CN111669236A

CN111669236A - Listen-before-send transmission method, device and system

Info

Publication number: CN111669236A
Application number: CN202010414017.7A
Authority: CN
Inventors: 刘晓峰; 魏贵明; 杜滢; 闫志宇; 焦慧颖; 沈霞; 徐菲
Original assignee: China Academy of Information and Communications Technology CAICT
Current assignee: China Academy of Information and Communications Technology CAICT
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-09-15
Anticipated expiration: 2040-05-15
Also published as: CN111669236B

Abstract

The application discloses listen before send transmission method for 5G system, including: the LBT bandwidth is determined according to the signal carrier frequency and the subcarrier spacing: when the first frequency of the signal carrier is greater than the second frequency, the LBT first bandwidth is not less than the second bandwidth correspondingly; when the first subcarrier spacing is greater than the second subcarrier spacing, the LBT first bandwidth is not less than the second bandwidth accordingly; the LBT bandwidth, comprising at least 2 alternative values. The application also comprises the terminal equipment, the network equipment and the mobile communication system which use the method. The method, the equipment and the system provided by the invention realize the high-frequency LBT process, and particularly can efficiently carry out system access in a high-frequency unlicensed frequency band.

Description

Listen-before-send transmission method, device and system

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a listen before send transmission method, device, and system.

Background

The 5G new air interface (NR) has completed both versions R15 and R16, supporting up to 52.6GHz according to the current version. According to the initial vision of 5G, the design of 5 GNRs needs to support frequency usage of 100 GHz. In higher frequency bands, it is desirable to consider supporting larger bandwidths while overcoming the adverse effects of large path loss, and therefore to enhance existing NR designs.

The bands above 52.6GHz are wider than the lower bands and there are a large number of unlicensed bands. Aiming at the characteristics, the design of adopting larger subcarrier spacing and considering unauthorized access needs to be considered. The access in the unlicensed frequency band needs Listen Before Talk (LBT), and data transmission can be performed only when the channel is sensed to be idle. LBT needs to be based on a certain bandwidth, and if the LBT bandwidth is still based on 20MHz at 1GHz and above, if 1GHz bandwidth is adopted for transmission, LBT needs to be performed more than 50 times, and the system overhead is too large. In addition, the frequency resources available in the 20MHz bandwidth are limited, and when the subcarrier spacing increases, the number of frequency domain resource blocks included in the 20MHz is reduced by multiple times, and the system efficiency is significantly reduced.

Disclosure of Invention

The application provides a method, equipment and a system for transmitting after listening, which solve the problem of low efficiency of a high-frequency band system. The method, the equipment and the system provided by the invention realize the high-frequency LBT process, and particularly can efficiently carry out system access in a high-frequency unlicensed frequency band.

In a first aspect, an embodiment of the present application provides a listen before send transmission method for a 5G system, including the following steps:

determining the LBT bandwidth according to the signal carrier frequency and the subcarrier spacing:

when the first frequency of the signal carrier is greater than the second frequency, the LBT first bandwidth is not less than the second bandwidth correspondingly;

when the first subcarrier spacing is greater than the second subcarrier spacing, the LBT first bandwidth is not less than the second bandwidth accordingly;

the LBT bandwidth, comprising at least 2 alternative values.

Preferably, within a set frequency band range, the subcarrier intervals of the signals are different, and the LBT bandwidths are the same; the set frequency range is at least one of the following ranges: not more than 6G, >6G, 6-52.6G, not less than 52.6G;

and/or, in a set frequency range, the LBT bandwidths are different, and the subcarrier intervals of the signals are the same; the set frequency range is at least one of the following ranges: not more than 6GHz, >6GHz, 6-52.6 GHz, not less than 52.6 GHz.

Further, the first information is included in a system message and/or a higher layer signaling, and the first information is used for indicating the LBT bandwidth value.

Further, the combination of the LBT bandwidth and the subcarrier spacing allows the number of available RBs to be within a preset range.

Preferably, the alternative values comprise at least 2 of: 20MHz, 80MHz, 160MHz, 250MHz, 320MHz and 640 MHz.

Preferably, the determining the LBT bandwidth according to the signal carrier frequency and the subcarrier spacing includes at least 1 of the following correspondence relations:

the frequency is less than or equal to 6GHz, the subcarrier spacing is 15kHz or 30kHz, and the LBT bandwidth is 20 MHz;

the frequency is more than 6GHz, the subcarrier interval is 60kHz or 120kHz, and the LBT bandwidth is 80 MHz;

the frequency is 6-52.6 GHz, the subcarrier interval is 60kHz or 120kHz, and the LBT bandwidth is 80 MHz;

the frequency is more than or equal to 52.6GHz, the subcarrier spacing is 120kHz or 240kHz, and the LBT bandwidth is 160 MHz;

the frequency is more than or equal to 52.6GHz, the subcarrier spacing is 120kHz or 240kHz, and the LBT bandwidth is 250 MHz;

the frequency is more than or equal to 52.6GHz, the subcarrier spacing is 120kHz or 240kHz, and the LBT bandwidth is 320 MHz;

the frequency is more than or equal to 52.6GHz, the subcarrier spacing is 240kHz or 480kHz, and the LBT bandwidth is 640 MHz.

