CN112004250A - Robust Internet of things data transmission method and system - Google Patents
Robust Internet of things data transmission method and system Download PDFInfo
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- CN112004250A CN112004250A CN202010864953.8A CN202010864953A CN112004250A CN 112004250 A CN112004250 A CN 112004250A CN 202010864953 A CN202010864953 A CN 202010864953A CN 112004250 A CN112004250 A CN 112004250A
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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
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
The invention discloses a robust Internet of things data transmission method and a robust Internet of things data transmission system, wherein the method comprises the steps that a first communication node receives F feedback information sent by a second communication node, if F2/F1 is larger than or equal to 0.2, or the first communication node receives information that the second communication node fails to feed back and receive a physical layer data bit sequence, the physical layer data bit sequence is divided into a first bit sequence and a second bit sequence by the first communication node; modulating the first and second bit sequences, uniformly extracting M1 subcarriers from M1+ M2 subcarriers which are continuous in time and frequency, mapping M1 modulation symbols to M1 subcarriers, and mapping M2 modulation symbols to the rest M2 subcarriers; and the second communication node receives the physical layer transmission unit block, performs demodulation and decoding operation, and sends feedback receiving success or receiving failure information to the first communication node according to a decoding result. The invention improves 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 robust Internet of things data transmission method and system.
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 video, virtual 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 gatherings, 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). Among these, the main technical requirements for mobile broadband access are high capacity, providing high data rates to meet the ever-increasing demand for data services. 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 high-reliability 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, reliable and low-power transmission of data in the scene of the internet of things, and particularly in the internet of things network using a narrow bandwidth, a common solution can cause the power consumption of a terminal to be large, thereby seriously reducing the performance of the network.
Disclosure of Invention
The invention mainly aims to provide a robust Internet of things data transmission method and system, so as to solve the problem of data transmission reliability in the existing Internet of things with narrow bandwidth, and improve the reliability and efficiency of data channel transmission.
In order to achieve the purpose, the invention provides a robust internet of things data transmission method, which comprises the following steps:
s10, the first communication node receives F feedback information sent by the second communication node, where F1 pieces of feedback information in the F feedback information indicate that the physical layer data bit sequence corresponding to the feedback information is successfully received, and F2 pieces of feedback information indicate that the physical layer data bit sequence corresponding to the feedback information is failed to be received, where F1+ F2 is F, F1 is an integer greater than or equal to 1, and F2 is an integer greater than or equal to 0;
s20, if F2/F1 is smaller than 0.2, the first communication node obtains X1 symbols from the physical layer data bit sequence with length S using the same modulation method, maps the X1 symbols to X1 subcarriers, and transmits demodulation reference signals using X1/2 subcarriers, where the X1 subcarriers and the X1/2 subcarriers form an initial physical layer transmission unit block, the first communication node repeatedly transmits the initial physical layer transmission unit block Z times to the second communication node in the time domain, and the process goes to step S100;
s30, if the F2/F1 is greater than or equal to 0.2, or the first communication node receives the failure information of the second communication node feedback receiving the physical layer data bit sequence with the length S, the first communication node divides the physical layer data bit sequence with the length S into a first bit sequence with the length S1 and a second bit sequence with the length S2, wherein the sum of S1 and S2 is S, S1 is an integer greater than or equal to 16, and the value of S2 is S1/alpha;
s40, the first communication node modulates the first bit sequence to obtain M1 modulation symbols, and each modulation symbol carries S1/M1 bits of information;
s50, the first communication node modulates the second bit sequence to obtain M2 modulation symbols, each modulation symbol carries S2/M2 bits of information, wherein S2/M2 is max (1, (S1/(beta × M1)));
s60, the first communication node uniformly extracting M1 subcarriers from M1+ M2 subcarriers which are continuous in time and frequency, mapping the M1 modulation symbols to the M1 subcarriers, and mapping the M2 modulation symbols to the rest M2 subcarriers;
s70, the first communication node carrying demodulation reference signals on D1 subcarriers on a time domain symbol located before a time region where the M1+ M2 subcarriers are located, the D1 subcarriers and the M1+ M2 subcarriers are called a first physical layer transmission unit block, where D1 is M1+ M2 × gamma/16;
s80, the first communication node carrying demodulation reference signals on D2 subcarriers located on time domain symbols after a time region where the M1+ M2 subcarriers are located, the D2 subcarriers and the (M1+ M2) subcarriers are referred to as a second physical layer transmission unit block, wherein a value of D2 is 1.5 × D1;
s90, the first communication node repeatedly transmits NI of the first blocks of physical layer transmission unit and N2 of the second blocks of physical layer transmission unit to the second communication node in time domain, where N1 is an integer greater than or equal to 16, and N2 bits are an integer smaller than N1 and greater than 1;
s100, the second communication node receives the initial physical layer transmission unit block or the first physical layer transmission unit block and the second physical layer transmission unit block, carries out demodulation and decoding operation, and sends feedback receiving success or receiving failure information to the first communication node according to a decoding result.
