CN109413622B - Method for solving data transmission conflict in Internet of things - Google Patents
Method for solving data transmission conflict in Internet of things Download PDFInfo
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- CN109413622B CN109413622B CN201811589955.XA CN201811589955A CN109413622B CN 109413622 B CN109413622 B CN 109413622B CN 201811589955 A CN201811589955 A CN 201811589955A CN 109413622 B CN109413622 B CN 109413622B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Abstract
The invention provides a method for solving data transmission conflict in the Internet of things, which comprises the following steps: the base station sends the allocation information of the first time-frequency resource set and the description information of the first sending mode to the first terminal; allocating a second time frequency resource set to a second terminal, wherein the first time frequency resource set comprises an overlapped resource set overlapped with the second time frequency resource set and a non-empty third time frequency resource set; the base station determines a second sending mode of the first data packet according to the continuity of the resources in the third time-frequency resource set in time; the base station sends the description information of the overlapped resource set to the first terminal; the first terminal determines a second sending mode of the first data packet according to the description information and receives the first data packet; if the receiving is unsuccessful, sending feedback information to the base station; and the base station sends part of contents of the first data packet to the first terminal by using the fifth time-frequency resource set. The invention overcomes the problem of data transmission conflict in the existing machine communication.
Description
Technical Field
The invention relates to a data transmission method, in particular to a method for solving data transmission conflict in the 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 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 the fifth generation mobile communication system, the most important core scenario to be studied in depth is machine communication, such as industrial 4.0, car networking, robots, etc., and when time-frequency resources used by different service data are overlapped, how to handle transmission conflicts between different service data is a problem to be solved urgently at present.
Disclosure of Invention
The invention provides a method for solving data transmission conflict in the Internet of things, aiming at solving the problem of data transmission conflict when time-frequency resources used by different service data in the existing machine communication are overlapped.
The invention comprises the following steps:
s1: the base station sends allocation information of a first time-frequency resource set and first sending mode description information to a first terminal, wherein the first sending mode description information at least comprises one of the following information: demodulating the reference signal position, the modulation and coding mode of the first data packet and the transmission layer number of the first data packet;
s2: the base station allocates a second time-frequency resource set to a second terminal, wherein the second time-frequency resource set overlaps with the first time-frequency resource set, the overlapping part is called an overlapping resource set, resources contained in the frequency domain of the first time-frequency resource set are subsets of the resources contained in the frequency domain of the second time-frequency resource set, and the first time-frequency resource set comprises the overlapping resource set and a non-empty third time-frequency resource set;
s3: the base station determines a second sending mode of the first data packet according to the continuity of the resources in the third time-frequency resource set in time, and sends the first data packet to the first terminal according to the first sending mode and/or the second sending mode, wherein the second sending mode description information at least comprises one of the following information: demodulating a reference signal position, a modulation and coding mode of the first data packet on different time domain symbols, a multi-antenna transmission mode of the first data packet on different time domain symbols, a dividing mode of the first data packet, a sending power of the first data packet on different time domain symbols, and whether to use a fourth time-frequency resource set to send the first data packet;
s4: the base station sends the description information of the overlapped resource set to the first terminal, preferably, the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel;
s5: the first terminal determines a second sending mode of the first data packet according to the description information, and receives the first data packet according to the first and/or the second sending mode;
s6: if the first terminal fails to successfully receive the description information of the overlapped resource set and the first terminal fails to successfully receive the first data packet on the first time-frequency resource set, the first terminal combines the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set and then tries to acquire the first data packet;
s7: when a first terminal cannot successfully acquire a first data packet, the first terminal sends feedback information to a base station, wherein the feedback information carries information that the first data packet cannot be successfully received and predicted bit error rate information;
s8: and after receiving the feedback information, the base station sends part of content of the first data packet to the first terminal by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information.
The present invention is further improved, in step S8, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as the size of the overlapping resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times the size of the first time-frequency resource set.
In step S3, when the third set of time-frequency resources is continuous in time domain and starts from the time domain starting position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources by using the first transmission method.