In a second aspect, the present application further provides a network device, configured to implement the method in any one of the embodiments of the first aspect of the present application. The network equipment determines the LBT bandwidth and initiates an LBT process according to the signal carrier frequency and the subcarrier interval; and the network equipment also occupies the LBT bandwidth to send a downlink signal.

Preferably, the present application further proposes a network device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of the embodiments of the first aspect of the application.

In a third aspect, the present application further provides a terminal device, which is used in the method described in any one of the embodiments of the first aspect of the present application. The terminal equipment determines the LBT bandwidth according to the signal carrier frequency and the subcarrier interval; and the terminal equipment also occupies the LBT bandwidth to receive the downlink signal.

Preferably, the present application proposes a terminal device, including: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any of the embodiments of the first aspect of the application.

In a fourth aspect, the present application also proposes a computer-readable medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to any one of the embodiments of the present application.

In a fifth aspect, the present application further provides a mobile communication system, which includes at least 1 embodiment of any terminal device in the present application and/or at least 1 embodiment of any network device in the present application.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

the signal transmission method, the signal transmission equipment and the signal transmission system can use various LBT bandwidths in an unlicensed frequency spectrum, so that different actual services can be matched with various available bandwidths. Especially in the case of the frequency band above 52.6GHz where multiple subcarrier spacings need to be used to match different services and different bandwidth usage. When LBT technology is used for high-bandwidth access, the invention can effectively use high-frequency large-bandwidth resources on the basis of ensuring fair coexistence with other systems.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic diagram of a communication system configuration and signaling configuration;

FIG. 2 is a flow chart of an embodiment of a method of the present application;

FIG. 3 is a flow chart of an embodiment of a method of the present application for a network device;

FIG. 4 is a flowchart of an embodiment of a method of the present application for a terminal device;

FIG. 5 is a schematic diagram of an embodiment of a network device;

FIG. 6 is a schematic diagram of an embodiment of a terminal device;

fig. 7 is a schematic structural diagram of a network device according to another embodiment of the present invention;

fig. 8 is a block diagram of a terminal device of another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a communication system configuration and a signaling configuration.

Consider a communication system consisting of network devices and terminal devices, as in fig. 1. Network deviceThe data can be sent and received to a plurality of terminal devices at the same time. The network device includes a network data unit and a network control unit. The terminal device includes a terminal data unit and a terminal control unit. The network data unit and the terminal data unit transmit data through a downlink data shared channel (PDSCH) and an uplink data shared channel (PUSCH). The network control unit and the terminal control unit exchange control information through a synchronization and broadcast channel (SS/PHCH block, SSB), a downlink control channel (PDCCH), an uplink access channel (PRACH), and an uplink control channel (PUCCH). The SSB sends the synchronizing signal and the broadcast information, and the terminal control unit receives the SSB to synchronize and acquire the basic system information. The PDCCH transmits Downlink Control Information (DCI) and performs specific transmission format-related contents of the PDSCH, PUSCH, and PUCCH. And after the data of the terminal data unit is received, the terminal control unit initiates access based on the PRACH to the network equipment according to the control information sent by the network control unit and the data receiving condition of the terminal data unit, or feeds back whether the data correctly receives the ACK/NACK information, or sends the data of the terminal to the network. The basic time transmission unit in the system is a symbol, and 14 symbols form a time slot. A time slot of length 1/2^kAnd ms, where k is a positive integer and corresponds to different subcarrier intervals, respectively, and for example, when k is 0,1,2,3, and 4, the subcarrier intervals correspond to 15kHz, 30kHz, 60kHz, 120kHz, and 240 kHz.

In the current standard, LBT is required for access to an unlicensed frequency band. LBT also has multiple classes depending on the content of the transmission. Three LBT procedures are typical for the comparison, called Cat1 LBT (LBT grade 1), Cat2 LBT (LBT grade 2) and Cat4 LBT (LBT grade 4), respectively. Different LBT classes correspond to LBT regulatory rules in different countries and regions. In actual data transmission, different data types and physical channels are different, and different LBT levels can be adopted according to the supervision rules. There are common parameters for different LBT classes, and there are also parameters specific to different LBT classes. One common parameter of interest is LBT bandwidth. According to existing designs, unlicensed band access is based on LBT at 20 MHz.