Wherein the physical layer data bit sequence comprises a cyclic redundancy check bit sequence, and the second communication node determines whether it successfully received the physical layer data bit sequence based on the cyclic redundancy check bit sequence.
When S1/M1 is greater than or equal to 4, the value of alpha is 8, and the value of beta is 4; when (S1/M1) is less than 4, the value of alpha is 4, and the value of beta is 2.
Wherein when S1/M1 is more than or equal to 4, the value of gamma is 2; when S1/M1 is less than 4, the value of gamma is 1.
When S1/M1 is greater than or equal to 4, the value of N2 is N1/16; when S1/M1 is smaller than 4, the value of N2 is N1/8.
When the S1/M1 is greater than or equal to 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the first physical layer transmission unit block is 3dB greater than that of the other sub-carriers, and when the S1/M1 is less than 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is equal to that of the other sub-carriers.
When the S1/M1 is greater than or equal to 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is greater than the transmission power of the other sub-carriers by 6dB, and when the S1/M1 is less than 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is greater than the transmission power of the other sub-carriers by 3 dB.
The second communication node performs hard demodulation on the M2 modulation symbols, and performs soft decoding on the M1 modulation symbols according to the channel information on the M2 subcarriers obtained after hard demodulation and the channel information estimated based on the demodulation reference signal.
When the S1/M1 is greater than or equal to 4, the transmission power used by the second communication node for feeding back the successful reception information is greater than the transmission power used for feeding back the failed reception information by 6 dB; when the S1/M1 is less than 4, the transmission power used by the second communication node for feeding back the reception success information is 3dB greater than the transmission power used for feeding back the reception failure information.
In addition, the present invention also provides a robust data transmission system of internet of things, which includes a memory, wherein the memory stores a computer program, and the computer program, when executed by a processor, implements the steps of the robust data transmission method of internet of things as described above.
Compared with the prior art, the robust data transmission method and system of the Internet of things provided by the embodiment of the invention overcome the problem of data transmission reliability in the existing Internet of things using narrow bandwidth, and improve the reliability and efficiency of data channel transmission.
