CN109861805B

CN109861805B - Data transmission method in narrow-band Internet of things based on beam sensing

Info

Publication number: CN109861805B
Application number: CN201910040555.1A
Authority: CN
Inventors: 王洋; 张娅琳
Original assignee: Shenzhen Polytechnic
Current assignee: Shenzhen Polytechnic
Priority date: 2019-01-16
Filing date: 2019-01-16
Publication date: 2020-07-07
Anticipated expiration: 2039-01-16
Also published as: CN109861805A

Abstract

The invention provides a data transmission method in a narrow-band Internet of things based on beam sensing, and belongs to the field of wireless communication. The invention comprises the following steps: the base station sends first configuration information and a downlink channel state information reference signal CSI-RS1 to a terminal located at a geographic position X; the terminal receives the first configuration information; the base station sends second configuration information to the terminal; the terminal receives the second configuration information and sends data according to the second configuration information; if the transmission fails, the base station transmits beam configuration information and beams; and the terminal successfully senses, the base station activates and senses the relay node in the beam coverage range, and the terminal sends data to the base station through the relay node. The invention has the beneficial effects that: the problem of poor spectrum efficiency in the existing narrowband Internet of things is solved, and the capacity of the narrowband Internet of things system is improved.

Description

Data transmission method in narrow-band Internet of things based on beam sensing

Technical Field

The invention relates to the field of wireless communication, in particular to a data transmission method in a narrow-band Internet of things based on beam sensing.

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, a scenario to be researched is a problem of reliable transmission of data in a narrowband internet of things in a TDD scenario, and a common solution mainly depends on repeated transmission of data for multiple times, which results in low spectral efficiency of the system, and how to increase spectral efficiency of a narrowband internet of things system is an important problem to be solved urgently by the internet of things system.

Disclosure of Invention

In order to solve the problem of low spectrum efficiency in the narrow-band Internet of things in the prior art, the invention provides a data transmission method in the narrow-band Internet of things based on beam sensing.

The invention comprises the following steps:

s1: the base station sends first configuration information and a downlink channel state information reference signal CSI-RS1 to a terminal located at a geographic position X, wherein the first configuration information at least comprises: receiving antenna number information of the base station;

s2: the terminal receives the first configuration information and determines a channel state information vector H1 according to the downlink channel state reference signal CSI-RS 1;

s3: the base station sends second configuration information to the terminal, wherein the second configuration information comprises: configuration information of a downlink channel state information reference signal CSI-RS2, first shared resource information, second sounding reference signal resource set information and second sounding reference signal sequence set information corresponding to the second shared resource, third shared resource information, spreading sequence set information when data is sent by using the third shared resource, and over-strong indication information sending resource information;

s4: the terminal receives the second configuration information, when the terminal has data to send, the terminal determines the current geographic position Y of the terminal, the terminal determines a channel state information vector H2 according to the configuration information of the downlink channel state information reference signal CSI-RS2, and determines a data sending mode according to the current geographic position Y or the channel state information vector H2;

s5: the terminal sends data according to the sequence with the priority as the first shared resource, the second shared resource and the third shared resource until the data is sent successfully, and if the terminal does not receive the successful receiving information fed back by the base station after sending the data by using the third shared resource, the terminal sends the resource information according to the over-collision indication information and sends the over-collision indication information to the base station;

s6: after receiving the over-collision indication information, the base station sends beam configuration information and (2 × M) beams corresponding to the beam configuration information, where M is the number of antennas, and the beam configuration information includes: the terminal sends feedback resources required by feedback information to the base station after sensing the specific wave beam;

s7: after receiving the beam configuration information, the terminal which has sent the over-collision indication information tries to receive the beam, and if the sensing is successful, the terminal sends feedback information to a base station through the feedback resource, wherein the feedback information at least comprises the beam identification number information sensed by the terminal and the receiving energy information of the beam corresponding to the beam identification number;

s8: the base station determines a beam perceived by a terminal according to feedback information, the base station sends an activation signaling to a relay node located in a perceived beam coverage area in the perceived beam direction or guides a movable relay node to move to the perceived beam direction, the relay node sends confirmation information to the base station after receiving the activation information, the base station sends fourth configuration information to the terminal which has sent the over-collision indication information, and the fourth configuration information comprises system information of the relay node;

s9: and the terminal receiving the fourth configuration information accesses the relay node, communicates with the relay node and retransmits the data which is not successfully transmitted before.

