CN110933649A

CN110933649A - Data sending method in narrow-band Internet of things

Info

Publication number: CN110933649A
Application number: CN201911119776.4A
Authority: CN
Inventors: 王洋; 张庆平
Original assignee: Shenzhen Polytechnic
Current assignee: Shenzhen Polytechnic
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-03-27
Anticipated expiration: 2039-11-15
Also published as: CN110933649B

Abstract

The invention provides a data sending method in a narrowband Internet of things, which comprises the following steps: the terminal sends the sparsity information of the beam link to the base station and measures the electric quantity of the terminal; if the electric quantity of the terminal is more than or equal to 60%, the base station sends a first transmission packet to the terminal by using a first type downlink transmission beam, if the electric quantity of the terminal is less than 60%, the base station sends the first transmission packet to the terminal by using a second type downlink transmission beam; the terminal sends and receives feedback resource information of the retransmission packet, if the retransmission packet is successfully sent, the base station does not send service information to the terminal any more, if the retransmission packet is failed to be sent, the downlink transmission beam of the same radio frequency channel as the downlink transmission beam is selected to send the retransmission packet, if the retransmission packet is failed to be sent, and the terminal and the base station are in beam matching. The problem of poor data spectrum efficiency in the high-frequency Internet of things is solved, and the spectrum efficiency of the Internet of things system is improved.

Description

Data sending method in narrow-band Internet of things

Technical Field

The invention belongs to the field of wireless communication, and particularly relates to a data transmission method in a narrowband 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 a fifth generation mobile communication system, one scenario to be studied is the problem of efficient and reliable transmission of data in a narrowband internet of things that uses a high frequency band for communication. Because the high-frequency communication path loss is very large, a data transmission technology based on beam forming is usually adopted, and the beam is very easily influenced by factors such as object blocking, so that the transmission efficiency is very low, the situation that data cannot be transmitted often occurs, and the important problem to be solved by the narrow-band internet of things system is urgently needed.

Disclosure of Invention

The invention aims to provide a data transmission method in a narrow-band Internet of things, and aims to solve the problem of low spectrum efficiency of data transmission in the Internet of things which uses a high-frequency band for communication.

The invention is realized in such a way that a data sending method in a narrow-band Internet of things comprises the following steps:

s1: the terminal sends the sparsity information of the beam link to the base station and measures the electric quantity of the terminal through a radio frequency channel;

s2: if the electric quantity of the terminal is more than or equal to 60%, the terminal reports description information of a first type downlink transmission beam of the base station which can be received by the terminal to a base station, the base station uses the first type downlink transmission beam to transmit a service information initial packet to the terminal, if the electric quantity of the terminal is less than 60%, the terminal reports the description information of a second type downlink transmission beam of the base station which can be received by the terminal to the base station, and the base station uses the second type downlink transmission beam to transmit a service information initial packet to the terminal;

s3: if the terminal successfully decodes and reads the data information, the information transmission is completed, and if the terminal fails to decode, the terminal sends feedback resource information to the base station;

s4: after receiving the feedback resource information sent by the terminal, the base station sends a service information retransmission packet;

s5: the terminal sends feedback resource information of a received service information retransmission packet to the base station, if the service information retransmission packet is successfully sent, the base station does not send service information to the terminal any more, if the service information retransmission packet is failed to be sent, and the base station uses the first type of downlink transmission beam to send a service information initial transmission packet to the terminal before, the downlink transmission beam of the same radio frequency channel as the downlink transmission beam of the previously transmitted information is selected to continue sending the service information retransmission packet until the retransmission packet of the service information sent by the terminal is successfully received, if the service information retransmission packet is failed to be sent, and the base station uses the second type of downlink transmission beam to send the service information initial transmission packet to the terminal before, and the terminal and the base station perform beam pairing again.

The further technical scheme of the invention is as follows: the beam link sparsity value is N M/10, wherein N is the number of downlink transmission beams of a base station, M is the number of downlink receiving beams of a terminal, the base station performs beam training based on a compressive sensing algorithm with the terminal according to the beam link sparsity information, and the number of special training beams transmitted to the terminal by the base station is equal to the beam link sparsity value;

the radio frequency channel includes a first radio frequency channel and a second radio frequency channel, the description information of the first type of downlink transmission beam includes four downlink transmission beams, a reception quality intensity corresponding to each downlink transmission beam, radio frequency channel identification information of a downlink reception beam of the terminal corresponding to the downlink transmission beam, and interference information between the four downlink transmission beams, the four downlink transmission beams are respectively called a first downlink transmission beam, a second downlink transmission beam, a third downlink transmission beam, and a fourth downlink transmission beam from top to bottom according to the reception quality intensity, the downlink reception beam of the terminal corresponding to the first downlink transmission beam is called a first downlink reception beam, the downlink reception beam of the terminal corresponding to the second downlink transmission beam is called a second downlink reception beam, and the downlink reception beam of the terminal corresponding to the third downlink transmission beam is called a third downlink reception beam A beam, a downlink receive beam of the terminal corresponding to the fourth downlink transmit beam is referred to as a fourth downlink receive beam, at least one of the first downlink receive beam, the second downlink receive beam, the third downlink receive beam, and the fourth downlink receive beam is formed based on the first radio frequency channel, and at least one downlink receive beam is formed based on the second radio frequency channel;