Drawings
Fig. 1 is a schematic flow chart of a robust data transmission method of the internet of things according to the present invention;
FIG. 2 is a block diagram of a first physical layer transport unit according to the present invention;
fig. 3 is a block diagram of a second physical layer transport unit according to the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a robust Internet of things data transmission method, which comprises the following steps:
s10, the first communication node receives F feedback information sent by the second communication node, where F1 pieces of feedback information in the F feedback information indicate that the physical layer data bit sequence corresponding to the feedback information is successfully received, and F2 pieces of feedback information indicate that the physical layer data bit sequence corresponding to the feedback information is failed to be received, where F1+ F2 is F, F1 is an integer greater than or equal to 1, and F2 is an integer greater than or equal to 0;
s20, if F2/F1 is smaller than 0.2, the first communication node obtains X1 symbols from the physical layer data bit sequence with length S using the same modulation method, maps the X1 symbols to X1 subcarriers, and transmits demodulation reference signals using X1/2 subcarriers, where the X1 subcarriers and the X1/2 subcarriers form an initial physical layer transmission unit block, the first communication node repeatedly transmits the initial physical layer transmission unit block Z times to the second communication node in the time domain, and the process goes to step S100;
s30, if the F2/F1 is greater than or equal to 0.2, or the first communication node receives the failure information of the second communication node feedback receiving the physical layer data bit sequence with the length S, the first communication node divides the physical layer data bit sequence with the length S into a first bit sequence with the length S1 and a second bit sequence with the length S2, wherein the sum of S1 and S2 is S, S1 is an integer greater than or equal to 16, and the value of S2 is S1/alpha;
s40, the first communication node modulates the first bit sequence to obtain M1 modulation symbols, and each modulation symbol carries S1/M1 bits of information;
s50, the first communication node modulates the second bit sequence to obtain M2 modulation symbols, each modulation symbol carries S2/M2 bits of information, wherein S2/M2 is max (1, (S1/(beta × M1)));
s60, the first communication node uniformly extracting M1 subcarriers from M1+ M2 subcarriers which are continuous in time and frequency, mapping the M1 modulation symbols to the M1 subcarriers, and mapping the M2 modulation symbols to the rest M2 subcarriers;
s70, the first communication node carrying demodulation reference signals on D1 subcarriers on a time domain symbol located before a time region where the M1+ M2 subcarriers are located, the D1 subcarriers and the M1+ M2 subcarriers are called a first physical layer transmission unit block, where D1 is M1+ M2 × gamma/16;
s80, the first communication node carrying demodulation reference signals on D2 subcarriers located on time domain symbols after a time region where the M1+ M2 subcarriers are located, the D2 subcarriers and the (M1+ M2) subcarriers are referred to as a second physical layer transmission unit block, wherein a value of D2 is 1.5 × D1;
s90, the first communication node repeatedly transmits NI of the first blocks of physical layer transmission unit and N2 of the second blocks of physical layer transmission unit to the second communication node in time domain, where N1 is an integer greater than or equal to 16, and N2 bits are an integer smaller than N1 and greater than 1;
s100, the second communication node receives the initial physical layer transmission unit block or the first physical layer transmission unit block and the second physical layer transmission unit block, carries out demodulation and decoding operation, and sends feedback receiving success or receiving failure information to the first communication node according to a decoding result.
Wherein the physical layer data bit sequence comprises a cyclic redundancy check bit sequence, and the second communication node determines whether it successfully received the physical layer data bit sequence based on the cyclic redundancy check bit sequence.
When S1/M1 is greater than or equal to 4, the value of alpha is 8, and the value of beta is 4; when (S1/M1) is less than 4, the value of alpha is 4, and the value of beta is 2.
Wherein when S1/M1 is more than or equal to 4, the value of gamma is 2; when S1/M1 is less than 4, the value of gamma is 1.
When S1/M1 is greater than or equal to 4, the value of N2 is N1/16; when S1/M1 is smaller than 4, the value of N2 is N1/8.
When the S1/M1 is greater than or equal to 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the first physical layer transmission unit block is 3dB greater than that of the other sub-carriers, and when the S1/M1 is less than 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is equal to that of the other sub-carriers.
When the S1/M1 is greater than or equal to 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is greater than the transmission power of the other sub-carriers by 6dB, and when the S1/M1 is less than 4, the transmission power of the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is greater than the transmission power of the other sub-carriers by 3 dB.
The second communication node performs hard demodulation on the M2 modulation symbols, and performs soft decoding on the M1 modulation symbols according to the channel information on the M2 subcarriers obtained after hard demodulation and the channel information estimated based on the demodulation reference signal.
When the S1/M1 is greater than or equal to 4, the transmission power used by the second communication node for feeding back the successful reception information is greater than the transmission power used for feeding back the failed reception information by 6 dB; when the S1/M1 is less than 4, the transmission power used by the second communication node for feeding back the reception success information is 3dB greater than the transmission power used for feeding back the reception failure information.