In step S1, if the number M of the receiving antennas is greater than or equal to 128, the first configuration information further includes first sounding reference signal resource set information and first sounding reference signal sequence set information;

in step S2, if the first configuration information includes the first sounding reference signal resource set information and the first sounding reference signal sequence set information, the terminal determines a first sounding reference signal resource set according to the first sounding reference signal resource set information, determines a first sounding reference signal sequence set according to the first sounding reference signal sequence set information, selects a first sounding reference signal resource from the first sounding reference signal resource set by the terminal, selects a first sounding reference signal sequence from the first sounding reference signal sequence set according to the first sounding reference signal resource, and transmits the first sounding reference signal sequence on the first sounding reference signal resource by the terminal;

in step S3, the base station receives the first sounding reference signal sequence sent by the terminal, and determines a first spatial fingerprint according to the first sounding reference signal sequence; a second spatial fingerprint is determined from the second sounding reference signal sequence.

In step S4, if the distance between the geographic position Y and the geographic position X of the terminal is less than or equal to 0.3 m or the inner product of the channel state information vectors H1 and H2 is greater than or equal to 0.97, the terminal transmits the data using a first shared resource, if the distance between the geographical position Y of the terminal and the geographical position X is greater than 0.3 m and less than or equal to 1 m or the inner product of the channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9, the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determining a second sounding reference signal sequence according to the second sounding reference signal sequence set information, the terminal sends the second sounding reference signal sequence on the second sounding reference signal resource, and sends the data by using the second shared resource; if the distance between the geographic position Y and the geographic position X of the terminal is more than 1 meter or the inner product of the channel state information vectors H1 and H2 is less than 0.9, the terminal selects a spreading sequence from the spreading sequence set to spread the data, and then transmits the data by using the third shared resource.

The invention is further improved, if the terminal uses the first shared resource to transmit data, the base station receives the data based on the first spatial fingerprint; and if the terminal uses the second shared resource to send data, the base station receives the data based on a second spatial fingerprint.

In a further improvement of the present invention, the channel state information vectors H1 and H2 are M × 1-dimensional vectors, where M is the number of antennas.

In a further improvement of the present invention, the first sounding reference signal resource set is smaller than the second sounding reference signal resource set, the first sounding reference signal sequence set is smaller than the second sounding reference signal sequence set, the first shared resource and the second shared resource are equal in size, and a length N of a spreading sequence in the spreading sequence set is greater than or equal to 2M.

In a further refinement, the third shared resource is N times larger than the first shared resource.

In a further improvement of the present invention, a difference between the time domain of the downlink channel state information reference signal CSI-RS2 and the time domain of the downlink channel state information reference signal CSI-RS2 before the second shared resource is not more than 2 ms; the second sounding reference signal resource is located before the second shared resource in the time domain, and the difference is not more than 0.5 ms.

In a further improvement of the present invention, the data carries identification information of the terminal, and in step S5, the terminal sends the over-collision strength indication information using full power, where the over-collision strength indication information is a sequence shared by multiple terminals.

In a further improvement of the present invention, in step S8, the system information includes synchronization sequence information of the relay node and access resource parameter configuration information.

Compared with the prior art, the invention has the beneficial effects that: the problem of poor spectrum efficiency in the existing narrowband Internet of things is solved, and the capacity of the narrowband Internet of things system is improved; in transmission, a shared resource with stronger robustness is used for a terminal to send data, so that the hierarchical transmission of the data is realized; if the communication between the terminal and the base station fails, the data is creatively forwarded through the relay terminal, so that the reliability of data transmission is ensured, and the data transmission efficiency is improved.

Drawings

FIG. 1 is a flow chart of the method of the present invention;

FIG. 2 is a diagram illustrating a location relationship of a shared resource.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1 and 2, the present invention comprises the steps of:

The present invention will be described in detail with reference to examples.

Example 1:

the base station sends first configuration information and a downlink channel state information reference signal CSI-RS1 to a terminal located at a geographic position X, and the first configuration information at least comprises: the number of receiving antennas of the base station is information, and if the number of receiving antennas M is greater than or equal to 128, the first configuration information further includes first sounding reference signal resource set information and first sounding reference signal sequence set information. It should be noted that the more the number of receiving antennas is, the stronger the capability of the base station to distinguish the terminal through the spatial information is, and the more the available spatial fingerprint information is, so that the base station can effectively distinguish the terminal by acquiring the uplink channel of the terminal, thereby improving the spectrum efficiency of the system.

