CN110972117A - Internet of things data transmission method based on wave beams - Google Patents
Internet of things data transmission method based on wave beams Download PDFInfo
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- CN110972117A CN110972117A CN201911119135.9A CN201911119135A CN110972117A CN 110972117 A CN110972117 A CN 110972117A CN 201911119135 A CN201911119135 A CN 201911119135A CN 110972117 A CN110972117 A CN 110972117A
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- downlink
- information
- terminal
- base station
- service information
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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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
Abstract
The invention provides a data transmission method of the Internet of things based on beams, wherein a terminal sends downlink beam description information to a base station; the base station sends a physical downlink control channel to the terminal by using a downlink sending wave beam and sends a first transmission packet to the terminal; 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; after receiving the feedback resource information sent by the terminal, the base station sends a retransmission packet; and the terminal sends feedback resource information for receiving the retransmission packet to the base station, if the retransmission packet is successfully sent, the base station does not send the feedback resource information to the terminal, and if the retransmission packet is unsuccessfully sent, the downlink transmission beam of the same radio frequency channel as the downlink transmission beam of the information transmitted before is selected to continue sending the retransmission packet until the information which is successfully received by the retransmission packet sent by the terminal is received. 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
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a data transmission method of an Internet of things based on beams.
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, one scenario to be studied is the problem of efficient and reliable transmission of data in the internet of things that use high frequency bands 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 internet of things system is urgently needed.
Disclosure of Invention
The invention aims to provide a data transmission method of the Internet of things based on beams, 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 transmission method of the internet of things based on wave beams comprises the following steps:
s1: the terminal sends downlink beam description information to the base station;
s2: the base station sends a physical downlink control channel to the terminal by using the downlink sending wave beam, and sends a service information first transmission packet to the terminal by using the downlink sending wave beam based on configuration information carried by the physical downlink control channel;
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 for receiving the service information retransmission packet to the base station, if the service information retransmission packet is successfully sent, the base station does not send the service information to the terminal any more, and if the service information retransmission packet is unsuccessfully sent, the downlink sending wave beam of the same radio frequency channel as the downlink sending wave beam of the previously transmitted information is selected to continue sending the service information retransmission packet until the retransmission packet receiving the service information sent by the terminal receives the successful information.
The further technical scheme of the invention is as follows: the description information of the downlink transmission beam includes four downlink transmission beams, a reception quality intensity corresponding to each downlink transmission beam, and radio frequency channel identification information of a downlink reception beam of the terminal corresponding to the downlink transmission beam, 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 intensities, a downlink reception beam of the terminal corresponding to the first downlink transmission beam is called a first downlink reception beam, a downlink reception beam of the terminal corresponding to the second downlink transmission beam is called a second downlink reception beam, a downlink reception beam of the terminal corresponding to the third downlink transmission beam is called a third downlink reception beam, and a downlink reception beam of the terminal corresponding to the fourth downlink transmission beam is called a fourth downlink reception beam, the radio frequency channels include a first radio frequency channel and a second radio frequency channel, 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 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 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 not more than 1.5dB, sending failure information to the base station by using the first feedback resource according to the first uplink sending wave beam;
s32: and if the terminal fails to decode after receiving the 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 more than 1.5dB, sending failure information to the base station by using the second feedback resource according to the first 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 failure information on the first feedback resource, the base station continues to use the first downlink transmission beam to transmit a service information retransmission packet;
s42: and if the base station receives the failure information on the second feedback resource, the base station transmits a service information retransmission packet by using a next downlink transmission beam with strong reception quality intensity in the downlink transmission beams, wherein the next downlink transmission beam with strong reception quality intensity in the downlink transmission beams is called as an auxiliary downlink transmission beam.