In addition, the present invention also provides a robust data transmission system of internet of things, which includes a memory, wherein the memory stores a computer program, and the computer program, when executed by a processor, implements the steps of the robust data transmission method of internet of things as described above.
Compared with the prior art, the robust data transmission method and system of the Internet of things provided by the embodiment of the invention overcome the problem of data transmission reliability in the existing Internet of things using narrow bandwidth, and improve the reliability and efficiency of data channel transmission.
The following describes the implementation of the present technical solution in further detail with reference to fig. 1, fig. 2 and fig. 3, and the specific process of the present invention is as follows:
s102, a base station receives F feedback information sent by a terminal, wherein F1 feedback information in the F feedback information indicate that a corresponding physical layer data bit sequence is successfully received, F2 feedback information indicate that the corresponding physical layer data bit sequence is failed to be received, F1+ F2 is F, F1 is an integer greater than or equal to 1, and F2 is an integer greater than or equal to 0;
s104, if F2/F1 is smaller than 0.2, the base station uses the same modulation mode to obtain X1 symbols for the physical layer data bit sequence with the length of S, X1 symbols are mapped to X1 subcarriers, and X1/2 subcarriers are used for transmitting demodulation reference signals, the X1 subcarriers and the X1/2 subcarriers form an initial physical layer transmission unit block, the base station repeatedly sends the initial physical layer transmission unit block for Z times to the terminal in the time domain, and the step is shifted to step 120);
s106, if F2/F1 is greater than or equal to 0.2, or the base station receives information that the terminal fails to feed back and receive the physical layer data bit sequence with the length S, the base station divides the physical layer data bit sequence with the length S into a first bit sequence with the length S1 and a second bit sequence with the length S2, wherein the sum of S1 and S2 is S, S1 is an integer greater than or equal to 16, and the value of S2 is S1/alpha; s108, the base station modulates the first bit sequence to obtain M1 modulation symbols, wherein each modulation symbol carries (S1/M1) bit information;
s110, the base station modulates the second bit sequence to obtain M2 modulation symbols, wherein each modulation symbol carries (S2/M2) bit information, and the value of (S2/M2) is max (1, (S1/(beta M1)));
s112, the base station uniformly extracts M1 subcarriers from time-frequency continuous (M1+ M2) subcarriers, maps M1 modulation symbols to M1 subcarriers, and maps M2 modulation symbols to the rest M2 subcarriers;
s114, the base station carries demodulation reference signals on D1 subcarriers located on time domain symbols before a time region where (M1+ M2) subcarriers are located, where D1 subcarriers and (M1+ M2) subcarriers are called a first physical layer transmission unit block, and D1 is (M1+ M2) × gamma/16; s116, the base station carries demodulation reference signals on D2 subcarriers located on the time domain symbol after the time region where the (M1+ M2) subcarriers are located, the D2 subcarriers and the (M1+ M2) subcarriers are called second phy transport unit block, where the value of D2 is 1.5 × D1;
s118, the base station repeatedly sends N1 first physical layer transmission unit blocks and N2 second physical layer transmission unit blocks to the terminal in the time domain, wherein N1 is an integer larger than or equal to 16, and N2 bits are an integer smaller than N1 and larger than 1;
and S120, the terminal receives the first physical layer transmission unit block and the second physical layer transmission unit block, performs demodulation and decoding operation, and sends feedback receiving success or receiving failure information to the base station according to a decoding result.
Example 1
The base station receives F feedback information sent by the terminal, where F1 feedback information in the F feedback information indicates that the physical layer data bit sequence corresponding to the feedback information is successfully received, and F2 feedback information indicates that the physical layer data bit sequence corresponding to the feedback information is failed to be received, where F1+ F2 is F, F1 is an integer greater than or equal to 1, and F2 is an integer greater than or equal to 0. The purpose of this is that the base station can count up the link reliability information when the physical layer data transmission is carried out with the terminal before, thereby providing guidance for the subsequent transmission of the physical layer data bit sequence. If F2/F1 is smaller than 0.2, the base station uses the same modulation mode to obtain X1 symbols for the physical layer data bit sequence with the length of S, the X1 symbols are mapped to X1 subcarriers, X1/2 subcarriers are used for transmitting demodulation reference signals, X1 subcarriers and X1/2 subcarriers form an initial physical layer transmission unit block, the base station repeatedly sends the second initial physical layer transmission unit block to the terminal in the time domain, and the last step is carried out. This has the advantage that if the channel between the base station and the terminal is stable before, the base station can transmit the first transmission packet in a simple and repeated manner when subsequently transmitting a new physical layer data bit sequence.
