positioning reference signal arrival time information and the arrival angle information to the first communication node, wherein the first channel state information at least comprises one of low reliability channel state information, medium reliability channel state information and high reliability channel state information;
the first communication node receiving the first channel state information, the positioning reference signal arrival time information and the arrival angle information;
the first communication node sends uplink sounding reference signal configuration information, wherein the uplink sounding reference signal configuration information at least comprises sending power configuration information of uplink sounding reference signals sent by the second communication node; when the first channel state information is low-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by the maximum sending power; when the first channel state information is medium reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by using 0.75 times of the maximum sending power; when the first channel state information is high-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by using 0.5 times of the maximum sending power;
the first communication node estimates a possible position of the second communication node according to the positioning reference signal arrival time and arrival angle information, and activates X third communication nodes closest to the possible position, wherein a value of X is determined according to the first channel state information, when the first channel state information is low-reliability channel state information, the value of X is 3, when the first channel state information is medium-reliability channel state information, the value of X is 2, and when the first channel state information is high-reliability channel state information, the value of X is 1;
after receiving the uplink sounding reference signal configuration information, the two-way node sends the uplink sounding reference signal according to the uplink sounding reference signal configuration information;
the first communication node receives the uplink sounding reference signal and determines second channel state information according to the receiving quality of the uplink sounding reference signal, wherein the second channel state information at least comprises one of low reliability channel state information, medium reliability channel state information and high reliability channel state information;
the first communication node modulates N data bits by adopting a preset modulation mode, wherein the modulation mode is determined according to the following criteria:
a. if the first channel state information and the second channel state information are both low-reliability channel state information, the first N/3 data bits use a BPSK modulation mode, the middle N/3 data bits use a QPSK modulation mode, and the last N/3 data bits use a 16QAM modulation mode;
b. if the first channel state information is low-reliability channel state information and the second channel state information is medium-reliability channel state information, the first N/4 data bits use a BPSK modulation mode, the middle N/4 data bits use a QPSK modulation mode, and the last N/2 data bits use a 16QAM modulation mode;
c. if the first channel state information is low-reliability channel state information and the second channel state information is high-reliability channel state information, the first N/4 data bits use a BPSK modulation mode, and the last 3N/4 data bits use a 16QAM modulation mode;
d. if the first channel state information is medium-reliability channel state information and the second channel state information is low-reliability channel state information, the first N/3 data bits use a QPSK modulation mode, the middle N/3 data bits use a 16QAM modulation mode, and the last N/3 data bits use a 64QAM modulation mode;
e. if the first channel state information and the second channel state information are both medium-reliability channel state information, the first N/4 data bits use a QPSK modulation mode, the middle N/4 data bits use a 16QAM modulation mode, and the last N/2 data bits use a 64QAM modulation mode;
f. if the first channel state information is medium-reliability channel state information and the second channel state information is high-reliability channel state information, the first N/4 data bits use a 16QAM modulation mode, and the last 3N/4 data bits use a 64QAM modulation mode;
g. if the first channel state information is high-reliability channel state information, the N data bits use a 64QAM modulation mode, wherein N is an integer which is positive integral times of 72, and the N data bits comprise a used bit and a cyclic redundancy check bit;
the first communication node shares a plurality of modulation symbols obtained after modulation to the X third communication nodes;
the first communication node and the X third communication nodes use the same time-frequency resource to send the modulation symbols to the second communication node;
the second communication node receives the plurality of modulation symbols, if the processed N data bits pass the check, feedback information containing successful receiving information is generated to the first communication node, and if the processed N data bits fail the check, feedback information containing failed receiving information is generated to the first communication node;
the first communication node receives the feedback information, if the feedback information contains reception failure information, the first communication node determines a fourth communication node closest to the second communication node except the X third communication nodes based on the arrival time and arrival angle information of the positioning reference signal fed back by the second communication node, the first communication node shares last N/2 data bits of the N data bits with the fourth communication node, the first communication node and the X third communication nodes modulate the first N/2 or N data bits and then resend the modulated data bits to the second communication node, and the fourth communication node resends the modulated last N/2 data bits to the second communication node.
A further technical solution of the present invention is that, before the second communication node feeds back the first channel state information, the second communication node negotiates with the first communication node through signaling a generation manner of the first channel state information, and when a signal to interference plus noise ratio of the downlink channel state information reference signal received by the second communication node is less than or equal to 8dB, the first channel state information includes low reliability channel state information; when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is greater than 8dB and less than or equal to 15dB, the first channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is greater than 15dB, the first channel state information comprises high-reliability channel state information.