The terminal receives first configuration information, determines a channel state information vector H1 according to a downlink channel state reference signal CSI-RS1, determines a first sounding reference signal resource set according to the first sounding reference signal resource set information if the first configuration information contains the first sounding reference signal resource set information and the first sounding reference signal sequence set information, determines a first sounding reference signal sequence set according to the first sounding reference signal resource set information, selects a first sounding reference signal resource from the first sounding reference signal resource set according to the first sounding reference signal resource, selects a first sounding reference signal sequence from the first sounding reference signal sequence set according to the first sounding reference signal resource, and sends the first sounding reference signal sequence on the first sounding reference signal resource.

The base station receives a first sounding reference signal sequence sent by the terminal, and determines a first spatial fingerprint according to the first sounding reference signal sequence.

The base station sends second configuration information to the terminal, wherein the second configuration information at least comprises configuration information of a downlink channel state information reference signal CSI-RS2, first shared resource information, second sounding reference signal resource set information and second sounding reference signal sequence set information corresponding to the second shared resource, third shared resource information, spread spectrum sequence set information when the third shared resource is used for sending data, and over-strong indication information is used for sending the resource information. It should be noted that the purpose of configuring the second shared resource and the third shared resource is to allow the terminal to perform data retransmission through the second shared resource and/or the third shared resource if the base station cannot successfully receive uplink data sent by each terminal due to relatively large interference between data sent by multiple terminals on the first shared resource, and the probability of data collision on the second shared resource and the third shared resource is reduced.

The terminal receives the second configuration information, when the terminal has data to send, the terminal determines the geographical position Y of the terminal, the terminal receives the downlink channel state information reference signal CSI-RS2 according to the configuration information of the downlink channel state information reference signal CSI-RS2 to determine a channel state information vector H2, if the distance between the geographical position Y of the terminal and the geographical position X is less than or equal to 0.3 m (the distance of the terminal moving in the period is very short, and the channel state information does not change in the period can be considered) or the inner product of the channel state information vectors H1 and H2 is more than or equal to 0.97 (the current channel state information of the terminal is similar to the channel state information obtained based on the CSI-RS1 before), the terminal uses the first shared resource to send the data, if the distance between the geographical position Y of the terminal and the geographical position X is more than 0.3 m and less than or equal to 1 m (the distance of the terminal moving in the period is considered, it can be considered that channel state information may change in this period of time, so that the terminal needs to retransmit a sounding reference signal to enable the base station to obtain a spatial fingerprint corresponding to the terminal) or an inner product of channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9 (which indicates that the current channel state information of the terminal and the channel state information obtained based on CSI-RS1 before have changed a little), the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, transmits the second sounding reference signal sequence on the second sounding reference signal resource, and transmits data using a second shared resource; if the distance between the geographic position Y of the terminal and the geographic position X is greater than 1 meter (which indicates that the terminal has moved a relatively large distance in this period of time, the channel state information changes relatively quickly, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), or the inner product of the channel state information vectors H1 and H2 is less than 0.9 (which indicates that the current channel state information of the terminal has changed greatly from the channel state information obtained previously based on CSI-RS1, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), the terminal selects a spreading sequence from a spreading sequence set to spread the data, and then transmits the data by using a third shared resource.

And if the terminal does not receive successful receiving information fed back by the base station after the terminal uses the first shared resource to send data, the terminal determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, and the terminal sends the second sounding reference signal sequence on the second sounding reference signal resource and uses the second shared resource to send data. And if the terminal does not receive the successful receiving information fed back by the base station after the terminal uses the second shared resource to send the data, the terminal selects a spreading sequence from the spreading sequence set to spread the data, and then uses a third shared resource to send the data. The advantage of this is that the terminal sends data using the more robust shared resource, and multi-level transmission of data is achieved.

If the terminal does not receive the successful receiving information fed back by the base station after using the third shared resource to send data, which indicates that there may be a plurality of terminals sending data on the shared resource and the interference between the terminals is very large, the terminal sends the resource information according to the over-collision indication information and sends the over-collision indication information to the base station, and the base station is expected to transmit data by the terminal through other means, so as to improve the spectrum efficiency of the system.