the second type of downlink transmission beam description information includes two downlink transmission beam identifiers of the base station and a reception quality intensity corresponding to each downlink transmission beam, the two downlink transmission beams are respectively called a fifth downlink transmission beam and a sixth downlink transmission beam from top to bottom according to the reception quality intensity, a downlink reception beam of the terminal corresponding to the fifth downlink transmission beam is called a fifth downlink reception beam, a downlink reception beam of the terminal corresponding to the sixth downlink transmission beam is called a sixth downlink reception beam, and the fifth downlink reception beam and the sixth downlink reception beam are formed based on the same radio frequency channel.

The further technical scheme of the invention is as follows: the step S2 includes the steps of:

s21: if the base station receives the description information of the first type of downlink transmission wave beam, the base station uses the first downlink transmission wave beam to transmit a physical downlink control channel to the terminal, and uses the first downlink transmission wave beam to transmit a service information first transmission packet to the terminal based on the configuration information carried by the physical downlink control channel;

s22: and if the base station receives the description information of the second type downlink transmission beam, the base station transmits a physical downlink control channel to the terminal by using the fifth downlink transmission beam, and transmits a service information first transmission packet to the terminal by using the fifth downlink transmission beam based on the configuration information carried by the physical downlink control channel.

The further technical scheme of the invention is as follows: the physical downlink control channel includes configuration information of a service information first-pass packet sent by the base station to the terminal, the configuration information includes coding information used by the base station to send the service information to the terminal and the feedback resource information used by the terminal to send the service information success or failure information, and the feedback resource information includes a first feedback resource and a second feedback resource.

The further technical scheme of the invention is as follows: the step S3 includes the steps of:

s31: if the terminal sends the description information of the first type downlink transmission beam in the step S2, and the decoding fails after receiving the service information first transmission packet sent by the base station, and the difference between the received signal-to-noise ratio of the service information first transmission packet and the reference signal-to-noise ratio obtained by the configuration information is not more than 1.5dB, sending failure information to the base station by using the first feedback resource according to the first uplink transmission beam;

s32: if the terminal sends the description information of the first type downlink transmission beam in the step S2, and the decoding fails after receiving the service information first transmission packet sent by the base station, and the difference between the received signal-to-noise ratio of the service information first transmission packet and the reference signal-to-noise ratio obtained by the configuration information is greater than 1.5dB and less than 6dB, sending failure information to the base station by using the second feedback resource according to the first uplink transmission beam;

s33: if the terminal fails to decode after receiving a service information initial transmission packet sent by the base station, and the difference between the receiving signal-to-noise ratio of the service information initial transmission packet and the reference signal-to-noise ratio obtained by the configuration information is greater than 6dB, the first uplink transmission beam sends receiving failure information to the base station by using the first feedback resource, the terminal determines an uplink transmission beam corresponding to a downlink receiving beam corresponding to the downlink transmission beam according to the downlink transmission beam description information by using a downlink transmission beam with the strongest receiving quality corresponding to another radio frequency channel of the terminal, and sends the receiving failure information to the base station on the second feedback resource by using the uplink transmission beam;

s34: if the terminal sends the description information of the second type downlink transmission beam in the step S2, and the decoding fails after receiving the service information first transmission packet sent by the base station, and the difference between the received signal-to-noise ratio of the service information first transmission packet and the reference signal-to-noise ratio obtained by the configuration information is not more than 1.5dB, sending failure information to the base station by using the first feedback resource according to the fifth uplink transmission beam;

s35: if the terminal sends the description information of the second type downlink transmission beam in step S2, and the decoding fails after receiving the service information first transmission packet sent by the base station, and the difference between the received signal-to-noise ratio of the service information first transmission packet and the reference signal-to-noise ratio obtained by the configuration information is greater than 1.5dB, the terminal sends failure information to the base station using the second feedback resource according to the sixth uplink transmission beam.