The further technical scheme of the invention is as follows: the step S5 includes the steps of:
s51: if the terminal 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 the first downlink receiving beam, and if the retransmission packet of the service information is successfully received, the terminal sends receiving success information to the base station by using the first feedback resource according to a first uplink sending beam corresponding to the first downlink receiving beam; if the retransmission packet of the service information is failed to be received, the terminal sends receiving failure information to the base station at the second feedback resource according to the first uplink sending beam corresponding to the first downlink receiving beam, and sends receiving failure information to the base station at the second feedback resource according to the uplink sending beam corresponding to the downlink receiving beam corresponding to the auxiliary downlink sending beam;
s52: if the terminal sends the reception failure information on the second feedback resource, the terminal receives a retransmission packet of the service information sent by the base station by using downlink receiving beams corresponding to the first downlink receiving beam and the auxiliary downlink sending 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 uplink sending beams corresponding to the first uplink sending beam corresponding to the first downlink receiving beam and the downlink receiving beam corresponding to the auxiliary downlink sending beam 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 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.
The further technical scheme of the invention is as follows: the step S5 further includes the steps of:
s53: if 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 packet to the terminal any more;
s54: and if the base station receives the retransmission packet reception failure information of the service information on the second feedback resource, replacing the first downlink transmission beam with a downlink transmission beam of the four downlink transmission beams corresponding to the same radio frequency channel identification information as the first downlink transmission beam to continuously transmit the service information retransmission packet, and if the four downlink transmission beams have a downlink transmission beam of the same radio frequency channel identification information as the auxiliary downlink transmission beam, replacing the auxiliary downlink transmission beam with the downlink transmission beam by the base station to continuously transmit the service information retransmission packet until the retransmission packet reception success information of the service information transmitted by the terminal is received.
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 S3 of the method of the present invention;
FIG. 3 is a flow chart of step S4 of the method of the present invention;
FIG. 4 is a first flowchart of step S5 of the method of the present invention;
fig. 5 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 of the internet of things based on beams, which is provided by the invention and comprises the following steps:
s1: the terminal sends downlink beam description information to the base station;
s2: the base station sends a physical downlink control channel to the terminal by using the downlink sending wave beam, and sends a service information first transmission packet to the terminal by using the downlink sending wave beam based on configuration information carried by the physical downlink control channel;
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 for receiving the service information retransmission packet to the base station, if the service information retransmission packet is successfully sent, the base station does not send the service information to the terminal any more, and if the service information retransmission packet is unsuccessfully sent, the downlink sending wave beam of the same radio frequency channel as the downlink sending wave beam of the previously transmitted information is selected to continue sending the service information retransmission packet until the retransmission packet receiving the service information sent by the terminal receives the successful information.
Preferably, the description information of the downlink transmission beam includes four downlink transmission beams, a reception quality strength corresponding to each downlink transmission beam, and radio frequency channel identification information of a downlink reception beam of the terminal corresponding to the downlink transmission beam, 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 strengths, 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, and the downlink reception beam of the terminal corresponding to the fourth downlink transmission beam is called a fourth downlink reception beam, the radio frequency channels include a first radio frequency channel and a second radio frequency channel, 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.
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. 2, preferably, the step S3 includes the following steps:
s31: 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 not more than 1.5dB, sending failure information to the base station by using the first feedback resource according to the first uplink sending wave beam;
s32: and if the terminal fails to decode after receiving the 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 more than 1.5dB, sending failure information to the base station by using the second feedback resource according to the first uplink transmission beam.
As shown in fig. 3, preferably, the step S4 includes the following steps:
s41: if the base station receives failure information on the first feedback resource, the base station continues to use the first downlink transmission beam to transmit a service information retransmission packet;
s42: and if the base station receives the failure information on the second feedback resource, the base station transmits a service information retransmission packet by using a next downlink transmission beam with strong reception quality intensity in the downlink transmission beams, wherein the next downlink transmission beam with strong reception quality intensity in the downlink transmission beams is called as an auxiliary downlink transmission beam.