A further technical solution of the present invention is that, when the first channel state information is low reliability channel state information, the transmission power configuration information requires the second communication node to repeat transmitting the uplink sounding reference signal eight times in a time domain; when the first channel state information is medium reliability channel state information, the transmission power configuration information requires the second communication node to repeat transmitting the uplink sounding reference signal four times in a time domain; and when the first channel state information is high-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal repeatedly twice in a time domain.
A further technical solution of the present invention is that, when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is less than or equal to 8dB, the second channel state information includes low reliability channel state information; when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is greater than 8dB and less than or equal to 15dB, the second channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is greater than 15dB, the second channel state information comprises a high-reliability channel state information.
A further technical solution of the present invention is that, when the feedback information received by the first communication node includes reception failure information and the first channel state information is low reliability channel state information, the first communication node performs BPSK modulation on the N data bits, the first communication node shares a plurality of modulation symbols to the X third communication nodes, and the first communication node and the third communication node use the same time-frequency resource to send the plurality of modulation symbols to the second communication node; and the fourth communication node performs BPSK modulation on the last N/2 data bits, and sends a plurality of BPSK symbols obtained after modulation to the second communication node.
A further technical solution of the present invention is that, when the feedback information received by the first communication node includes reception failure information and the first channel state information is medium reliability channel state information, the first communication node performs BPSK modulation on the first N/2 bits of the N data bits and performs QPSK modulation on the last N/2 bits, the first communication node shares a plurality of modulation symbols to the X third communication nodes, and the first communication node and the third communication node transmit the plurality of modulation symbols to the second communication node using the same time-frequency resource; and the fourth communication node performs 16QAM modulation on the last N/2 data bits and sends a plurality of 16QAM symbols obtained after modulation to the second communication node.
A further technical solution of the present invention is that, when the feedback information received by the first communication node includes reception failure information and the first channel state information is high-reliability channel state information, the first communication node performs QPSK modulation on the first N/2 data bits of the N data bits and performs 16QAM modulation on the last N/2 data bits, the first communication node shares a plurality of modulation symbols to the X third communication nodes, and the first communication node and the third communication nodes use the same time-frequency resources to send the plurality of modulation symbols to the second communication node; and the fourth communication node performs 64QAM modulation on the last N/2 data bits and sends a plurality of 64QAM symbols obtained after modulation to the second communication node.
A further technical solution of the present invention is that the first communication node transmits only the downlink channel state information reference signal in a time domain where the downlink channel state information reference signal is located.
A further technical solution of the present invention is that, when the first channel state information is high-reliability channel state information, the second communication node transmits only the uplink sounding reference signal in a time domain where the uplink sounding reference signal is located.
A further technical solution of the present invention is that, when the first channel state information is high reliability channel state information, the number of resources occupied by the demodulation reference signal used by the first communication node when the first communication node transmits the N data bits is X subcarriers, when the first channel state information is medium reliability channel state information, the number of resources occupied by the demodulation reference signal used by the first communication node when the first communication node transmits the N data bits is Y subcarriers, when the first channel state information is low reliability channel state information, the number of resources occupied by the demodulation reference signal used by the first communication node when the first communication node transmits the N data bits is Z subcarriers, wherein X, Y, Z is a positive integer, X is greater than or equal to two times Y, y is 2 times or more of Z.
The data transmission method in the industrial Internet of things has the advantages that by means of the technical scheme, the problem of data transmission reliability in the existing industrial Internet of things can be solved, and reliability and efficiency of data channel transmission are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a data transmission method in the industrial internet of things according to a first embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a data transmission method in an industrial internet of things, and a first embodiment of the data transmission method in the industrial internet of things of the present invention includes the following steps:
step S10, a second communication node receives a downlink channel state information reference signal and a positioning reference signal sent by a first communication node, generates first channel state information based on the downlink channel state information reference signal, generates positioning reference signal arrival time information and arrival angle information based on the positioning reference signal, and feeds back the first channel state information, the positioning reference signal arrival time information, and the arrival angle information to the first communication node, where the first channel state information at least includes one of low reliability channel state information, medium reliability channel state information, and high reliability channel state information.
In this embodiment, the first communication node may be, for example, a base station, the second communication node may be, for example, a terminal, and the third communication node may be, for example, a micro base station, and the terminal, the base station, and the micro base station are taken as examples to explain the present invention.
In this embodiment, a terminal receives a downlink channel state information reference signal and a positioning reference signal sent by a base station, generates first channel state information based on the downlink channel state information reference signal, generates positioning reference signal arrival time information and arrival angle information based on the positioning reference signal, and feeds back the first channel state information, the positioning reference signal arrival time information, and the arrival angle information to the base station. The advantage of dividing the channel state information is that the uplink feedback overhead is reduced under the condition of fully considering the actual wireless channel environment, and the uplink spectrum efficiency of the mobile communication system is improved. The advantage of feeding back the positioning related information is that the base station can determine to activate the micro base station near the terminal to cooperate with the base station to perform data retransmission to the terminal according to the position of the terminal, so as to improve the reliability of data transmission.