In step S3, when the third set of time-frequency resources is continuous in time domain and does not start from the time domain starting position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources using a second transmission method.
The present invention further improves that, when only one symbol of the first transmission mode transmits a demodulation reference signal and the demodulation reference signal is located at the time domain starting position of the first time-frequency resource set, the demodulation reference signal of the second transmission mode is located at the time domain starting position of the third time-frequency resource set.
The present invention is further improved, when a ratio of the number of resources included in the first time-frequency resource set to the number of resources included in the third time-frequency resource set is X, on a single resource of the third time-frequency resource set, the sending power of the first data packet is sent by using a second sending method, which is X times the sending power of the first data packet sent by using the first sending method on the single resource of the first time-frequency resource set, and the number of resources occupied by the demodulation reference signal of the second sending method is 1/2X of the number of resources occupied by the demodulation reference signal of the first sending method. The content of the first data packet cannot be transmitted by using the overlapped time-frequency resource set, so that the performance of the first terminal for demodulating the first data packet is reduced, and the demodulation performance of the rest part is effectively improved by improving the power and reducing the demodulation reference channel density.
In a further improvement of the present invention, when X is less than 4, the modulation and coding scheme corresponding to the second transmission scheme is the same as the modulation and coding scheme corresponding to the first transmission scheme, and when X is greater than or equal to 4, the spectral efficiency corresponding to the modulation and coding scheme corresponding to the second transmission scheme is 1+ X/2 times the spectral efficiency corresponding to the modulation and coding scheme corresponding to the first transmission scheme. Since the performance of receiving the first data packet by the first terminal is greatly affected when the number of overlapping resources is large, the effect can be effectively reduced by increasing the spectrum efficiency.
In step S3, when the third set of time-frequency resources is discontinuous in the time domain, that is: the base station divides the first Data packet into two sub-Data packets Data-A and Data-B, transmits the sub-Data packets Data-A by using a first transmission mode, and transmits the sub-Data packets Data-B by using a second transmission mode, wherein each sub-time frequency resource set is continuous in time domain, and each sub-time frequency resource set carries demodulation reference signals.
The invention is further improved, when the ratio of the number of resources contained in the first time-frequency resource set except the first sub time-frequency resource set a to the number of resources contained in the sub time-frequency resource set B is Y, the sending power of the sub Data packet Data-B is sent in a second sending mode on a single resource of the sub time-frequency resource set B, which is Y times of the sending power of the sub Data packet Data-a in the first sending mode on the single resource of the sub time-frequency resource set a. After the base station recognizes that the overlapping resource set cannot be used for sending the first data packet to the terminal A, the sending power of the sub time-frequency resource set B located behind the overlapping resource set in terms of time is increased as much as possible, so that the influence of data which cannot be sent by using the overlapping resource set is reduced.
The invention is further improved, when Y is less than 4, the modulation and coding mode corresponding to the second sending mode is the same as the modulation and coding mode corresponding to the first sending mode, and the number of transmission layers corresponding to the second sending mode is 2 times that of the transmission layers corresponding to the first sending mode; when Y is greater than or equal to 4, the spectral efficiency of the modulation and coding scheme corresponding to the second transmission scheme is 1+ Y/2 times the spectral efficiency of the modulation and coding scheme corresponding to the first transmission scheme, and the number of transmission layers corresponding to the second transmission scheme is the same as the number of transmission layers corresponding to the first transmission scheme.
The present invention is further improved, wherein a ratio of the number of resources included in the first time-frequency resource set to the number of resources included in the third time-frequency resource set is Z, and when Z is greater than or equal to 3 and the number of useful bits included in the first data packet is greater than or equal to 2048, the base station uses the fourth time-frequency resource set, and sends part of data of the first data packet to the first terminal through a spreading code word having a length of S configured to the first terminal, wherein a starting time of the fourth time-frequency resource set is located after an ending time of the first time-frequency resource set, and the number of resources included in the fourth time-frequency resource set is S times of the number of resources included in the overlapping resource set.