The further technical scheme of the invention is as follows: the step S4 includes the steps of:

s41: if the base station receives the description information of the first type of downlink transmission beam sent by the terminal before and receives failure information on the first feedback resource, the base station continues to use the first downlink transmission beam to send a service information retransmission packet;

s42: if the base station receives the description information of the first type downlink transmission beam sent by the terminal before and receives failure information on the second feedback resource, the base station sends a service information retransmission packet by using a next downlink transmission beam with strong reception quality intensity in the first type downlink transmission beam, and the next downlink transmission beam with strong reception quality intensity in the downlink transmission beam is called as an auxiliary downlink transmission beam;

s43: if the base station receives the description information of the second type downlink transmission beam transmitted by the terminal before and receives failure information on the first feedback resource, the base station continues to use the fifth downlink transmission beam to transmit a service information retransmission packet;

s44: if the base station receives the description information of the second type downlink transmission beam sent by the terminal before and receives failure information on the second feedback resource, the base station sends a service information retransmission packet by using the sixth downlink transmission beam;

s45: and if the base station receives the receiving failure information on the first feedback resource and the second feedback resource, the base station and the terminal perform beam training again through a compressed sensing algorithm, and the base station does not send the retransmission packet of the service information to the terminal any more.

The further technical scheme of the invention is as follows: the step S5 includes the steps of:

s51: if the terminal receives a service information retransmission packet sent by the base station by using the first downlink transmission beam and the service information retransmission packet is successfully sent, sending receiving success information to the base station by using the first feedback resource according to the first uplink transmission beam, and if the service information retransmission packet is unsuccessfully sent, sending receiving failure information to the base station by the terminal at the second feedback resource according to the first uplink transmission beam corresponding to the first downlink reception beam and sending receiving failure information to the base station at the second feedback resource according to the uplink transmission beam corresponding to the downlink reception beam corresponding to the auxiliary downlink transmission beam;

s52: if the terminal receives a service information retransmission packet sent by the base station by using the fifth downlink transmission beam and the service information retransmission packet is successfully sent, the terminal sends successful receiving information to the base station by using the first feedback resource according to the fifth uplink transmission beam, and if the service information retransmission packet is failed to be sent, the terminal sends receiving failure information to the base station at the second feedback resource according to a sixth uplink transmission beam corresponding to the sixth downlink reception beam;

s53: if the terminal receives a service information retransmission packet sent by the base station by using the auxiliary downlink sending beam and the service information retransmission packet is successfully sent, sending receiving success information to the base station by using the second feedback resource according to the uplink sending beam corresponding to the first uplink sending beam and the downlink receiving beam corresponding to the auxiliary downlink sending beam, and if the service information retransmission packet is failed to be sent, sending receiving failure information to the base station by the terminal according to the second feedback resource by using the first uplink sending beam corresponding to the first downlink receiving beam and sending receiving failure information to the base station by using the second feedback resource by using the uplink sending beam corresponding to the downlink receiving beam corresponding to the auxiliary downlink sending beam;

s54: if the terminal receives a service information retransmission packet sent by the base station by using the sixth downlink sending beam and the service information retransmission packet is successfully sent, the terminal sends successful receiving information to the base station by using the second feedback resource according to the sixth uplink sending beam, and if the service information retransmission packet is unsuccessfully sent, the terminal sends receiving failure information to the base station at the second feedback resource according to the sixth uplink sending beam corresponding to the sixth downlink receiving beam.

The further technical scheme of the invention is as follows: the step S5 further includes the steps of:

s55: if the base station has previously received the first type downlink transmission beam description information and the base station receives successful receiving information of a retransmission packet of the service information on the first feedback resource or the second feedback resource, the base station does not send the service information packet to the terminal any more;

s56: if the base station has previously received the description information of the first type of downlink transmission beams and the base station has received the retransmission packet reception failure information of the service information on the second feedback resource, using the downlink transmission beams of the four downlink transmission beams corresponding to the same radio frequency channel identification information as the first downlink transmission beam to replace the first downlink transmission beam to continue to transmit the service information retransmission packet;

s57: if the base station receives the second type downlink transmission beam description information before and the base station receives successful receiving information of a retransmission packet of the service information on the first feedback resource or the second feedback resource, the base station does not send the service information packet to the terminal any more;

s58: if the base station receives the second type downlink transmission beam description information before and the base station receives retransmission packet reception failure information of the service information on the second feedback resource, the terminal transmits beam training request information to the base station to request the base station to perform beam pairing with the base station again.

The further technical scheme of the invention is as follows: when the terminal sends the receiving failure information to the base station by using the second feedback resource according to the first uplink sending beam corresponding to the first downlink receiving beam, the terminal simultaneously starts another radio frequency channel to work; when the first downlink transmission beam transmits the retransmission packet of the service information, the resource used by the first downlink transmission beam is the same as the resource used by the auxiliary downlink transmission beam to transmit the retransmission packet; when the first downlink transmission beam transmits the retransmission packet of the service information, the resource and the sequence of the demodulation reference channel used when the auxiliary downlink transmission beam transmits the retransmission packet are the same.

The further technical scheme of the invention is as follows: an incremental redundancy coding mode is used between the first transmission packet of the service information and the retransmission packet of the service information; when the base station sends the service information retransmission packet to the terminal for the second time, the time-frequency resource used by the base station for sending the service information retransmission packet is twice that of the time-frequency resource used by the base station for sending the first transmission packet; when the terminal uses the second feedback resource to send the information of the successful or failed receiving of the service information, the sending power of the terminal is increased by 3dB compared with the situation that the terminal uses the first feedback resource to send the information of the successful or failed receiving of the service information.