As shown in fig. 4, preferably, the step S5 includes the following steps:
s51: if the terminal 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 the first downlink receiving beam, and if the retransmission packet of the service information is successfully received, the terminal sends receiving success information to the base station by using the first feedback resource according to a first uplink sending beam corresponding to the first downlink receiving beam; if the retransmission packet of the service information is failed to be received, the terminal sends receiving failure information to the base station at the second feedback resource according to the first uplink sending beam corresponding to the first downlink receiving beam, and sends receiving failure information to the base station at the second feedback resource according to the uplink sending beam corresponding to the downlink receiving beam corresponding to the auxiliary downlink sending beam;
s52: if the terminal sends the reception failure information on the second feedback resource, the terminal receives a retransmission packet of the service information sent by the base station by using downlink receiving beams corresponding to the first downlink receiving beam and the auxiliary downlink sending 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 uplink sending beams corresponding to the first uplink sending beam corresponding to the first downlink receiving beam and the downlink receiving beam corresponding to the auxiliary downlink sending beam 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 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.
As shown in fig. 5, preferably, the step S5 further includes the following steps:
s53: if 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 packet to the terminal any more;
s54: and if the base station receives the retransmission packet reception failure information of the service information on the second feedback resource, replacing the first downlink transmission beam with a downlink transmission beam of the four downlink transmission beams corresponding to the same radio frequency channel identification information as the first downlink transmission beam to continuously transmit the service information retransmission packet, and if the four downlink transmission beams have a downlink transmission beam of the same radio frequency channel identification information as the auxiliary downlink transmission beam, replacing the auxiliary downlink transmission beam with the downlink transmission beam by the base station to continuously transmit the service information retransmission packet until the retransmission packet reception success information of the service information transmitted by the terminal is received.
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:
reporting downlink transmission beam description information of a base station which can be received by a terminal to the base station by a terminal supporting a first radio frequency channel and a second radio frequency channel (which is required to be explained that only one radio frequency channel of the terminal works at the moment, so that the terminal can save electricity and increase standby time), wherein the downlink transmission beam description information at least comprises 4 downlink transmission beam identifications of the base station, the reception quality intensity corresponding to each downlink transmission beam and the radio frequency channel identification information of a downlink reception beam of the terminal corresponding to the 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 reception quality intensity, the downlink reception beam of the terminal corresponding to the first downlink transmission beam is called a first downlink reception beam, and the downlink reception beam of the terminal corresponding to the second downlink transmission beam is called a second downlink reception beam, the downlink receiving beam of the terminal corresponding to the third downlink transmitting beam is called a third downlink receiving beam, the downlink receiving beam of the terminal corresponding to the fourth downlink transmitting beam is called a fourth downlink receiving beam, at least one of the first downlink receiving beam, the second downlink receiving beam, the third downlink receiving beam and the fourth downlink receiving beam is formed based on the first radio frequency channel, and at least one of the downlink receiving beams is formed based on the second radio frequency channel. In addition, the terminal can also use two radio frequency channels to send feedback information to the base station, thereby improving the reliability of the feedback information.
After receiving the downlink transmission beam description information, the base station transmits a physical downlink control channel to the terminal by using a first downlink transmission beam, and transmits a service information initial transmission packet to the terminal by using the first downlink transmission beam 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 (for example, an LDPC code, a Turbo code, a Polar code, and a modulation mode are used to inform the terminal of downlink data use) to the terminal, and the terminal is used to send a first feedback resource and a second feedback resource of the success or failure information of the service information. The advantage of this is that the terminal determines the feedback resource for sending the feedback information according to the receiving quality of the first-pass packet, and the base station can be informed whether to use an additional downlink sending beam to send downlink data by sending the feedback information on different feedback resources.