In order to support transmission of different frequencies, the 5G NR design supports various subcarrier intervals, for example, the SS/PBCH can support subcarrier intervals of 15kHz, 30kHz, 60kHz, 120kHz, 240kHz and the like, and the PDSCH \ PDCCH \ PUSCH \ PUCCH \ PRACH and other channels can support subcarrier intervals of 15kHz, 30kHz, 60kHz, 120kHz and the like. Larger subcarrier spacing is required at high frequencies to use larger bandwidths, and subcarrier spacing above 60kHz is currently available at 6GHz-52.6 GHz.

In the 52.6GHz-71GHz band, there are a large number of unlicensed bands, and the available bandwidths are all at several GHz. If the LBT bandwidth of 20MHz is used, some problems are faced:

(1) at 20MHz bandwidth, the available frequency domain resources are limited. As described above, NR supports a plurality of subcarrier spacings, and different subcarrier spacings support different numbers of Resource Blocks (RBs) in the frequency domain at 20 MHz. According to the present exemplary configuration, the number of RBs supported for different bandwidths at 15, 30, and 60kHz subcarrier spacing is shown in Table 1. It can be seen that the number of RBs included in 20MHz is reduced by a factor as the subcarrier spacing is increased. As the subcarrier spacing increases, the number of RBs available in a 20MHz bandwidth is less than 25. Too few RBs within a single LBT bandwidth will significantly reduce the efficiency of the system. Under the current NR mechanism, the SS/PBCH transmission also needs more than 20 RBs, the SS/PBCH subcarrier intervals adopted at high frequency are all 120kHz and more, and the SS/PBCH transmission cannot be completed by the bandwidth of 20 MHz.

TABLE 1 typical RB counts at different bandwidths at 15kHz, 30kHz and 60kHz subcarrier spacing

In the above table, N_RBIndicating the number of RBs. The first row in the table is the bandwidth and the first column is the subcarrier spacing (SCS).

(2) For large bandwidths, the LBT overhead of 20MHz is too large. For high frequency bands, especially those above 52.5GHz, the effective spectral width is several G. For 1G bandwidth, using LBT bandwidth of 20MHz, and in order to guarantee the use of 1GHz frequency spectrum, carrying out LBT for 50 times; supporting bandwidths up to 5GHz or more, the number of LBTs will increase to several hundred times based on 20MHz LBT. This overhead is too large even if the system efficiency is reduced without taking into account the coordination of the different LBT procedures.

To solve the above problem, a larger LBT bandwidth needs to be adopted in the high frequency band. The scheme of the invention can well use large bandwidth resources in high-frequency and unauthorized frequency bands.

Fig. 2 is a flow chart of an embodiment of the method of the present application.

Before sending a signal, a network device performs an LBT procedure, and the LBT referred to in this application includes different LBT modes. Specifically, Cat2 LBT (LBT grade 2) and Cat4 LBT (LBT grade 4) are most commonly used. Cat2 LBT listens to the current channel once 16/25us before sending data. The Cat4 LBT performs two-part interception before sending data, the first part is a single interception and the second part is a circulating multiple interception, and the specific process can refer to the current standard, such as 3GPP TR 37.213.

If not specifically stated, the LBT bandwidth in the present application refers to a bandwidth of a downlink LBT procedure, that is, a downlink LBT bandwidth.

The network device needs to base a certain bandwidth when performing different grades of LBT. Different LBT bandwidths need to be determined in the face of different application scenarios. When determining the LBT bandwidth, it is necessary to consider various factors such as the transmission bandwidth, the adopted subcarrier spacing, the number of transmission carriers, the interference condition, etc.

The embodiment provides a listen before send transmission method for a 5G system, which comprises the following steps 101-104:

step 101, presetting a group of corresponding relations of LBT bandwidth, signal carrier frequency and subcarrier interval to ensure that

Each carrier frequency, corresponding to LBT bandwidth, comprises 1 or more bandwidth values;

each subcarrier interval, corresponding LBT bandwidth, contains 1 or more bandwidth values;

each combination of carrier frequency and subcarrier frequency, corresponding to an LBT bandwidth, contains 1 or more bandwidth values.

Further, the combination of the LBT bandwidth and the subcarrier spacing allows the number of available RBs to be within a preset range. Table 2 lists the number of RBs that can be supported in different LBT bandwidths, for example, when the number of RBs available is preset to be in the range of 50 to 100, the combination of the LBT bandwidth and the subcarrier spacing includes: {80MHz, 60kHz }, {80MHz, 120kHz }, {160MHz, 240kHz }, {250MHz, 240kHz }, {320MHz, 480kHz }, {640MHz, 480kHz }.