Compared with the prior art, the invention has the beneficial effects that: the problem of data transmission conflict in the existing machine communication is solved, and the first terminal is ensured to decode the first data packet quickly and successfully as far as possible through the feedback of the first terminal and the secondary retransmission of the base station by adopting different time-frequency resource sets, so that the user experience of the first terminal is improved; the success rate of transmission is ensured, the transmission performance is greatly improved, and the use efficiency of the network is improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2-4 are schematic diagrams illustrating relationships among the first time-frequency resource set, the second time-frequency resource set, the overlapping resource set, and the third time-frequency resource set.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the present invention comprises the steps of:
s1: the base station sends allocation information of a first time-frequency resource set and first sending mode description information to a first terminal, wherein the first sending mode description information at least comprises one of the following information: demodulating the reference signal position, the modulation and coding mode of the first data packet and the transmission layer number of the first data packet;
s2: the base station allocates a second time-frequency resource set to a second terminal, wherein the second time-frequency resource set overlaps with the first time-frequency resource set, the overlapping part is called an overlapping resource set, resources contained in the frequency domain of the first time-frequency resource set are subsets of the resources contained in the frequency domain of the second time-frequency resource set, and the first time-frequency resource set comprises the overlapping resource set and a non-empty third time-frequency resource set;
s3: the base station determines a second sending mode of the first data packet according to the continuity of the resources in the third time-frequency resource set in time, and sends the first data packet to the first terminal according to the first sending mode and/or the second sending mode, wherein the second sending mode description information at least comprises one of the following information: demodulating a reference signal position, a modulation and coding mode of the first data packet on different time domain symbols, a multi-antenna transmission mode of the first data packet on different time domain symbols, a dividing mode of the first data packet, a sending power of the first data packet on different time domain symbols, and whether to use a fourth time-frequency resource set to send the first data packet;
s4: the base station sends the description information of the overlapped resource set to the first terminal, preferably, the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel;
s5: the first terminal determines a second sending mode of the first data packet according to the description information, and receives the first data packet according to the first and/or the second sending mode;
s6: if the first terminal fails to successfully receive the description information of the overlapped resource set and the first terminal fails to successfully receive the first data packet on the first time-frequency resource set, the first terminal combines the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set and then tries to acquire the first data packet;
s7: when a first terminal cannot successfully acquire a first data packet, the first terminal sends feedback information to a base station, wherein the feedback information carries information that the first data packet cannot be successfully received and predicted bit error rate information;
s8: and after receiving the feedback information, the base station sends part of content of the first data packet to the first terminal by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information. Of course, if the transmission is not successful, the base station may also retransmit in the original transmission mode.
Preferably, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as the size of the overlapping resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times the size of the first time-frequency resource set. This has the advantage of ensuring as much as possible that terminal a successfully decodes the first data packet quickly, improving the user experience of terminal a.
The present invention will be described in detail with reference to examples.
Example 1:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to fig. 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
The base station determines a second sending mode of the first data packet according to the time continuity of the resources in the third time-frequency resource set, and sends the first data packet to the terminal A according to the first sending mode and/or the second sending mode, wherein the second sending mode at least comprises one of the following modes: the position of a demodulation reference signal, the modulation and coding mode of a first data packet on different time domain symbols, the multi-antenna transmission mode of the first data packet on different time domain symbols, the dividing mode of the first data packet, the sending power of the first data packet on different time domain symbols, and whether to use a fourth time frequency resource set to send the first data packet.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A cannot successfully receive the description information (meaning that the terminal A considers that the base station can use all resources in the first time-frequency resource set to send the first data packet) and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, combining the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set by the terminal A, and then trying to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
And the base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set. And the terminal A is ensured to decode the first data packet quickly and successfully as far as possible, and the user experience of the terminal A is improved.