If F2/F1 is greater than or equal to 0.2, or the base station receives information that the terminal fails to feed back and receive the physical layer data bit sequence with the length S, the base station divides the physical layer data bit sequence with the length S into a first bit sequence with the length S1 and a second bit sequence with the length S2, wherein the sum of S1 and S2 is S, S1 is an integer greater than or equal to 16, and the value of S2 is S1/alpha. The purpose of this is that if the channel jitter between the base station and the terminal is large before, when the base station transmits a new physical layer data bit sequence or a retransmission packet subsequently, it is desirable that the second bit sequence uses a more robust transmission mode, the terminal can perform more accurate channel estimation by using the second bit sequence, so as to help the terminal to receive the first bit sequence better, and the selection of the length of the second bit sequence is related to the communication quality between the base station and the terminal before.
The base station modulates the first bit sequence to obtain M1 modulation symbols, and each modulation symbol carries (S1/M1) bits of information.
The base station modulates the second bit sequence to obtain M2 modulation symbols, each modulation symbol carries (S2/M2) bits of information, wherein (S2/M2) takes a value of max (1, (S1/(beta × M1))). This has the advantage that the second bit sequence uses a lower order modulation scheme, reducing the requirement for channel estimation accuracy, the modulation symbols of the second bit sequence on each subcarrier can be better obtained through a hard demodulation mode, then the channel information on the subcarrier is obtained by dividing the signal received on the subcarrier where the second bit sequence is located by the modulation symbols on the subcarrier, so that more channel information can be used for the soft demodulation operation of the first bit sequence, which is due to the higher modulation order used by the first bit sequence, the accuracy requirement for the channel estimation becomes higher, if a more accurate acquisition is conventionally performed by using many subcarriers to carry demodulation reference signals, an increase in control overhead is inevitably caused, thereby reducing the effective throughput of the overall system, there is a need to find a more balanced scheme between pilot overhead and useful data transmission efficiency. It should be noted that the hard demodulation is to map the symbol received on the subcarrier directly to the reference modulation symbol closest to its euclidean distance, and the soft demodulation is to map the symbol received on the subcarrier to the soft information bit according to the constellation diagram.
The base station uniformly extracts M1 subcarriers from time-frequency continuous (M1+ M2) subcarriers, maps M1 modulation symbols to M1 subcarriers, and maps M2 modulation symbols to the rest M2 subcarriers. This has the advantage that the two types of modulation symbols experience similar channels as much as possible, so that the terminal can use the channel information on the sub-carriers where the M2 modulation symbols are located to demodulate and decode the M1 modulation symbols. The base station carries demodulation reference signals on D1 subcarriers on a time domain symbol located before a time region where (M1+ M2) subcarriers are located, the D1 subcarriers and (M1+ M2) subcarriers are called a first physical layer transmission unit block, and D1 is (M1+ M2) × gamma/16. The purpose of this is to obtain channel information by demodulating the reference signal.
The base station carries demodulation reference signals on D2 subcarriers located on a time domain symbol after a time region where the (M1+ M2) subcarriers are located, the D2 subcarriers and the (M1+ M2) subcarriers are called a second physical layer transmission unit block, and the value of D% is 1.5 × D1. This has the advantage that when the terminal fails to decode the physical layer bit sequence based on M1 physical layer transmission unit blocks transmitted repeatedly before, it is likely that the channel estimation accuracy is not sufficient, and therefore, the number of sub-carriers carrying demodulation reference signals in the second physical layer transmission unit block needs to be increased to help the terminal obtain more accurate channel information.