The invention has the beneficial effects that: compared with the prior art, the method provided by the invention overcomes the problem of poor data spectrum efficiency in the high-frequency Internet of things, improves the spectrum efficiency of the Internet of things system and reduces the control overhead.

Drawings

FIG. 1 is a general flow diagram of the process of the present invention;

FIG. 2 is a flow chart of step S2 of the method of the present invention;

FIG. 3 is a flow chart of step S3 of the method of the present invention;

FIG. 4 is a flowchart of step S4 of the method of the present invention;

FIG. 5 is a first flowchart of step S5 of the method of the present invention;

fig. 6 is a second flowchart of step S5 of the method of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

Fig. 1 shows a data transmission method in a narrowband internet of things provided by the invention, which includes the following steps:

Preferentially, the sparsity value of the beam link is N × M/10, wherein N is the number of downlink transmission beams of a base station, M is the number of downlink reception beams of a terminal, the base station performs beam training based on a compressive sensing algorithm with the terminal according to the sparsity information of the beam link, and the number of special training beams transmitted to the terminal by the base station is equal to the sparsity value of the beam link;

As shown in fig. 2, preferably, the step S2 includes the following steps:

Preferably, the physical downlink control channel includes configuration information of a service information first-pass packet sent by the base station to the terminal, the configuration information includes coding information used by the base station to send the service information to the terminal and the feedback resource information used by the terminal to send the service information success or failure information, and the feedback resource information includes a first feedback resource and a second feedback resource.

As shown in fig. 3, preferably, the step S3 includes the following steps:

As shown in fig. 4, preferably, the step S4 includes the following steps:

As shown in fig. 5, preferably, the step S5 includes the following steps:

As shown in fig. 6, preferably, the step S5 further includes the following steps:

Preferentially, when the terminal sends the reception failure information to the base station by using the second feedback resource according to the first uplink transmission beam corresponding to the first downlink reception beam, the terminal simultaneously starts another radio frequency channel to work; when the first downlink transmission beam transmits the retransmission packet of the service information, the resource used by the first downlink transmission beam is the same as the resource used by the auxiliary downlink transmission beam to transmit the retransmission packet; when the first downlink transmission beam transmits the retransmission packet of the service information, the resource and the sequence of the demodulation reference channel used when the auxiliary downlink transmission beam transmits the retransmission packet are the same.

Preferentially, an incremental redundancy coding mode is used between the first transmission packet of the service information and the retransmission packet of the service information; when the base station sends the service information retransmission packet to the terminal for the second time, the time-frequency resource used by the base station for sending the service information retransmission packet is twice that of the time-frequency resource used by the base station for sending the first transmission packet; when the terminal uses the second feedback resource to send the information of the successful or failed receiving of the service information, the sending power of the terminal is increased by 3dB compared with the situation that the terminal uses the first feedback resource to send the information of the successful or failed receiving of the service information.

Example 1:

and the terminal supporting the first radio frequency channel and the second radio frequency channel reports the sparsity information of the beam link to the base station, wherein the sparsity value of the beam link is N M/10, N is the number of downlink transmitting beams of the base station, and M is the number of downlink receiving beams of the terminal. The method has the advantages that the base station can determine the number of resources needed to be used for the beam training based on sparsity, the overhead of the beam training can be effectively reduced through a compressed sensing algorithm, and the spectrum efficiency of the whole system is further improved.

And the base station performs beam training according to the beam link sparsity information and the terminal based on a compressed sensing algorithm, wherein the number of special training beams sent to the terminal by the base station is equal to the beam link sparsity value. The method has the advantages that sparsity characteristics of the high-frequency channel are fully utilized, beam training overhead is effectively reduced through a compressed sensing mode, and reliability of beam information is improved.