TABLE 2 typical RB number under different LBT Bandwidth

	80MHz	160MHz	250MHz	320MHz	640MHz
						60kHz	100	200	N/A	N/A	N/A
120kHz	50	100	156	200	N/A
						240kHz	25	50	78	100	200
480kHz	12	25	39	50	100

In the above table, the first row is the bandwidth and the first column is the subcarrier spacing.

Preferably, the determining the bandwidth according to the signal carrier frequency and the subcarrier spacing includes at least 1 of the following correspondence relations:

Step 102, determining an LBT bandwidth according to a signal carrier frequency and a subcarrier interval;

the bandwidth for performing the LBT process is determined according to the signal carrier frequency and the subcarrier spacing:

when the first frequency of the signal carrier is greater than the second frequency, accordingly, the LBT first bandwidth is not less than the second bandwidth. At this time, when the frequency of the signal carrier is the first frequency, the LBT bandwidth is the first bandwidth; the LBT bandwidth is a second bandwidth when the frequency of the signal carrier is a second frequency.

When the first subcarrier spacing is greater than the second subcarrier spacing, accordingly, the LBT first bandwidth is not less than the second bandwidth. At this time, when the signal is transmitted under the condition of the first subcarrier interval, the LBT bandwidth is the first bandwidth; and when the signal is transmitted under the condition of the second subcarrier spacing, the LBT bandwidth is a second bandwidth.

Accordingly, when the LBT first bandwidth value is greater than the second bandwidth value, the first frequency of the signal carrier is not less than the second frequency, and or the first subcarrier spacing is not less than the second subcarrier spacing.

The term "not less than" in this step means that the number of the schemes is not less than two.

The LBT bandwidth, comprising at least 2 alternative values.

Preferably, within a set frequency band range, the subcarrier intervals of the signals are different, and the LBT bandwidths are the same; the set frequency range is at least one of the following ranges: not more than 6G, >6G, 6-52.6G, not less than 52.6G. The examples 1-2, tables 3-5; example 3, Table 6 Nos. 1 to 2.

And/or, in a set frequency range, the LBT bandwidths are different, and the subcarrier intervals of the signals are the same; the set frequency range is at least one of the following ranges: not more than 6GHz, >6GHz, 6-52.6 GHz, not less than 52.6 GHz. The method is as in example 3, Table 6 Nos. 3 to 5.

Step 103, generating or identifying first information in a system message or a high-level signaling;

first information is included in system messages (MIBs and or SIBs) and or higher layer signaling (e.g., RRC messages), the first information indicating the LBT bandwidth value.

Step 104, sending or receiving a downlink signal according to the LBT bandwidth;

the downlink signal comprises at least one of the following: SS/PBCH block, PDCCH, PDSCH.

The scheme provided by the invention is explained in detail by a plurality of examples.

Example 1

In this embodiment, the LBT bandwidth has 2 values, and corresponds to the low frequency band unlicensed spectrum and the high frequency band unlicensed spectrum, respectively. The bandwidth value corresponding to the low-frequency band unlicensed spectrum is A; the bandwidth value corresponding to the high-frequency band unlicensed spectrum is B. A typical value for a is 20 MHz; typical values for B are e.g. 160MHz, 200MHz, 320MHz, 400MHz, etc. There is also a limit to the subcarrier spacing with a, as a is only applicable for 15kHz and 30 kHz. Similarly, B also has suitable subcarrier spacings, such as 60kHz, 120kHz, 240 kHz.

Table 3 example with 2 LBT bandwidths

LBT bandwidth	Applicable frequency band	Adapted to subcarrier spacing
			20MHz	6GHz and below	15kHz、30kHz
160MHz	Over 6GHz	60kHz、120kHz、240kHz

Table 3 gives an example of LBT at 6GHz and below using 20MHz, and LBT bandwidth above 6GHz using 160 MHz. Wherein the LBT bandwidth of 20MHz is only suitable for the subcarrier spacing of 15kHz, 30kHz, and 160MHz is suitable for the subcarrier spacing of 60kHz, 120kHz, 240 kHz. When only one kind of LBT bandwidth of a high frequency band is supported, the number of supported Resource Blocks (RBs) is different for different subcarrier spacing numbers. In a 160MHz bandwidth, the number of available RBs for 240kHz subcarrier spacing is around 50, the number of available RBs for 120kHz subcarrier spacing is around 100, and the number of RBs for 60kHz subcarrier spacing is around 200. If the LBT bandwidth is increased above 200MHz, the subcarrier spacing of 60kHz would not be suitable for use, limited by the maximum number of RBs per carrier. And under the bandwidth of 160MHz, the subcarrier interval of 480kHz contains about 25 RBs. A larger LBT bandwidth needs to be considered if a sub-carrier spacing of 480kHz is used. In the example of table 3, the bandwidth of 160MHz as the LBT bandwidth is also unreasonable for the subcarrier spacing of 60kHz, since each transmission is based on 200 RBs, which consumes much energy.