The base station repeatedly sends N1 first physical layer transmission unit blocks and N2 second physical layer transmission unit blocks to the terminal in the time domain, wherein N1 is an integer larger than or equal to 16, and N2 bits are an integer smaller than N1 and larger than 1.
And the terminal receives the first physical layer transmission unit block and the second physical layer transmission unit block, performs decoding operation, and sends feedback receiving success or receiving failure information to the base station according to a decoding result.
Example 2
On the basis of the embodiment 1, the physical layer data bit sequence includes a cyclic redundancy check bit sequence, and the terminal determines whether the terminal successfully receives the physical layer data bit sequence based on whether the cyclic redundancy check bit sequence passes through the check.
Example 3
When (S1/M1) is greater than or equal to 4, the value of alpha is 8; when (S1/M1)
And when the value of alpha is less than 4, the value of alpha is 4. This has the advantage that when the base station uses a relatively high modulation scheme to transmit data to the terminal, the channel conditions are generally good, so that it is necessary to reduce the length of the second bit sequence as much as possible to improve the spectral efficiency of the useful data transmission, while at the same time taking into account the need to reduce the length of the second bit sequence as much as possible
The terminal obtains the benefit of channel information through the used sub-carriers of the second bit sequence; however, when the base station transmits data to the terminal using a relatively low modulation scheme, the channel condition is generally poor, and therefore, it is necessary to increase the length of the second bit sequence appropriately to counter the influence of channel degradation. Example 4
When (S1/M1) is greater than or equal to 4, the value of beta is 4, which has the advantage that the requirement of high-order modulation symbols on the channel estimation precision is higher, so that the channel information on the subcarrier where the high-order modulation symbols are located needs to be acquired more accurately by using the modulation symbols of lower order, thereby better assisting the demodulation and decoding operation of the high-order modulation symbols; when (S1/M1) is less than 4, the value of beta is 2, which has the advantage that the requirement of low-order modulation symbols on the accuracy of channel estimation is relatively low, so that the spectrum efficiency of the network needs to be considered while acquiring channel information by using relatively low-order modulation symbols.
Example 5
When (S1/M1) is greater than or equal to 4, the value of gamma is 2, so that the channel estimation accuracy requirement of the high-order modulation symbols is higher, and more accurate channel information can be obtained by increasing the number of subcarriers carrying demodulation reference signals; when (S1/M1) is less than 4, the value of gamma is 1, which has the advantage that the requirement of low-order modulation symbols on the channel estimation accuracy is relatively low, and the number of subcarriers carrying demodulation reference signals needs to be configured properly to obtain more accurate channel information.
Example 6
When (S1/M1) is greater than or equal to 4, the value of N2 is N1/16, which has the advantage that the requirement of high-order modulation symbols on channel estimation accuracy is relatively high, and if the terminal receives N1 transmitted first physical layer transmission unit blocks, the terminal fails to successfully acquire a physical layer data bit sequence packet, which indicates that the channel estimation accuracy may be insufficient, and therefore, fewer second physical layer transmission unit blocks are required to assist the terminal to acquire more channel information and successfully receive the physical layer data bit sequence packet with the highest probability; when (S1/M1) is less than 4, the value of N2 is N1/8, which has the advantage that the requirement of low-order modulation symbols on the channel estimation accuracy is general, and if the terminal receives N1 transmitted first physical layer transmission unit blocks, it fails to successfully acquire a physical layer data bit sequence packet, which indicates that the signal receiving power may be insufficient, and therefore, more second physical layer transmission unit blocks are required to assist the terminal to successfully receive the physical layer data bit sequence packet with the highest probability.
Example 7
When (81/M1) is greater than or equal to 4, the transmission power on the sub-carrier carrying the demodulation reference signal in the first physical layer transmission unit block is 3dB greater than that on other sub-carriers, which is because the requirement of high-order modulation symbols on the channel estimation accuracy is higher, so the accuracy of the channel estimation is improved by increasing the transmission power; when (S1/M1) is less than 4, the transmission power on the sub-carrier carrying the demodulation reference signal in the second physical layer transmission unit block is equal to the transmission power on the other sub-carriers.