Step S20, the first communication node receives the first channel state information, the positioning reference signal time of arrival information and the angle of arrival information.
The base station receives the first channel state information, the positioning reference signal arrival time information and the arrival angle information
Step S30, the first communication node sends uplink sounding reference signal configuration information, where the uplink sounding reference signal configuration information at least includes transmission power configuration information of the second communication node sending an uplink sounding reference signal; when the first channel state information is low-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by the maximum sending power; when the first channel state information is medium reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by using 0.75 times of the maximum sending power; when the first channel state information is high-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by using 0.5 times of the maximum sending power.
In this embodiment, a base station sends uplink sounding reference signal configuration information, where the uplink sounding reference signal configuration information at least includes sending power configuration information of an uplink sounding reference signal sent by a terminal; when the first channel state information is low-reliability channel state information, the sending power configuration information requires a terminal to send the uplink sounding reference signal with the maximum sending power; when the first channel state information is medium reliability channel state information, the sending power configuration information requires the terminal to send the uplink sounding reference signal by using 0.75 time of the maximum sending power; and when the first channel state information is high-reliability channel state information, the sending power configuration information requires the terminal to send the uplink sounding reference signal by using 0.5 time of the maximum sending power. The reason for this is that there is reciprocity in the uplink and downlink channels of the TDD mobile communication system, and the base station can determine the transmission power of the uplink signal according to the downlink feedback condition, so as to avoid that the uplink signal reception quality caused by the uplink coverage problem cannot meet the communication requirement.
Step S40, the first communication node estimates a possible position of the second communication node according to the positioning reference signal arrival time and arrival angle information, and activates X third communication nodes closest to the possible position, where a value of X is determined according to the first channel state information, and when the first channel state information is low-reliability channel state information, the value of X is 3, when the first channel state information is medium-reliability channel state information, the value of X is 2, and when the first channel state information is high-reliability channel state information, the value of X is 1.
In this embodiment, a base station estimates a possible position of a terminal according to the positioning reference signal arrival time and the arrival angle information, and activates X micro base stations closest to the possible position, where a value of X is determined according to the first channel state information, when the first channel state information is low-reliability channel state information, the value of X is 3, when the first channel state information is medium-reliability channel state information, the value of X is 2, and when the first channel state information is high-reliability channel state information, the value of X is 1. The advantage of this embodiment is that the base station determines the number of micro base stations that need to cooperate with the base station to perform downlink data transmission according to the downlink channel state information between the base station and the terminal, thereby improving the probability of successfully receiving downlink data by the terminal.
Step S50, after receiving the uplink sounding reference signal configuration information, the second communications node sends the uplink sounding reference signal according to the uplink sounding reference signal configuration information.
And after receiving the uplink sounding reference signal configuration information, the terminal sends the uplink sounding reference signal according to the uplink sounding reference signal configuration information.
Step S60, the first communication node receives the uplink sounding reference signal, and determines second channel state information according to the reception quality of the uplink sounding reference signal, where the second channel state information at least includes one of low reliability channel state information, medium reliability channel state information, and high reliability channel state information.
In this embodiment, the base station receives the uplink sounding reference signal, and determines the second channel state information according to the reception quality of the uplink sounding reference signal, which is because the TDD mobile communication system has channel reciprocity in uplink and downlink, but uplink and downlink interference does not have reciprocity, thereby causing a problem that the uplink and downlink channel state information is inconsistent.
And step S70, the first communication node modulates the N data bits in a preset modulation mode.
The base station modulates the N data bits by adopting a preset modulation mode, wherein the modulation mode is determined according to the following criteria:
a. and if the first channel state information and the second channel state information are both low-reliability channel state information, the first N/3 data bits use a BPSK modulation mode, the middle N/3 data bits use a QPSK modulation mode, and the last N/3 data bits use a 16QAM modulation mode.
In this embodiment, the quality of the wireless channel between the base station and the terminal is poor, so that it is necessary to use a relatively large number of low-order modulation schemes to ensure the reliability of transmission.
b. If the first channel state information is low-reliability channel state information and the second channel state information is medium-reliability channel state information, the first N/4 data bits use a BPSK modulation mode, the middle N/4 data bits use a QPSK modulation mode, and the last N/2 data bits use a 16QAM modulation mode.
In this embodiment, it is considered that at this time, a downlink channel between the base station and the terminal has relatively strong interference, which results in relatively high downlink SINR, but the analysis of the downlink SNR from the second channel state information is better, so that the use of the low-order modulation scheme may be reduced.
c. And if the first channel state information is low-reliability channel state information and the second channel state information is high-reliability channel state information, the first N/4 data bits use a BPSK modulation mode, and the last 3N/4 data bits use a 16QAM modulation mode.