In general, for one LBT bandwidth, corresponding to 2 subcarrier spacings is a reasonable design. More than 2 subcarrier spacings need to be supported at high frequencies to match different application scenarios and use cases, and considering more available LBT bandwidth is a more optimal design. Table 4 gives another example of 2 LBT bandwidths. In contrast to the example of table 1, the example of table 2 supports only two subcarrier spacings of 60kHz and 120kHz for the 6GHz band. For the LBT bandwidth of 80MHz, if the large bandwidth of 6GHz is supported, the number of LBTs performed at one time is more than 70 times, and the overhead is also large.

Table 4 example two using 2 LBT bandwidths

LBT bandwidth	Applicable frequency band	Adapted to subcarrier spacing
			20MHz	6GHz and below	15kHz、30kHz
80MHz	Over 6GHz	60kHz、120kHz

Under this embodiment, there are also cases where the network device operates at 6GHz and below and above 6GHz at the same time. When the terminal needs to receive downlink information on two carriers of 6GHz and below and 6GHz and above simultaneously. The network equipment needs to adopt different LBT bandwidths in different frequency bands; the LBT bandwidth is the same within the same carrier. And when different carriers all work at 6GHz and below, or all work at above 6GHz, different carriers all adopt a kind of LBT bandwidth.

Under the embodiment, the terminal can clearly know the LBT bandwidth adopted by the network equipment according to the signal transmission frequency and the subcarrier spacing of the network equipment. The first information is not required to indicate the LBT bandwidth information to a terminal.

Example 2

In this embodiment, the LBT bandwidth has 3 values, and corresponds to three frequency bands of the unlicensed spectrum, respectively. The bandwidth values corresponding to the three unlicensed frequency bands are A, B, C. A typical value for a is 20 MHz; typical values for B are e.g. 80MHz, 100MHz, 160MHz, etc., and typical values for C are 160MHz, 200MHz, 320MHz, etc. Similar to embodiment 1, there is a limit to the subcarrier spacing corresponding to different LBT bandwidths.

TABLE 5 example with 3 LBT bandwidths

Table 5 gives an example of using 3 LBT bandwidths. At this time A, B, C takes on 20MHz, 80MHz and 160MHz respectively. Wherein the LBT bandwidth of 20MHz is suitable for the interval of two sub-carriers of 15kHz and 30 kHz; the LBT bandwidth of 80MHz is suitable for the interval of two subcarriers of 60kHz and 120 kHz; while 160MHz is suitable for 120kHz, 240kHz subcarrier spacing.

In this embodiment, there is also a case where the network device operates at multiple frequency points simultaneously. When the terminal needs to receive different carriers distributed in different frequency ranges at the same time, different LBT bandwidths are adopted in different carriers according to the frequency ranges in table 3.

Under the embodiment, the terminal can clearly know the LBT bandwidth adopted by the network equipment according to the signal frequency sent by the network equipment. The first information is not required to indicate the first bandwidth information to a terminal.

Compared with the embodiment 1, the embodiment 2 is further divided in the frequency domain dimension, the design is more flexible, and meanwhile, the system overhead is not increased.

Example 3

In this embodiment, the LBT bandwidth has multiple values, and the one-to-one correspondence relationship between the partial frequency band and the different subcarrier intervals is no longer satisfied. The same frequency band can be suitable for various LBT bandwidths and subcarrier intervals and has suitable scenes. For the 52.6GHz-71GHz band, a large number of unauthorized frequency spectrums exist, the available bandwidths are all over 1GHz, and the maximum continuous available frequency spectrum reaches over 6 GHz. Using such a large bandwidth requires a relatively large LBT bandwidth to reduce overhead, and it is necessary to use an LBT bandwidth of 300MHz or more. The LBT bandwidth is increased, which has limitations, especially, the detection capability of the narrowband interference is reduced, and the interference is easily caused, and meanwhile, the network device adopts a large LBT bandwidth, and the power consumption of the terminal is correspondingly improved. It is also a reasonable choice to adjust the LBT bandwidth according to the actual traffic, down to a value that matches the interference and traffic requirements. In addition, different countries have some requirements for high frequency traffic blocking, such as 250MHz based, and such limitation makes LBT bandwidth need to consider matching when coexisting with other systems.

Table 6 gives an example of the frequency bands above 52.6GHz for which various LBT bandwidths may be employed for different subcarrier spacings. Wherein the 6GHz and below frequency spectrum and the 6G up to 52.6GHz correspond to LBT bandwidths of 20MHz and 80MHz respectively, and the 52.6GHz and above corresponds to 4 LBT bandwidths of 160, 250, 320 and 640MHz respectively. In this case, there are also multiple sub-carrier spacings selectable for each LBT bandwidth.

