CN111865518A - Downlink transmission method and device for 5G unlicensed spectrum - Google Patents

Abstract

Embodiments of the present invention provide a method and device for downlink transmission of 5G unlicensed spectrum. The method includes: after competing for an unlicensed frequency band resource, determining a short time slot corresponding to the end position of downlink transmission, and determining the number of OFDM symbols used for data transmission in the short time slot corresponding to the end position of downlink transmission; The downlink control information carrying the first indication information is transmitted in the target short time slot, the first target short time slot is a short time slot before the second target short time slot, and the second target short time slot is the downlink control information The short time slot corresponding to the transmission end position, the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot; the transmission in the second target short time slot carries the first indication Downlink control information for information. The embodiments of the present invention can maximize the utilization of the contentioned transmission time, and improve the resource utilization rate.

Description

Downlink transmission method and device for 5G unlicensed spectrum

technical field

The present invention relates to the field of communication technologies, and in particular, to a method and device for downlink transmission of 5G unlicensed spectrum.

Background technique

With the development of the mobile Internet, the existing network capacity has been unable to meet the rapidly increasing demand for data traffic services. LAA (Licensed Assisted Access, Licensed Assisted Access) utilizes carrier aggregation technology to deploy LTE (Long Term Evolution, Long Term Evolution technology) in unlicensed frequency bands, effectively expanding cellular network capacity.

LAA was introduced in 3GPP Release 13 as part of LTE Advanced Pro. It uses carrier aggregation for the downlink, combining unlicensed spectrum (5GHz) LTE and licensed spectrum LTE. When the LAA base station is ready to transmit data on the LAAScell (Secondary cell, secondary cell), it needs to perform the CCA (Clear Channel Assessment, idle channel assessment) operation on the LAA SCell first, monitor the channel to determine whether the channel is idle, if the channel is idle, The transmitter will start transmitting, otherwise it will not transmit. For the LAA system, the number of OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbols used for transmission in the last short time slot depends on where the base station competes for unlicensed frequency band resources, and when the base station is in the The maximum continuous downlink data transmission time available on the unlicensed frequency band resources is competed for, so the number of OFDM symbols used to transmit downlink data in the last short time slot changes dynamically, and the length of the last short time slot needs to be adjusted by signaling. instruct.

The 5G NR frame structure is more flexible and supports a variety of different subcarrier spacings and time slots of different lengths. The existing indication scheme has an indication scheme for 14-symbol subframes, but the indication granularity is rough and cannot indicate the specific end symbol position. In order to meet the needs of future wireless communication development, it is urgent to study a more fine-grained short-slot length indication scheme.

SUMMARY OF THE INVENTION

In view of the existing technical problems, embodiments of the present invention provide a method and device for downlink transmission of 5G unlicensed spectrum.

An embodiment of the present invention provides a method for downlink transmission of 5G unlicensed spectrum, which is applied to a base station, including: monitoring the channel state of unlicensed spectrum, and competing for unlicensed spectrum resources; the unlicensed spectrum resources include multiple short time slots, each The short time slots consist of a fixed number of OFDM symbols; the method further includes:

After competing for the unlicensed frequency band resource, determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission for The number of OFDM symbols for data transmission;

The downlink control information carrying the first indication information is transmitted in the first target short time slot, the first target short time slot is a short time slot before the second target short time slot, and the second target short time slot is the short time slot corresponding to the end position of the downlink transmission, the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot;

The downlink control information carrying the first indication information is transmitted in the second target short time slot.

An embodiment of the present invention provides a 5G unlicensed spectrum downlink transmission device, which is applied to a base station and includes: a competition unit configured to monitor the channel state of the unlicensed spectrum and compete for unlicensed spectrum resources; the unlicensed spectrum resources include multiple Short time slots, each short time slot consists of a fixed number of OFDM symbols; the device includes:

The determining unit is configured to determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained by competition and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission. The number of OFDM symbols used for data transmission in the time slot;

a first transmission unit, configured to transmit downlink control information carrying first indication information in a first target short time slot, where the first target short time slot is a short time slot before the second target short time slot, and the The second target short time slot is the short time slot corresponding to the end position of the downlink transmission, and the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot;

The second transmission unit is configured to transmit the downlink control information carrying the first indication information in the second target short time slot.

An embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the downlink transmission of the 5G unlicensed spectrum when the processor executes the program method.

Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, implements the above-mentioned downlink transmission method for an unlicensed spectrum of 5G.