The terminal measures the own electric quantity condition, if the electric quantity of the terminal is more than or equal to 60 percent (which indicates that the current electric quantity of the terminal is sufficient, the downlink data sent by the base station can be received by simultaneously opening two radio frequency channels, so that the success probability of receiving the downlink data is improved, under normal conditions, in order to increase the standby time of the terminal, the terminal only uses one radio frequency channel to communicate with the base station), the terminal reports first-class downlink sending beam description information of the base station, which can be received by the terminal, to the base station, wherein the first-class downlink sending beam description information at least comprises 4 downlink sending beam identifications of the base station, the receiving quality intensity corresponding to each downlink sending beam, the radio frequency channel identification information of the downlink receiving beam of the terminal corresponding to the downlink sending beam, and interference information among the downlink four sending beams (the interference information is used for helping the base station to use interference among each other when the terminal sends a retransmission The smallest downlink transmission beam), the 4 downlink transmission beams are respectively called a first downlink transmission beam, a second downlink transmission beam, a third downlink transmission beam and a fourth downlink transmission beam from top to bottom according to the intensity of the reception quality, the downlink reception beam of the terminal corresponding to the first downlink transmission beam is called a first downlink reception beam, the downlink reception beam of the terminal corresponding to the second downlink transmission beam is called a second downlink reception beam, the downlink reception beam of the terminal corresponding to the third downlink transmission beam is called a third downlink reception beam, the downlink reception beam of the terminal corresponding to the fourth downlink transmission beam is called a fourth downlink reception beam, at least one downlink reception beam of the first downlink reception beam, the second downlink reception beam, the third downlink reception beam and the fourth downlink reception beam is formed based on the first radio frequency channel, at least one downlink receiving beam is formed based on the second radio frequency channel, so that the purpose of reporting is to ensure that the terminal can receive the retransmission packet sent by the plurality of downlink transmitting beams when the base station sends the retransmission packet to the terminal through the plurality of downlink transmitting beams.

If the power of the terminal is less than 60%, the terminal reports to the base station second type downlink transmission beam description information of the base station that the terminal can receive, wherein the second type downlink transmission beam description information at least includes 2 downlink transmission beam identifiers of the base station and a reception quality intensity corresponding to each downlink transmission beam, wherein the 2 downlink transmission beams are respectively called a fifth downlink transmission beam and a sixth downlink transmission beam from top to bottom according to the reception quality intensity, a downlink reception beam of the terminal corresponding to the fifth downlink transmission beam is called a fifth downlink reception beam, a downlink reception beam of the terminal corresponding to the sixth downlink transmission beam is called a sixth downlink reception beam, and the fifth downlink reception beam and the sixth downlink reception beam are formed based on the same radio frequency channel.

If the base station receives the first type downlink transmission beam description information, the base station uses the first downlink transmission beam to transmit a physical downlink control channel to the terminal, and uses the first downlink transmission beam to transmit a service information first transmission packet to the terminal based on the configuration information carried by the physical downlink control channel; if the base station receives the second type downlink transmission beam description information, the base station uses a fifth downlink transmission beam to transmit a physical downlink control channel to the terminal, and uses the fifth downlink transmission beam to transmit a service information initial transmission packet to the terminal based on configuration information carried by the physical downlink control channel, wherein the physical downlink control channel comprises the configuration information of the service information initial transmission packet transmitted by the base station to the terminal, and the configuration information comprises: the base station sends coding information used by the service information to the terminal (for example, the service information is coded by using an LDPC code, or a TURBO code, or a POLAR code, and modulation information, the terminal can determine a reference signal-to-noise ratio required for successfully receiving a first-pass packet based on the information), and the terminal is used for sending a first feedback resource and a second feedback resource of the service information success or failure information.

If the terminal sends first-class downlink sending beam description information before, the terminal receives a physical downlink control channel by using a first downlink receiving beam corresponding to the first downlink sending beam, and receives a service information initial transmission packet by using the first downlink receiving beam according to configuration information carried by the physical downlink control channel, if the terminal fails to decode the service information initial transmission packet successfully, and the difference between the receiving signal-to-noise ratio of the service information initial transmission packet and a reference signal-to-noise ratio calculated according to the configuration information is not more than 1.5dB, the terminal sends receiving failure information to a base station by using a first feedback resource according to the first uplink sending beam corresponding to the first downlink receiving beam, so that the quality of a beam link used by the base station and the terminal is good, and the probability that the terminal successfully receives the retransmission packet by continuously using the beam link is very high; if the terminal fails to successfully decode the service information first-transmission packet, and the difference between the receiving signal-to-noise ratio of the service information first-transmission packet and the reference signal-to-noise ratio calculated according to the coding information carried by the configuration information is greater than 1.5dB and less than 6dB, the terminal sends the receiving failure information to the base station by using a second feedback resource according to a first uplink sending beam corresponding to a first downlink receiving beam, the reason for doing so is that the quality of a beam link used by the base station and the terminal is poor at the moment, the probability that the base station continues to use the beam link to send the retransmission packet so that the terminal successfully receives is also low, and the terminal needs to use the second feedback resource to inform the base station that a new beam link needs to be used to send the retransmission packet so as to improve; if the terminal fails to successfully decode the service information initial transmission packet, and the difference between the receiving signal-to-noise ratio of the service information initial transmission packet and the reference signal-to-noise ratio calculated according to the coding information carried by the configuration information is larger than 6dB, the terminal uses a first feedback resource to send the receiving failure information to the base station according to a first uplink transmission beam corresponding to a first downlink reception beam, the terminal uses a downlink transmission beam with the strongest receiving quality corresponding to another radio frequency channel of the terminal according to the downlink transmission beam description information to determine an uplink transmission beam corresponding to the downlink reception beam, and uses the uplink transmission beam to send the receiving failure information to the base station on a second feedback resource.