The terminal receives a physical downlink control channel by using a first downlink receiving beam corresponding to a first downlink transmitting 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 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 a reference signal-to-noise ratio calculated according to the configuration information is not more than 1.5dB, which indicates that a beam link between the base station and the terminal is relatively normal at the moment, and the probability of successful receiving is very high when the beam link is continuously used for transmitting a retransmission packet to the terminal, the terminal transmits receiving failure information to the base station by using a first feedback resource according to the first uplink transmitting beam corresponding to the first downlink receiving beam; 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 the reference signal-to-noise ratio calculated according to the coding information carried by the configuration information is larger than 1.5dB, which indicates that the quality of the beam link between the base station and the terminal is poor at this time, the probability of successful reception when the beam link is continuously used to transmit the retransmission packet to the terminal is very small, the terminal needs to start another radio frequency channel to receive downlink data transmitted by the base station, the base station needs to additionally use a downlink transmission beam corresponding to the downlink reception beam generated by the radio frequency channel to transmit the retransmission packet to the terminal, and the terminal uses a second feedback resource to transmit reception failure information to the base station according to a first uplink transmission beam corresponding to the first downlink reception beam.
If the base station receives the receiving failure information 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; and if the base station 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 a downlink transmission beam (called as an 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. The advantage of this is to determine whether to add a new beam to transmit the retransmission packet according to the condition that the terminal receives the first transmission packet, and reduce the power consumption of the terminal as much as possible while improving the data transmission efficiency.
If the terminal sends the receiving failure information on the first feedback resource, the terminal uses a first downlink receiving beam to receive a 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 sends the receiving success information to the base station according to the first uplink sending beam corresponding to the first downlink receiving beam by using the first 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 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. The reason for this is that if the channel quality is good when the terminal fails to receive the first-transmitted packet, the base station continues to use only the first downlink transmission beam to transmit the retransmission packet to the terminal, but the terminal still does not successfully receive the retransmission packet, which indicates that the link between the terminal and the base station is continuously deteriorated, which may cause that the base station cannot receive the feedback information transmitted from the terminal to the base station, so that the terminal opens another radio frequency channel to generate a new uplink transmission beam to repeatedly transmit the feedback information, and the probability that the base station successfully receives the reception failure feedback information transmitted by the terminal is improved as much as possible.
If the terminal sends the receiving failure information on the second feedback resource, the terminal receives a retransmission packet of the service information sent by the base station by using a downlink receiving beam corresponding to the first downlink receiving beam and the auxiliary downlink sending 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 a first uplink sending beam corresponding to the first downlink receiving beam and an uplink sending beam corresponding to a downlink receiving beam corresponding to the auxiliary downlink sending beam on the second feedback resource, so that the base station can be ensured to successfully receive the retransmission packet sent by the terminal and receive the successful feedback information; 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 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 failure information of receiving the retransmission packet of the service information on the second feedback resource, if the four downlink transmission beams have the downlink transmission beam corresponding to the same radio frequency channel identification information as the first downlink transmission beam, the base station uses the downlink transmission beam to replace the first downlink transmission beam to continuously transmit the service information retransmission packet, and if the four downlink transmission beams have the downlink transmission beam corresponding to the same radio frequency channel identification information as the auxiliary downlink transmission beam, the base station uses the downlink transmission beam to replace the auxiliary downlink transmission beam to continuously transmit the service information retransmission packet until the retransmission packet of the service information transmitted by the terminal is received successfully. The advantage of this is that the first transmission and the first retransmission indicate that the beam link used by the base station and the terminal for transmitting data has problems (mainly because the beam link used by the high frequency system is very sensitive to obstacles and environmental changes), and the reliability of data transmission needs to be improved by replacing the new beam link.
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 (9)
1. A data transmission method of the Internet of things based on beams is characterized by comprising the following steps:
s1: the terminal sends downlink beam description information to the base station;
s2: the base station sends a physical downlink control channel to the terminal by using the downlink sending wave beam, and sends a service information first transmission packet to the terminal by using the downlink sending wave beam based on configuration information carried by the physical downlink control channel;
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 for receiving the service information retransmission packet to the base station, if the service information retransmission packet is successfully sent, the base station does not send the service information to the terminal any more, and if the service information retransmission packet is unsuccessfully sent, the downlink sending wave beam of the same radio frequency channel as the downlink sending wave beam of the previously transmitted information is selected to continue sending the service information retransmission packet until the retransmission packet receiving the service information sent by the terminal receives the successful information.