After receiving the over-collision indication information, the base station sends beam configuration information and (2 × M) beams corresponding to the beam configuration information, where the beam configuration information includes feedback resources required by the terminal to send feedback information to the base station after sensing a specific beam, and thus the base station determines, through the beam feedback information of the terminal, which direction the terminal is located in, and further activates the relay node in the direction range.

After receiving the beam configuration information, the terminal that has sent the over-collision indication information attempts to receive the beam, and if the sensing is successful (that is, the intensity information of the beam received by the terminal is greater than a reference threshold), the terminal sends feedback information to the base station through the feedback resource, where the feedback information at least includes the beam identification number information sensed by the terminal and the received energy information of the beam corresponding to the beam identification number.

The base station determines a beam perceived by a terminal according to the feedback information, the base station sends an activation signaling to a relay node located in a perceived beam coverage area in the perceived beam direction or guides a movable relay node to move to the perceived beam direction, the relay node sends a confirmation message to the base station after receiving the activation message, the base station sends fourth configuration information to the terminal which has sent the over-collision indication message, and the fourth configuration information comprises system information of the relay node.

And the terminal receiving the fourth configuration information accesses the relay node, communicates with the relay node in a non-competitive mode, and retransmits the data which is not successfully transmitted before.

Example 2:

The terminal receives the second configuration information, when the terminal has data to send, the terminal determines the geographical position Y of the terminal, the terminal receives the downlink channel state information reference signal CSI-RS2 according to the configuration information of the downlink channel state information reference signal CSI-RS2 to determine a channel state information vector H2, if the distance between the geographical position Y of the terminal and the geographical position X is less than or equal to 0.3 m (the distance of the terminal moving in the period is very short, and the channel state information does not change in the period can be considered) or the inner product of the channel state information vectors H1 and H2 is more than or equal to 0.97 (the current channel state information of the terminal is similar to the channel state information obtained based on the CSI-RS1 before), the terminal uses the first shared resource to send the data, if the distance between the geographical position Y of the terminal and the geographical position X is more than 0.3 m and less than or equal to 1 m (the distance of the terminal moving in the period is considered, it can be considered that channel state information may change in this period of time, so that the terminal needs to retransmit a sounding reference signal to enable the base station to obtain a spatial fingerprint corresponding to the terminal) or an inner product of channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9 (which indicates that the current channel state information of the terminal and the channel state information obtained based on CSI-RS1 before have changed a little), the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, transmits the second sounding reference signal sequence on the second sounding reference signal resource, and transmits data using a second shared resource; if the distance between the geographic position Y of the terminal and the geographic position X is greater than 1 meter (which indicates that the terminal has moved a relatively large distance in this period of time, the channel state information changes relatively quickly, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), or the inner product of the channel state information vectors H1 and H2 is less than 0.9 (which indicates that the current channel state information of the terminal has changed greatly from the channel state information obtained previously based on CSI-RS1, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), the terminal selects a spreading sequence from a spreading sequence set to spread the data, and then transmits the data by using a third shared resource. Preferably, H1 and H2 are both M × 1-dimensional vectors, and the narrowband internet of things terminal for the reason of this assumption generally has only one receiving antenna due to the implementation cost.

Example 3:

The base station sends second configuration information to the terminal, wherein the second configuration information at least comprises configuration information of a downlink channel state information reference signal CSI-RS2, first shared resource information, second sounding reference signal resource set information and second sounding reference signal sequence set information corresponding to the second shared resource, third shared resource information, spread spectrum sequence set information when the third shared resource is used for sending data, and over-strong indication information is used for sending the resource information. It should be noted that the purpose of configuring the second shared resource and the third shared resource is to allow the terminal to perform data retransmission through the second shared resource and/or the third shared resource if the base station cannot successfully receive uplink data sent by each terminal due to relatively large interference between data sent by multiple terminals on the first shared resource, and the probability of data collision on the second shared resource and the third shared resource is reduced. Preferably, the first sounding reference signal resource set is smaller than the second sounding reference signal resource set, the first sounding reference signal sequence set is smaller than the second sounding reference signal sequence set, and the first shared resource and the second shared resource are equal in size, so that the problem that when a plurality of terminals use the shared resource to generate data simultaneously, the spatial fingerprints of the plurality of terminals are similar due to strong channel correlation, and the base station cannot successfully receive the data is solved.