In this embodiment, it is considered that, at this time, a downlink channel of the base station and the terminal has relatively strong interference, which results in a relatively high downlink SINR, but the downlink SNR is very well analyzed from the second channel state information, so that the use of the low-order modulation scheme can be further reduced.
d. If the first channel state information is medium-reliability channel state information and the second channel state information is low-reliability channel state information, the first N/3 data bits use a QPSK modulation mode, the middle N/3 data bits use a 16QAM modulation mode, and the last N/3 data bits use a 64QAM modulation mode.
The scheme adopted by the embodiment considers that the downlink channel of the base station and the terminal is better at this time, so that the BPSK low order modulation mode can not be applied.
e. If the first channel state information and the second channel state information are both medium reliability channel state information, the first N/4 data bits use a QPSK modulation mode, the middle N/4 data bits use a 16QAM modulation mode, and the last N/2 data bits use a 64QAM modulation mode.
The scheme adopted by the embodiment considers that the downlink channel and the uplink channel of the base station and the terminal are better at the moment, so that the reliability of the better information of the downlink channel is proved to be very high, and more data bits can use a 64QAM modulation mode.
f. And if the first channel state information is medium-reliability channel state information and the second channel state information is high-reliability channel state information, the first N/4 data bits use a 16QAM modulation mode, and the last 3N/4 data bits use a 64QAM modulation mode.
The scheme adopted by the embodiment considers that the downlink channel of the base station and the terminal is better and the uplink channel is better at the moment, so that the fact that the downlink channel has interference is proved, and the interference terminal sides adopt an optimized receiver algorithm to eliminate the interference, so that more data bits can use a 64QAM modulation mode.
g. And if the first channel state information is high-reliability channel state information, using a 64QAM modulation mode for the N data bits, wherein N is an integer which is positive integral times of 72, and the N data bits comprise a used bit and a cyclic redundancy check bit.
In this embodiment, it is considered that the downlink channel is very good in this case, and the N data bits can be modulated by directly using the 64QAM modulation scheme without considering the uplink channel.
Step S80, the first communication node shares the plurality of modulated symbols obtained after modulation to the X third communication nodes.
And the base station shares a plurality of modulated symbols obtained after modulation to the X micro base stations.
Step S90, the first communication node and the X third communication nodes use the same time-frequency resource to send the multiple modulation symbols to the second communication node.
And the base station and the X micro base stations use the same time-frequency resource to send the modulation symbols to a terminal.
Step S100, the second communication node receives the multiple modulation symbols, and if the processed N data bits pass verification, generates feedback information including reception success information to the first communication node, and if the processed N data bits fail verification, generates feedback information including reception failure information to the first communication node.
And the terminal receives the plurality of modulation symbols, if the check of the N processed data bits is passed, the feedback information containing the successful receiving information is generated to the base station, and if the check of the N processed data bits is not passed, the feedback information containing the failed receiving information is generated to the base station.
Step S110, the first communication node receives the feedback information, if the feedback information includes reception failure information, the first communication node determines, based on the arrival time and the arrival angle information of the positioning reference signal fed back by the second communication node, a fourth communication node closest to the second communication node except the X third communication nodes, the first communication node shares last N/2 data bits of the N data bits with the fourth communication node, the first communication node and the X third communication nodes modulate the first N/2 or N data bits and then resend the modulated data bits to the second communication node, and the fourth communication node resends the modulated data bits to the second communication node.
In this embodiment, the fourth communication node is a micro base station (may also be referred to as a fourth base station) closest to the terminal except for the X micro base stations.
The base station receives the feedback information, if the feedback information contains reception failure information, the base station determines a micro base station (also called as a fourth base station) which is closest to the terminal except the X micro base stations based on the arrival time and the arrival angle information of the positioning reference signal fed back by the terminal, the base station shares the last N/2 data bits of the N data bits with the fourth base station, the base station and the X micro base stations modulate the first N/2 or N data bits and then send the modulated data bits to the terminal again, and the fourth base station modulates the last N/2 data bits and then sends the modulated data bits to the terminal again. It should be noted that the modulation scheme used in the retransmission of N data bits needs to be adjusted, so as to appropriately reduce the order of the modulation scheme and improve the reliability of data transmission.
It should be noted that, in this embodiment, the first communication node only transmits the downlink channel state information reference signal in the time domain where the downlink channel state information reference signal is located. The advantage of this is that the terminal can transmit the downlink sounding reference signal by concentrating all downlink power, thereby improving the estimation accuracy of the base station on the downlink channel.