Example 8
When the Gi/M1 is greater than or equal to 4, the transmission power on the subcarrier carrying the demodulation reference signal in the second physical layer transmission unit block is 6dB greater than the transmission power on other subcarriers, which is because the requirement of the high-order modulation symbol on the channel estimation precision is higher, and if the terminal receives N1 transmitted first physical layer transmission unit blocks, the physical layer data bit sequence packet cannot be successfully acquired, which indicates that the channel estimation accuracy may be insufficient, and therefore the transmission power of the demodulation reference signal needs to be increased to acquire more accurate channel information; when (S1/M1) is less than 4, the transmission power on the subcarrier carrying the demodulation reference signal in the second physical layer transmission unit block is 3dB greater than that on other subcarriers, which has the advantage that the requirement of the low-order modulation symbols on the channel estimation accuracy is generally met, and if the terminal receives the first physical layer transmission unit blocks transmitted in N1, it is not successful to obtain the physical layer data bit sequence packet, which indicates that the signal reception power may be insufficient and the channel estimation accuracy also has a certain problem, so the transmission power of the demodulation reference signal can be properly increased.
Example 9
The terminal performs hard demodulation on the M2 modulation symbols, and performs soft decoding on the M1 modulation symbols according to channel information on the M2 subcarriers obtained after the hard demodulation and channel information obtained based on demodulation reference signal estimation. The method has the advantages that under a better channel condition, an estimated value obtained by hard demodulation of a low-order modulation symbol can be regarded as a true value with high probability, and then a result obtained by dividing a signal received on a subcarrier corresponding to the low-order modulation symbol by the estimated value is used as a channel estimated value on the corresponding subcarrier, so that the number of subcarriers which can be used for channel estimation is increased equivalently, a certain network spectrum efficiency is properly kept, and better compromise is achieved.
Example 10
When the (S1/M1) is greater than or equal to 4, the transmission power used by the terminal for feeding back the successful reception information is greater than the transmission power used for feeding back the failed reception information by 6dB, so that the probability that the base station successfully receives the successful reception information fed back by the terminal is increased, and the spectrum efficiency of the system is improved; when the (S1/M1) is less than 4, the transmission power used by the terminal for feeding back the successful reception information is 3dB greater than the transmission power used for feeding back the failed reception information, so that the probability that the base station successfully receives the successful reception information fed back by the terminal is increased, and the frequency spectrum of the system is improved
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A robust Internet of things data transmission method is characterized by comprising the following steps:
s10, the first communication node receives F feedback information sent by the second communication node, where F1 pieces of feedback information in the F feedback information indicate that the physical layer data bit sequence corresponding to the feedback information is successfully received, and F2 pieces of feedback information indicate that the physical layer data bit sequence corresponding to the feedback information is failed to be received, where F1+ F2 is F, F1 is an integer greater than or equal to 1, and F2 is an integer greater than or equal to 0;
s20, if F2/F1 is smaller than 0.2, the first communication node obtains X1 symbols from the physical layer data bit sequence with length S using the same modulation method, maps the X1 symbols to X1 subcarriers, and transmits demodulation reference signals using X1/2 subcarriers, where the X1 subcarriers and the X1/2 subcarriers form an initial physical layer transmission unit block, the first communication node repeatedly transmits the initial physical layer transmission unit block Z times to the second communication node in the time domain, and the process goes to step S100;
s30, if the F2/F1 is greater than or equal to 0.2, or the first communication node receives the failure information of the second communication node feedback receiving the physical layer data bit sequence with the length S, the first communication node divides the physical layer data bit sequence with the length S into a first bit sequence with the length S1 and a second bit sequence with the length S2, wherein the sum of S1 and S2 is S, S1 is an integer greater than or equal to 16, and the value of S2 is S1/alpha;
s40, the first communication node modulates the first bit sequence to obtain M1 modulation symbols, and each modulation symbol carries S1/M1 bits of information;