The method and device for downlink transmission of 5G unlicensed spectrum provided by the embodiments of the present invention indicate the number of OFDM symbols used for data transmission in the last short time slot of the terminal when using unlicensed frequency band resources for downlink data transmission, so that downlink transmission can be performed. At the end of any OFDM symbol, the end position of downlink transmission is more flexible, which can maximize the utilization of the contentioned transmission time and improve the resource utilization rate.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic flowchart of a downlink transmission method for 5G unlicensed spectrum provided by an embodiment of the present invention;

2 is a schematic diagram of an LAA downlink transmission end position provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of ending short time slot indication information provided by an embodiment of the present invention;

4 is a schematic structural diagram of an apparatus for downlink transmission of 5G unlicensed spectrum provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a method for downlink transmission of 5G unlicensed spectrum provided by an embodiment of the present invention.

The method for downlink transmission of 5G unlicensed spectrum provided by the embodiment of the present invention is applied to a base station, including: monitoring the channel state of unlicensed spectrum, and competing for unlicensed spectrum resources; the unlicensed spectrum resources include multiple short time slots, each short time slot. A slot consists of a fixed number of OFDM symbols. As shown in Figure 1, the following steps are also included:

S11. After competing for the unlicensed frequency band resource, determine the short time slot corresponding to the end position of the downlink transmission according to the position of the unlicensed frequency band resource obtained and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission. The number of OFDM symbols used for data transmission;

Specifically, after the base station competes for an unlicensed frequency band resource (unlicensed frequency band resource), the duration of using the resource for data transmission is limited by the maximum channel occupancy time (Maximum Channel Occupancy Time, MCOT). Generally speaking, the value of MCOT is an integer multiple of 1ms; on the other hand, because the time when the base station competes for the unlicensed frequency band resources is random, that is, in order to ensure the data transmission opportunity on the unlicensed frequency band, the base station may be in the subframe. The downlink data starts to be transmitted at any time point (that is, the starting position of the subframe is not fixed), and the downlink data here includes padding and valid data. Taking the above two aspects into consideration, the base station can determine the last downlink short time slot and the number of OFDM symbols for downlink data transmission in the last downlink short time slot after competing for the license-exempt frequency band resources.

FIG. 2 shows a schematic diagram of the end position of the LAA downlink transmission.

As shown in Fig. 2, in the maximum transmission time, the short timeslot n-1, the short timeslot n is the common short timeslot, and the short timeslot n+1 is the last downlink short timeslot. The position of the last OFDM symbol used to transmit downlink data in the short time slot n+1 is the candidate end position.

S12. Transmit downlink control information carrying the first indication information in a first target short time slot, where the first target short time slot is a short time slot before the second target short time slot, and the second target short time slot is a short time slot. The slot is a short time slot corresponding to the end position of the downlink transmission, and the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot;

S13. Transmit downlink control information carrying the first indication information in the second target short time slot.

The embodiment of the present invention indicates the number of OFDM symbols used for data transmission in the last short time slot of the terminal when the license-exempt frequency band resource is used for downlink data transmission.

Specifically, by transmitting the downlink common control information, the base station indicates the number of OFDM symbols used for transmitting downlink data in the last downlink short time slot.

Referring to FIG. 2 , the number of symbols may be 1-7. If the short time slot n+1 (the second target short time slot) is the last short time slot of the downlink burst, it is necessary to transmit the downlink in the short time slot n+1 in the short time slot n (the first target short time slot). The indication information of the number of OFDM symbols for data transmission, and at the same time, in order to ensure the reliability of data transmission, the indication information needs to be transmitted again in the short time slot n+1.

The downlink transmission method of the 5G unlicensed spectrum provided by the embodiment of the present invention indicates the number of OFDM symbols used for data transmission in the last short time slot of the terminal when using the unlicensed frequency band resources for downlink data transmission, and the downlink transmission can be performed at any time. At the end of each OFDM symbol, the end position of downlink transmission is more flexible, which can maximize the utilization of the contentioned transmission time and improve the resource utilization rate.

On the basis of the above embodiment, the method further includes:

When the number of OFDM symbols used for data transmission in the second target short time slot is equal to the total number of OFDM symbols in the second target short time slot, the transmission in the second target short time slot carries the second indication information The downlink control information, the second indication information is used to indicate that the second target short time slot is a downlink burst end short time slot.

Specifically, referring to FIG. 2 , the number of symbols may be 1-7. When the number of OFDM symbols used to transmit downlink data in the last short time slot is 7, the base station also needs to indicate through the common control information that the short time slot is a downlink burst end short time slot.

On the basis of the above embodiment, the method further includes:

The first indication information is carried by setting the value of the Subframe configuration for LAA field in the downlink control information.