If the terminal sends the second-type downlink sending beam description information before, the terminal receives a physical downlink control channel by using a fifth downlink receiving beam corresponding to the fifth downlink sending beam, and receives a service information initial transmission packet by using the fifth downlink receiving beam according to configuration information carried by the physical downlink control channel, if the terminal fails to decode the service information initial transmission packet successfully, and the difference between the receiving signal-to-noise ratio of the service information initial transmission packet and a reference signal-to-noise ratio calculated according to the configuration information is not more than 1.5dB, the terminal sends receiving failure information to the base station by using a first feedback resource according to the fifth uplink sending beam corresponding to the fifth downlink receiving beam, so that the quality of a beam link used by the base station and the terminal is good, and the probability that the terminal successfully receives the retransmission packet by continuously using the beam link is very high; if the terminal fails to decode the service information first-transmission packet successfully, and the difference between the receiving signal-to-noise ratio of the service information first-transmission packet and the reference signal-to-noise ratio calculated according to the coding information carried by the configuration information is greater than 1.5dB, the terminal sends the receiving failure information to the base station by using the second feedback resource according to the sixth uplink sending beam corresponding to the sixth downlink receiving beam, the reason for doing so is that the quality of the beam link used by the base station and the terminal is poor, the probability that the terminal successfully receives is low as the base station continues to use the beam link to send the retransmission packet, and the terminal needs to use the second feedback resource to inform the base station that a new beam link needs to be used to send the retransmission packet, so that the probability that the terminal successfully receives.

If the base station receives the first type of downlink transmission beam description information before and the base station receives the reception failure information only on the first feedback resource, the base station continues to use the first downlink transmission beam to transmit a retransmission packet of the service information to the terminal; if the base station receives the first type downlink transmission beam description information before and only receives the reception failure information on the second feedback resource, the base station uses the first downlink transmission beam to transmit the retransmission packet of the service information, and uses the downlink transmission beam (called as auxiliary downlink transmission beam) with the strongest reception quality corresponding to the other radio frequency channel of the terminal to transmit the retransmission packet of the service information according to the downlink transmission beam description information, so that the advantage that the base station has two radio frequency channels can be utilized to enable the base station to simultaneously use two downlink transmission beams to transmit the retransmission packet to the terminal for the terminal with more sufficient energy, the probability of successfully receiving the retransmission packet by the terminal is improved, and the spectrum efficiency of the whole system is improved; if the base station receives the reception failure information on the first feedback resource and the second feedback resource, the base station and the terminal perform beam training again through a compressed sensing algorithm, and the base station does not send a retransmission packet of the service information to the terminal any more, wherein the number of special training beams sent by the base station to the terminal is equal to (2 × sparsity value of a beam link), and the reason for doing so is that the terminal judges that a channel between the base station and the terminal has a huge change according to the reception quality of a first-pass packet, an original beam training result is probably unavailable, and it is significant only by using a new beam training result to perform data transmission, and the new beam training uses more resources, so that the reliability of the beam training result is improved.

If the base station receives the description information of the second downlink transmission beam before and the base station receives the reception failure information only on the first feedback resource, the base station continues to use the fifth downlink transmission beam to transmit the retransmission packet of the service information to the terminal; and if the base station receives the second type downlink transmission beam description information before and only receives the reception failure information on the second feedback resource, the base station uses a sixth downlink transmission beam to transmit a retransmission packet of the service information.

If the terminal sends the first-class downlink transmission beam description information before and sends the reception failure information on the first feedback resource, the terminal receives a retransmission packet of the service information sent by the base station by using a first downlink reception beam, and if the retransmission packet of the service information is successfully received, the terminal sends the reception success information to the base station by using the first feedback resource according to a first uplink transmission beam corresponding to the first downlink reception beam; if the retransmission packet of the service information is received unsuccessfully, the terminal sends the reception failure information to the base station on the second feedback resource according to the first uplink transmission beam corresponding to the first downlink reception beam, and sends the reception failure information to the base station on the second feedback resource according to the uplink transmission beam corresponding to the downlink reception beam corresponding to the auxiliary downlink transmission beam.

If the terminal sends the second type downlink sending beam description information before and sends the receiving failure information on the first feedback resource, the terminal receives a retransmission packet of the service information sent by the base station by using a fifth downlink receiving beam, and if the retransmission packet of the service information is successfully received, the terminal sends the receiving success information to the base station by using the first feedback resource according to a fifth uplink sending beam corresponding to the fifth downlink receiving beam; if the retransmission packet of the service information is failed to be received, the terminal sends the reception failure information to the base station at the second feedback resource according to the sixth uplink transmission beam corresponding to the sixth downlink reception beam.