TABLE 6 example with 3 LBT bandwidths

Serial number	LBT bandwidth	Applicable frequency band	Adapted to subcarrier spacing
				1	20MHz	6GHz and below	15kHz、30kHz
2	80MHz	6G up to 52.6GHz	60kHz、120kHz
				3	160MHz	Over 52.6GHz	120kHz、240kHz
4	250MHz	Over 52.6GHz	120kHz、240kHz
				5	320MHz	Over 52.6GHz	120kHz、240kHz
6	640MHz	Over 52.6GHz	240kHz、480kHz

Under the embodiment, when the system has an unlicensed frequency band carrier above 52.6GHz, the terminal has difficulty in determining the LBT bandwidth adopted by the network device. The network equipment needs to inform the terminal of the information related to the LBT bandwidth through the sending of the first information. For an initially accessed terminal, in order to know the LBT bandwidth adopted by the network device, it needs to know in a system message containing the first information, such as an MIB or SIB message. And the network device wants to change the LBT bandwidth when the terminal accesses, the terminal device can be notified through higher layer signaling such as RRC message containing the first information.

The network device works at a plurality of frequency points simultaneously. When a terminal needs to receive different carriers distributed in different frequency ranges at the same time, there is a possibility that there are multiple LBT bandwidths for some frequency bands according to the configuration of table 6. 2 cases need to be considered:

case 1: one LBT bandwidth is used within each carrier, and different carriers may be configured with different LBT bandwidths.

In this case, for a frequency band with only one LBT bandwidth, the terminal may know the LBT bandwidth without indication. For a carrier with multiple possible LBT bandwidths, the network device needs to inform the terminal of the bandwidth value adopted by the carrier through the first information.

Case 2: multiple LBT bandwidths may be used within each carrier, and different carriers may also be configured with multiple LBT bandwidths.

In this case, for a frequency band with only one LBT bandwidth, the terminal may know the LBT bandwidth without indication. For a carrier with multiple possible LBT bandwidths, the network device needs to inform the terminal of the bandwidth value adopted by the carrier through the first information. Since there is a possibility that there are multiple LBT bandwidths in a carrier, the indication of the LBT bandwidth value needs to indicate not only the LBT bandwidth used in a carrier, such as the LBT bandwidth used in the carrier with both 320MHz and 160MHz, but also further indicate which physical resources in the carrier use the LBT bandwidth with 320MHz and which physical resources use the LBT bandwidth with 160 MHz. The bandwidth is indicated based on BWP within one carrier, i.e. the first information joining the BWP in a BWP related configuration indicates the bandwidth employed by the current BWP. The BWP configuration may be carried in system information or RRC signaling.

Compared with the embodiments 1 and 2, the embodiment 3 is more flexible in design, can realize that the same carrier supports various LBT bandwidths, dynamically adjusts the LBT strategy according to the service and interference conditions, and gives consideration to flexible bandwidth configuration and LBT overhead saving. The flexible configuration of embodiment 3 needs to be implemented by introducing the first information into the system message and the higher layer information to indicate the bandwidth value.

Fig. 3 is a flowchart of an embodiment of a method of the present application for a network device.

The network device performs an LBT procedure before transmitting the signal. According to the carrier frequency and the subcarrier interval where the network device sends signals, the LBT bandwidth may have a plurality of values, such as 80MHz, 160MHz, 320MHz, 400MHz, etc.

Step 201, the network device determines the LBT bandwidth according to the carrier frequency of the signal;

the network device may select, within the same carrier and within multiple carriers, multiple LBT bandwidths, each LBT bandwidth may be different, for example, one in-carrier network may select LBT bandwidths of 160MHz and 320MHz, and different carriers may have more LBT bandwidth choices;

further, each LBT bandwidth of the network device sending signals in the same carrier is the same, and LBT bandwidths of different carriers may be different, for example, in order to match different services, the network device uses different carriers to serve different services, and each carrier uses one LBT bandwidth.

Step 202, the network device determines the LBT bandwidth according to the subcarrier interval of the transmission signal;

the network device may transmit signals using different subcarrier spacings and may use the same LBT bandwidth, e.g., 160MHz for both 120kHz and 240kHz subcarrier spacings.

Step 203, the network device sends a first message to indicate the LBT bandwidth;

the network device may send first information to indicate the LBT bandwidth, where the first information may be included in a system message (MIB and/or SIB) or may be in a higher layer signaling (RRC message).

And step 204, the network equipment sends the downlink signal according to the LBT bandwidth.