Specifically, the common control information for notifying the last short time slot of the downlink burst is transmitted in the Subframe configuration for LAA field in the DCI (Downlink Control Information).

On the basis of the above embodiment, the method further includes:

When the number of OFDM symbols in each short time slot is 7, carrying the first indication information by setting the value of the Subframe configuration for LAA field in the downlink control information includes:

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 1, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0000 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1000;

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 2, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0001 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1001;

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 3, the value of the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0010 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1010;

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 4, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0011 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1011;

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 5, the value of the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0100 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1100;

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 6, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0101 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1101;

When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 7, the value of the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0111 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1111.

Specifically, referring to FIG. 2 , the number of symbols may be 1 to 7, and the short time slot n+1 is the last short time slot of the downlink burst.

FIG. 3 shows a schematic diagram of the indication information for ending the short time slot when the number of symbols in each short time slot is 7.

Referring to Figure 3, the length of the Subframe configuration for LAA field is 4 bits, which is used to indicate the length of the subframe at the end of the downlink burst, and the specific indication information is as follows:

1. The value of the Subframe configuration for LAA field in the PDCCH of the short slot n is '0000', and the value of the Subframe configuration for LAA field in the PDCCH of the short slot n+1 is '1000', then the value of the short slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 1;

2. The value of the Subframe configuration for LAA field in the PDCCH of the short slot n is '0001', and the value of the Subframe configuration for LAA field of the PDCCH of the short slot n+1 is '1001', then the value of the short slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 2;

3. The value of the Subframe configuration for LAA field in the PDCCH of the short time slot n is '0010', and the value of the Subframe configuration for LAA field of the PDCCH of the short time slot n+1 is '1010', then the value of the short time slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 3;

4. The value of the Subframe configuration for LAA field in the PDCCH of the short slot n is '0011', and the value of the Subframe configuration for LAA field of the PDCCH of the short slot n+1 is '1011', then the value of the short slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 4;

5. The value of the Subframe configuration for LAA field in the PDCCH of the short slot n is '0100', and the value of the Subframe configuration for LAA field in the PDCCH of the short slot n+1 is '1100', then the value of the short slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 5;

6. The value of the Subframe configuration for LAA field in the PDCCH of the short slot n is '0101', and the value of the Subframe configuration for LAA field in the PDCCH of the short slot n+1 is '1101', then the value of the short slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 6;

7. The value of the Subframe configuration for LAA field in the PDCCH of the short slot n is '0111', and the value of the Subframe configuration for LAA field in the PDCCH of the short slot n+1 is '1111', then the value of the short slot n+ 1 The number of OFDM symbols used for downlink data (including control channel) transmission is 7;

The embodiment of the present invention flexibly indicates the format of the last short time slot, and the downlink transmission can end in any OFDM symbol, maximizing the utilization of the contentioned transmission time, and improving the resource utilization rate.

FIG. 4 shows a schematic structural diagram of an apparatus for downlink transmission of a 5G unlicensed spectrum provided by an embodiment of the present invention. The device is applied to a base station, and includes: a competition unit for monitoring the channel state of the unlicensed spectrum and competing for the unlicensed spectrum resource; the unlicensed frequency band resource includes a plurality of short time slots, and each short time slot consists of a fixed number of OFDM symbol composition; as shown in FIG. 4 , the apparatus further includes: a determination unit 11, a first transmission unit 12 and a second transmission unit 13, wherein:

The determining unit 11 is configured to determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained by competition and the maximum channel occupancy time, and determine the end position of the downlink transmission The number of OFDM symbols used for data transmission in the corresponding short time slot;

Specifically, after the base station competes for an unlicensed frequency band resource (unlicensed frequency band resource), the duration of using the resource for data transmission is limited by the maximum channel occupancy time (Maximum Channel Occupancy Time, MCOT). Generally speaking, the value of MCOT is an integer multiple of 1ms; on the other hand, because the time when the base station competes for the unlicensed frequency band resources is random, that is, in order to ensure the data transmission opportunity on the unlicensed frequency band, the base station may be in the subframe. The downlink data starts to be transmitted at any time point (that is, the starting position of the subframe is not fixed), and the downlink data here includes padding and valid data. Taking the above two aspects into consideration, the base station can determine the last downlink short time slot and the number of OFDM symbols for downlink data transmission in the last downlink short time slot after competing for the license-exempt frequency band resources.

Refer to FIG. 2 for the end position of the LAA downlink transmission.