Example 2:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 2, when the third set of time-frequency resources is continuous in the time domain and starts from the time domain start position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources by using the first transmission method.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A cannot successfully receive the description information and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set and the content received on the fourth time-frequency resource set and tries to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends part of content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapping resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the advantage of ensuring that the terminal A decodes the first data packet successfully and the user experience of the terminal A is improved as far as possible.
Example 3:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 3, when the third set of time-frequency resources is continuous in the time domain and does not start from the time domain start position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources by using the second transmission method.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A cannot successfully receive the description information and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set and the content received on the fourth time-frequency resource set and tries to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible.
Example 4:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 3, when the third set of time-frequency resources is continuous in the time domain and does not start from the time domain start position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources by using the second transmission method. Preferably, when only one symbol of the first transmission method transmits the demodulation reference signal and the demodulation reference signal is located at the time domain starting position of the first time-frequency resource set, the demodulation reference signal of the second transmission method is located at the time domain starting position of the third time-frequency resource set.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A cannot successfully receive the description information and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set and the content received on the fourth time-frequency resource set and tries to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible.
Example 5:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 3, when the third set of time-frequency resources is continuous in the time domain and does not start from the time domain start position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources by using the second transmission method. Preferably, when the ratio of the number of resources included in the first time-frequency resource set to the number of resources included in the third time-frequency resource set is X, the sending power for sending the first data packet on a single resource of the third time-frequency resource set by using the second sending method is X times of the sending power for sending the first data packet on a single resource of the first time-frequency resource set by using the first sending method, and the number of resources occupied by the demodulation reference signal of the second sending method is 1/2X of the number of resources occupied by the demodulation reference signal of the first sending method.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A cannot successfully receive the description information and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set and the content received on the fourth time-frequency resource set and tries to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible.
Example 6:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 3, when the third set of time-frequency resources is continuous in the time domain and does not start from the time domain start position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources by using the second transmission method. Preferably, the ratio of the number of resources included in the first time-frequency resource set to the number of resources included in the third time-frequency resource set is X, when X is less than 4, the modulation and coding scheme corresponding to the second transmission scheme is the same as the modulation and coding scheme corresponding to the first transmission scheme, and when X is greater than or equal to 4, the spectral efficiency corresponding to the modulation and coding scheme corresponding to the second transmission scheme is (1+ X/2) times the spectral efficiency of the modulation and coding scheme corresponding to the first transmission scheme.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A cannot successfully receive the description information and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set and the content received on the fourth time-frequency resource set and tries to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible.
Example 7:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 4, when the third time-frequency resource set is discontinuous in time domain and is composed of two sub-time-frequency resource sets a and B, the base station divides the first Data packet into two sub-Data packets Data-a and Data-B, transmits the sub-Data packet Data-a using the first transmission method, and transmits the sub-Data packet Data-B using the second transmission method, wherein each sub-time-frequency resource set is continuous in time domain, and each sub-time-frequency resource set carries demodulation reference signals.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A fails to successfully receive the description information and the terminal A fails to successfully receive the first Data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set and tries to acquire the first Data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible.
Example 8:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 4, when the third time-frequency resource set is discontinuous in time domain and is composed of two sub-time-frequency resource sets a and B, the base station divides the first Data packet into two sub-Data packets Data-a and Data-B, transmits the sub-Data packet Data-a using the first transmission method, and transmits the sub-Data packet Data-B using the second transmission method, wherein each sub-time-frequency resource set is continuous in time domain, and each sub-time-frequency resource set carries demodulation reference signals. Preferably, when the ratio of the number of resources contained in the first time-frequency resource set excluding the first sub-time-frequency resource set a to the number of resources contained in the sub-time-frequency resource set B is Y, the sending power of the sub-packet Data-B sent on a single resource of the sub-time-frequency resource set B by using the second sending method is Y times of the sending power of the sub-packet Data-a sent on a single resource of the sub-time-frequency resource set a by using the first sending method.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A fails to successfully receive the description information and the terminal A fails to successfully receive the first Data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set and tries to acquire the first Data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible.