Example 4:

The base station sends second configuration information to the terminal, wherein the second configuration information at least comprises configuration information of a downlink channel state information reference signal CSI-RS2, first shared resource information, second sounding reference signal resource set information and second sounding reference signal sequence set information corresponding to the second shared resource, third shared resource information, spread spectrum sequence set information when the third shared resource is used for sending data, and over-strong indication information is used for sending the resource information. It should be noted that the purpose of configuring the second shared resource and the third shared resource is to allow the terminal to perform data retransmission through the second shared resource and/or the third shared resource if the base station cannot successfully receive uplink data sent by each terminal due to relatively large interference between data sent by multiple terminals on the first shared resource, and the probability of data collision on the second shared resource and the third shared resource is reduced. Preferably, the length N of the spreading sequence in the spreading sequence set is greater than or equal to 2 × M, which is because if the base station cannot successfully receive uplink data simultaneously transmitted by multiple terminals on the first shared resource or the second shared resource through the M × 1-dimensional spatial fingerprint, it indicates that the channel correlation between the terminals is very strong, and a longer spreading sequence is needed to solve the problem of interference between users.

Example 5:

The base station sends second configuration information to the terminal, wherein the second configuration information at least comprises configuration information of a downlink channel state information reference signal CSI-RS2, first shared resource information, second sounding reference signal resource set information and second sounding reference signal sequence set information corresponding to the second shared resource, third shared resource information, spread spectrum sequence set information when the third shared resource is used for sending data, and over-strong indication information is used for sending the resource information. It should be noted that the purpose of configuring the second shared resource and the third shared resource is to allow the terminal to perform data retransmission through the second shared resource and/or the third shared resource if the base station cannot successfully receive uplink data sent by each terminal due to relatively large interference between data sent by multiple terminals on the first shared resource, and the probability of data collision on the second shared resource and the third shared resource is reduced. Preferably, the size of the third shared resource is N times that of the first shared resource, which is because the terminal needs to transmit data on the third shared resource by means of data spreading, so that more shared resources are needed.

Example 6:

The terminal receives the second configuration information, when the terminal has data to send, the terminal determines the geographical position Y of the terminal, the terminal receives the downlink channel state information reference signal CSI-RS2 according to the configuration information of the downlink channel state information reference signal CSI-RS2 to determine a channel state information vector H2, if the distance between the geographical position Y of the terminal and the geographical position X is less than or equal to 0.3 m (the distance of the terminal moving in the period is very short, and the channel state information does not change in the period can be considered) or the inner product of the channel state information vectors H1 and H2 is more than or equal to 0.97 (the current channel state information of the terminal is similar to the channel state information obtained based on the CSI-RS1 before), the terminal uses the first shared resource to send the data, if the distance between the geographical position Y of the terminal and the geographical position X is more than 0.3 m and less than or equal to 1 m (the distance of the terminal moving in the period is considered, it can be considered that channel state information may change in this period of time, so that the terminal needs to retransmit a sounding reference signal to enable the base station to obtain a spatial fingerprint corresponding to the terminal) or an inner product of channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9 (which indicates that the current channel state information of the terminal and the channel state information obtained based on CSI-RS1 before have changed a little), the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, transmits the second sounding reference signal sequence on the second sounding reference signal resource, and transmits data using a second shared resource; if the distance between the geographic position Y of the terminal and the geographic position X is greater than 1 meter (which indicates that the terminal has moved a relatively large distance in this period of time, the channel state information changes relatively quickly, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), or the inner product of the channel state information vectors H1 and H2 is less than 0.9 (which indicates that the current channel state information of the terminal has changed greatly from the channel state information obtained previously based on CSI-RS1, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), the terminal selects a spreading sequence from a spreading sequence set to spread the data, and then transmits the data by using a third shared resource. Preferably, the data carries identification information of the terminal, and the reason for this is that the base station does not know which terminal is sending information on the shared resource, so it needs to carry a specific terminal identification in the data.