s50, the first communication node modulates the second bit sequence to obtain M2 modulation symbols, each modulation symbol carries S2/M2 bits of information, wherein S2/M2 is max (1, (S1/(beta × M1)));
s60, the first communication node uniformly extracting M1 subcarriers from M1+ M2 subcarriers which are continuous in time and frequency, mapping the M1 modulation symbols to the M1 subcarriers, and mapping the M2 modulation symbols to the rest M2 subcarriers;
s70, the first communication node carrying demodulation reference signals on D1 subcarriers on a time domain symbol located before a time region where the M1+ M2 subcarriers are located, the D1 subcarriers and the M1+ M2 subcarriers are called a first physical layer transmission unit block, where D1 is M1+ M2 × gamma/16;
s80, the first communication node carrying demodulation reference signals on D2 subcarriers located on time domain symbols after a time region where the M1+ M2 subcarriers are located, the D2 subcarriers and the (M1+ M2) subcarriers are referred to as a second physical layer transmission unit block, wherein a value of D2 is 1.5 × D1;
s90, the first communication node repeatedly transmits NI of the first blocks of physical layer transmission unit and N2 of the second blocks of physical layer transmission unit to the second communication node in time domain, where N1 is an integer greater than or equal to 16, and N2 bits are an integer smaller than N1 and greater than 1;
s100, the second communication node receives the initial physical layer transmission unit block or the first physical layer transmission unit block and the second physical layer transmission unit block, carries out demodulation and decoding operation, and sends feedback receiving success or receiving failure information to the first communication node according to a decoding result.
2. The robust internet of things data transmission method as claimed in claim 1, wherein the physical layer data bit sequence comprises a cyclic redundancy check bit sequence, and the second communication node determines whether it successfully received the physical layer data bit sequence based on the cyclic redundancy check bit sequence.
3. The robust internet of things data transmission method according to claim 1, wherein when S1/M1 is greater than or equal to 4, the value of alpha is 8, and the value of beta is 4; when (S1/M1) is less than 4, the value of alpha is 4, and the value of beta is 2.
4. The robust data transmission method of the internet of things as claimed in claim 1, wherein when S1/M1 is greater than or equal to 4, the value of gamma is 2; when S1/M1 is less than 4, the value of gamma is 1.
5. The robust data transmission method for the internet of things as claimed in claim 1, wherein when S1/M1 is greater than or equal to 4, the value of N2 is N1/16; when S1/M1 is smaller than 4, the value of N2 is N1/8.
6. The robust internet of things data transmission method of claim 1, wherein when S1/M1 is greater than or equal to 4, the transmission power on the sub-carriers carrying the demodulation reference signals in the first physical layer transmission unit block is 3dB greater than the transmission power on the other sub-carriers, and when S1/M1 is less than 4, the transmission power on the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is equal to the transmission power on the other sub-carriers.
7. The robust internet of things data transmission method of claim 1, wherein when S1/M1 is greater than or equal to 4, the transmission power on the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is 6dB greater than the transmission power on the other sub-carriers, and when S1/M1 is less than 4, the transmission power on the sub-carriers carrying the demodulation reference signals in the second physical layer transmission unit block is 3dB greater than the transmission power on the other sub-carriers.
8. The robust internet of things data transmission method of claim 1, wherein the second communication node performs hard demodulation on the M2 modulation symbols, and performs soft decoding on the M1 modulation symbols according to the channel information on the M2 subcarriers obtained after the hard demodulation and the channel information estimated based on the demodulation reference signal.
9. The robust internet of things data transmission method of claim 1, wherein when S1/M1 is greater than or equal to 4, the transmission power used by the second communication node for feeding back the reception success information is 6dB greater than the transmission power used for feeding back the reception failure information; when the S1/M1 is less than 4, the transmission power used by the second communication node for feeding back the reception success information is 3dB greater than the transmission power used for feeding back the reception failure information.
10. A robust internet of things data transmission system, characterized in that the system comprises a memory having stored thereon a computer program which, when executed by a processor, carries out the steps of the data transmission method according to any one of claims 1-9.
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