Example 9:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
As shown in fig. 4, when the third time-frequency resource set is discontinuous in time domain and is composed of two sub-time-frequency resource sets a and B, the base station divides the first Data packet into two sub-Data packets Data-a and Data-B, transmits the sub-Data packet Data-a using the first transmission method, and transmits the sub-Data packet Data-B using the second transmission method, wherein each sub-time-frequency resource set is continuous in time domain, and each sub-time-frequency resource set carries demodulation reference signals. Preferably, when the ratio of the number of resources included in the first time-frequency resource set excluding the first sub time-frequency resource set a to the number of resources included in the sub time-frequency resource set B is Y, when Y is smaller than 4, the modulation and coding scheme corresponding to the second sending method is the same as the modulation and coding scheme corresponding to the first sending method, and the number of transmission layers corresponding to the second sending method is 2 times that of the first sending method; when Y is greater than or equal to 4, the spectral efficiency corresponding to the modulation and coding scheme corresponding to the second transmission scheme is (1+ Y/2) times the spectral efficiency corresponding to the modulation and coding scheme corresponding to the first transmission scheme, and the number of transmission layers corresponding to the second transmission scheme is the same as the number of transmission layers corresponding to the first transmission scheme.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
And if the terminal A fails to successfully receive the description information and the terminal A fails to successfully receive the first Data packet on the first time-frequency resource set, the terminal A combines the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set and tries to acquire the first Data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends partial content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapped resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the terminal A is ensured to decode the first data packet quickly and successfully as far as possible, and the user experience of the terminal A is improved.
Example 10:
the base station sends the first time-frequency resource set allocation information and the first sending mode description information to the terminal A, wherein the first sending mode at least comprises one of the following modes: the reference signal location is demodulated. Preferably, the modulation and coding scheme of the first data packet, the number of transmission layers of the first data packet, and the first data packet are configured by T bits obtained by channel coding B useful bits, which may refer to the channel coding scheme of the 4G or 5G mobile communication system.
The base station allocates a second set of time-frequency resources to the terminal B, where, as shown in fig. 2 to 4, the second set of time-frequency resources overlaps with the first set of time-frequency resources (the overlapping portion is referred to as an overlapping resource set), resources included in the frequency domain of the first set of time-frequency resources are subsets of resources included in the frequency domain of the second set of time-frequency resources, and the first set of time-frequency resources is composed of an overlapping resource set and a non-empty third set of time-frequency resources.
The base station determines a second sending mode of the first data packet according to the time continuity of the resources in the third time-frequency resource set, and sends the first data packet to the terminal A according to the first sending mode and/or the second sending mode, wherein the second sending mode at least comprises one of the following modes: the position of a demodulation reference signal, the modulation and coding mode of a first data packet on different time domain symbols, the multi-antenna transmission mode of the first data packet on different time domain symbols, the dividing mode of the first data packet, the sending power of the first data packet on different time domain symbols, and whether to use a fourth time frequency resource set to send the first data packet.
The base station sends the description information of the overlapped resource set to the terminal A, wherein the sending time of the description information is positioned after the ending time of the third time-frequency resource set, so that the method has the advantages of reducing the calculation complexity of the terminal A as much as possible and avoiding the parallel processing of the decoding of a plurality of control channels and the decoding of a data channel.
Preferably, the ratio of the number of resources included in the first time-frequency resource set to the number of resources included in the third time-frequency resource set is Z, and when Z is greater than or equal to 3 and the number of useful bits included in the first data packet is greater than or equal to 2048, the base station uses the fourth time-frequency resource set to send part of data of the first data packet to the terminal a through the spreading code word with the length of S configured to the terminal a, where the starting time of the fourth time-frequency resource set is located after the ending time of the first time-frequency resource set, and the number of resources included in the fourth time-frequency resource set is S times of the number of resources included in the overlapping resource set.
And if the terminal A cannot successfully receive the description information (meaning that the terminal A considers that the base station can use all resources in the first time-frequency resource set to send the first data packet) and the terminal A cannot successfully receive the first data packet on the first time-frequency resource set, combining the content received on the first time-frequency resource set with the content received on the fourth time-frequency resource set by the terminal A, and then trying to acquire the first data packet.