Fig. 4 is a flowchart of an embodiment of a method of the present application for a terminal device.

301, receiving a downlink signal by a terminal device, and determining subcarrier intervals and carrier frequencies;

a terminal receives a signal sent by network equipment after LBT, and the subcarrier interval of the signal sent by the network equipment and the carrier frequency of the signal sent by the network equipment can be obtained through signal detection;

the bandwidth of the downlink signal is the LBT bandwidth.

Step 302, the terminal device determines the bandwidth of the downlink signal according to the subcarrier interval and the carrier frequency of the signal;

the terminal determines the bandwidth of the downlink signal according to the subcarrier interval of the signal sent by the network equipment and the carrier frequency of the sent signal;

as shown in the steps 101 to 103 of the present application and in the embodiments 1 to 3,

each carrier frequency corresponds to the bandwidth of the downlink signal and comprises 1 or more bandwidth values;

each subcarrier interval corresponds to the bandwidth of a downlink signal and comprises 1 or more bandwidth values;

each combination of carrier frequency and subcarrier frequency corresponds to the bandwidth of the downlink signal and comprises 1 or more bandwidth values.

If the network device and the terminal agree that only 1 LBT bandwidth corresponds to the carrier frequency, the subcarrier spacing or the combination of the carrier frequency and the subcarrier spacing, the bandwidth value is determined;

if the network device and the terminal agree that only 2 or more LBT bandwidths are corresponded to at the carrier frequency, the subcarrier spacing, or the combination of the two, the bandwidth value may be determined according to a predetermined rule or first information.

Step 303, receiving the first information, and further determining a bandwidth of the downlink signal.

If the carrier frequency and the subcarrier interval have various LBT bandwidths, the terminal determines a bandwidth value according to the first information indication;

if there are multiple LBT bandwidths at the carrier frequency and subcarrier spacing and the terminal does not receive the first information, the terminal assumes the minimum of all possible LBT bandwidths as a bandwidth value.

Fig. 5 is a schematic diagram of an embodiment of a network device.

An embodiment of the present application further provides a network device, which is used in the method according to any one of the above embodiments of the present application. The network equipment determines the LBT bandwidth and initiates an LBT process according to the signal carrier frequency and the subcarrier interval; and the network equipment also occupies the LBT bandwidth to send a downlink signal.

In order to implement the foregoing technical solution, the network device 400 provided in the present application includes a network sending module 401, a network determining module 402, and a network receiving module 403.

The network sending module is used for sending downlink physical signals such as SS/PBCH block, PDSCH and PDCCH according to LBT bandwidth; further, the network sending module is further configured to send first information indicating the LBT bandwidth; the first information may be included in system messages (MIB and/or SIB) or in higher layer signaling (RRC messages).

The network determining module is configured to determine the LBT bandwidth, where the LBT bandwidth may have multiple values according to a carrier frequency and a subcarrier interval where a network device sends a signal; according to the steps 101-102 and the methods of the embodiments 1-3, the subcarrier intervals are different, and the same LBT bandwidth can be adopted; there may be multiple LBT bandwidths within the same carrier and within multiple carriers, each of which may be different; the network module is further configured to generate first information.

And the network receiving module is used for receiving uplink data or uplink signaling.

The specific method for implementing the functions of the network sending module, the network determining module, and the network receiving module is described in the embodiments of the methods shown in fig. 1 to 4, and will not be described herein again.

Fig. 6 is a schematic diagram of an embodiment of a terminal device.

The present application further proposes a terminal device for use in the method according to any of the above embodiments of the present application. The terminal equipment determines the LBT bandwidth according to the signal carrier frequency and the subcarrier interval; and the terminal equipment also occupies the LBT bandwidth to receive the downlink signal.

In order to implement the foregoing technical solution, the terminal device 500 provided in the present application includes a terminal sending module 501, a terminal determining module 502, and a terminal receiving module 503.

The terminal receiving module is used for receiving a downlink signal sent by the network equipment; the terminal receiving module is further configured to receive the first information.

The terminal determining module is configured to determine the LBT bandwidth according to a subcarrier interval of a signal sent by the network device and a carrier frequency where the sent signal is located; for example, if the network device and the terminal agree that there is only one LBT bandwidth at the carrier frequency and subcarrier spacing, determining a bandwidth value; for another example, there are multiple LBT bandwidths under the carrier frequency and subcarrier spacing, and bandwidth values are further determined according to the first information indication; for another example, if there are multiple LBT bandwidths under the carrier frequency and subcarrier spacing and the terminal does not receive the first information, then according to a preset rule, for example, a minimum value of the corresponding multiple LBT bandwidths is selected.

And the terminal sending module is used for sending uplink data or uplink signaling.