And when the first channel state information is high-reliability channel state information, the second communication node only transmits the uplink sounding reference signal in the time domain where the uplink sounding reference signal is located. The advantage of this is that the terminal can transmit the uplink sounding reference signal by concentrating all uplink powers, thereby improving the estimation accuracy of the base station for the uplink channel.
Through the technical scheme, compared with the prior art, the data transmission reliability problem in the existing industrial Internet of things can be solved, and the reliability and the efficiency of data channel transmission are improved.
Based on the first embodiment shown in fig. 1, a second embodiment of the data transmission method in the industrial internet of things is provided, where this embodiment is different from the first embodiment shown in fig. 1 in that before the second communication node feeds back the first channel state information, the second communication node negotiates, through signaling, a generation manner of the first channel state information with the first communication node, and when a signal to interference plus noise ratio of the downlink channel state information reference signal received by the second communication node is less than or equal to 8dB, the first channel state information includes low reliability channel state information; when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is greater than 8dB and less than or equal to 15dB, the first channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is greater than 15dB, the first channel state information comprises high-reliability channel state information.
Taking the terminal and the base station as examples, before the terminal feeds back the first channel state information, the terminal and the base station negotiate a generation mode of the first channel state information through signaling, and when a signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the terminal is less than or equal to 8dB, the first channel state information includes low-reliability channel state information; when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the terminal is greater than 8dB and less than or equal to 15dB, the first channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the terminal is greater than 15dB, the first channel state information comprises high-reliability channel state information.
The beneficial effect of the present embodiment through the above technical solution is that the base station and the terminal can adjust the intervals of different reliability channel state information according to the actual situation of the wireless channel, thereby better adapting to the change of the wireless channel environment.
Based on the first embodiment shown in fig. 1, a third embodiment of the data transmission method in the industrial internet of things is provided, and the difference between this embodiment and the first embodiment shown in fig. 1 is that when the first channel state information is low-reliability channel state information, the transmission power configuration information requires the second communication node to repeatedly transmit the uplink sounding reference signal eight times in a time domain; when the first channel state information is medium reliability channel state information, the transmission power configuration information requires the second communication node to repeat transmitting the uplink sounding reference signal four times in a time domain; and when the first channel state information is high-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal repeatedly twice in a time domain.
Taking the terminal and the base station as examples, when the first channel state information is low-reliability channel state information, the transmit power configuration information requires the terminal to repeat transmitting the uplink sounding reference signal eight times in the time domain; when the first channel state information is medium reliability channel state information, the transmission power configuration information requires the terminal to repeatedly transmit the uplink sounding reference signal four times in a time domain; and when the first channel state information is high-reliability channel state information, the transmission power configuration information requires the terminal to repeatedly transmit the uplink sounding reference signal twice in the time domain.
According to the technical scheme, the transmission quality of the uplink sounding reference signal is improved as much as possible by utilizing the reciprocity of the uplink and the downlink of the channel, and the base station is ensured to obtain more accurate judgment on the state information of the downlink channel.
Based on the first embodiment shown in fig. 1, a fourth embodiment of the data transmission method in the industrial internet of things is proposed, and the difference between this embodiment and the first embodiment shown in fig. 1 is that when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is less than or equal to 8dB, the second channel state information includes low-reliability channel state information; when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is greater than 8dB and less than or equal to 15dB, the second channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is greater than 15dB, the second channel state information comprises a high-reliability channel state information.
Taking the terminal and the base station as examples, when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the base station is less than or equal to 8dB, the second channel state information includes low-reliability channel state information; when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the base station is greater than 8dB and less than or equal to 15dB, the second channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the base station is greater than 15dB, the second channel state information comprises a high-reliability channel state information.
The technical scheme adopted by the embodiment has the beneficial effects that the base station and the terminal can adjust the intervals of the channel state information with different reliabilities according to the actual condition of the wireless channel, thereby better adapting to the change of the wireless channel environment.
Based on the first embodiment shown in fig. 1, a fifth embodiment of the data transmission method in the industrial internet of things is provided, where this embodiment is different from the first embodiment shown in fig. 1 in that when the feedback information received by the first communication node includes reception failure information and the first channel state information is low-reliability channel state information, the first communication node performs BPSK modulation on the N data bits, the first communication node shares a plurality of modulation symbols with the X third communication nodes, and the first communication node and the third communication node use the same time-frequency resource to send the plurality of modulation symbols to the second communication node; and the fourth communication node performs BPSK modulation on the last N/2 data bits, and sends a plurality of BPSK symbols obtained after modulation to the second communication node.