The first transmission unit 12 is configured to transmit the downlink control information carrying the first indication information in the first target short time slot, where the first target short time slot is a short time slot before the second target short time slot , the second target short time slot is a short time slot corresponding to the end position of the downlink transmission, and the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot;

The second transmission unit 13 is configured to transmit the downlink control information carrying the first indication information in the second target short time slot.

The embodiment of the present invention indicates the number of OFDM symbols used for data transmission in the last short time slot of the terminal when the license-exempt frequency band resource is used for downlink data transmission.

Specifically, by transmitting the downlink common control information, the base station indicates the number of OFDM symbols used for transmitting downlink data in the last downlink short time slot.

Referring to FIG. 2 , the number of symbols may be 1-7. If the short time slot n+1 (the second target short time slot) is the last short time slot of the downlink burst, it is necessary to transmit the downlink in the short time slot n+1 in the short time slot n (the first target short time slot). The indication information of the number of OFDM symbols for data transmission, and at the same time, in order to ensure the reliability of data transmission, the indication information needs to be transmitted again in the short time slot n+1.

The 5G unlicensed spectrum downlink transmission device provided by the embodiment of the present invention indicates the number of OFDM symbols used for data transmission in the last short time slot of the terminal when using the unlicensed frequency band resources for downlink data transmission, and the downlink transmission can be performed at any time. At the end of each OFDM symbol, the end position of downlink transmission is more flexible, which can maximize the utilization of the contentioned transmission time and improve the resource utilization rate.

On the basis of the above embodiment, the device further includes:

a third transmission unit, configured to, when the number of OFDM symbols used for data transmission in the second target short slot is equal to the total number of OFDM symbols in the second target short slot Downlink control information carrying second indication information is transmitted in the inner part, and the second indication information is used to indicate that the second target short time slot is a downlink burst end short time slot.

Specifically, referring to FIG. 2 , the number of symbols may be 1-7. When the number of OFDM symbols used to transmit downlink data in the last short time slot is 7, the base station also needs to indicate through the common control information that the short time slot is a downlink burst end short time slot.

On the basis of the above embodiment, the device further includes:

A setting unit, configured to set the value of the Subframe configuration for LAA field in the downlink control information to carry the first indication information.

Specifically, the common control information for notifying the last short time slot of the downlink burst is transmitted in the Subframe configuration for LAA field in the DCI (Downlink Control Information).

On the basis of the above embodiment, when the number of OFDM symbols in each short time slot is 7, the setting unit includes:

A first setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 1 The value of the forLAA field is 0000, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1000;

A second setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 2 The value of the forLAA field is 0001, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1001;

A third setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 3 The value of the forLAA field is 0010, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1010;

a fourth setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 4 The value of the forLAA field is 0011, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1011;

A fifth setting module, used for subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 5 The value of the forLAA field is 0100, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1100;

The sixth setting module is used for subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 6 The value of the forLAA field is 0101, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1101;

A seventh setting module, used for subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 7 The value of the forLAA field is 0111, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1111.

Specifically, when the number of symbols in each short time slot is 7, the indication information of the end of the short time slot is shown in FIG. 3 , which will not be repeated here.

An example is as follows:

FIG. 5 illustrates a schematic diagram of the physical structure of a server. As shown in FIG. 5 , the server may include: a processor (processor) 21, a communication interface (Communications Interface) 22, a memory (memory) 23 and a communication bus 24, wherein, The processor 21 , the communication interface 22 , and the memory 23 communicate with each other through the communication bus 24 . The processor 21 may invoke logic instructions in the memory 23 to perform the following methods:

After competing for the unlicensed frequency band resource, determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission for The number of OFDM symbols for data transmission;

The downlink control information carrying the first indication information is transmitted in the first target short time slot, the first target short time slot is a short time slot before the second target short time slot, and the second target short time slot is the short time slot corresponding to the end position of the downlink transmission, the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot;

The downlink control information carrying the first indication information is transmitted in the second target short time slot.

In addition, the above-mentioned logic instructions in the memory 23 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

On the other hand, an embodiment of the present invention further provides a non-transitory computer-readable storage medium on which a computer program is stored, and the computer program is implemented by a processor to execute the transmission method provided by the above embodiments, for example, including :

After competing for the unlicensed frequency band resource, determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission for The number of OFDM symbols for data transmission;

The downlink control information carrying the first indication information is transmitted in the first target short time slot, the first target short time slot is a short time slot before the second target short time slot, and the second target short time slot is the short time slot corresponding to the end position of the downlink transmission, the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot;