Example 7:

The terminal receives the second configuration information, when the terminal has data to send, the terminal determines the geographical position Y of the terminal, the terminal receives the downlink channel state information reference signal CSI-RS2 according to the configuration information of the downlink channel state information reference signal CSI-RS2 to determine a channel state information vector H2, if the distance between the geographical position Y of the terminal and the geographical position X is less than or equal to 0.3 m (the distance of the terminal moving in the period is very short, and the channel state information does not change in the period can be considered) or the inner product of the channel state information vectors H1 and H2 is more than or equal to 0.97 (the current channel state information of the terminal is similar to the channel state information obtained based on the CSI-RS1 before), the terminal uses the first shared resource to send the data, if the distance between the geographical position Y of the terminal and the geographical position X is more than 0.3 m and less than or equal to 1 m (the distance of the terminal moving in the period is considered, it can be considered that channel state information may change in this period of time, so that the terminal needs to retransmit a sounding reference signal to enable the base station to obtain a spatial fingerprint corresponding to the terminal) or an inner product of channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9 (which indicates that the current channel state information of the terminal and the channel state information obtained based on CSI-RS1 before have changed a little), the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, transmits the second sounding reference signal sequence on the second sounding reference signal resource, and transmits data using a second shared resource; if the distance between the geographic position Y of the terminal and the geographic position X is greater than 1 meter (which indicates that the terminal has moved a relatively large distance in this period of time, the channel state information changes relatively quickly, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), or the inner product of the channel state information vectors H1 and H2 is less than 0.9 (which indicates that the current channel state information of the terminal has changed greatly from the channel state information obtained previously based on CSI-RS1, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), the terminal selects a spreading sequence from a spreading sequence set to spread the data, and then transmits the data by using a third shared resource. Preferably, if the terminal transmits data using the first shared resource, the base station receives the data based on the first spatial fingerprint; if the terminal uses the second shared resource to transmit data, the base station receives data based on the second spatial fingerprint, and the second spatial fingerprint is obtained based on the second sounding reference signal sequence received by the base station, which is because when the number of antennas is large, the channel information on the multiple antennas is generally orthogonal, so that the data transmitted to the base station by different terminals on the shared resource can be decoded by the orthogonal channel information (spatial fingerprint), thereby reducing the usage amount of resources and improving the spectrum efficiency of the system.

Example 8:

The terminal receives the second configuration information, when the terminal has data to send, the terminal determines the geographical position Y of the terminal, the terminal receives the downlink channel state information reference signal CSI-RS2 according to the configuration information of the downlink channel state information reference signal CSI-RS2 to determine a channel state information vector H2, if the distance between the geographical position Y of the terminal and the geographical position X is less than or equal to 0.3 m (the distance of the terminal moving in the period is very short, and the channel state information does not change in the period can be considered) or the inner product of the channel state information vectors H1 and H2 is more than or equal to 0.97 (the current channel state information of the terminal is similar to the channel state information obtained based on the CSI-RS1 before), the terminal uses the first shared resource to send the data, if the distance between the geographical position Y of the terminal and the geographical position X is more than 0.3 m and less than or equal to 1 m (the distance of the terminal moving in the period is considered, it can be considered that channel state information may change in this period of time, so that the terminal needs to retransmit a sounding reference signal to enable the base station to obtain a spatial fingerprint corresponding to the terminal) or an inner product of channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9 (which indicates that the current channel state information of the terminal and the channel state information obtained based on CSI-RS1 before have changed a little), the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, transmits the second sounding reference signal sequence on the second sounding reference signal resource, and transmits data using a second shared resource; if the distance between the geographic position Y of the terminal and the geographic position X is greater than 1 meter (which indicates that the terminal has moved a relatively large distance in this period of time, the channel state information changes relatively quickly, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), or the inner product of the channel state information vectors H1 and H2 is less than 0.9 (which indicates that the current channel state information of the terminal has changed greatly from the channel state information obtained previously based on CSI-RS1, and the base station is likely to be unable to receive the data transmitted by the terminal by means of the spatial fingerprint), the terminal selects a spreading sequence from a spreading sequence set to spread the data, and then transmits the data by using a third shared resource. Preferably, the difference between the downlink channel state information reference signal CSI-RS2 and the second shared resource is not more than 2ms before the downlink channel state information reference signal CSI-RS2 is located in the time domain, which has the advantage that the terminal can accurately know whether the channel used for sending data is consistent with the channel obtained based on CSI-RS1 before; the second sounding reference signal resource is located before the second shared resource in the time domain, and the difference is not more than 0.5ms, so that the base station can obtain an accurate second spatial fingerprint, and the base station is helped to improve the probability of successfully receiving data on the second shared resource.