Taking the terminal and the base station as an example, when the feedback information received by the base station includes reception failure information and the first channel state information is low-reliability channel state information, the base station performs BPSK modulation on the N data bits, the base station shares a plurality of modulation symbols with the X micro base stations, and the base station and the micro base stations use the same time-frequency resource to transmit the plurality of modulation symbols to the terminal; and the fourth base station carries out BPSK modulation on the last N/2 data bits and sends a plurality of BPSK symbols obtained after modulation to the terminal.
The technical scheme adopted by the embodiment has the beneficial effects that the probability of successful reception of the terminal is improved by using a BPSK modulation mode for all data bits and transmitting part of the data bits through the micro base station which is closer to the terminal.
Based on the first embodiment shown in fig. 1, a sixth embodiment of the data transmission method in the industrial internet of things is provided, where this embodiment is different from the first embodiment shown in fig. 1 in that when the feedback information received by the first communication node includes reception failure information and the first channel state information is medium reliability channel state information, the first communication node performs BPSK modulation on first N/2 bits of the N data bits and performs QPSK modulation on last N/2 bits, the first communication node shares multiple modulation symbols to the X third communication nodes, and the first communication node and the third communication node use the same time-frequency resource to send the multiple modulation symbols to the second communication node; and the fourth communication node performs 16QAM modulation on the last N/2 data bits and sends a plurality of 16QAM symbols obtained after modulation to the second communication node.
Taking the terminal and the base station as an example, when the feedback information received by the base station includes reception failure information and the first channel state information is medium-reliability channel state information, the base station performs BPSK modulation on the first N/2 bits of the N data bits and performs QPSK modulation on the last N/2 bits, the base station shares a plurality of modulation symbols to the X micro base stations, and the base station and the micro base stations use the same time-frequency resource to transmit the plurality of modulation symbols to the terminal; and the fourth base station performs 16QAM modulation on the last N/2 data bits and sends a plurality of 16QAM symbols obtained after modulation to the terminal.
The technical scheme adopted by the embodiment has the beneficial effects that compared with the modulation mode used for the first transmission, the retransmitted data bits use more low-order modulation modes, and the probability of successful reception of the terminal is improved.
Based on the first embodiment shown in fig. 1, a seventh embodiment of the data transmission method in the industrial internet of things is provided, where this embodiment is different from the first embodiment shown in fig. 1 in that when the feedback information received by the first communication node includes reception failure information and the first channel state information is high-reliability channel state information, the first communication node performs QPSK modulation on first N/2 data bits of the N data bits and performs 16QAM modulation on last N/2 bits, the first communication node shares multiple modulation symbols to the X third communication nodes, and the first communication node and the third communication nodes use the same time-frequency resource to send the multiple modulation symbols to the second communication node; and the fourth communication node performs 64QAM modulation on the last N/2 data bits and sends a plurality of 64QAM symbols obtained after modulation to the second communication node.
Taking the terminal and the base station as an example, when the feedback information received by the base station includes reception failure information and the first channel state information is high-reliability channel state information, the base station performs QPSK modulation on the first N/2 data bits of the N data bits and performs 16QAM modulation on the last N/2 data bits, the base station shares a plurality of modulation symbols with the X micro base stations, and the base station and the micro base stations use the same time-frequency resource to transmit the plurality of modulation symbols to the terminal; and the fourth base station carries out 64QAM modulation on the last N/2 data bits and sends a plurality of 64QAM symbols obtained after modulation to the terminal.
Through the technical scheme, compared with the modulation mode used for the first transmission, the retransmission data bit uses more low-order modulation modes, and the probability of successful reception of the terminal is improved.
Based on the first embodiment shown in fig. 1, a seventh embodiment of the data transmission method in the industrial internet of things is provided, and this embodiment is different from the first embodiment shown in fig. 1 in that when the first channel state information is high reliability channel state information, and the first communication node sends the N data bits, the number of resources occupied by the demodulation reference signal used by the first communication node is X subcarriers, when the first channel state information is medium reliability channel state information, and the first communication node sends the N data bits, the number of resources occupied by the demodulation reference signal used by the first communication node is Y subcarriers, and when the first channel state information is low reliability channel state information, and the first communication node sends the N data bits, the number of resources occupied by the demodulation reference signal used by the first communication node is Z subcarriers, wherein X, Y, Z is a positive integer, X is twice as large as Y, and Y is 2 times as large as Z.
Taking the terminal and the base station as examples, when the first channel state information is high reliability channel state information, the number of resources occupied by the demodulation reference signal used by the base station when the base station transmits the N data bits is X subcarriers, when the first channel state information is medium reliability channel state information, the number of resources occupied by the demodulation reference signal used by the base station when the base station transmits the N data bits is Y subcarriers, when the first channel state information is low reliability channel state information, the number of resources occupied by the demodulation reference signal used by the base station when the base station transmits the N data bits is Z subcarriers, wherein X, Y, Z is a positive integer, X is two times or more than Y, and Y is 2 times or more than Z.