If the terminal which previously sends the description information of the first type of downlink transmission beam sends the reception failure information on the second feedback resource, the terminal uses the downlink reception beam corresponding to the first downlink reception beam and the auxiliary downlink transmission beam to receive the retransmission packet of the service information sent by the base station (the advantage of this is that the terminal receives the retransmission packet sent by the base station through the two reception beams, the probability of successful reception can be effectively improved); and if the retransmission packet of the service information is failed to be received, the terminal sends the receiving failure information to the base station in the second feedback resource according to the first uplink sending beam corresponding to the first downlink receiving beam, and sends the receiving failure information to the base station in the second feedback resource according to the uplink sending beam corresponding to the downlink receiving beam corresponding to the auxiliary downlink sending beam.

If the terminal which previously sends the description information of the second type downlink sending wave beam sends the receiving failure information on the second feedback resource, the terminal uses the downlink receiving wave beam corresponding to the sixth downlink receiving wave beam to receive the retransmission packet of the service information sent by the base station, and if the retransmission packet of the service information is successfully received, the terminal uses the sixth uplink sending wave beam corresponding to the sixth downlink receiving wave beam to send the receiving success information to the base station on the second feedback resource; and if the retransmission packet of the service information is failed to be received, the terminal sends the receiving failure information to the base station in the second feedback resource according to a sixth uplink sending wave beam corresponding to a sixth downlink receiving wave beam.

If the base station receives the first-class downlink transmission beam description information before and the base station receives successful receiving information of the retransmission packet of the service information on the first feedback resource or the second feedback resource, the base station does not send the service information to the terminal any more; if the base station receives the description information of the first type of downlink transmission beams before and the base station receives the failure information of the retransmission packet of the service information on the second feedback resource, if there is a downlink transmission beam corresponding to the same radio frequency channel identification information as the first downlink transmission beam among the four downlink transmission beams, the base station uses the downlink transmission beam (called a candidate downlink transmission beam) to replace the first downlink transmission beam to continue to transmit the service information retransmission packet, if there is a downlink transmission beam corresponding to the same radio frequency channel identification information as the auxiliary downlink transmission beam among the four downlink transmission beams and having the minimum interference to the candidate downlink transmission beam (this is advantageous by replacing the original beam pair, selecting the beam pair with the minimum interference to communicate and improving the probability of the terminal successfully receiving the retransmission packet as much as possible), the base station uses the downlink transmission beam to replace the auxiliary downlink transmission beam to continue to transmit the service information retransmission packet, until receiving the successful receiving information of the retransmission packet of the service information sent by the terminal.

If the base station receives the second type downlink transmission beam description information before and the base station receives the retransmission packet receiving success information of the service information on the first feedback resource or the second feedback resource, the base station does not send the service information to the terminal any more; if the base station receives the second type downlink transmission beam description information before and the base station receives retransmission packet reception failure information of the service information on the second feedback resource, the terminal transmits beam training request information to the base station to require the base station to perform beam pairing with the base station again.

Example 2:

on the basis of embodiment 1, when the terminal sends the reception failure information to the base station using the second feedback resource according to the first uplink transmission beam corresponding to the first downlink reception beam, the terminal starts another radio frequency channel to operate at the same time. The reason for this is that if the quality of the beam link between the base station and the terminal is good, the terminal can use only one radio frequency channel as much as possible, and the other radio frequency channel is closed, so that the purpose of saving power is achieved. However, when there is a problem in the beam link between the terminal and the base station, another radio frequency channel needs to be started in time for auxiliary beam transmission to ensure the reliability of data communication.

Example 3:

in addition to embodiment 1, when the first downlink transmission beam transmits a retransmission packet of the service information, the same resources as those used when the auxiliary downlink transmission beam transmits the retransmission packet are used. The method has the advantages of saving precious air interface resources as much as possible and improving the frequency spectrum efficiency of downlink data transmission of the whole system.

Example 4:

in addition to embodiment 1, when the first downlink transmission beam transmits a retransmission packet of the service information, the resource and sequence of the demodulation reference channel used when the auxiliary downlink transmission beam transmits the retransmission packet are the same. The reason for this is that the orthogonality between the two beam links is very good, and no interference can be achieved, thereby reducing the pilot overhead and improving the spectrum efficiency of data transmission.

Example 5:

on the basis of embodiment 1, if the base station receives the reception failure information on the second feedback resource, the base station transmits the physical downlink control channel using the auxiliary downlink transmission beam. The method has the advantages that the base station receives the receiving failure information on the second feedback resource, which shows that the performance of the beam link formed by the original first downlink transmitting beam and the original first downlink receiving beam is very poor, and if the base station continues to use the beam link to communicate with the terminal, the terminal has a high probability that the terminal cannot receive the information transmitted by the base station to the terminal, so that the base station is replaced to another beam link to carry out communication between the base station and the terminal, and the reliability of control channel transmission between the base station and the terminal is ensured as much as possible.