2. The method of claim 1, wherein the description information of the downlink transmission beam includes four downlink transmission beams, a reception quality intensity corresponding to each downlink transmission beam, and radio frequency channel identification information of a downlink reception beam of the terminal corresponding to the downlink transmission beam, 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 intensities, 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 downlink receiving beam of the terminal corresponding to the fourth downlink transmitting beam is referred to as a fourth downlink receiving beam, the radio frequency channel includes a first radio frequency channel and a second radio frequency channel, at least one of the first downlink receiving beam, the second downlink receiving beam, the third downlink receiving beam and the fourth downlink receiving beam is formed based on the first radio frequency channel, and at least one downlink receiving beam is formed based on the second radio frequency channel.
3. The method of claim 2, 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.
4. The method for transmitting data of the internet of things based on the beam as claimed in claim 3, wherein the step S3 includes the following steps:
s31: 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 not more than 1.5dB, sending failure information to the base station by using the first feedback resource according to the first uplink sending wave beam;
s32: and if the terminal fails to decode after receiving the 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 more than 1.5dB, sending failure information to the base station by using the second feedback resource according to the first uplink transmission beam.
5. The method for transmitting data of the internet of things based on the beam as claimed in claim 4, wherein the step S4 includes the following steps:
s41: if the base station receives failure information on the first feedback resource, the base station continues to use the first downlink transmission beam to transmit a service information retransmission packet;
s42: and if the base station receives the failure information on the second feedback resource, the base station transmits a service information retransmission packet by using a next downlink transmission beam with strong reception quality intensity in the downlink transmission beams, wherein the next downlink transmission beam with strong reception quality intensity in the downlink transmission beams is called as an auxiliary downlink transmission beam.
6. The method for transmitting data of the internet of things based on the beam as claimed in claim 5, wherein the step S5 includes the following steps:
s51: if the terminal 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 the first downlink receiving beam, and if the retransmission packet of the service information is successfully received, the terminal sends receiving success information to the base station by using the first feedback resource according to a first uplink sending beam corresponding to the first downlink receiving beam; if the retransmission packet of the service information is failed to be received, the terminal sends receiving failure information to the base station at the second feedback resource according to the first uplink sending beam corresponding to the first downlink receiving beam, and sends receiving failure information to the base station at the second feedback resource according to the uplink sending beam corresponding to the downlink receiving beam corresponding to the auxiliary downlink sending beam;
s52: if the terminal sends the reception failure information on the second feedback resource, the terminal receives a retransmission packet of the service information sent by the base station by using downlink receiving beams corresponding to the first downlink receiving beam and the auxiliary downlink sending 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 uplink sending beams corresponding to the first uplink sending beam corresponding to the first downlink receiving beam and the downlink receiving beam corresponding to the auxiliary downlink sending beam 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 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.
7. The method for transmitting data of the internet of things based on the beam as claimed in claim 6, wherein the step S5 further comprises the steps of:
s53: if 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 packet to the terminal any more;
s54: and if the base station receives the retransmission packet reception failure information of the service information on the second feedback resource, replacing the first downlink transmission beam with a downlink transmission beam of the four downlink transmission beams corresponding to the same radio frequency channel identification information as the first downlink transmission beam to continuously transmit the service information retransmission packet, and if the four downlink transmission beams have a downlink transmission beam of the same radio frequency channel identification information as the auxiliary downlink transmission beam, replacing the auxiliary downlink transmission beam with the downlink transmission beam by the base station to continuously transmit the service information retransmission packet until the retransmission packet reception success information of the service information transmitted by the terminal is received.
8. The method for transmitting data of the internet of things based on the beams as claimed in any one of claims 1 to 7, wherein when the terminal transmits 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 operate; 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.
9. The method for transmitting data of the internet of things based on the beam as claimed in any one of claims 1 to 7, wherein 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.
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