The advantage of the technical solution adopted in this embodiment is that when the downlink channel quality is relatively good, fewer time-frequency resources are used to transmit the demodulation reference signal, thereby reducing the control overhead of the system, and when the downlink channel quality is relatively poor, more time-frequency resources are used to transmit the demodulation reference signal, thereby improving the accuracy of channel estimation and improving the probability of successful data bit decoding.
The data transmission method in the industrial Internet of things has the advantages that by means of the technical scheme, the problem of data transmission reliability in the existing industrial Internet of things can be solved, and reliability and efficiency of data channel transmission are improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A data transmission method in an industrial Internet of things is characterized by comprising the following steps:
a second communication node receives a downlink channel state information reference signal and a positioning reference signal sent by a first communication node, generates first channel state information based on the downlink channel state information reference signal, generates positioning reference signal arrival time information and arrival angle information based on the positioning reference signal, and feeds back the first channel state information, the positioning reference signal arrival time information and the arrival angle information to the first communication node, wherein the first channel state information at least comprises one of low reliability channel state information, medium reliability channel state information and high reliability channel state information;
the first communication node receiving the first channel state information, the positioning reference signal arrival time information and the arrival angle information;
the first communication node sends uplink sounding reference signal configuration information, wherein the uplink sounding reference signal configuration information at least comprises sending power configuration information of uplink sounding reference signals sent by the second communication node; when the first channel state information is low-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by the maximum sending power; when the first channel state information is medium reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by using 0.75 times of the maximum sending power; when the first channel state information is high-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal by using 0.5 times of the maximum sending power;
the first communication node estimates a possible position of the second communication node according to the positioning reference signal arrival time and arrival angle information, and activates X third communication nodes closest to the possible position, wherein a value of X is determined according to the first channel state information, when the first channel state information is low-reliability channel state information, the value of X is 3, when the first channel state information is medium-reliability channel state information, the value of X is 2, and when the first channel state information is high-reliability channel state information, the value of X is 1;
after receiving the uplink sounding reference signal configuration information, the two-way node sends the uplink sounding reference signal according to the uplink sounding reference signal configuration information;
the first communication node receives the uplink sounding reference signal and determines second channel state information according to the receiving quality of the uplink sounding reference signal, wherein the second channel state information at least comprises one of low reliability channel state information, medium reliability channel state information and high reliability channel state information;
the first communication node modulates N data bits by adopting a preset modulation mode, wherein the modulation mode is determined according to the following criteria:
a. if the first channel state information and the second channel state information are both low-reliability channel state information, the first N/3 data bits use a BPSK modulation mode, the middle N/3 data bits use a QPSK modulation mode, and the last N/3 data bits use a 16QAM modulation mode;
b. if the first channel state information is low-reliability channel state information and the second channel state information is medium-reliability channel state information, the first N/4 data bits use a BPSK modulation mode, the middle N/4 data bits use a QPSK modulation mode, and the last N/2 data bits use a 16QAM modulation mode;
c. if the first channel state information is low-reliability channel state information and the second channel state information is high-reliability channel state information, the first N/4 data bits use a BPSK modulation mode, and the last 3N/4 data bits use a 16QAM modulation mode;
d. if the first channel state information is medium-reliability channel state information and the second channel state information is low-reliability channel state information, the first N/3 data bits use a QPSK modulation mode, the middle N/3 data bits use a 16QAM modulation mode, and the last N/3 data bits use a 64QAM modulation mode;
e. if the first channel state information and the second channel state information are both medium-reliability channel state information, the first N/4 data bits use a QPSK modulation mode, the middle N/4 data bits use a 16QAM modulation mode, and the last N/2 data bits use a 64QAM modulation mode;
f. if the first channel state information is medium-reliability channel state information and the second channel state information is high-reliability channel state information, the first N/4 data bits use a 16QAM modulation mode, and the last 3N/4 data bits use a 64QAM modulation mode;
g. if the first channel state information is high-reliability channel state information, the N data bits use a 64QAM modulation mode, wherein N is an integer which is positive integral times of 72, and the N data bits comprise a used bit and a cyclic redundancy check bit;
the first communication node shares a plurality of modulation symbols obtained after modulation to the X third communication nodes;
the first communication node and the X third communication nodes use the same time-frequency resource to send the modulation symbols to the second communication node;
the second communication node receives the plurality of modulation symbols, if the processed N data bits pass the check, feedback information containing successful receiving information is generated to the first communication node, and if the processed N data bits fail the check, feedback information containing failed receiving information is generated to the first communication node;
the first communication node receives the feedback information, if the feedback information contains reception failure information, the first communication node determines a fourth communication node closest to the second communication node except the X third communication nodes based on the arrival time and arrival angle information of the positioning reference signal fed back by the second communication node, the first communication node shares last N/2 data bits of the N data bits with the fourth communication node, the first communication node and the X third communication nodes modulate the first N/2 or N data bits and then resend the modulated data bits to the second communication node, and the fourth communication node resends the modulated last N/2 data bits to the second communication node.