Example 9:

If the terminal does not receive the successful receiving information fed back by the base station after using the third shared resource to send data, which indicates that there may be a plurality of terminals sending data on the shared resource and the interference between the terminals is very large, the terminal sends the resource information according to the over-collision indication information and sends the over-collision indication information to the base station, and the base station is expected to transmit data by the terminal through other means, so as to improve the spectrum efficiency of the system. Preferably, the terminal sends the information indicating too strong collision with full power, wherein the information indicating too strong collision is a sequence shared by multiple terminals, which has the advantage that it is possible to let the base station know that collision occurs on the shared resource by sending the same sequence on the same time-frequency resource by one or more terminals, thereby updating the configuration information.

Example 10:

The terminal receiving the fourth configuration information accesses the relay node, communicates with the relay node in a non-competitive mode, and retransmits data which is not successfully transmitted before, so that the advantage of avoiding the terminal sending data in a sharing mode and ensuring normal communication between the terminal and a network side is achieved.

The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A data transmission method in a narrow-band Internet of things based on beam sensing is characterized by comprising the following steps:

s5: the terminal sends data according to the sequence with the priority as the first shared resource, the second shared resource and the third shared resource until the data is sent successfully, if the terminal does not receive the successful receiving information fed back by the base station after sending the data by using the third shared resource, the terminal sends resource information according to the over-collision indication information and sends the over-collision indication information to the base station;

2. The method for transmitting data in the narrowband internet of things based on beam sensing as claimed in claim 1, wherein: in step S1, if the number M of the receiving antennas is greater than or equal to 128, the first configuration information further includes first sounding reference signal resource set information and first sounding reference signal sequence set information;

3. The method for data transmission in the narrowband internet of things based on beam sensing as claimed in claim 2, wherein: in step S4, if the distance between the geographical position Y of the terminal and the geographical position X is less than or equal to 0.3 m or the inner product of the channel state information vectors H1 and H2 is greater than or equal to 0.97, the terminal transmits the data using a first shared resource, if the distance between the geographical position Y of the terminal and the geographical position X is greater than 0.3 m and less than or equal to 1 m or the inner product of the channel state information vectors H1 and H2 is less than 0.97 and greater than or equal to 0.9, the terminal determines a second sounding reference signal resource according to the second sounding reference signal resource set information, determines a second sounding reference signal sequence according to the second sounding reference signal sequence set information, the terminal transmits the second sounding reference signal sequence on the second sounding reference signal resource, and transmits the data using the second shared resource; if the distance between the geographic position Y and the geographic position X of the terminal is more than 1 meter or the inner product of the channel state information vectors H1 and H2 is less than 0.9, the terminal selects a spreading sequence from the spreading sequence set to spread the data, and then transmits the data by using the third shared resource.

4. The method for data transmission in the narrowband internet of things based on beam sensing as claimed in claim 3, wherein: if the terminal uses the first shared resource to send data, the base station receives the data based on the first spatial fingerprint; and if the terminal uses the second shared resource to send data, the base station receives the data based on a second spatial fingerprint.

5. The method for data transmission in the narrow-band internet of things based on beam sensing according to any one of claims 2-4, wherein: the channel state information vectors H1 and H2 are M × 1-dimensional vectors, and M is the number of antennas.

6. The method for data transmission in the narrowband internet of things based on beam sensing as claimed in claim 5, wherein: the first sounding reference signal resource set is smaller than the second sounding reference signal resource set, the first sounding reference signal sequence set is smaller than the second sounding reference signal sequence set, the first shared resource and the second shared resource are equal in size, and the length N of a spreading sequence in the spreading sequence set is greater than or equal to 2 × M.

7. The method for data transmission in the narrowband internet of things based on beam sensing as claimed in claim 6, wherein: the third shared resource is N times the size of the first shared resource.

8. The method for data transmission in the narrow-band internet of things based on beam sensing according to any one of claims 1-4, wherein: the downlink channel state information reference signal CSI-RS2 is located before the second shared resource in the time domain, and the difference is not more than 2 ms; the second sounding reference signal resource is located before the second shared resource in the time domain, and the difference is not more than 0.5 ms.

9. The method for data transmission in the narrowband internet of things based on beam sensing as claimed in claim 8, wherein: the data carries identification information of the terminal, and in step S5, the terminal sends the over-collision strength indication information using full power, where the over-collision strength indication information is a sequence shared by multiple terminals.