The downlink control information carrying the first indication information is transmitted in the second target short time slot.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for downlink transmission of 5G unlicensed spectrum, applied to a base station, comprising: monitoring the channel state of unlicensed spectrum, and competing for unlicensed spectrum resources; The slot consists of a fixed number of OFDM symbols; it is characterized in that the method includes: After competing for the unlicensed frequency band resource, determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission for The number of OFDM symbols for data transmission; The downlink control information carrying the first indication information is transmitted in the first target short time slot, the first target short time slot is a short time slot before the second target short time slot, and the second target short time slot is the short time slot corresponding to the end position of the downlink transmission, the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot; The downlink control information carrying the first indication information is transmitted in the second target short time slot. 2. The method for downlink transmission of 5G unlicensed spectrum according to claim 1, wherein the method further comprises: When the number of OFDM symbols used for data transmission in the second target short time slot is equal to the total number of OFDM symbols in the second target short time slot, the transmission in the second target short time slot carries the second indication information The downlink control information, the second indication information is used to indicate that the second target short time slot is a downlink burst end short time slot. 3. The method for downlink transmission of 5G unlicensed spectrum according to claim 1, wherein the method comprises: The first indication information is carried by setting the value of the Subframe configuration for LAA field in the downlink control information. 4. The method for downlink transmission of 5G unlicensed spectrum according to claim 3, characterized in that, when the number of OFDM symbols in each short time slot is 7, by setting the Subframe configuration in the downlink control information The value of the forLAA field that carries the first indication information includes: When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 1, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0000 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1000; When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 2, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0001 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1001; When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 3, the value of the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0010 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1010; When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 4, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0011 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1011; When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 5, the value of the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0100 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1100; When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 6, the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0101 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short time slot is 1101; When the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 7, the value of the Subframe configuration for LAA field in the PDCCH of the first target short slot is 0111 , the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1111. 5. A 5G unlicensed spectrum downlink transmission device, applied to a base station, comprising: a competition unit for monitoring the channel state of the unlicensed spectrum and competing for unlicensed spectrum resources; the unlicensed frequency band resources include a plurality of short time slots , each short time slot consists of a fixed number of OFDM symbols; it is characterized in that, the device includes: The determining unit is configured to determine the short time slot corresponding to the end position of downlink transmission according to the position of the unlicensed frequency band resource obtained by competition and the maximum channel occupancy time, and determine the short time slot corresponding to the end position of the downlink transmission. The number of OFDM symbols used for data transmission in the time slot; a first transmission unit, configured to transmit downlink control information carrying first indication information in a first target short time slot, where the first target short time slot is a short time slot before the second target short time slot, and the The second target short time slot is the short time slot corresponding to the end position of the downlink transmission, and the first indication information is used to indicate the number of OFDM symbols used for data transmission in the second target short time slot; The second transmission unit is configured to transmit the downlink control information carrying the first indication information in the second target short time slot. 6. The device for downlink transmission of 5G unlicensed spectrum according to claim 5, wherein the device further comprises: a third transmission unit, configured to, when the number of OFDM symbols used for data transmission in the second target short slot is equal to the total number of OFDM symbols in the second target short slot Downlink control information carrying second indication information is transmitted in the inner part, and the second indication information is used to indicate that the second target short time slot is a downlink burst end short time slot. 7. The device for downlink transmission of 5G unlicensed spectrum according to claim 5, wherein the device comprises: A setting unit, configured to set the value of the Subframe configuration for LAA field in the downlink control information to carry the first indication information. 8. The device for downlink transmission of 5G unlicensed spectrum according to claim 7, wherein when the number of OFDM symbols in each short time slot is 7, the setting unit comprises: A first setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 1 The value of the for LAA field is 0000, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1000; A second setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 2 The value of the for LAA field is 0001, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1001; A third setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 3 The value of the for LAA field is 0010, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1010; a fourth setting module, configured to perform Subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 4 The value of the for LAA field is 0011, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1011; A fifth setting module, used for subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 5 The value of the for LAA field is 0100, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1100; The sixth setting module is used for subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 6 The value of the for LAA field is 0101, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1101; A seventh setting module, used for subframe configuration in the PDCCH of the first target short slot when the first indication information indicates that the number of OFDM symbols used for data transmission in the second target short slot is 7 The value of the for LAA field is 0111, and the value of the Subframe configuration for LAA field in the PDCCH of the second target short slot is 1111. 9. An electronic device, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements any one of claims 1 to 4 when the processor executes the program The steps of the downlink transmission method of the 5G unlicensed spectrum described in item. 10. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the downlink of the 5G unlicensed spectrum according to any one of claims 1 to 4 is realized The steps of the transfer method.

Images