2. The data transmission method in the industrial internet of things according to claim 1, wherein before the second communication node feeds back the first channel state information, the second communication node negotiates with the first communication node about a generation manner of the first channel state information through signaling, and when a signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is less than or equal to 8dB, the first channel state information includes low reliability channel state information; when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is greater than 8dB and less than or equal to 15dB, the first channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the downlink channel state information reference signal received by the second communication node is greater than 15dB, the first channel state information comprises high-reliability channel state information.
3. The data transmission method in the industrial internet of things as claimed in claim 1, wherein when the first channel state information is low-reliability channel state information, the transmit power configuration information requires the second communication node to repeat transmitting the uplink sounding reference signal eight times in a time domain; when the first channel state information is medium reliability channel state information, the transmission power configuration information requires the second communication node to repeat transmitting the uplink sounding reference signal four times in a time domain; and when the first channel state information is high-reliability channel state information, the sending power configuration information requires the second communication node to send the uplink sounding reference signal repeatedly twice in a time domain.
4. The data transmission method in the industrial internet of things according to claim 1, wherein when the signal to interference and noise ratio of the uplink sounding reference signal received by the first communication node is less than or equal to 8dB, the second channel state information comprises low reliability channel state information; when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is greater than 8dB and less than or equal to 15dB, the second channel state information comprises medium reliability channel state information; and when the signal-to-interference-and-noise ratio of the uplink sounding reference signal received by the first communication node is greater than 15dB, the second channel state information comprises a high-reliability channel state information.
5. The data transmission method in the internet of things of industry according to claim 1, wherein when the feedback information received by the first communication node includes reception failure information and the first channel state information is low reliability channel state information, the first communication node BPSK modulates the N data bits, the first communication node shares a plurality of modulation symbols to the X third communication nodes, and the first communication node and the third communication node use the same time-frequency resource to transmit the plurality of modulation symbols to the second communication node; and the fourth communication node performs BPSK modulation on the last N/2 data bits, and sends a plurality of BPSK symbols obtained after modulation to the second communication node.
6. The data transmission method in the internet of things of industry according to claim 1, wherein when the feedback information received by the first communication node includes reception failure information and the first channel state information is medium reliability channel state information, the first communication node BPSK modulates the first N/2 bits of the N data bits and QPSK modulates the last N/2 bits, the first communication node shares a plurality of modulation symbols to the X third communication nodes, and the first communication node and the third communication node transmit the plurality of modulation symbols to the second communication node using the same time-frequency resource; and the fourth communication node performs 16QAM modulation on the last N/2 data bits and sends a plurality of 16QAM symbols obtained after modulation to the second communication node.
7. The data transmission method in the internet of things of industry according to claim 1, wherein when the feedback information received by the first communication node includes reception failure information and the first channel state information is high reliability channel state information, the first communication node performs QPSK modulation on the first N/2 data bits of the N data bits and performs 16QAM modulation on the last N/2 bits, the first communication node shares a plurality of modulation symbols to the X third communication nodes, and the first communication node and the third communication node transmit the plurality of modulation symbols to the second communication node using the same time-frequency resource; and the fourth communication node performs 64QAM modulation on the last N/2 data bits and sends a plurality of 64QAM symbols obtained after modulation to the second communication node.
8. The data transmission method in the industrial internet of things as claimed in claim 1, wherein the first communication node transmits only the downlink channel state information reference signal in a time domain where the downlink channel state information reference signal is located.
9. The data transmission method in the industrial internet of things as claimed in claim 1, wherein when the first channel state information is high-reliability channel state information, the second communication node transmits only the uplink sounding reference signal in a time domain where the uplink sounding reference signal is located.
10. The data transmission method in the industrial internet of things as claimed in claim 1, wherein when the first channel state information is high reliability channel state information, the first communication node transmits the N data bits, the number of resources occupied by the demodulation reference signal used by the first communication node is X subcarriers, when the first communication node transmits the N data bits, the number of resources occupied by the demodulation reference signal used by the first communication node is Y subcarriers, when the first channel state information is medium reliability channel state information, the first communication node transmits the N data bits, and when the first channel state information is low reliability channel state information, the first communication node transmits the N data bits, the number of resources occupied by the demodulation reference signal used by the first communication node is Z subcarriers, wherein, x, Y, Z is a positive integer, X is twice as large as Y, and Y is 2 times as large as Z.
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