If terminal a sends feedback information to the base station, where the feedback information carries information that the first data packet was not successfully received, and the predicted bit error rate information (the terminal estimates the value from the soft information in the data decoding process).
The base station sends part of content of the first data packet to the terminal A by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as that of the overlapping resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times that of the first time-frequency resource set, so that the advantage of ensuring that the terminal A decodes the first data packet successfully and the user experience of the terminal A is improved as far as possible.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A method for solving data transmission conflict in the Internet of things is characterized by comprising the following steps:
s1: the base station sends allocation information of a first time-frequency resource set and first sending mode description information to a first terminal, wherein the first sending mode description information at least comprises one of the following information: demodulating the reference signal position, the modulation and coding mode of the first data packet and the transmission layer number of the first data packet;
s2: the base station allocates a second time-frequency resource set to a second terminal, wherein the second time-frequency resource set overlaps with the first time-frequency resource set, the overlapping part is called an overlapping resource set, resources contained in the frequency domain of the first time-frequency resource set are subsets of the resources contained in the frequency domain of the second time-frequency resource set, and the first time-frequency resource set comprises the overlapping resource set and a non-empty third time-frequency resource set;
s3: the base station determines a second sending mode of the first Data packet according to the time continuity of the resources in the third time-frequency resource set, and sends the first Data packet to the first terminal according to the first sending mode or the second sending mode, or when the third time-frequency resource set is discontinuous in time domain and consists of two sub-time-frequency resource sets A and a sub-time-frequency resource set B, the base station divides the first Data packet into two sub-Data packets Data-A and Data-B, sends the sub-Data packet Data-A by using the first sending mode, and sends the sub-Data packet Data-B by using the second sending mode, wherein the second sending mode description information at least comprises one of the following information: demodulating a reference signal position, a modulation and coding mode of the first data packet on different time domain symbols, a multi-antenna transmission mode of the first data packet on different time domain symbols, a dividing mode of the first data packet, a transmission power of the first data packet on different time domain symbols, whether to use a fourth time-frequency resource set to transmit the first data packet, wherein a starting time of the fourth time-frequency resource set is located after an ending time of the first time-frequency resource set, and a number of resources included in the fourth time-frequency resource set is S times of a number of resources included in the overlapping resource set;
s4: the base station sends the description information of the overlapped resource set to the first terminal;
s5: the first terminal determines a second transmission mode of the first data packet according to the second transmission mode description information and description information of the overlapped resource set, and receives the first data packet according to the first and/or the second transmission mode;
s6: if the first terminal fails to successfully receive the description information of the overlapped resource set, the first terminal fails to successfully receive the first data packet on the first time-frequency resource set, and the base station uses a fourth time-frequency resource set to send the first data packet, the first terminal combines the content received on the first time-frequency resource set and the content received on the fourth time-frequency resource set and then tries to acquire the first data packet;
s7: when a first terminal cannot successfully acquire a first data packet, the first terminal sends feedback information to a base station, wherein the feedback information carries information that the first data packet cannot be successfully received and predicted bit error rate information;
s8: and after receiving the feedback information, the base station sends part of content of the first data packet to the first terminal by using a fifth time-frequency resource set, wherein the size of the fifth time-frequency resource set is determined by the base station according to the predicted bit error rate information.
2. The method for resolving data transmission conflicts in the internet of things as claimed in claim 1, wherein: in step S8, if the predicted bit error rate information is less than or equal to 20%, the size of the fifth time-frequency resource set is the same as the size of the overlapping resource set, and if the predicted bit error rate information is greater than 20%, the size of the fifth time-frequency resource set is 2 times the size of the first time-frequency resource set.
3. The method for resolving data transmission conflict in internet of things according to claim 1 or 2, wherein: in step S3, when the third set of time-frequency resources is consecutive in time domain and starts from the time domain starting position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources using the first transmission method.