The specific method for implementing the functions of the terminal sending module, the terminal determining module and the terminal receiving module is described in the embodiments of the methods shown in fig. 1 to 4 of the present application, and is not described herein again.

The terminal equipment can be mobile terminal equipment.

Fig. 7 is a schematic structural diagram of a network device according to another embodiment of the present invention. The network device 600 comprises a processor 601, a wireless interface 602, a memory 603. Wherein the wireless interface may be a plurality of components, i.e. including a transmitter and a receiver, providing means for communicating with various other apparatus over a transmission medium. The wireless interface implements a communication function with the terminal device, and processes wireless signals through the receiving and transmitting devices, and data carried by the signals are communicated with the memory or the processor through the internal bus structure. The memory 603 contains a computer program for executing any of the embodiments of fig. 1 to 4 of the present application, which is run or changed on the processor 601. When the memory, processor, wireless interface circuit are connected through a bus system. The bus system includes a data bus, a power bus, a control bus, and a status signal bus, which are not described herein.

Fig. 8 is a block diagram of a terminal device of another embodiment of the present invention. The terminal device 700 shown in the figure comprises at least one processor 701, a memory 702, a user interface 703 and at least one network interface 704. The various components in the terminal device 700 are coupled together by a bus system. A bus system is used to enable connection communication between these components. The bus system includes a data bus, a power bus, a control bus, and a status signal bus.

The user interface 703 may include a display, a keyboard, or a pointing device, such as a mouse, a trackball, a touch pad, or a touch screen, among others.

The memory 702 stores executable modules or data structures. The memory may have stored therein an operating system and an application program. The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs include various application programs such as a media player, a browser, and the like for implementing various application services.

In the embodiment of the present invention, the memory 702 contains a computer program for executing any one of the embodiments of fig. 1 to 4 of the present application, and the computer program runs or changes on the processor 701.

The memory 702 contains a computer readable storage medium, and the processor 701 reads the information in the memory 702 and combines the hardware to complete the steps of the above-described method. In particular, the computer-readable storage medium has stored thereon a computer program, which when executed by the processor 701 implements the steps of the method embodiment as described above with reference to any one of the embodiments of fig. 1 to 4.

The processor 701 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the method of the present application may be implemented by hardware integrated logic circuits in the processor 701 or by instructions in the form of software. The processor 701 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, an off-the-shelf programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. In a typical configuration, the device of the present application includes one or more processors (CPUs), an input/output user interface, a network interface, and a memory.

Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application therefore also proposes a computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of the embodiments of the present application. For example, the

memory

603, 702 of the present invention may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (FLASH RAM).

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory computer readable media such as modulated data signals and carrier waves.

Based on the embodiments of fig. 1 to 8, the present application further provides a mobile communication system, which includes at least 1 embodiment of any terminal device in the present application and/or at least 1 embodiment of any network device in the present application.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A listen before send transmission method is used for a 5G system and is characterized in that,

the LBT bandwidth, comprising at least 2 alternative values.

2. The method of claim 1,

in a set frequency range, the subcarrier intervals of signals are different, and the LBT bandwidths are the same;

the set frequency range is at least one of the following ranges:

≤6G，>6G，6～52.6G，≥52.6G。

3. the method of claim 1,

in a set frequency range, LBT bandwidths are different, and the subcarrier intervals of signals are the same;

the set frequency range is at least one of the following ranges:

≤6GHz，>6GHz，6～52.6GHz，≥52.6GHz。

4. the method of claim 1,

and first information is contained in a system message and/or a high-layer signaling, and the first information is used for indicating the LBT bandwidth value.

5. The method of claim 1,

the combination of the LBT bandwidth and the subcarrier spacing allows the number of available RBs to be within a preset range.

6. The method of claim 1,

the alternative values comprise at least 2 of:

20MHz、80MHz、160MHz、250MHz、320MHz、640MHz。

7. the method according to any one of claims 1 to 6,

the LBT bandwidth is determined according to the signal carrier frequency and the subcarrier interval, and the LBT bandwidth comprises at least 1 corresponding relation as follows:

8. A network device for use in the method of any one of claims 1 to 7,

the network equipment determines the LBT bandwidth and initiates an LBT process according to the signal carrier frequency and the subcarrier interval;

and the network equipment also occupies the LBT bandwidth to send a downlink signal.

9. A network device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of claims 1 to 7.

10. A terminal device for use in the method of any one of claims 1 to 7,

the terminal equipment determines the LBT bandwidth according to the signal carrier frequency and the subcarrier interval;

and the terminal equipment also occupies the LBT bandwidth to receive the downlink signal.

11. A terminal device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of claims 1 to 7.

12. A mobile communication system comprising at least one network device according to any of claims 8 to 9 and at least one terminal device according to any of claims 10 to 11.

13. A computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.