Example 6:

in addition to embodiment 5, the terminal receives the physical downlink control information according to the downlink receive beam corresponding to the auxiliary downlink transmit beam, and receives the retransmission packet of the service information transmitted by the first downlink transmit beam and the auxiliary downlink transmit beam according to the configuration information of the physical downlink control information. The advantage of this is that the base station sends the same retransmission packet to the terminal through the two beam links, which improves the reliability of downlink data reception.

Example 7:

on the basis of embodiment 1, if the base station receives the reception failure information on the second feedback resource, the base station simultaneously transmits the physical downlink control channel using the first downlink transmission beam and the auxiliary downlink transmission beam. The method has the advantages that the base station receives the receiving failure information on the second feedback resource, which shows that the performance of the beam link formed by the original first downlink transmitting beam and the original first downlink receiving beam is very poor, if the base station continues to use the beam link to communicate with the terminal, the terminal has a very high probability that the terminal cannot receive the information transmitted to the terminal by the base station, and needs to transmit the downlink control channel through the two beam links, so that the receiving reliability of the downlink control channel is improved.

Example 8:

based on embodiment 1, an "incremental redundancy" coding scheme is used between the first packet of the service information and the retransmission packet of the service information. This has the benefit of increasing the coding gain for data reception.

Example 9:

on the basis of embodiment 1, when the base station sends the retransmission packet of the service information to the terminal for the second time, the time-frequency resource used by the base station to send the retransmission packet is twice as much as that used by the base station to send the first transmission packet. The purpose of this is to ensure that the terminal can receive the retransmitted packet as successfully as possible when receiving the retransmitted packet for the second time by increasing the transmission resources.

Example 10:

on the basis of the embodiment 1, when the terminal uses the second feedback resource to transmit the information of the success or failure of the service information reception, the transmission power of the terminal is increased by 3dB compared with the case that the terminal uses the first feedback resource to transmit the information of the success or failure of the service information reception. The advantage of this is that the terminal sends the reception failure information on the second feedback resource, which indicates that the beam link formed by the original first downlink transmission beam and the first downlink reception beam has very poor performance, and needs to replace a new beam link, and in order to ensure the reliability of the new beam link in transmitting the control information, the transmission power of the terminal needs to be increased.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A data sending method in a narrow-band Internet of things is characterized by comprising the following steps:

2. The method for sending data in the narrowband internet of things according to claim 1, wherein the sparsity value of the beam link is N × M/10, where N is the number of downlink transmission beams of a base station, M is the number of downlink reception beams of a terminal, the base station performs beam training based on a compressive sensing algorithm with the terminal according to the sparsity information of the beam link, and the number of special training beams sent by the base station to the terminal is equal to the sparsity value of the beam link;

3. The method for sending data in a narrowband internet of things as claimed in claim 2, wherein the step S2 includes the following steps:

4. The method according to claim 3, wherein the physical downlink control channel includes configuration information of a service information first-pass packet sent by the base station to the terminal, the configuration information includes coding information used by the base station to send the service information to the terminal and the feedback resource information used by the terminal to send the service information success or failure information, and the feedback resource information includes a first feedback resource and a second feedback resource.

5. The method for sending data in a narrowband internet of things as claimed in claim 4, wherein the step S3 includes the following steps:

6. The method for sending data in a narrowband internet of things as claimed in claim 5, wherein the step S4 includes the following steps:

7. The method for sending data in a narrowband internet of things as claimed in claim 6, wherein the step S5 includes the following steps:

8. The method for sending data in a narrowband internet of things as claimed in claim 7, wherein the step S5 further comprises the following steps:

9. The method for sending data in a narrowband internet of things according to any one of claims 1 to 8, wherein when the terminal sends reception failure information to the base station using the second feedback resource according to a first uplink transmission beam corresponding to the first downlink reception beam, the terminal starts another radio frequency channel to operate at the same time; when the first downlink transmission beam transmits the retransmission packet of the service information, the resource used by the first downlink transmission beam is the same as the resource used by the auxiliary downlink transmission beam to transmit the retransmission packet; when the first downlink transmission beam transmits the retransmission packet of the service information, the resource and the sequence of the demodulation reference channel used when the auxiliary downlink transmission beam transmits the retransmission packet are the same.

10. The method for sending data in the narrowband internet of things according to any one of claims 1 to 8, wherein an incremental redundancy coding mode is used between a first transmission packet of the service information and a retransmission packet of the service information; when the base station sends the service information retransmission packet to the terminal for the second time, the time-frequency resource used by the base station for sending the service information retransmission packet is twice that of the time-frequency resource used by the base station for sending the first transmission packet; when the terminal uses the second feedback resource to send the information of the successful or failed receiving of the service information, the sending power of the terminal is increased by 3dB compared with the situation that the terminal uses the first feedback resource to send the information of the successful or failed receiving of the service information.