4. The method for resolving data transmission conflict in internet of things according to claim 1 or 2, wherein: in step S3, when the third set of time-frequency resources is continuous in time domain and does not start from the time domain start position of the first set of time-frequency resources, the base station transmits the first data packet on the third set of time-frequency resources using a second transmission method.
5. The method for resolving data transmission conflicts in the internet of things as claimed in claim 4, wherein: when only one symbol of the first transmission mode transmits a demodulation reference signal and the demodulation reference signal is located at the time domain starting position of the first time-frequency resource set, the demodulation reference signal of the second transmission mode is located at the time domain starting position of the third time-frequency resource set.
6. The method for resolving data transmission conflicts in the internet of things as claimed in claim 4, wherein: when the ratio of the number of resources included in the first time-frequency resource set to the number of resources included in the third time-frequency resource set is X, the sending power of sending the first data packet by adopting the second sending method on a single resource of the third time-frequency resource set is X times of the sending power of sending the first data packet by adopting the first sending method on a single resource of the first time-frequency resource set, and the number of resources occupied by the demodulation reference signal of the second sending method is (1/2) X of the number of resources occupied by the demodulation reference signal of the first sending method.
7. The method for resolving data transmission conflicts in the internet of things as claimed in claim 6, wherein: when X is less than 4, the modulation and coding scheme corresponding to the second transmission scheme is the same as the modulation and coding scheme corresponding to the first transmission scheme, when X is greater than or equal to 4, the modulation and coding scheme corresponding to the second transmission scheme is different from the modulation and coding scheme corresponding to the first transmission scheme, and the spectral efficiency corresponding to the modulation and coding scheme corresponding to the second transmission scheme is 1+ X/2 times of the spectral efficiency of the modulation and coding scheme corresponding to the first transmission scheme.
8. The method for resolving data transmission conflict in internet of things according to claim 1 or 2, wherein: in step S3, when the third set of time-frequency resources is discontinuous in the time domain, that is: the base station divides the first Data packet into two sub-Data packets Data-A and Data-B, transmits the sub-Data packets Data-A by using a first transmission mode, and transmits the sub-Data packets Data-B by using a second transmission mode, wherein each sub-time frequency resource set is continuous in time domain, and each sub-time frequency resource set carries demodulation reference signals.
9. The method for resolving data transmission conflicts in the internet of things as claimed in claim 8, wherein: when the ratio of the number of the resources contained in the first time-frequency resource set except the sub time-frequency resource set A to the number of the resources contained in the sub time-frequency resource set B is Y, the sending power of the sub Data packet Data-B sent by adopting the second sending mode on a single resource of the sub time-frequency resource set B is Y times of the sending power of the sub Data packet Data-A sent by adopting the first sending mode on the single resource of the sub time-frequency resource set A;
when Y is less than 4, the modulation and coding scheme corresponding to the second transmission scheme is the same as the modulation and coding scheme corresponding to the first transmission scheme, and the number of transmission layers corresponding to the second transmission scheme is 2 times that corresponding to the first transmission scheme; when Y is greater than or equal to 4, the modulation and coding scheme corresponding to the second transmission scheme is different from the modulation and coding scheme corresponding to the first transmission scheme, the spectral efficiency of the modulation and coding scheme corresponding to the second transmission scheme is 1+ Y/2 times of the spectral efficiency of the modulation and coding scheme corresponding to the first transmission scheme, and the number of transmission layers corresponding to the second transmission scheme is the same as the number of transmission layers corresponding to the first transmission scheme.
10. The method for resolving data transmission conflict in internet of things according to claim 1 or 2, wherein: and when the ratio of the number of resources contained in the first time-frequency resource set to the number of resources contained in the third time-frequency resource set is Z, and Z is greater than or equal to 3 and the number of useful bits contained in the first data packet is greater than or equal to 2048, the base station sends part of data of the first data packet to the first terminal by using the fourth time-frequency resource set through a spread spectrum code word with the length of S configured to the first terminal.
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